Battery device and electric device

Abstract

The battery device provided by the embodiments of the present disclosure comprises a box assembly and a plurality of battery monomers. The box assembly comprises a box body and an air cooling assembly. The box body has a first wall, and the plurality of battery monomers are carried on the first wall. The air cooling assembly is arranged on the side of the first wall away from the battery monomers, and the air cooling assembly is used to form an air cooling chamber for heat exchange with the first wall. Wherein, the box assembly is provided with a first air passage and a second air passage in communication with the air cooling chamber. The battery device provided by the embodiments of the present disclosure can improve the heat exchange effect on the battery monomers to some extent, so as to maintain the battery monomers at a suitable temperature.

Description

Technical Field

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

[0002] In electrical devices equipped with battery units, the battery unit can provide all or part of the power. During the use of the battery unit, the individual battery cells generate heat. If this heat is too high, it will adversely affect the performance and lifespan of the battery unit. Therefore, how to effectively dissipate heat from the individual battery cells has become an important research direction in this field. Utility Model Content

[0003] In view of this, the present disclosure aims to provide a battery device and an electrical device that can improve the heat exchange effect to a certain extent.

[0004] Therefore, a first aspect of this disclosure provides a battery device, the battery device including a housing assembly and a plurality of battery cells, the housing assembly including:

[0005] A housing body, the housing body having a first wall, the plurality of battery cells being supported on the first wall;

[0006] An air-cooled assembly is disposed on the side of the first wall opposite to the battery cell, and the air-cooled assembly is used to form an air-cooled chamber for heat exchange with the first wall; wherein...

[0007] The housing assembly is provided with a first air vent and a second air vent that communicate with the air-cooled chamber.

[0008] The battery device provided in this embodiment of the present disclosure has an air-cooling component disposed on the side of the first wall away from the battery cell. The air-cooling component is used to form an air-cooling chamber for heat exchange with the first wall. In this way, the heat exchange medium can flow in the air-cooling chamber through the first air outlet and the second air outlet to exchange heat with the first wall, thereby realizing heat exchange with the battery cell supported on the first wall. To a certain extent, the heat exchange effect on the battery cell can be improved so as to maintain the battery cell at a suitable temperature.

[0009] In some embodiments, the air-cooling assembly forms the air-cooling chamber between itself and the first wall.

[0010] In this way, a heat exchange medium can flow in the air-cooled chamber. The heat exchange medium flows through the first wall and exchanges heat with the first wall, thereby realizing the heat exchange between the battery cells inside the box assembly and the outside world, so as to cool or heat the battery cells.

[0011] In some embodiments, the air-cooling assembly forms the air-cooling chamber, and the air-cooling assembly is heat-exchange connected to the first wall.

[0012] In this way, a heat exchange medium can flow in the air-cooled chamber, and the heat exchange medium exchanges heat with the air-cooled components. The air-cooled components then exchange heat with the first wall, thereby realizing the heat exchange between the battery cells inside the housing assembly and the outside environment, so as to cool or heat the battery cells.

[0013] In some embodiments, the air-cooling assembly includes a protective plate and a collector. The protective plate is provided with at least a first air outlet. The collector is disposed between the protective plate and the first wall, and forms a collector cavity with the protective plate. The collector is provided with a plurality of sub-outlets, each of which connects the air-cooling chamber and the collector cavity. The first air outlet is connected to the collector cavity.

[0014] In this embodiment of the application, the current collector can be enclosed with the protective plate to form a current collection cavity. The current collector is provided with a sub-current outlet. The current collection cavity is connected to the air-cooled chamber through the sub-current outlet. The first air outlet and the second air outlet can be provided on the protective plate. The current collection cavity is connected to the outside through the first air outlet and / or the second air outlet.

[0015] In some embodiments, at least one of the current collector and the protective plate includes a first protrusion forming the current collection cavity, and the sub-flow outlet is disposed on the first protrusion.

[0016] In this embodiment, by including at least one of the current collector and the protective plate as a first protrusion, the first protrusion forms a current collection cavity. This structure is simple and easy to manufacture.

[0017] In some embodiments, the projection is along the thickness direction of the first wall onto the same projection plane, and the projection of the sub-flow outlet does not overlap with the projection of the first air outlet.

[0018] In this embodiment, the projection is directed along the thickness direction of the first wall onto the same projection plane. By setting the projection of the sub-flow port and the projection of the first air outlet to not overlap, the airflow in the collection cavity is redistributed through the sub-flow port, thereby improving the heat exchange efficiency.

[0019] In some embodiments, at least two of the sub-outlets are located on both sides of the first air outlet along a first direction, the first direction being perpendicular to the stacking direction of the battery cells;

[0020] The distance between one of the sub-flow outlets located on both sides of the first air outlet along the first direction and the first air outlet is L1, and the distance between the other sub-flow outlet and the first air outlet is L2, where 0≤L1-L2≤10mm.

[0021] In this embodiment, by setting the range of L1-L2 to 0mm-10mm, it is beneficial to improve the uniformity of heat exchange medium distribution at the sub-flow port, thereby improving the temperature uniformity of the battery cells.

[0022] In some embodiments, along the stacking direction of the battery cells, the sub-outlet is closer to the edge of the housing assembly than the first air vent.

[0023] In this embodiment, by placing the sub-flow port closer to the edge of the housing assembly than the first air outlet, it is beneficial to redistribute the heat exchange medium through the sub-flow port, so that the heat exchange medium flows as far as possible through the edge of the air-cooled chamber, thereby achieving heat exchange for the battery cells located at the edge, thus improving the heat exchange effect and the temperature uniformity of the battery device. In addition, it is also beneficial to reduce the possibility that the first air outlet is blocked by other components of the electrical device, which is conducive to increasing the air volume.

[0024] In some embodiments, the flow collector includes a flow divider and a windward section, with the sub-flow outlets distributed in the flow divider; the projection of the windward section along the axial direction of the first air outlet covers the projection of the first air outlet.

[0025] In this embodiment, a projection is made along the axial direction of the first air outlet. By covering the projection of the windward part with the projection of the first air outlet, the heat exchange medium is more evenly distributed around and redistributed from the sub-inlet. This avoids the heat exchange medium flowing directly out of the sub-inlet, thus avoiding the problem of heat exchange medium concentration. It is beneficial for the sub-inlet to redistribute the heat exchange medium, thereby improving the heat exchange effect.

[0026] In some embodiments, the flow collector further includes an exhaust port, which is distributed in the windward portion. The opening area of ​​each sub-flow port is larger than the opening area of ​​each exhaust port, and each exhaust port is disposed opposite to the first air passage or the second air passage.

[0027] The heat exchange medium flowing in from the first air inlet impacts the air-facing section, exerting a certain force on it. If the impact force on the air-facing section is too large, it may damage the connection structure of the manifold (for example, causing the manifold to separate from the protective plate), leading to the failure of the air-cooled assembly. By providing an exhaust port in the air-facing section, at least part of the heat exchange medium impacting the air-facing section can flow into the air-cooled chamber through the exhaust port, thereby relieving pressure and reducing the impact force on the air-facing section. This, in turn, helps improve the reliability of the connection structure of the manifold.

[0028] In some embodiments, the ratio of the total flow cross-sectional area of ​​the exhaust port opposite to the first air vent to the total flow cross-sectional area of ​​the first air vent is greater than or equal to one-fifth and less than or equal to one-quarter.

[0029] In this embodiment, by setting the ratio of the total cross-sectional area of ​​all exhaust ports to the total cross-sectional area of ​​all first air inlets to a range of 1 / 5-1 / 4, the heat exchange medium can be redistributed as much as possible while achieving a good pressure relief effect.

[0030] In some embodiments, the current diverter extends along a first direction, and the windward portion is located in the direction of the current diverter toward the center of the protective plate, wherein the first direction is perpendicular to the stacking direction of the battery cells; or,

[0031] The diverter is arranged around the windward section.

[0032] It is beneficial to redistribute the heat exchange medium through the sub-flow port so that the heat exchange medium flows as far as possible through the edge of the air-cooled chamber, so as to achieve heat exchange on the battery cells set at the edge, thereby improving the heat exchange effect and the temperature uniformity of the battery device.

[0033] In some embodiments, the protective plate is provided with a first air outlet and a second air outlet, the current collection component includes a first current collection component and a second current collection component, the current collection cavity includes a first current collection cavity and a second current collection cavity, the first current collection component is provided with a first sub-port, the second current collection component is provided with a second sub-port, the first current collection component and the protective plate form the first current collection cavity, the second current collection component and the protective plate form the second current collection cavity, the first current collection cavity is connected to the air-cooled chamber through the first sub-port, and the second current collection cavity is connected to the air-cooled chamber through the second sub-port.

[0034] In this embodiment, by including a first current collector and a second current collector, the arrangement of the first current collector cavity and the second current collector cavity is facilitated, and the structure of the current collector is simplified, thereby improving manufacturing efficiency.

[0035] In some embodiments, the first current collector and the second current collector are located at opposite ends of the protective plate along a second direction, which is parallel to the stacking direction of the battery cells.

[0036] In this embodiment, by placing the first and second collectors at opposite ends of the protective plate along the second direction, it is beneficial to reduce the turbulence of the heat exchange medium during the flow process and improve the heat exchange efficiency. In addition, it is also beneficial to increase the contact area between the heat exchange medium and the first wall, further improving the heat exchange efficiency.

[0037] In some embodiments, the first current collector and the second current collector are symmetrical.

[0038] In this embodiment, by setting the first current collector and the second current collector as symmetrical components, the versatility of the current collector is improved, and there is no need to set a foolproof structure, thereby improving assembly efficiency.

[0039] In some embodiments, the flow collecting cavity includes a first flow collecting cavity and a second flow collecting cavity, and the flow collecting element includes a first region and a second region. The first region and the protective plate form the first flow collecting cavity, and the second region and the protective plate form the second flow collecting cavity. A spacer is provided between the first region and the second region, and the spacer abuts against the protective plate.

[0040] In this embodiment, the current collector is provided with a spacer to separate the first area and the second area, so that the first current collector cavity and the second current collector cavity are not connected. The first current collector cavity and the second current collector cavity are formed by one current collector at the same time, which helps to reduce the number of parts, reduce costs, and improve assembly efficiency.

[0041] In some embodiments, the second region is disposed around the first region.

[0042] In some embodiments, each of the battery cells has a pressure relief section, and each of the battery cells is arranged such that the pressure relief section faces the first wall. The first wall is provided with a plurality of pressure relief structures that are projected onto the same projection plane along the thickness direction of the first wall. The projection of each pressure relief section is located within the projection of the corresponding pressure relief structure.

[0043] In this embodiment, since the projection of each pressure relief section is located within the projection of the corresponding pressure relief structure, the pressure relief airflow ejected from the pressure relief section passes through the first wall via the pressure relief structure, making it less likely to impact the first wall or the structure on it, and thus timely discharges from the containment cavity to protect other battery cells, housing assemblies and other components therein.

[0044] In some embodiments, the air-cooled chamber includes an air-cooled flow channel and a pressure relief chamber, the pressure relief chamber being correspondingly arranged with the pressure relief structure, and the air-cooled flow channel being connected to both the first air outlet and the second air outlet.

[0045] The pressure relief chamber can be connected to the outside to release the pressure relief airflow, or it can be relatively closed off, with a protective plate absorbing the impact. Alternatively, when it is necessary to release pressure relief airflow, the pressure relief chamber can be connected to the external environment.

[0046] An air-cooled flow channel is formed in the air-cooled chamber. The air-cooled flow channel is connected to both the first air outlet and the second air outlet. When necessary, the pressure relief chamber is connected to the air-cooled flow channel. The pressure relief airflow in the pressure relief chamber is discharged to the air-cooled flow channel and then discharged to the external environment through the first air outlet and / or the second air outlet.

[0047] In some embodiments, the pressure relief chamber is arranged adjacent to the air-cooled flow channel.

[0048] This compact structure makes full use of the space inside the air-cooled chamber. Under normal use, the heat exchange between the battery cells can be achieved through the air-cooled flow channel. In cases such as when the pressure relief section emits pressure relief airflow, the pressure relief chamber can be connected to the external environment through the air-cooled flow channel to release the pressure relief airflow.

[0049] In some embodiments, the pressure relief chamber extends along a second direction parallel to the stacking direction of the battery cells.

[0050] In this way, one pressure relief chamber can correspond to one battery cell, one pressure relief chamber can correspond to multiple battery cells, or one pressure relief chamber can correspond to a group of battery cells.

[0051] In some embodiments, the battery device further includes a heat-absorbing component disposed in the air-cooled chamber and disposed opposite to the pressure relief portion of the battery cell in the air-cooled component.

[0052] The technical solution of this application embodiment, by setting a heat-absorbing component, is arranged relative to the pressure relief part. The pressure relief gas generated by the pressure relief part can be effectively conducted to the heat-absorbing component. On the one hand, the heat-absorbing component can absorb heat, thereby reducing the risk of battery cells running out of control due to high temperature. On the other hand, the heat-absorbing component can also block the impact of pressure relief gas, reduce the adverse effects of pressure relief gas on other components, and improve the reliability of the battery device.

[0053] In some embodiments, the heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

[0054] The technical solution of this application embodiment, by setting a phase change layer, the phase change material of the phase change layer can absorb or release heat, and the phase change temperature of the phase change layer is set within a suitable range. The phase change layer absorbs heat to reduce the possibility of thermal runaway of the battery cell, and releases heat to reduce the possibility of low-temperature failure of the battery cell, so as to provide a suitable temperature environment for the battery cell. In addition, the heat-absorbing component containing the phase change layer can also effectively block the impact of the depressurized gas on other components by absorbing the heat of the depressurized gas.

[0055] In some embodiments, the heat-absorbing component further includes a heat-conducting layer, which is stacked with the phase change layer, and the heat-conducting layer is located at least on the side of the phase change layer closest to the pressure relief portion along the stacking direction.

[0056] The technical solution of this application embodiment, by setting a heat-conducting layer, the heat-conducting layer between the pressure relief part and the phase change layer can improve the heat transfer efficiency between the two, improve the temperature regulation capability of the heat absorption component, and thus improve the reliability of the battery device.

[0057] In some embodiments, a partition is provided between the first wall and the air-cooling assembly, the partition abutting against the first wall and the air-cooling assembly respectively to define a pressure relief chamber, and the heat-absorbing assembly is located in the pressure relief chamber;

[0058] The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber to the first air vent and / or the second air vent.

[0059] The technical solution of this application embodiment, by setting a separator, facilitates the definition of the pressure relief chamber, so as to maintain the seal of the pressure relief chamber relative to the external environment. The separator can also break under the action of the pressure relief airflow ejected from the pressure relief section, so that the pressure relief airflow enters the air-cooling channel and is discharged to the external environment through the first air outlet and / or the second air outlet, thereby improving the reliability of the battery device.

[0060] In some embodiments, the housing assembly further includes a partition located between the first wall and the air-cooling assembly, and abutting against the first wall and the air-cooling assembly, thereby defining the pressure relief chamber and the air-cooling flow channel;

[0061] The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber to the first air vent and / or the second air vent.

[0062] In this embodiment, by setting a separator to define the pressure relief chamber and the air-cooled flow channel, targeted heat exchange can be achieved, which is beneficial to improving heat exchange efficiency. It can also reduce turbulence, increase flow velocity, and further improve heat exchange efficiency.

[0063] In some embodiments, the separator includes a first wall and a second wall disposed opposite to each other, the first wall forming the cavity wall of the air-cooled flow channel, and the second wall forming at least a portion of the intermediate cavity wall of the pressure relief cavity.

[0064] In other words, the pressure relief chamber and the air-cooled flow channel are located on both sides of the partition, so that the first wall surface of the partition facing the air-cooled flow channel forms the cavity wall of the air-cooled flow channel, and the second wall surface of the partition facing the pressure relief chamber forms the cavity wall of the pressure relief chamber.

[0065] In some embodiments, the separator at least defines the cavity wall between the first wall and the protective plate where the pressure relief chamber is located.

[0066] By setting a separator and defining the pressure relief chamber as being located between the first wall and the protective plate, the structure is simple and conducive to improving assembly efficiency.

[0067] In some embodiments, the air-cooled flow channel is defined between two adjacent separators.

[0068] In some embodiments, the separator includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in sequence. The first sidewall and the third sidewall are disposed opposite each other along a first direction, and the second sidewall and the fourth sidewall are disposed opposite each other along a second direction. The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall form the intermediate cavity wall of the pressure relief chamber located between the first wall and the protective plate. The first direction and the second direction are perpendicular to the thickness direction of the protective plate.

[0069] In this embodiment, by setting the separator to include a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in sequence, the structure is simple and facilitates the formation of the pressure relief chamber.

[0070] In some embodiments, the wall thickness of at least one of the first sidewall and the third sidewall is less than the wall thickness of the second sidewall and the fourth sidewall.

[0071] In this embodiment, a weakened region is formed by making the wall thickness of at least one of the first and third sidewalls smaller than the wall thicknesses of the second and fourth sidewalls, thereby achieving directional pressure relief of the battery device.

[0072] In some embodiments, the pressure relief structure extends along the second direction, and the second sidewall and the fourth sidewall are respectively disposed on both sides of the pressure relief structure along the first direction.

[0073] That is, the second and fourth sidewalls also extend along the second direction, and the first and third sidewalls extend along the first direction, so that the second and fourth sidewalls are respectively located on both sides of the pressure relief structure along the first direction, and the first and third sidewalls are respectively located on both sides of the pressure relief structure along the second direction.

[0074] In some embodiments, a boss structure is provided in the air-cooled cavity, the boss structure protruding from the air-cooled assembly toward the battery cell side, and the top wall of the boss structure forms the cavity wall of the air-cooled flow channel.

[0075] In this embodiment, the air-cooled component, by setting a boss structure, helps to reduce the cross-sectional area of ​​the air-cooled flow channel and increase the flow rate of the heat exchange medium, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell to be discharged in time, which helps to reduce the impact on other battery cells and thus reduce the chain reaction of thermal runaway of the battery cell. In addition, it also helps to improve the structural strength of the protective plate.

[0076] In some embodiments, the boss structure is located between two adjacent spacers.

[0077] In this embodiment, the air-cooled component has a boss structure, and at least part of the boss structure is located between two adjacent partitions. This helps to reduce the cross-sectional area of ​​the air-cooled flow channel and increase the flow rate of the heat exchange medium, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell to be discharged in time, which helps to reduce the impact on other battery cells and thus reduce the chain reaction of thermal runaway of the battery cell. In addition, it also helps to improve the structural strength of the protective plate.

[0078] In some embodiments, a boss structure is provided in the air-cooled chamber, the boss structure protruding from the air-cooled assembly toward the battery cell side.

[0079] In this embodiment, the air-cooled component, by setting a boss structure, helps to reduce the cross-sectional area of ​​the air-cooled flow channel and increase the flow rate of the heat exchange medium, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell to be discharged in time, which helps to reduce the impact on other battery cells and thus reduce the chain reaction of thermal runaway of the battery cell. In addition, it also helps to improve the structural strength of the protective plate.

[0080] In some embodiments, multiple battery cells are stacked to form a battery cell group, and the boss structure is located at the bottom of the battery cell group and extends along the stacking direction.

[0081] In this embodiment, by setting the boss structure at the bottom of the battery cell assembly, it is beneficial to reduce the cross-sectional area of ​​the air-cooled flow channel at the bottom of the battery cell assembly, thereby increasing the flow rate of the heat exchange medium at the bottom of the battery cell assembly and thus improving the heat exchange efficiency of the battery cell assembly.

[0082] In some embodiments, the air-cooling assembly has a protrusion on the side facing the battery cell, and the protrusion structure is the protrusion.

[0083] For example, the protective plate is recessed on the side away from the battery cell to form a groove, so that the protective plate protrudes towards the battery cell to form a boss structure, that is, the boss structure protrudes from the air-cooling assembly towards the battery cell side.

[0084] Of course, the protective plate can also be thickened to form a bulge on the side facing the battery cell.

[0085] In some embodiments, the distance between the top wall of the boss structure facing the battery cell and the first wall is 5mm-10mm.

[0086] In this embodiment, by setting the distance between the top wall of the boss structure facing the battery cell side and the first wall to 5mm-10mm, it is beneficial to ensure that the fluid has a certain flow velocity and a certain flow rate between the boss structure and the first wall, thereby further improving the cooling efficiency and exhaust efficiency.

[0087] In some embodiments, the protrusion of the boss structure from the air-cooling assembly toward the battery cell side is 5mm-10mm.

[0088] In this embodiment, by setting the protrusion of the boss structure from the air-cooling assembly toward the battery cell side to 5mm-10mm, the protective plate can have sufficient structural strength and impact resistance, while also allowing for a certain gap between the boss structure and the housing body, thereby improving cooling efficiency and exhaust efficiency.

[0089] In some embodiments, the protective panel comprises a fiber-reinforced composite laminate structure.

[0090] The technical solution of this application embodiment provides a protective plate formed by fiber-reinforced composite material layers, which has good structural strength and can also provide heat insulation, corrosion resistance and other properties according to auxiliary materials.

[0091] In some embodiments, the current collector comprises a fiber-reinforced composite laminate structure; and / or,

[0092] The current collector includes a metal component.

[0093] In this embodiment, the current collector is a laminated structure made of fiber-reinforced composite material layers. The current collector may include one or more fiber-reinforced composite material layers.

[0094] This allows the current collector to have a certain structural strength.

[0095] In some embodiments, the protective plate is sealed to the box body.

[0096] The technical solution of this application embodiment isolates the pressure relief chamber and other cavities from the external environment by sealing the protective plate with the box body, or limits the space of the air-cooled chamber and the collection chamber, so as to maintain the integrity of the flow channel of the heat exchange medium / pressure relief airflow and reduce the possibility of air leakage.

[0097] In some embodiments, the box body comprises a fiber-reinforced composite laminate structure.

[0098] The technical solution of this application embodiment provides that the box body formed by the fiber-reinforced composite material layer has good structural strength, and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials.

[0099] A second aspect of this disclosure provides an electrical device including the battery device described above.

[0100] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0101] Figure 1 This is a schematic diagram of the structure of an electrical device provided in an embodiment of the present disclosure;

[0102] Figure 2 This is an exploded perspective view of a battery device provided in an embodiment of the present disclosure;

[0103] Figure 3 This is a schematic diagram of the structure of an air-cooled component provided in an embodiment of the present disclosure;

[0104] Figure 4 This is a schematic diagram of the structure of an air-cooled component provided in an embodiment of the present disclosure;

[0105] Figure 5 This is a partial cross-sectional view of a battery device provided in an embodiment of this disclosure, with the cross-sectional direction being parallel to... Figure 4 The directions of AA shown are the same;

[0106] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0107] Figure 7 This is a schematic diagram of the structure of a protective plate provided in one embodiment of the present disclosure;

[0108] Figure 8 This is an exploded perspective view of a battery device provided in an embodiment of the present disclosure;

[0109] Figure 9 This is a schematic diagram of the structure of the housing of an electrical device provided in an embodiment of the present disclosure;

[0110] Figure 10 An exploded perspective view of an air-cooled component provided in an embodiment of this disclosure;

[0111] Figure 11 This is a partial cross-sectional view of a battery device provided in an embodiment of the present disclosure;

[0112] Figure 12 for Figure 11 Enlarged view of point C in the middle;

[0113] Figure 13 This is a schematic diagram of the heat-absorbing component in the battery device provided in the embodiments of this application.

[0114] Explanation of reference numerals in the attached figures

[0115] 10. Battery cell assembly; 12. Battery cell; 121. Pressure relief section; 20. Box body; 21. First box section; 22. Second box section; 23. First wall; 231. Pressure relief structure; 30. Air-cooled assembly; 31. Protective plate; 311. First air vent; 312. Second air vent; 313. Boss structure; 314. Main body; 315. Flanged structure; 32. Current collector; 321. First current collector; 322. Second current collector; 323. Current collector cavity; 324. First zone; 325. Second zone; 326. Windward side 3261, Exhaust port; 327, Diverter section; 328, Spacing section; 329, Sub-flow port; 40, Air-cooled chamber; 41, Air-cooled flow channel; 42, Pressure relief chamber; 50, Separator; 51, First sidewall; 52, Second sidewall; 53, Third sidewall; 54, Fourth sidewall; 60, Protective membrane; 70, Heat absorption assembly; 71, Phase change layer; 72, Thermal conductive layer; 100, Battery device; 1000, Electrical device; 1100, Cabin shell; 1110, First passage; 1120, Second passage; 1130, Guide component. Detailed Implementation

[0116] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0117] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0118] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0119] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0120] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this disclosure does not limit it.

[0121] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0122] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0123] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0124] In some implementations, the electrode assembly is a stacked structure.

[0125] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0126] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0127] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0128] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0129] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0130] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0131] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0132] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0133] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0134] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0135] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0136] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0137] During the use of battery devices, the individual battery cells generate heat. The temperature uniformity of these cells is poor, and excessive heat can adversely affect the performance and lifespan of the battery device. Therefore, effectively dissipating heat from the battery cells has become an important research direction in this field.

[0138] Therefore, in order to improve the heat exchange effect of the battery device, this disclosure provides a battery device including a housing assembly and a plurality of battery cells. The housing assembly includes a housing body and an air-cooling assembly. The housing body has a first wall, on which the plurality of battery cells are supported. The air-cooling assembly is disposed on the side of the first wall away from the battery cells, and the air-cooling assembly is used to form an air-cooled chamber for heat exchange with the first wall. The housing assembly is provided with a first air vent and a second air vent communicating with the air-cooled chamber.

[0139] The battery device provided in this embodiment of the present disclosure has an air-cooling component disposed on the side of the first wall away from the battery cell. The air-cooling component is used to form an air-cooling chamber for heat exchange with the first wall. In this way, the heat exchange medium can flow in the air-cooling chamber through the first air outlet and the second air outlet to exchange heat with the first wall, thereby realizing heat exchange with the battery cell supported on the first wall. To a certain extent, the heat exchange effect on the battery cell can be improved so as to maintain the battery cell at a suitable temperature.

[0140] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical device includes the battery device according to any embodiment of this disclosure, and the battery device is used to provide electrical energy.

[0141] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical devices.

[0142] For example, the electrical device includes an aircraft.

[0143] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0144] Reference Figure 1 An aircraft typically includes an airframe (including a cabin shell 1100) and a battery unit 100 (including a housing assembly) disposed on the airframe and providing electrical power to the airframe.

[0145] Please see Figure 2 and Figure 8To meet different power demands, the battery device 100 includes a battery cell group 10, which may include multiple battery cells 12. A battery cell 12 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 12 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 12 are connected in both series and parallel connections. Multiple battery cells 12 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 12 is housed within a housing assembly. Alternatively, the battery device 100 can also be composed of multiple battery cells 12 first connected in series, parallel, or in a mixed configuration to form battery device 100 modules, and then these modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within a housing assembly. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 12. Each battery cell 12 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 12 can be cylindrical, flat, cuboid, or other shapes.

[0146] Please see Figures 2 to 13 This disclosure provides a battery device 100, which includes a housing assembly and a plurality of battery cells 12. The housing assembly includes a housing body 20 and an air-cooling assembly 30. The housing body 20 has a first wall 23, on which the plurality of battery cells 12 are supported. The air-cooling assembly 30 is disposed on the side of the first wall 23 away from the battery cells 12, and the air-cooling assembly 30 is used to form an air-cooled chamber 40 for heat exchange with the first wall 23. The housing assembly is provided with a first air vent 311 and a second air vent 312 communicating with the air-cooled chamber 40.

[0147] Please refer to Figure 2 The housing assembly includes a housing body 20, which has an internal cavity, and the battery cell 12 is disposed in the cavity of the housing body 20.

[0148] For example, the box body 20 may include a first box portion 21 and a second box portion 22, which surround and form a receiving cavity.

[0149] For example, the first wall 23 may be the bottom wall of the receiving cavity.

[0150] The box body 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0151] The box body 20 is used to install the battery cell 12. The box body 20 can carry the battery cell 12. The battery cell 12 is installed on the electrical device 1000 through the box assembly.

[0152] For example, the enclosure assembly is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the enclosure assembly is parallel to the longest side of its cuboid structure. The height direction of the enclosure assembly is perpendicular to the ground. For example, as... Figure 2 As shown, the length direction of the enclosure assembly is the first direction, and the width direction of the enclosure assembly is the second direction; or the length direction of the enclosure is the second direction, and the width direction of the enclosure assembly is the first direction. The height direction of the enclosure assembly is the third direction.

[0153] Here, there are multiple ways in which the air-cooled component 30 is used to form the air-cooled chamber 40.

[0154] In some embodiments, an air-cooled chamber 40 is formed between the air-cooled component 30 and the first wall 23. In other words, both the air-cooled component 30 and the first wall 23 constitute the cavity wall of the air-cooled chamber 40.

[0155] Thus, a heat exchange medium can flow inside the air-cooled chamber 40. The heat exchange medium flows through the first wall 23 and exchanges heat with the first wall 23, thereby realizing the heat exchange between the battery cell 12 inside the box assembly and the outside world, so as to cool or heat the battery cell 12.

[0156] In other embodiments, the air-cooled assembly 30 forms an air-cooled chamber 40, and the air-cooled assembly 30 is heat-exchange connected to the first wall 23. In other words, the air-cooled assembly 30 forms an air-cooled chamber 40 inside.

[0157] In this way, a heat exchange medium can flow in the air-cooled chamber 40, and the heat exchange medium exchanges heat with the air-cooled component 30. The air-cooled component 30 then exchanges heat with the first wall 23, thereby realizing the heat exchange between the battery cell 12 inside the housing assembly and the outside world, so as to cool or heat the battery cell 12.

[0158] The heat exchange medium can be a gaseous medium or a liquid medium. For example, the first air outlet 311 and the second air outlet 312 are connected to an air conditioning system, a liquid cooling system, a fan device, etc.

[0159] For example, the first air vent 311 and the second air vent 312 can also be directly connected to the outside of the electrical equipment, for example, the electrical equipment is an aircraft, and the heat exchange medium is the airflow generated during the flight of the aircraft. The airflow generated by the flight of the aircraft is used to cool down the battery cell 12. The airflow has a high velocity, which facilitates the cooling of the battery cell 12 and simplifies the heat exchange structure, which helps to achieve the lightweighting of the aircraft.

[0160] For example, the aircraft can also direct natural airflow to the air-cooled chamber 40 through ducts within the cabin.

[0161] Here, due to the strong convection characteristics of the aircraft during flight, it is beneficial to further improve the heat exchange effect on the battery cell 12.

[0162] Of course, in embodiments where the electrical device 1000 is a vehicle or the like, the battery cell 12 can also be cooled by natural wind.

[0163] For example, the first air vent 311 and the second air vent 312 may have the same or different structures; the first air vent 311 and the second air vent 312 may have the same or different sizes; the number of first air vents 311 and the second air vent 312 may be the same or different. In some examples, the first air vents 311 and the second air vents 312 are provided in a one-to-one correspondence.

[0164] The first air vent 311 and the second air vent 312 can be arranged in various possible forms. For some embodiments, please refer to... Figure 7 The first air vent 311 and the second air vent 312 are respectively disposed on different sides of the air-cooled assembly 30. For example, the first air vent 311 and the second air vent 312 are disposed on opposite sides of the air-cooled assembly 30 along a first direction or a second direction.

[0165] In other examples, please refer to Figure 10 One of the first air vent 311 and the second air vent 312 is disposed in the middle of the air-cooled component 30, and the other of the first air vent 311 and the second air vent 312 is disposed at the edge of the air-cooled component 30. For example, a plurality of first air vents 311 are arrayed in the middle of the air-cooled component 30, and a plurality of second air vents 312 are arranged around the edge of the air-cooled component 30.

[0166] For example, please refer to Figure 8 and Figure 13 The first wall 23 is provided with a pressure relief structure 231, which is connected to the air-cooled chamber 40.

[0167] The high-temperature fluid generated by thermal runaway of the battery device 100 can flow from the box body 20 into the air-cooled chamber 40 through the pressure relief structure 231, and then be discharged through the first vent and / or the second vent.

[0168] Here, the heat exchange medium can flow into the air-cooled chamber 40 through the first air outlet 311 and then flow out to the outside of the electrical equipment through the second air outlet 312, or it can flow into the air-cooled chamber 40 through the second air outlet 312 and then flow out to the outside of the electrical equipment through the first air outlet 311.

[0169] The battery device 100 provided in this embodiment of the present disclosure has an air-cooling component 30 provided on the side of the first wall 23 away from the battery cell 12. The air-cooling component 30 is used to form an air-cooling chamber 40 for heat exchange with the first wall 23. In this way, the heat exchange medium can flow in the air-cooling chamber 40 through the first air outlet 311 and the second air outlet 312 to exchange heat with the first wall 23, thereby realizing heat exchange with the battery cell 12 supported on the first wall 23. To a certain extent, the heat exchange effect of the battery cell 12 can be improved so as to maintain the battery cell 12 at a suitable temperature.

[0170] In some embodiments, please refer to Figures 4 to 7 The air-cooled assembly 30 includes a protective plate 31 and a collector 32. The protective plate 31 has at least a first air inlet 311. The collector 32 is disposed between the protective plate 31 and the first wall 23, forming a collector cavity 323 between the collector and the protective plate 31. The collector 32 has multiple sub-outlets 329, each sub-outlet 329 connecting the ventilation and cooling chamber 40 and the collector cavity 323. The first air inlet 311 communicates with the collector cavity 323.

[0171] Here, the air-cooled assembly 30 may include one or more components.

[0172] In this disclosure, "multiple" refers to two or more items.

[0173] For example, please refer to Figure 3 and Figure 4 The air-cooled component 30 includes a protective plate 31, which is connected to the housing body 20 and encloses the housing body 20 to form an accommodating space. At least a portion of the accommodating space forms an air-cooled chamber 40.

[0174] The protective plate 31 has a plate-like structure. For example, the protective plate 31 may be a bottom protective plate.

[0175] For example, please refer to Figure 3 and Figure 4 The air-cooled assembly 30 also includes a manifold 32, which is disposed in the receiving cavity. In other words, the manifold 32 is disposed between the protective plate 31 and the first wall 23.

[0176] The manifold 32 can be connected to at least one of the protective plate 31 and the housing assembly.

[0177] In some examples, the manifold 32 is connected to the protective plate 31, a part of the protective plate 31 forms an air-cooled chamber 40 with the manifold 32 and the box body 20, and another part of the protective plate 31 forms a manifold cavity 323 with the manifold 32.

[0178] In this embodiment, the current collector 32 can be enclosed with the protective plate 31 to form a current collector cavity 323. The current collector 32 is provided with a sub-flow port 329. The current collector cavity 323 is connected to the air-cooled chamber 40 through the sub-flow port 329. The first air outlet 311 and the second air outlet 312 can be provided on the protective plate 31. The current collector cavity 323 is connected to the outside through the first air outlet 311 and / or the second air outlet 312.

[0179] In one example, see Figure 8 and Figure 9 The aircraft includes a cabin shell 1100, which has a connecting hole. The air-cooling component 30 is connected to the cabin shell 1100, and the first air vent 311 / second air vent 312 are connected to the external environment through the connecting hole of the cabin shell 1100.

[0180] In this embodiment, the collector 32 can be provided with multiple sub-ports 329, which correspond to different positions of the first wall 23. That is, the heat exchange medium in the collector cavity 323 can be distributed to different positions of the first wall 23 through the multiple sub-ports 329, thereby realizing the distribution of the heat exchange medium. For example, more heat exchange medium is distributed to positions with more heat, such as the battery cell 12, and less heat exchange medium is distributed to the gaps between the battery cell groups 10.

[0181] Here, the heat exchange medium can be distributed according to the temperature difference in different areas of the battery cell 12 by coordinating the current collector 323 and the sub-port 329. For example, the flow rate of the heat exchange medium is increased in the area of ​​the battery cell 12 with a higher temperature, and the flow rate of the heat exchange medium is reduced in the area of ​​the battery cell 12 with a lower temperature, thereby improving the temperature uniformity of the battery cell 12.

[0182] In some embodiments, please refer to Figures 3 to 5 At least one of the current collector 32 and the protective plate 31 includes a first protrusion, the first protrusion forming a current collector cavity 323, and a sub-flow outlet 329 is disposed on the first protrusion.

[0183] Here, the first protrusion can be provided on the current collector 32 or on the protective plate 31.

[0184] For example, the current collector 32 may be plate-shaped.

[0185] Taking the current collector 32 as an example, the current collector 32 is recessed on the side facing the protective plate 31 to form a groove, so that the current collector 32 protrudes in the direction facing the receiving cavity to form the first protrusion.

[0186] The first protrusion forming a flow collection cavity 323 means that a flow collection cavity 323 is formed between the groove wall and the protective plate 31.

[0187] For example, the current collector 32 also includes a connecting edge connected to the periphery of the first protrusion, and the current collector 32 is connected to the protective plate 31 through the connecting edge.

[0188] For example, the connection between the connecting edge and the protective plate 31 can be an adhesive connection, a welded connection, a fastening connection, and / or a snap-fit ​​connection.

[0189] For example, the material of the current collector 32 can be sheet metal, composite material, plastic, etc.

[0190] Sub-flow port 329 is provided on the first protrusion so that sub-flow port 329 is connected to the collection cavity 323.

[0191] In this embodiment, by including at least one of the current collector 32 and the protective plate 31 with a first protrusion, the first protrusion forms a current collector cavity 323. This structure is simple and easy to manufacture.

[0192] In some embodiments, please refer to Figures 3 to 4 The projection of the sub-flow port 329 onto the same projection plane along the thickness direction of the first wall 23 does not overlap with the projection of the first air outlet 311.

[0193] In other words, at least some of the sub-flow ports 329 are not directly opposite the first air inlet 311.

[0194] Of course, the projection of the sub-outlet 329 does not overlap with the projection of the second air outlet 312.

[0195] For example, when projected onto the same projection plane along the thickness direction of the first wall 23, the projection of the sub-flow port 329 and the projection of the first air passage port 311 may not completely overlap, that is, at least part of the projection of the sub-flow port 329 is located outside the projection of the first air passage port 311.

[0196] For example, when projected onto the same projection plane along the thickness direction of the first wall 23, the projection of the sub-flow port 329 and the projection of the first air outlet 311 may not overlap at all.

[0197] In this embodiment, the projection is directed along the thickness direction of the first wall 23 onto the same projection plane. By setting the projection of the sub-flow port 329 and the projection of the first air outlet 311 to not overlap, the airflow of the collection cavity 323 is redistributed through the sub-flow port 329, thereby improving the heat exchange efficiency.

[0198] In some embodiments, please refer to Figure 3At least two sub-ports 329 are located on both sides of the first air vent 311 along a first direction, which is perpendicular to the stacking direction of the battery cells 12. One of the sub-ports 329 located on both sides of the first air vent 311 along the first direction is at a distance L1 from the first air vent 311, and the other sub-port 329 is at a distance L2 from the first air vent 311, where 0≤L1-L2≤10mm.

[0199] For example, the battery device 100 includes a battery cell group 10, wherein the individual battery cells 12 constituting the battery cell group 10 are stacked to form the battery cell group 10, and the stacking direction of the individual battery cells 12 is the stacking direction of the battery cell group 10.

[0200] For example, at least some of the sub-ports 329 are arranged along the first direction, and multiple battery cell groups 10 are spaced apart along the first direction, with at least one sub-port 329 corresponding to the gap between adjacent battery cell groups 10.

[0201] Projecting along the stacking direction of the battery cells 12 onto the same projection plane, at least one sub-outlet 329 is located in the gap between adjacent battery cell groups 10.

[0202] Here, L1-L2 refers to the difference in distance between the two sub-flow outlets 329 and the first air outlet 311. The smaller the value of L1-L2, the smaller the difference in distance between the two sub-flow outlets 329 and the first air outlet 311. The larger the value of L1-L2, the greater the difference in distance between the two sub-flow outlets 329 and the first air outlet 311. When L1-L2 equals 0, it means that the distance between the two sub-flow outlets 329 and the first air outlet 311 is the same.

[0203] L1-L2 can be any one of 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or any point value between two of them.

[0204] In this embodiment, by setting the range of L1-L2 to 0mm-10mm, it is beneficial to improve the uniformity of heat exchange medium distribution by the sub-flow port 329, thereby improving the temperature uniformity of the battery cell 12.

[0205] In some embodiments, please refer to Figures 3 to 4 Along the stacking direction of the battery cells 12, the sub-outlet 329 is closer to the edge of the housing assembly than the first air outlet 311.

[0206] In other words, the distance from the center of the sub-flow port 329 to the edge of the housing assembly is less than the distance from the center of the first air outlet 311 to the edge of the housing assembly, or the distance from the edge of the sub-flow port 329 to the edge of the housing assembly is less than the distance from the edge of the first air outlet 311 to the edge of the housing assembly. This facilitates the redistribution of the heat exchange medium through the sub-flow port 329, so that the heat exchange medium flows as far as possible through the edge of the air-cooled chamber 40, thereby achieving heat exchange for the battery cells 12 located at the edge.

[0207] Furthermore, since the battery device 100 is assembled to the power-consuming device 1000, the edge of the battery device 100 may be blocked by other components of the power-consuming device 1000. If the first air vent 311 is located too close to the edge of the battery device 100 (i.e. the edge of the housing assembly), it may be blocked by other components of the power-consuming device 1000. Therefore, by setting the sub-air vent 329 near the edge of the housing assembly, it is beneficial to improve the air volume.

[0208] In this embodiment, by placing the sub-flow port 329 closer to the edge of the housing assembly than the first air outlet 311, it is beneficial to redistribute the heat exchange medium through the sub-flow port 329 so that the heat exchange medium flows as far as possible through the edge of the air-cooled chamber 40, thereby achieving heat exchange with the battery cells 12 located at the edge, thus improving the heat exchange effect and the temperature uniformity of the battery device 100. In addition, it is beneficial to reduce the possibility that the first air outlet 311 will be blocked by other components of the electrical device 1000, which is beneficial to increasing the air volume.

[0209] In some embodiments, please refer to Figure 4 and Figure 10 The flow collector 32 includes a flow divider 327 and a windward section 326, with sub-flow outlets 329 distributed in the flow divider 327. Projecting along the axial direction of the first air outlet 311, the projection of the windward section 326 covers the projection of the first air outlet 311.

[0210] Here, the projection along the axial direction of the first air inlet 311 is made, and the projection of the windward part 326 covers the projection of the first air inlet 311. That is to say, the heat exchange medium flowing in from the first air inlet 311 will impact the windward part 326, and then be evenly distributed to the surrounding area, and redistributed from the sub-inlet 329.

[0211] For example, the number of windward sections 326 can be one or more.

[0212] In this embodiment, a projection is made along the axial direction of the first air outlet 311. By covering the projection of the first air outlet 311 with the projection of the windward part 326, the heat exchange medium is more evenly distributed around and redistributed from the sub-outlet 329. This avoids the heat exchange medium flowing directly out of the sub-outlet 329, thus avoiding the problem of heat exchange medium concentration. It is beneficial for the sub-outlet 329 to redistribute the heat exchange medium, thereby improving the heat exchange effect.

[0213] In some embodiments, please refer to Figure 4 and Figure 7 The windward section 326 is a panel that is perpendicular to the axis of the first air vent 311.

[0214] In other words, the windward section 326 is perpendicular to the axis of the first air passage 311.

[0215] This further facilitates a more uniform distribution of the heat exchange medium around the perimeter and its redistribution from the sub-port 329.

[0216] In some embodiments, please refer to Figures 3 to 4 The flow collector 32 also includes an exhaust port 3261, which is distributed in the windward part 326. The opening area of ​​each sub-flow port 329 is larger than the opening area of ​​each exhaust port 3261. Each exhaust port 3261 is arranged opposite to the first air passage 311 or the second air passage 312.

[0217] It is understandable that the heat exchange medium flowing in from the first air inlet 311 will impact the air intake 326, thus exerting a certain force on it. If the impact force on the air intake 326 is too large, it may damage the connection structure of the manifold 32 (for example, causing the manifold 32 to separate from the protective plate 31), thereby leading to the failure of the air-cooled assembly 30. By providing an exhaust port 3261 in the air intake 326, at least part of the heat exchange medium impacting the air intake 326 can flow into the air-cooled chamber 40 through the exhaust port 3261, thereby relieving pressure and reducing the impact force on the air intake 326, which in turn helps to improve the reliability of the connection structure of the manifold 32.

[0218] The opening area of ​​each sub-flow port 329 is larger than the opening area of ​​each exhaust port 3261, so that the exhaust port 3261 can release pressure and the sub-flow port 329 can divert the flow.

[0219] In some embodiments, please refer to Figure 4 and Figure 7 The ratio of the total cross-sectional area of ​​the exhaust port 3261, which is disposed opposite to the first air inlet 311, to the total cross-sectional area of ​​the first air inlet 311 is greater than or equal to one-fifth and less than or equal to one-quarter.

[0220] Here, if the ratio of the total flow cross-sectional area of ​​all exhaust ports 3261 to the total flow cross-sectional area of ​​all first air vents 311 is too large, a large amount of heat exchange medium will flow out of the exhaust ports 3261, which is not conducive to the redistribution of the heat exchange medium. If the ratio of the total flow cross-sectional area of ​​all exhaust ports 3261 to the total flow cross-sectional area of ​​all first air vents 311 is too small, the pressure relief effect of the exhaust ports 3261 will be poor.

[0221] In this embodiment, by setting the ratio of the total cross-sectional area of ​​all exhaust ports 3261 to the total cross-sectional area of ​​all first air inlets 311 to a range of 1 / 5 to 1 / 4, the heat exchange medium can be redistributed as much as possible while achieving a good pressure relief effect.

[0222] Similarly, the ratio of the total cross-sectional area of ​​the exhaust port 3261, which is disposed opposite to the second air inlet 312, to the total cross-sectional area of ​​the second air inlet 312 is greater than or equal to one-fifth and less than or equal to one-quarter.

[0223] In some embodiments, the diameter of the exhaust port 3261 is 3mm-8mm.

[0224] For example, the diameter of the exhaust port 3261 is smaller than the diameter of the first sub-port 329.

[0225] Here, the diameter of the exhaust port 3261 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm.

[0226] If the diameter of all the exhaust ports 3261 is too large, a large amount of heat exchange medium will flow out of the exhaust ports 3261, which is not conducive to the redistribution of the heat exchange medium. If the diameter of all the exhaust ports 3261 is too small, the pressure relief effect of the exhaust ports 3261 will be poor.

[0227] In this embodiment, by setting the diameter of the exhaust port 3261 to 3mm-8mm, a diameter within this range is appropriate, which not only has a good pressure relief effect, but also allows for the redistribution of the heat exchange medium as much as possible.

[0228] In some embodiments, the number of exhaust ports 3261 is 2 to 6.

[0229] Here, the number of exhaust ports 3261 can be 2, 3, 4, 5, or 6.

[0230] If there are too many exhaust ports 3261, a large amount of heat exchange medium will flow out of the exhaust ports 3261, which is not conducive to the redistribution of the heat exchange medium. If there are too few exhaust ports 3261, the pressure relief effect of the exhaust ports 3261 will be poor.

[0231] It should be noted that this refers to the number of exhaust ports 3261 corresponding to a first air vent 311 or a second air vent 312 being 2 to 6.

[0232] In this embodiment, by setting the number of exhaust ports 3261 to 2-6, a good pressure relief effect can be achieved while also redistributing the heat exchange medium as much as possible.

[0233] In some embodiments, please refer to Figure 4 The shunt section 327 extends along the first direction, and the windward section 326 is located in the direction of the shunt section 327 toward the center of the protective plate 31. The first direction is perpendicular to the stacking direction of the battery cell 12.

[0234] For example, the sub-flow port 329 is provided in the flow distribution section 327 and is spaced apart along the first direction, thereby facilitating the flow distribution of the heat exchange medium along the first direction.

[0235] The windward section 326 is located in the direction of the diversion section 327 toward the center of the protective plate 31, that is, the windward section 326 is located in the area between the diversion section 327 and the center of the protective plate 31.

[0236] For example, when projected along the thickness direction of the protective plate 31, the projection of the diversion section 327 and the projection of the windward section 326 may or may not have an overlapping area.

[0237] For example, there are multiple windward portions 326, and the multiple windward portions 326 are spaced apart along the first direction.

[0238] In this embodiment, by extending the diversion section 327 along the first direction, the heat exchange medium flowing in from the first air outlet 311 is diverted at least along the first direction through the diversion section 327.

[0239] It is beneficial to redistribute the heat exchange medium through the sub-flow port 329 so that the heat exchange medium flows as far as possible through the edge of the air-cooled chamber 40, so as to achieve heat exchange on the battery cells 12 located at the edge, thereby improving the heat exchange effect and the temperature uniformity of the battery device 100.

[0240] In some embodiments, please refer to Figure 10 The diversion section 327 is arranged around the windward section 326.

[0241] In other words, the projection of the sub-flow port 329 is located around the first air inlet 311, projected along the thickness direction of the protective plate 31.

[0242] In other words, the heat exchange medium flows into the middle region of the air-cooled chamber 40 from the first air inlet 311, and then is diverted through the sub-inlet 329 in the side region of the air-cooled chamber 40. This helps to reduce turbulence in the heat exchange medium during the flow process and improves the heat exchange efficiency. In addition, it also helps to increase the contact area between the heat exchange medium and the first wall 23, further improving the heat exchange efficiency.

[0243] In some embodiments, please refer to Figures 3 to 4 The protective plate 31 is provided with a first air outlet 311 and a second air outlet 312. The current collector 32 includes a first current collector 321 and a second current collector 322. The current collector cavity 323 includes a first current collector cavity 323 and a second current collector cavity 323. The first current collector 321 is provided with a first sub-current outlet 329. The second current collector 322 is provided with a second sub-current outlet 329. The first current collector 321 and the protective plate 31 form the first current collector cavity 323. The second current collector 322 and the protective plate 31 form the second current collector cavity 323. The first current collector cavity 323 is connected to the air-cooled chamber 40 through the first sub-current outlet 329. The second current collector cavity 323 is connected to the air-cooled chamber 40 through the second sub-current outlet 329.

[0244] In other words, the air-cooled assembly 30 includes two manifolds 32.

[0245] Here, the structures of the first current collector 321 and the second current collector 322 can be the same, but they are distinguished by the first current collector 321 and the second current collector 322 for ease of description.

[0246] For example, the first current collector 321 is connected to the protective plate 31, and the gap between the first current collector 321 and the protective plate 31 forms the first current collector cavity 323.

[0247] For example, the second current collector 322 is connected to the protective plate 31, and the gap between the second current collector 322 and the protective plate 31 forms the second current collector cavity 323.

[0248] For example, during the flow of the heat exchange medium, the heat exchange medium enters the first collection cavity 323 corresponding to the first collector 321 through the first air outlet 311, and is distributed through the first sub-outlet 329 corresponding to the first collection cavity 323. The distributed heat exchange medium enters the air-cooled chamber 40 and exchanges heat with the first wall 23. The heat exchange medium after heat exchange enters the corresponding second collection cavity 323 through the second sub-outlet 329 of the second collector 322, and flows out of the battery device 100 through the second air outlet 312 connected to the second collection cavity 323.

[0249] Of course, during the flow of the heat exchange medium, the heat exchange medium can also enter the second collection cavity 323 corresponding to the second collector 322 through the second air outlet 312, and the heat exchange medium is distributed through the second sub-flow outlet 329 corresponding to the second collection cavity 323. The distributed heat exchange medium enters the air-cooled chamber 40 and exchanges heat with the first wall 23. The heat exchange medium after heat exchange enters the corresponding first collection cavity 323 through the first sub-flow outlet 329 of the first collector 321, and flows out of the battery device 100 through the first air outlet 311 connected to the first collection cavity 323.

[0250] In this embodiment, by including a first current collector 321 and a second current collector 322 in the current collector 32, it is convenient to set up the first current collector cavity 323 and the second current collector cavity 323, and it is beneficial to simplify the structure of the current collector 32, thereby improving manufacturing efficiency.

[0251] In some embodiments, please refer to Figure 4 The first current collector 321 and the second current collector 322 are located at the two ends of the protective plate 31 along the second direction, which is parallel to the stacking direction of the battery cells 12.

[0252] The first direction and the second direction are perpendicular to each other.

[0253] That is, the first flow collector 323 and the second flow collector 323 are located at opposite ends of the protective plate 31 along the second direction.

[0254] In this embodiment, by setting the first collector 321 and the second collector 322 at opposite ends of the protective plate 31 along the second direction, it is beneficial to reduce the turbulence of the heat exchange medium during the flow process and improve the heat exchange efficiency. In addition, it is also beneficial to increase the contact area between the heat exchange medium and the first wall 23, further improving the heat exchange efficiency.

[0255] In some embodiments, please refer to Figure 4 The first current collector 321 and the second current collector 322 are symmetrical components.

[0256] For example, the first current collector 321 and the second current collector 322 have the same structure and are symmetrically arranged on the protective plate 31.

[0257] In this embodiment, by setting the first current collector 321 and the second current collector 322 as symmetrical components, the versatility of the current collector 32 is improved, and there is no need to set a foolproof structure, thereby improving assembly efficiency.

[0258] In some embodiments, please refer to Figure 10The flow collecting cavity 323 includes a first flow collecting cavity 323 and a second flow collecting cavity 323. The flow collecting component 32 includes a first region 324 and a second region 325. The first region 324 and the protective plate 31 form the first flow collecting cavity 323, and the second region 325 and the protective plate 31 form the second flow collecting cavity 323. A spacer 328 is provided between the first region 324 and the second region 325, and the spacer 328 abuts against the protective plate 31.

[0259] In other words, the current collector 32 includes a first zone 324, a second zone 325 and a spacer 328, with the spacer 328 separating the first zone 324 from the second zone 325.

[0260] For example, the spacer 328 is sealed to the protective plate 31 so that the first collection cavity 323 and the second collection cavity 323 are not in communication.

[0261] For example, the spacer 328 and the protective plate 31 may be bonded together.

[0262] In this embodiment, the current collector 32 is provided with a spacing portion 328 to separate the first region 324 and the second region 325, so that the first current collector 323 and the second current collector 323 are not connected. The first current collector 323 and the second current collector 323 are formed simultaneously by one current collector 32, which helps to reduce the number of parts, reduce costs, and improve assembly efficiency.

[0263] In some embodiments, please refer to Figure 10 The second zone 325 is set up around the first zone 324.

[0264] In other words, the second zone 325 is located around the first zone 324.

[0265] In other embodiments, the first region 324 may surround the second region 325.

[0266] In some embodiments, please refer to Figure 10 The first air inlet 311 is the air inlet, and the second air inlet 312 is the air outlet.

[0267] In other words, the heat exchange medium flows in from the first air vent 311 corresponding to the first zone 324, exchanges heat with the battery cell 12, and then flows out through the second air vent 312 corresponding to the second zone 325, which helps to further improve the heat exchange efficiency.

[0268] In other embodiments, the first air vent 311 may be an air outlet and the second air vent 312 may be an air inlet.

[0269] In other words, the heat exchange medium flows in from the second air outlet 312 corresponding to the second zone 325, and after exchanging heat with the battery cell 12, it flows out through the first air outlet 311 corresponding to the first zone 324, which helps to further improve the heat exchange efficiency.

[0270] In some embodiments, please refer to Figure 8 and Figure 13 Each battery cell 12 has a pressure relief section 121. Each battery cell 12 is arranged such that the pressure relief section 121 faces the first wall 23. The first wall 23 is provided with a plurality of pressure relief structures 231, which are projected onto the same projection plane along the thickness direction of the first wall 23. The projection of each pressure relief section 121 is located within the projection of the corresponding pressure relief structure 231.

[0271] Here, the statement that the projection of each pressure relief part 121 is located within the projection of the corresponding pressure relief structure 231 means that all the projections of the pressure relief part 121 are located within the projection of the corresponding pressure relief structure 231, or the projection of the pressure relief port of the pressure relief part 121 is located within the projection of the corresponding pressure relief structure 231.

[0272] The pressure relief section 121 is used to release internal gas when the internal pressure of the battery cell 12 rises abnormally (such as in the case of overcharging, overheating or short circuit), to prevent the battery from exploding or catching fire.

[0273] In some examples, the pressure relief section 121 includes a pressure relief valve. If the gas pressure inside the battery cell 12 exceeds the pressure threshold of the pressure relief valve, it can be released through the pressure relief valve. That is, the gas inside the battery cell 12 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 12.

[0274] A pressure relief structure 231 can correspond to the pressure relief part 121 of a single battery cell 12, or it can correspond to the pressure relief part 121 of multiple battery cells 12.

[0275] Here, the pressure relief structure 231 corresponding to the first wall 23 can be formed with through holes, or it can be other structures that are together with the pressure relief structure.

[0276] In this embodiment, since the projection of each pressure relief section 121 is located within the projection of the corresponding pressure relief structure 231, the pressure relief airflow ejected from the pressure relief section 121 passes through the pressure relief structure 231 and passes through the first wall 23, making it less likely to impact the first wall 23 or its structure, and thus timely discharges from the containment cavity to protect other battery cells 12, the housing assembly and other components therein.

[0277] In some embodiments, please refer to Figure 13 The battery device 100 also includes a protective film 60, which is disposed on the first wall 23 and covers the through hole.

[0278] In this embodiment, the protective film 60 is used to cover the through hole. In other words, when projected along a third direction, the projection of the protective film 60 covers the projection of the corresponding through hole. The protective film 60 can isolate the space of the receiving cavity relative to the outside of the first wall 23 so that the receiving cavity is relatively sealed.

[0279] In this embodiment, the protective film 60 is configured to be ruptured by the pressure relief airflow. That is, when the pressure relief section 121 of the battery cell 12 is ejected, the pressure relief airflow ruptures the protective film 60 through the high-pressure airflow so that it can flow through the through hole to the side of the first wall 23 away from the receiving cavity.

[0280] In this embodiment, the protective film 60 can be made of an insulating and easily broken material, such as polyethylene terephthalate.

[0281] The technical solution of this application embodiment, by setting a protective film 60, can maintain the relative sealing of the receiving cavity, and can also break through the explosion-proof film when the pressure relief part 121 ejects pressure relief airflow, so that the pressure relief airflow can enter the through hole, thereby improving the reliability of the battery device 100.

[0282] In some embodiments, please refer to Figures 4 to 6 The air-cooled chamber 40 includes an air-cooled flow channel 41 and a pressure relief chamber 42. The pressure relief chamber 42 is correspondingly arranged with the pressure relief structure 231. The air-cooled flow channel 41 is connected to the first air outlet 311 and the second air outlet 312.

[0283] The pressure relief chamber 42 can be connected to the outside to release the pressure relief airflow to the outside, or it can be relatively closed off from the outside, with the protective plate 31 bearing the impact. Alternatively, when it is necessary to release the pressure relief airflow, the pressure relief chamber 42 can be connected to the external environment.

[0284] The pressure relief airflow ejected from the pressure relief section 121 enters the pressure relief chamber 42 through the through hole. Since the pressure relief chamber 42 has a large space, it can effectively buffer the impact, reduce the risk of thermal runaway of the battery device 100, and improve the reliability of the battery device 100.

[0285] For example, the pressure relief chamber 42 is selectively connected to the external environment.

[0286] The selective connection between the pressure relief chamber 42 and the external environment means that the pressure relief chamber 42 is isolated from the external environment under normal circumstances, but when the pressure relief section 121 ejects pressure relief airflow, the pressure relief chamber 42 is connected to the external environment, thereby releasing the pressure relief airflow.

[0287] In some examples, the opening of the pressure relief chamber 42 that connects to the external environment is provided with a perforable membrane structure, which can be similar to the protective membrane 60 of the first wall 23. In other examples, the opening of the pressure relief chamber 42 that connects to the external environment is provided with a valve. When the preset opening conditions of the valve are met, the pressure relief chamber 42 connects to the external environment through the valve. The preset opening conditions can be set based on the air pressure and temperature inside the pressure relief chamber 42.

[0288] Here, by selectively connecting the pressure relief chamber 42 to the external environment, the internal environment of the pressure relief chamber 42 and the housing components can be kept isolated from the outside world, and the pressure relief airflow can be discharged in a timely manner when needed, thereby improving the reliability of the battery device 100.

[0289] An air-cooled flow channel 41 is formed in the air-cooled chamber 40. The air-cooled flow channel 41 is connected to the first air outlet 311 and the second air outlet 312. When necessary, the pressure relief chamber 42 is connected to the air-cooled flow channel 41. The pressure relief airflow in the pressure relief chamber 42 is discharged to the air-cooled flow channel 41 and discharged to the external environment through the first air outlet 311 and / or the second air outlet 312.

[0290] Here, the air-cooled flow channel 41 can be in the form of a straight line, a curved line, a spiral line, a branch line, or other structural forms. The air-cooled flow channel 41 can be formed by a pipe with a connecting hole, or it can be formed by partitions, protrusions, or other structures within the air-cooled chamber 40 that separate the air-cooled chamber 40.

[0291] For example, different air-cooling channels 41 can correspond to different battery cell groups 10, thereby reducing the mutual influence between battery cell groups 10.

[0292] For example, the air-cooled flow channel 41 can be a labyrinthine folded exhaust channel. On the one hand, it is beneficial to improve the cooling efficiency. On the other hand, the high-temperature smoke generated by the thermal runaway of the battery cell 12 is lengthened, which realizes the cooling of the smoke after thermal runaway and avoids the external flame of the box assembly after thermal runaway.

[0293] In some embodiments, please refer to Figures 2 to 6 Projecting along the extension direction of the air-cooled flow channel 41, the projection of the sub-flow port 329 coincides with the projection of the air-cooled flow channel 41.

[0294] In other words, the sub-outlet 329 is directly opposite the air-cooled flow channel 41.

[0295] In this embodiment, by projecting along the extension direction of the air-cooled channel 41, the projection of the sub-port 329 is made to coincide with the projection of the air-cooled channel 41, which facilitates the flow of the heat exchange medium between the sub-port 329 and the air-cooled channel 41, thereby improving the heat exchange efficiency.

[0296] Of course, in some other embodiments, the projection of the sub-outlet 329 and the projection of the air-cooled channel 41 may have an overlapping area.

[0297] For example, the pressure relief chamber 42 extends along a second direction, which is parallel to the stacking direction of the battery cells 12.

[0298] In other words, the pressure relief chamber 42 extends along the stacking direction of the battery cells 12.

[0299] In this way, one pressure relief chamber 42 can correspond to one battery cell 12, one pressure relief chamber 42 can correspond to multiple battery cells 12, or one pressure relief chamber 42 can correspond to a battery cell group 10.

[0300] In some embodiments, please refer to Figures 3 to 4 The pressure relief chamber 42 is arranged adjacent to the air-cooled flow channel 41.

[0301] For example, each pressure relief chamber 42 is spaced apart, and an air-cooled flow channel 41 is provided between adjacent pressure relief chambers 42. At the same time, each air-cooled flow channel 41 is spaced apart, and a pressure relief chamber 42 is provided between adjacent air-cooled flow channels 41.

[0302] The structure is compact and can make full use of the space inside the air-cooled chamber 40. Under normal use, the battery cell 12 can be heated through the air-cooled flow channel 41. When the pressure relief section 121 sprays pressure relief airflow, the pressure relief chamber 42 can be connected to the external environment through the air-cooled flow channel 41 to release the pressure relief airflow.

[0303] In some embodiments, please refer to Figure 13 The battery device 100 also includes a heat absorption component 70, which is disposed in the air-cooled chamber 40 and is disposed in the air-cooled component 30 opposite to the pressure relief part 121 of the battery cell 12.

[0304] In this embodiment, the heat-absorbing component 70 refers to a component capable of absorbing heat to lower the ambient temperature, thereby enabling the battery cell 12 to operate within a suitable temperature range. The heat-absorbing component 70 also effectively reduces the impact of high-temperature, high-pressure venting gas on other components. The heat-absorbing component 70 can be a phase-change heat-absorbing structure, a heat pipe heat-absorbing structure, a liquid-cooled plate structure, a thermoelectric heat-absorbing structure, etc.

[0305] In this embodiment, the heat absorption component 70 is located in the air-cooled chamber 40, that is, the heat absorption component 70 is disposed between the first wall 23 and the protective plate 31. The heat absorption component 70 can be connected to the first wall 23, the protective plate 31 or other structures of the housing assembly.

[0306] For example, the heat-absorbing component 70 is located in the pressure relief chamber 42.

[0307] In this embodiment, the heat-absorbing component 70 and the pressure relief portion 121 of the battery cell 12 are opposite each other, meaning that the heat-absorbing component 70 and the corresponding pressure relief portion 121 are arranged sequentially along a certain direction, and the airflow between them can also flow along that direction. That is, the pressure relief airflow released by the pressure relief portion 121 can flow to the heat-absorbing component 70 along that direction. The relative direction between the heat-absorbing component 70 and the battery cell 12 can be arranged at an angle to the first wall 23, for example, the relative direction between the heat-absorbing component 70 and the battery cell 12 is a third direction.

[0308] In some examples, the heat-absorbing component 70 is configured for a single battery cell 12, while in other examples, the heat-absorbing component 70 is configured for multiple battery cells 12 in a battery cell group 10, meaning that the heat released by multiple battery cells 12 can be absorbed by a single heat-absorbing component 70.

[0309] The technical solution of this application embodiment, by setting a heat-absorbing component 70, which is arranged relative to the pressure relief part 121, allows the pressure relief gas generated by the pressure relief part 121 to be effectively conducted to the heat-absorbing component 70. On the one hand, the heat-absorbing component 70 can absorb heat, thereby reducing the risk of the battery cell 12 running out of control due to high temperature. On the other hand, the heat-absorbing component 70 can also block the impact of the pressure relief gas, reduce the adverse effects of the pressure relief gas on other components, and improve the reliability of the battery device 100.

[0310] In some embodiments, the heat-absorbing component 70 includes at least a phase change layer 71 made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

[0311] In this embodiment of the application, the phase change material is a material that can absorb or release heat through a change in physical state (such as from solid to liquid, or from liquid to gas) within a specific temperature range.

[0312] In this embodiment, the phase change material is at least one of deionized water, hydrated inorganic gel, and hydrated organic gel. In some examples, the phase change material is stored within the pores of an adsorbent material. The adsorbent material is at least one of acrylic foam, melamine foam, polyurethane foam, and silicone foam.

[0313] In this embodiment, the first phase change temperature of the phase change material is the temperature at which the phase change material undergoes a physical transformation and absorbs heat. A higher first phase change temperature results in better heat absorption capacity, making it easier to absorb more heat. A lower first phase change temperature helps to maintain the battery cell 12 at a more suitable temperature.

[0314] In some examples, the first phase transition temperature ranges from 90°C to 150°C. For example, the first phase transition temperature is a point value of any one of 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, and 150°C, or a point value between any two of them.

[0315] In this embodiment, the phase change material may also have a second phase change temperature, which is the temperature at which the phase change material undergoes a physical transformation and releases heat. In a low-temperature environment, the heat released by the phase change material can maintain the battery cell 12 at a suitable temperature, reducing the possibility of the battery cell 12 failing due to low temperature.

[0316] In some examples, the second phase transition temperature ranges from -40°C to 0°C. For example, the second phase transition temperature may be a point value among -40°C, -30°C, -20°C, -10°C, and 0°C, or a point value between any two of these.

[0317] In some examples, please refer to Figure 13 The heat-absorbing component 70 also includes heat-resistant materials such as mica, silicone, glass fiber, and graphite disposed on the phase change layer 71 to improve the heat resistance and impact resistance of the heat-absorbing component 70.

[0318] The technical solution of this application embodiment, by setting a phase change layer 71, the phase change material of the phase change layer 71 can absorb or release heat, and the phase change temperature of the phase change layer 71 is set within a suitable range. The phase change layer 71 absorbs heat to reduce the possibility of thermal runaway of the battery cell 12, and releases heat to reduce the possibility of low-temperature failure of the battery cell 12, so as to provide a suitable temperature environment for the battery cell 12. In addition, the heat-absorbing component 70 containing the phase change layer 71 can also effectively block the impact of the depressurized gas on other components by absorbing the heat of the depressurized gas.

[0319] In some embodiments, please refer to Figure 13 The heat absorption assembly 70 also includes a heat-conducting layer 72, which is stacked with a phase change layer 71. Along the stacking direction, the heat-conducting layer 72 is located at least on the side of the phase change layer 71 closest to the pressure relief portion 121.

[0320] In this embodiment, the thermally conductive layer 72 is used for rapid and even heat conduction, thereby improving the heat transfer efficiency between the pressure relief section 121 and the phase change layer 71. The material of the thermally conductive layer 72 can be one or more combinations of titanium, steel, copper, silver, ceramics, and graphene.

[0321] In this embodiment, the stacking direction of the thermally conductive layer 72 and the phase change layer 71 may be at an angle to the extension direction of the first wall 23. For example, the thermally conductive layer 72 and the phase change layer 71 are stacked along a third direction.

[0322] In this embodiment, the thermal conductive layer 72 can be disposed on the side of the phase change layer 71 close to the pressure relief part 121, or on the side of the phase change layer 71 away from the pressure relief part 121, or the thermal conductive layer 72 can be stacked on both sides of the phase change layer 71.

[0323] The technical solution of this application embodiment, by setting a heat-conducting layer 72, can improve the heat transfer efficiency between the pressure relief part 121 and the phase change layer 71, improve the temperature regulation capability of the heat absorption component 70, and thus improve the reliability of the battery device 100.

[0324] In some embodiments, please refer to Figures 3 to 4 A separator 50 is provided between the first wall 23 and the air-cooling assembly 30. The separator 50 abuts against the first wall 23 and the air-cooling assembly 30 respectively, thereby defining a pressure relief chamber 42. The heat absorption assembly 70 is located in the pressure relief chamber 42. The separator 50 is configured to break in the event of thermal runaway of the battery cell 12, thereby connecting the pressure relief chamber 42 with the first air vent 311 and / or the second air vent 312.

[0325] In this embodiment, the partition 50 is used to separate the receiving space between the first wall 23 and the protective plate 31. The partition 50 can also be used to define the boundaries of the pressure relief chamber 42, the air-cooled chamber 40, etc. In some examples, the partition 50 abuts against the first wall 23 and the protective plate 31 respectively, and defines the boundary of the pressure relief chamber 42.

[0326] In this embodiment, the partition 50 can be a frame structure, a ring structure, etc. In some examples, the partition 50 is a rectangular frame structure. The length direction of the partition 50 is set along the first direction, and the width direction of the partition 50 is set along the second direction. The two sides of the partition 50 along the third direction respectively abut against the first wall 23 and the protective plate 31, thereby forming a closed pressure relief cavity 42. The heat absorption component 70 is located in the pressure relief cavity 42.

[0327] In this embodiment, in the absence of thermal runaway, the separator 50 can isolate the air-cooled flow channel 41 from the pressure relief chamber 42, reducing the impact of the heat exchange medium on the pressure relief structure 231. In the event of thermal runaway of the battery cell 12, such as the ejection of pressure relief gas from the pressure relief section 121, the separator 50 can be broken by the pressure relief gas flow, thereby connecting the pressure relief chamber 42 to the air-cooled flow channel 41.

[0328] In this embodiment, the fractured form of the separator 50 can be provided with reference to the protective film 60 described above. Alternatively, the fracture of the separator 50 can be achieved through structure. For example, the side thickness of the separator 50 along the width direction is small, making it easy to be broken under the action of depressurized airflow; or, for example, the connection positions of each part of the separator 50 are provided with weakening structures such as grooves, so that the separator 50 fractures along the weakening structure position under the action of depressurized airflow.

[0329] The technical solution of this application embodiment, by setting the separator 50, facilitates the definition of the pressure relief chamber 42, so as to keep the pressure relief chamber 42 sealed relative to the external environment. The separator 50 can also break under the action of the pressure relief airflow ejected by the pressure relief section 121, so that the pressure relief airflow enters the air-cooling channel 41 and is discharged to the external environment through the first air outlet 311 and / or the second air outlet 312, thereby improving the reliability of the battery device 100.

[0330] In some embodiments, please refer to Figures 3 to 4 The housing assembly also includes a partition 50, which is located between the first wall 23 and the air-cooling assembly 30, and abuts against both the first wall 23 and the air-cooling assembly 30, thereby defining a pressure relief chamber 42 and an air-cooling flow channel 41. The partition 50 is configured to break in the event of thermal runaway of the battery cell 12, thereby connecting the pressure relief chamber 42 with the first air vent 311 and / or the second air vent 312.

[0331] In this embodiment, in the absence of thermal runaway, the separator 50 can isolate the air-cooled flow channel 41 from the pressure relief chamber 42, reducing the impact of the heat exchange medium on the pressure relief structure 231. In the event of thermal runaway of the battery cell 12, such as the ejection of pressure relief gas from the pressure relief section 121, the separator 50 can be broken by the pressure relief gas flow, thereby connecting the pressure relief chamber 42 to the air-cooled flow channel 41.

[0332] The technical solution of this application embodiment, by setting a separator 50, facilitates the definition of the pressure relief chamber 42 and the air-cooling channel 41. The separator 50 can also break under the action of the pressure relief airflow ejected from the pressure relief section 121, so that the pressure relief airflow enters the air-cooling channel 41 and is discharged to the external environment through the first air outlet 311 and / or the second air outlet 312, thereby improving the reliability of the battery device 100.

[0333] Here, the heat exchange medium flowing out of the collection cavity 323 can flow along the air-cooled flow channel 41, or in other words, the heat exchange medium flowing along the air-cooled flow channel 41 can flow into the collection cavity 323, thereby achieving targeted heat exchange and reducing turbulence and increasing flow velocity.

[0334] In this embodiment, by setting the separator 50 to limit the pressure relief chamber 42 and the air-cooled flow channel 41, targeted heat exchange can be achieved, which is beneficial to improving heat exchange efficiency. It can also reduce turbulence, increase flow velocity, and further improve heat exchange efficiency.

[0335] In some embodiments, please refer to Figure 3 The separator 50 includes a first wall 23 and a second wall that are disposed opposite to each other. The first wall 23 forms the cavity wall of the air-cooled flow channel 41, and the second wall forms at least a portion of the intermediate cavity wall of the pressure relief cavity 42.

[0336] For example, a pressure relief chamber 42 may be defined between adjacent partitions 50, or an air-cooling flow channel 41 may be defined between adjacent partitions 50.

[0337] In other words, the pressure relief chamber 42 and the air-cooled flow channel 41 are disposed on both sides of the partition 50, so that the first wall 23 of the partition 50 facing the air-cooled flow channel 41 forms the cavity wall of the air-cooled flow channel 41, and the second wall of the partition 50 facing the pressure relief chamber 42 forms the cavity wall of the pressure relief chamber 42.

[0338] In some embodiments, please refer to Figures 3 to 4 The partition 50 at least defines the cavity wall of the pressure relief chamber 42 located between the first wall 23 and the protective plate 31.

[0339] In other words, the partition 50 at least defines the intermediate cavity wall of the pressure relief chamber 42.

[0340] Here, the partition 50 may be a cavity wall that only defines the pressure relief chamber 42 between the first wall 23 and the protective plate 31, and the first wall 23 and the protective plate 31 define the end wall of the pressure relief chamber 42; the partition 50 may also be a cavity wall that, in addition to defining the pressure relief chamber 42 between the first wall 23 and the protective plate 31, also defines at least a portion of the end wall of the pressure relief chamber 42.

[0341] By setting a separator 50 and defining at least the cavity wall of the pressure relief chamber 42 located between the first wall 23 and the protective plate 31, the structure is simple and conducive to improving assembly efficiency.

[0342] In some embodiments, please refer to Figure 3 The separator 50 includes a first sidewall 51, a second sidewall 52, a third sidewall 53, and a fourth sidewall 54 connected in sequence. The first sidewall 51 and the third sidewall 53 are arranged opposite each other along a second direction, and the second sidewall 52 and the fourth sidewall 54 are arranged opposite each other along a first direction. The first sidewall 51, the second sidewall 52, the third sidewall 53, and the fourth sidewall 54 form a pressure relief chamber 42 located between the first wall 23 and the protective plate 31. The first direction and the second direction are perpendicular to the thickness direction of the protective plate 31.

[0343] In other words, the separator 50 can be a rectangular structure.

[0344] For example, the first sidewall 51, the second sidewall 52, the third sidewall 53 and the fourth sidewall 54 abut against the first wall 23 and the protective plate 31 at both ends along the thickness direction of the protective plate 31, respectively.

[0345] For example, the first sidewall 51, the second sidewall 52, the third sidewall 53, and the fourth sidewall 54 are an integral structure. This helps to improve assembly efficiency.

[0346] For example, the first sidewall 51, the second sidewall 52, the third sidewall 53, and the fourth sidewall 54 are pre-assembled together and then assembled between the first wall 23 and the protective plate 31. This helps to improve assembly efficiency.

[0347] For example, the ends of the first sidewall 51, the second sidewall 52, the third sidewall 53 and the fourth sidewall 54 near the protective plate 31 are all connected to the protective plate 31, for example, by adhesive bonding.

[0348] For example, at least one of the first sidewall 51, the second sidewall 52, the third sidewall 53, and the fourth sidewall 54 is not connected to the first wall 23 at one end near the first wall 23, while the other parts are connected to the first wall 23, for example, by adhesive bonding. This facilitates directional pressure relief.

[0349] Here, no additional connecting parts are needed between the first sidewall 51, the second sidewall 52, the third sidewall 53, and the fourth sidewall and the first wall 23 and the protective plate 31, while ensuring the airtightness of the pressure relief chamber 42.

[0350] In this embodiment, by setting the separator 50 to include a first sidewall 51, a second sidewall 52, a third sidewall 53 and a fourth sidewall 54 connected in sequence, the structure is simple and facilitates the formation of the pressure relief chamber 42.

[0351] In some embodiments, please refer to Figures 3 to 4 The wall thickness of at least one of the first sidewall 51 and the third sidewall 53 is less than the wall thickness of the second sidewall 52 and the fourth sidewall 54.

[0352] In other words, at least one of the first sidewall 51 and the third sidewall 53 forms a weakened region. The structural strength of the weakened region is less than the structural strength of other areas of the intermediate cavity wall except for the weakened region. Thus, when the pressure inside the pressure relief cavity 42 is too high, the weakened region will be destroyed preferentially.

[0353] Here, the wall thickness of the first sidewall 51 may be less than the wall thickness of the second sidewall 52 and the fourth sidewall 54, or the wall thickness of the third sidewall 53 may be less than the wall thickness of the second sidewall 52 and the fourth sidewall 54, or the wall thickness of both the first sidewall 51 and the third sidewall 53 may be less than the wall thickness of the second sidewall 52 and the fourth sidewall 54.

[0354] For example, both the first sidewall 51 and the third sidewall 53 are weakened regions.

[0355] In this embodiment, a weakened region is formed by making at least one of the first sidewall 51 and the third sidewall 53 thinner than the second sidewall 52 and the fourth sidewall 54, thereby achieving directional pressure relief of the battery device 100.

[0356] In some embodiments, please refer to Figures 3 to 4 The pressure relief structure 231 extends along the second direction, and the second side wall 52 and the fourth side wall 54 are respectively disposed on both sides of the pressure relief structure 231 along the first direction.

[0357] That is, the second sidewall 52 and the fourth sidewall 54 also extend along the second direction, and the first sidewall 51 and the third sidewall 53 extend along the first direction, so that the second sidewall 52 and the fourth sidewall 54 are respectively disposed on both sides of the pressure relief structure 231 along the first direction, and the first sidewall 51 and the third sidewall 53 are respectively disposed on both sides of the pressure relief structure 231 along the second direction.

[0358] For example, the second sidewall 52 and the fourth sidewall 54 form the cavity wall of the air-cooled flow channel 41 on the side opposite to the pressure relief structure 231.

[0359] In one specific embodiment, the protective plate 31 can be designed with a first air inlet 311 and / or a second air inlet 312 according to the external pipe connection requirements, and the pressure relief chamber 42, the air-cooling channel 41, and the first air inlet 311 and / or the second air inlet 312 can be designed according to the actual number of module rows (number of battery cell groups 10) so that the cooling airflow is evenly distributed in each air-cooling channel 41.

[0360] In some embodiments, please refer to Figures 3 to 6 The air-cooled chamber 40 is provided with a boss structure 313, which protrudes from the air-cooled assembly 30 toward the battery cell 12.

[0361] The top wall of the boss structure 313 forms the cavity wall of the air-cooled flow channel 41. Here, the top wall of the boss structure 313 facing the battery cell 12 is the cavity wall of the air-cooled flow channel 41. In other words, by setting the boss structure 313, it is beneficial to reduce the flow cross-sectional area of ​​the air-cooled flow channel 41.

[0362] For example, there are multiple boss structures 313, and the multiple boss structures 313 are spaced apart along the first direction.

[0363] For example, each boss structure 313 corresponds to an air-cooled flow channel 41.

[0364] Of course, some air-cooled channels 41 may be provided with boss structures 313, while other air-cooled channels 41 may not be provided with boss structures 313.

[0365] In this embodiment, the air-cooled component 30, by setting the boss structure 313, helps to reduce the cross-sectional area of ​​the air-cooled flow channel 41 and increase the flow rate of the heat exchange medium, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell 12 to be discharged in time, which helps to reduce the impact on other battery cells 12, thereby reducing the chain reaction of thermal runaway of the battery cell 12. In addition, it also helps to improve the structural strength of the protective plate 31.

[0366] It should be noted that the specific structure of the boss structure 313 is not limited here.

[0367] In some embodiments, please refer to Figures 2 to 6 The air-cooled component 30 has a protrusion on the side facing the battery cell 12, and the boss structure 313 is a protrusion.

[0368] For example, the protective plate 31 is recessed on the side away from the battery cell 12 to form a groove, so that the protective plate 31 protrudes towards the battery cell 12 to form a boss structure 313, that is, the boss structure 313 protrudes from the air-cooling assembly 30 towards the battery cell 12.

[0369] Of course, the protective plate 31 can also be thickened to form a convex shape on the side facing the battery cell 12.

[0370] In some embodiments, please refer to Figures 3 to 6 The boss structure 313 is located between two adjacent separators 50.

[0371] Here, some of the boss structures 313 may be located between two adjacent partitions 50, or all of the boss structures 313 may be located between two adjacent partitions 50.

[0372] In this embodiment, the air-cooled assembly 30 is provided with a boss structure 313, and at least part of the boss structure 313 is provided between two adjacent separators 50. This helps to reduce the cross-sectional area of ​​the air-cooled flow channel 41 and increase the flow rate of the heat exchange medium, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell 12 to be discharged in time, which helps to reduce the impact on other battery cells 12. This can reduce the chain reaction of thermal runaway of the battery cell 12. In addition, it also helps to improve the structural strength of the protective plate 31.

[0373] In some embodiments, please refer to Figures 3 to 6 Multiple battery cells 12 are stacked to form a battery cell group 10, and a boss structure 313 is located at the bottom of the battery cell group 10 and extends along the stacking direction.

[0374] For example, each battery cell group 10 may have a boss structure 313 at its bottom, or some battery cell groups 10 may have a boss structure 313 at their bottom.

[0375] For example, the number of boss structures 313 provided on the bottom of each battery cell pack 10 can be one or more.

[0376] Here, by setting the boss structure 313 at the bottom of the battery cell pack 10, it is beneficial to reduce the flow cross-sectional area of ​​the air-cooled flow channel 41 located at the bottom of the battery cell pack 10, thereby increasing the flow rate of the heat exchange medium at the bottom of the battery cell pack 10.

[0377] In this embodiment, by setting the boss structure 313 at the bottom of the battery cell group 10, it is beneficial to reduce the flow cross-sectional area of ​​the air-cooled flow channel 41 located at the bottom of the battery cell group 10, thereby increasing the flow rate of the heat exchange medium at the bottom of the battery cell group 10 and thus improving the heat exchange efficiency of the battery cell group 10.

[0378] In some embodiments, please refer to Figures 5 to 6 The distance between the top wall of the boss structure 313 facing the battery cell 12 and the first wall 23 is 5mm-10mm.

[0379] In other words, the distance between the top wall of the boss structure 313 and the first wall 23 is 5mm-10mm.

[0380] The distance between the top wall of the boss structure 313 facing the battery cell 12 and the first wall 23 can be any one of 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.7mm, 8mm, 8.5mm, 9mm, 10mm or any two of them.

[0381] In this embodiment, by setting the distance between the top wall of the boss structure 313 facing the battery cell 12 and the first wall 23 to 5mm-10mm, it is beneficial to ensure that the fluid has a certain flow velocity and a certain flow rate between the boss structure 313 and the first wall 23, thereby further improving the cooling efficiency and exhaust efficiency.

[0382] In some embodiments, please refer to Figures 5 to 6 The protrusion structure 313 protrudes 5mm-10mm from the side of the air-cooled component 30 toward the battery cell 12.

[0383] The protrusion of the boss structure 313 towards the battery cell 12 from the air-cooled component 30 can be any one of 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.7mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or any combination thereof.

[0384] In this embodiment, by setting the protrusion of the boss structure 313 from the air-cooling assembly 30 toward the battery cell 12 to 5mm-10mm, the protective plate 31 can have sufficient structural strength and impact resistance, while also allowing a certain gap between the boss structure 313 and the box body 20, which is beneficial to improving cooling efficiency and exhaust efficiency.

[0385] In some embodiments, please refer to Figures 5 to 6 The protective plate 31 is sealed to the box body 20.

[0386] In other words, the protective plate 31 is connected to the first wall 23, and the connection has a sealing structure.

[0387] In this embodiment, the protective plate 31 is connected to the first wall 23. In other embodiments, other structures of the air-cooling component 30 may be connected to the first wall 23, such as the separator 50 or the collector 32 connected to the first wall 23.

[0388] For example, the sealing structure can be a sealing ring, a sealing gasket, a sealing filler, etc., and the sealing structure can be made of elastic materials such as rubber and silicone, thereby achieving a good sealing effect.

[0389] For example, an adhesive layer is provided between the protective plate 31 and the box body 20, and the protective plate 31 and the box body 20 are sealed together by the adhesive layer.

[0390] The technical solution of this application embodiment isolates the pressure relief chamber 42 and other cavities from the external environment by sealing the protective plate 31 with the box body 20, or limits the space of the air-cooled chamber 40 and the collection chamber 323, so as to maintain the integrity of the flow channel of the heat exchange medium / pressure relief airflow and reduce the possibility of air leakage.

[0391] In some embodiments, the protective plate 31 comprises a fiber-reinforced composite laminate structure.

[0392] In this embodiment, the protective plate 31 has a laminated structure, which is made of fiber-reinforced composite material layers. The protective plate 31 may include one or more fiber-reinforced composite material layers.

[0393] In some examples, the fiber-reinforced composite layer of the protective plate 31 includes a first substrate and a first fiber.

[0394] In one example, the first substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the first substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0395] In some examples, the first fiber is either carbon fiber or polyethylene fiber; in other examples, the first fiber is a composite of carbon fiber and polyethylene fiber.

[0396] The technical solution of this application embodiment provides that the protective plate 31 formed by the fiber-reinforced composite material layer has good structural strength and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials.

[0397] In some embodiments, the manifold 32 includes a fiber-reinforced composite laminate structure.

[0398] In this embodiment, the current collector 32 has a laminated structure, which is made of fiber-reinforced composite material layers. The current collector 32 may include one or more fiber-reinforced composite material layers.

[0399] In some examples, the fiber-reinforced composite layer of the manifold 32 includes a second substrate and a second fiber.

[0400] In one example, the second substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the second substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0401] In some examples, the second fiber is either carbon fiber or polyethylene fiber; in other examples, the second fiber is a composite of carbon fiber and polyethylene fiber.

[0402] The technical solution of this application embodiment provides that the current collector 32 formed by the fiber reinforced composite material layer has good structural strength and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials.

[0403] In other embodiments, the current collector 32 includes a metal component. This allows the current collector to have a certain structural strength.

[0404] In some embodiments, the box body 20 includes a fiber-reinforced composite laminate structure.

[0405] In this embodiment, the box body 20 has a laminated structure, which is made of fiber-reinforced composite material layers. The box body 20 may include one or more fiber-reinforced composite material layers.

[0406] In some examples, the fiber-reinforced composite layer of the box body 20 includes a third substrate and a third fiber.

[0407] In one example, the third substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the third substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0408] In some examples, the third fiber is either carbon fiber or polyethylene fiber; in other examples, the third fiber is a composite of carbon fiber and polyethylene fiber.

[0409] The technical solution of this application embodiment provides that the box body 20 formed by the fiber reinforced composite material layer has good structural strength and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials.

[0410] In some examples, the first wall 23 includes a laminated insulating structure layer and a fiber composite material layer, with the insulating structure layer located between the fiber composite material layer and the battery cell 12 along the thickness direction of the first wall 23.

[0411] In this embodiment, the insulating structural layer and the fiber composite material layer are stacked, specifically, both the insulating structural layer and the fiber composite material layer are plate-like structures. Projecting along the thickness direction of the plate-like structure, the projections of the insulating structural layer and the fiber composite material layer at least partially overlap, so that the insulating structural layer and the fiber composite material layer are stacked together to form an integral laminate. The stacking direction of the insulating structural layer and the fiber composite layer corresponds to the wall thickness direction of the structural wall, which can be the first wall 23 of the housing assembly or other walls.

[0412] It should be noted that the insulating structural layer and composite material layer included in the structural wall can be integrally bonded together, or partially connected, forming gaps or cavities in some locations. Furthermore, the structural wall may also comprise one or more laminates, or different wall surfaces of the structural wall may be formed by bending a single laminate.

[0413] In this embodiment, the insulating structure layer can be made of a single material or a composite material, and the fiber composite material layer is made of a composite material. A composite material refers to a composite material composed of two or more materials with different physical or chemical properties.

[0414] In some examples, the composite material includes a substrate and auxiliary materials. The substrate encapsulates, supports, and connects the auxiliary materials, which in turn enhance chemical or physical properties such as structural strength and insulation. The auxiliary materials are pre-impregnated in the substrate and form a structural layer.

[0415] In this embodiment, the first wall 23 is provided with an insulating structure layer on the inner side of the cavity, or the first wall 23 is provided with an insulating structure layer on a portion of the inner side of the cavity. It is understood that the insulating layer provided as a whole has a better insulation effect.

[0416] In the technical solution provided in this application embodiment, the housing assembly can accommodate the battery cell 12 and provide protection and limiting for the battery cell 12. The first wall 23 of the housing assembly can support the battery cell 12 and provide support for the battery cell 12.

[0417] Based on this, the first wall 23 includes a stacked insulating structure layer and a fiber composite material layer. The fiber composite material layer provides good structural strength. Along the thickness direction of the first wall 23, the insulating structure layer is located between the fiber composite material layer and the battery cell 12. The insulating structure layer is made of insulating material. The insulating structure layer not only supports the battery cell 12, but also electrically isolates the battery cell 12 from the outside world, reducing external interference to the battery cell 12. The combination of the insulating structure layer and the fiber composite material layer allows the housing assembly to take into account both structural strength and protective performance.

[0418] In some embodiments, the insulating structure layer includes a fourth substrate and a plurality of fourth fibers, wherein the fourth fibers are continuous fibers and at least a portion of the plurality of fourth fibers intersect each other.

[0419] The fourth substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the fourth fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or,

[0420] The fiber composite layer includes a fifth substrate and multiple fifth fibers, wherein the fifth fibers are continuous fibers and at least some of the fifth fibers intersect each other;

[0421] The fifth substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the fifth fiber includes at least one of carbon fiber and polyethylene fiber.

[0422] In some embodiments, please refer to Figures 8 to 12 The electrical device 1000 includes a nacelle housing 1100 and a battery device 100 disposed within the nacelle housing 1100. The nacelle housing 1100 has a first channel 1110 and a second channel 1120. One end of the first channel 1110 is connected to the outside of the nacelle housing 1100, and the other end is connected to a first air vent 311. One end of the second channel 1120 is connected to the outside of the nacelle housing 1100, and the other end is connected to a second air vent 312. A guide 1130 is provided on the side wall of the end of the first channel 1110 away from the first air vent 311. The guide 1130 is used to guide the heat exchange medium into the first channel 1110.

[0423] In other words, the first channel 1110 and the second channel 1120 are used to introduce natural wind from outside the cabin into the air-cooled assembly 30.

[0424] In some embodiments, please refer to Figures 8 to 12 The guide member 1130 has a guide surface, and the angle between the central axis of the first channel 1110 and the guide surface is greater than or equal to 45° and less than or equal to 75°.

[0425] This helps to increase the amount of natural wind entering the air-cooled component 30 during the movement of the electrical device 1000.

[0426] In one specific embodiment, please refer to Figures 2 to 7The battery device 100 includes a housing assembly and a plurality of battery cells 12. The housing assembly includes a housing body 20 and an air-cooling assembly 30. The housing body 20 has a first wall 23, on which the plurality of battery cells 12 are supported. The air-cooling assembly 30 is disposed on the side of the first wall 23 away from the battery cell assembly 10, and an air-cooling chamber 40 is formed between the air-cooling assembly 30 and the first wall 23. The air-cooling assembly 30 includes a protective plate 31, which has a first air vent 311 and a second air vent 312. The air-cooling assembly 30 includes current collectors 32, which include a first current collector 321 and a second current collector 322. The first current collector 321 and the protective plate 31 form a first current collector cavity 323; the second current collector 322 and the protective plate 31 form a second current collector cavity 323. The second air collection cavity 323 is connected to the outside of the housing assembly through the second air outlet 312, and the second air collection cavity 323 is connected to the air-cooled chamber 40. The protective plate 31 includes a plate body 314 and a flange structure 315, which is connected to the housing body 20. The first air outlet 311 is located at the end region of the protective plate 31 along the second direction. There are multiple first air outlets 311. The air-cooled assembly 30 also includes multiple exhaust ports 3261. The first air outlet 311 is an air inlet, and the second air outlet 312 is an air outlet. The air collection member 32 has a protrusion in the direction away from the first air outlet 311, and the protrusion and the protective plate 31 form the first air collection cavity 323. At least two sub-outlets 329 are located on both sides of the first air outlet 311 along the first direction. The sub-outlets 329 are circular holes. The area of ​​the air intake 32 opposite to the first air outlet 311 is the air-facing portion 326. Projecting along the axial direction of the first air outlet 311, the projection of the air-facing portion 326 overlaps the projection of the first air outlet 311. The air-facing portion 326 is a panel perpendicular to the axial direction of the first air outlet 311. The air-facing portion 326 includes an exhaust port 3261. The air intake 32 also includes a diverting portion 327, with sub-outlets 329 distributed within it. The diverting portion 327 extends along a first direction. The air-facing portion 326 is located in the direction of the diverting portion 327 towards the center of the protective plate 31. The first and second air intake cavities 323 are located at opposite ends of the protective plate 31 along a second direction. The first and second air intake components 321 and 322 are symmetrical. Projecting along the thickness direction of the protective plate 31, the projections of the air-cooled chamber 40 overlap with both the first and second air intake cavities 323. The air-cooled chamber 40 includes air-cooled flow channels 41, which are connected to the first and second flow collection chambers 323, and the air-cooled flow channels 41 are spaced apart. The housing assembly also includes a partition 50, which is disposed between the air-cooled assembly 30 and the first wall 23 and abuts against the air-cooled assembly 30 and the first wall 23.

[0427] In one specific embodiment, please refer to Figures 8 to 13The battery device 100 includes a housing assembly and individual battery cells 12. The housing assembly includes a housing body 20 and an air-cooling assembly 30. The housing body 20 has a first wall 23, on which multiple battery cells 12 are supported. The air-cooling assembly 30 is disposed on the side of the first wall 23 away from the battery cell assembly 10, forming an air-cooling chamber 40 between the air-cooling assembly 30 and the first wall 23. The air-cooling assembly 30 includes a protective plate 31, which has a first air vent 311 and a second air vent 312. The air-cooling assembly 30 also includes a current collector 32, which is disposed between the protective plate 31 and the housing body 20, forming a first current collector cavity 323 with the protective plate 31. The current collector 32 has multiple sub-current outlets 329. The first current collector cavity 323 is connected to the outside of the housing assembly through the first air vent 311, and the sub-current outlets 329 connect the first current collector cavity 323 and the air-cooling chamber 40. The air-cooled assembly 30 is located at the bottom of the housing body 20 along its height. A second air vent 312 is provided on the protective plate 31. A collector 32 and the protective plate 31 form a second collector cavity 323. A sub-outlet 329 connects the second collector cavity 323 and the air-cooled chamber 40. The protective plate 31 includes a main body 314 and a flanged structure 315, which connects to the housing body 20. A first air vent 311 is located in the middle region of the protective plate 31. The air-cooled assembly 30 also includes a second air vent 312, located in the edge region of the protective plate 31. The first air vent 311 is an air inlet, and the second air vent 312 is an air outlet. The area of ​​the collector 32 opposite to the first air vent 311 is the windward portion 326, which projects along the axial direction of the first air vent 311, and the projection of the windward portion 326 covers the projection of the first air vent 311. The windward section 326 includes an exhaust port 3261. The flow collector 32 also includes a flow divider 327, with sub-flow ports 329 distributed in the flow divider 327. The flow divider 327 is arranged around the windward section 326. A second flow collector 323 is arranged around the first flow collector 323. The flow collector 32 and the protective plate 31 form the first flow collector 323 and the second flow collector 323. The flow collector 32 includes a first region 324 and a second region 325. The first region 324 and the protective plate 31 form the first flow collector 323, and the second region 325 and the protective plate 31 form the second flow collector 323. A spacer 328 is provided between the first region 324 and the second region 325, and the spacer 328 is sealed to the protective plate 31. The second region 325 is arranged around the first region 324. Along the thickness direction of the current collector 32, the current collector 32 has a first surface and a second surface. The first surface and the protective plate 31 form a first current collection cavity 323, and the second surface and the box body 20 form an air-cooled chamber 40.

[0428] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure, as well as the features of the different embodiments or examples, without contradiction.

[0429] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A battery device, characterized by, The battery device includes a housing assembly and multiple individual battery cells, the housing assembly comprising: A housing body, the housing body having a first wall, the plurality of battery cells being supported on the first wall; An air-cooled assembly is disposed on the side of the first wall opposite to the battery cell, and the air-cooled assembly is used to form an air-cooled chamber for heat exchange with the first wall; wherein... The housing assembly is provided with a first air vent and a second air vent that communicate with the air-cooled chamber.

2. The battery device according to claim 1, characterized by The air-cooling component forms the air-cooling chamber between itself and the first wall.

3. The battery device of claim 1, wherein The air-cooling assembly forms the air-cooling chamber, and the air-cooling assembly is heat-exchange connected to the first wall.

4. The battery device of claim 1, wherein The air-cooling assembly includes a protective plate and a collector. The protective plate is provided with at least a first air outlet. The collector is disposed between the protective plate and the first wall, and forms a collector cavity with the protective plate. The collector is provided with multiple sub-outlets, each of which connects the air-cooling chamber and the collector cavity. The first air outlet is connected to the collector cavity.

5. The battery device of claim 4, wherein, At least one of the current collector and the protective plate includes a first protrusion, the first protrusion forming the current collection cavity, and the sub-flow outlet is disposed on the first protrusion.

6. The battery device of claim 4, wherein Projecting along the thickness direction of the first wall onto the same projection plane, the projection of the sub-flow outlet does not overlap with the projection of the first air outlet.

7. The battery device of claim 4, wherein At least two of the sub-outlets are located on either side of the first air outlet along a first direction, the first direction being perpendicular to the stacking direction of the battery cells; The distance between one of the sub-flow outlets located on both sides of the first air outlet along the first direction and the first air outlet is L1, and the distance between the other sub-flow outlet and the first air outlet is L2, where 0≤L1-L2≤10mm.

8. The battery device of claim 4, wherein Along the stacking direction of the battery cells, the sub-outlet is closer to the edge of the housing assembly than the first air vent.

9. The battery device of claim 4, wherein, The flow collector includes a flow divider and a windward section, with the sub-flow outlets distributed in the flow divider; the projection of the windward section along the axial direction of the first air outlet covers the projection of the first air outlet.

10. The battery device of claim 9, wherein, The flow collector also includes an exhaust port, which is distributed in the windward part. The opening area of ​​each sub-flow port is larger than the opening area of ​​each exhaust port, and each exhaust port is arranged opposite to the first air passage or the second air passage.

11. The battery device of claim 10, wherein, The ratio of the total cross-sectional area of ​​the exhaust port opposite to the first air inlet to the total cross-sectional area of ​​the first air inlet is greater than or equal to one-fifth and less than or equal to one-quarter.

12. The battery device of claim 9, wherein, The current-diverting section extends along a first direction, and the windward section is located in the direction of the current-diverting section toward the center of the protective plate, wherein the first direction is perpendicular to the stacking direction of the battery cells; or... The diverter is arranged around the windward section.

13. The battery device of claim 4, wherein, The protective plate is provided with a first air outlet and a second air outlet. The current collection component includes a first current collection component and a second current collection component. The current collection cavity includes a first current collection cavity and a second current collection cavity. The first current collection component is provided with a first sub-flow port, and the second current collection component is provided with a second sub-flow port. The first current collection component and the protective plate form the first current collection cavity, and the second current collection component and the protective plate form the second current collection cavity. The first current collection cavity is connected to the air-cooled chamber through the first sub-flow port, and the second current collection cavity is connected to the air-cooled chamber through the second sub-flow port.

14. The battery device of claim 13, wherein, The first current collector and the second current collector are located at both ends of the protective plate along a second direction, which is parallel to the stacking direction of the battery cells.

15. The battery device of claim 13, wherein, The first current collector and the second current collector are symmetrical components.

16. The battery device of claim 4, wherein, The flow collection cavity includes a first flow collection cavity and a second flow collection cavity. The flow collection component includes a first region and a second region. The first region and the protective plate form the first flow collection cavity, and the second region and the protective plate form the second flow collection cavity. A spacer is provided between the first region and the second region, and the spacer abuts against the protective plate.

17. The battery device of claim 16, wherein, The second zone surrounds the first zone.

18. The battery device of any one of claims 1-17, wherein, Each of the battery cells has a pressure relief section, and each of the battery cells is arranged such that the pressure relief section faces the first wall. The first wall is provided with a plurality of pressure relief structures, which are projected onto the same projection plane along the thickness direction of the first wall. The projection of each pressure relief section is located within the projection of the corresponding pressure relief structure.

19. The battery device of claim 18, wherein, The air-cooled chamber includes an air-cooled flow channel and a pressure relief chamber. The pressure relief chamber is correspondingly arranged with the pressure relief structure. The air-cooled flow channel is connected to both the first air outlet and the second air outlet.

20. The battery device of claim 19, wherein, The pressure relief chamber is disposed adjacent to the air-cooled flow channel; and / or, The pressure relief chamber extends along a second direction, which is parallel to the stacking direction of the battery cells.

21. The battery device of claim 18, wherein, The battery device further includes a heat-absorbing component, which is disposed in the air-cooled chamber and is positioned opposite to the pressure relief portion of the battery cell in the air-cooled component.

22. The battery device according to claim 21, characterized in that, The heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

23. The battery device of claim 22, wherein, The heat-absorbing component also includes a heat-conducting layer, which is stacked with the phase change layer. Along the stacking direction, the heat-conducting layer is located at least on the side of the phase change layer closest to the pressure relief section.

24. The battery device of claim 21, wherein, A partition is provided between the first wall and the air-cooling component. The partition abuts against the first wall and the air-cooling component respectively to define a pressure relief chamber. The heat absorption component is located in the pressure relief chamber. The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber to the first air vent and / or the second air vent.

25. The battery device of claim 19, wherein, The housing assembly also includes a partition, which is located between the first wall and the air-cooling assembly and abuts against the first wall and the air-cooling assembly, thereby defining the pressure relief chamber and the air-cooling flow channel; The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber to the first air vent and / or the second air vent.

26. The battery device of claim 25, wherein, The separator includes a first wall and a second wall disposed opposite to each other, the first wall forming the cavity wall of the air-cooled flow channel, and the second wall forming at least a portion of the intermediate cavity wall of the pressure relief cavity.

27. The battery device of claim 25, wherein, The separator at least defines the cavity wall between the first wall and the protective plate where the pressure relief chamber is located.

28. The battery device of claim 27, wherein, The air-cooling flow channel is defined between two adjacent separators.

29. The battery device of claim 27, wherein, The separator includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in sequence. The first sidewall and the third sidewall are arranged opposite each other along a first direction, and the second sidewall and the fourth sidewall are arranged opposite each other along a second direction. The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall form the intermediate cavity wall of the pressure relief chamber located between the first wall and the protective plate. The first direction and the second direction are perpendicular to the thickness direction of the protective plate.

30. The battery device of claim 29, wherein, The wall thickness of at least one of the first sidewall and the third sidewall is less than the wall thickness of the second sidewall and the fourth sidewall.

31. The battery device of claim 29, wherein, The pressure relief structure extends along the second direction, and the second sidewall and the fourth sidewall are respectively disposed on both sides of the pressure relief structure along the first direction.

32. The battery device of claim 28, wherein, The air-cooled chamber is provided with a boss structure, which protrudes from the air-cooled assembly toward the battery cell, and the top wall of the boss structure forms the cavity wall of the air-cooled flow channel.

33. The battery device according to claim 32, characterized in that, The boss structure is located between two adjacent separators.

34. The battery device of any one of claims 1-17, wherein, The air-cooled chamber is provided with a boss structure, which protrudes from the air-cooled assembly toward the battery cell.

35. The battery device of claim 34, wherein, Multiple battery cells are stacked to form a battery cell group, and the boss structure is located at the bottom of the battery cell group and extends along the stacking direction.

36. The battery device of claim 34, wherein, The air-cooled component has a protrusion on the side facing the battery cell, and the protrusion structure is the protrusion.

37. The battery device of claim 34, wherein, The distance between the top wall of the boss structure facing the battery cell and the first wall is 5mm-10mm.

38. The battery device of claim 34, wherein, The protrusion of the boss structure from the air-cooling assembly toward the battery cell has a dimension of 5mm-10mm.

39. The battery device of any one of claims 4-17, wherein, The protective plate comprises a fiber-reinforced composite material laminate structure; and / or, The current collector includes a fiber-reinforced composite material laminate structure; and / or, The current collector includes a metal component.

40. The battery device of any one of claims 4-17, wherein, The protective plate is sealed to the box body.

41. The battery device of any one of claims 1-17, wherein, The box body comprises a fiber-reinforced composite material laminate structure.

42. An electrical device, comprising: Includes the battery device according to any one of claims 1 to 41.

43. The electrical appliance according to claim 42, characterized in that, The electrical equipment includes aircraft.

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