Battery device and electric device

Abstract

The utility model discloses a battery device and an electric device. The battery device comprises a first box body, a second box body, a battery cell assembly and a heat management part. And the second box body is a die casting. The second box body and the first box body are connected and share a containing cavity. The second box body is provided with a first wall, the first wall is provided with a first surface forming a containing cavity, and a first groove is formed in the first surface. The battery monomer assembly is arranged in the accommodating cavity; and at least part of the heat management component is arranged in the first groove, and the heat management component is used for adjusting the temperature of the battery monomer assembly. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery device and an electrical device. Background Art

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

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] The present application provides a battery device and an electrical device, and the technical solution provided by the present application can effectively improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, which includes a first box body, a second box body, a battery cell assembly, and a thermal management component. The second box body is a die-cast part. The second box body is connected to the first box body and they jointly form a receiving cavity. The second box body has a first wall, and the first wall has a first surface that forms the receiving cavity. A first groove is formed on the first surface. The battery cell assembly is disposed in the receiving cavity. At least part of the thermal management component is disposed in the first groove, and the thermal management component is used to adjust the temperature of the battery cell assembly.

[0006] In the above solution, by forming the first groove in the first wall to accommodate the thermal management component, the thermal management component can reasonably utilize the space on the wall thickness of the first wall, reducing the volume of the battery device while being able to adjust the temperature of the battery cell assembly, which is beneficial to improving the volume energy density of the battery device. Among them, the second box body is made by die-casting process. On the one hand, it makes the manufacturing efficiency of the second box body high and the structural strength high, that is, it is beneficial to improve the manufacturing efficiency and reliability of the battery device; on the other hand, it can also make the inner R angle of the first groove smaller compared with other forming processes, reducing the risk that the thermal management component interferes with the inner R angle of the first groove, resulting in damage to the thermal management component and affecting the thermal management effect, and thus being beneficial to improving the reliability of the battery device.

[0007] According to some embodiments of the present application, the first groove includes a groove bottom surface and a groove side surface, and the groove bottom surface and the groove side surface are transitioned by a first rounded corner, and the radius of the first rounded corner is not greater than 3 mm.

[0008] In the above solution, since the first groove is formed by die-casting, the radius of the first fillet of the first groove is not greater than 3 mm, which can effectively reduce the risk of interference between the thermal management component and the wall of the first groove. On the one hand, it can effectively improve the space utilization rate of the thermal management component and increase the volume energy density of the battery device; on the other hand, it reduces the risk that the structure of the thermal management component is damaged due to interference with the wall of the first groove, affecting the thermal management efficiency, which is conducive to improving the reliability of the battery device.

[0009] According to some embodiments of the present application, the radius of the first fillet is not less than 1 mm.

[0010] In the above solution, by setting the radius of the first fillet to be not less than 1 mm and not greater than 3 mm, on the one hand, it can effectively improve the space utilization rate of the thermal management component and increase the volume energy density of the battery device; on the other hand, it reduces the risk that the structure of the thermal management component is damaged due to interference with the wall of the first groove, affecting the thermal management efficiency, which is conducive to improving the reliability of the battery device; on the other hand, since the second box body is a die-casting part, setting the radius of the first fillet to be not less than 1 mm can reduce the risk of damage to the die-casting mold, which is beneficial to improving the service life of the die-casting mold, thereby reducing the manufacturing cost of the battery device.

[0011] According to some embodiments of the present application, the first surface and the side surface of the first groove are transitioned by a second fillet, and the radius of the second fillet is not less than 0.5 mm and not greater than 2 mm.

[0012] In the above solution, the first surface and the side surface of the first groove are transitioned by a second fillet, and the radius of the second fillet is not less than 0.5 mm and not greater than 2 mm. On the one hand, it can make the distance between the thermal management component and the side surface of the first groove relatively small, which is beneficial to improving the integration degree of the thermal management component and the first wall, thereby being conducive to increasing the volume energy density of the battery device; on the other hand, the thermal management component and the first groove are connected by a gluing process. Since the distance between the management component and the side surface of the first groove is relatively small, the amount of glue applied can be effectively reduced, so as to reduce the cost and be beneficial to the improvement of the mass energy density of the battery device; on the other hand, through the transition of the second fillet, the risk of damage to the die-casting mold can be reduced, which is beneficial to improving the service life of the die-casting mold, thereby reducing the manufacturing cost of the battery device.

[0013] According to some embodiments of the present application, the thermal management component has a second surface facing the side surface of the first groove, and the minimum distance between the second surface and the side surface is not less than 1 mm and not greater than 3 mm.

[0014] In the above solution, in the direction pointing from the second surface to the side surface of the groove, the size of the heat management component can be smaller than the size of the first groove. For example, the minimum distance between the heat management component and the side surface of the groove is set to be not less than 1 mm and not more than 3 mm. On the one hand, it can reduce the risk of interference between the heat management component and the first groove, which is beneficial to improving the assembly efficiency of the heat management component in the first groove; on the other hand, it can control the amount of glue applied between the heat management component and the first groove, so as to reduce costs and is beneficial to improving the mass energy density of the battery device.

[0015] According to some embodiments of the present application, an adhesive layer is provided between the heat management component and the bottom surface of the groove, and the thickness of the adhesive layer is not less than 0.2 mm and not more than 1.5 mm.

[0016] In the above solution, the heat management component is fixed in the first groove through the adhesive layer, and can stably exchange heat with the battery cell assembly, thereby effectively regulating the temperature of the battery cell assembly, which is beneficial to improving the reliability of the battery device; at the same time, the thickness of the adhesive layer is set to be not less than 0.2 mm and not more than 1.5 mm. On the one hand, it can reduce the risk that the adhesive layer is too thin to effectively fix the heat management component in the first groove, resulting in the first groove detaching from the first groove and causing heat management failure; on the other hand, it can reduce the risk of increasing the manufacturing material cost of the battery device and reducing the mass energy density of the battery device due to the too thick adhesive layer.

[0017] According to some embodiments of the present application, a flow channel is formed inside the heat management component, and the flow channel is used to accommodate the medium. The heat management component includes a current collector and a body connected to each other. The current collector has an inlet and an outlet, and the inlet and outlet communicate with the flow channel, and the body is disposed in the first groove.

[0018] In the above solution, a flow channel is formed inside the heat management component, and is connected to an external medium storage device through the body, and can stably supply the medium to the flow channel inside the body, thereby effectively exchanging heat with the battery cell assembly to effectively regulate the temperature of the battery cell assembly, which is beneficial to improving the reliability of the battery device.

[0019] According to some embodiments of the present application, the body has a third surface facing away from the bottom surface of the first groove. In the direction pointing from the first wall to the battery cell assembly, the third surface does not protrude beyond the first surface.

[0020] In the above solution, the body of the heat management component can be embedded in the first groove and does not protrude beyond the first surface of the first wall. On the one hand, it can improve the integration degree of the first wall and the heat management component, which is beneficial to improving the volume energy density of the battery device; on the other hand, it can effectively reduce the interference of the heat management component on the battery cell assembly, and reduce the risk of structural damage to the battery cell assembly or the heat management component due to mutual interference, making the battery device highly reliable.

[0021] According to some embodiments of the present application, along a first direction, the current collector is located on one side of the body. The body includes a first part and a second part arranged in sequence along a second direction. The first part and the second part are connected in parallel to the current collector. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

[0022] In the above solution, by providing the first part and the second part connected in parallel, heat exchange can be carried out separately with the battery cell components, effectively improving the heat exchange efficiency of the heat management component, efficiently adjusting the temperature of the battery cell components, enabling the battery cell components to quickly be in a suitable temperature environment, facilitating the improvement of the charge and discharge performance of the battery device, and facilitating the improvement of the reliability of the battery device.

[0023] According to some embodiments of the present application, the first part includes a first connection section, a second connection section, a third connection section, and a first straight section. A plurality of first straight sections are arranged along the second direction. The plurality of first straight sections are connected by the third connection section. The first connection section and the second connection section are arranged along the first direction and are respectively connected to the current collector. One end of the first connection section facing away from the current collector is connected to one of the plurality of first straight sections, and one end of the second connection section facing away from the current collector is connected to another one of the plurality of first straight sections.

[0024] In the above solution, the first part includes a cold plate formed by multiple sections of structures in a snake shape. On the one hand, it can increase the heat exchange area with the battery cell components, facilitating the improvement of heat management efficiency. On the other hand, it can make the heat management component small in volume, facilitating the control of the material cost of the heat management component, and also facilitating the improvement of the volume energy density of the battery device.

[0025] According to some embodiments of the present application, the second part includes a fourth connection section, a fifth connection section, a sixth connection section, and a second straight section. A plurality of second straight sections are arranged along the second direction. The plurality of second straight sections are connected by the sixth connection section. The fourth connection section and the fifth connection section are arranged along the first direction and are respectively connected to the current collector. One end of the fourth connection section facing away from the current collector is connected to one of the plurality of second straight sections, and one end of the fifth connection section facing away from the current collector is connected to another one of the plurality of second straight sections.

[0026] In the above solution, the second part includes a cold plate formed by multiple sections of structures in a snake shape. On the one hand, it can increase the heat exchange area with the battery cell components, facilitating the improvement of heat management efficiency. On the other hand, it can make the heat management component small in volume, facilitating the control of the material cost of the heat management component, and also facilitating the improvement of the volume energy density of the battery device.

[0027] According to some embodiments of the present application, the first wall is formed with a second groove, the second groove communicates with the first groove, the current collector is disposed in the second groove, and the current collector is connected to the first wall at an equal potential.

[0028] In the above scheme, the first wall is formed with a second groove, which, on the one hand, can play the role of positioning and assembling the current collector, which is beneficial to the efficiency of assembling the thermal management component on the first wall; on the other hand, it can reduce the interference of the current collector on the internal structural parts of the battery device, which is beneficial to improve the internal space utilization of the battery device, so that the volume energy density of the battery device is high.

[0029] According to some embodiments of the present application, a first connection portion and a second connection portion are provided on the first surface, the first connection portion and the second connection portion are spaced apart along a first direction, a battery cell assembly is provided between the first connection portion and the second connection portion, and the first connection portion and the second connection portion are respectively connected to the battery cell assembly. Along the first direction, the current collector is provided on a side of the first connection portion away from the second connection portion, and the first direction is perpendicular to the thickness direction of the first wall.

[0030] In the above scheme, by arranging the first connecting part and the second connecting part spaced apart from each other along the first direction on the first surface, the position of the battery cell assembly in the first direction can be effectively limited, and the battery cell assembly can be effectively fixed, so that the structural stability of the battery device is high, which is beneficial to the improvement of the reliability of the battery device; at the same time, arranging the current collector on the outside of the first connecting part can reduce the risk of medium leakage at the connection between the main body and the current collector and at the connection between the external medium storage device and the current collector, which may affect the battery cell assembly, resulting in the risk of the battery cell assembly being corroded by the medium or the battery cell assembly being short-circuited internally, which is beneficial to the improvement of the reliability of the battery device.

[0031] According to some embodiments of the present application, the first connecting portion includes a plurality of first connecting members arranged at intervals along the second direction, the first connecting members are connected to the battery cell assembly, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0032] In the above scheme, by providing a plurality of first connectors spaced apart along the second direction, it is possible to effectively connect to the battery cell assembly, thereby facilitating the stability of the battery cell assembly in the box, reducing the risk of circuit disconnection caused by misalignment of the battery cell assembly due to external impact, and improving the reliability of the battery device.

[0033] According to some embodiments of the present application, the second box body also includes a second wall and a third wall, which are respectively connected to the first wall. The second wall and the third wall are oppositely arranged along the first direction, and the battery monomer assembly is located between the second wall and the third wall.

[0034] In the above scheme, by providing the second wall and the third wall arranged opposite to each other along the first direction, the influence of external impact from the second direction on the battery cell assembly can be effectively reduced, the impact resistance energy of the battery device is improved, and the reliability of the battery device is improved.

[0035] According to some embodiments of the present application, the battery device further includes a connector, the connector is electrically connected to the battery cell assembly, the second wall is formed with a first through hole, and the connector is installed in the first through hole.

[0036] In the above solution, by providing the first through hole in the second wall, the connector can pass through to electrically connect the battery device to the external electrical device body.

[0037] According to some embodiments of the present application, the battery device further includes a pressure relief mechanism, the second wall is formed with a second through hole, and the pressure relief mechanism is installed in the second through hole.

[0038] In the above solution, by providing the second through hole in the second wall to install the pressure relief mechanism, the pressure inside the battery device can be effectively discharged, reducing the risk of thermal runaway or explosion of the battery device, which is beneficial to improving the reliability of the battery device.

[0039] According to some embodiments of the present application, the first box body includes a fourth wall, a fifth wall and a sixth wall. Along the thickness direction of the first wall, the fourth wall and the first wall are arranged opposite to each other, the fourth wall connects the fifth wall and the sixth wall, the fifth wall and the sixth wall are arranged opposite to each other along the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other in pairs.

[0040] According to some embodiments of the present application, along the second direction, the two outer side surfaces of the first wall opposite to each other are respectively connected to the fifth wall and the sixth wall.

[0041] In the above solution, the fifth wall and the sixth wall are respectively connected to the outer side surface of the first wall, so that the connection surface between the first box body and the second box body is perpendicular to the horizontal plane, which can reduce the horizontal occupancy of the battery device to improve the space utilization rate of the battery device, and is beneficial to improving the endurance of the electrical device.

[0042] In a second aspect, some embodiments of the present application further provide an electrical device, including the battery device provided in the first aspect, and the battery device is used to provide electrical energy.

[0043] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1Schematic structural diagram of a vehicle in some embodiments of the present application;

[0046] Figure 2 Exploded perspective view of a battery device in some embodiments of the present application;

[0047] Figure 3 Schematic diagram of a partial structure of a heat management component and a second box body in some embodiments of the present application;

[0048] Figure 4 Is Figure 3 Cross-sectional view taken along the A-A viewing direction in

[0049] Figure 5 Is Figure 4 Enlarged view at B in

[0050] Figure 6 Internal schematic diagram of a partial structure of a second box body in some embodiments of the present application;

[0051] Figure 7 Exploded perspective view of a second box body and a heat management component in some embodiments of the present application;

[0052] Figure 8 Schematic structural diagram of a heat management component in some embodiments of the present application;

[0053] Figure 9 Schematic diagram of a second box body in some embodiments of the present application.

[0054] Icons: 1000 - vehicle; 100 - battery device; 200 - controller; 300 - motor; 10 - box body; 11 - first box body; 110 - fourth wall; 111 - fifth wall; 112 - sixth wall; 12 - second box body; 120 - first wall; 1200 - first surface; 121 - second wall; 1210 - first through hole; 1211 - second through hole; 122 - third wall; 20 - battery cell assembly; 21 - battery cell; 30 - heat management component; 30a - second surface; 30b - flow channel; 31 - current collector; 32 - body; 32a - third surface; 320 - first part; 3200 - first connection segment; 3201 - second connection segment; 3202 - third connection segment; 3203 - first straight segment; 321 - second part; 3210 - fourth connection segment; 3211 - fifth connection segment; 3212 - sixth connection segment; 3213 - second straight segment; 40 - first groove; 41 - groove bottom surface; 42 - groove side surface; 43 - first fillet; 44 - second fillet; 50 - adhesive layer; 60 - second groove; 71 - first connection part; 710 - first connecting piece; 72 - second connection part; x - first direction; y - second direction; z - thickness direction of the first wall. Detailed implementation manners

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0057] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0058] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0060] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0061] In this application, "a plurality of" means two or more (including two).

[0062] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so that the active material can be reused.

[0063] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application do not limit this.

[0064] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0065] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0067] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0068] In some embodiments, the separator is a separator membrane. The types of separator membranes can be various, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0069] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0070] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a stacked structure.

[0072] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be respectively provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0073] As an example, multiple positive electrode sheets may be provided. The negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0074] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0075] As an example, multiple separators may be provided and are respectively disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0076] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode sheet or negative electrode sheet by means of folding or winding.

[0077] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0078] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0079] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0080] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0081] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, and the multiple battery cells are connected in series, parallel, or in a series-parallel combination through a current collecting component.

[0082] In some embodiments, the battery cell assembly is generally formed by arranging multiple battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by tying multiple battery cells with a cable tie.

[0083] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0084] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0085] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0086] As an example, the box can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0087] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0088] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beam and longitudinal beam of the vehicle.

[0089] In some embodiments, the battery device can refer to an energy storage device, and the energy storage device includes a box, and at least one side of the box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0090] Exemplarily, the battery device includes a beam assembly and a battery cell assembly. The beam assembly can include a hanging beam and a mounting beam arranged in parallel. The mounting beam is used to install and fix the battery cell assembly, and the hanging beam is used to hang the battery on the body of the electrical device so that the battery supplies power to the body of the electrical device. Among them, in some embodiments, the beam assembly can be part of the structural members of the box.

[0091] The battery device has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptation range, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider various design factors at the same time, such as performance parameters such as cycle life, discharge capacity, charge and discharge rate, etc. In addition, the energy density and reliability of the battery device also need to be considered.

[0092] In battery technology, a large amount of heat is generated in the battery cell components within a battery device during continuous charge and discharge processes. In related technologies, to reduce the safety hazards caused by internal temperature rise during the use of the battery device, a thermal management component for heat exchange with the battery cell components is usually provided to regulate the temperature of the battery cells, thereby alleviating the phenomenon of temperature rise inside the battery. However, the thermal management component occupies the internal space of the battery device, affecting the volumetric energy density of the battery device. In current related technologies, grooves are stamped on the wall of the box body so that the thermal management component is embedded in the grooves, reducing the occupation of the internal space of the box body by the thermal management component, thereby increasing the energy density. However, due to the stamping process, the inner R angle of the groove is relatively large, and the thermal management component interferes with the wall of the groove, affecting the assembly efficiency and posing a risk of damage to the thermal management component due to interference. For example, it is likely to cause leakage of the heat exchange medium in the thermal management component, thus affecting the heat exchange efficiency and further affecting the reliability of the battery device.

[0093] In view of this, to effectively improve the space utilization rate of the internal structural components of the battery device and improve the reliability of the battery device, some embodiments of the present application provide a battery device, which includes a first box body, a second box body, a battery cell group, and a thermal management component. The second box body is a die-cast part. The second box body is connected to the first box body and they jointly form a receiving cavity. The second box body has a first wall, and the first wall has a first surface forming the receiving cavity, and a first groove is formed on the first surface. The battery cell components are arranged in the receiving cavity. At least part of the thermal management component is arranged in the first groove, and the thermal management component is used to regulate the temperature of the battery cell components.

[0094] In the above solution, by forming the first groove on the first wall to accommodate the thermal management component, the thermal management component can reasonably utilize the space on the wall thickness of the first wall, streamline the volume of the battery device while being able to regulate the temperature of the battery cell components, which is beneficial to the improvement of the volumetric energy density of the battery device. Among them, the second box body is made by die-casting process. On the one hand, it enables the second box body to have high manufacturing efficiency and high structural strength, that is, it is beneficial to the improvement of the manufacturing efficiency and reliability of the battery device; on the other hand, it can also make the inner R angle of the first groove smaller compared to other forming processes, reducing the risk that the thermal management component interferes with the inner R angle of the first groove, resulting in damage to the thermal management component and affecting the thermal management effect, and thus being beneficial to the improvement of the reliability of the battery device.

[0095] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be formed by using the battery device disclosed in the present application. In this way, it is beneficial to alleviate the problem of short circuit occurring during the use of the battery device, improve the use reliability of the battery device, and is also beneficial to increasing the volumetric energy density of the battery device and extending the working time of the power-consuming device.

[0096] Embodiments of the present application provide an electrical device using a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0097] For the convenience of description, the following embodiments will take a vehicle as an example of an electrical device in an embodiment of the present application for illustration.

[0098] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 may be disposed at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0099] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a power source for the vehicle 1000, but also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Some embodiments of the present application provide a battery device 100. Please refer to Figures 2 - 6 , Figure 2 which is an exploded perspective view of the battery device 100 in some embodiments of the present application, Figure 3 which is a schematic diagram of a partial structure of the thermal management component 30 and the second box body 12 in some embodiments of the present application, Figure 4 is Figure 3 a cross-sectional view taken along the A-A viewing direction in Figure 5 is Figure 4 an enlarged view of part B in Figure 6 which is an internal schematic diagram of a partial structure of the second box body 12 in some embodiments of the present application. Among them, Figure 6 can also be regarded as a schematic diagram based on Figure 5 and hiding the thermal management component 30.

[0101] The battery device 100 includes a first box body 11, a second box body 12, a battery cell assembly 20, and a thermal management component 30. The second box body 12 is a die-cast part. The second box body 12 is connected to the first box body 11 and they jointly define a receiving cavity. The second box body 12 has a first wall 120, and the first wall 120 has a first surface 1200 that forms the receiving cavity. A first groove 40 is formed on the first surface 1200. The battery cell assembly 20 is disposed in the receiving cavity. At least part of the thermal management component 30 is disposed in the first groove 40, and the thermal management component 30 is used to adjust the temperature of the battery cell assembly 20.

[0102] The battery device 100 may include a box body 10 for providing a receiving cavity for the battery cell assembly 20, and the box body 10 may adopt various structures. Optionally, referring to Figure 2 As shown, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define a receiving cavity for accommodating the battery cell assembly 20. Optionally, the structures of the first box body 11 and the second box body 12 may be various. Exemplarily, in Figure 2 , both the first box body 11 and the second box body 12 are in a "U" - shaped structure, such that the first box body 11 and the second box body 12 covering each other can jointly define a receiving cavity. Of course, in other embodiments, the first box body 11 may also be a hollow structure with one end open, the second box body 12 may be a plate - shaped structure, and the second box body 12 covers the open side of the first box body 11 so that the first box body 11 and the second box body 12 jointly define a receiving cavity; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 may be in various shapes, such as a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 , the shape of the box body 10 formed by the first box body 11 and the second box body 12 is a cuboid.

[0103] In the battery device 100, the battery cell assembly 20 disposed in the box body 10 may be one or multiple. Each battery cell assembly 20 may include one or more battery cells 21. When including multiple battery cells 21, the multiple battery cells 21 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 21.

[0104] When there are multiple battery cell assemblies 20 disposed within the box body 10, the multiple battery cell assemblies 20 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cell assemblies 20. In some embodiments, the battery device 100 can further include other structures. For example, the battery can further include a busbar component for connecting the multiple battery cell assemblies 20 to achieve electrical connection among the multiple battery cell assemblies 20. The battery device 100 can also include a thermal management component 30, which can exchange heat with the battery cell assemblies 20 to regulate the temperature of the battery cell assemblies 20. The battery device 100 can also include a connector that can electrically connect the battery cell assemblies 20 to the outside to achieve input and output of electrical energy.

[0105] In some embodiments, the battery cell assembly 20 includes a plurality of stacked battery cells 21 and end plates. Along the stacking direction of the battery cells 21, the two end plates are respectively disposed at both ends of the plurality of battery cells 21, and cooperate with the side plates to fix the plurality of battery cells 21 into a whole. Among them, each battery cell 21 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 thereto. Optionally, the shape of the battery cell 21 can be various. For example, the battery cell 21 can be in the shape of a cuboid, a cylinder, a prism, or other shapes. Exemplarily, in Figure 2 it, the battery cell 21 has a cuboid structure.

[0106] The thermal management component 30 is used for heat exchange with the battery cell assembly 20 to adjust the temperature of the battery cell 21 in the battery cell assembly 20 so that the battery cell 21 is within a suitable temperature range to have good charge and discharge performance. In some embodiments, the thermal management component 30 can cool or heat the battery cell assembly 20. Optionally, the thermal management component 30 can be a heating component that heats the battery cell assembly 20 by resistive heating. Optionally, the thermal management component 30 has a flow channel 30b inside, and the flow channel 30b is used to store the medium so that the medium can exchange heat with the battery cell assembly 20 to manage the temperature of the battery cell 21, such as heating or cooling. Optionally, the medium can be a fluid, and the fluid can be a liquid or a gas. Exemplarily, the medium can be a gas, such as air or hydrogen, and the heat exchange medium can also be a liquid, such as water, a saline solution or liquid nitrogen. In some embodiments, the thermal management component 30 can be a cold plate. The cold plate has a flow channel 30b inside, and the cold plate is connected to an external pipe through an adapter or a current collector 31 to connect to the medium storage device of the power device body 32 to achieve the circulation of the medium. Optionally, the thermal management component 30 can be a large-sized cold plate with an overall flat surface, which can include two stacked plates, and the two plates can be provided with concave parts and / or convex parts to form a flow channel 30b for the medium to flow. For example, see Figure 3 The heat management component 30 may also be a plate-shaped pipeline arranged in a snake-like manner, and a flow channel 30b is formed in the pipeline for the medium to flow.

[0107] The first wall 120 is a structural member of the second box body 12. Optionally, the second box body 12 may only include the first wall 120. For example, the first box body 11 is a hood-like structure with an open end. The first wall 120 is a plate-like structure connected to the open end of the first box body 11 to form a receiving cavity together with the first box body 11. Optionally, the first wall 120 is a partial structure of the second box body 12. Figure 2 The second box body 12 includes a first wall 120, a second wall 121 and a third wall 122, and the second wall 121 and the third wall 122 are respectively connected to the first wall 120 to form a "U"-shaped structure.

[0108] In some embodiments, the first wall 120 may be the bottom wall of the box 10 and may support the battery cell assembly 20. In other embodiments, the first wall 120 may be the side wall of the box 10 and may be located on one circumferential side of the battery cell assembly 20.

[0109] The first surface 1200 may be the inner side surface of the first wall 120. The first surface 1200 and the inner side surfaces of other wall parts of the box body 10 together form an accommodation cavity. Exemplarily, when the first wall 120 is the bottom wall of the box body 10, the first surface 1200 may be the supporting surface of the battery cell assembly 20, or the surface facing the bottom of the battery cell assembly 20. The first groove 40 is a groove-like structure formed on the first surface 1200. The first groove 40 is used to accommodate at least a part of the heat management component 30, so that the heat management component 30 can be at least partially embedded in the first groove 40 to utilize the space in the thickness direction z of the first wall. Exemplarily, the heat management component 30 has a body 32. Along the thickness direction z of the first wall, the orthographic projection of the battery cell assembly 20 falls on the body 32, or the orthographic projection of the battery cell assembly 20 coincides with the orthographic projection of the body 32, or the body 32 of the heat management component 30 is the part that exchanges heat with the battery cell assembly 20. In some embodiments, the surface of the heat management component 30 facing away from the bottom of the first groove 40 is flush with the first surface 1200 to jointly support the battery cell assembly 20. In other embodiments, the surface of the heat management component 30 facing away from the bottom of the first groove 40 may be below the first surface 1200, so that the first surface 1200 can support the battery cell assembly 20.

[0110] In some embodiments, the connection relationship between the heat management component 30 and the first wall 120 is diverse, including but not limited to bonding, welding, snap connection, threaded connection or other connection relationships.

[0111] "The second box body 12 is a die-casting part" can be understood as that the entire second box body 12 is a die-casting part and is made by die-casting process, that is, the first groove 40 is also formed in the die-casting process. Exemplarily, die-casting is a precision casting method that uses high pressure to force molten metal into a metal mold with a complex shape. The castings manufactured by die-casting method can be called die castings.

[0112] In the related art, the first groove 40 can also be formed by stamping on the first surface 1200 of the first wall 120 after the second box body 12 is formed. However, in some embodiments of the present application, the first groove 40 is formed when the second box body 12 is die-cast. The obvious difference is that the inner R angle of the groove formed by stamping is larger, while the inner R angle of the first groove 40 formed by die-casting is smaller.

[0113] In some embodiments, see Figure 5 and Figure 6, on the side of the first wall 120 facing away from the battery cell assembly 20, a convex portion may be formed at a position corresponding to the first groove 40, and a groove may be formed between two adjacent convex portions. That is, the first wall 120 forms protrusions and recesses on the first surface 1200 through a plurality of concave-convex structures, and convex portions and recesses are formed on the side facing away from the first surface 1200, so that the amount of the constituent material of the first wall 120 is uniform. On the one hand, the structural strength of the first wall 120 can be improved, on the other hand, materials can be saved, and the mass of the first wall 120 can be reduced.

[0114] In some embodiments, the main body portion of the thermal management component 30 may be disposed in the first groove 40. The main body portion of the thermal management component 30 may refer to the portion for heat exchange with the battery cell assembly 20. Other portions of the thermal management component 30 may be used to provide energy or medium for heating or cooling the battery cell assembly 20 to the main body. Exemplarily, the thermal management component 30 exchanges heat with the battery cell assembly 20 through a medium, and the medium may be a fluid, such as a gas or a liquid. The other portions of the thermal management component 30 described above may be a pipeline structure or other structures for providing the medium to the main body portion. Additionally, exemplarily, the thermal management component 30 heats the battery cell assembly 20 by resistance heating to adjust the temperature of the battery cell assembly 20. The other portions of the thermal management component 30 described above may be a cable structure or an electronic control component for providing electrical energy to the main body portion of the thermal management component 30 to achieve resistance heating.

[0115] In some embodiments, the shape of the first groove 40 may correspond to the shape of the main body portion of the thermal management component 30. Exemplarily, the shape of the main body portion of the thermal management component 30 may be a serpentine structure composed of several sections of structures. Correspondingly, the shape of the first groove 40 may be a serpentine groove structure composed of several sections of groove structures. Additionally, exemplarily, the shape of the main body portion of the thermal management component 30 may be a whole plate-like structure. Correspondingly, the shape of the first groove 40 may also be a continuous groove structure as a whole.

[0116] In the above solution, by forming the first groove 40 in the first wall 120 to accommodate the thermal management component 30, the thermal management component 30 can reasonably utilize the space on the wall thickness of the first wall 120, reducing the volume of the battery device 100 while being able to adjust the temperature of the battery cell assembly 20, which is beneficial to improving the volume energy density of the battery device 100. Among them, the second box body 12 is made by die-casting process. On the one hand, the manufacturing efficiency of the second box body 12 is high and the structural strength is high, that is, it is beneficial to improve the manufacturing efficiency and reliability of the battery device 100; on the other hand, it can also make the inner R angle of the first groove 40 smaller compared with other forming processes, reducing the risk that the thermal management component 30 interferes with the inner R angle of the first groove 40, resulting in damage to the thermal management component 30 and affecting the thermal management effect, and thus being beneficial to improving the reliability of the battery device 100.

[0117] According to some embodiments of the present application, the first groove 40 includes a groove bottom surface 41 and a groove side surface 42, and the groove bottom surface 41 and the groove side surface 42 are transitioned through a first rounded corner 43, and the radius of the first rounded corner 43 is not greater than 3 mm.

[0118] In some embodiments, the thermal management component 30 has an upper surface facing the battery cell assembly 20 and a lower surface facing away from the battery cell assembly 20. The groove bottom surface 41 of the first groove 40 can be arranged facing the lower surface of the thermal management component 30, and the groove side surface 42 of the first groove 40 can correspond to the peripheral surface of the thermal management component 30. Exemplarily, the thermal management component 30 is arranged in the first groove 40, and the lower surface of the thermal management component 30 is connected to the groove bottom surface 41 of the first groove 40 through an adhesive. The peripheral surface of the thermal management component 30 and the groove side surface 42 of the first groove 40 can also be connected through an adhesive.

[0119] Please refer to Figure 6 , the groove bottom surface 41 and the groove side surface 42 of the first groove 40 are transitioned through the first rounded corner 43. The first rounded corner 43 can also be referred to as the inner R angle of the first groove 40. The value of the radius R1 of the first rounded corner 43 can be a value not greater than 3 mm. Exemplarily, the value of the radius R1 of the first rounded corner 43 can be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm, a smaller value or any value between two adjacent values.

[0120] Please refer to Figure 5 , in some embodiments, the lower surface and the peripheral surface of the thermal management component 30 can also be transitioned through a rounded corner. The rounded corner of the thermal management component 30 can fit with the first rounded corner 43 or the radius of the rounded corner of the thermal management component 30 can be smaller than the radius of the first rounded corner 43.

[0121] In the above scheme, the first groove 40 is die-cast so that the radius of the first fillet 43 of the first groove 40 is not more than 3 mm, which can effectively reduce the risk of mutual interference between the thermal management component 30 and the groove wall of the first groove 40. On the one hand, it can effectively improve the space utilization of the thermal management component 30 and improve the volume energy density of the battery device 100; on the other hand, it reduces the risk of structural damage to the thermal management component 30 due to mutual interference with the groove wall of the first groove 40, thereby affecting the thermal management efficiency, which is beneficial to improving the reliability of the battery device 100.

[0122] According to some embodiments of the present application, the radius of the first rounded corner 43 is not less than 1 mm.

[0123] In some embodiments, the radius R1 of the first fillet 43 can be no greater than 3 mm and no less than 1 mm. For example, the radius R1 of the first fillet 43 can be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm or any value between two adjacent values.

[0124] In the above scheme, by setting the radius of the first fillet 43 to be not less than 1 mm and not more than 3 mm, on the one hand, the space utilization rate of the thermal management component 30 can be effectively improved, and the volume energy density of the battery device 100 can be improved; on the other hand, the risk of the thermal management component 30 being damaged due to interference with the groove wall of the first groove 40, which affects the thermal management efficiency, is reduced, which is beneficial to improving the reliability of the battery device 100; on the other hand, because the second box body 12 is a die-casting part, the radius of the first fillet 43 is set to be not less than 1 mm, which can reduce the risk of damage to the die-casting mold, which is beneficial to improving the service life of the die-casting mold, thereby reducing the manufacturing cost of the battery device 100.

[0125] According to some embodiments of the present application, the first surface 1200 and the groove side surface 42 of the first groove 40 are transitioned through a second fillet 44 , and the radius of the second fillet 44 is not less than 0.5 mm and not more than 2 mm.

[0126] See also Figure 6 The first surface 1200 is recessed toward a side away from the battery cell assembly 20 to form a first groove 40. The groove side surface 42 of the first groove 40 transitions to the first surface 1200 through a second fillet 44. The radius R2 of the second fillet 44 can be not less than 0.5 mm and not more than 2 mm. Exemplarily, the radius R2 of the second fillet 44 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm or any value between two adjacent values.

[0127] In the above solution, the first surface 1200 and the side surface 42 of the first groove 40 are transitioned through a second fillet 44, and the radius of the second fillet 44 is not less than 0.5 mm and not greater than 2 mm. On the one hand, it can make the distance between the thermal management component 30 and the side surface 42 of the first groove 40 relatively small, which is conducive to improving the integration degree of the thermal management component 30 and the first wall 120, thereby facilitating the improvement of the volume energy density of the battery device 100. On the other hand, the thermal management component 30 and the first groove 40 are connected through a gluing process. Since the distance between the management component and the side surface 42 of the first groove 40 is relatively small, the amount of glue applied can be effectively reduced, so as to reduce costs and is conducive to the improvement of the mass energy density of the battery device 100. On the other hand, through the transition of the second fillet 44, the risk of damage to the die-casting mold can be reduced, which is beneficial to the improvement of the service life of the die-casting mold, thereby reducing the manufacturing cost of the battery device 100.

[0128] According to some embodiments of the present application, the thermal management component 30 has a second surface 30a facing the side surface 42 of the first groove 40, and the minimum distance between the second surface 30a and the side surface 42 is not less than 1 mm and not greater than 3 mm.

[0129] In some embodiments, the thermal management component 30 is disposed in the first groove 40, and the thermal management component 30 has a second surface 30a facing the side surface 42 of the first groove 40. Optionally, the second surface 30a and the side surface 42 of the first groove 40 are in clearance fit; optionally, a bonding structure is provided between the second surface 30a and the side surface 42 of the first groove 40, and the bonding structure connects the second surface 30a and the side surface 42.

[0130] In some embodiments, there is a draft angle between the side surface 42 and the bottom surface 41 of the first groove 40, the side surface 42 is inclined with respect to the bottom surface 41, and the second surface 30a of the thermal management component 30 can be perpendicular to the bottom surface 41. Along the direction from the thermal management component 30 to the battery cell assembly 20, the distance between the second surface 30a and the side surface 42 gradually increases. Exemplarily, the minimum distance between the two can be a value not less than 1 mm and not greater than 3 mm. The minimum distance between the second surface 30a and the side surface 42 is L, and the value of L can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or any value between two adjacent values. In these embodiments, the maximum distance between the second surface 30a and the side surface 42 can be a value greater than 1 mm, such as 1.5 mm, 2 mm, 3 mm.

[0131] In some other embodiments, the groove side surface 42 of the first groove 40 is arranged parallel to the second surface 30a, and the distance between the two is L. The value of L can be a value not less than 1 mm and not greater than 3 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or any value between two adjacent values. Optionally, in some embodiments, there is a distance between the groove side surface 42 of the first groove 40 and the second surface 30a, and the value of this distance is not less than 1 mm and not greater than 3 mm. That is, along the direction pointing from the groove side surface 42 to the second surface 30a, the distance between any part of the groove side surface 42 and any part of the second surface 30a is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or any value between two adjacent values.

[0132] In the above solution, along the direction pointing from the second surface 30a to the groove side surface 42, the size of the heat management component 30 can be smaller than the size of the first groove 40. For example, the minimum distance between the heat management component 30 and the groove side surface 42 is set to be not less than 1 mm and not greater than 3 mm. On the one hand, it can reduce the risk of interference between the heat management component 30 and the first groove 40, which is beneficial to improving the assembly efficiency of the heat management component 30 in the first groove 40; on the other hand, it can control the amount of glue applied between the heat management component 30 and the first groove 40, so as to reduce costs and is beneficial to improving the mass energy density of the battery device 100.

[0133] According to some embodiments of the present application, an adhesive layer 50 is provided between the heat management component 30 and the groove bottom surface 41, and the thickness of the adhesive layer 50 is not less than 0.2 mm and not greater than 1.5 mm.

[0134] In some embodiments, an adhesive layer 50 is provided between the heat management component 30 and the groove bottom surface 41 so that the heat management component 30 is bonded to the first groove 40. In some embodiments, the adhesive layer can be made of double-sided tape, structural adhesive, or other sticky materials. Optionally, during the process of assembling the heat management component 30 into the first groove 40, the double-sided tape can be first set on the lower surface of the heat management component 30 or on the groove bottom surface 41 of the first groove 40, and then the heat management component 30 and the first groove 40 are combined with each other. Optionally, during the process of assembling the heat management component 30 into the first groove 40, the glue solution can be coated on the lower surface of the heat management component 30 or in the first groove 40, and then the heat management component 30 and the first groove 40 are combined with each other, and the glue solution is dried by baking.

[0135] In some embodiments, the thickness of the adhesive layer can be regarded as the distance between the heat management component 30 and the groove bottom surface 41 along the direction pointing from the battery cell assembly 20 to the first wall 120.

[0136] In some embodiments, please refer toFigure 6 The thickness of the adhesive layer 50 is H, and the value of H can be not less than 0.2 mm and not more than 1.5 mm. For example, the value of H can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or any value between two adjacent values.

[0137] In the above solution, the thermal management component 30 is fixed in the first groove 40 through the adhesive layer 50, and can stably exchange heat with the battery cell assembly 20, thereby effectively regulating the temperature of the battery cell assembly 20, which is beneficial to improving the reliability of the battery device 100. At the same time, the thickness of the adhesive layer 50 is set to be not less than 0.2 mm and not more than 1.5 mm. On the one hand, it can reduce the risk that the adhesive layer 50 is too thin to effectively fix the thermal management component 30 in the first groove 40, resulting in the first groove 40 being separated from the first groove 40 and causing thermal management failure. On the other hand, it can reduce the risk of increasing the manufacturing material cost of the battery device 100 and reducing the mass energy density of the battery device 100 due to the too thick adhesive layer 50.

[0138] In some embodiments, the thermal management component 30 is disposed in the first groove 40 by means of gluing. There are adhesive layers 50 between the lower surface of the thermal management component 30 and the groove bottom surface 41 of the first groove 40, and between the peripheral surface of the thermal management component 30 and the groove side surface 42 of the first groove 40 respectively.

[0139] According to some embodiments of the present application, please refer to Figure 3 、 Figure 7 and Figure 8 。 Figure 7 FIG. 18 is an exploded perspective view of the second box body 12 and the thermal management component 30 in some embodiments of the present application, Figure 8 FIG. 19 is a schematic structural view of the thermal management component 30 in some embodiments of the present application.

[0140] A flow channel 30b is formed inside the thermal management component 30. The flow channel 30b is used to accommodate a medium. The thermal management component 30 includes a current collector 31 and a body 32 that are connected to each other. The current collector 31 has an inlet and an outlet, and the inlet and the outlet are communicated with the flow channel 30b. The body 32 is disposed in the first groove 40.

[0141] The thermal management component 30 has a flow channel 30b inside. The flow channel 30b is used to accommodate a medium so that the medium can exchange heat with the battery cell assembly 20 to manage the temperature of the battery cell 21, such as heating or cooling. Optionally, the medium can be a fluid, and the fluid can be a liquid or a gas. Exemplarily, the medium can be a gas, such as air or hydrogen, etc. The heat exchange medium can also be a liquid, such as water, brine solution or liquid nitrogen, etc.

[0142] In some embodiments, the thermal management component 30 includes a body 32 and a current collector 31. The body 32 is the main component for thermal management of the battery cell assembly 20. Optionally, the body 32 is located in the first groove 40 and between the first wall 120 and the battery cell assembly 20. The current collector 31 can be located outside the battery cell assembly 20. That is, along the thickness direction z of the first wall, the orthographic projection of the battery cell assembly 20 does not overlap with the orthographic projection of the current collector 31.

[0143] The current collector 31 is used to connect an external pipeline to the body 32 so that an external fluid enters the flow channel 30b inside the body 32. Exemplarily, connectors are provided at the inlet and outlet of the current collector 31. The connectors are connected to the water tank at the vehicle end through an external pipeline. The water in the water tank at the vehicle end enters the body 32 through the pipeline and the current collector 31, and the water inside the body 32 returns to the water tank at the vehicle end through the current collector 31.

[0144] In some embodiments, the current collector 31 can be square, rectangular, strip-shaped or cylindrical. Optionally, please refer to Figure 8 , the current collector 31 is rectangular.

[0145] In some embodiments, the thermal management component 30 is made of metal materials including but not limited to aluminum, aluminum alloy, stainless steel, etc., or made of non-metal materials including but not limited to plastics.

[0146] In some embodiments, the materials of the current collector 31 and the main body can be the same or different. Exemplarily, both the current collector 31 and the main body are made of aluminum, aluminum alloy or stainless steel.

[0147] In the above solution, a flow channel 30b is formed inside the thermal management component 30. By connecting the body 32 to an external medium storage device, the medium can be stably provided to the flow channel 30b inside the body 32, so as to effectively exchange heat with the battery cell assembly 20 to effectively regulate the temperature of the battery cell assembly 20, which is beneficial to improving the reliability of the battery device 100.

[0148] According to some embodiments of the present application, please refer to Figure 5 , the body 32 has a third surface 32a facing away from the bottom surface 41 of the first groove 40. Along the direction from the first wall 120 to the battery cell assembly 20, the third surface 32a does not protrude from the first surface 1200.

[0149] The body 32 has a third surface 32a facing away from the bottom surface 41 of the groove. In some embodiments, the third surface 32a can be the part where the body 32 exchanges heat with the battery cell assembly 20. In some embodiments, the third surface 32a can be the upper surface of the body 32. "In the direction from the first wall 120 towards the battery cell assembly 20, the third surface 32a does not protrude beyond the first surface 1200" can be understood as that the body 32 is embedded in the first groove 40 and does not protrude from the first groove 40.

[0150] Optionally, the third surface 32a of the body 32 is flush with the first surface 1200. The third surface 32a of the body 32 and the first surface 1200 jointly contact the battery cell assembly 20 and support the battery cell assembly 20.

[0151] Optionally, the third surface 32a of the body 32 is in the first groove 40 and is below the first surface 1200, and there is a distance between the third surface 32a and the battery cell assembly 20.

[0152] In some embodiments, an adhesive layer can be provided between the battery cell assembly 20 and the first wall 120. The adhesive layer can be a thermally conductive adhesive, which can play a role in fixing the battery cell assembly 20 and heat conduction. In some embodiments where the third surface 32a of the body 32 is in the first groove 40 and is below the first surface 1200, the gap between the third surface 32a and the battery cell assembly 20 can be filled with the adhesive layer.

[0153] In the above solution, the body 32 of the thermal management component 30 can be embedded in the first groove 40 and does not protrude beyond the first surface 1200 of the first wall 120. On the one hand, it can improve the integration degree of the first wall 120 and the thermal management component 30, which is beneficial to the improvement of the volume energy density of the battery device 100. On the other hand, it can effectively reduce the interference of the thermal management component 30 on the battery cell assembly 20, and reduce the risk of structural damage to the battery cell assembly 20 or the thermal management component 30 due to mutual interference, making the battery device 100 highly reliable.

[0154] According to some embodiments of the present application, please refer to Figure 7 , along the first direction x, the current collector 31 is located on one side of the body 32. The body 32 includes a first part 320 and a second part 321 arranged in sequence along the second direction y. The first part 320 and the second part 321 are connected in parallel to the current collector 31. The first direction x, the second direction y, and the thickness direction z of the first wall are perpendicular to each other in pairs.

[0155] In some embodiments, the first direction x, the second direction y, and the thickness direction z of the first wall are perpendicular to each other pairwise. Exemplarily, the first direction x can be the length direction of the box body 10, the second direction y can be the width direction of the box body 10, and the thickness direction z of the first wall can be the height direction of the box body 10.

[0156] A flow channel 30b is provided inside the current collector 31 for enabling the medium to enter or exit the main body 32.

[0157] In some embodiments, the number of current collectors 31 can be one. The current collector 31 can be located on one side of the main body 32 in the first direction x for enabling the entry and exit of the medium. The main body 32 includes a first part 320 and a second part 321. The first part 320 and the second part 321 are connected in parallel to the current collector 31. The current collector 31 can supply the medium to the first part 320 and the second part 321 simultaneously, and can also discharge the medium in the first part 320 and the second part 321 simultaneously.

[0158] In some embodiments, the structural form of the first part 320 can be diverse. Exemplarily, the first part 320 can be a whole plate-like structural member, or the first part 320 can be a serpentine structural member composed of multiple tubular structures. In some embodiments, the structural form of the second part 321 can be diverse. Exemplarily, the second part 321 can be a whole plate-like structural member, or the second part 321 can be a serpentine structural member composed of multiple tubular structures.

[0159] In some embodiments, the main body 32 can include not only the first part 320 and the second part 321, but also a third part or a fourth part or more parts. Exemplarily, the main body 32 includes a first part 320, a second part 321, and a third part. The first part 320, the second part 321, and the third part are arranged side by side in the second direction y and are connected in parallel to the current collector 31.

[0160] In other embodiments, the number of current collectors 31 can be two. The two current collectors 31 are respectively arranged on opposite sides of the main body 32 in the first direction x. One current collector 31 can enable the entry of the medium, and the other current collector 31 can enable the exit of the medium.

[0161] In the above solution, by providing the first part 320 and the second part 321 connected in parallel, heat exchange can be respectively carried out with the battery cell assembly 20, effectively improving the heat exchange efficiency of the thermal management component 30, efficiently regulating the temperature of the battery cell assembly 20, enabling the battery cell assembly 20 to quickly be in a suitable temperature environment, which is beneficial to improving the charge and discharge performance of the battery device 100 and beneficial to improving the reliability of the battery device 100.

[0162] According to some embodiments of the present application, refer to Figure 8 , the first part 320 includes a first connection section 3200, a second connection section 3201, a third connection section 3202, and a first straight section 3203. A plurality of first straight sections 3203 are arranged along the second direction y, and two adjacent first straight sections 3203 are connected by the third connection section 3202. The first connection section 3200 and the second connection section 3201 are arranged along the first direction x and are respectively connected to the current collector 31. One end of the first connection section 3200 away from the current collector 31 is connected to one of the plurality of first straight sections 3203, and one end of the second connection section 3201 away from the current collector 31 is connected to another one of the plurality of first straight sections 3203.

[0163] In some embodiments, the first part 320 can be a serpentine pipe structure, including multiple pipe segments. Exemplarily, the first part 320 is composed of multiple flat pipes, and the multiple flat pipes are arranged in a serpentine shape.

[0164] Refer to Figure 8 , the first part 320 includes a first connection section 3200, a second connection section 3201, a third connection section 3202, and a first straight section 3203. The number of the first straight sections 3203 is multiple, and the multiple first straight sections 3203 are arranged side by side at intervals along the second direction y. The multiple first straight sections 3203 are connected by the third connection section 3202. One of the multiple first straight sections 3203 is connected to the current collector 31 through the first connection section 3200, and another one of the multiple first straight sections 3203 is connected to the current collector 31 through the second connection section 3201, so that the flow channel 30b in the first part 320 is arranged in a serpentine shape and communicates with the current collector 31.

[0165] Exemplarily, refer to Figure 8 , the number of the first straight sections 3203 is four, and the number of the third connection sections 3202 is three. The four first straight sections 3203 are arranged side by side at intervals along the second direction y. The first connection section 3200 and the second connection section 3201 are located on one side of the four first straight sections 3203 along the first direction x and are respectively connected to the current collector 31. One of the three third connection sections 3202 is located on the other side of the four first straight sections 3203 along the first direction x and connects the two outermost first straight sections 3203 along the second direction y. The remaining two of the three third connection sections 3202 respectively connect the outermost first straight section 3203 and the first straight section 3203 adjacent to the outermost first straight section 3203.

[0166] Optionally, the flow direction of the medium can be that it enters the first connection section 3200 from the current collector 31, enters the first straight section 3203 and the third connection section 3202, and finally flows out of the current collector 31 through the second connection section 3201.

[0167] Optionally, the first groove 40 is provided with a multi-segment groove structure corresponding to the multi-segment pipeline structure of the first part 320, so that the first connection segment 3200, the second connection segment 3201, the third connection segment 3202, and the first straight segment 3203 are all arranged in the corresponding groove structures.

[0168] In the above solution, the first part 320 includes a multi-segment structure forming a serpentine cold plate. On the one hand, it can increase the heat exchange area with the battery cell assembly 20, which is beneficial to improving the thermal management efficiency. On the other hand, it can make the volume of the thermal management component 30 small, which is beneficial to controlling the material cost of the thermal management component 30 and also beneficial to improving the volume energy density of the battery device 100.

[0169] According to some embodiments of the present application, the second part 321 includes a fourth connection segment 3210, a fifth connection segment 3211, a sixth connection segment 3212, and a second straight segment 3213. A plurality of second straight segments 3213 are arranged along the second direction y, and the plurality of second straight segments 3213 are connected by the sixth connection segment 3212. The fourth connection segment 3210 and the fifth connection segment 3211 are arranged along the first direction x and are respectively connected to the current collector 31. One end of the fourth connection segment 3210 facing away from the current collector 31 is connected to one of the plurality of second straight segments 3213, and one end of the fifth connection segment 3211 facing away from the current collector 31 is connected to another one of the plurality of second straight segments 3213.

[0170] In some embodiments, the second part 321 may be a serpentine pipeline structure including multiple segments of pipelines. Exemplarily, the second part 321 is composed of multiple segments of flat pipelines, and the multiple segments of flat pipelines are arranged in a serpentine and winding manner.

[0171] Please refer to Figure 8 , the second part 321 includes a fourth connection segment 3210, a fifth connection segment 3211, a sixth connection segment 3212, and a second straight segment 3213. The number of the second straight segments 3213 is multiple, and the multiple second straight segments 3213 are arranged side by side at intervals along the second direction y. The multiple second straight segments 3213 are connected by the sixth connection segment 3212. One of the multiple second straight segments 3213 is connected to the current collector 31 through the fourth connection segment 3210, and another one of the multiple second straight segments 3213 is connected to the current collector 31 through the fifth connection segment 3211, so that the flow channel 30b in the second part 321 is arranged in a winding manner and is communicated with the current collector 31.

[0172] Exemplarily, please refer to Figure 8, the number of the second straight sections 3213 is four, and the number of the sixth connecting sections 3212 is three. The four second straight sections 3213 are arranged side by side at intervals along the second direction y. The fourth connecting section 3210 and the fifth connecting section 3211 are located on one side of the four second straight sections 3213 along the first direction x and are respectively connected to the current collector 31. One of the three sixth connecting sections 3212 is located on the other side of the four second straight sections 3213 along the first direction x and is connected to the two outermost second straight sections 3213 along the second direction y. The remaining two of the three sixth connecting sections 3212 respectively connect the outermost second straight section 3213 and the second straight section 3213 adjacent to the outermost second straight section 3213.

[0173] Optionally, the flow direction of the medium can be that it enters the fourth connecting section 3210 from the current collector 31, enters the second straight section 3213 and the sixth connecting section 3212, and finally flows out of the current collector 31 through the fifth connecting section 3211.

[0174] Optionally, the first groove 40 is provided with multiple groove-shaped structures corresponding to the multi-segment pipeline structure of the second part 321, so that the fourth connecting section 3210, the fifth connecting section 3211, the sixth connecting section 3212, and the second straight section 3213 are all arranged in the corresponding groove-shaped structures.

[0175] In the above solution, the second part 321 includes a multi-segment structure forming a serpentine cold plate. On the one hand, it can increase the heat exchange area with the battery cell assembly 20, which is beneficial to improving the heat management efficiency. On the other hand, it can make the volume of the heat management component 30 small, which is beneficial to controlling the material cost of the heat management component 30 and also beneficial to improving the volume energy density of the battery device 100.

[0176] According to some embodiments of the present application, please refer to Figure 3 and Figure 7 , the first wall 120 is formed with a second groove 60, the second groove 60 is communicated with the first groove 40, the current collector 31 is arranged in the second groove 60, and the current collector 31 is electrically connected to the first wall 120 at the same potential.

[0177] In some embodiments, the first wall 120 is formed with a second groove 60, the second groove 60 is arranged adjacent to the first groove 40, and the second groove 60 is communicated with the first groove 40. The second groove 60 can accommodate the current collector 31. Optionally, the current collector 31 is arranged in the second groove 60 and does not protrude from the first surface 1200. In some embodiments, the current collector 31 is electrically connected to the first wall 120 at the same potential to reduce the risk of the current collector 31 or the first wall 120 being electrochemically corroded. In some embodiments, the peripheral surface of the current collector 31 is provided with lugs, and the lugs are connected to the first wall 120 by bolts.

[0178] In the above scheme, the first wall 120 is formed with a second groove 60, which can, on the one hand, play the role of positioning and assembling the current collector 31, which is beneficial to the efficiency of assembling the thermal management component 30 on the first wall 120; on the other hand, it can reduce the interference of the current collector 31 with the internal structural parts of the battery device 100, which is beneficial to improve the internal space utilization of the battery device 100, so that the volume energy density of the battery device 100 is high.

[0179] According to some embodiments of this application, see Figure 3 The first surface 1200 is provided with a first connection portion 71 and a second connection portion 72, the first connection portion 71 and the second connection portion 72 are arranged at intervals along the first direction x, the battery cell assembly 20 is arranged between the first connection portion 71 and the second connection portion 72, and the first connection portion 71 and the second connection portion 72 are respectively connected to the battery cell assembly 20. Along the first direction x, the current collector 31 is arranged on a side of the first connection portion 71 away from the second connection portion 72, and the first direction x is perpendicular to the thickness direction z of the first wall.

[0180] In some embodiments, the first connection portion 71 and the second connection portion 72 are respectively disposed on the first surface 1200, and along the first direction x, the first connection portion 71 and the second connection portion 72 are spaced apart from each other, and the battery cell assembly 20 is located between the first connection portion 71 and the second connection portion 72. The first connection portion 71 may be directly or indirectly connected to the battery cell assembly 20, and the second connection portion 72 may be directly or indirectly connected to the battery cell assembly 20. Optionally, the first connection portion 71 is directly connected to the battery cell assembly 20, and the connection methods of the two are various, including but not limited to bonding, welding, riveting, screws or other methods. Optionally, the second connection portion 72 is directly connected to the battery cell assembly 20, and the connection methods of the two are various, including but not limited to bonding, welding, riveting, screws or other methods. Optionally, the first connection portion 71 is indirectly connected to the battery cell assembly 20, for example, the first connection portion 71 is connected to the mounting beam, the mounting beam can extend along the second direction y, the mounting beam is directly connected to the battery cell assembly 20, and the mounting beam and the battery cell assembly 20 are connected in various ways, including but not limited to bonding, welding, riveting, screws or other ways. Optionally, the second connection portion 72 is indirectly connected to the battery cell assembly 20, for example, the second connection portion 72 is connected to the mounting beam, the mounting beam can extend along the second direction y, the mounting beam is directly connected to the battery cell assembly 20, and the mounting beam and the battery cell assembly 20 are connected in various ways, including but not limited to bonding, welding, riveting, screws or other ways.

[0181] The current collector 31 is disposed on a side of the first connection portion 71 away from the second connection portion 72 . It can be understood that the current collector 31 and the battery cell assembly 20 are offset so as not to interfere with the battery cell assembly 20 .

[0182] In some embodiments, the first wall 120 may be divided into multiple regions. For example, along the first direction x, the first wall 120 may be divided into three regions. The region located in the middle forms the first surface 1200 to provide a corresponding first groove 40 for accommodating the body 32 of the thermal management component 30, so as to support the battery cell assembly 20. The region on one side of the first surface 1200 is separated from the region where the first surface 1200 is located by the first connection portion 71. The second groove 60 is in the region on one side of the first surface 1200, and several strengthening structures may be provided in this region. The heating structure may be a reinforcing rib, a reinforcing plate or other structural members. The region on the other side of the first surface 1200 is separated from the region where the first surface 1200 is located by the second connection portion 72, and several strengthening structures may be provided in this region. The heating structure may be a reinforcing rib, a reinforcing plate or other structural members.

[0183] In the above solution, by providing the first connection portion 71 and the second connection portion 72 spaced apart from each other along the first direction x on the first surface 1200, the position of the battery cell assembly 20 in the first direction x can be effectively restricted, and the battery cell assembly 20 can be effectively fixed, so that the battery device 100 has high structural stability, which is beneficial to improving the reliability of the battery device 100; at the same time, by arranging the current collector 31 outside the first connection portion 71, the risk of medium leakage at the connection between the body 32 and the current collector 31 and at the connection between the external medium storage device and the current collector 31, which may affect the battery cell assembly 20, resulting in the battery cell assembly 20 being corroded by the medium or the internal short circuit of the battery cell assembly 20, can be reduced, which is beneficial to improving the reliability of the battery device 100.

[0184] According to some embodiments of the present application, the first connection portion 71 includes a plurality of first connection members 710 arranged at intervals along the second direction y. The first connection members 710 are connected to the battery cell assembly 20. The first direction x, the second direction y and the thickness direction z of the first wall are perpendicular to each other in pairs.

[0185] In some embodiments, the first connection portion 71 includes a plurality of first connection members 710 arranged at intervals along the second direction y. Each first connection member 710 is used to directly or indirectly connect to the battery cell assembly 20. Exemplarily, the first connection member 710 may be a bolt post for directly or indirectly connecting to the battery cell assembly 20 in cooperation with a bolt.

[0186] In some embodiments, each first connecting member 710 is connected to the mounting beam, and the mounting beam is connected to the battery cell assembly 20. Optionally, the battery cell assembly 20 includes end plates and a plurality of stacked battery cells 21 disposed between the two end plates. The first connecting member 710 is a bolt column, and a plurality of first connecting members 710 are respectively connected to the same mounting beam by bolts, and the mounting beam is connected to the end plate of the battery cell assembly 20.

[0187] In the above solution, by providing a plurality of first connecting members 710 arranged at intervals along the second direction y, it is possible to effectively connect with the battery cell assembly 20, which is beneficial to the stability of the battery cell assembly 20 in the box body 10, reduce the risk of the battery cell assembly 20 being displaced due to external impact resulting in circuit disconnection, and improve the reliability of the battery device 100.

[0188] According to some embodiments of the present application, please refer to Figure 9 , Figure 9 is a schematic diagram of the second box body 12 in some embodiments of the present application. The second box body 12 further includes a second wall 121 and a third wall 122. The second wall 121 and the third wall 122 are respectively connected to the first wall 120. Along the first direction x, the second wall 121 and the third wall 122 are oppositely arranged, and the battery cell assembly 20 is located between the second wall 121 and the third wall 122.

[0189] The second box body 12 is a die-cast part, which includes a first wall 120, a second wall 121 and a third wall 122. The first wall 120 connects the second wall 121 and the third wall 122. The second wall 121 and the third wall 122 are arranged at intervals along the first direction x, and the battery cell assembly 20 is located between the second wall 121 and the third wall 122.

[0190] In some embodiments, a strengthening structure may be provided between the second wall 121 and the first wall 120 to make the structural strength of the first wall 120 and the second wall 121 high. Optionally, the inner sides of the first wall 120 and the second wall 121 may be connected by heating ribs.

[0191] In some embodiments, a strengthening structure may be provided between the third wall 122 and the first wall 120 to make the structural strength of the first wall 120 and the third wall 122 high. Optionally, the inner sides of the first wall 120 and the third wall 122 may be connected by heating ribs.

[0192] In the above solution, by providing the second wall 121 and the third wall 122 oppositely arranged along the first direction x, it is possible to effectively reduce the impact of external impact from the second direction y on the battery cell assembly 20, improve the impact resistance energy of the battery device 100, and be beneficial to the improvement of the reliability of the battery device 100.

[0193] According to some embodiments of the present application, please refer to Figure 9 , the battery device 100 further includes a connector (not shown in the figure), the connector is electrically connected to the battery cell assembly 20, the second wall 121 is formed with a first through hole 1210, and the connector is installed in the first through hole 1210.

[0194] The connector is a liquid cooling connector for medium transmission or an electrical connector for electrical energy output. Exemplarily, the connector is an electrical connector, which may include an electrical plug or an electrical socket for connecting the battery cell assembly 20 to the electrical device body 32 to realize the input or output of electrical energy between the battery and the electrical device body 32.

[0195] The second wall 121 is formed with a first through hole 1210, and the connector is installed in the first through hole 1210 and closes the first through hole 1210. In some embodiments, a sealing structure may be provided between the connector and the hole wall of the first through hole 1210. In some embodiments, the connector is connected to the second wall 121, and the connection relationship therebetween includes but is not limited to welding, bonding, snap connection, or threaded connection, etc.

[0196] In some embodiments, please refer to Figure 3 , along the first direction x, the second wall 121 and the first connecting portion 71 are spaced apart from each other, and the space formed therebetween can be used to accommodate at least a part of the connector. The end of the connector for cooperating with the electrical device body 32 can be exposed from the first through hole 1210, and the part of the connecting portion for connecting with the internal structure member of the battery device 100 can be located between the first wall 120 and the first connecting portion 71. Optionally, the connector can integrate the electrical connector and the liquid cooling connector into one body, wherein the part of the electrical connector between the first wall 120 and the first connecting portion 71 can be electrically connected to the battery cell assembly 20, and the part of the liquid cooling connector between the first wall 120 and the first connecting portion 71 can be connected to the joints at the inlets and outlets of the current collector 31 through pipelines.

[0197] In the above solution, by providing the first through hole 1210 on the second wall 121, the connector can pass through so that the battery device 100 is electrically connected to the external electrical device body 32.

[0198] According to some embodiments of the present application, the battery device 100 further includes a pressure relief mechanism (not shown in the figure), the second wall 121 is formed with a second through hole 1211, and the pressure relief mechanism is installed in the second through hole 1211.

[0199] The pressure relief mechanism is a structure for discharging the internal pressure of the battery device 100. Exemplarily, the pressure relief mechanism can be a pressure relief valve provided on the second through hole 1211. When the battery cell assembly 20 undergoes a thermal runaway and releases high-temperature and high-pressure gas, when the internal pressure of the box body 10 increases to a threshold value, the pressure relief mechanism is actuated, for example, ruptured or opened, to discharge the high-temperature and high-pressure gas inside the box body 10.

[0200] In the above solution, by providing the second through hole 1211 on the second wall 121 to install the pressure relief mechanism, the internal pressure of the battery device 100 can be effectively discharged, reducing the risk of thermal runaway or explosion of the battery device 100, which is beneficial to improving the reliability of the battery device 100.

[0201] According to some embodiments of the present application, the first box body 11 includes a fourth wall 110, a fifth wall 111, and a sixth wall 112. Along the thickness direction z of the first wall, the fourth wall 110 and the first wall 120 are oppositely arranged, the fourth wall 110 connects the fifth wall 111 and the sixth wall 112, the fifth wall 111 and the sixth wall 112 are oppositely arranged along the second direction y, and the first direction x, the second direction y, and the thickness direction z of the first wall are perpendicular to each other in pairs.

[0202] In some embodiments, the first box body 11 is similar to a "U" - shaped structure, which includes a fourth wall 110, a fifth wall 111, and a sixth wall 112. Along the second direction y, the fifth wall 111 and the sixth wall 112 are respectively arranged at both ends of the fourth wall 110. Exemplarily, the connection relationship between the fifth wall 111 and the sixth wall 112 and the fourth wall 110 includes but is not limited to bonding, welding, connection with threaded parts, or the first box body 11 is an integrally formed structure, for example, the first box body 11 is a die - casting. In some embodiments, the second box body 12 is similar to a "U" - shaped structure, which includes a first wall 120, a second wall 121, and a third wall 122. Along the first direction x, the second wall 121 and the third wall 122 are respectively arranged on both sides of the first wall 120.

[0203] In some embodiments, the first wall 120 can be regarded as the bottom of the box body 10, the fourth wall 110 is the top wall of the box body 10, and the second wall 121, the third wall 122, the fifth wall 111, and the sixth wall 112 form the peripheral wall of the box body 10.

[0204] In the above solution, both the first box body 11 and the second box body 12 form a structure similar to a "U". On the one hand, it is convenient for the first box body 11 and the second box body 12 to jointly define an assembly cavity for accommodating the battery cell 21 after being covered with each other. On the other hand, it can reduce the manufacturing difficulty of the first box body 11 and the second box body 12, and facilitate the subsequent maintenance of the battery cell assembly 20 accommodated in the box body 10, which is beneficial to reducing the later maintenance difficulty of the battery device 100.

[0205] According to some embodiments of the present application, along the second direction y, two outer side surfaces of the first walls 120 opposite to each other are respectively connected to the fifth wall 111 and the sixth wall 112.

[0206] In some embodiments, the fifth wall 111 may be connected to the outer side surface of the first wall 120 along the second direction y. For example, the inner side surface of the fifth wall 111 fits with the outer side surface of the first wall 120 along the second direction y to form a sealing surface perpendicular to the second direction y.

[0207] In some embodiments, the sixth wall 112 may be connected to the outer side surface of the first wall 120 along the second direction y. For example, the inner side surface of the sixth wall 112 fits with the outer side surface of the first wall 120 along the second direction y to form a sealing surface perpendicular to the second direction y.

[0208] In some embodiments, a plurality of connection holes are formed in the outer side surface of the first wall 120 along the second direction y. A sealing structure, such as a gasket, etc., is provided between the connecting parts of the first box body 11 and the second box body 12. The first box body 11 and the second box body 12 are connected to each other through connecting pieces. Some connecting pieces can pass through the fifth wall 111 and a part of the corresponding sealing structure to be arranged in the corresponding connection holes, and some connecting pieces can pass through the sixth wall 112 and a part of the corresponding sealing structure to be arranged in the corresponding connection holes.

[0209] In some embodiments, the inner side surface of the fifth wall 111 may also be connected to the outer side surfaces of the second wall 121 and the third wall 122, the inner side surface of the sixth wall 112 may also be connected to the outer side surfaces of the second wall 121 and the third wall 122, and the surface of the fourth wall 110 facing the first wall 120 may also be connected to the top surfaces of the second wall 121 and the third wall 122.

[0210] In the above solution, the fifth wall 111 and the sixth wall 112 are respectively connected to the outer side surface of the first wall 120, so that the connection surface between the first box body 11 and the second box body 12 is perpendicular to the horizontal plane, which can reduce the horizontal occupation of the battery device 100 and improve the space utilization rate of the battery device 100, which is beneficial to improving the endurance of the power-consuming device.

[0211] According to some embodiments of the present application, some embodiments of the present application further provide a power-consuming device, which includes the battery device 100 provided in the first aspect, and the battery device 100 is used to provide electric energy. Among them, the power-consuming device may be any of the foregoing devices or systems using the battery device 100.

[0212] According to some embodiments of the present application, a battery device 100 is provided. Please refer to Figures 2 - 9, the battery device 100 includes a box body 10, a battery cell assembly 20, and a thermal management component 30. The box body 10 includes a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an accommodation cavity for accommodating the battery cell assembly 20.

[0213] The first box body 11 and the second box body 12 are respectively in a "U" - shaped structure. The second box body 12 is a die - cast part, which is integrally formed by die - casting process. The second box body 12 includes a first wall 120, a second wall 121, and a third wall 122. The second wall 121 and the third wall 122 are respectively connected to the first wall 120. Along the first direction x, the second wall 121 and the third wall 122 are oppositely arranged, and the battery cell assembly 20 is located between the second wall 121 and the third wall 122. The first direction x is perpendicular to the thickness direction z of the first wall. The first box body 11 includes a fourth wall 110, a fifth wall 111, and a sixth wall 112. Along the thickness direction z of the first wall, the fourth wall 110 and the first wall 120 are oppositely arranged. The fourth wall 110 connects the fifth wall 111 and the sixth wall 112, and the fifth wall 111 and the sixth wall 112 are oppositely arranged along the second direction y. Along the second direction y, the two outer sides of the first wall 120 opposite to each other are respectively connected to the fifth wall 111 and the sixth wall 112.

[0214] A flow channel 30b is formed inside the thermal management component 30. The flow channel 30b is used to accommodate a medium, and the medium is used to achieve heat exchange with the battery cell assembly 20. Please refer to Figure 8 , the thermal management component 30 includes a current collector 31 and a body 32 which are connected to each other. The current collector 31 has an inlet and an outlet, and the inlet and the outlet are communicated with the flow channel 30b. Optionally, the current collector 31 has one inlet and one outlet, and joints are respectively arranged at the inlet and the outlet to be respectively connected to external pipelines, so that the medium circulates between the thermal management component 30 and the medium storage device. In some embodiments, the body 32 includes a first part 320 and a second part 321 arranged in parallel along the second direction y. The first part 320 and the second part 321 are in parallel with the current collector 31. The first part 320 and the second part 321 are respectively serpentine cold - plate structures, and their interiors are meanderingly arranged to have a large heat - exchange area with the battery cell assembly 20.

[0215] In some embodiments, the first wall 120 has a first surface 1200 forming the accommodation cavity, and a first groove 40 is formed on the first surface 1200. The body 32 of the thermal management component 30 is arranged in the first groove 40. Exemplarily, please refer to Figure 7 , the first groove 40 is serpentine and meanderingly formed on the first surface 1200 to be able to respectively accommodate the first part 320 and the second part 321, so that any part of the first part 320 and the second part 321 is located in the first groove 40.

[0216] In some embodiments, the body and the first groove 40 are connected by bonding. Optionally, an adhesive layer 50 is provided between the lower surface of the body and the bottom surface 41 of the first groove 40, and the adhesive layer 50 connects the body and the bottom surface 41 of the first groove 40.

[0217] In some embodiments, to reduce the risk of interference between the side wall of the first groove 40 and the body, the side wall and the bottom wall of the first groove 40 are transitioned by a first rounded corner 43, and the value range of the first rounded corner 43 can be not less than 1 mm and not more than 3 mm. For example, the value can be 1.5 mm. On the one hand, it can effectively improve the space utilization rate of the heat management component 30 and increase the volumetric energy density of the battery device 100; on the other hand, it reduces the risk that the heat management component 30 is damaged due to interference with the side wall of the first groove 40 and affects the heat management efficiency, which is beneficial to improving the reliability of the battery device 100; on the other hand, since the second box body 12 is a die-cast part, setting the radius of the first rounded corner 43 to be not less than 1 mm can reduce the risk of damage to the die-casting mold, which is beneficial to improving the service life of the die-casting mold, thereby reducing the manufacturing cost of the battery device 100.

[0218] In some embodiments, the peripheral surface of the heat management component 30 and the side wall of the first groove 40 can be in clearance fit. Exemplarily, the heat management component 30 has a second surface 30a facing the side surface 42 of the first groove 40, and the minimum distance L between the second surface 30a and the side surface 42 is not less than 1 mm and not more than 3 mm. For example, the value of the minimum distance L between the second surface 30a and the side surface 42 is 1.5 mm.

[0219] In some embodiments, the value range of the thickness H of the adhesive layer 50 between the body and the bottom surface 41 of the first groove 40 can be not less than 0.2 mm and not more than 1.5 mm. For example, the value is 1 mm. On the one hand, it can reduce the risk that the adhesive layer 50 is too thin to effectively fix the heat management component 30 in the first groove 40, resulting in the first groove 40 detaching from the first groove 40 and causing heat management failure; on the other hand, it can reduce the risk that the manufacturing material cost of the battery device 100 increases and the mass energy density of the battery device 100 decreases due to the adhesive layer 50 being too thick.

[0220] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A first box body; A second box body, which is a die-cast part. The second box body is connected to the first box body and together they enclose a receiving cavity. The second box body has a first wall, the first wall has a first surface forming the receiving cavity, and a first groove is formed on the first surface; A battery cell assembly, arranged in the receiving cavity; A thermal management component, at least partially arranged in the first groove, and the thermal management component is used to adjust the temperature of the battery cell assembly.

2. The battery device according to claim 1, wherein The first groove includes a groove bottom surface and a groove side surface, and the groove bottom surface and the groove side surface are transitioned by a first rounded corner, and the radius of the first rounded corner is not more than 3 mm.

3. The battery device according to claim 2, wherein The radius of the first rounded corner is not less than 1 mm.

4. The battery device according to claim 1, wherein The first surface and the groove side surface of the first groove are transitioned by a second rounded corner, and the radius of the second rounded corner is not less than 0.5 mm and not more than 2 mm.

5. The battery device according to claim 1, wherein The thermal management component has a second surface facing the groove side surface of the first groove, and the minimum distance between the second surface and the groove side surface is not less than 1 mm and not more than 3 mm.

6. The battery device according to claim 1, wherein A bonding layer is provided between the thermal management component and the groove bottom surface of the first groove, and the thickness of the bonding layer is not less than 0.2 mm and not more than 1.5 mm.

7. The battery device according to claim 1, wherein A flow channel is formed inside the thermal management component, and the flow channel is used to accommodate a medium. The thermal management component includes a current collector and a body connected to each other. The current collector has an inlet and an outlet, and the inlet and the outlet communicate with the flow channel, and the body is arranged in the first groove.

8. The battery device according to claim 7, wherein The body has a third surface facing away from the groove bottom surface of the first groove, and along the direction from the first wall to the battery cell assembly, the third surface does not protrude beyond the first surface.

9. The battery device according to claim 7, wherein Along a first direction, the current collector is located on one side of the body. The body includes a first part and a second part arranged side by side along a second direction. The first part and the second part are connected in parallel to the current collector, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

10. The battery device according to claim 9, wherein The first part includes a first connection section, a second connection section, a third connection section, and a first straight section; A plurality of the first straight sections are arranged along the second direction, and the plurality of first straight sections are connected by the third connecting section. The first connecting section and the second connecting section are arranged along the first direction and are respectively connected to the current collector. One end of the first connecting section facing away from the current collector is connected to one of the plurality of first straight sections, and one end of the second connecting section facing away from the current collector is connected to another one of the plurality of first straight sections.

11. The battery device according to claim 9, wherein The second part includes a fourth connecting section, a fifth connecting section, a sixth connecting section, and a second straight section; A plurality of the second straight sections are arranged along the second direction, and the plurality of second straight sections are connected by the sixth connecting section. The fourth connecting section and the fifth connecting section are arranged along the first direction and are respectively connected to the current collector. One end of the fourth connecting section facing away from the current collector is connected to one of the plurality of second straight sections, and one end of the fifth connecting section facing away from the current collector is connected to another one of the plurality of second straight sections.

12. The battery device according to claim 7, wherein The first wall is formed with a second groove, and the second groove communicates with the first groove. The current collector is disposed in the second groove, and the current collector is electrically connected to the first wall at the same potential.

13. The battery device according to claim 7, wherein The first surface is provided with a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are spaced apart along the first direction. The battery cell assembly is disposed between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are respectively connected to the battery cell assembly; Along the first direction, the current collector is disposed on a side of the first connecting portion facing away from the second connecting portion, and the first direction is perpendicular to the thickness direction of the first wall.

14. The battery device according to claim 13, wherein The first connecting portion includes a plurality of first connecting members spaced apart along the second direction. The first connecting members are connected to the battery cell assembly, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

15. The battery device according to any one of claims 1-14, wherein The second box body further includes a second wall and a third wall. The second wall and the third wall are respectively connected to the first wall. Along the first direction, the second wall and the third wall are disposed opposite to each other, and the battery cell assembly is located between the second wall and the third wall.

16. The battery device according to claim 15, wherein The battery device further includes a connector, and the connector is electrically connected to the battery cell assembly. The second wall is formed with a first through hole, and the connector is installed in the first through hole.

17. The battery device according to claim 15, wherein The battery device further includes a pressure relief mechanism. The second wall is formed with a second through hole, and the pressure relief mechanism is installed in the second through hole.

18. The battery device according to claim 15, characterized in that the first box body includes a fourth wall, a fifth wall and a sixth wall. Along the thickness direction of the first wall, the fourth wall and the first wall are oppositely arranged. The fourth wall connects the fifth wall and the sixth wall. The fifth wall and the sixth wall are oppositely arranged along a second direction. The first direction, the second direction and the thickness direction of the first wall are perpendicular to each other in pairs.

19. The battery device according to claim 18, characterized in that along the second direction, two outer sides of the first wall opposite to each other are respectively connected to the fifth wall and the sixth wall.

20. An electrical device, characterized in that, A battery device including any one of claims 1-19, the battery device being used to provide electric energy.

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