Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a battery box, and a containing cavity is defined in the battery box; the plurality of battery monomers are accommodated in the accommodating cavity; the temperature control assembly comprises at least one thermal control gasket, the at least one thermal control gasket is arranged between two adjacent battery monomers, the thermal control gasket has a first state and a second state, and the thermal control gasket is used for absorbing heat of the battery monomers; the thermal control gasket is configured to be capable of being converted into a second state from a first state under the condition that the temperature reaches a first preset temperature threshold value, and being converted into the first state from the second state under the condition that the temperature is lower than the first preset temperature threshold value, the heat conductivity coefficient of the thermal control gasket in the first state is larger than that of the thermal control gasket in the second state. According to the technical scheme of the invention, the risk of thermal runaway of the battery device can be reduced, and the stability and safety of the battery device in use can be improved.

Description

Technical Field

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

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, with the rapid development of new energy vehicles, battery devices are increasingly coming into the public eye.

[0004] The battery device contains one or more battery cells. During operation, temperature is a crucial parameter affecting the performance of the battery cells. If the temperature rises sharply, there is a risk of fire or explosion due to thermal runaway. Utility Model Content

[0005] The purpose of this application is to provide a battery device and an electrical device to improve the stability of the battery device during use. This purpose is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery device, comprising: a battery case defining a receiving cavity; a plurality of battery cells housed within the receiving cavity; and a temperature control component including at least one thermal control pad, wherein at least one thermal control pad is disposed between two adjacent battery cells, the thermal control pad having a first state and a second state, the thermal control pad being used to absorb heat from the battery cells to cool the battery cells, and the thermal control pad being configured to transition from the first state to the second state when the temperature reaches a first preset temperature threshold, and to transition from the second state to the first state when the temperature is below the first preset temperature threshold, wherein the thermal conductivity of the thermal control pad in the first state is greater than the thermal conductivity of the thermal control pad in the second state.

[0007] According to the battery device provided in this application, by setting at least one thermal control pad between two adjacent battery cells, the battery cells generate heat and their temperature gradually increases during use. At this time, the thermal control pad absorbs the heat generated by the two adjacent battery cells to reduce the temperature of the battery cells themselves. When the temperature of the thermal control pad reaches a first preset threshold, it can change from a first state to a second state. In the second state, the thermal conductivity of the thermal control pad is reduced, which plays a temporary heat insulation role and enables the thermal control pad to play a certain heat-blocking role to slow down the heat transfer between battery cells. This helps to reduce the risk of thermal runaway of the battery device, thereby reducing the risk of fire or explosion of the battery device and improving the stability and safety of the battery device.

[0008] In addition, the battery device provided in this application may also have the following additional technical features:

[0009] In some embodiments of this application, the temperature control component further includes a cooling component, which is disposed between two adjacent battery cells, and a thermal control pad is respectively disposed on opposite sides of the cooling component. The cooling component is configured to absorb heat when the temperature reaches a second preset temperature threshold, which is greater than the first preset temperature threshold.

[0010] In the above technical solution, two thermal control pads are provided between two adjacent battery cells, and a cooling component is also provided between the two thermal control pads. The cooling component can absorb heat when the temperature is higher than the first preset temperature threshold and reaches the second preset temperature threshold, thereby realizing graded control of the temperature between battery cells. It can absorb heat when the thermal control pads can no longer absorb heat, thereby realizing graded control of the temperature between battery cells and further reducing the risk of thermal runaway of the battery device, and further improving the stability and safety of the battery device.

[0011] In some embodiments of this application, the cooling assembly includes: a housing defining a receiving space, and the surface of the housing having through holes; and a first heat-absorbing element disposed within the receiving space, the first heat-absorbing element being configured to absorb heat when the temperature reaches a second preset temperature threshold.

[0012] In the above technical solution, the housing of the cooling component is provided with through holes for airflow. The first heat-absorbing element is disposed in the housing space and can further absorb the heat generated by the battery cells when the temperature is higher than the first preset temperature threshold and reaches the second preset temperature threshold. Then, the heat is converted into its own latent heat through a change of state, thereby realizing graded control of the temperature between battery cells.

[0013] In some embodiments of this application, the cooling assembly further includes: a separator disposed within the receiving space and dividing the receiving space into a first receiving space and a second receiving space, wherein the first heat-absorbing element is received in the first receiving space; and a second heat-absorbing element received in the second receiving space, wherein the second heat-absorbing element is configured to absorb heat when the temperature is greater than a third preset temperature threshold, wherein the third preset temperature threshold is greater than the second preset temperature threshold.

[0014] In the above technical solution, the separator divides the housing into a first housing space and a second housing space. The first heat absorber and the second heat absorber are respectively disposed in the first housing space and the second housing space. The first heat absorber and the second heat absorber have different triggering temperatures for heat absorption. Specifically, the first heat absorber triggers heat absorption when the temperature reaches a second preset temperature threshold. If the temperature continues to rise and reaches a third preset temperature threshold, the second heat absorber triggers heat absorption again and converts the heat into its own latent heat through a change of state. This can further achieve graded control of the temperature of the battery cell and achieve a stepped cooling effect, thereby further reducing the risk of thermal runaway of the battery device.

[0015] In some embodiments of this application, the separator is configured to deform when the temperature reaches the third preset temperature threshold to connect the first accommodating space and the second accommodating space.

[0016] In the above technical solution, the separator is a heat-deformable separator. When the temperature of the cooling component reaches the third preset temperature threshold, the separator can deform, so that the first accommodating space and the second accommodating space are connected. After the first heat-absorbing component and the second heat-absorbing component come into contact, a rapid heat absorption reaction can occur, thereby improving the cooling efficiency of the battery cell.

[0017] In some embodiments of this application, there is a gap between the housing and the first heat absorber, and / or a gap between the housing and the second heat absorber.

[0018] In the above technical solution, since the first heat absorber and the second heat absorber undergo a change of state of matter when the endothermic reaction is triggered, by defining a gap between the shell and the first heat absorber and / or the second heat absorber, the first heat absorber and the second heat absorber can absorb heat sufficiently, which helps to improve the cooling effect on the battery cell.

[0019] In some embodiments of this application, the first heat-absorbing element includes a first encapsulation body having a plurality of first adsorption pores filled with a first phase change material; and / or, the second heat-absorbing element includes a second encapsulation body having a plurality of second adsorption pores filled with a second phase change material.

[0020] In the above technical solution, the first phase change material and the second phase change material have different temperatures at which they are triggered to absorb heat, thereby enabling graded temperature control of multiple battery cells.

[0021] In some embodiments of this application, the temperature control component further includes a heating element, which is provided between the bottom plate of the battery box and the plurality of batteries and / or between the plurality of battery cells and the side plate of the battery box, for heating the plurality of battery cells.

[0022] In the above technical solution, by setting a heating element for heating the battery cells inside the battery box, the battery cells can be heated by the heating element when the temperature of the battery cells is lower than the minimum preset temperature threshold (such as 10°C), so that the temperature of the battery cells can be maintained within the optimal operating temperature range, thereby helping to improve the cycle life of the battery cells.

[0023] In some embodiments of this application, the temperature control assembly further includes a control device and a plurality of temperature sensors, wherein the control device is electrically connected to the heating element and the plurality of temperature sensors, and each of the battery cells is provided with at least one of the temperature sensors.

[0024] In the above technical solution, the operating temperature of each battery cell is detected in real time by a temperature sensor, and the temperature sensor can transmit the detected temperature to the control device in real time. This allows the control device to control the opening and closing of the heating element according to the operating temperature of each battery cell, thereby achieving closed-loop control. The structure and principle are relatively simple and easy to implement.

[0025] In some embodiments of this application, the thermal control gasket includes a thermoplastic resin gasket.

[0026] In the above technical solution, the thermoplastic resin gasket has a high thermal conductivity in the hardened state. When the temperature reaches the first preset temperature threshold, the thermoplastic resin gasket absorbs heat and can be in a softened state. When it is in a softened state, its thermal conductivity will decrease, thereby playing a certain role in heat insulation. This can reduce the heat transfer between battery cells to a certain extent and reduce the risk of thermal runaway in the battery device.

[0027] Secondly, this application provides an electrical device including a battery device as described in any one of the embodiments of the first aspect, the battery device being used to supply power to the electrical device.

[0028] The electrical device provided according to this application includes the battery device described in any one of the first aspect embodiments, and therefore has the technical effects of any of the above embodiments, which will not be repeated here. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0031] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0032] Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the assembly structure of a temperature control component and a battery device provided in one embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of a cooling assembly provided in some embodiments of this application;

[0035] Figure 6 This is a schematic diagram of the assembly structure of the temperature control component and battery device provided in another embodiment of this application.

[0036] The attached figures are labeled as follows:

[0037] 1000, vehicles;

[0038] 100. Battery assembly; 200. Controller; 300. Motor;

[0039] 10. Battery box; 11. First box; 12. Second box; 13. Receiving cavity; 20. Battery cell; 31. Thermal control pad; 32. Cooling assembly; 33. Heating element; 34. Control device; 35. Temperature sensor;

[0040] 321. First heat-absorbing element; 322. Second heat-absorbing element; 324. Gap; 325. Through hole; 333. Separator. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0050] The battery device contains one or more battery cells. During operation, temperature is a crucial parameter affecting the performance of the battery cells. If the temperature rises sharply, there is a risk of fire or explosion due to thermal runaway.

[0051] To address the risk of thermal runaway in individual battery cells during operation, this application designs a battery device. The device includes a battery box containing multiple individual battery cells arranged sequentially. A temperature control component is positioned between adjacent battery cells. This component includes at least one thermal control pad, which has a first state and a second state. When the thermal conductivity of the pad in the first state is greater than that in the second state, and the pad can absorb heat generated by the battery cells to cool them, the pad softens and transitions from the first state to the second state when the temperature reaches a first preset temperature threshold. At this point, the thermal conductivity of the pad decreases, providing temporary insulation to delay temperature transfer between battery cells. This reduces the risk of thermal runaway in the battery device, as well as the risk of fire or explosion, thus improving the stability and safety of the battery device.

[0052] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for this electrical device can be composed of battery cells and batteries disclosed in this application, which helps reduce the risk of thermal runaway and improves the stability of the battery device.

[0053] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0055] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0056] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0057] Please see Figure 2 and Figure 3 , Figure 2 This is an exploded view of the battery device provided in some embodiments of this application; Figure 3This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 100, including a battery case 10, a temperature control component, and multiple battery cells 20. The battery case 10 defines a receiving cavity 13; the multiple battery cells 20 are housed within the receiving cavity 13; the temperature control component includes at least one thermal control pad 31, with at least one thermal control pad 31 disposed between two adjacent battery cells 20. The thermal control pad 31 has a first state and a second state, and is used to absorb heat from the battery cells 20. The thermal control pad 31 is configured to transition from the first state to the second state when the temperature reaches a first preset temperature threshold, and to transition from the second state to the first state when the temperature is below the first preset temperature threshold. The thermal conductivity of the thermal control pad 31 in the first state is greater than that in the second state.

[0058] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via busbars.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0060] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0061] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0062] As an example, battery cell assemblies can be housed in a housing by fixing the battery module within the housing.

[0063] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 20 to the housing.

[0064] As an example, the battery box 10 may include a first box 11 and a second box 12. The first box 11 and the second box 12 are fastened together to form a closed space inside the battery box 10 for housing individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0065] As an example, the battery box 10 may include an end cap, a frame, and a base plate. The end cap and the base plate are respectively connected to the frame, so that the interior of the box forms an enclosed space to accommodate individual battery cells.

[0066] In some embodiments, the battery box 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the box may be at least a part of the vehicle's floor, or a portion of the box may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0067] In some embodiments, the heat control pad 31 has the characteristic of softening upon heating and hardening upon cooling, and this process can be repeated. For example, the heat control pad 31 can be a nonwoven fabric layer and a resin-impregnated layer, with the resin-impregnated layer disposed on at least one side of the nonwoven fabric layer in the thickness direction. The nonwoven fabric layer can be polypropylene fiber nonwoven fabric, polyester fiber nonwoven fabric, nylon fiber nonwoven fabric, viscose fiber nonwoven fabric, etc., and the resin-impregnated layer can be polyethersulfone resin, phenoxy resin, epoxy resin, polyester resin, etc.

[0068] For example, the first preset temperature threshold is set in the range of 10℃-20℃.

[0069] According to the battery device 100 provided in this application, by providing at least one thermal control pad 31 between two adjacent battery cells 20, the battery cells 20 generate heat and their temperature gradually increases during use. At this time, the thermal control pad 31 absorbs the heat generated by the two adjacent battery cells 20 to reduce the temperature of the battery cells 20 themselves. When the temperature of the thermal control pad 31 reaches a first preset threshold, it can change from a first state to a second state. In the second state, the thermal conductivity of the thermal control pad 31 is reduced, which plays a temporary heat insulation role and enables the thermal control pad 31 to play a certain heat-insulating role, thereby slowing down the heat transfer between the battery cells 20. This helps to reduce the risk of thermal runaway of the battery device 100, thereby reducing the risk of fire or explosion of the battery device 100 and improving the stability and safety of the battery device 100.

[0070] Please see Figures 2 to 4 , Figure 4 This is a schematic diagram of the assembly structure of a temperature control component and a battery device 100 according to one embodiment of this application. According to some embodiments of this application, the temperature control component further includes a cooling component 32, which is disposed between two adjacent battery cells 20, and a thermal control pad 31 is respectively disposed on opposite sides of the cooling component 32. The cooling component 32 is configured to absorb heat when the temperature reaches a second preset temperature threshold, which is greater than a first preset temperature threshold.

[0071] For example, the second preset temperature threshold can be set in the range of 20℃-50℃.

[0072] Two thermal control pads 31 are provided between two adjacent battery cells 20, and a cooling component 32 is also provided between the two thermal control pads 31, so that each thermal control pad 31 is adjacent to a battery cell 20. The cooling component 32 can absorb heat when the temperature is higher than a first preset temperature threshold and reaches a second preset temperature threshold, thereby realizing graded control of the temperature between battery cells 20. It can absorb heat when the thermal control pads 31 can no longer absorb heat, thereby realizing graded control of the temperature between battery cells 20, further reducing the risk of thermal runaway of the battery device 100, and further improving the stability and safety of the battery device 100.

[0073] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a cooling assembly 32 provided in some embodiments of this application. According to some embodiments of this application, the cooling assembly 32 includes a housing and a first heat absorber 321. The housing defines an accommodating space, and the surface of the housing is provided with a through hole 325; the first heat absorber 321 is disposed in the accommodating space, and the first heat absorber 321 is configured to absorb heat when the temperature reaches a second preset temperature threshold.

[0074] For example, the housing is a rectangular housing with multiple surfaces and multiple through holes 325 on the multiple surfaces.

[0075] In some embodiments, the first heat absorber 321 includes a first encapsulation body having a plurality of first adsorption pores filled with a first phase change material.

[0076] For example, the first phase change material can be n-octadecane, lauric acid, etc.

[0077] The housing of the cooling assembly 32 is provided with a through hole 325 for airflow. The first heat absorber 321 is disposed in the housing space and can further absorb the heat generated by the battery cell 20 when the temperature is higher than the first preset temperature threshold and reaches the second preset temperature threshold. Then, the heat is converted into its own latent heat through a change of state. Since the second preset temperature threshold is greater than the first preset temperature threshold, after the thermal control pad performs first-stage heat absorption, the first heat absorber performs second-stage heat absorption, thereby achieving graded control of the temperature between the battery cells 20.

[0078] Please see Figure 5According to some embodiments of this application, the cooling assembly 32 further includes a separator 333 and a second heat absorber 322. The separator 333 is disposed within the receiving space and divides the receiving space into a first receiving space and a second receiving space. The first heat absorber 321 is housed in the first receiving space; the second heat absorber 322 is housed in the second receiving space. The second heat absorber 322 is configured to absorb heat when the temperature is greater than a third preset temperature threshold, wherein the third preset temperature threshold is greater than the second preset temperature threshold.

[0079] In some embodiments, the third preset temperature threshold can be set in the range of 50°C to 80°C.

[0080] The second phase change heating element 33 includes a second encapsulation body, which has a plurality of second adsorption holes, and the plurality of second adsorption holes are filled with a second phase change material.

[0081] For example, the second phase change material can be stearic acid, palmitic acid, chlorinated paraffin, etc.

[0082] The separator 333 divides the housing space into a first housing space and a second housing space. The first heat absorber 321 and the second heat absorber 322 are respectively disposed in the first housing space and the second housing space. The first heat absorber 321 and the second heat absorber 322 are triggered to absorb heat at different temperatures. Specifically, the first heat absorber 321 is triggered to absorb heat when the temperature reaches the second preset temperature threshold. If the temperature continues to rise and reaches the third preset temperature threshold, the second heat absorber 322 is triggered to absorb heat again and converts the heat into its own latent heat through a change of state. This can further achieve graded control of the temperature of the battery cell 20 and achieve a stepped cooling effect, thereby further reducing the risk of thermal runaway of the battery device 100.

[0083] According to some embodiments of this application, the separator 333 is configured to deform when the temperature reaches a third preset temperature threshold to open up the first and second accommodating spaces.

[0084] For example, the separator 333 may also be a thermoplastic resin material part.

[0085] The separator 333 is a heat-deformable separator 333. When the temperature of the cooling component 32 reaches the third preset temperature threshold, the separator 333 can deform, so that the first accommodating space and the second accommodating space are connected. After the first heat-absorbing component 321 and the second heat-absorbing component 322 come into contact, a rapid heat absorption reaction can occur, thereby improving the cooling efficiency of the battery cell 20.

[0086] Please see Figure 5 According to some embodiments of this application, a gap 324 is provided between the housing and the first heat absorber 321 and / or the second heat absorber 322.

[0087] Since the first heat absorber 321 and the second heat absorber 322 undergo a phase change when the endothermic reaction is triggered, by defining a gap 324 between the shell and the first heat absorber 321 and / or the second heat absorber 322, the first heat absorber 321 and the second heat absorber 322 can absorb heat and expand, thereby facilitating the first heat absorber 321 and the second heat absorber 322 to fully absorb heat, which helps to improve the cooling effect on the battery cell 20.

[0088] Please see Figure 3 and Figure 4 According to some embodiments of this application, the temperature control assembly further includes a heating element 33, which is disposed between the bottom plate of the battery box 10 and the plurality of batteries and between the plurality of battery cells 20 and the side plate of the battery box 10, for heating the plurality of battery cells 20.

[0089] For example, the heating element 33 can be a heating film, a heat-conducting plate with built-in heating wires, etc.

[0090] By providing a heating element 33 for heating the battery cells 20 inside the battery box 10, when the temperature of the battery cells 20 is lower than a minimum preset temperature threshold, the heating element 33 can heat the battery cells 20 to maintain their temperature within the optimal operating temperature range, thereby helping to improve the cycle life of the battery cells 20. The minimum preset temperature threshold can be set to 10℃.

[0091] Please see Figure 6 , Figure 6 This is a schematic diagram of the assembly structure of the temperature control component and the battery device 100 provided in another embodiment of this application. According to some embodiments of this application, the temperature control component further includes a control device 34 and a plurality of temperature sensors 34. The control device 34 is electrically connected to the heating element 33 and the plurality of temperature sensors 34, wherein each battery cell 20 is provided with at least one temperature sensor 34.

[0092] For example, each battery cell 20 is provided with a plurality of temperature sensors 34, which are spaced apart on the outer surface of the battery cell 20 to detect the temperature at multiple locations of the battery cell 20, and all of the plurality of temperature sensors 34 are electrically connected to the control device 34.

[0093] Specifically, the control device 34 may include an electronic control board, which may be equipped with a display screen that can display the temperature of each battery cell 20.

[0094] By using a temperature sensor 34 to detect the operating temperature of each battery cell 20 in real time, and the temperature sensor 34 can transmit the detected temperature to the control device 34 in real time, the control device 34 can control the heating element 33 to turn on and off according to the operating temperature of each battery cell 20, so as to achieve closed-loop control. The structure and principle are relatively simple and easy to implement.

[0095] According to some embodiments of this application, the heating element 33 includes a heating film.

[0096] Specifically, the heating film is an electric heating film, which may include a metal-based far-infrared radiation material. The metal-based far-infrared radiation material is enhanced with a specific chemical treatment method to make the temperature distribution of the heating area of ​​the heating film uniform and the heating is rapid. This allows for rapid and uniform heating of the battery cell 20, which helps to improve the heating efficiency of the battery cell 20.

[0097] In some embodiments, the heating film and the battery cell 20 can be directly thermally connected, or they can be thermally connected through thermally conductive materials such as thermally conductive adhesive.

[0098] The thin heating film helps reduce the space occupied inside the battery box 10 and is easy to install, which helps improve the uniformity of heating multiple battery cells 20.

[0099] According to some embodiments of this application, the thermal control gasket 31 includes a thermoplastic resin gasket.

[0100] Thermoplastic resin gaskets have a high thermal conductivity in the hardened state. When the temperature reaches the first preset temperature threshold, the thermoplastic resin gaskets absorb heat and can be in a softened state. When in the softened state, their thermal conductivity will decrease, thereby playing a certain role in heat insulation. This can reduce the transfer of heat between battery cells 20 to a certain extent and reduce the risk of thermal runaway in the battery device 100.

[0101] According to some embodiments of this application, see Figures 2 to 6This application provides a battery device 100, including a battery case 10, a temperature control component, and multiple battery cells 20. The battery case 10 has a receiving cavity in which the multiple battery cells 20 are housed. The temperature control component includes thermal control pads 31, a cooling component 32, a heating element 33, a temperature sensor 34, and a control device 34. The cooling component 32 is disposed between two adjacent battery cells 20. A thermal control pad 31 is disposed on each side of the cooling component 32 facing the battery cell 20. The thermal control pad 31 has a first state and a second state. The thermal control pad 31 is used to absorb heat from the battery cell 20, and is configured to switch from the first state to the second state when the temperature reaches a first preset temperature threshold, and switch from the second state to the first state when the temperature is below the first preset temperature threshold. The thermal conductivity of the thermal control pad 31 in the first state is greater than that in the second state. The cooling assembly 32 includes a housing and a partition 333, a first heat absorber 321, and a second heat absorber 322 disposed within the housing. The housing has multiple through holes. The partition 333 divides the accommodating space within the housing into a first accommodating space and a second accommodating space. The first heat absorber 321 is disposed within the first accommodating space, and the second heat absorber 322 is disposed within the second accommodating space. A gap 324 exists between the first heat absorber 321 and the second heat absorber 322 and the inner wall surface of the housing. The first heat absorber 321 is configured to absorb heat when the temperature reaches a second preset temperature threshold, and the second heat absorber 322 is configured to absorb heat when the temperature reaches a third preset temperature threshold. The second preset temperature threshold is greater than the first preset temperature threshold, and the third preset temperature threshold is greater than the second preset temperature threshold. The heating element 33 is thermally connected to multiple battery cells 20. Each battery cell 20 is provided with at least one temperature sensor 34. The control device 34 is electrically connected to the temperature sensor 34 and the heating element 33. The above technical solution can reduce the risk of fire or explosion caused by thermal runaway of the battery device 100, thereby improving the stability and safety of the battery device 100.

[0102] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery case, the battery case defining a receiving cavity; Multiple battery cells are housed within the receiving cavity; A temperature control component includes at least one thermal control pad, with at least one thermal control pad disposed between two adjacent battery cells. The thermal control pad has a first state and a second state. The thermal control pad is used to absorb heat from the battery cells, and the thermal control pad is configured to switch from the first state to the second state when the temperature reaches a first preset temperature threshold, and switch from the second state to the first state when the temperature is lower than the first preset temperature threshold. Wherein, the thermal conductivity of the thermal control pad in the first state is greater than the thermal conductivity of the thermal control pad in the second state.

2. The battery device according to claim 1, characterized in that, The temperature control component further includes a cooling component, which is disposed between two adjacent battery cells, and a thermal control pad is respectively disposed on each of the opposite sides of the cooling component. The cooling component is configured to absorb heat when the temperature reaches a second preset temperature threshold, where the second preset temperature threshold is greater than the first preset temperature threshold.

3. The battery device according to claim 2, characterized in that, The cooling assembly includes: A housing, the housing defining an accommodating space, and the surface of the housing having through holes; A first heat-absorbing element is disposed within the accommodating space, and the first heat-absorbing element is configured to absorb heat when the temperature reaches the second preset temperature threshold.

4. The battery device according to claim 3, characterized in that, The cooling assembly also includes: A separator is disposed within the accommodating space and divides the accommodating space into a first accommodating space and a second accommodating space, wherein the first heat-absorbing element is accommodated in the first accommodating space; A second heat-absorbing element is housed in the second receiving space, and the second heat-absorbing element is configured to absorb heat when the temperature is greater than a third preset temperature threshold. The third preset temperature threshold is greater than the second preset temperature threshold.

5. The battery device according to claim 4, characterized in that, The separator is configured to deform when the temperature reaches the third preset temperature threshold to connect the first accommodating space and the second accommodating space.

6. The battery device according to claim 4, characterized in that, There is a gap between the housing and the first heat-absorbing element, and / or there is a gap between the housing and the second heat-absorbing element.

7. The battery device according to claim 4, characterized in that, The first heat-absorbing element includes a first encapsulation body, the first encapsulation body having a plurality of first adsorption pores, and the first adsorption pores being filled with a first phase change material; And / or, the second heat absorber includes a second encapsulation body having a plurality of second adsorption pores filled with a second phase change material.

8. The battery device according to any one of claims 1-6, characterized in that, The temperature control component also includes a heating element, which is provided between the bottom plate of the battery box and the plurality of batteries and / or between the plurality of battery cells and the side plate of the battery box, for heating the plurality of battery cells.

9. The battery device according to claim 8, characterized in that, The temperature control assembly also includes a control device and multiple temperature sensors. The control device is electrically connected to the heating element and the multiple temperature sensors, wherein each battery cell is provided with at least one of the temperature sensors.

10. The battery device according to any one of claims 1-6, characterized in that, The thermal control pad includes a thermoplastic resin pad.

11. An electrical appliance, characterized in that, The battery device includes any one of claims 1-10, wherein the battery device is used to supply power to the electrical device.

Images