Battery device and electric device

Abstract

The embodiment of the invention provides a battery device and a power utilization device. The battery device comprises a box body assembly, a heat management assembly and a battery assembly, the battery assembly comprises a plurality of battery layers which are stacked along the height direction of the battery device, and the plurality of battery layers are arranged in the box body assembly. The heat management assembly comprises a heat exchange part and a heating part, the heat exchange part is internally provided with at least one medium flow channel, the at least one medium flow channel is used for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with the battery layer. And the heat exchange pieces are arranged among the multiple battery layers and are used for bearing at least part of the battery layers. The heating piece is arranged between the battery layer and the heat exchange piece, or the heating piece is arranged between the battery layer and the box body assembly. According to the battery device provided by the embodiment of the invention, the heat exchange efficiency can be improved while the energy density of the battery device is improved, and the cycle performance and the service life of the battery device can be improved and prolonged under a low-temperature working condition. Structure simplification and cost reduction are facilitated.

Description

Technical Field

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

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. In the related art, a single-layer battery layer arrangement is adopted, but the single-layer battery device may have problems such as low energy density and limited power. In addition, in a cold environment, the temperature of the battery device may be low, which may affect the cycle performance and service life of the battery device. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a battery device and an electrical device, which can improve the energy density of the battery device while enhancing the cycle performance of the battery device.

[0004] To this end, a first aspect of an embodiment of the present application provides a battery device, including: Box components; A battery assembly, the battery assembly comprising a plurality of battery layers stacked along a height direction of the battery device, the plurality of battery layers being arranged in the box assembly; A thermal management component, the thermal management component comprising a heat exchange element and a heating element, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the battery layer; Wherein, the heat exchange element is arranged between multiple battery layers, and the heat exchange element is used to support at least part of the battery layer; the heating element is arranged between the battery layer and the heat exchange element, or the heating element is arranged between the battery layer and the box assembly.

[0005] The battery device provided by the embodiment of the present application includes a box assembly, a thermal management assembly and a battery assembly, wherein the battery layer is arranged in the box assembly, and the box assembly plays a protective role on the battery layer. On the one hand, by arranging multiple battery layers, it is beneficial to increase the power of the battery device. In addition, stacking the battery layers along the height direction of the battery device is also beneficial to fully utilize the space in the box assembly, thereby improving the energy density of the battery device. On the other hand, by arranging the heat exchange element between the multiple battery layers, the battery layers located on the opposite sides of the heat exchange element can be simultaneously heat exchanged, which is beneficial to improve the heat exchange efficiency of the heat exchange element to the battery layer. That is to say, while improving the energy density of the battery device, the heat exchange efficiency can also be improved. In addition, by arranging a heating element between the battery layer and the heat exchange element, or by arranging a heating element between the battery layer and the box assembly, when the battery layer needs to be heated, the heat generated by the heating element can be transferred to the battery layer, so that the battery layer can be heated under low temperature conditions, thereby improving the cycle performance and service life of the battery device. In addition, the structure of heating the battery layer by the heating element is simple, and there is no need to heat the heat exchange medium by additionally arranging a heating device, which is beneficial to simplify the structure and reduce costs. In addition, when the heating element is disposed between adjacent battery layers, the heating element can heat the adjacent battery layers simultaneously, thereby improving the heating efficiency.

[0006] In some embodiments, the plurality of battery layers include a first battery layer and a second battery layer disposed adjacent to each other, wherein the second battery layer is located above the first battery layer; A first matching plane is formed on a side of the heat exchange element facing the first battery layer, and the heating element is arranged between the first matching plane and the first battery layer.

[0007] In this embodiment, a first matching plane is formed on the side of the heat exchanger facing the first battery layer, and a heating element is arranged between the first matching plane and the first battery layer. In this way, the heating element can better match the first battery layer and the heat exchanger.

[0008] In some embodiments, the heating element is attached to the first matching plane.

[0009] Here, by attaching the heating element to the first matching plane, the arrangement of the heating element is facilitated so that the heating element can better fit the heat exchange element.

[0010] In some embodiments, the heat exchange element includes at least two heat exchange plates, the heat exchange plates include a first heat exchange plate and a second heat exchange plate, a partial area of ​​the first heat exchange plate protrudes to form the protrusion, the first heat exchange plate and the second heat exchange plate are stacked, the medium flow channel is defined between the protrusion and the second heat exchange plate, and the side of the second heat exchange plate facing away from the first heat exchange plate forms the first mating plane.

[0011] This helps improve the design flexibility of the heat exchanger, and the size and path of the medium flow channel can be freely designed, which is suitable for complex scenarios with irregular heat source distribution or limited space, and helps to further improve the heat exchange efficiency. In addition, by providing at least one heat exchange plate with a protrusion to form a medium flow channel on the protrusion, it is further helpful to improve the design flexibility.

[0012] In some embodiments, each of the battery layers includes a plurality of battery cells arranged along a first direction, the battery assembly also includes at least one end plate, the end plate is provided at at least one end of the battery layer along the first direction, the heat exchange element is connected to the end plate at at least one end along the first direction, and the first direction intersects with the height direction of the battery device.

[0013] In this embodiment, an end plate is provided at at least one end of the battery layer along the first direction, and at least one end of the heat exchanger along the first direction is connected to the end plate. This helps the heat exchanger to transfer the force it receives to the frame through the end plate, thereby improving the supporting strength of the battery layer and reducing the possibility of squeezing and damaging the battery layers below due to excessive stacking, thereby improving the capacity of the battery device and the reliability of the battery device.

[0014] In some embodiments, a first flange portion is formed at at least one end of the heat exchange element along the first direction, and the first flange portion is connected to the end plate.

[0015] That is to say, the heat exchange element is folded toward the end plate to form a first flange portion, and is connected to the end plate through the first flange portion. The connection structure is simple, reliable, and easy to form.

[0016] In some embodiments, the heat exchange element is fastened, clamped or welded to the end plate.

[0017] The connection structure is simple and reliable.

[0018] In some embodiments, the heating element is disposed on top of the uppermost battery layer.

[0019] In this way, the top of the uppermost battery layer is heated, further improving the reliability of the battery device.

[0020] In some embodiments, the thermal management component further includes an upper cover, which is disposed on top of the uppermost battery layer, and the heating element is disposed between the upper cover and the uppermost battery layer.

[0021] In this embodiment, an upper cover is provided and a heating element is provided between the upper cover and the uppermost battery layer, which facilitates the installation of the heating element so that the heating element can better fit the heat exchange element and can protect the heating element, thereby improving the reliability of the thermal management component.

[0022] In some embodiments, each of the battery layers includes a plurality of battery cells arranged along a first direction, and the battery assembly further includes at least one end plate, and the end plate is disposed at at least one end of the battery layer along the first direction; A second flange portion is formed at at least one end of the upper cover along the first direction, and the second flange portion is connected to the end plate.

[0023] That is to say, the upper cover is folded toward the end plate to form a second flange portion, and is connected to the end plate through the second flange portion. The connection structure is simple, reliable, and easy to form.

[0024] In some embodiments, the second flange portion is fastened, clamped or welded to the end plate.

[0025] The connection structure is simple and reliable.

[0026] In some embodiments, the dimension of the battery cell along the height direction of the battery device and the dimension of the battery cell along the first direction are smaller than the dimension of the battery cell along the second direction, the first direction, the second direction and the height direction of the battery device intersect, and the dimension of the battery cell along the second direction is in the range of 300 mm to 1200 mm.

[0027] In this embodiment, by setting the size of the battery cell along the second direction to be in the range of 300 mm to 1200 mm, both the capacity and the assembly efficiency of the battery device can be taken into consideration.

[0028] In some embodiments, each of the battery layers includes a plurality of battery cells arranged along a first direction, and the battery cells further include poles and / or pressure relief structures, and the poles and / or pressure relief structures are arranged on at least one side of the battery cells along a second direction, and the first direction, the second direction and the height direction of the battery device intersect.

[0029] In this embodiment, by arranging the pole and / or the pressure relief structure on at least one side of the battery cell along the second direction, on the one hand, it is helpful to improve the structural compactness of the battery device, and on the other hand, it is also helpful to reduce the damage to the pole and / or the pressure relief structure during the stacking of battery cells and / or battery layers.

[0030] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery device described above.

[0031] The battery device of the electric device provided in the embodiment of the present application includes a box assembly, a thermal management assembly and a battery assembly, wherein the battery layer is arranged in the box assembly, and the box assembly plays a protective role on the battery layer. On the one hand, by arranging multiple battery layers, it is beneficial to increase the power of the battery device. In addition, stacking the battery layers along the height direction of the battery device is also beneficial to fully utilize the space in the box assembly, thereby improving the energy density of the battery device. On the other hand, by arranging the heat exchange element between the multiple battery layers, the battery layers located on the opposite sides of the heat exchange element can be simultaneously heat exchanged, which is beneficial to improve the heat exchange efficiency of the heat exchange element to the battery layer. That is to say, while improving the energy density of the battery device, the heat exchange efficiency can also be improved. In addition, by arranging a heating element between the battery layer and the heat exchange element, or by arranging a heating element between the battery layer and the box assembly, when the battery layer needs to be heated, the heat generated by the heating element can be transferred to the battery layer, so that the battery layer can be heated under low temperature conditions, thereby improving the cycle performance and service life of the battery device. In addition, the structure of heating the battery layer by the heating element is simple, and there is no need to heat the heat exchange medium by additionally arranging a heating device, which is beneficial to simplify the structure and reduce costs. In addition, when the heating element is disposed between adjacent battery layers, the heating element can heat the adjacent battery layers simultaneously, thereby improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present disclosure; Figure 2 A schematic diagram of the structure of a battery device provided in one embodiment of the present disclosure; Figure 3 A three-dimensional exploded schematic diagram of a battery device provided in one embodiment of the present disclosure; Figure 4 A partial exploded schematic diagram of a battery device provided in the first embodiment of the present disclosure; Figure 5 A schematic diagram of the connection structure between a battery assembly and a heat exchange element provided in one embodiment of the present disclosure; Figure 6 for Figure 5 The enlarged view of point A in the middle; Figure 7 A partial exploded schematic diagram of a battery device provided in a second embodiment of the present disclosure; Figure 8 A schematic diagram of the connection structure between a baffle and a heat exchanger provided in one embodiment of the present disclosure.

[0033] Description of Reference Numerals 10. Battery layer; 11. Battery cell; 111. Post; 12. First battery layer; 13. Second battery layer; 20. Box assembly; 21. First box portion; 22. Second box portion; 30. Thermal management assembly; 31. Heat exchanger; 311. First heat exchange plate; 3111. First surface; 312. Second heat exchange plate; 3121. First mating plane; 313. Protrusion; 314. Medium flow channel; 31 5. First flange portion; 316. First flow channel group; 317. Second flow channel group; 318. Liquid inlet; 319. Liquid outlet; 32. Heating element; 33. Upper cover; 331. Second flange portion; 40. Blocking element; 50. End plate; 51. First end plate; 52. Second end plate; 53. Third end plate; 54. Fourth end plate; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0034] If not otherwise specified, all embodiments and optional embodiments of the present disclosure may be combined with each other to form a new technical solution.

[0035] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form a new technical solution.

[0036] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0037] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0038] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited thereto.

[0039] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0040] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0041] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0042] In some embodiments, the electrode assembly is a laminate structure.

[0043] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0044] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0045] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0046] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0047] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0048] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0049] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0050] In some embodiments, the battery cell may include a shell. The shell 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. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0051] As an example, the battery cell can 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 a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present disclosure.

[0052] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0053] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0054] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0055] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. In the related art, a single-layer battery layer arrangement is adopted, but the single-layer battery device may have problems such as low energy density and limited power. In addition, in a cold environment, the temperature of the battery device may be low, which may affect the cycle performance and service life of the battery device.

[0056] In view of this, in order to improve the energy density of the battery device while improving the cycle performance of the battery device, an embodiment of the present disclosure provides a battery device, which includes a box assembly, a thermal management assembly and a battery assembly. The battery assembly includes multiple battery layers stacked along the height direction of the battery device, and the multiple battery layers are arranged in the box assembly. The thermal management assembly includes a heat exchanger and a heating element, and the heat exchanger has at least one medium flow channel inside, and at least one medium flow channel is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with the battery layer. Among them, the heat exchanger is arranged between the multiple battery layers, and the heat exchanger is used to carry at least part of the battery layer. The heating element is arranged between the battery layer and the heat exchanger, or the heating element is arranged between the battery layer and the box assembly.

[0057] The battery device provided by the embodiment of the present application includes a box assembly, a thermal management assembly and a battery assembly, wherein the battery layer is arranged in the box assembly, and the box assembly plays a protective role on the battery layer. On the one hand, by arranging multiple battery layers, it is beneficial to increase the power of the battery device. In addition, stacking the battery layers along the height direction of the battery device is also beneficial to fully utilize the space in the box assembly, thereby improving the energy density of the battery device. On the other hand, by arranging the heat exchange element between the multiple battery layers, the battery layers located on the opposite sides of the heat exchange element can be simultaneously heat exchanged, which is beneficial to improve the heat exchange efficiency of the heat exchange element to the battery layer. That is to say, while improving the energy density of the battery device, the heat exchange efficiency can also be improved. In addition, by arranging a heating element between the battery layer and the heat exchange element, or by arranging a heating element between the battery layer and the box assembly, when the battery layer needs to be heated, the heat generated by the heating element can be transferred to the battery layer, so that the battery layer can be heated under low temperature conditions, thereby improving the cycle performance and service life of the battery device. In addition, the structure of heating the battery layer by the heating element is simple, and there is no need to heat the heat exchange medium by additionally arranging a heating device, which is beneficial to simplify the structure and reduce costs. In addition, when the heating element is disposed between adjacent battery layers, the heating element can heat the adjacent battery layers simultaneously, thereby improving the heating efficiency.

[0058] The technical solution described in the embodiments of the present disclosure is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present disclosure, and the battery device is used to provide electric energy.

[0059] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present disclosure do not impose any special restrictions on the above-mentioned electrical devices.

[0060] It should be noted that the technical solutions described in the embodiments of the present disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0061] Please refer to Figure 1, a controller 200, a motor 300 and a battery device 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may 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.

[0062] See also Figures 2 to 8 The embodiment of the present disclosure provides a battery device 100, which includes a box assembly 20, a thermal management assembly 30 and a battery assembly. The battery assembly includes multiple battery layers 10 stacked along the height direction of the battery device 100, and the multiple battery layers 10 are arranged in the box assembly 20. The thermal management assembly 30 includes a heat exchanger 31 and a heater 32. The heat exchanger 31 has at least one medium flow channel 314 inside. The at least one medium flow channel 314 is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with the battery layer 10. Among them, the heat exchanger 31 is arranged between the multiple battery layers 10, and the heat exchanger 31 is used to carry at least part of the battery layer 10. The heater 32 is arranged between the battery layer 10 and the heat exchanger 31, or the heater 32 is arranged between the battery layer 10 and the box assembly 20.

[0063] The multi-layer described in the embodiments of the present application refers to two or more layers.

[0064] In order to meet different power requirements, the battery assembly of the battery device 100 includes multiple battery layers 10 stacked in the height direction, and each battery layer 10 includes multiple battery cells 11. The battery cell 11 refers to the smallest unit that constitutes a battery module or a battery pack. Multiple battery cells 11 can be connected in series, in parallel, or in hybrid connection. Hybrid connection means that multiple battery cells 11 are both connected in series and in parallel. Multiple battery cells 11 can be directly connected in series, in parallel, or in hybrid connection, and then the whole formed by multiple battery cells 11 is accommodated in the box assembly 20; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 11 in series, in parallel, or in hybrid connection, and then multiple battery modules are connected in series, in parallel, or in hybrid connection to form a whole, and are accommodated in the box assembly 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a converging component for realizing electrical connection between multiple battery cells 11. Among them, each battery cell 11 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 it is not limited to this. The battery cell 11 may be cylindrical, flat, rectangular or in other shapes.

[0065] The box assembly 20 can be a simple three-dimensional structure such as a single cuboid, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the box assembly 20 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin.

[0066] The box assembly 20 is used to encapsulate the battery cell 11 , and the box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 11 .

[0067] Exemplarily, the box assembly 20 is generally a rectangular parallelepiped structure, the length and width directions of the box assembly 20 are parallel to the horizontal plane, and the length direction of the box assembly 20 is parallel to the longest side of the rectangular parallelepiped structure of the box assembly 20. The height direction of the box assembly 20 is perpendicular to the ground. For example, see Figure 2 , Figure 7 and Figure 8 The first direction is represented by X, the second direction is represented by Y, and the height direction of the battery device is represented by Z. It should be noted that the specific type of the heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 11, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a cooling liquid.

[0068] It should be noted that the specific number of the medium flow channels 314 is not limited here, and can be one or more.

[0069] For example, see Figures 5 and 6 The heat exchange element 31 includes at least two heat exchange plates, and the at least two heat exchange plates are stacked to form at least one medium flow channel 314, that is, the number of the heat exchange plates is multiple.

[0070] Exemplarily, the heat exchange plate is a plate-like structure, which may have a certain structural strength and supporting strength, thereby facilitating improving the overall structural strength and stability of the thermal management component 30 .

[0071] For example, the heat exchange plate can also be stamped or welded to form a specific structure according to needs for supporting purposes.

[0072] For example, see Figures 7 and 8 The thermal management component 30 further includes a liquid inlet 318 and a liquid outlet 319 , and both the liquid inlet 318 and the liquid outlet 319 are in communication with the medium flow channel 314 .

[0073] Here, the liquid inlet 318 and the liquid outlet 319 of the thermal management component 30 are used to connect with pipelines of liquid storage devices such as an air conditioning system or a water tank of the entire vehicle or an electrical device.

[0074] The principle of heat exchange of the battery cell 11 by the thermal management component 30 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 314 through the liquid inlet 318 of the thermal management component 30, and after the heat exchange medium exchanges heat with the battery cell 11, the heat exchange medium flows out through the liquid outlet 319 of the thermal management component 30, thereby completing the heat exchange of the battery cell 11.

[0075] Here, the heat management component 30 exchanging heat on the battery cell 11 may be to dissipate heat from the battery cell 11 , or may be to heat the battery cell 11 .

[0076] The principle of heat dissipation of the battery cell 11 by the thermal management component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 314 through the liquid inlet 318 of the thermal management component 30. After the heat exchange medium absorbs the heat generated by the battery cell 11 during operation, the heat exchange medium flows out through the liquid outlet 319 of the thermal management component 30 to release the heat, thereby completing the cooling and heat dissipation of the battery cell 11.

[0077] The principle of the thermal management component 30 heating the battery cell 11 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 314 through the liquid inlet 318 of the thermal management component 30, and the heat exchange medium transfers heat to the battery cell 11. After heating the battery cell 11, the heat exchange medium flows out through the liquid outlet 319 of the thermal management component 30, completing the heating of the battery cell 11.

[0078] The box assembly 20 is used to accommodate the battery cell 11. The box assembly 20 can be of various structures. Figure 2 and Figure 3 The box assembly 20 may include a first box portion 21 and a second box portion 22 . The first box portion 21 and the second box portion 22 cover each other to define an accommodation space for accommodating the battery cell 11 .

[0079] In order to improve the sealing performance after the first box body 21 and the second box body 22 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 21 and the second box body 22 .

[0080] Assuming that the first box body portion 21 covers the top of the second box body portion 22 , the first box body portion 21 can also be referred to as an upper box cover, and the second box body portion 22 can also be referred to as a lower box cover.

[0081] Exemplarily, at least one heat exchange plate has a protrusion 313 , and a medium flow channel 314 is formed in the protrusion 313 .

[0082] Here, at least one heat exchange plate is provided with a protrusion 313 , and a medium flow channel 314 is formed in the protrusion 313 , that is, the protrusion 313 can be set to a desired shape according to needs, thereby facilitating the improvement of the design flexibility of the medium flow channel 314 .

[0083] In some embodiments, see Figure 8 , the medium flow channel 314 includes a bending section.

[0084] Here, the size and path of the medium flow channel 314 can be freely designed according to the heat distribution or spatial distribution of the battery cell 11. For example, by setting the medium flow channel 314 to include a bending section, it is helpful to improve the heat exchange efficiency and assembly convenience.

[0085] For example, the heat exchange plate may be formed with the protrusions 313 by stamping.

[0086] Here, the specific material of the heat exchange plate is not limited.

[0087] In some embodiments, the heat exchange plate is configured as a metal plate. For example, the material of the heat exchange plate may be aluminum alloy, steel, etc.

[0088] The materials of different heat exchange plates can be the same or different.

[0089] In this embodiment, by setting the heat exchange plate as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange element 31 with a certain heat exchange efficiency, the heat exchange plate can also have a certain structural strength.

[0090] Exemplarily, at least two heat exchange plates are connected by welding. That is, the heat exchange plates are connected by welding to form the heat exchange element 31, which is conducive to improving the reliability of the connection structure between the heat exchange plates.

[0091] Exemplarily, the heat exchange plates are connected by brazing.

[0092] Brazing can combine dissimilar metals (such as aluminum-based composite materials) through hot rolling composite processes, so that the material has high mechanical strength, corrosion resistance and fatigue resistance, and is suitable for load-bearing and harsh environments. In addition, the brazed joint has good air tightness and liquid tightness, supporting the dissimilar connection of various metals and alloys. In addition, the size and path of the medium flow channel 314 can be freely designed, which is suitable for complex scenarios with irregular heat source distribution or limited space.

[0093] By configuring the heat exchanger 31 to include at least two heat exchange plates, at least two heat exchange plates are stacked to form at least one medium flow channel 314, the design flexibility of the heat exchanger 31 is improved. The size and path of the medium flow channel 314 can be freely designed, which is suitable for complex scenes with irregular heat source distribution or limited space, and is conducive to further improving the heat exchange efficiency. In addition, by configuring at least one heat exchange plate with a protrusion 313, a medium flow channel 314 is formed on the protrusion 313, which is further conducive to improving the design flexibility.

[0094] Exemplarily, the heat exchange element 31 and the battery layer 10 can be bonded by gluing, and the provision of the barrier element 40 can block the glue, thereby improving the situation where the glue overflows.

[0095] For example, see Figures 5 to 8 The first surface 3111 of the heat exchange element 31 is configured to support the battery layer 10. The barrier 40 is disposed on the first surface 3111, and the barrier 40 abuts between the battery layer 10 and the first surface 3111.

[0096] The barrier 40 abuts between the battery layer 10 and the first surface 3111, that is, the upper battery layer 10 is pressed on the barrier 40 instead of on the heat exchanger 31. The barrier 40 can play a supporting role, thus avoiding the battery layer 10 from crushing the medium flow channel 314 to a certain extent.

[0097] Exemplarily, the barrier 40 may be higher than the protrusion 313 , and a medium flow channel 314 is formed in the protrusion 313 so that the upper battery layer 10 is pressed on the barrier 40 instead of the protrusion 313 .

[0098] By configuring the first surface 3111 of the heat exchanger 31 to carry the battery layer 10, and placing the barrier 40 between the battery layer 10 and the first surface 3111, that is, by pressing the upper battery layer 10 on the barrier 40, the barrier 40 can play a supporting role, thereby improving the situation where the upper battery layer 10 is pressed on the medium flow channel 314, thereby reducing the possibility of the upper battery layer 10 crushing the medium flow channel 314, which is beneficial to improving the reliability of the battery device 100. In addition, the provision of the barrier 40 can also play a role in blocking the adhesive, thereby improving the situation where the adhesive overflows to the outside of the battery layer 10.

[0099] Exemplarily, the heating element 32 may be a heating film, and further, the heating element 32 may be an electric heating film.

[0100] Exemplarily, the heating element 32 has a heating resistor inside, which generates heat when powered on to heat the battery layer 10 .

[0101] See also Figures 4 to 6 The heating element 32 is disposed between the battery layer 10 and the heat exchange element 31 , that is, the heat exchange element 31 is in contact with the battery layer 10 through the heating element 32 .

[0102] When the battery layer 10 needs to be heated, the heat generated by the heating element 32 can be directly transferred to the battery layer 10, or it can be transferred to the battery layer 10 through the heat exchange element 31. The material of the heat exchange element 31 itself can better transfer the heat generated by the heating element 32 to the battery layer 10. In this way, the heating element 32 can heat two adjacent battery layers 10 at the same time, thereby improving the heating efficiency.

[0103] When the battery layer 10 needs to be cooled, the cold energy generated by the heat exchange element 31 can be directly transferred to the battery layer 10 , or it can be transferred to the battery layer 10 through the heating element 32 (the heating element 32 does not generate heat at this time) to achieve heat dissipation of the battery layer 10 .

[0104] For example, the heating element 32 may be first attached to the surface of the heat exchange element 31, and then the heat exchange element 31 and the heating element 32 are matched with the battery layer 10, for example, by gluing and fixing. Of course, the heating element 32 may also be first attached to the battery layer 10, and then the heat exchange element 31, the heating element 32 and the battery layer 10 are fixed by gluing.

[0105] The battery device 100 provided in the embodiment of the present application includes a box assembly 20 , a thermal management assembly 30 and a battery assembly. The battery layer 10 is arranged in the box assembly 20 , and the box assembly 20 protects the battery layer 10 . On the one hand, by arranging multiple battery layers 10, it is beneficial to increase the power of the battery device 100. In addition, stacking the battery layers 10 along the height direction of the battery device 100 is also beneficial to fully utilize the space in the box assembly 20, thereby improving the energy density of the battery device 100. On the other hand, by arranging the heat exchange element 31 between the multiple battery layers 10, the battery layers 10 located on opposite sides of the heat exchange element 31 can be simultaneously heat exchanged, which is beneficial to improve the heat exchange efficiency of the heat exchange element 31 to the battery layer 10. That is to say, while improving the energy density of the battery device 100, the heat exchange efficiency can also be improved. In addition, by arranging a heating element 32 between the battery layer 10 and the heat exchange element 31, or arranging a heating element 32 between the battery layer 10 and the box assembly 20, when the battery layer 10 needs to be heated, the heat generated by the heating element 32 can be transferred to the battery layer 10, so that the battery layer 10 can be heated under low temperature conditions without the need to heat the heat exchange medium by additionally arranging a heating device, thereby improving the cycle performance and service life of the battery device. In addition, the structure of heating the battery layer by the heating element is simple, which is conducive to simplifying the structure and reducing costs. In addition, when the heating element 32 is arranged between adjacent battery layers 10, the heating element 32 can heat the adjacent battery layers 10 at the same time, thereby improving the heating efficiency.

[0106] Here, there are various cases where at least one heat exchange plate has the protrusion 313 .

[0107] In some embodiments, see Figures 5 to 8 The heat exchange element 31 includes at least two heat exchange plates, the heat exchange plates include a first heat exchange plate 311 and a second heat exchange plate 312, a partial area of ​​the first heat exchange plate 311 protrudes to form a protrusion 313, the first heat exchange plate 311 and the second heat exchange plate 312 are stacked, and a medium flow channel 314 is defined between the protrusion 313 and the second heat exchange plate 312.

[0108] That is to say, only a partial area of ​​the first heat exchange plate 311 needs to be protruded to form the protrusion 313, and the second heat exchange plate 312 does not need to form the protrusion 313, which is beneficial to reducing the process of forming the protrusion 313 on the second heat exchange plate 312, and can reduce the difficulty of positioning between the first heat exchange plate 311 and the second heat exchange plate 312, which is beneficial to improving production efficiency.

[0109] In some other embodiments, a partial area of ​​the first heat exchange plate 311 and a partial area of ​​the second heat exchange plate 312 both protrude to form a protrusion 313 .

[0110] Exemplarily, the first heat exchange plate 311 is disposed above the second heat exchange plate 312 , so that the first heat exchange plate 311 has a first surface 3111 .

[0111] In some embodiments, the first surface 3111 is a surface of the first heat exchange plate 311 facing away from the second heat exchange plate 312 .

[0112] Here, the raised portion 313 of the first heat exchange plate 311 and the raised portion 313 of the second heat exchange plate 312 can be arranged relative to each other, so that a medium flow channel 314 is formed between the raised portion 313 of the first heat exchange plate 311 and the raised portion 313 of the second heat exchange plate 312; or the raised portion 313 of the first heat exchange plate 311 and the raised portion 313 of the second heat exchange plate 312 are staggered, so that a medium flow channel 314 is formed between the raised portion 313 of the first heat exchange plate 311 and the non-raised portion of the second heat exchange plate 312, and a medium flow channel 314 is formed between the raised portion 313 of the second heat exchange plate 312 and the non-raised portion of the first heat exchange plate 311.

[0113] In some embodiments, see Figures 5 and 6 The multi-layer battery layer 10 includes a first battery layer 12 and a second battery layer 13 arranged adjacent to each other, and the second battery layer 13 is located above the first battery layer 12. A first matching plane 3121 is formed on the side of the heat exchange element 31 facing the first battery layer 12, and a heating element 32 is arranged between the first matching plane 3121 and the first battery layer 12.

[0114] Exemplarily, a first mating plane 3121 is formed on a side of the second heat exchange plate 312 facing away from the first heat exchange plate 311 , the first mating plane 3121 faces the first battery layer 12 , and the first heat exchange plate 311 faces the second battery layer 13 .

[0115] In addition to the first battery layer 12 and the second battery layer 13 , the multi-layer battery layer 10 may also include other battery layers 10 , for example, a third battery layer 10 , etc. The third battery layer 10 may be located below the first battery layer 12 or above the second battery layer 13 .

[0116] A heat exchange element 31 is disposed between the first battery layer 12 and the second battery layer 13 .

[0117] Here, the first heat exchange plate 311 and the second heat exchange plate 312 are stacked, the first heat exchange plate 311 is located above the second heat exchange plate 312, and a first mating plane 3121 is formed on the side of the second heat exchange plate 312 facing away from the first heat exchange plate 311, that is, the first mating plane 3121 is used to cooperate with the first battery layer 12, and the protrusion 313 is arranged on the side of the heat exchange element 31 facing the second battery layer 13.

[0118] In this embodiment, a first matching plane 3121 is formed on the side of the heat exchange element 31 facing the first battery layer 12, and a heating element 32 is arranged between the first matching plane 3121 and the first battery layer 12, so that the heating element 32 can better match the first battery layer 12 and the heat exchange element 31.

[0119] Exemplarily, the heating element 32 is attached to the first matching plane 3121 .

[0120] That is to say, the heating element 32 may be first attached to the first mating plane 3121 to form a pre-assembled component of the heating element 32 and the heat exchange element 31, and then the pre-assembled component is matched with the first battery layer 12, for example, fixed by gluing.

[0121] Of course, the heating element 32 and the first battery layer 12 may be firstly attached to form a pre-assembled component of the heating element 32 and the first battery layer 12 , and then the pre-assembled component and the heat exchange element 31 may be fixed by gluing.

[0122] Here, by attaching the heating element 32 to the first matching plane 3121 , the arrangement of the heating element 32 is facilitated so that the heating element 32 can better fit with the heat exchange element 31 .

[0123] In some embodiments, see Figures 7 and 8 The heat exchange element 31 includes a first flow channel group 316 and a second flow channel group 317. The first flow channel group 316 includes a liquid inlet 318 and at least one medium flow channel 314. The second flow channel group 317 includes a liquid outlet 319 and at least one medium flow channel 314. One end of the medium flow channel 314 of the first flow channel group 316 is connected to the liquid inlet 318, one end of the medium flow channel 314 of the second flow channel group 317 is connected to the liquid outlet 319, and one end of the medium flow channel 314 of the first flow channel group 316 away from the liquid inlet 318 is connected to one end of the medium flow channel 314 of the second flow channel group 317 away from the liquid outlet 319.

[0124] That is, the heat exchange medium flows from the liquid inlet 318 into the medium flow channel 314 of the first flow channel group 316 , then flows into the medium flow channel 314 of the second flow channel group 317 , and flows out from the liquid outlet 319 .

[0125] In the embodiment where the first flow channel group 316 includes a plurality of medium flow channels 314 , the same end of the plurality of medium flow channels 314 of the first flow channel group 316 is in communication with the liquid inlet 318 .

[0126] In the embodiment where the second flow channel group 317 includes a plurality of medium flow channels 314 , the same end of the plurality of medium flow channels 314 of the second flow channel group 317 is in communication with the liquid outlet 319 .

[0127] In this embodiment, by configuring the heat exchange element 31 to include a first flow channel group 316 and a second flow channel group 317, so that the medium flow channel 314 of the first flow channel group 316 is connected to the liquid inlet 318, and the medium flow channel 314 of the second flow channel group 317 is connected to the liquid outlet 319, the size and path of the medium flow channel 314 can be freely designed according to the heat distribution or spatial distribution of the battery cell 11, which is beneficial to further improve the heat exchange efficiency.

[0128] In some embodiments, see Figures 5 to 8 Each battery layer 10 includes a plurality of battery cells 11 arranged along a first direction, the medium flow channel 314 extends along the first direction, the first flow channel group 316 and the second flow channel group 317 are arranged along a second direction, and the first direction intersects the second direction.

[0129] Here, the liquid inlet 318 and the liquid outlet 319 may be located on the same side of the heat exchange element 31 along the first direction, or may be located on different sides of the heat exchange element 31 along the first direction.

[0130] In this embodiment, by setting the arrangement direction of the battery cells 11 and the extension direction of the medium flow channel 314 to be the same, it is helpful to improve the uniformity of heat exchange, thereby helping to improve the temperature uniformity of the battery cells 11.

[0131] In some embodiments, see Figures 6 to 8 , the dimension h1 of the battery cell 11 along the height direction of the battery device 100 and the dimension h2 of the battery cell 11 along the first direction are smaller than the dimension h3 of the battery cell 11 along the second direction, the first direction, the second direction and the height direction of the battery device 100 intersect, and the dimension of the battery cell 11 along the second direction is in the range of 300 mm to 1200 mm.

[0132] The size of the battery cell 11 along the second direction can be any one of 300mm, 350mm, 400mm, 450mm, 500mm, 560mm, 600mm, 650mm, 700mm, 780mm, 800mm, 830mm, 860mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm, 1150mm, and 1200mm, or any value between any two of them.

[0133] Here, h1, h2, and h3 may be measured by a measuring tool such as a vernier caliper at room temperature before the battery device 100 is used.

[0134] It should be noted that h1, h2 and h3 do not include the dimensions of the pole 111 and / or the pressure relief structure, that is, h1, h2 and h3 can be obtained by measuring the dimensions of the outer shell of the battery cell 11.

[0135] In this embodiment, by setting the size of the battery cell 11 along the second direction to be in the range of 300 mm to 1200 mm, both the capacity and the assembly efficiency of the battery device 100 can be taken into consideration.

[0136] Exemplarily, the battery cell 11 in this embodiment may be a blade battery, which is long and thin in shape.

[0137] The size of the battery cell 11 along the height direction of the battery device 100 may be larger than the size of the battery cell 11 along the first direction, or the size of the battery cell 11 along the height direction of the battery device 100 may be smaller than the size of the battery cell 11 along the first direction.

[0138] It is understandable that while the battery cells 11 can be stacked in the first direction, they can also be stacked in the height direction. That is, the number of battery cells 11 can be increased in the first direction and the height direction to increase the capacity of the battery device 100.

[0139] In some embodiments, see Figures 7 and 8 The battery cell 11 further includes a pole 111 and / or a pressure relief structure, which is disposed on at least one side of the battery cell 11 along the second direction, and the first direction, the second direction and the height direction of the battery device 100 intersect.

[0140] It can be understood that the battery cells 11 of the battery layer 10 are arranged along the first direction, and the battery layers 10 are stacked along the height direction of the battery device 100. Therefore, it is not convenient to arrange the pole 111 and / or the pressure relief structure in the first direction and the height direction of the battery device 100. For example, by arranging the pole 111 and / or the pressure relief structure in the first direction or the height direction of the battery device 100, it is necessary to avoid the pole 111 and / or the pressure relief structure, which is not conducive to improving the compactness of the structure.

[0141] In this way, when the battery cells 11 are stacked along the first direction, the poles 111 are arranged on the sides of the battery cells 11, so as to facilitate the electrical connection of multiple battery cells 11 in series and / or in parallel. It should be noted that the poles 111 include positive poles 111 and negative poles 111. During the charge and discharge process of the battery, the positive poles 111 and the negative poles 111 are electrically connected to form a current loop, and the positive poles 111 and / or negative poles 111 of multiple battery cells 11 can also be electrically connected in series and / or in parallel.

[0142] In this embodiment, by arranging the pole 111 and / or the pressure relief structure on at least one side of the battery cell 11 along the second direction, on the one hand, it is helpful to improve the structural compactness of the battery device 100, and on the other hand, it is also helpful to reduce the damage to the pole 111 and / or the pressure relief structure during the stacking process of the battery cell 11 and / or the battery layer 10.

[0143] In some embodiments, see Figures 5 to 8 Along the second direction, the first flow channel group 316 is closer to the pole 111 and / or the pressure relief structure than the second flow channel group 317 .

[0144] Here, the medium flow channel 314 of the first flow channel group 316 is connected to the liquid inlet 318, and the medium flow channel 314 of the second flow channel group 317 is connected to the liquid outlet 319. In the process of heat exchange, the heat exchange medium first flows through the medium flow channel 314 of the first flow channel group 316, and then flows through the medium flow channel 314 of the second flow channel group 317. In this way, the temperature of the medium flow channel 314 in the first flow channel group 316 is relatively lower than the medium flow channel 314 in the second flow channel group 317. The temperature of the end of the battery cell 11 close to the pole 111 and / or the pressure relief structure is relatively higher than the temperature of the end far from the pole 111 and / or the pressure relief structure. In this way, by setting the first flow channel group 316 closer to the pole 111 and / or the pressure relief structure than the second flow channel group 317, it is beneficial to improve the heat exchange efficiency and the temperature uniformity of the battery cell 11.

[0145] In some embodiments, see Figures 7 and 8 Each battery layer 10 includes a plurality of battery cells 11 arranged along a first direction, a barrier 40 is provided on at least one side of the protrusion 313 along a second direction, and the first direction, the second direction and the height direction of the battery device 100 intersect.

[0146] The barrier member 40 may be disposed on one side of the protrusion 313 along the second direction, or the barrier members 40 may be disposed on both sides of the protrusion 313 along the second direction.

[0147] Of course, the barrier member 40 may also be disposed at a middle position of the protrusion 313 , for example, the barrier member 40 is disposed at a gap between adjacent medium flow channels 314 .

[0148] Exemplarily, the barrier 40 extends along the first direction.

[0149] In this embodiment, a barrier member 40 is provided on at least one side of the protrusion 313 along the second direction, which is beneficial to barrier the adhesive, thereby further improving the situation of adhesive overflow.

[0150] In some embodiments, see Figures 7 and 8, barrier members 40 are disposed on both sides of the protrusion 313 along the second direction, and the two barrier members 40 are respectively supported at both ends of the battery cell 11 along the second direction.

[0151] That is, the two baffles 40 are respectively located on the outer side of the protrusion 313 along the second direction, which is further conducive to improving the situation of adhesive overflow. In addition, by supporting the two baffles 40 at both ends of the battery cell 11 along the second direction, it is conducive to improving the supporting effect of the baffles 40 on the battery cell 11, and the possibility of the upper battery layer 10 crushing the medium flow channel 314 can be further reduced, thereby further improving the reliability of the battery device 100.

[0152] In some embodiments, see Figures 5 to 8 Each battery layer 10 includes a plurality of battery cells 11 arranged along a first direction, and the battery assembly also includes at least one end plate 50. The end plate 50 is provided at at least one end of the battery layer 10 along the first direction, and the heat exchange element 31 is connected to the end plate 50 at at least one end along the first direction. The first direction intersects with the height direction of the battery device 100.

[0153] The number of the end plate 50 may be one or more.

[0154] The battery layer 10 may be provided with an end plate 50 at one end along the first direction, and the other end may be against the side wall of the box assembly 20. The battery layer 10 may also be provided with end plates 50 at both ends along the first direction.

[0155] In the embodiment where end plates 50 are disposed at both ends of the battery layer 10 along the first direction, both ends of the heat exchange element 31 along the first direction are connected to the end plates 50 .

[0156] Here, the end plate 50 is used to constrain the battery layer 10 in the first direction and at least to withstand the expansion force of the battery cell 11. The expansion force here specifically refers to the force applied to the box assembly 20 due to the expansion deformation of the battery cell 11. As an example, the end plate 50 mainly withstands the expansion force along the first direction.

[0157] In some related arts, the end plate 50 is also referred to as an expansion beam.

[0158] The specific structure and material of the end plate 50 are not limited. As an example, the end plate 50 may be a beam-shaped structure. The end plate 50 may be made of any suitable material, such as metal materials, polymer materials, composite materials, etc.

[0159] The specific connection method between the heat exchange element 31 and the end plate 50 is not limited, and can be a fastening connection, a clamping connection or a welding connection, so as to transfer the force applied to the heat exchange element 31 to the end plate 50 .

[0160] For example, see Figure 3 The box assembly 20 includes a frame and a bottom wall. The frame is arranged along the edge of the bottom wall. The frame and the bottom wall together enclose a receiving space. The end plate 50 is connected to the frame. It can be understood that the heat exchange element 31 can transfer the force received to the end plate 50, and the end plate 50 can transfer the force received to the frame. In other words, the frame can provide support for the end plate 50, and the end plate 50 can provide support for the heat exchange element 31.

[0161] Exemplarily, both ends of the end plate 50 along the second direction are connected to the frame.

[0162] For example, the end plate 50 may be connected to the frame first and then the battery layer 10 may be assembled. Alternatively, the end plate 50 and the battery layer 10 may be assembled together first and then the pre-assembled parts of the end plate 50 and the battery layer 10 may be assembled to the frame.

[0163] In this embodiment, by providing an end plate 50 at at least one end of the battery layer 10 along the first direction, and connecting at least one end of the heat exchange element 31 along the first direction to the end plate 50, it is beneficial for the heat exchange element 31 to transfer the force it is subjected to to the frame through the end plate 50, which is beneficial to improving the supporting strength of the battery layer 10 and reducing the possibility of squeezing and damaging the battery layer 10 below due to excessive stacking, thereby increasing the capacity of the battery device 100 while improving the reliability of the battery device 100.

[0164] In some embodiments, see Figures 3 to 5 The multi-layer battery layer 10 includes a first battery layer 12 and a second battery layer 13, and the second battery layer 13 is located above the first battery layer 12. The end plate 50 includes a first end plate 51 and a second end plate 52 that are arranged opposite to each other along a first direction, the first battery layer 12 is arranged between the first end plate 51 and the second end plate 52, and the two ends of the heat exchange element 31 along the first direction are respectively connected to the first end plate 51 and the second end plate 52.

[0165] That is, the heat exchanger 31 disposed between the first battery layer 12 and the second battery layer 13 is connected to the first end plate 51 and the second end plate 52 corresponding to the first battery layer 12. In other words, the heat exchanger 31 is connected to the end plate 50 corresponding to the battery layer 10 located below.

[0166] In some embodiments, see Figures 3 to 5 The end plate 50 includes a third end plate 53 and a fourth end plate 54 arranged opposite to each other along the first direction, the second battery layer 13 is arranged between the third end plate 53 and the fourth end plate 54, and the two ends of the heat exchange element 31 along the first direction are respectively connected to the third end plate 53 and the fourth end plate 54.

[0167] That is, the heat exchanger 31 disposed between the first battery layer 12 and the second battery layer 13 is connected to the third end plate 53 and the fourth end plate 54 corresponding to the second battery layer 13. In other words, the heat exchanger 31 is connected to the end plate 50 corresponding to the battery layer 10 located above.

[0168] Here, the heat exchange element 31 , the third end plate 53 , the fourth end plate 54 and the second battery layer 13 form a whole, and then are stacked with other battery layers 10 , which is beneficial to improving the overall structural strength of the battery device 100 .

[0169] In some other embodiments, the heat exchange element 31 may be connected to the first end plate 51 , the second end plate 52 , the third end plate 53 and the fourth end plate 54 at the same time.

[0170] Of course, in some other embodiments, the battery layer 10 is used to support the heat exchange element 31 above.

[0171] That is to say, the weight of the heat exchange element 31 is supported on the battery layer 10 , that is, the battery layer 10 is used to support the heat exchange element 31 thereon.

[0172] In some embodiments, the battery assembly includes a mounting bracket, the mounting bracket is connected to the box assembly 20, and the heat exchange element 31 is connected to the mounting bracket.

[0173] Exemplarily, the mounting bracket is connected to the bottom wall of the box assembly 20 .

[0174] Illustratively, the mounting bracket is connected to the frame of the box assembly 20 .

[0175] In some embodiments, see Figure 7 A first flange portion 315 is formed at at least one end of the heat exchange element 31 along the first direction, and the first flange portion 315 is connected to the end plate 50 .

[0176] The heat exchanger 31 may have the first flange 315 formed at one end along the first direction, or may have the first flange 315 formed at both ends along the first direction. In other words, the heat exchanger 31 is folded toward the end plate 50 to form the first flange 315, and is connected to the end plate 50 through the first flange 315. The connection structure is simple, reliable, and easy to form.

[0177] In some embodiments, see Figure 3 to Figure 4 A heating element 32 is provided on the top of the uppermost battery layer 10 .

[0178] In this way, the top of the uppermost battery layer 10 is heated, further improving the reliability of the battery device 100 .

[0179] In some embodiments, see Figure 3 to Figure 4The thermal management component 30 also includes an upper cover 33 , which is disposed on the top of the uppermost battery layer 10 , and a heating element 32 is disposed between the upper cover 33 and the uppermost battery layer 10 .

[0180] That is, the heating element 32 may be first attached to the surface of the upper cover 33 to form a pre-assembled component of the heating element 32 and the upper cover 33, and then the pre-assembled component is matched with the uppermost battery layer 10, for example, fixed by gluing.

[0181] Of course, the heating element 32 may be firstly attached to the uppermost battery layer 10 to form a pre-assembled component of the heating element 32 and the uppermost battery layer 10 , and then the pre-assembled component and the upper cover 33 may be fixed by gluing.

[0182] In this embodiment, an upper cover 33 is provided, and a heating element 32 is provided between the upper cover 33 and the uppermost battery layer 10, so that the setting of the heating element 32 is facilitated, so that the heating element 32 can better fit with the heat exchange element 31, and the heating element 32 can be protected, thereby improving the reliability of the thermal management component 30.

[0183] In some embodiments, see Figure 3 to Figure 4 A second flange portion 331 is formed at at least one end of the upper cover 33 along the first direction, and the second flange portion 331 is connected to the end plate 50 .

[0184] The upper cover 33 may have the second flange portion 331 formed at one end along the first direction, or may have the second flange portion 331 formed at both ends along the first direction.

[0185] That is, the upper cover 33 is folded toward the end plate 50 to form the second flange portion 331 , and is connected to the end plate 50 via the second flange portion 331 . The connection structure is simple, reliable, and easy to form.

[0186] The specific connection method between the second flange portion 331 and the end plate 50 is not limited, and can be fastening connection, clamping or welding. The connection structure is simple and reliable.

[0187] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are contradictory.

[0188] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Box components; A battery assembly, the battery assembly comprising a plurality of battery layers stacked along a height direction of the battery device, the plurality of battery layers being arranged in the box assembly; A thermal management component, the thermal management component comprising a heat exchange element and a heating element, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the battery layer; The heat exchange element is arranged between multiple battery layers, and is used to support at least part of the battery layer; the heating element is arranged between the battery layer and the heat exchange element, or the heating element is arranged between the battery layer and the box assembly.

2. The battery device according to claim 1, characterized in that: The multiple battery layers include a first battery layer and a second battery layer disposed adjacent to each other, wherein the second battery layer is located above the first battery layer; A first matching plane is formed on a side of the heat exchange element facing the first battery layer, and the heating element is arranged between the first matching plane and the first battery layer.

3. The battery device according to claim 2, characterized in that: The heating element is attached to the first matching plane.

4. The battery device according to claim 2, characterized in that: The heat exchange element includes at least two heat exchange plates, and the heat exchange plates include a first heat exchange plate and a second heat exchange plate. A partial area of ​​the first heat exchange plate protrudes to form a protrusion. The first heat exchange plate and the second heat exchange plate are stacked. The medium flow channel is defined between the protrusion and the second heat exchange plate. The side of the second heat exchange plate facing away from the first heat exchange plate forms the first matching plane.

5. The battery device according to any one of claims 1 to 4, characterized in that: Each of the battery layers includes a plurality of battery cells arranged along a first direction, and the battery assembly also includes at least one end plate. The end plate is provided at at least one end of the battery layer along the first direction, and the heat exchange element is connected to the end plate at at least one end along the first direction, and the first direction intersects with the height direction of the battery device.

6. The battery device according to claim 5, characterized in that: A first flange portion is formed at at least one end of the heat exchange member along the first direction, and the first flange portion is connected to the end plate.

7. The battery device according to claim 5, characterized in that: The heat exchange element is fastened, clamped or welded to the end plate.

8. The battery device according to any one of claims 1 to 4, characterized in that: The heating element is arranged on the top of the uppermost battery layer.

9. The battery device according to claim 8, characterized in that: The thermal management component further includes an upper cover, which is disposed on the top of the uppermost battery layer, and the heating element is disposed between the upper cover and the uppermost battery layer.

10. The battery device according to claim 9, characterized in that: Each of the battery layers includes a plurality of battery cells arranged along a first direction, and the battery assembly further includes at least one end plate, and the end plate is disposed at at least one end of the battery layer along the first direction; A second flange portion is formed at at least one end of the upper cover along the first direction, and the second flange portion is connected to the end plate.

11. The battery device according to claim 10, characterized in that: The second flange portion is fastened, clamped or welded to the end plate.

12. The battery device according to any one of claims 1 to 4, characterized in that: Each of the battery layers includes a plurality of battery cells arranged along a first direction, the dimensions of the battery cells along a height direction of the battery device and the dimensions of the battery cells along the first direction are smaller than the dimensions of the battery cells along a second direction, the first direction, the second direction and the height direction of the battery device intersect, and the dimensions of the battery cells along the second direction are in the range of 300 mm to 1200 mm.

13. The battery device according to any one of claims 1 to 4, characterized in that: Each of the battery layers includes a plurality of battery cells arranged along a first direction, and the battery cells also include poles and / or pressure relief structures, and the poles and / or pressure relief structures are arranged on at least one side of the battery cells along a second direction, and the first direction, the second direction and the height direction of the battery device intersect.

14. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 13.

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