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, each battery layer comprises a plurality of battery monomers which are arranged along the first direction, and the plurality of battery layers are arranged in the accommodating space. The heat management assembly comprises at least one heat exchange piece, and the heat exchange piece is arranged between the multiple battery layers, or the heat exchange piece is arranged between the battery layers and the box body assembly. At least one medium runner is arranged in the heat exchange piece, is in a linear shape and penetrates through the two ends, in the first direction, of the at least one heat exchange piece. And a first matching plane and a second matching plane are respectively arranged on two opposite sides of the heat exchange piece along the height direction of the battery device. The size of the battery cells in the height direction of the battery device and the size of the battery cells in the first direction are smaller than the size of the battery cells in the second direction, and the size of the battery cells in the second direction ranges from 300 mm to 1200 mm.

Description

Technical Field

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

[0002] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. In related technologies, a single-layer battery layer arrangement is adopted. However, a single-layer battery device may have problems such as low energy density and limited power. In addition, during the use of the battery device, the battery cells inside the battery device will generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to improve the energy density of the battery device while improving the heat exchange efficiency of the battery cells of the battery device for heat dissipation has become an important research direction in this field. Summary of the Invention

[0003] In view of this, embodiments of the present application are expected to provide a battery device and an electrical device that can improve the energy density of the battery device while also improving the heat exchange efficiency.

[0004] To this end, a first aspect of the embodiments of the present application provides a battery device, including: A box body assembly, the interior of the box body assembly having an accommodation space; A battery assembly, the battery assembly including multiple battery layers stacked along the height direction of the battery device, each battery layer including multiple battery cells arranged along a first direction, and the multiple battery layers being arranged in the accommodation space, the first direction intersecting the height direction of the battery device; A thermal management assembly, the thermal management assembly including at least one heat exchange member, the heat exchange member being arranged between the multiple battery layers, or the heat exchange member being arranged between the battery layer and the box body assembly; at least one medium flow channel is provided inside the at least one heat exchange member, the at least one medium flow channel being linear and penetrating through both ends of the at least one heat exchange member along the first direction, and the at least one medium flow channel being used for conducting a heat exchange medium, the heat exchange medium being used for exchanging heat with the battery layer; Wherein, a first mating plane and a second mating plane are respectively arranged on opposite sides of the heat exchange member along the height direction of the battery device; The size of the battery cell along the height direction of the battery device and the size of the battery cell along the first direction are smaller than the size of the battery cell along a second direction, the first direction, the second direction and the height direction of the battery device intersect, and the size of the battery cell along the second direction is in the range of 300 mm to 1200 mm.

[0005] The battery device provided by the embodiment of the present application includes a box body assembly, a thermal management assembly, and a battery assembly. The battery layer is arranged inside the box body assembly, and the box body assembly plays a protective role for the battery layer. On the one hand, by arranging multiple battery layers, it is beneficial to improve the power of the battery device. In addition, stacking the battery layers along the height direction of the battery device is also beneficial to make full use of the space inside the box body assembly and improve the energy density of the battery device. On the other hand, by arranging the heat exchange member between multiple battery layers, heat exchange can be simultaneously performed on the battery layers located on opposite sides of the heat exchange member, which is beneficial to improving the heat exchange efficiency of the thermal management assembly for 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 respectively arranging a first mating plane and a second mating plane on opposite sides of the heat exchange member along the height direction of the battery device, the contact area between the heat exchange member and the battery cell can be increased to increase the heat exchange area between the heat exchange member and the battery cell, thereby further improving the heat exchange efficiency of the thermal management assembly. In addition, by setting the medium flow channel to be linear and passing through both ends of at least one heat exchange member along the first direction, it is convenient for the forming of the heat exchange member.

[0006] In addition, by setting the size of the battery cell along the second direction to be in the range of 300 mm to 1200 mm, the capacitance and assembly efficiency of the battery device can be taken into account.

[0007] In some embodiments, the battery assembly further includes at least one end plate. The end plate is arranged at at least one end of the battery layer along the first direction, and the battery cells of the battery layer abut against the end plate.

[0008] In this embodiment, by respectively having end plates at at least one end of the battery layer along the first direction, the end plates are used to constrain the battery layer in the first direction and at least bear the expansion force of the battery cells. In this way, it is beneficial to improve the reliability of the battery device.

[0009] In some embodiments, the end plate includes a main body portion and a current collecting portion. The battery cells of the battery layer abut against the main body portion, and both ends of the heat exchange member along the first direction are hermetically connected to the current collecting portion.

[0010] In this embodiment, by setting the end plate to include a main body portion and a current collecting portion, that is, by integrating the current collecting portion on the end plate, on the one hand, it is beneficial to reduce the number of components, thereby improving the assembly efficiency and reducing the cost. On the other hand, it is convenient to make full use of the space inside the box body assembly, facilitate the assembly of the end plate and the thermal management assembly, improve the structural compactness of the battery device, and further improve the energy density of the battery device.

[0011] In some embodiments, at least a portion of the flow collecting portion is provided with a flow collecting space and a liquid outlet communicating with the flow collecting space, and the flow collecting space is communicated with at least a portion of the medium flow channel.

[0012] In this embodiment, by providing at least part of the collecting portion with a collecting space and a liquid port connected to the collecting space, on the one hand, it is convenient to cooperate with the medium flow channel of the heat exchange component so that the heat exchange medium can circulate in the medium flow channel. On the other hand, it is also beneficial to the convergence and diversion of the heat exchange medium and to connect it with the pipeline of the air-conditioning system of the electrical device or the liquid storage device such as the water tank.

[0013] In some embodiments, at least a portion of the collecting portion is formed with a connecting channel, one end of the connecting channel is connected to the collecting space, and the other end of the connecting channel passes through the side wall of the collecting portion along the first direction away from the heat exchange element to form the liquid outlet.

[0014] In this embodiment, a connecting channel is formed inside the collecting part, and one end of the connecting channel passes through the side wall of the collecting part away from the heat exchange element along the first direction to form a liquid port. In this way, the circulation of the heat exchange medium is facilitated, and the structural compactness of the battery device is further improved.

[0015] In some embodiments, the bottom of the current collecting portion is recessed to form the current collecting space.

[0016] Here, the current collecting space is formed by recessing the bottom of the current collecting portion, and the structure is simple and easy to form.

[0017] In some embodiments, at least one end of the heat exchange element along the first direction extends toward the bottom of the collecting portion to form a sealing portion, and the sealing portion is sealed and matched with the edge of the collecting space.

[0018] In this embodiment, a sealing portion is provided on the heat exchange component so that the sealing portion is sealed with the edge of the collecting space, and a closed collecting cavity is defined by the heat exchange component and the collecting portion, which facilitates molding and reduces manufacturing difficulty.

[0019] In some embodiments, the edge of the current collecting space is recessed to form a step, and the sealing portion is in sealing cooperation with the step.

[0020] In this embodiment, a step is formed by recessing the edge of the collecting space, and the step is sealed with the sealing part. On the one hand, the step can position the sealing part, thereby improving the assembly efficiency. On the other hand, the setting of the step is more conducive to improving the sealing performance between the sealing part and the collecting part.

[0021] In some embodiments, the main body and the current collecting portion are an integrated structure.

[0022] Thus, it is beneficial to reduce the number of components, improve the assembly efficiency, and enhance the structural strength between the main body and the manifold.

[0023] In some embodiments, the heat exchanger is at least fixedly connected, snap-connected or welded to the end plate.

[0024] In some embodiments, the heat exchanger is provided as an integrally formed structure by extrusion molding.

[0025] This molding method is simple.

[0026] In some embodiments, the heat exchanger is integrally formed with at least a part of the box assembly.

[0027] In some embodiments, the box assembly includes a first box and a second box connected to each other. The first box is disposed above the second box and encloses at least a part of the accommodation space; The at least one heat exchanger includes a first heat exchanger, and the first box and the first heat exchanger are an integrally formed structure by extrusion molding; and / or, The at least one heat exchanger includes a second heat exchanger, and the second box and the second heat exchanger are an integrally formed structure by extrusion molding.

[0028] Thus, it is beneficial to reduce the number of components and improve the assembly efficiency.

[0029] In some embodiments, a connecting portion is provided on at least one side of the heat exchanger along a second direction, and the connecting portion is at least connected to the box assembly. The first direction, the second direction and the height direction of the battery device intersect.

[0030] In this embodiment, by providing a connecting portion on at least one side of the heat exchanger along the second direction and connecting the connecting portion to the box assembly, it is beneficial to improve the connection reliability of the heat exchanger.

[0031] In some embodiments, the heat exchanger is fixedly connected, snap-connected or welded to the box assembly.

[0032] In some embodiments, a flanging is provided on at least one side of the heat exchanger along the second direction, and at least a part of the battery cells abuts against the flanging.

[0033] In this embodiment, by providing the flanging, it is beneficial to block the adhesive, thereby further improving the situation of adhesive overflow. In addition, the flanging can also be used to restrain the battery layer in the second direction and at least bear the expansion force of the battery cells.

[0034] In some embodiments, the battery cell further includes a terminal and / or a pressure relief structure, and the terminal and / or the pressure relief structure is disposed on at least one side of the battery cell along the second direction, and the first direction, the second direction and the height direction of the battery device intersect.

[0035] On the one hand, it is beneficial to improve the structural compactness of the battery device. On the other hand, it is also beneficial to reduce the damage to the terminal and / or the pressure relief structure during the stacking of the battery cells and / or battery layers.

[0036] In some embodiments, the accommodation space is divided into at least two accommodation areas in a first plane, the battery assembly includes at least two battery groups, at least one of the battery groups is placed in each accommodation area, and each battery group includes multiple battery layers stacked in the height direction of the battery device.

[0037] Here, by dividing the accommodation space into at least two accommodation areas in the first plane, setting the battery assembly to include at least two battery groups, and each battery group including multiple battery layers stacked in the height direction of the battery device, and placing at least one battery group in each accommodation area. Thus, on the one hand, it is beneficial to increase the power of the battery device. On the other hand, it is also beneficial to make full use of the space in the box assembly and improve the energy density of the battery device.

[0038] The second aspect of the embodiments of the present application provides an electrical device, including the battery device described above.

[0039] The battery device of the electrical device provided by the embodiments of the present application includes a box assembly, a thermal management assembly and a battery assembly. The battery layers are disposed in the box assembly, and the box assembly plays a protective role for the battery layers. On the one hand, by providing 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 make full use of the space in the box assembly and improve the energy density of the battery device. On the other hand, by disposing the heat exchange member between multiple battery layers, heat exchange can be simultaneously performed on the battery layers located on opposite sides of the heat exchange member, which is beneficial to improving the heat exchange efficiency of the thermal management assembly for the battery layers. That is to say, while improving the energy density of the battery device, the heat exchange efficiency can also be improved. In addition, by respectively providing a first mating plane and a second mating plane on opposite sides of the heat exchange member along the height direction of the battery device, the contact area between the heat exchange member and the battery cell can be increased to increase the heat exchange area between the heat exchange member and the battery cell, thereby further improving the heat exchange efficiency of the thermal management assembly. In addition, by setting the medium flow channel to be linear and passing through both ends of at least one heat exchange member along the first direction, it is convenient for the forming of the heat exchange member. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1Schematic structural diagram of a vehicle provided by some embodiments of the present disclosure; Figure 2 Exploded perspective view of a battery device provided by some embodiments of the present disclosure; Figure 3 Partial exploded perspective view of a battery device provided by the first embodiment of the present disclosure; Figure 4 Partial exploded perspective view of a battery device provided by the second embodiment of the present disclosure; Figure 5 Schematic connection structure diagram of an end plate and a heat exchange member provided by the first embodiment of the present disclosure; Figure 6 Schematic connection structure diagram of an end plate and a heat exchange member provided by the second embodiment of the present disclosure; Figure 7 is Figure 6 Cross-sectional view in the A-A direction in Figure 8 Schematic connection structure diagram of an end plate and a heat exchange member provided by the third embodiment of the present disclosure; Figure 9 is Figure 8 Cross-sectional view in the B-B direction in Figure 10 Schematic connection structure diagram of an end plate and a heat exchange member provided by the fourth embodiment of the present disclosure; Figure 11 Schematic structure diagram of an end plate provided by the first embodiment of the present disclosure; Figure 12 Schematic structure diagram of an end plate provided by the second embodiment of the present disclosure; Figure 13 Cross-sectional view of a box assembly provided by some embodiments of the present disclosure.

[0041] Explanation of reference numerals 10. Battery pack; 11. Battery cell; 20. Box assembly; 21. First box; 22. Second box; 23. Upper cover; 30. Thermal management assembly; 31. Heat exchange member; 311. Medium flow channel; 312. Sealing portion; 313. Connection portion; 314. Flange; 315. First mating plane; 316. Second mating plane; 32. Connecting member; 40. End plate; 41. Main body portion; 42. Current collecting portion; 421. Current collecting space; 422. Liquid passing port; 423. Connection channel; 424. Step; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed description of the embodiments

[0042] If there is no special instruction, all embodiments and optional embodiments of the present disclosure can be combined with each other to form a new technical solution.

[0043] 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.

[0044] With the development of clean energy, more and more devices use electric energy as the driving energy. As a result, power batteries that can store a large amount of electric energy and can be repeatedly charged and discharged have developed rapidly, such as lithium-ion batteries. Among them, power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace.

[0045] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0046] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure do not limit this.

[0047] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0048] The electrode assembly can be a wound structure, a laminated structure, or a hybrid structure of winding and laminating.

[0049] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0050] In some embodiments, the electrode assembly is a laminated structure.

[0051] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0052] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0053] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple folded segments arranged in a stacked manner.

[0054] As an example, multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0055] As an example, the separator can be continuously provided and disposed between any adjacent positive electrode sheets or negative electrode sheets in a folded or wound manner.

[0056] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, or the like.

[0057] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0058] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0059] 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present disclosure has no particular limitation.

[0060] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0061] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal can be provided on the end cap or on the housing body.

[0062] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0063] In the related art, a single-layer battery layer arrangement method is adopted, but a single-layer battery device may have problems such as low energy density and limited power. In addition, during the use of the battery device, the battery cells in the battery device generate heat, and if these heats are too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to improve the energy density of the battery device while enhancing the effective heat exchange efficiency and heat dissipation of the battery cells of the battery device has become an important research direction in this field.

[0064] In view of this, in order to improve the energy density of the battery device while enhancing the heat exchange efficiency, an embodiment of the present disclosure provides a battery device, which includes a box body assembly, a thermal management assembly, and a battery assembly. The interior of the box body assembly has an accommodation space. The battery assembly includes multiple battery layers stacked along the height direction of the battery device. Each battery layer includes multiple battery cells arranged in a first direction. The multiple battery layers are disposed in the accommodation space, and the first direction intersects with the height direction of the battery device. The thermal management assembly includes at least one heat exchange member. The heat exchange member is disposed between the multiple battery layers, or the heat exchange member is disposed between the battery layer and the box body assembly. At least one heat exchange member has at least one medium flow channel inside. The at least one medium flow channel is linear and penetrates both ends of the at least one heat exchange member along the first direction. The at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery layer. Wherein, a first mating plane and a second mating plane are respectively disposed on opposite sides of the heat exchange member along the height direction of the battery device. 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.

[0065] The battery device provided by the embodiment of the present application includes a box body assembly, a thermal management assembly, and a battery assembly. The battery layer is disposed inside the box body assembly, and the box body assembly plays a protective role for the battery layer. On the one hand, by providing 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 make full use of the space inside the box body assembly and improve the energy density of the battery device. On the other hand, by disposing the heat exchange member between the multiple battery layers, heat exchange can be simultaneously performed on the battery layers located on opposite sides of the heat exchange member, which is beneficial to improving the heat exchange efficiency of the thermal management assembly for the battery layer. That is to say, while improving the energy density of the battery device, the heat exchange efficiency can also be enhanced. In addition, by respectively disposing a first mating plane and a second mating plane on opposite sides of the heat exchange member along the height direction of the battery device, the contact area between the heat exchange member and the battery cell can be increased, so as to increase the heat exchange area between the heat exchange member and the battery cell, thereby further enhancing the heat exchange efficiency of the thermal management assembly. In addition, by setting the medium flow channel to be linear and penetrating both ends of the at least one heat exchange member along the first direction, in this way, it is convenient for the molding of the heat exchange member. In addition, by setting the dimension of the battery cell along the second direction to be in the range of 300 mm to 1200 mm, the capacitance and assembly efficiency of the battery device can be taken into account.

[0066] The technical solution described in the embodiment of the present disclosure is applicable to an electrical device using the battery device. The electrical device includes the battery device of any embodiment of the present disclosure, and the battery device is used to provide electrical energy.

[0067] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present disclosure do not impose special restrictions on the above-mentioned electrical devices.

[0068] It should be noted that the technical solutions described in the embodiments of the present disclosure are not only applicable to the battery devices described above, but also applicable to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0069] Please refer to Figure 1 , inside the vehicle 1000, a controller 200, a motor 300 and a battery device 100 can be arranged. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and be used 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 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0070] Please refer to Figures 2 to 4, embodiments of the present disclosure provide a battery device 100, which includes a box body assembly 20, a thermal management assembly 30, and a battery pack 10. The interior of the box body assembly 20 has an accommodation space. The battery pack 10 includes multiple battery layers stacked along the height direction of the battery device 100. Each battery layer includes a plurality of battery cells 11 arranged in a first direction. The multiple battery layers are disposed in the accommodation space, and the first direction intersects with the height direction of the battery device 100. The thermal management assembly 30 includes at least one heat exchange member 31. The heat exchange member 31 is disposed between the multiple battery layers, or the heat exchange member 31 is disposed between the battery layer and the box body assembly 20. At least one heat exchange member 31 has at least one medium flow channel 311 inside. The at least one medium flow channel 311 is linear and penetrates both ends of the at least one heat exchange member 31 along the first direction. The at least one medium flow channel 311 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery layer. Wherein, a first mating plane 315 and a second mating plane 316 are respectively disposed on opposite sides of the heat exchange member 31 along the height direction of the battery device 100.

[0071] In the embodiments of the present application, the term "multiple layers" refers to two or more layers.

[0072] To meet different power usage requirements, the battery pack 10 of the battery device 100 includes multiple battery layers stacked in the height direction. Each battery layer includes a plurality of battery cells 11. A battery cell 11 refers to the smallest unit that makes up a battery module or a battery pack. The multiple battery cells 11 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 11. The multiple battery cells 11 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 11 is accommodated in the box body assembly 20. Of course, the battery device 100 can also be in the form that multiple battery cells 11 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body assembly 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection among the multiple battery cells 11. Wherein, 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 is not limited thereto. The battery cell 11 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0073] The box body assembly 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box body assembly 20 can be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0074] The housing assembly 20 is used to encapsulate the battery cell 11, and the housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11.

[0075] Exemplarily, the housing assembly 20 is generally a cuboid structure. The length direction and the width direction of the housing assembly 20 are both parallel to the horizontal plane, and the length direction of the housing assembly 20 is parallel to the longest side of the cuboid structure of the housing assembly 20. The height direction of the housing assembly 20 is perpendicular to the ground.

[0076] Exemplarily, please refer to Figure 2 , the first direction is represented by X, the second direction is represented by Y, and the height direction of the battery device 100 is represented by Z.

[0077] It should be noted that the specific type of the heat exchange medium is not limited herein, as long as it can achieve a heat exchange effect on the battery cell 11. For example, it can be gaseous or liquid. In the embodiments of the present disclosure, the heat exchange medium is taken as a coolant for description.

[0078] It should be noted that the specific number of the medium flow channels 311 is not limited herein. It can be one or multiple.

[0079] Exemplarily, please refer to Figures 2 to 5 , the heat management assembly 30 further includes an inlet and an outlet, and both the inlet and the outlet are communicated with the medium flow channel 311.

[0080] Here, the inlet and the outlet of the heat management assembly 30 are used to connect to the pipelines of a liquid storage device such as an air conditioning system or a water tank of a whole vehicle or an electrical device.

[0081] The principle of the heat management assembly 30 for exchanging heat with the battery cell 11 is as follows: The heat exchange medium output from a heat exchange medium source (not shown in the figure) enters the medium flow channel 311 through the inlet of the heat management assembly 30. After the heat exchange medium exchanges heat with the battery cell 11, the heat exchange medium flows out through the outlet of the heat management assembly 30, completing the heat exchange with the battery cell 11.

[0082] Here, the heat management assembly 30 can dissipate heat from the battery cell 11 or heat the battery cell 11.

[0083] The principle of the heat management assembly 30 for dissipating heat from the battery cell 11 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 311 through the inlet of the heat management assembly 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 11, the heat exchange medium flows out through the outlet of the heat management assembly 30, releasing the heat and completing the cooling and heat dissipation of the battery cell 11.

[0084] The principle of the thermal management component 30 heating the battery cell 11 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 311 of the thermal management component 30 through the liquid inlet. After the heat exchange medium transfers heat to the battery cell 11 to heat the battery cell 11, the heat exchange medium flows out through the liquid outlet of the thermal management component 30, completing the heating of the battery cell 11.

[0085] The housing component 20 is used to accommodate the battery cell 11, and the housing component 20 can have various structures. In some embodiments, referring to Figure 2 and Figure 3 , the housing component 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are covered with each other to define an accommodation space for accommodating the battery cell 11.

[0086] To improve the sealing performance after the connection between the first housing 21 and the second housing 22, a sealing member, such as sealant, sealing ring, etc., can also be provided between the first housing 21 and the second housing 22.

[0087] Assuming that the first housing 21 covers the top of the second housing 22, the first housing 21 can also be referred to as the upper cover, and the second housing 22 can also be referred to as the lower cover.

[0088] Here, the specific material of the heat exchange member 31 is not limited herein.

[0089] In some embodiments, the heat exchange member 31 is provided as a metal plate. Exemplarily, the material of the heat exchange member 31 can be, for example, aluminum alloy, aluminum, etc.

[0090] The materials of different heat exchange members 31 can be the same or different.

[0091] Here, by setting the heat exchange member 31 as a metal plate, the metal plate not only has good structural strength but also has good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange member 31, the heat exchange plate can also have a certain structural strength.

[0092] Exemplarily, the battery device 100 further includes an adhesive layer. At least one side of the battery cell 11 in the height direction is bonded to the heat exchange member 31 through the adhesive layer, which is beneficial to improving the connection stability of the heat exchange member 31.

[0093] Exemplarily, both sides of the heat exchange member 31 in the height direction are bonded to the battery cell 11 through the adhesive layer.

[0094] Exemplarily, the dimension of the heat exchange member 31 in the height direction is in the range of 5 mm to 10 mm.

[0095] In a relatively cold environment, the temperature of the battery device 100 may be relatively low, which also affects the performance of the battery device 100. In related technologies, by setting a heating device to heat the heat exchange medium, the battery cell 11 is heated. However, this method has problems of complex structure and high cost.

[0096] In some embodiments, the thermal management component 30 further includes a heating element, and a heating element is disposed between the heat exchange member 31 and the battery layer.

[0097] Exemplarily, the heating element may be a heating film. Further, the heating element may be an electric heating film.

[0098] Exemplarily, the heating element has a heating resistor inside. After the heating resistor is powered on, heat is generated to heat the battery layer.

[0099] When the battery layer needs to be heated, part of the heat generated by the heating element can be directly transferred to the battery layer, and the other part can be transferred to the battery layer through the heat exchange member 31. The material of the heat exchange member 31 itself can transfer the heat generated by the heating element to the battery layer well. In this way, the heating element can heat two adjacent battery layers simultaneously, improving the heating efficiency.

[0100] When the battery layer needs to be cooled, the cold generated by the heat exchange member 31 can be transferred to the battery layer through the heating element (at this time, the heating element does not generate heat) to achieve heat dissipation of the battery layer.

[0101] Exemplarily, the heating element can be first attached to the surface of the heat exchange member 31, and then the heat exchange member 31 and the heating element are combined with the battery layer, for example, fixed by gluing. Of course, it can also be that the heating element is first attached to the battery layer, and then the heat exchange member 31, the heating element and the battery layer are fixed by gluing.

[0102] By disposing a heating element between the heat exchange member 31 and the battery layer, heating of the battery layers on opposite sides of the heat exchange member 31 can be achieved simultaneously. This structure is simple, has a low cost, and is beneficial to improving the heating efficiency.

[0103] By providing a first mating plane 315 and a second mating plane 316 on opposite sides of the heat exchange member 31 along the height direction of the battery device 100, that is to say, the heat exchange member 31 can cooperate with the battery layer and / or the box body through the first mating plane 315 and the second mating plane 316. In this way, the contact area between the heat exchange member 31 and the battery cell 11 can be increased to increase the heat exchange area between the heat exchange member 31 and the battery cell 11.

[0104] Exemplarily, the heat exchange member 31 is provided as an integrally formed structure by extrusion molding.

[0105] In this way, it is convenient to set the medium flow channel 311 to be linear and penetrate through both ends of at least one heat exchange member 31 in the first direction, and this forming method is simple.

[0106] There are various ways for the heat exchange member 31 to form the medium flow channel 311. Exemplarily, the interior of the heat exchange member 31 has a plurality of spaced-apart spacer ribs, and the medium flow channel 311 is defined between adjacent spacer ribs.

[0107] Exemplarily, some of the spacer ribs are flush with the end of the heat exchange member 31 in the first direction, and some of the spacers have a certain gap with the end of the heat exchange member 31 in the first direction.

[0108] The battery device 100 provided by the embodiment of the present application includes a box body assembly 20, a thermal management assembly 30, and a battery pack 10. The battery layers are arranged in the box body assembly 20, and the box body assembly 20 plays a protective role for the battery layers. On the one hand, by arranging multiple battery layers, it is beneficial to improve the power of the battery device 100. In addition, by stacking the battery layers along the height direction of the battery device 100, it is also beneficial to make full use of the space inside the box body assembly 20 and improve the energy density of the battery device 100; on the other hand, by arranging the heat exchange member 31 between multiple battery layers, heat exchange can be simultaneously performed on the battery layers located on opposite sides of the heat exchange member 31, which is beneficial to improving the heat exchange efficiency of the thermal management assembly 30 for the battery layers. 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 respectively providing a first mating plane 315 and a second mating plane 316 on opposite sides of the heat exchange member 31 along the height direction of the battery device 100, the contact area between the heat exchange member 31 and the battery cell 11 can be increased, so as to increase the heat exchange area between the heat exchange member 31 and the battery cell 11, thereby further improving the heat exchange efficiency of the thermal management assembly 30. In addition, by setting the medium flow channel 311 to be linear and penetrate through both ends of at least one heat exchange member 31 in the first direction, in this way, it is convenient for the forming of the heat exchange member 31.

[0109] In some embodiments, please refer to Figures 5 to 12 , the battery pack 10 further includes at least one end plate 40. The end plate 40 is arranged at at least one end of the battery layer in the first direction, and the battery cells 11 of the battery layer abut against the end plate 40.

[0110] The number of end plates 40 can be one or multiple.

[0111] The battery layer can be provided with an end plate 40 at one end in the first direction, and the other end can abut against the side wall of the box body assembly 20. The battery layer can also be provided with end plates 40 at both ends in the first direction.

[0112] The battery cell 11 of the battery layer abuts against the end plate 40, and the end plate 40 is used to constrain the battery layer in the first direction and at least used to withstand the expansion force of the battery cell 11. The expansion force here specifically refers to the acting force exerted on the box body assembly 20 due to the expansion and deformation of the battery cell 11. As an example, the end plate 40 mainly withstands the expansion force in the first direction.

[0113] In some related technologies, the end plate 40 is also called an expansion beam.

[0114] The specific structure and material of the end plate 40 are not limited. As an example, the end plate 40 can be a beam-like structure, and the end plate 40 can be made of any suitable material, such as metal materials, polymer materials, composite materials, etc.

[0115] Exemplarily, please refer to Figure 3 , the box body assembly 20 includes a frame and a bottom wall. The frame is arranged along the edge of the bottom wall, and the frame and the bottom wall jointly enclose a receiving space, and the end plate 40 is connected to the frame. It can be understood that the end plate 40 can transfer the force received to the frame, that is to say, the frame can provide support for the end plate 40.

[0116] Exemplarily, both ends of the end plate 40 in the second direction are connected to the frame.

[0117] Exemplarily, it can be to first connect the end plate 40 to the frame and then assemble the battery layer, or it can be to first assemble the end plate 40 with the battery layer and then assemble the pre-assembled part of the end plate 40 and the battery layer to the frame.

[0118] Of course, the end plate 40 can also be connected to the bottom wall of the box body assembly 20.

[0119] In this embodiment, by having end plates 40 at at least one end of the battery layer in the first direction, the end plates 40 are used to constrain the battery layer in the first direction and at least used to withstand the expansion force of the battery cell 11. In this way, it is beneficial to improve the reliability of the battery device 100.

[0120] In some embodiments, please refer to Figures 11 to 12 , the end plate 40 includes a main body portion 41 and a current collecting portion 42. The battery cell 11 of the battery layer abuts against the main body portion 41. Please refer to Figures 3 to 5 , both ends of the heat exchanger 31 in the first direction are hermetically connected to the current collecting portion 42.

[0121] Exemplarily, the current collecting portion 42 is equivalent to the current collector in related technologies.

[0122] Exemplarily, the main body portion 41 is arranged above the current collecting portion 42.

[0123] The main body portion 41 is used to cooperate with the battery layer, that is, the main body portion 41 is used to restrain the battery layer in the first direction and at least bear the expansion force of the battery cell 11.

[0124] Here, end plates 40 are provided at both ends of the heat exchange member 31 in the first direction, so that both ends of the heat exchange member 31 in the first direction are hermetically connected to the current collecting portion 42.

[0125] The current collecting portion 42 is disposed at the end of the heat exchange member 31 in the first direction and is used to cooperate with the medium flow channel 311 of the heat exchange member 31, so that the heat exchange medium can circulate in the medium flow channel 311.

[0126] In this embodiment, by setting the end plate 40 to include the main body portion 41 and the current collecting portion 42, that is, by integrating the current collecting portion 42 on the end plate 40, on the one hand, it is beneficial to reduce the number of components, thereby improving the assembly efficiency and reducing the cost. On the other hand, it is convenient to make full use of the space in the box assembly 20, facilitate the assembly of the end plate 40 and the thermal management assembly 30, improve the structural compactness of the battery device 100, and further improve the energy density of the battery device 100.

[0127] In some embodiments, please refer to Figures 6 to 7 and Figure 11 , at least part of the current collecting portion 42 is provided with a current collecting space 421 and a liquid passing port 422 communicating with the current collecting space 421, and the current collecting space 421 communicates with at least part of the medium flow channel 311.

[0128] Here, it may be that part of the current collecting portion 42 is provided with a current collecting space 421 and a liquid passing port 422 communicating with the current collecting space 421, or it may be that all of the current collecting portion 42 is provided with a current collecting space 421 and a liquid passing port 422 communicating with the current collecting space 421.

[0129] Exemplarily, it may be that the current collecting portion 42 provided at one end of the heat exchange member 31 in the first direction is provided with a current collecting space 421 and a liquid passing port 422 communicating with the current collecting space 421, and the current collecting portion 42 provided at the other end of the heat exchange member 31 in the first direction is not provided with a current collecting space 421 and a liquid passing port 422.

[0130] Exemplarily, the liquid passing port 422 may be a liquid inlet or a liquid outlet.

[0131] Exemplarily, the thermal management assembly 30 further includes a connecting member 32, the connecting member 32 is connected to the liquid passing port 422, and can be connected to the pipeline of a liquid storage device such as an air conditioning system or a water tank of an electrical device through the connecting member 32.

[0132] In this embodiment, by providing at least a portion of the collecting portion 42 with a collecting space 421 and a liquid port 422 connected to the collecting space 421, on the one hand, it is convenient to cooperate with the medium flow channel 311 of the heat exchange element 31 so that the heat exchange medium can circulate in the medium flow channel 311. On the other hand, it is also beneficial to the convergence and diversion of the heat exchange medium and to connect it with the pipeline of the air-conditioning system of the electrical device or a liquid storage device such as a water tank.

[0133] In some embodiments, see Figures 5 to 7 At least part of the collecting part 42 is formed with a connecting channel 423, one end of the connecting channel 423 is connected to the collecting space 421, and the other end of the connecting channel 423 passes through the side wall of the collecting part 42 away from the heat exchange element 31 along the first direction to form a liquid port 422.

[0134] That is to say, the flow collecting portion 42 provided with the flow collecting space 421 is correspondingly provided with the connecting channel 423 and the liquid passing port 422 .

[0135] That is, the liquid passage port 422 is in communication with the flow collecting space 421 through the connecting channel 423 .

[0136] Exemplarily, the connection channel 423 extends along the first direction, so that the connection channel 423 passes through both sides of the header 42 along the first direction.

[0137] In this embodiment, a connecting channel 423 is formed inside the collecting section 42, and one end of the connecting channel 423 passes through the side wall of the collecting section 42 away from the heat exchange element 31 along the first direction to form a liquid port 422. In this way, the circulation of the heat exchange medium is facilitated, and the structural compactness of the battery device 100 is further improved.

[0138] In some embodiments, see Figure 12 The bottom of the current collecting portion 42 is recessed to form a current collecting space 421 .

[0139] That is, the surface of the current collecting portion 42 which is away from the main body portion 41 is sunken to form a groove, and the groove constitutes the current collecting space 421 .

[0140] Exemplarily, the collecting space 421 extends to an edge of the collecting portion 42 close to the heat exchange element 31 , so as to achieve communication between the collecting space 421 and the medium flow channel 311 .

[0141] Here, the current collecting space 421 is formed by recessing the bottom of the current collecting portion 42 . This structure is simple and easy to form.

[0142] In some embodiments, see Figures 8 to 10 At least one end of the heat exchange element 31 along the first direction extends toward the bottom of the collecting portion 42 to form a sealing portion 312 , and the sealing portion 312 is sealed with the edge of the collecting space 421 .

[0143] Exemplarily, a sealing portion 312 is provided at one end of the heat exchange member 31 corresponding to the manifold space 421.

[0144] The sealing portion 312 is in sealing cooperation with the edge of the manifold space 421. In this way, the situation where the heat exchange medium flows out from the gap between the sealing portion 312 and the manifold space 421 can be improved.

[0145] In this embodiment, by providing the sealing portion 312 on the heat exchange member 31 so that the sealing portion 312 is in sealing cooperation with the edge of the manifold space 421, a closed manifold cavity is jointly defined by the heat exchange member 31 and the manifold portion 42, which is convenient for forming and reduces the manufacturing difficulty.

[0146] In some embodiments, please refer to Figures 11 to 12 , a step 424 is formed by the depression of the edge of the manifold space 421, and the sealing portion 312 is in sealing cooperation with the step 424.

[0147] Exemplarily, the step 424 surrounds the edge of the manifold space 421.

[0148] In this embodiment, by forming the step 424 by the depression of the edge of the manifold space 421 and the sealing portion 312 being in sealing cooperation with the step 424, on the one hand, the step 424 can position the sealing portion 312, thereby improving the assembly efficiency. On the other hand, the setting of the step 424 is more conducive to improving the sealing performance between the sealing portion 312 and the manifold portion 42.

[0149] In some embodiments, please refer to Figures 11 to 12 , the main body portion 41 and the manifold portion 42 are of an integral structure.

[0150] In this way, it is beneficial to reduce the number of components, improve the assembly efficiency, and is beneficial to enhancing the structural strength between the main body portion 41 and the manifold portion 42.

[0151] The specific connection manner between the heat exchange member 31 and the end plate 40 is not limited. Exemplarily, the heat exchange member 31 is at least fixedly connected, clamped or welded to the end plate 40.

[0152] In some embodiments, please refer to Figure 13 , the heat exchange member 31 is integrally formed with at least a part of the box body assembly 20.

[0153] Here, it can be that a part of the box body assembly 20 is integrally formed with the heat exchange member 31, or it can be that the entire box body is integrally formed with the heat exchange member 31.

[0154] In this way, it is beneficial to reduce the number of components and improve the assembly efficiency.

[0155] In some embodiments, please refer to Figure 13, the box body assembly 20 includes a first box body 21 and a second box body 22 connected to each other. The first box body 21 is disposed above the second box body 22 and encloses at least part of an accommodation space.

[0156] Here, the first box body 21 and the second box body 22 can enclose part of the accommodation space, or can enclose the entire accommodation space.

[0157] Exemplarily, please refer to Figure 13 , the box body assembly 20 further includes an upper cover 23. The upper cover 23 is disposed above the first box body 21 and encloses part of the accommodation space.

[0158] Exemplarily, please refer to Figure 13 , at least one heat exchange member 31 includes a first heat exchange member. The first box body 21 and the first heat exchange member are an integrally formed structure by extrusion molding.

[0159] Exemplarily, please refer to Figure 13 , at least one heat exchange member 31 includes a second heat exchange member. The second box body 22 and the second heat exchange member are an integrally formed structure by extrusion molding.

[0160] In some embodiments, please refer to Figures 5 to 6 , a connecting portion 313 is provided on at least one side of the heat exchange member 31 along a second direction. The connecting portion 313 is connected to at least the box body assembly 20. The first direction, the second direction and the height direction of the battery device 100 intersect.

[0161] That the connecting portion 313 is connected to at least the box body assembly 20 means that in addition to being connected to the box body assembly 20, the connecting portion 313 can also be connected to other components of the battery device 100. Exemplarily, the connecting portion 313 is also connected to the end plate 40.

[0162] Here, the connecting portion 313 can be provided on one side of the heat exchange member 31 along the second direction, or the connecting portion 313 can be provided on both sides of the heat exchange member 31 along the second direction.

[0163] In this embodiment, by providing the connecting portion 313 on at least one side of the heat exchange member 31 along the second direction and connecting the connecting portion 313 to the box body assembly 20, it is beneficial to improve the connection reliability of the heat exchange member 31.

[0164] In some embodiments, the heat exchange member 31 is fixedly connected, snap-connected or welded to the box body assembly 20.

[0165] Exemplarily, a plurality of first fastening holes are formed in the connecting portion 313. The plurality of first fastening holes are arranged along the first direction. The box body assembly 20 is correspondingly provided with a plurality of second fastening holes. The heat exchange member 31 and the box body assembly 20 are connected by sequentially passing fasteners through the first fastening holes and the second fastening holes.

[0166] In some embodiments, referring to Figures 5 to 6 , at least one side of the heat exchange member 31 in the second direction is provided with a flanging 314.

[0167] Exemplarily, at least part of the battery cell 11 abuts against the flanging 314. That is to say, the side surface of the battery cell 11 in the second direction abuts against the flanging 314.

[0168] Here, the flanging 314 can be used to restrain the battery layer in the second direction and at least bear the expansion force of the battery cell 11. The expansion force here specifically refers to the acting force exerted on the box body assembly 20 due to the expansion deformation of the battery cell 11.

[0169] In this embodiment, by providing the flanging 314, it is beneficial to block the adhesive, thereby further improving the situation of adhesive overflow. In addition, the flanging 314 can also be used to restrain the battery layer in the second direction and at least bear the expansion force of the battery cell 11.

[0170] In some embodiments, referring to Figure 3 , the dimension h1 of the battery cell 11 in the height direction of the battery device 100 and the dimension h2 of the battery cell 11 in the first direction are smaller than the dimension h3 of the battery cell 11 in 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 in the second direction is in the range of 300 mm to 1200 mm.

[0171] The dimension of the battery cell 11 in the second direction can be a point value of any one of 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 560 mm, 600 mm, 650 mm, 700 mm, 780 mm, 800 mm, 830 mm, 860 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, 1150 mm, 1200 mm or a point value between any two of them.

[0172] Here, h1, h2 and h3 can be measured by measuring tools such as vernier calipers at normal temperature before the battery device 100 is used.

[0173] It should be noted that h1, h2 and h3 do not include the dimensions of the pole post 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.

[0174] In this embodiment, by setting the dimension of the battery cell 11 in the second direction to be in the range of 300 mm to 1200 mm, the capacitance and assembly efficiency of the battery device 100 can be taken into account.

[0175] Exemplarily, the battery cell 11 in this embodiment may be a blade battery, which is long and thin in shape.

[0176] It may be that the dimension of the battery cell 11 in the height direction of the battery device 100 is greater than the dimension of the battery cell 11 in the first direction, or the dimension of the battery cell 11 in the height direction of the battery device 100 is less than the dimension of the battery cell 11 in the first direction.

[0177] It can be understood that while facilitating the stacking of the battery cells 11 in the first direction, it is also possible to facilitate the stacking of the battery cells 11 in the height direction. That is to say, the number of battery cells 11 can be increased in the first direction and the height direction to increase the capacitance of the battery device 100.

[0178] In some embodiments, the battery cell 11 further includes a pole and / or a pressure relief structure, and the pole and / or the pressure relief structure are arranged on at least one side of the battery cell 11 in the second direction. The first direction, the second direction, and the height direction of the battery device 100 intersect.

[0179] It can be understood that the battery cells 11 of each battery layer are arranged in the first direction, and the battery layers are stacked in the height direction of the battery device 100. Thus, it is not convenient to arrange the pole and / or the pressure relief structure in the first direction and the height direction of the battery device 100. For example, if the pole and / or the pressure relief structure are arranged in the first direction or the height direction of the battery device 100, it is necessary to avoid the pole and / or the pressure relief structure, which is not conducive to improving the structural compactness.

[0180] In this way, when the battery cells 11 are stacked in the first direction, the pole is arranged on the side of the battery cell 11, which is convenient for electrically connecting multiple battery cells 11 to achieve series and / or parallel connection. It should be noted that the pole includes a positive pole and a negative pole. During the charging and discharging process of the battery, the positive pole and the negative pole are electrically connected to form a current loop, or the positive poles and / or negative poles of multiple battery cells 11 can be electrically connected to achieve series and / or parallel connection.

[0181] In this embodiment, by arranging the pole and / or the pressure relief structure on at least one side of the battery cell 11 in the second direction, on the one hand, it is beneficial to improve the structural compactness of the battery device 100, and on the other hand, it is also beneficial to reduce the situation of damaging the pole and / or the pressure relief structure during the stacking of the battery cells 11 and / or the battery layers.

[0182] In some embodiments, the accommodation space is divided into at least two accommodation areas in the first plane. The battery pack 10 includes at least two battery packs 10, at least one battery pack 10 is placed in each accommodation area, and each battery pack 10 includes multiple battery layers stacked in the height direction of the battery device 100.

[0183] The accommodation space is divided into at least two accommodation areas in the first plane, and at least one battery pack 10 is placed in each accommodation area. That is to say, one battery pack 10 can be placed in each accommodation area, or multiple battery packs 10 can be placed.

[0184] Exemplarily, the battery device 100 includes structural beams disposed in the accommodation space to divide the accommodation space into at least two accommodation areas in the first plane. The arrangement of the structural beams is conducive to making full use of the accommodation space and improving the structural compactness of the battery device 100.

[0185] Exemplarily, the structural beam includes a vertical beam extending along the first direction.

[0186] Exemplarily, the structural beam includes a cross beam extending along the second direction, the second direction intersects with the first direction and is parallel to the first plane.

[0187] Exemplarily, the cross beam can be an expansion beam, and an expansion beam is provided at at least one end of the battery layer along the first direction.

[0188] The first plane is perpendicular to the height direction of the battery device 100. That is to say, the accommodation space is divided into at least two accommodation areas in a plane perpendicular to the height direction of the battery device 100.

[0189] Here, by dividing the accommodation space into at least two accommodation areas in the first plane, setting the battery pack 10 to include at least two battery packs 10, and each battery pack 10 includes multiple battery layers stacked in the height direction of the battery device 100, and at least one battery pack 10 is placed in each accommodation area. In this way, on the one hand, it is conducive to increasing the power of the battery device 100, and on the other hand, it is also conducive to making full use of the space in the box assembly 20 and improving the energy density of the battery device 100.

[0190] It should be noted that there are various arrangements of the battery packs 10.

[0191] In some embodiments, at least part of the battery packs 10 are arranged along the first direction.

[0192] That is to say, the arrangement direction of at least part of the battery packs 10 is the same as the arrangement direction of the battery cells 11 of the battery layer.

[0193] In other embodiments, please refer to Figures 2 to 4 , at least part of the battery packs 10 are arranged along the second direction, the second direction intersects with the first direction and is parallel to the first plane.

[0194] The second direction intersects with the first direction. That is to say, the second direction is not parallel to the first direction. Exemplarily, the second direction is perpendicular to the first direction.

[0195] That is to say, the arrangement direction of at least part of the battery pack 10 intersects with the arrangement direction of the battery cells 11 of the battery layer.

[0196] In some other embodiments, part of the battery packs 10 are arranged in a first direction, and another part of the battery packs 10 are arranged in a second direction.

[0197] In the description of the present disclosure, the descriptions referring to the terms "in one embodiment", "in some embodiments", "in some other embodiments", "in still some other embodiments", or "exemplary", etc. mean that the specific features, structures, materials, or characteristics described in connection 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 expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples.

[0198] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box assembly, wherein the box assembly has a receiving space inside; A battery assembly, the battery assembly comprising a plurality of battery layers stacked along a height direction of the battery device, each of the battery layers comprising a plurality of battery cells arranged along a first direction, and the plurality of battery layers being arranged in the accommodation space; A thermal management component, wherein the thermal management component comprises at least one heat exchange component, wherein the heat exchange component is disposed between the plurality of battery layers, or the heat exchange component is disposed between the battery layer and the box component; wherein the at least one heat exchange component has at least one medium flow channel inside, wherein the at least one medium flow channel is linear and runs through both ends of the at least one heat exchange component along the first direction, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery layer; Wherein, the heat exchange component is provided with a first matching plane and a second matching plane on opposite sides along the height direction of the battery device respectively; The size of the battery cell along the height direction of the battery device and the size of the battery cell along the first direction are smaller than the size 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 size of the battery cell along the second direction is in the range of 300mm to 1200mm.

2. The battery device according to claim 1, characterized in that: 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, and the battery cells of the battery layer abut against the end plate.

3. The battery device according to claim 2, characterized in that: The end plate includes a main body and a current collecting part. The battery cells of the battery layer abut against the main body. Both ends of the heat exchange member along the first direction are sealed and connected to the current collecting part.

4. The battery device according to claim 3, characterized in that: At least part of the flow collecting portion is provided with a flow collecting space and a liquid outlet communicating with the flow collecting space, and the flow collecting space is communicated with at least part of the medium flow channel.

5. The battery device according to claim 4, characterized in that: At least part of the collecting part is formed with a connecting channel, one end of which is connected to the collecting space, and the other end of which passes through the side wall of the collecting part away from the heat exchange element along the first direction to form the liquid outlet.

6. The battery device according to claim 4, characterized in that: The bottom of the current collecting portion is recessed to form the current collecting space.

7. The battery device according to claim 6, characterized in that: At least one end of the heat exchange member along the first direction extends toward the bottom of the collecting portion to form a sealing portion, and the sealing portion is sealed and matched with the edge of the collecting space.

8. The battery device according to claim 7, characterized in that: The edge of the current collecting space is recessed to form a step, and the sealing portion is in sealing cooperation with the step.

9. The battery device according to any one of claims 3 to 8, characterized in that: The main body and the current collecting part are an integrated structure.

10. The battery device according to any one of claims 2 to 8, characterized in that: The heat exchange element is at least fastened, clamped or welded to the end plate.

11. The battery device according to any one of claims 1 to 8, characterized in that: The heat exchange element is configured as an integral structure formed by extrusion.

12. The battery device according to any one of claims 1 to 8, characterized in that: The heat exchange element is integrally formed with at least a portion of the box assembly.

13. The battery device according to claim 12, characterized in that: The box assembly comprises a first box and a second box connected to each other, wherein the first box is arranged above the second box and surrounds at least a portion of the accommodation space; The at least one heat exchange element comprises a first heat exchange element, the first box and the first heat exchange element are an integral structure formed by extrusion; and / or, The at least one heat exchange element includes a second heat exchange element, and the second box body and the second heat exchange element are an integral structure formed by extrusion.

14. The battery device according to any one of claims 1 to 8, characterized in that: The heat exchange member is provided with a connection portion on at least one side along the second direction, and the connection portion is at least connected to the box assembly. The first direction, the second direction and the height direction of the battery device intersect.

15. The battery device according to claim 14, characterized in that: The heat exchange element is fastened, clamped or welded to the box assembly.

16. The battery device according to any one of claims 1 to 8, characterized in that: At least one side of the heat exchange member along the second direction is provided with a flange, and at least part of the battery cells abut against the flange.

17. The battery device according to any one of claims 1 to 8, characterized in that: The battery cell further includes a pole and / or a pressure relief structure, and the pole and / or the pressure relief structure are arranged on at least one side of the battery cell along the second direction.

18. The battery device according to any one of claims 1 to 8, characterized in that: The accommodating space is separated into at least two accommodating areas in a first plane, the battery assembly includes at least two battery groups, at least one battery group is placed in each of the accommodating areas, and each of the battery groups includes multiple battery layers stacked in the height direction of the battery device.

19. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 18.

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