Battery and electric device

Abstract

The present application belongs to the technical field of batteries. Provided are a battery and an electric device. The battery comprises a plurality of battery cells, a wire harness board and a heat exchange assembly, wherein the wire harness board is electrically connected to all the battery cells, the heat exchange assembly comprises a heat exchange shell and an inverse piezoelectric element, the heat exchange shell is in thermally conductive connection with at least some of the battery cells and has an air inlet, an airflow channel and an air outlet which are in communication in sequence, and the inverse piezoelectric element is arranged in the airflow channel and electrically connected to the wire harness board, and is configured to generate vibration under a voltage applied by the battery cells, so as to drive an external airflow to enter the airflow channel from the air inlet and to be exhausted from the air outlet. In the battery provided in the present application, an airflow is driven by an inverse piezoelectric element to circulate in an airflow channel, thereby adjusting the temperature of battery cells. An airflow is used as a heat exchange medium for the battery provided in the present application, so that leakage of a liquid medium is avoided, thereby achieving relatively good safety performance.

Description

Batteries and electrical equipment

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2024102384300, filed on March 1, 2024, entitled “Batteries and Electrical Equipment,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Art

[0004] Currently, batteries typically consist of battery cells and heat exchange assemblies. The battery cells are used to provide or store electrical energy, while the heat exchange assemblies are in contact with the battery cells to absorb heat from them or transfer heat to them, thereby regulating their temperature. In related technologies, to improve the heat exchange efficiency between the heat exchange assemblies and the battery cells, these assemblies typically use liquids such as water as the heat exchange medium. However, heat exchange assemblies are susceptible to damage during processing and use, resulting in a greater risk of heat exchange medium leakage, which affects the safety performance of the battery. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a battery and an electrical device to solve the technical problem in the related art that the heat exchange medium is prone to leakage, which affects the safety performance of the battery.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] In a first aspect, a battery is provided, comprising a plurality of battery cells, a wiring harness plate, and a heat exchange assembly. The wiring harness plate is electrically connected to each of the battery cells. The heat exchange assembly comprises a heat exchange housing and an inverse piezoelectric element, wherein the heat exchange housing is thermally connected to at least some of the battery cells and has an air inlet, an air flow channel, and an air outlet that are sequentially connected, the inverse piezoelectric element is disposed in the air flow channel and electrically connected to the wiring harness plate, and the inverse piezoelectric element is configured to vibrate under a voltage applied by the battery cells to drive external airflow from the air inlet into the air flow channel and out of the air outlet.

[0008] In the technical solution of the embodiment of the present application, the battery cell can provide electrical energy to the inverse piezoelectric element through the wiring harness plate to cause the inverse piezoelectric element to vibrate. The vibrating inverse piezoelectric element can drive the external airflow into the airflow channel through the air inlet, and drive the airflow in the airflow channel to discharge the airflow channel through the air outlet. Since the heat exchange shell and the battery cell are thermally connected, the heat exchange shell can exchange heat with the battery cell. In this way, when the airflow circulates in the airflow channel, the airflow can indirectly exchange heat with the battery cell through the heat exchange shell, thereby regulating the temperature of the battery cell. It can be seen that in the technical solution of the embodiment of the present application, airflow is used as the heat exchange medium, and there will be no leakage of liquid medium, which is beneficial to improving the safety performance of the battery.

[0009] In some embodiments, the heat exchange housing is a plate-shaped structure having two oppositely disposed plate surfaces, and the heat exchange housing is thermally connected to the battery cells through the plate surfaces.

[0010] In the technical solution of the embodiment of the present application, the heat exchange shell is thermally connected to the battery cell through the plate surface, the heat exchange area between the heat exchange shell and the battery cell can be designed to be larger, and the heat exchange shell can be thermally connected to multiple battery cells at the same time through the plate surface. The heat exchange shell and multiple battery cells can be arranged more compactly, which is beneficial to improving the space utilization of the battery.

[0011] In some embodiments, the heat exchange assembly further includes a protective plate, and the protective plate is provided on at least one of the plate surfaces of the heat exchange shell, with a gap being provided between the plate surface and the protective plate.

[0012] In the technical solution of the embodiment of the present application, since there is a gap between the protective plate and the plate surface, when the protective plate is squeezed or collided, the gap between the protective plate and the plate surface can provide space for the protective plate to deform, thereby reducing the risk of the heat exchange shell being directly squeezed, and thereby minimizing deformation or damage to the air flow channel or the inverse piezoelectric element inside the heat exchange shell.

[0013] In some embodiments, the air inlet and / or the air outlet are arranged on the plate surface and are located in the area corresponding to the gap, and an opening communicating with the gap is formed between the protective plate and the plate surface.

[0014] In the technical solution of the embodiment of the present application, by arranging the air inlet and / or air outlet in the area corresponding to the gap on the plate surface, when the plate surface is indirectly heat-conductingly connected to the battery cell through the protective plate, the external airflow can still enter the airflow channel through the opening, the gap, and the air inlet in sequence, and the airflow in the airflow channel can still be discharged to the outside of the heat exchange component through the air outlet, the gap, and the opening in sequence. The air inlet and / or air outlet on the plate surface will not be blocked by the battery cell, which is conducive to making the heat exchange component more flexibly heat-conductingly connected to the battery cell.

[0015] In some embodiments, the heat exchange shell includes a first plate, a second plate, and a third plate arranged in sequence and a side plate arranged around the outside of the first plate, the second plate, and the third plate. The first plate is provided with the air inlet, the second plate is provided with a plurality of through holes, the side plate is provided with the air outlet, the third plate is thermally conductively connected to the battery cell, and the inverse piezoelectric element is provided between the first plate and the second plate.

[0016] In the technical solution of the embodiment of the present application, the inverse piezoelectric element will vibrate after receiving the electric energy applied by the battery cell. The vibrating inverse piezoelectric element can drive the external air flow through the air inlet into the space between the first plate and the second plate, and through the through hole on the second plate into the space between the second plate and the third plate. The number of inverse piezoelectric elements, the aperture of the through hole, the spacing between the second plate and the third plate, and other parameters are designed to make the air flow entering between the second plate and the third plate form a high-pressure and high-speed airflow. The high-pressure and high-speed airflow can efficiently exchange heat with the third plate, and then can efficiently exchange heat with the battery cell thermally connected to the third plate. Moreover, after the airflow flows out from the air outlet to the outside of the heat exchange shell, it can form an airflow with a faster flow rate on the outside of the battery cell, which can further exchange heat with the battery cell or other structures of the battery.

[0017] In some embodiments, when the heat exchange housing has two oppositely disposed plate surfaces, the air inlet and the air outlet are disposed on the two oppositely disposed plate surfaces, so as to facilitate rapid flow of gas through the battery cells and thereby achieve rapid heat dissipation.

[0018] In some embodiments, one side edge of the two oppositely disposed panels defines the air inlet, and the other side edge of the two oppositely disposed panels defines the air outlet.

[0019] In some embodiments, the heat exchange housing includes a side edge arranged between edges of the two plate surfaces, and the air inlet and / or the air outlet is arranged on the side edge.

[0020] In the above two technical solutions, the air inlet and the air outlet are respectively arranged at the two side ends of the plate surface, so that the air flow flows in the flat space of the heat exchange shell in a direction approximately parallel to the plate surface, which increases the heat exchange area with the heat exchange shell and improves the heat dissipation effect.

[0021] In some embodiments, the heat exchange shell includes a first plate, a second plate, and a third plate arranged in sequence and spaced apart, and a side plate arranged around the outside of the first plate, the second plate, and the third plate. The inverse piezoelectric element is arranged between the first plate and the second plate, the second plate is provided with a plurality of through holes, the third plate is thermally connected to the battery cell, the air inlet is arranged on the first plate, and the air outlet is arranged at the portion of the side plate corresponding to the portion between the second plate and the third plate.

[0022] In this technical solution, the heat exchange shell is divided into two spaces by a second plate, the air inlet is connected to the upper space, and the air outlet is connected to the lower space. The inverse piezoelectric element is independently arranged in the upper space to ensure good controllability of the airflow direction and protect the inverse piezoelectric element from reverse interference of the airflow, thereby improving the heat dissipation effect.

[0023] In some embodiments, the heat exchange housing has a dimension of less than 4 mm in the layout direction of the two plate surfaces. The height of the heat exchange housing is smaller than that of a conventional liquid cooling plate, and the volume of the heat exchange housing is smaller, which is conducive to improving the space utilization of the battery.

[0024] In some embodiments, the battery cell includes a battery housing and a pole, the battery housing having a top wall and a bottom wall arranged opposite to each other in a first direction and a side wall connected between the top wall and the bottom wall, the pole is arranged on the top wall and electrically connected to the wiring harness plate; the bottom wall is thermally connected to at least one of the heat exchange housings, and / or the side wall is thermally connected to at least one of the heat exchange housings.

[0025] In the technical solution of the embodiments of this application, the heat exchange assembly is thermally connected to the bottom or side wall of the battery housing, which can minimize interference with the electrical connection between the pole and the wiring harness plate. Furthermore, when the heat exchange assembly is thermally connected to the side wall of the battery housing, the contact area between the heat exchange assembly and the battery housing can be designed to be larger, which is conducive to improving heat exchange efficiency.

[0026] In some embodiments, a plurality of the battery cells form at least one battery pack, the battery pack includes a plurality of the battery cells arranged along the second direction, the heat exchange component is provided on one or both sides of the third direction of the battery pack, the heat exchange component is thermally connected to the side walls of each of the battery cells of the battery pack, and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] In the technical solution of the embodiment of the present application, the heat exchange component directly exchanges heat with each battery cell of the battery pack through heat conduction, which has a high heat exchange efficiency and can keep the temperature of each battery cell in the battery pack as consistent as possible.

[0028] In some embodiments, the air inlet is located on a side of the heat exchange housing that is close to the bottom wall in the first direction, and the air outlet is located on a side of the heat exchange housing that is close to the top wall in the first direction. With this arrangement, the airflow exhausted by the heat exchange assembly flows toward the poles of each battery cell in the battery pack. The airflow exhausted by the heat exchange assembly can dissipate heat or heat the electrical connection between the poles and the wiring harness plate, thereby maintaining the temperature of the electrical connection between the poles and the wiring harness plate within an appropriate range and improving the safety performance of the battery.

[0029] In some embodiments, there are multiple battery packs and multiple heat exchange components, and the multiple heat exchange components and the multiple battery packs are alternately arranged along the third direction.

[0030] In the technical solution of the embodiment of the present application, heat exchange components and battery packs are alternately arranged, and multiple heat exchange components can exchange heat with multiple battery packs respectively, which can make the temperature of multiple battery packs more uniform and avoid the formation of local high or low temperatures as much as possible.

[0031] In some embodiments, the battery also includes two busbars, both of which extend along the third direction and are arranged on one side or both sides of the multiple battery packs and the multiple heat exchange components in the second direction, and the two busbars are used to electrically connect each of the inverse piezoelectric elements to the wiring harness board.

[0032] In the technical solution of the embodiment of the present application, two busbars are arranged on one side in the second direction of multiple battery packs, or a busbar is arranged on both sides in the second direction of multiple battery packs, so that one of the two busbars electrically connects the positive pole of the inverse piezoelectric element of each heat exchange component to the wiring harness board, and the other of the two busbars electrically connects the negative pole of the inverse piezoelectric element of each heat exchange component to the wiring harness board, so that all the inverse piezoelectric elements can be electrically connected to the wiring harness board. Two busbars are arranged, and the two busbars are arranged on one side or both sides of multiple battery packs and multiple heat exchange components in the second direction, which can simplify the routing between the inverse piezoelectric elements and the wiring harness board.

[0033] In some embodiments, a plurality of the battery cells form a plurality of battery modules, the battery modules include a plurality of the battery cells arranged in an array, the number of the heat exchange components is multiple, and the plurality of heat exchange components are respectively arranged on one side of the plurality of battery modules close to the bottom wall in the first direction, and each of the heat exchange components is thermally connected to the bottom wall of at least part of the battery cells of the corresponding battery module.

[0034] In the technical solution of the embodiment of the present application, multiple heat exchange components and multiple battery modules exchange heat through heat conduction respectively. The heat exchange efficiency of the heat exchange components and the battery modules is high, and the temperatures of the multiple battery modules can be kept as consistent as possible.

[0035] In some embodiments, the plurality of battery modules are arranged in a rectangular array along the second direction and the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; wherein the size of the heat exchange component in the second direction is smaller than the size of the battery module in the second direction, and the air inlet and the air outlet are respectively arranged on both sides of the heat exchange shell in the third direction.

[0036] In the technical solution of the embodiment of the present application, because the size of the heat exchange housing in the second direction is smaller than the size of the battery module in the second direction, some of the battery cells in the battery module are directly thermally connected to the heat exchange housing, while other battery cells are not directly thermally connected to the heat exchange housing. For the battery cells directly thermally connected to the heat exchange housing, these battery cells exchange heat with the heat exchange housing through heat conduction. For the battery cells not directly thermally connected to the heat exchange housing, since the air inlet and air outlet are respectively arranged on both sides of the heat exchange housing in the third direction, the airflow generated by the heat exchange assembly can cover the battery cells that are not directly thermally connected to the heat exchange housing. The heat exchange assembly can exchange heat with all the battery cells in the battery module. In addition, the size of the heat exchange assembly in the second direction is relatively small, and the installation space required for the heat exchange assembly is small, which is conducive to improving the space utilization of the battery.

[0037] In some embodiments, the plurality of battery modules are arranged in a rectangular array along the second direction and the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the size of the heat exchange component in the third direction is smaller than the size of the battery module in the third direction, and the air inlet and the air outlet are respectively arranged on both sides of the heat exchange shell in the second direction.

[0038] In the technical solution of the embodiment of the present application, because the size of the heat exchange housing in the third direction is smaller than the size of the battery module in the third direction, some of the battery cells in the battery module are directly thermally connected to the heat exchange housing, while other battery cells are not directly thermally connected to the heat exchange housing. For the battery cells directly thermally connected to the heat exchange housing, these battery cells exchange heat with the heat exchange housing through heat conduction. For the battery cells not directly thermally connected to the heat exchange housing, since the air inlet and air outlet are respectively arranged on both sides of the heat exchange housing in the second direction, the airflow generated by the heat exchange assembly can cover the battery cells not directly thermally connected to the heat exchange housing. The heat exchange assembly can exchange heat with all the battery cells in the battery module. In addition, the size of the heat exchange assembly in the third direction is relatively small, and the installation space required for the heat exchange assembly is small, which is conducive to improving the space utilization of the battery.

[0039] In some embodiments, there are multiple wiring harness plates, and the multiple wiring harness plates are respectively arranged on one side of the multiple battery modules close to the pole in the first direction. The multiple wiring harness plates are respectively electrically connected to the poles of the multiple battery modules, and the multiple wiring harness plates are respectively electrically connected to the multiple inverse piezoelectric elements.

[0040] In the technical solution of the embodiment of the present application, multiple wiring harness plates are respectively arranged on one side of multiple battery modules close to the pole in the first direction, which can simplify the routing between the wiring harness plates and the corresponding inverse piezoelectric elements and the corresponding battery modules.

[0041] In some embodiments, the battery further includes a box having a housing for accommodating the battery cell, the wiring harness plate, and the heat exchange assembly. The box is further provided with an intake valve and an exhaust valve respectively connected to the housing cavity.

[0042] In the technical solution of the embodiment of the present application, the box body can protect the battery cells, wiring harness plates and heat exchange components. The intake valve and exhaust valve can control the flow of air inside and outside the box body, thereby keeping the air pressure inside and outside the box body balanced, and also enabling the heat exchange components to achieve a higher heat exchange efficiency.

[0043] In a second aspect, an electrical device is provided, wherein the electrical device includes the battery described in the first aspect.

[0044] In the technical solution of the embodiment of the present application, the electrical device includes the battery described in the first aspect above, so that the electrical device also has the technical effects corresponding to the aforementioned battery, which will not be repeated here.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0048] FIG2 is a schematic structural diagram of multiple battery packs, multiple heat exchange components, and a wiring harness plate of a battery provided in some embodiments of the present application;

[0049] FIG3 is a schematic structural diagram of a single battery pack and a single heat exchange component of a battery provided in some embodiments of the present application;

[0050] FIG4 is a schematic diagram of an exploded structure of a heat exchange assembly of a battery provided in some embodiments of the present application;

[0051] FIG5 is a bottom view schematic diagram of the heat exchange assembly of a battery provided in some embodiments of the present application;

[0052] FIG6 is a schematic diagram of the front view of a heat exchange assembly of a battery provided in some embodiments of the present application;

[0053] FIG7 is a schematic structural diagram of a heat exchange assembly of a battery provided in some embodiments of the present application;

[0054] FIG8 is a schematic structural diagram of a heat exchange assembly of a battery provided in other embodiments of the present application;

[0055] FIG9 is a schematic structural diagram of a heat exchange assembly of a battery provided in some further embodiments of the present application;

[0056] FIG10 is a schematic diagram of an exploded structure of a battery box, multiple wiring harness plates, and multiple heat exchange components provided in some embodiments of the present application;

[0057] FIG11 is a schematic diagram of an exploded structure of a battery box and multiple heat exchange components provided in some embodiments of the present application;

[0058] FIG12 is a schematic top view of the structure of a battery box and multiple heat exchange components provided in some embodiments of the present application.

[0059] In the figures, the following reference numerals are used: 1-vehicle; 10-battery; 100-battery pack; 110-battery cell; 111-battery housing; 1111-top wall; 1112-bottom wall; 1113-side wall; 112-pole; 200-wiring harness plate; 300-heat exchange assembly; 310-heat exchange housing; 3101-air inlet; 3102-air outlet; 3103-air flow channel; 3104-board surface; 3105-side edge; 311-first board; 312-second board; 3121-through hole; 313 -third plate; 314-side plate; 315-support member; 320-inverse piezoelectric element; 321-driving part; 322-first fixing part; 323-swinging part; 324-second fixing part; 325-vibrating part; 330-protective plate; 3301-gap; 3302-opening; 331-protective plate body; 332-flange; 340-first electrical connector; 350-second electrical connector; 400-bus; 500-box; 510-accommodating chamber; 20-frame; 30-controller; 40-motor. DETAILED DESCRIPTION

[0060] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0061] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0063] Currently, batteries typically consist of battery cells and heat exchange assemblies. The battery cells are used to provide or store electrical energy, while the heat exchange assemblies are in contact with the battery cells to absorb heat from them or transfer heat to them, thereby regulating their temperature. In related technologies, to improve the heat exchange efficiency between the heat exchange assemblies and the battery cells, these assemblies typically use liquids such as water as the heat exchange medium. However, heat exchange assemblies are susceptible to damage during processing and use, resulting in a greater risk of heat exchange medium leakage, which affects the safety performance of the battery.

[0064] In order to improve the safety performance of the battery, the present application provides a battery, which includes multiple battery cells, a wiring harness plate and a heat exchange assembly. The wiring harness plate is electrically connected to each battery cell. The heat exchange assembly includes a heat exchange shell and an inverse piezoelectric element. The heat exchange shell is thermally conductively connected to at least some of the battery cells and has an air inlet, an air flow channel and an air outlet that are connected in sequence. The inverse piezoelectric element is arranged in the air flow channel and electrically connected to the wiring harness plate. The inverse piezoelectric element will vibrate when it receives the voltage applied by the battery cell. The vibrating inverse piezoelectric element can drive external airflow from the air inlet into the air flow channel and be discharged from the air outlet, thereby realizing heat exchange between the battery cell and the heat exchange assembly, and the heat exchange assembly avoids the use of liquid heat exchange medium, thereby improving the safety performance of the battery.

[0065] The technical solutions described in the embodiments of the present application can be applied to vehicles, such as fuel vehicles, gas vehicles or new energy vehicles, wherein new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. The technical solutions described in the embodiments of the present application can also be applied to other electrical devices that use batteries, such as mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Among them, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, etc.

[0066] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 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 vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 1, and the battery 10 can be provided at the bottom, head or tail of the frame 20 of the vehicle 1. The battery 10 can be used to power the vehicle 1, for example, the battery 10 can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 30 and a motor 40, and the controller 30 is used to control the battery 10 to power the motor 40, for example, for starting, navigating and driving the vehicle 1.

[0067] In some embodiments of the present application, the battery 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0068] Referring to Figures 2 and 3 , the battery 10 provided in the embodiment of the present application includes a plurality of battery cells 110, a wiring harness plate 200, and a heat exchange assembly 300. The wiring harness plate 200 is electrically connected to each battery cell 110. Referring to Figures 4 to 8 , the heat exchange assembly 300 includes a heat exchange housing 310 and an inverse piezoelectric element 320. The heat exchange housing 310 is thermally connected to at least some of the battery cells 110. Referring to Figures 7 and 8 , the heat exchange housing 310 has an air inlet 3101, an air flow channel 3103, and an air outlet 3102 that are sequentially connected. The inverse piezoelectric element 320 is disposed in the air flow channel 3103 and is electrically connected to the wiring harness plate 200. The inverse piezoelectric element 320 is configured to vibrate under a voltage applied by the battery cells 110, thereby driving external airflow from the air inlet 3101 into the air flow channel 3103 and out through the air outlet 3102.

[0069] The multiple battery cells 110 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 110. The multiple battery cells 110 can be directly connected in series, in parallel, or in a hybrid connection. Alternatively, multiple battery cells 110 can be connected in series, in parallel, or in a hybrid connection to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a whole.

[0070] Each battery cell 110 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be recharged after discharge to activate the active material and continue to be used. A primary battery refers to a battery cell that cannot be recharged to activate the active material and continue to be used after the power is exhausted. Battery cells 110 can also 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 are not limited to these. Battery cells 110 can be cylindrical battery cells, prismatic battery cells, or battery cells of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic battery cells. Polygonal prismatic battery cells, such as hexagonal battery cells, are not particularly limited in this application.

[0071] The wiring harness board 200 may include a wiring harness board body and a circuit board arranged on the wiring harness board body. The wiring harness board body may be a plastic board made of polyurethane, polystyrene or other materials. The circuit board may be a printed circuit board or a flexible circuit board. The circuit board is used to electrically connect with each battery cell 110 and to realize series and parallel connection between multiple battery cells 110.

[0072] The heat exchange assembly 300 includes a heat exchange shell 310 and an inverse piezoelectric element 320, which are used to adjust the temperature of the battery cell 110, wherein the heat exchange shell 310 is thermally connected to the battery cell 110. It can be understood that the heat exchange shell 310 is in direct contact or indirect contact with the battery cell 110. When the heat exchange shell 310 is in indirect contact with the battery cell 110, the two can be connected through a protective medium such as a protective plate 330 or a medium with excellent thermal conductivity such as a silicone pad. The heat exchange shell 310 can be thermally connected to some of the battery cells 110, and the heat exchange shell 310 can also be thermally connected to all of the battery cells 110. There is no special restriction in this application.

[0073] The inverse piezoelectric element 320 is an element with an inverse piezoelectric effect. An element with an inverse piezoelectric effect can deform or vibrate under the influence of an electric field or potential difference, that is, it can convert electrical energy into mechanical energy. In this embodiment, the inverse piezoelectric element 320 is housed in the air flow channel 3103 of the heat exchange housing 310 and is indirectly electrically connected to the battery cell 110 through the wiring harness plate 200. It can vibrate under the influence of the potential difference applied by the battery cell 110, thereby causing the airflow outside the heat exchange housing 310 to enter the air flow channel 3103 through the air inlet 3101 and be discharged from the air flow channel 3103 through the air outlet 3102. It can be understood that the inverse piezoelectric element 320 in this embodiment is used to convert electrical energy into mechanical energy.

[0074] Optionally, the energy conversion structure for converting electrical energy into mechanical energy in the inverse piezoelectric element 320 can be made of ceramic material. To drive the flow of air, the inverse piezoelectric element 320 can also include a structure that is easily vibrated by the vibration source (i.e., the energy conversion structure), such as a flexible sheet.

[0075] Please refer to Figure 4. The positive and negative electrodes of the inverse piezoelectric element 320 can be electrically connected to the wiring harness plate 200 through the first electrical connector 340 and the second electrical connector 350 respectively. In some implementations, the first electrical connector 340 and the second electrical connector 350 can extend to the outside of the air flow channel 3103 through the air inlet 3101 or the air outlet 3102 on the heat exchange shell 310, and then be electrically connected to the wiring harness plate 200; in other implementations, the heat exchange shell 310 also has an electrical connection port (not shown in the figure, the same below) connected to the air flow channel 3103, and the first electrical connector 340 and the second electrical connector 350 can extend to the outside of the air flow channel 3103 through the electrical connection port, and then be electrically connected to the wiring harness plate 200.

[0076] The vibration frequency of the inverse piezoelectric element 320 can be within the ultrasonic frequency range, for example, greater than 15 kHz. In some implementations, the vibration frequency of the inverse piezoelectric element 320 can be greater than 20 kHz. This ultrasonic frequency helps reduce human-perceivable noise from the heat exchange assembly 300. Furthermore, the gas flow rate at the gas outlet 3102 of the inverse piezoelectric element 320 can reach 200 km / h.

[0077] The heat exchange assembly 300 has a variety of structures. In one implementation, please refer to Figure 7. An air inlet 3101 and an air outlet 3102 are provided on opposite sides of the heat exchange shell 310. The inverse piezoelectric element 320 includes two driving parts 321. The two driving parts 321 can approach and move away from each other. The direction in which the two driving parts 321 approach and move away from each other is perpendicular to the direction from the air inlet 3101 to the air outlet 3102. When the two driving parts 321 approach each other, the airflow between the two driving parts 321 will be subjected to thrust, which can drive the airflow in the airflow channel 3103 to flow from the air inlet 3101 to the air outlet 3102.

[0078] In this embodiment, the inverse piezoelectric element 320 may also include a first fixed portion 322, which connects the roots of the two driving portions 321, and the free ends of the driving portions 321 vibrate to guide the gas. The structure for converting electrical energy into mechanical energy may be the first fixed portion 322, which is electrically connected to the wiring harness plate 200 and acts as a vibration source to drive the driving portion 321 to vibrate. Alternatively, the structure for converting electrical energy into mechanical energy may be the driving portion 321, which is electrically connected to the wiring harness plate 200 and has both the function of energy conversion and a structure that is easy to vibrate, such as a thin sheet structure. In this case, the first fixed portion 322 is only used to connect the driving portion 321 to the inner wall of the heat exchange shell 310. Referring to FIG. 7 , the first fixed portion 322 converts electrical energy into mechanical energy, and the two driving portions 321 swing toward or away from each other under the drive of the first fixed portion 322, driving the air flow from the air inlet 3101 to the air outlet 3102.

[0079] In another implementation, referring to FIG8 , the top of the heat exchange housing 310 is provided with an air inlet 3101, and the side of the heat exchange housing 310 is provided with an air outlet 3102. The inverse piezoelectric element 320 includes a first fixed portion 322 and a swinging portion 323. The first fixed portion 322 is fixed to the inner wall of the airflow channel 3103, and one end of the swinging portion 323 is connected to the side of the first fixed portion 322 facing the air outlet 3102. The swinging portion 323 can swing about the connection point between the swinging portion 323 and the first fixed portion 322, thereby driving the airflow within the airflow channel 3103 from the air inlet 3101 to the air outlet 3102. Similarly, the structure for converting electrical energy into mechanical energy can be either the first fixed portion 322 or the swinging portion 323. 8 , the first fixed portion 322 is used to convert electrical energy into mechanical energy, and the swinging portion 323 swings under the drive of the first fixed portion 322, fanning the airflow and causing gas to flow from the air inlet 3101 to the air outlet 3102. It is understandable that the first fixed portion 322 shown in FIG8 can also be used only to fix the swinging portion 323, and the portion of the swinging portion 323 connected to the first fixed portion 322 is used to convert electrical energy into mechanical energy. The mechanical energy (vibration) is transmitted to the free end of the swinging portion 323, which vibrates with a large amplitude, driving the gas from the air inlet 3101 to the air outlet 3102.

[0080] In the technical solution of the embodiment of the present application, the battery cell 110 can provide electrical energy to the inverse piezoelectric element 320 through the wiring harness plate 200, so that the inverse piezoelectric element 320 vibrates. The vibrating inverse piezoelectric element 320 can drive the external airflow through the air inlet 3101 to enter the air flow channel 3103, and drive the airflow in the air flow channel 3103 to discharge the air flow channel 3103 through the air outlet 3102. Since the heat exchange shell 310 and the battery cell 110 are thermally connected, the heat exchange shell 310 can exchange heat with the battery cell 110. In this way, when the airflow flows in the air flow channel 3103, the airflow can indirectly exchange heat with the battery cell 110 through the heat exchange shell 310, thereby regulating the temperature of the battery cell 110. It can be seen that in the technical solution of the embodiment of the present application, airflow is used as the heat exchange medium, and there will be no leakage of liquid medium, which is beneficial to improving the safety performance of the battery 10.

[0081] Moreover, the heat exchange structure using liquid as the heat exchange medium in the related art usually includes one or both of a liquid cooling tube and a liquid cooling plate. The assembly process of the liquid cooling tube and the liquid cooling plate is complicated and difficult to automate. In the technical solution of the embodiment of the present application, gas is used as the heat exchange medium, and there is no need to set up liquid cooling tubes and liquid cooling plates, which can avoid complex and low-automation assembly operations, simplify the assembly process of the battery 10, improve production efficiency, and reduce production costs.

[0082] In addition, in the technical solution of the embodiment of the present application, the heat exchange shell 310 can be designed to be thermally connected only to part of the battery cells 110, and the airflow generated by the heat exchange shell 310 can be designed to cover another part of the battery cells 110. In this way, the heat exchange assembly 300 can effectively exchange heat with each battery cell 110, and the volume of the heat exchange shell 310 can be designed to be smaller, which is conducive to improving the space utilization of the battery 10.

[0083] Exemplarily, multiple battery cells 110 form a battery module, which includes multiple battery cells 110 arranged in a rectangular array along the length and width of the battery cells 110. A heat exchange housing 310 is disposed on one side of the multiple battery cells 110 in the height direction. The heat exchange housing 310 is thermally connected to some of the battery cells 110 in the battery module, and the airflow ejected from the heat exchange housing 310 covers some of the battery cells 110 in the remaining battery module. In this way, the length of the heat exchange housing 310 can be much smaller than the length of the battery module, and / or the width of the heat exchange housing 310 can be much smaller than the width of the battery module. For example, if the length and width of the battery module are 1000 mm and 500 mm, respectively (see Figure 5), the length L and width W of the heat exchange housing 310 can be set to 1000 mm and 30 mm, respectively.

[0084] The length and width of the liquid cooling plate used in the related art usually need to be 1000mm and 500mm. Therefore, when the heat exchange component 300 provided in this embodiment has the same height as the conventional liquid cooling plate, the volume of the heat exchange component 300 provided in this embodiment will be much smaller than the volume of the liquid cooling plate in the related art, which can greatly reduce the size of the heat exchange component 300 and thereby greatly improve the space utilization of the battery 10.

[0085] 5 to 8 , in some embodiments, the heat exchange housing 310 is a plate-like structure having two oppositely disposed plate surfaces 3104 , and the heat exchange housing 310 is thermally connected to the battery cell 110 via the plate surfaces 3104 ; it can be understood that the plate surfaces 3104 are the larger surfaces of the heat exchange housing 310 .

[0086] In some embodiments, the two plate surfaces 3104 may be flat plates, with one side edge of the two opposing plate surfaces 3104 defining an air inlet 3101, and the other side edge of the two opposing plate surfaces 3104 defining an air outlet 3102. The one side edge and the other side edge may be located on opposite sides of the plate surfaces 3104, or may be located on adjacent sides. That is, the air inlet 3101 and the air outlet 3102 of the heat exchange housing 310 are located on the narrower side of the heat exchange housing 310. Referring to FIG. 3 and FIG. 10 , the airflow direction is approximately parallel to the direction of the plate surfaces 3104, resulting in a larger heat exchange area of ​​the heat exchange housing 310 and better heat dissipation.

[0087] In some embodiments, referring to Figures 7 and 8 , the heat exchange housing 310 may further include side edges 3105 disposed between the edges of the two panels 3104. The side edges 3105 and the panels 3104 may be integrally formed or separately connected. The heat exchange housing 310 is thermally connected to the battery cells 110 via the panels 3104. In this embodiment, the air inlet 3101 and the air outlet 3102 can be arranged as follows: as shown in Figure 8, the air inlet 3101 is arranged on one of the plate surfaces 3104, and the air outlet 3102 is arranged on the side 3105; or, the air inlet 3101 is arranged on one of the plate surfaces 3104, and the air outlet 3102 is arranged on the other plate surface 3104 opposite to the plate surface 3104; or, the air inlet 3101 and the air outlet 3102 are arranged on the same plate surface 3104; or, the air inlet 3101 is arranged on the side 3105, and the air outlet 3102 is arranged on one of the plate surfaces 3104; or, as shown in Figure 7, the air inlet 3101 is arranged on one side surface 3105, and the air outlet 3102 is arranged on the other side surface 3105 opposite to the side surface 3105.

[0088] In some embodiments, the air inlet 3101 and the air outlet 3102 of a heat exchange housing 310 are not limited to one, and can be provided with multiple ones respectively.

[0089] It should be noted that a protective structure and / or a heat-conducting structure with excellent thermal conductivity may be provided on the outside of the plate surface 3104 of the heat exchange housing 310, such as a protective plate 330 or a silicone plate. When a protective structure and / or a heat-conducting structure are provided on the outside of the plate surface 3104 of the heat exchange housing 310, the plate surface 3104 of the heat exchange housing 310 is indirectly thermally connected to the battery cells 110 via the protective structure and / or the heat-conducting structure. Of course, the plate surface 3104 of the heat exchange housing 310 may also be provided without other structures, and may be in direct contact with the battery cells 110 to achieve a thermal connection between the heat exchange housing 310 and the battery cells 110.

[0090] In the technical solution of the embodiment of the present application, the heat exchange shell 310 is thermally connected to the battery cell 110 through the plate surface 3104. The heat exchange area between the heat exchange shell 310 and the battery cell 110 can be designed to be larger. Moreover, when the heat exchange shell 310 is thermally connected to multiple battery cells 110 at the same time through the plate surface 3104, the heat exchange shell 310 and the multiple battery cells 110 are arranged more compactly, which is beneficial to improving the space utilization of the battery 10.

[0091] Referring to Figures 4 to 6, in some embodiments, the heat exchange assembly 300 further includes a protective plate 330. The protective plate 330 is provided on at least one plate surface 3104 of the heat exchange shell 310, and a gap 3301 is defined between the plate surface 3104 and the protective plate 330.

[0092] Specifically, referring to Figures 4 and 6, the protective plate 330 has a protective plate body 331 and two flanges 332 arranged on opposite sides connected to the protective plate body 331. The two flanges 332 are interconnected with the plate surface 3104, and there is a gap 3301 between the protective plate body 331 and the plate surface 3104.

[0093] In the technical solution of the embodiment of the present application, since there is a gap 3301 between the protective plate 330 and the plate surface 3104, when the protective plate 330 is squeezed or collided, the gap 3301 between the protective plate 330 and the plate surface 3104 can provide space for the protective plate 330 to deform, thereby reducing the risk of the heat exchange shell 310 being directly squeezed, and thereby minimizing deformation or damage to the air flow channel 3103 or the inverse piezoelectric element 320 inside the heat exchange shell 310.

[0094] In some embodiments, the air inlet 3101 and / or the air outlet 3102 are arranged on the plate surface 3104 and are located in the area corresponding to the gap 3301. Please refer to Figure 4. An opening 3302 connected to the gap 3301 is also formed between the protective plate 330 and the plate surface 3104.

[0095] In the technical solution of the embodiment of the present application, by arranging the air inlet 3101 and / or the air outlet 3102 in the area corresponding to the gap 3301 on the plate surface 3104, when the plate surface 3104 is indirectly heat-conductingly connected to the battery cell 110 through the protective plate 330, the external airflow can still pass through the opening 3302, the gap 3301, and the air inlet 3101 in sequence to enter the airflow channel 3103, and the airflow in the airflow channel 3103 can still be discharged to the outside of the heat exchange component 300 through the air outlet 3102, the gap 3301, and the opening 3302 in sequence. The air inlet 3101 and / or the air outlet 3102 on the plate surface 3104 will not be blocked by the battery cell 110, which is conducive to making the heat exchange component 300 more flexibly heat-conductingly connected to the battery cell 110.

[0096] Referring to FIG. 9 , in some embodiments, the heat exchange housing 310 includes a first plate 311, a second plate 312, and a third plate 313, which are spaced apart in sequence, and a side plate 314 disposed around the outside of the first, second, and third plates 311, 312, 313. The inverse piezoelectric element 320 is disposed between the first and second plates 311, 312. The first plate 311 is provided with an air inlet 3101, the second plate 312 is provided with a plurality of through-holes 3121, and the side plate 314 is provided with an air outlet 3102. Specifically, the air outlet 3102 is disposed in the portion of the side plate 314 corresponding to the portion between the second and third plates 312, 313. That is, the air outlet 3102 communicates with the space between the second and third plates 312, 313. This facilitates airflow and reduces airflow interference with the inverse piezoelectric element 320. The third plate 313 is thermally connected to the battery cell 110.

[0097] Specifically, the thermal connection includes direct contact and indirect contact. The third plate 313 can be directly thermally connected to the battery housing 111. A protective plate 330 can also be provided on the side of the third plate 313 facing away from the second plate 312. When the protective plate 330 is provided on the side of the third plate 313 facing away from the second plate 312, the third plate 313 is indirectly thermally connected to the battery housing 111 through the protective plate 330. A protective plate 330 can also be provided on the side of the first plate 311 facing away from the second plate 312.

[0098] Specifically, the heat exchange shell 310 may also include a support member 315, which is arranged on the surface of the second plate body 312 facing the first plate body 311. The inverse piezoelectric element 320 may include a second fixed part 324 and a vibration part 325. The second fixed part 324 is fixed to the support member 315, and the vibration part 325 is connected to the second fixed part 324 and can vibrate around the second fixed part 324 between the first plate body 311 and the second plate body 312, thereby driving the airflow from the air inlet 3101 to the air outlet 3102. In this embodiment, the structure for converting electrical energy and mechanical energy can be the second fixed part 324, which is electrically connected to the wiring harness plate 200, and the second fixed part 324 acts as a vibration source to drive the vibration part 325 to vibrate; or, the structure for converting electrical energy and mechanical energy is the vibration part 325, which is electrically connected to the wiring harness plate 200, and the vibration part 325 has both the function of energy conversion and a structure that is easy to vibrate, such as a thin film structure. At this time, the second fixed part 324 is only used for the connection between the vibration part 325 and the second plate body 312. In the technical solution of the embodiment of the present application, the inverse piezoelectric element 320 will vibrate after receiving the electric energy applied by the battery cell 110. The vibrating inverse piezoelectric element 320 can drive the external air flow through the air inlet 3101 into the space between the first plate 311 and the second plate 312, and through the through hole 3121 on the second plate 312 into the space between the second plate 312 and the third plate 313. The spacing between the bodies 313 is designed so that the airflow entering between the second plate body 312 and the third plate body 313 can form a high-pressure and high-speed airflow. The high-pressure and high-speed airflow can efficiently exchange heat with the third plate body 313, and then can efficiently exchange heat with the battery cell 110 that is thermally connected to the third plate body 313. Moreover, after the airflow flows out from the air outlet 3102 to the outside of the heat exchange shell 310, it can form an airflow with a faster flow rate on the outside of the battery cell 110, which can further effectively exchange heat with the battery cell 110.

[0099] In some embodiments, the dimension of the heat exchange housing 310 in the layout direction of the two plate surfaces 3104 is less than 4 mm. Referring to FIG. 6 , the dimension of the heat exchange housing 310 in the layout direction of the two plate surfaces 3104 can be understood as the height T of the heat exchange housing 310. The height T can be 2.8 mm, 2.9 mm, 3.0 mm, 3.5 mm, or 3.8 mm, etc.

[0100] In the technical solution of the embodiment of the present application, the size of the heat exchange shell 310 in the layout direction of the two plate surfaces 3104 is less than 4 mm, and the height T of the heat exchange shell 310 is less than the height of the common liquid plate in the related art. The volume is small, which is conducive to improving the space utilization of the battery 10.

[0101] Please refer to Figure 3. In some embodiments, the battery cell 110 includes a battery housing 111 and a pole 112. The battery housing 111 has a top wall 1111 and a bottom wall 1112 arranged opposite to each other in a first direction D1, and a side wall 1113 connected between the top wall 1111 and the bottom wall 1112. The pole 112 is arranged on the top wall 1111 and is electrically connected to the wiring harness plate 200; the bottom wall 1112 is thermally connected to at least one heat exchange housing 310, and / or the side wall 1113 is thermally connected to at least one heat exchange housing 310.

[0102] In some implementations, the bottom wall 1112 of the battery cell 110 is thermally connected to one or more heat exchange housings 310 , and the side wall 1113 of the battery cell 110 is not thermally connected to one or more heat exchange housings 310 .

[0103] In some implementations, the sidewalls 1113 of the battery cell 110 are thermally connected to one or more heat exchange housings 310 , and the bottom wall 1112 of the battery cell 110 is not thermally connected to one or more heat exchange housings 310 .

[0104] In some other implementations, the bottom wall 1112 of the battery cell 110 is thermally connected to one or more heat exchange housings 310 , and the side wall 1113 of the battery cell 110 is thermally connected to one or more heat exchange housings 310 .

[0105] In the technical solution of the embodiment of the present application, the heat exchange assembly 300 is thermally connected to the bottom wall 1112 or the side wall 1113 of the battery housing 111. The heat exchange assembly 300 does not interfere with the electrical connection between the pole 112 and the wiring harness plate 200. Furthermore, when the heat exchange assembly 300 is thermally connected to the side wall 1113 of the battery housing 111, the contact area between the heat exchange assembly 300 and the battery housing 111 can be designed to be larger, which is conducive to improving heat exchange efficiency.

[0106] Referring to Figures 2 and 3, in some embodiments, a plurality of battery cells 110 form at least one battery pack 100. The battery pack 100 includes a plurality of battery cells 110 arranged along the second direction D2. A heat exchange component 300 is provided on one or both sides of the battery pack 100 in the third direction D3. The heat exchange component 300 is thermally connected to the side walls 1113 of each battery cell 110 of the battery pack 100. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other.

[0107] The number of battery packs 100 may be one or more, and the number of heat exchange assemblies 300 may also be one or more. In some implementations, referring to FIG3 , the number of both battery packs 100 and heat exchange assembly 300 is one, and the battery pack 100 and the heat exchange assembly 300 are arranged sequentially along the third direction D3. The heat exchange assembly 300 is thermally connected to all battery cells 110 of the battery pack 100. In some implementations, the number of battery packs 100 is one, and the number of heat exchange assemblies 300 is two. The two heat exchange assemblies 300 are respectively arranged on both sides of the battery pack 100 in the third direction D3. The two heat exchange assemblies 300 are thermally connected to all battery cells 110 of the battery pack 100. In some implementations, referring to FIG2 , the number of battery packs 100 is multiple, the number of heat exchange assemblies 300 is two more than the number of battery packs 100, and the multiple heat exchange assemblies 300 and the multiple battery packs 100 are arranged alternately along the third direction D3. In some implementations, there are multiple battery packs 100, and the multiple battery packs 100 are arranged in sequence along the third direction D3. Some battery packs 100 are provided with heat exchange components 300 on one side or both sides of the third direction D1, and some battery packs 100 are not provided with heat exchange components 300 on both sides of the third direction D1. There is no special restriction in this application.

[0108] In the technical solution of the embodiment of the present application, the heat exchange component 300 exchanges heat with all the battery cells 110 of the battery pack 100 by heat conduction, which has high heat exchange efficiency and can keep the temperature of each battery cell 110 in the battery pack 100 as consistent as possible.

[0109] 2 and 3 , in some embodiments, the air inlet 3101 is disposed on a side of the heat exchange housing 310 in the first direction D1 near the bottom wall 1112, and the air outlet 3102 is disposed on a side of the heat exchange housing 310 in the first direction D1 near the top wall 1111. The dotted arrows in FIG2 and 3 indicate the direction of airflow.

[0110] In the technical solution of the embodiment of the present application, the dimensions of the air inlet 3101 and the air outlet 3102 in the second direction D2 can be set to be equal to or close to the dimensions of the battery pack 100 in the second direction D2. The airflow discharged from the heat exchange component 300 will flow to the pole 112 of each battery cell 110 of the battery pack 100. The airflow discharged from the heat exchange component 300 can dissipate heat or heat the electrical connection between the pole 112 and the wiring harness plate 200, thereby maintaining the temperature of the electrical connection between the pole 112 and the wiring harness plate 200 within an appropriate range, thereby improving the safety performance of the battery 10.

[0111] Referring to Figures 2 and 3 , in some embodiments, there are multiple battery packs 100 and multiple heat exchange assemblies 300, with the multiple heat exchange assemblies 300 and multiple battery packs 100 being alternately arranged along a third direction D3. It will be appreciated that each heat exchange assembly 300 is thermally connected to the sidewalls 1113 of each battery cell 110 of an adjacent battery pack 100.

[0112] In the technical solution of the embodiment of the present application, the heat exchange components 300 and the battery packs 100 are alternately arranged, and multiple heat exchange components 300 can exchange heat with multiple battery packs 100 respectively, which can make the temperature of the multiple battery packs 100 more uniform and avoid the formation of local high or low temperatures as much as possible.

[0113] Please refer to Figure 2. In some embodiments, the battery 10 also includes two busbars 400; the two busbars 400 extend along the third direction D3 and are arranged on one side or both sides of the multiple battery packs 100 in the second direction D2. The two busbars 400 are used to electrically connect each inverse piezoelectric element 320 to the wiring harness board 200.

[0114] It is understood that the positive electrode and negative electrode of the inverse piezoelectric element 320 can be electrically connected to the wiring harness plate 200 via the first electrical connector 340 and the second electrical connector 350, respectively. In some implementations, referring to FIG. 2 , when the first electrical connector 340 and the second electrical connector 350 are respectively connected to both sides of the inverse piezoelectric element 320 in the second direction D2, in this case, two busbars 400 can be respectively disposed on both sides of the plurality of battery packs 100 in the second direction D2, thereby facilitating electrical connection between the first electrical connector 340 and the second electrical connector 350 and the two busbars 400, respectively. In some other implementations, when the first electrical connector 340 and the second electrical connector 350 are connected to the same side of the inverse piezoelectric element 320 in the second direction D2, in this case, the two busbars 400 can be respectively arranged on the same side of the multiple battery packs 100 in the second direction D2, so that the first electrical connector 340 and the second electrical connector 350 can be electrically connected to the two busbars 400 respectively.

[0115] In the technical solution of the embodiment of the present application, two busbars 400 are provided, both of which extend along the third direction D3, and the two busbars 400 are arranged on one side or both sides of multiple battery packs 100 and multiple heat exchange components 300 in the second direction D2, which can simplify the routing between the inverse piezoelectric element 320 and the wiring harness plate 200.

[0116] Referring to FIG. 2 and FIG. 3 , in some embodiments, the second direction D2 is the length direction of the battery cell 110 , and the third direction D3 is the width direction of the battery cell 110 .

[0117] In the technical solution of the embodiment of the present application, the heat exchange component 300 is thermally connected to the side of the battery cell 110 with a larger area. The contact area between the heat exchange component 300 and the battery cell 110 is large, which is conducive to sufficient heat exchange between the heat exchange component 300 and the battery cell 110 and improves the heat exchange efficiency.

[0118] Please refer to Figures 10 to 12. In some embodiments, multiple battery cells 110 form multiple battery modules. The battery modules include multiple battery cells 110 arranged in an array. There are multiple heat exchange components 300. The multiple heat exchange components 300 are respectively arranged on one side of the multiple battery modules close to the bottom wall 1112 in the first direction D1. Each heat exchange component 300 is thermally connected to the bottom wall 1112 of at least part of the battery cells 110 of the corresponding battery module.

[0119] In the technical solution of the embodiment of the present application, multiple heat exchange components 300 and multiple battery modules exchange heat through heat conduction respectively. The heat exchange efficiency between the heat exchange components 300 and the battery modules is high, and the temperatures of the multiple battery modules can be kept as consistent as possible.

[0120] In some embodiments, multiple battery modules are arranged in a rectangular array along the second direction D2 and the third direction D3, with the second direction D2, the third direction D3, and the first direction D1 being perpendicular to each other. The heat exchange assembly 300 has a smaller dimension in the second direction D2 than the battery modules, and the air inlet 3101 and the air outlet 3102 are located on either side of the heat exchange housing 310 in the third direction D3.

[0121] In the technical solution of the embodiment of the present application, the size of the heat exchange shell 310 in the second direction D2 is smaller than the size of the battery module in the second direction D2, so some battery cells 110 of the battery module are directly thermally connected to the heat exchange shell 310, while other battery cells 110 are not directly thermally connected to the heat exchange shell 310. For the battery cells 110 that are directly thermally connected to the heat exchange shell 310, this part of the battery cells 110 exchanges heat with the heat exchange shell 310 through heat conduction. For the battery cells 110 that are not directly thermally connected to the heat exchange shell 310, since the air inlet 3101 and the air outlet 3102 are respectively arranged on both sides of the heat exchange shell 310 in the third direction D3, the airflow generated by the heat exchange component 300 can cover the part of the battery cells 110 that are not directly thermally connected to the heat exchange shell 310. The heat exchange component 300 can exchange heat with all the battery cells 110 of the battery module, and the size of the heat exchange component 300 in the second direction D2 is relatively small, and the installation space required for the heat exchange component 300 is small, which is conducive to improving the space utilization of the battery 10.

[0122] Referring to Figures 10 to 12 , in some embodiments, multiple battery modules are arranged in a rectangular array along the second direction D2 and the third direction D3, with the second direction D2, the third direction D3, and the first direction D1 being perpendicular to each other. The dimensions of the heat exchange assembly 300 in the third direction D3 are smaller than those of the battery modules in the third direction D3. The air inlet 3101 and the air outlet 3102 are located on either side of the heat exchange housing 310 in the second direction D2. The dashed arrows in Figure 10 indicate the direction of airflow.

[0123] In the technical solution of the embodiment of the present application, the size of the heat exchange shell 310 in the third direction D3 is smaller than the size of the battery module in the third direction D3, so some battery cells 110 of the battery module are directly thermally connected to the heat exchange shell 310, while other battery cells 110 are not directly thermally connected to the heat exchange shell 310. For the battery cells 110 that are directly thermally connected to the heat exchange shell 310, this part of the battery cells 110 exchanges heat with the heat exchange shell 310 through heat conduction. For the battery cells 110 that are not directly thermally connected to the heat exchange shell 310, since the air inlet 3101 and the air outlet 3102 are respectively arranged on both sides of the heat exchange shell 310 in the second direction D2, the airflow generated by the heat exchange component 300 can cover the part of the battery cells 110 that are not directly thermally connected to the heat exchange shell 310. The heat exchange component 300 can exchange heat with all the battery cells 110 of the battery module, and the size of the heat exchange component 300 in the third direction D3 is small, and the installation space required for the heat exchange component 300 is small, which is conducive to improving the space utilization of the battery 10.

[0124] Please refer to Figures 10 and 12. In some embodiments, there are multiple wiring harness plates 200, and the multiple wiring harness plates 200 are respectively arranged on one side of the multiple battery modules close to the pole 112 in the first direction D1. The multiple wiring harness plates 200 are respectively electrically connected to the pole 112 of the multiple battery modules, and the multiple wiring harness plates 200 are respectively electrically connected to the multiple inverse piezoelectric elements 320.

[0125] In the technical solution of the embodiment of the present application, multiple wiring harness plates 200 are respectively arranged on one side of multiple battery modules close to the pole 112 in the first direction D1, which can simplify the routing between the wiring harness plates 200 and the corresponding inverse piezoelectric elements 320 and the corresponding battery modules.

[0126] Referring to Figures 10 to 12, in some embodiments, the battery 10 further includes a box body 500, which has a receiving cavity 510 for receiving the battery cell 110, the wiring harness plate 200 and the heat exchange assembly 300. The box body 500 is also provided with an intake valve (not shown in the figure, the same below) and an exhaust valve (not shown in the figure, the same below) respectively connected to the receiving cavity 510.

[0127] In the technical solution of the embodiment of the present application, the box body 500 can protect the battery cell 110, the wiring harness plate 200 and the heat exchange assembly 300. The intake valve and the exhaust valve can control the flow of air inside and outside the box body 500, thereby keeping the air pressure inside and outside the box body 500 balanced, and also enabling the heat exchange assembly 300 to achieve a higher heat exchange efficiency.

[0128] In some embodiments, the battery 10 also includes a temperature regulating element (not shown in the figure, the same below) and a temperature sensor (not shown in the figure, the same below) both of which are arranged in the accommodating cavity 510 and electrically connected to the wiring harness plate 200 respectively. The temperature regulating element is configured to cool when the temperature value measured by the temperature sensor is greater than a first predetermined value, and to heat when the temperature value measured by the temperature sensor is less than a second predetermined value, and the second predetermined value is less than the first predetermined value.

[0129] Specifically, the first predetermined value may be set to 45°C to 60°C, and the second predetermined value may be set to -20°C to -10°C.

[0130] In the technical solution of the embodiment of the present application, the temperature regulating element will cool when the temperature in the accommodating cavity 510 is greater than a first predetermined value, so that the heat exchange component 300 can cool the battery cell 110 when driving the air flow, and the temperature regulating element will heat when the temperature in the accommodating cavity 510 is less than a second predetermined value, so that the heat exchange component 300 can heat or keep the battery cell 110 warm when driving the air flow, which can effectively regulate the temperature of the battery cell 110.

[0131] Please refer to FIG. 1 . An embodiment of the present application provides an electrical device, which includes the battery 10 described above.

[0132] In the technical solution of the embodiment of the present application, the electrical device includes the above-mentioned battery 10, so that the electrical device also has the technical effects corresponding to the above-mentioned battery 10, which will not be repeated here.

[0133] 1 to 9 , in some embodiments, a battery 10 includes a plurality of battery cells 110 , a plurality of heat exchange assemblies 300 , a wiring harness plate 200 , two manifolds 400 , a housing 500 , an intake valve, an exhaust valve, a temperature sensor, and a temperature regulating element.

[0134] The box body 500 has a accommodating cavity 510, in which multiple battery cells 110, multiple heat exchange components 300, a wiring harness plate 200, two manifolds 400, a temperature sensor and a temperature regulating element are all accommodated. The air intake valve and the exhaust valve are both arranged on the box body 500 and are interconnected with the accommodating cavity 510.

[0135] Each battery cell 110 includes a battery housing 111 and a terminal 112. The battery housing 111 has a top wall 1111 and a bottom wall 1112 that are opposite each other in a first direction D1, and a side wall 1113 connected between the top wall 1111 and the bottom wall 1112. The terminal 112 is disposed on the top wall 1111 and is electrically connected to the wiring harness plate 200. Multiple battery cells 110 form multiple battery packs 100, each of which includes multiple battery cells 110 arranged along a second direction D2.

[0136] Multiple heat exchange assemblies 300 and multiple battery packs 100 are arranged alternately in the third direction D3. The heat exchange assemblies 300 are thermally connected to the sidewalls 1113 of each battery cell 110 of the adjacent battery pack 100. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other. The second direction D2 is the length of the battery cell 110, and the third direction D3 is the width of the battery cell 110. The air inlet 3101 and the air outlet 3102 of each heat exchange housing 310 are respectively provided on both sides of the heat exchange housing 310 in the first direction D1.

[0137] The two busbars 400 extend along the third direction D3 and are disposed on one side or both sides of the battery packs 100 in the second direction D2 . The two busbars 400 are used to electrically connect each inverse piezoelectric element 320 to the wiring harness plate 200 .

[0138] The temperature adjustment element is configured to cool when the temperature value measured by the temperature sensor is greater than a first predetermined value, and to heat when the temperature value measured by the temperature sensor is less than a second predetermined value, the second predetermined value being less than the first predetermined value.

[0139] 4 to 11 , in some embodiments, the battery 10 includes a plurality of battery cells 110 , a plurality of heat exchange assemblies 300 , a plurality of wiring harness plates 200 , a housing 500 , an intake valve, an exhaust valve, a temperature sensor, and a temperature regulating element.

[0140] The box body 500 has a accommodating cavity 510, in which multiple battery cells 110, multiple heat exchange components 300, multiple wiring harness plates 200, temperature sensors and temperature adjustment elements are all accommodated. The intake valve and exhaust valve are both arranged on the box body 500 and are interconnected with the accommodating cavity 510.

[0141] Each battery cell 110 includes a battery housing 111 and a pole 112. The battery housing 111 has a top wall 1111 and a bottom wall 1112 arranged opposite to each other in the first direction D1, and a side wall 1113 connected between the top wall 1111 and the bottom wall 1112. The pole 112 is arranged on the top wall 1111 and is electrically connected to the wiring harness plate 200.

[0142] The battery cells 110 form a plurality of battery modules, each of which includes a plurality of battery cells 110 arranged in an array along the second direction D2 and the third direction D3. The battery modules are arranged in an array along the second direction D2 and the third direction D3, with the first direction D1, the second direction D2, and the third direction D3 being perpendicular to each other.

[0143] The plurality of harness plates 200 are respectively disposed on one side of the plurality of battery modules where the poles 112 are disposed.

[0144] The multiple heat exchange assemblies 300 are thermally connected to the sides of the multiple battery modules facing away from the poles 112, and the multiple inverse piezoelectric elements 320 are electrically connected to the multiple wiring harness plates 200. The air inlet 3101 and air outlet 3102 of the heat exchange housing 310 are respectively provided on both sides of the heat exchange housing 310 in the second direction D2.

[0145] The temperature adjustment element is configured to cool when the temperature value measured by the temperature sensor is greater than a first predetermined value, and to heat when the temperature value measured by the temperature sensor is less than a second predetermined value, the second predetermined value being less than the first predetermined value.

[0146] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: The battery comprises: Multiple battery cells; a wiring harness plate, electrically connected to each of the battery cells; The heat exchange assembly includes a heat exchange shell and an inverse piezoelectric element. The heat exchange shell is thermally connected to at least part of the battery cells and has an air inlet, an air flow channel and an air outlet that are connected in sequence. The inverse piezoelectric element is arranged in the air flow channel and is electrically connected to the wiring harness plate. The inverse piezoelectric element is configured to vibrate under the voltage applied by the battery cells to drive external air flow from the air inlet into the air flow channel and discharged from the air outlet.

2. The battery according to claim 1, characterized in that The heat exchange housing is a plate-shaped structure having two plate surfaces arranged opposite to each other, and the heat exchange housing is thermally connected to the battery cells through the plate surfaces.

3. The battery according to claim 2, characterized in that The heat exchange assembly further includes a protection plate, which is provided on at least one of the plate surfaces of the heat exchange shell, with a gap being provided between the plate surface and the protection plate.

4. The battery according to claim 3, characterized in that The air inlet and / or the air outlet are arranged on the plate surface and located in the area corresponding to the gap. An opening communicating with the gap is also formed between the protection plate and the plate surface.

5. The battery according to claim 4, characterized in that The air inlet and the air outlet are respectively arranged on two oppositely arranged plate surfaces.

6. The battery according to claim 2, characterized in that One side edge of the two oppositely disposed plate surfaces defines the air inlet, and the other side edge of the two oppositely disposed plate surfaces defines the air outlet.

7. The battery according to claim 2, characterized in that The heat exchange housing includes a side edge arranged between the edges of the two plate surfaces, and the air inlet and / or the air outlet is arranged on the side edge.

8. The battery according to claim 1, characterized in that The heat exchange shell includes a first plate, a second plate and a third plate arranged in sequence and a side plate arranged around the outside of the first plate, the second plate and the third plate. The inverse piezoelectric element is arranged between the first plate and the second plate. The second plate is provided with a plurality of through holes. The third plate is thermally connected to the battery cell. The air inlet is provided on the first plate, and the air outlet is provided on the portion of the side plate corresponding to the portion between the second plate and the third plate.

9. The battery according to claim 2, characterized in that The dimension of the heat exchange shell in the layout direction of the two plate surfaces is less than 4 mm.

10. The battery according to any one of claims 1 to 9, characterized in that: The battery cell includes a battery shell and a pole, the battery shell has a top wall and a bottom wall arranged opposite to each other in a first direction, and a side wall connected between the top wall and the bottom wall, the pole is arranged on the top wall and electrically connected to the wiring harness plate; the bottom wall is thermally connected to at least one of the heat exchange shells, and / or the side wall is thermally connected to at least one of the heat exchange shells.

11. The battery according to claim 10, characterized in that A plurality of the battery cells form at least one battery pack, and the battery pack includes a plurality of the battery cells arranged along the second direction. The heat exchange component is provided on one or both sides of the third direction of the battery pack. The heat exchange component is thermally connected to the side walls of each of the battery cells in the battery pack, and the first direction, the second direction and the third direction are perpendicular to each other.

12. The battery according to claim 11, characterized in that The air inlet is provided on a side of the heat exchange shell close to the bottom wall in the first direction, and the air outlet is provided on a side of the heat exchange shell close to the top wall in the first direction.

13. The battery according to claim 11, characterized in that There are multiple battery packs and multiple heat exchange components, and the multiple heat exchange components and the multiple battery packs are alternately arranged along the third direction.

14. The battery according to claim 13, characterized in that The battery also includes two busbars, both of which extend along the third direction and are arranged on one side or both sides of the multiple battery packs and the multiple heat exchange components in the second direction. The two busbars are used to electrically connect each of the inverse piezoelectric elements to the wiring harness plate.

15. The battery according to claim 10, characterized in that Multiple battery cells form multiple battery modules, and the battery modules include multiple battery cells arranged in an array. The number of the heat exchange components is multiple, and the multiple heat exchange components are respectively arranged on one side of the multiple battery modules close to the bottom wall in the first direction. Each heat exchange component is thermally connected to the bottom wall of at least part of the battery cells of the corresponding battery module.

16. The battery according to claim 15, characterized in that The plurality of battery modules are arranged in a rectangular array along the second direction and the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The size of the heat exchange assembly in the second direction is smaller than the size of the battery module in the second direction, and the air inlet and the air outlet are respectively provided on both sides of the heat exchange housing in the third direction; Alternatively, the size of the heat exchange assembly in the third direction is smaller than the size of the battery module in the third direction, and the air inlet and the air outlet are respectively provided on both sides of the heat exchange housing in the second direction.

17. The battery according to claim 15, characterized in that There are multiple wiring harness plates, and the multiple wiring harness plates are respectively arranged on one side of the multiple battery modules close to the pole in the first direction. The multiple wiring harness plates are respectively electrically connected to the poles of the multiple battery modules, and the multiple wiring harness plates are respectively electrically connected to the multiple inverse piezoelectric elements.

18. The battery according to any one of claims 1 to 17, characterized in that: The battery further comprises a box having a housing for accommodating the battery cell, the wiring harness plate and the heat exchange assembly. The box is further provided with an intake valve and an exhaust valve respectively connected to the housing cavity.

19. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 18.

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