Battery device, electric equipment and battery box body

Abstract

The utility model provides a battery device, electric equipment and a battery box body. The battery device includes: a plurality of battery cells; the battery box body is provided with an accommodating cavity, and the plurality of battery monomers are arranged in the accommodating cavity; the battery box body comprises a heat exchange plate, and the heat exchange plate is provided with a liquid inlet, a liquid outlet and a plurality of heat exchange runners; the two ends of each heat exchange runner are directly communicated with the liquid inlet and the liquid outlet respectively; each heat exchange flow channel comprises at least one branch flow channel arranged at intervals in the first direction, and each branch flow channel extends to the second side edge of the heat exchange plate from the first side edge of the heat exchange plate in the second direction intersecting with the first direction. At least part of the area, in the first direction, of the heat exchange plate comprises a plurality of hot runner areas and cold runner areas which are alternately distributed in the first direction. The hot runner area and the cold runner area each comprise at least one branch runner. According to the battery device, the flow resistance of the flow channel is reduced, and the temperature uniformity of each battery monomer in the battery box body is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery device, an electrical equipment and a battery box body. Background Art

[0002] A battery device may include a plurality of battery cells and a battery box body. The plurality of battery cells are arranged in the battery box body. The battery box body has a flow channel for heat exchange of the plurality of battery cells. However, for the existing battery device, the flow resistance of the flow channel is large, and the temperature uniformity of each battery cell in the battery box body is poor. Summary of the Utility Model

[0003] The battery device, the electrical equipment and the battery box body provided by this application aim to solve the problems that for the existing battery box body, the flow resistance of the flow channel is large, and the temperature uniformity of each battery cell in the battery box body is poor.

[0004] To solve the above technical problems, a technical solution adopted by this application is: to provide a battery device. The battery device includes:

[0005] A plurality of battery cells;

[0006] A battery box body having an accommodation cavity, and the plurality of battery cells are arranged in the accommodation cavity; the battery box body includes a heat exchange plate, and the heat exchange plate has a liquid inlet, a liquid outlet and a plurality of heat exchange channels; both ends of each heat exchange channel are directly communicated with the liquid inlet and the liquid outlet respectively; and each heat exchange channel includes at least one branch channel arranged at intervals in a first direction, and each branch channel extends from a first side edge of the heat exchange plate to a second side edge of the heat exchange plate along a second direction intersecting the first direction.

[0007] Wherein, at least a part of the heat exchange plate in the first direction includes a plurality of heat flow channel areas and cold flow channel areas alternately distributed in the first direction; the heat flow channel areas and the cold flow channel areas respectively include at least one branch channel.

[0008] In the above battery device, by providing a plurality of heat exchange channels directly communicating with the liquid inlet and the liquid outlet on the heat exchange plate, each heat exchange channel includes at least one branch channel spaced along a first direction. In this way, the heat exchange medium entering from the liquid inlet will enter each heat exchange channel respectively, and the temperature of the heat exchange medium in each heat exchange channel is basically the same. This can make the temperature of the part of each branch channel in the heat flow channel area basically consistent, and make the temperature uniformity of each heat flow channel area of the heat exchange plate better. At the same time, the battery device makes at least a part of the area of the heat exchange plate along the first direction include a plurality of heat flow channel areas and cold flow channel areas alternately distributed along the first direction; the heat flow channel areas and the cold flow channel areas each include at least one branch channel. In this way, the heat exchange medium with a higher temperature can flow through the branch channels in the heat flow channel area, and the heat exchange medium with a lower temperature can flow through the branch channels in the cold flow channel area, so that at least a part of the area of the heat exchange plate along the first direction includes a plurality of areas with alternating hot and cold distributions, and the temperature uniformity of at least a part of the area of the heat exchange plate along the first direction is better realized, effectively improving the temperature uniformity of each battery cell in the battery box. In addition, by making each branch channel extend from the first side edge of the heat exchange plate to the second side edge of the heat exchange plate along a second direction intersecting the first direction, the bypass times of each heat exchange channel are reduced, the impact on the heat exchange medium in the heat exchange plate is reduced, and thus the flow resistance of the heat exchange plate is effectively reduced; moreover, the design of the entire flow channel is simpler, facilitating the processing and manufacturing of each branch channel.

[0009] In one embodiment, among some adjacent two heat flow channel areas and cold flow channel areas, at least one branch channel in the heat flow channel area is the upstream part of a heat exchange channel along its flow path; at least one branch channel in the cold flow channel area is the downstream part of the same heat exchange channel along its flow path; and / or

[0010] Among some adjacent two heat flow channel areas and cold flow channel areas, at least one branch channel in the heat flow channel area is the upstream part of one of the plurality of heat exchange channels along its flow path; at least one branch channel in the cold flow channel area is the downstream part of another one of the plurality of heat exchange channels along its flow path.

[0011] In the above solution, by arranging the upstream part of the same heat exchange flow channel in the hot flow channel area and the downstream part in the cold flow channel area, the heat exchange medium flowing through the same heat exchange flow channel can achieve the hot and cold alternation of the heat exchange plate in the first direction as the temperature changes during the flow process. This not only helps to achieve the uniform temperature of the heat exchange plate in the first direction, but also has a relatively simple design method for the heat exchange flow channel and low cost. And / or by arranging the upstream part of one heat exchange flow channel in the hot flow channel area and the downstream part of another heat exchange flow channel in the cold flow channel area, the heat exchange medium flowing through different heat exchange flow channels can achieve the hot and cold alternation of the heat exchange plate in the first direction. This not only helps to achieve the uniform temperature of the heat exchange plate in the first direction, but also compared with the solution where the same heat exchange flow channel is distributed in both the hot flow channel area and the cold flow channel area at the same time, the winding times of the heat exchange flow channel can be reduced, so as to reduce the number of branch channels in the heat exchange flow channel, thereby effectively shortening the total length of the heat exchange flow channel and reducing the flow resistance of the corresponding heat exchange flow channel.

[0012] In one embodiment, at least one battery cell is correspondingly arranged for each adjacent hot flow channel area and cold flow channel area.

[0013] In this way, the uniform heat exchange of each battery cell distributed in the first direction can be achieved through the heat exchange plate with hot and cold alternating distribution, so that the temperatures of each battery cell distributed in the first direction are basically the same; in addition, since each branch channel extends from the first side of the heat exchange plate to the second side of the heat exchange plate along the second direction respectively, the temperatures of each battery cell distributed in the second direction are also basically kept the same, effectively improving the uniform temperature of each battery cell in the battery box.

[0014] In one embodiment, the heat exchange plate has a hot flow channel area, a cold flow channel area and an outlet liquid flow channel area in the first direction; each heat exchange flow channel includes at least one inlet liquid branch channel and at least one outlet liquid branch channel; the inlet liquid branch channels of all heat exchange flow channels are arranged in the hot flow channel area or in the hot flow channel area and the cold flow channel area; the outlet liquid branch channels of all heat exchange flow channels are arranged in the outlet liquid flow channel area; wherein, along the direction towards the outlet liquid flow channel area in the first direction, the number of branch channels of each heat exchange flow channel gradually increases.

[0015] In the above solution, by making the number of branch channels of each heat exchange flow channel gradually increase along the direction towards the outlet liquid flow channel area in the first direction, the entire path lengths of the heat exchange flow channels at different regional positions of the heat exchange plate can be basically the same. When the diameters of each branch channel are the same, the flow rates in each heat exchange flow channel can be basically kept the same, which is beneficial to achieving the uniform temperature of the battery cells in different regions within the battery box.

[0016] In one embodiment, the heat exchange plate has a hot runner region, a cold runner region, and an outlet runner region along a first direction; each heat exchange runner includes at least one inlet branch runner and at least one outlet branch runner; the inlet branch runners of all the heat exchange runners are provided in the hot runner region, or in the hot runner region and the cold runner region; the outlet branch runners of all the heat exchange runners are provided in the outlet runner region; the distribution density of the outlet branch runners in the outlet runner region is greater than the distribution density of the inlet branch runners in the hot runner region and greater than the distribution density of the inlet branch runners in the cold runner region.

[0017] In the above solution, by increasing the distribution density of the outlet branch runners, more heat exchange medium flows through the outlet runner region, so as to increase the temperature of the outlet runner region, reduce the temperature difference between the outlet runner region and other regions, and is beneficial to improving the temperature uniformity of the battery cells in each region of the battery device.

[0018] In one embodiment, each branch runner on the heat exchange plate is a straight runner.

[0019] In the above solution, compared with a curved runner, the straight runner can further reduce the impact on the heat exchange medium in the heat exchange runner, thereby further reducing the flow resistance of the heat exchange plate. Moreover, the straight runner is convenient for processing and preparation, with a simple process and low cost.

[0020] In one embodiment, the heat exchange plate has a hot runner region, a cold runner region, and an outlet runner region along a first direction; each heat exchange runner includes at least one inlet branch runner and at least one outlet branch runner; the inlet branch runners of all the heat exchange runners are provided in the hot runner region, or in the hot runner region and the cold runner region; the outlet branch runners of all the heat exchange runners are provided in the outlet runner region; wherein, the outlet runner region is located at the first side edge of the heat exchange plate along the first direction; the hot runner region and the cold runner region are located in other regions of the heat exchange plate along the first direction.

[0021] In the above solution, by arranging the outlet branch runners of each heat exchange runner around one side edge of the heat exchange plate and arranging the inlet branch runners of each heat exchange runner in other regions of the heat exchange plate, the requirements for different distribution positions of the inlet and outlet ports on the heat exchange plate can be met, and the compatibility is better.

[0022] In one embodiment, the heat exchange plate has a hot runner region, a cold runner region, and an outlet runner region along a first direction; each heat exchange runner includes at least one inlet branch runner and at least one outlet branch runner; the inlet branch runners of all the heat exchange runners are provided in the hot runner region, or in the hot runner region and the cold runner region; the outlet branch runners of all the heat exchange runners are provided in the outlet runner region; wherein, the outlet runner region is located in the middle region of the heat exchange plate along the first direction; the hot runner region and the cold runner region are distributed on both sides of the outlet runner region along the first direction, and each side of the outlet runner region has a plurality of hot runner regions and a plurality of cold runner regions alternately distributed.

[0023] In the above solution, the liquid outlet branch channels of each heat exchange channel are arranged in the middle area of the heat exchange plate to form a liquid outlet channel area; the liquid inlet branch channels of each heat exchange channel are distributed on both sides of the liquid outlet channel area, so that cold and hot alternating areas are formed on both sides of the liquid outlet channel area, and each side has a plurality of alternately distributed hot channel areas and cold channel areas, which can make the temperatures of the two side edges of the heat exchange plate along the first direction basically the same, thereby reducing the temperature difference value between the two side edges of the heat exchange plate along the first direction, and further improving the temperature uniformity of each battery cell arranged on the heat exchange plate.

[0024] In one embodiment, with the central axis along which the liquid inlet extends in the second direction as the axis of symmetry, a plurality of heat exchange channels are symmetrically arranged based on the axis of symmetry.

[0025] The above solution can make a plurality of heat exchange channels symmetrically distributed on the heat exchange plate along the first direction, which can reduce the temperature difference value between the two sides of the heat exchange plate along the axis of symmetry, and further improve the temperature uniformity of the battery cells in the areas on both sides of the axis of symmetry of the heat exchange plate. Moreover, compared with the solution in which the upstream part of a heat exchange channel is located on one side of the heat exchange plate along the axis of symmetry and the downstream part of the heat exchange channel is located on the other side of the heat exchange plate, the path of the heat exchange channel is effectively shortened, and the temperature difference value between the upstream part and the downstream part of each heat exchange channel is small, so that the temperature uniformity of each area of the heat exchange plate along the first direction can be further improved, and further the temperature uniformity of the battery cells arranged in each area of the heat exchange plate can be improved.

[0026] To solve the above technical problems, another technical solution adopted by the present application is: to provide an electrical device, which includes the battery device involved above.

[0027] To solve the above technical problems, another technical solution adopted by the present application is: to provide a battery box, which includes: a heat exchange plate; the heat exchange plate has a liquid inlet, a liquid outlet and a plurality of heat exchange channels; both ends of each heat exchange channel are directly communicated with the liquid inlet and the liquid outlet respectively; and each heat exchange channel includes at least one branch channel arranged at intervals along the first direction, and each branch channel extends from the first side edge of the heat exchange plate to the second side edge of the heat exchange plate along the second direction intersecting with the first direction;

[0028] Wherein, at least part of the area of the heat exchange plate along the first direction includes a plurality of alternately distributed hot channel areas and cold channel areas along the first direction; the hot channel areas and the cold channel areas respectively include at least one branch channel.

[0029] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 is a schematic structural diagram of the electrical device provided by the present application;

[0032] Figure 2 is a schematic structural diagram of the battery device provided by some embodiments of the present application;

[0033] Figure 3 is a schematic layout diagram of a plurality of heat exchange channels on the heat exchange plate provided by an embodiment of the present application;

[0034] Figure 4 is for the high-temperature heat exchange medium flowing through provided by an embodiment of the present application Figure 3 the temperature change diagram of the plurality of heat exchange channels shown;

[0035] Figure 5 is a schematic layout diagram of two heat exchange channels provided on the heat exchange plate by an embodiment of the present application;

[0036] Figure 6 is a schematic layout diagram of a plurality of heat exchange channels on the heat exchange plate provided by another embodiment of the present application;

[0037] Figure 7 is for the high-temperature heat exchange medium flowing through provided by an embodiment of the present application Figure 6 the temperature change diagram of the plurality of heat exchange channels shown.

[0038] Explanation of reference numerals:

[0039] 100 electrical device; 200 battery device; 10 battery cell; 20 battery box; 20a upper housing; 20b lower housing; 21 heat exchange plate; m first side; n second side; 21a heat flow channel area; 21b cold flow channel area; 21c liquid outlet flow channel area; 211 liquid inlet; 212 liquid outlet; 213 heat exchange channel; 214 branch channel; 215 liquid inlet branch channel; 216 liquid outlet branch channel. Detailed embodiments

[0040] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0043] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0045] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0048] In the related art, a battery device can be a device that includes a battery box body and a plurality of battery cells disposed in the battery box body to provide higher voltage and capacity. Among them, the plurality of battery cells can be connected in series, parallel, or in a hybrid connection through a busbar component. The hybrid connection means that there are both series and parallel connections among the plurality of battery cells. In some cases, the battery cell has a cubic structure with a length, a width, and a height, and the length of the battery cell is greater than the width of the battery cell, and the height of the battery cell is greater than the width of the battery cell.

[0049] To protect the functions, lifespan, performance, etc. of the battery cells, it is required that the battery box body has the ability of thermal management such as cooling and heating the battery cells. However, the area where the flow channel on the battery box body has a flow-around will increase the flow resistance of the heat exchange plate, which not only makes it difficult to meet the flow resistance index proposed by customers, resulting in customers being unable to choose a cheaper heat exchange unit, increasing the vehicle cost, and being unfavorable to the current cost reduction environment; moreover, it is time-consuming and laborious to draw the flow channel. And the temperature uniformity of the battery cells in each area inside the battery box body is poor.

[0050] Based on this, the embodiments of the present application provide a battery device. By arranging a plurality of heat exchange channels directly communicating with the liquid inlet and the liquid outlet on the heat exchange plate, each heat exchange channel includes at least one branch channel arranged at intervals in the first direction. In this way, the heat exchange medium entering from the liquid inlet will enter each heat exchange channel respectively, and the temperature of the heat exchange medium in each heat exchange channel is basically the same. This can make the temperatures of the parts of each branch channel in the heat flow channel area basically consistent, and make the temperature uniformity of each heat flow channel area of the heat exchange plate better. At the same time, the battery device makes at least a part of the area of the heat exchange plate in the first direction include a plurality of heat flow channel areas and cold flow channel areas alternately distributed in the first direction; the heat flow channel areas and the cold flow channel areas each include at least one branch channel. In this way, the heat exchange medium with a higher temperature can flow through the branch channels in the heat flow channel area, and the heat exchange medium with a lower temperature can flow through the branch channels in the cold flow channel area, so that at least a part of the area of the heat exchange plate in the first direction includes a plurality of areas with alternating hot and cold distributions, better realizing the temperature uniformity of at least a part of the area of the heat exchange plate in the first direction, and effectively improving the temperature uniformity of each battery cell in the battery box. In addition, by making each branch channel extend from the first side of the heat exchange plate to the second side of the heat exchange plate in the second direction intersecting the first direction, the number of bypasses of each heat exchange channel is reduced, the impact on the heat exchange medium in the heat exchange plate is reduced, and thus the flow resistance of the heat exchange plate is effectively reduced; and the design of the entire flow channel is simpler, facilitating the processing and manufacturing of each branch channel.

[0051] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0052] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the electrical device provided by the present application. In one embodiment, an electrical device is provided. The electrical device includes an electrical component 100 and a battery device 200, and the battery device 200 is electrically connected to the electrical component 100. The battery device 200 is used to provide electrical energy for the electrical device, so that the electrical component 100 can work.

[0053] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and 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, and 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 grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc.

[0054] For the convenience of description, the following embodiments are described by taking the electrical device as a vehicle as an example.

[0055] The electrical component 100 can be an element or device that can use electricity; the electrical component 100 can be a controller and electronic components, etc., and the controller can be a central processing unit (Central Processing Unit, abbreviated as CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0056] In some examples, the electrical device can be a vehicle, and the electrical component 100 can be a vehicle lamp (such as a headlamp, a rear lamp, etc.), a display screen, an instrument panel, a control system (such as a controller), etc. The vehicle can also include a vehicle frame, and both the battery device 200 and the electrical component 100 are installed on the vehicle body.

[0057] See Figures 2 to 4 , Figure 2 is a schematic structural diagram of the battery device 200 provided by some embodiments of the present application; Figure 3 is a schematic layout diagram of a plurality of heat exchange channels on the heat exchange plate provided by an embodiment of the present application; Figure 4 is provided by an embodiment of the present application for the high-temperature heat exchange medium to flow through Figure 3 is a schematic temperature change diagram of the plurality of heat exchange channels 213 shown; in one embodiment, the battery device 200 includes a plurality of battery cells 10 and a battery box 20. The internal space of the battery box 20 forms an accommodation cavity, and the plurality of battery cells 10 are accommodated in the accommodation cavity of the battery box 20. The battery box 20 includes a heat exchange plate 21, and the heat exchange plate 21 has a liquid inlet 211, a liquid outlet 212, and a plurality of heat exchange channels 213; both ends of each heat exchange channel 213 are directly communicated with the liquid inlet 211 and the liquid outlet 212 respectively; and each heat exchange channel 213 includes at least one branch channel 214 arranged at intervals along the first direction Y, and each branch channel 214 extends from the first side m of the heat exchange plate 21 to the second side n of the heat exchange plate 21 along the second direction X intersecting the first direction Y; wherein, at least a part of the heat exchange plate 21 along the first direction Y includes a plurality of heat flow channel regions 21a and cold flow channel regions 21b alternately distributed along the first direction Y; the heat flow channel regions 21a and the cold flow channel regions 21b respectively include at least one branch channel 214.

[0058] Among them, multiple battery cells 10 can form a component through series connection, parallel connection or hybrid connection, and then the component formed by the multiple battery cells 10 is directly accommodated in the accommodation cavity of the battery box 20. In some other embodiments, multiple battery cells 10 can also be first connected in series, parallel or in a hybrid manner, arranged and fixed to form a battery assembly, and the battery assembly is accommodated in the accommodation cavity of the battery box 20. In still other embodiments, multiple battery cells 10 can also be first connected in series, parallel or in a hybrid manner, arranged and fixed to form multiple battery assemblies, and the multiple battery assemblies are then connected in series, parallel or in a hybrid manner to form a whole and are accommodated in the accommodation cavity of the battery box 20.

[0059] As an example, multiple battery cells 10 can be fixed by cable ties or the like to form a battery assembly. As an example, multiple battery cells 10 can also be fixed by an end plate, a side plate or the like to form a battery assembly.

[0060] The battery cell 10 involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. Among them, the battery cell 10 can be a secondary battery or a primary battery. The battery cell 10 can be but is not limited to a metal battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The battery box 20 is a structure with an internal space.

[0061] Combined with Figure 2 , the battery box 20 includes an upper housing 20a and a lower housing 20b, and the upper housing 20a and the lower housing 20b cooperate to form an accommodation cavity. In some embodiments, the battery box 20 can be a part of the chassis structure of a vehicle. For example, a part of the battery box 20 can become at least a part of the chassis of the vehicle, or a part of the battery box 20 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0062] The heat exchange plate 21 can be used as the bottom wall of the battery box 20. The heat exchange plate 21 can be in a rectangular shape. The heat exchange plate 21 has a middle region and a first side edge and a second side edge located on both sides of the middle region along the first direction Y. Among them, the first side edge and the second side edge can be the positions of both side edges of the heat exchange plate 21 along the first direction Y. The ratio of the length dimension of the first side edge and the second side edge along the first direction Y of the heat exchange plate 21 to the total length dimension of the heat exchange plate 21 along the first direction Y is greater than 0 and less than one-half. Exemplarily, this ratio is not greater than one-third. For example, this ratio can be one-sixth, one-seventh, one-eighth or one-tenth. Among them, the region located between the first side edge and the second side edge along the first direction Y is the middle region.

[0063] The liquid inlet 211 and the liquid outlet 212 can be arranged on the same side of the heat exchange plate 21, and the external heat exchange medium enters each heat exchange channel 213 of the heat exchange plate 21 through the liquid inlet 211, and finally flows out of the heat exchange plate 21 through the liquid outlet 212. The heat exchange medium can be a coolant or a high-temperature liquid or a high-temperature gas.

[0064] The heat exchange channel 213 may be a groove body on the heat exchange plate 21. Each heat exchange channel 213 includes at least one branch channel 214 arranged at intervals along the first direction Y, and the branch channels 214 of the same heat exchange channel 213 are interconnected. It can be understood that when the heat exchange channel 213 includes a plurality of branch channels 214 connected in sequence, it is equivalent to the heat exchange channel 213 flowing back and forth on the heat exchange plate 21, so as to further exchange heat for the battery cell 10 in a reflux manner, thereby effectively improving the heat exchange efficiency of the heat exchange plate 21 for the battery cell 10.

[0065] In one example, among the multiple branch channels 214 in the same heat exchange channel 213, at least some of the branch channels 214 are connected in series in sequence. In another example, among the multiple branch channels 214 in the same heat exchange channel 213, some of the branch channels 214 are connected in series in sequence, and some of the branch channels 214 are connected to each other in parallel. In this example, some of the branch channels 214 connected in series serve as the upstream portion of the heat exchange channel 213 along its flow path, and some serve as the downstream portion of the heat exchange channel 213 along its flow path.

[0066] It should be noted that the "back and forth flow" involved in the present application refers to the flow path of the heat exchange medium. Among every three adjacent branch channels 214 arranged along the first direction Y, one end of the branch channel 214 in the middle position is connected to the upstream branch channel 214, and the other end is connected to the downstream branch channel 214, and the flow directions of the heat exchange medium in every two adjacent branch channels 214 are opposite.

[0067] The first direction Y may be perpendicular to the second direction X. The branch channel 214 extends from the first side m of the heat exchange plate 21 to the second side n of the heat exchange plate 21, specifically, the branch channel 214 extends from the position of the heat exchange plate 21 close to the first side m to the position of the heat exchange plate 21 close to its second side n; the branch channel 214 does not extend to the side wall surface of the corresponding side. Among them, the ratio of the length dimension of each branch channel 214 along the second direction X to the length dimension of the position of the heat exchange plate 21 corresponding to the branch channel 214 along the second direction X is greater than 0.5 and less than 1; illustratively, the ratio may be greater than or equal to 0.8 and less than 1, so as to reduce the number of bypasses of the heat exchange channel 213 and reduce the flow resistance.

[0068] At least a partial region of the heat exchange plate 21 along the first direction Y includes a plurality of hot runner regions 21a and a plurality of cold runner regions 21b arranged along the first direction Y. The plurality of hot runner regions 21a and the plurality of cold runner regions 21b are arranged in an alternating manner of hot runner region 21a, cold runner region 21b, hot runner region 21a, cold runner region 21b,... or in an alternating manner of cold runner region 21b, hot runner region 21a, cold runner region 21b, hot runner region 21a. In the embodiments of the present application, the alternating manner of hot runner region 21a, cold runner region 21b, hot runner region 21a, cold runner region 21b,... is taken as an example for introduction.

[0069] Among them, the temperature of the heat exchange medium in the branch flow channels 214 of the hot runner region 21a is higher than the temperature of the heat exchange medium in the cold runner region 21b. The temperature of the heat exchange medium flowing in from the liquid inlet 211 can specifically be 50°C. During the process of the heat exchange medium flowing through the heat exchange flow channel 213 to the liquid outlet 212, the temperature of the heat exchange medium gradually decreases.

[0070] Each hot runner region 21a includes at least one branch flow channel 214. When the hot runner region 21a includes a plurality of branch flow channels 214, the plurality of branch flow channels 214 can be connected in series in sequence; or can be connected to each other in parallel; or, some of the branch flow channels 214 are connected in series in sequence and some are connected to each other in parallel.

[0071] Similarly, each cold runner region 21b includes at least one branch flow channel 214. When the cold runner region 21b includes a plurality of branch flow channels 214, the plurality of branch flow channels 214 can also be connected in series in sequence; or can be connected to each other in parallel; or, some of the branch flow channels 214 are connected in series in sequence and some are connected to each other in parallel.

[0072] Among them, the number of the branch flow channels 214 in the hot runner region 21a and the cold runner region 21b can be set according to the temperature requirements of the corresponding regions; or the number of the branch flow channels 214 in the corresponding regions can be adjusted according to the temperature difference between the hot runner region 21a and the cold runner region 21b.

[0073] In this embodiment, by providing a plurality of heat exchange channels 213 on the heat exchange plate 21 that are directly communicated with the liquid inlet 211 and the liquid outlet 212, each heat exchange channel 213 includes at least one branch channel 214 arranged at intervals along the first direction Y. In this way, the heat exchange medium entering from the liquid inlet 211 will enter each heat exchange channel 213 respectively, and the temperature of the heat exchange medium in each heat exchange channel 213 is basically the same. This can make the temperature of the part of each branch channel 214 in the hot channel area 21a basically consistent, making the temperature uniformity of each hot channel area 21a of the heat exchange plate 21 better. At the same time, the battery device 200 makes at least part of the area of the heat exchange plate 21 along the first direction Y include a plurality of hot channel areas 21a and cold channel areas 21b that are alternately distributed along the first direction Y; the hot channel areas 21a and the cold channel areas 21b respectively include at least one branch channel 214. In this way, the heat exchange medium with a higher temperature can flow through the branch channels 214 of the hot channel area 21a, and the heat exchange medium with a lower temperature can flow through the branch channels 214 of the cold channel area 21b, so that at least part of the area of the heat exchange plate 21 along the first direction Y includes a plurality of areas with alternating hot and cold distributions, better realizing the temperature uniformity of at least part of the area of the heat exchange plate 21 along the first direction Y, and effectively improving the temperature uniformity of each battery cell 10 in the battery box 20. In addition, by making each branch channel 214 extend from the first side m of the heat exchange plate 21 to the second side n of the heat exchange plate 21 along the second direction X intersecting the first direction Y, the number of bypasses of each heat exchange channel 213 is reduced, the impact on the heat exchange medium in the heat exchange plate 21 is reduced, and thus the flow resistance of the heat exchange plate 21 is effectively reduced; moreover, the design of the entire flow channel is simpler, facilitating the processing and manufacturing of each branch channel 214; and it has been verified that the design time of this solution can be shortened by about 3 hours.

[0074] In some embodiments, in combination with Figure 3 or Figure 4 , in some adjacent two hot channel areas 21a and cold channel areas 21b, at least one branch channel 214 of the hot channel area 21a is the upstream part of a heat exchange channel 213 along its flow path; at least one branch channel 214 of the cold channel area 21b is the downstream part of the same heat exchange channel 213 along its flow path; and / or in some adjacent two hot channel areas 21a and cold channel areas 21b, at least one branch channel 214 in the hot channel area 21a is the upstream part of one of the heat exchange channels 213 among a plurality of heat exchange channels 213 along its flow path; at least one branch channel 214 in the cold channel area 21b is the downstream part of another heat exchange channel 213 among a plurality of heat exchange channels 213 along its flow path.

[0075] Among them, when the heat exchange medium flows through the heat exchange flow channel 213, it first flows through the upstream part of the heat exchange flow channel 213, and then flows through the downstream part of the heat exchange flow channel 213. It can be understood that in the same heat exchange flow channel 213, as the heat exchange medium flows from the upstream part to the downstream part, the temperature of the heat exchange medium decreases, so that the temperature of the flow channel area of the downstream part of the corresponding heat exchange flow channel 213 is lower than the temperature of the flow channel area of the upstream part of the corresponding heat exchange flow channel 213.

[0076] As an example, for every two adjacent hot flow channel areas 21a and cold flow channel areas 21b, the branch flow channels 214 of the hot flow channel area 21a and the branch flow channels 214 of the cold flow channel area 21b are respectively the upstream part and the downstream part in the flow path of the same heat exchange flow channel 213.

[0077] In this example, each heat exchange flow channel 213 includes a plurality of branch flow channels 214. At least some of the plurality of branch flow channels 214 flow back and forth, and along the flow path of the heat exchange flow channel 213, one or more branch flow channels 214 at the upstream are located in the hot flow channel area 21a, and one or more branch flow channels 214 at the downstream are located in the cold flow channel area 21b adjacent to the hot flow channel area 21a.

[0078] As another example, for every two adjacent hot flow channel areas 21a and cold flow channel areas 21b, the branch flow channel 214 of the hot flow channel area 21a is the upstream part in the flow path of a heat exchange flow channel 213, and the branch flow channel 214 of the cold flow channel area 21b is the downstream part in the flow path of another heat exchange flow channel 213.

[0079] In this example, for a plurality of heat exchange flow channels 213, among two heat exchange flow channels 213 adjacent along the first direction Y, each heat exchange flow channel 213 includes a plurality of branch flow channels 214. For the convenience of description, the following refers to these two adjacent heat exchange flow channels 213 as the first heat exchange flow channel and the second heat exchange flow channel; one or more branch flow channels 214 at the upstream of the first heat exchange flow channel are located in the hot flow channel area 21a; one or more branch flow channels 214 at the downstream of the second heat exchange flow channel are located in the cold flow channel area 21b adjacent to the hot flow channel area 21a; among them, the temperature of the heat exchange medium in the branch flow channel 214 at the upstream of the first heat exchange flow channel is higher than the temperature of the heat exchange medium in the branch flow channel 214 at the downstream of the second heat exchange flow channel. It can be understood that one or more branch flow channels 214 at the downstream of the first heat exchange flow channel are located in another cold flow channel area 21b adjacent to the hot flow channel area 21a; one or more branch flow channels 214 at the upstream of the second heat exchange flow channel are located in another hot flow channel area 21a adjacent to the cold flow channel area 21b.

[0080] As another example, for some adjacent two hot runner zones 21a and cold runner zones 21b, the branch runners 214 of the hot runner zone 21a and the branch runners 214 of the cold runner zone 21b are respectively the upstream part and the downstream part of the same heat exchange runner 213 along its flow path. For some adjacent two hot runner zones 21a and cold runner zones 21b, the branch runner 214 of the hot runner zone 21a is the upstream part of a heat exchange runner 213 along its flow path, and the branch runner 214 of the cold runner zone 21b is the downstream part of another heat exchange runner 213 along its flow path. For specific details, reference can be made to the relevant description above.

[0081] In this embodiment, by arranging the upstream part of the same heat exchange runner 213 in the hot runner zone 21a and the downstream part in the cold runner zone 21b, the heat exchange medium flowing through the same heat exchange runner 213 can achieve the hot and cold alternation of the heat exchange plate 21 along the first direction Y as the temperature changes during the flowing process. This not only helps to achieve the temperature uniformity of the heat exchange plate 21 along the first direction Y, but also the design method of the heat exchange runner 213 is relatively simple and the cost is low. And / or, by arranging the upstream part of one heat exchange runner 213 in the hot runner zone 21a and the downstream part of another heat exchange runner 213 in the cold runner zone 21b, the heat exchange medium flowing through different heat exchange runners 213 can achieve the hot and cold alternation of the heat exchange plate 21 along the first direction Y. This not only helps to achieve the temperature uniformity of the heat exchange plate 21 along the first direction Y, but also compared with the scheme where the same heat exchange runner 213 is distributed in both the hot runner zone 21a and the cold runner zone 21b at the same time, the winding times of the heat exchange runner 213 can be reduced, so as to reduce the number of branch runners 214 in the heat exchange runner 213, thereby effectively shortening the total length of the heat exchange runner 213 and reducing the flow resistance of the corresponding heat exchange runner 213.

[0082] In some embodiments, at least one battery cell 10 is correspondingly arranged for each adjacent two hot runner zones 21a and cold runner zones 21b.

[0083] Among them, for each adjacent two hot runner zones 21a and cold runner zones 21b, one battery cell 10 or multiple battery cells 10 distributed along the first direction Y can be correspondingly arranged. In this way, the heat exchange plate 21 with hot and cold alternation distribution can uniformly heat each battery cell 10 distributed along the first direction Y, so that the temperatures of each battery cell 10 distributed along the first direction Y are basically the same; in addition, since each branch runner 214 extends from the first side m of the heat exchange plate 21 to the second side n of the heat exchange plate 21 along the second direction X respectively, the temperatures of each battery cell 10 distributed along the second direction X are also basically kept the same, effectively improving the temperature uniformity of each battery cell 10 in the battery box 20.

[0084] In one embodiment, in combination with Figure 4 and Figure 5 , Figure 5Schematic layout diagram of two heat exchange channels provided on a heat exchange plate according to an embodiment of the present application; the heat exchange plate 21 has a hot channel area 21a, a cold channel area 21b, and a liquid outlet channel area 21c along the first direction Y; each heat exchange channel 213 includes at least one inlet branch channel 215 and at least one outlet branch channel 216; the inlet branch channels 215 of all the heat exchange channels 213 are provided in the hot channel area 21a, or in the hot channel area 21a and the cold channel area 21b; the outlet branch channels 216 of all the heat exchange channels 213 are provided in the liquid outlet channel area 21c; wherein, along the first direction Y towards the direction close to the liquid outlet channel area 21c, the number of the branch channels 214 of each heat exchange channel 213 gradually increases.

[0085] Among them, all the inlet branch channels 215 of the same heat exchange channel 213 are located upstream of all the outlet branch channels 216; each heat exchange channel 213 is directly connected to the liquid outlet 212 through one end of the outlet branch channel 216. When the heat exchange channel 213 includes a plurality of inlet branch channels 215, the plurality of inlet branch channels 215 can be connected in series and / or in parallel. It can be understood that the plurality of inlet branch channels 215 connected in series are arranged in a winding manner back and forth. When the heat exchange channel 213 includes a plurality of outlet branch channels 216, the plurality of outlet branch channels 216 can be connected in parallel together, and one end of each outlet branch channel 216 is directly connected to the liquid outlet 212 respectively.

[0086] It can be understood that the area where all the outlet branch channels 216 of all the heat exchange channels 213 are located is the liquid outlet channel area 21c.

[0087] A plurality of heat exchange channels 213 are arranged at intervals along the first direction Y. Arranging a plurality of heat exchange channels 213 at intervals along the first direction Y means that the inlet branch channels 215 of the plurality of heat exchange channels 213 are arranged at intervals in sequence along the first direction Y; and / or the outlet branch channels 216 of the plurality of heat exchange channels 213 are arranged at intervals in sequence along the first direction Y.

[0088] In this embodiment, the two ends of each branch channel 214 of the heat exchange channels 213 (hereinafter referred to as edge heat exchange channels) located at both edge positions of the heat exchange plate 21 along the first direction Y can extend along the first direction Y to the positions near both sides of the heat exchange plate 21 along the first direction Y respectively. For the heat exchange channels 213 located between the two edge heat exchange channels (hereinafter referred to as intermediate heat exchange channels), since part of the edge heat exchange channels are arranged around the circumferential edge of the heat exchange plate 21, the distances between the two ends of each branch channel 214 of the intermediate heat exchange channels along the first direction Y and the first side m and the second side n are greater than the distances between the two ends of the edge heat exchange channels along the first direction Y and the first side m and the second side n. The two ends of the intermediate heat exchange channels extend along the first direction Y to a position as close as possible to the edge heat exchange channels, so as to heat the multiple battery cells 10 arranged on the heat exchange plate 21 along the first direction Y and the second direction X through the intermediate heat exchange channels and the edge heat exchange channels.

[0089] Of course, in other examples, it can also be that some branch channels 214 extend from the first side m of the heat exchange plate 21 to the second side n of the heat exchange plate 21 along the second direction X.

[0090] Among them, the number of branch channels 214 of the intermediate heat exchange channels and the number of branch channels 214 of the edge heat exchange channels can be specifically designed according to actual situations, as long as the total path length of the intermediate heat exchange channels is the same as or basically the same as the total path length of the edge heat exchange channels.

[0091] In this embodiment, by making the direction along the first direction Y towards the liquid outlet channel area 21c, the number of branch channels 214 of each heat exchange channel 213 gradually increases, so that the entire path lengths of the heat exchange channels 213 at different area positions of the heat exchange plate 21 are basically the same. When the diameters of each branch channel 214 are the same, the flow rates in each heat exchange channel 213 can be basically kept consistent, which is beneficial to realizing the temperature uniformity of the battery cells 10 in different areas within the battery box 20.

[0092] In one embodiment, the heat exchange plate 21 has a hot channel area 21a, a cold channel area 21b, and a liquid outlet channel area 21c along the first direction Y; each heat exchange channel 213 includes at least one inlet branch channel 215 and at least one outlet branch channel 216; the inlet branch channels 215 of all heat exchange channels 213 are arranged in the hot channel area 21a, or arranged in the hot channel area 21a and the cold channel area 21b; the outlet branch channels 216 of all heat exchange channels 213 are arranged in the liquid outlet channel area 21c; the distribution density of the outlet branch channels 216 in the liquid outlet channel area 21c is greater than the distribution density of the inlet branch channels 215 in the hot channel area 21a, and greater than the distribution density of the inlet branch channels 215 in the cold channel area 21b.

[0093] The distribution density of the branch channels 214 in the preset area refers to the total number of branch channels 214 provided per unit length along the first direction Y on the heat exchange plate 21. The greater the distribution density, the more the total number of branch channels 214 provided per unit length along the first direction Y on the heat exchange plate 21; the smaller the distribution density, the fewer the total number of branch channels 214 provided per unit length along the first direction Y on the heat exchange plate 21.

[0094] In this embodiment, by increasing the distribution density of the liquid outlet branch channels 216, more heat exchange medium flows through the liquid outlet channel area 21c, so as to increase the temperature of the liquid outlet channel area 21c, reduce the temperature difference between the liquid outlet channel area 21c and other areas, and is beneficial to improving the temperature uniformity of the battery cells 10 in each area of the battery device 200.

[0095] In one embodiment, each branch channel 214 on the heat exchange plate 21 is a straight channel.

[0096] Among them, all the liquid inlet branch channels 215 and liquid outlet branch channels 216 on the heat exchange plate 21 are straight channels. A straight channel means that the extension path of the branch channel 214 is straight.

[0097] Of course, in other embodiments, among all the branch channels 214 on the heat exchange plate 21, some branch channels 214 can be straight channels, and some branch channels 214 can be curved channels; such as a bent channel or a broken line channel, etc.

[0098] In this embodiment, compared with the curved channel, the straight channel can further reduce the impact on the heat exchange medium in the heat exchange channel 213, thereby further reducing the flow resistance of the heat exchange plate 21. Moreover, the straight channel is convenient for processing and preparation, has a simple process and low cost.

[0099] In one embodiment, see Figures 6 to 7 , Figure 6 is a layout schematic diagram of multiple heat exchange channels on the heat exchange plate provided in another embodiment of the present application; Figure 7 is a temperature change schematic diagram of high-temperature heat exchange medium flowing through Figure 6 the multiple heat exchange channels 213 shown; the heat exchange plate 21 has a hot channel area 21a, a cold channel area 21b and a liquid outlet channel area 21c along the first direction Y; each heat exchange channel 213 includes at least one liquid inlet branch channel 215 and at least one liquid outlet branch channel 216; the liquid inlet branch channels 215 of all the heat exchange channels 213 are arranged in the hot channel area 21a, or arranged in the hot channel area 21a and the cold channel area 21b; the liquid outlet branch channels 216 of all the heat exchange channels 213 are arranged in the liquid outlet channel area 21c; among them, the liquid outlet channel area 21c is located at the first side edge of the heat exchange plate 21 along the first direction Y; the hot channel area 21a and the cold channel area 21b are located in other areas of the heat exchange plate 21 along the first direction Y.

[0100] That is to say, in this embodiment, the inlet branch channels 215 of all the heat exchange channels 213 are arranged on the first side of the heat exchange plate 21 along the first direction Y of the heat exchange plate 21, and the outlet branch channels 216 of all the heat exchange channels 213 are arranged on the second side of the heat exchange plate 21 along the first direction Y of the heat exchange plate 21, so that all the inlet branch channels 215 and all the outlet branch channels 216 are respectively arranged on both sides of the heat exchange plate 21 along the first direction Y, thereby realizing the single-side inlet and single-side outlet of the heat exchange medium on the heat exchange plate 21 along the first direction Y.

[0101] In this embodiment, among all the heat exchange channels 213 on the heat exchange plate 21, along the direction from the second-side edge to the first-side edge of the heat exchange plate 21 along the first direction Y, the number of the branch channels 214 of each heat exchange channel 213 gradually increases; that is to say, the closer the heat exchange channel 213 is to the outlet flow channel area 21c along the first direction Y, the more the number of the branch channels 214 of the heat exchange channel 213.

[0102] In this embodiment, some adjacent hot flow channel areas 21a and cold flow channel areas 21b may be such that the upstream parts of two adjacent heat exchange channels 213 are located in the same hot flow channel area 21a; the downstream part of one of the heat exchange channels 213 is wound to form a plurality of branch channels 214 and is located in the adjacent cold flow channel area 21b.

[0103] In this embodiment, by winding the outlet branch channels 216 of each heat exchange channel 213 around one side edge of the heat exchange plate 21 and arranging the inlet branch channels 215 of each heat exchange channel 213 in other areas of the heat exchange plate 21, the requirements for different distribution positions of the inlet port 211 and the outlet port 212 on the heat exchange plate 21 can be met, and the compatibility is relatively good.

[0104] In one embodiment, in combination with Figure 3 and Figure 4 , the heat exchange plate 21 has a hot flow channel area 21a, a cold flow channel area 21b, and an outlet flow channel area 21c along the first direction Y; each heat exchange channel 213 includes at least one inlet branch channel 215 and at least one outlet branch channel 216; the inlet branch channels 215 of all the heat exchange channels 213 are arranged in the hot flow channel area 21a, or arranged in the hot flow channel area 21a and the cold flow channel area 21b; the outlet branch channels 216 of all the heat exchange channels 213 are arranged in the outlet flow channel area 21c; wherein, the outlet flow channel area 21c is located in the middle area of the heat exchange plate 21 along the first direction Y; the hot flow channel area 21a and the cold flow channel area 21b are distributed on both sides of the outlet flow channel area 21c along the first direction Y, and each side of the outlet flow channel area 21c has a plurality of hot flow channel areas 21a and a plurality of cold flow channel areas 21b that are alternately distributed.

[0105] It can be understood that the liquid inlet branch channels 215 of each heat exchange channel 213 are distributed on both sides of the middle region of the heat exchange plate 21 along the first direction Y; the liquid outlet branch channels 216 of each heat exchange channel 213 are distributed in the middle region of the heat exchange plate 21 along the first direction Y. Among them, each heat exchange channel 213 on the same side of the middle region winds around the edge of the heat exchange plate 21 along the second direction X to the middle region of the heat exchange plate 21 along the first direction Y, and is directly communicated with the liquid outlet 212 on one side of the heat exchange plate 21 along the second direction X.

[0106] Among them, for each heat flow channel area 21a and cold flow channel area 21b on the same side, for every two adjacent heat flow channel areas 21a and cold flow channel areas 21b, the branch channel 214 of the heat flow channel area 21a and the branch channel 214 of the cold flow channel area 21b can be the upstream part and downstream part of the same heat exchange channel 213 along its flow path; or the branch channel 214 of the heat flow channel area 21a is the upstream part of a heat exchange channel 213 along its flow path, and the branch channel 214 of the cold flow channel area 21b is the downstream part of another heat exchange channel 213 along its flow path.

[0107] Exemplarily, three (or four) heat exchange channels 213 are respectively arranged on each side of the middle region of the heat exchange plate 21 along the first direction Y. Defining the three heat exchange channels 213 in the direction close to the middle region as the first heat exchange channel, the second heat exchange channel and the third heat exchange channel respectively. Among them, the first heat exchange channel includes two liquid inlet branch channels 215 and two liquid outlet branch channels 216 respectively communicated with the two liquid inlet branch channels 215; the area where the two liquid inlet branch channels 215 of the first heat exchange channel are located defines and forms the first heat flow channel area 21a. The second heat exchange channel includes three liquid inlet branch channels 215 and one liquid outlet branch channel 216. The three liquid inlet branch channels 215 are sequentially communicated, and the liquid outlet branch channel 216 is directly communicated with the liquid inlet branch channel 215; among them, one liquid inlet branch channel 215 closest to the liquid inlet 211 in the second heat exchange channel is located in the second heat flow channel area 21a; the areas where the other two liquid inlet branch channels 215 in the second heat exchange channel are located serve as the first cold flow channel area 21b between the first heat flow channel area 21a and the second heat flow channel area 21a. The third heat exchange channel includes five liquid inlet branch channels 215 and one liquid outlet branch channel 216. Among them, two liquid inlet branch channels 215 are directly communicated with the liquid inlet 211, and the area where these two liquid inlet branch channels 215 and one liquid inlet branch channel 215 closest to the liquid inlet 211 in the second heat exchange channel are located is defined as the second heat flow channel area 21a; the other three liquid inlet branch channels 215 are connected in series and / or in parallel and are located in the second cold flow channel area 21b. The liquid outlet branch channels 216 of these three heat exchange channels 213 respectively wind around to the middle region and extend along the second direction X to be directly communicated with the liquid outlet 212.

[0108] In this embodiment, for each heat exchange channel 213 located on each side of the liquid outlet channel region 21c, the number of branch channels 214 of the heat exchange channel 213 closer to the liquid outlet channel region 21c along the first direction Y is greater.

[0109] In this embodiment, by arranging the liquid outlet branch channels 216 of each heat exchange channel 213 in the middle region of the heat exchange plate 21 to form the liquid outlet channel region 21c; and distributing the liquid inlet branch channels 215 of each heat exchange channel 213 on both sides of the liquid outlet channel region 21c, so as to form a cold and hot alternating region on both sides of the liquid outlet channel region 21c, and there are multiple hot channel regions 21a and multiple cold channel regions 21b with alternating distribution on each side, it can make the temperatures of the two side edges of the heat exchange plate 21 along the first direction Y basically the same, thereby reducing the temperature difference value between the two side edges of the heat exchange plate 21 along the first direction Y, and further improving the temperature uniformity of each battery cell 10 arranged on the heat exchange plate 21.

[0110] In one embodiment, referring to Figure 3 or Figure 4 , with the central axis of the liquid inlet port 211 extending along the second direction X as the axis of symmetry, multiple heat exchange channels 213 are symmetrically arranged based on the axis of symmetry.

[0111] In Figure 3 the corresponding embodiment, each heat exchange channel 213 is symmetrically distributed based on the axis of symmetry.

[0112] For the convenience of description, it is defined that the whole formed by all the liquid outlet branch channels 216 is the liquid outlet assembly; in this embodiment, the liquid inlet branch channels 215 of all the heat exchange channels 213 are distributed on both sides of the liquid outlet assembly. Exemplarily, there are eight heat exchange channels 213 arranged on the heat exchange plate 21, and the liquid inlet branch channels 215 in the eight heat exchange channels 213 are symmetrically arranged based on the axis of symmetry; the liquid outlet branch channels 216 in the eight heat exchange channels 213 are also symmetrically arranged based on the axis of symmetry.

[0113] In this embodiment, multiple heat exchange channels 213 can be symmetrically distributed on the heat exchange plate 21 along the first direction Y, which can reduce the temperature difference value between the regions on both sides of the axis of symmetry of the heat exchange plate 21, and further improve the temperature uniformity of the battery cells 10 in the regions on both sides of the axis of symmetry of the heat exchange plate 21. Moreover, compared with the solution in which the upstream part of a heat exchange channel 213 is located on one side of the heat exchange plate 21 along the axis of symmetry and the downstream part of the heat exchange channel 213 is located on the other side of the heat exchange plate 21, the path of the heat exchange channel 213 is effectively shortened, and the temperature difference value between the upstream part and the downstream part of each heat exchange channel 213 is small, so that the temperature uniformity of each region of the heat exchange plate 21 along the first direction Y can be further improved, and further the temperature uniformity of the battery cells 10 arranged in each region of the heat exchange plate 21 can be improved.

[0114] In one embodiment, a battery box body 20 is further provided. The battery box body 20 includes a heat exchange plate 21, which has a liquid inlet 211, a liquid outlet 212, and a plurality of heat exchange channels 213. Both ends of each heat exchange channel 213 are directly communicated with the liquid inlet 211 and the liquid outlet 212 respectively. And each heat exchange channel 213 includes at least one branch channel 214 arranged at intervals along a first direction Y, and each branch channel 214 extends from a first side m of the heat exchange plate 21 to a second side n of the heat exchange plate 21 along a second direction X intersecting with the first direction Y. Wherein, at least a part of the heat exchange plate 21 in the first direction Y includes a plurality of heat flow channel regions 21a and cold flow channel regions 21b alternately distributed along the first direction Y. The heat flow channel regions 21a and the cold flow channel regions 21b respectively include at least one branch channel 214. For the specific introduction of the battery box body 20, reference can be made to the above text.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: Multiple battery cells; A battery box body having a receiving cavity, and the multiple battery cells are arranged in the receiving cavity; the battery box body includes a heat exchange plate, and the heat exchange plate has a liquid inlet, a liquid outlet, and a plurality of heat exchange channels; both ends of each heat exchange channel are directly communicated with the liquid inlet and the liquid outlet respectively; and each heat exchange channel includes at least one branch channel arranged at intervals in a first direction, and each branch channel extends from a first side of the heat exchange plate to a second side of the heat exchange plate in a second direction intersecting with the first direction. Wherein, at least a partial region of the heat exchange plate in the first direction includes a plurality of heat flow channels regions and cold flow channels regions that are alternately distributed in the first direction; the heat flow channels regions and the cold flow channels regions respectively include at least one of the branch channels.

2. The battery device according to claim 1, wherein In some adjacent two of the heat flow channels regions and the cold flow channels regions, at least one branch channel of the heat flow channels region is an upstream part in the flow path of one heat exchange channel; at least one branch channel of the cold flow channels region is a downstream part in the flow path of the same heat exchange channel; and / or In some adjacent two of the heat flow channels regions and the cold flow channels regions, at least one branch channel in the heat flow channels region is an upstream part in the flow path of one of the plurality of heat exchange channels; at least one branch channel in the cold flow channels region is a downstream part in the flow path of another one of the plurality of heat exchange channels.

3. The battery device according to claim 1, wherein At least one of the battery cells is correspondingly arranged for each adjacent two of the heat flow channels regions and the cold flow channels regions.

4. The battery device according to claim 1, wherein The heat exchange plate has the heat flow channels region, the cold flow channels region, and a liquid outlet flow channels region in the first direction; each heat exchange channel includes at least one liquid inlet branch channel and at least one liquid outlet branch channel; the liquid inlet branch channels of all the heat exchange channels are arranged in the heat flow channels region, or arranged in the heat flow channels region and the cold flow channels region; the liquid outlet branch channels of all the heat exchange channels are arranged in the liquid outlet flow channels region; Wherein, in the direction of approaching the liquid outlet flow channels region along the first direction, the number of branch channels of each heat exchange channel gradually increases.

5. The battery device according to claim 1, wherein The heat exchange plate has the heat flow channels region, the cold flow channels region, and a liquid outlet flow channels region in the first direction; each heat exchange channel includes at least one liquid inlet branch channel and at least one liquid outlet branch channel; the liquid inlet branch channels of all the heat exchange channels are arranged in the heat flow channels region, or arranged in the heat flow channels region and the cold flow channels region; the liquid outlet branch channels of all the heat exchange channels are arranged in the liquid outlet flow channels region; Wherein, the distribution density of the liquid outlet branch channels in the liquid outlet flow channels region is greater than the distribution density of the liquid inlet branch channels in the heat flow channels region, and greater than the distribution density of the liquid inlet branch channels in the cold flow channels region.

6. The battery device according to any one of claims 1-5, characterized in that each of the branch channels on the heat exchange plate is a straight channel.

7. The battery device according to any one of claims 1-5, characterized in that the heat exchange plate has the heat channel area, the cold channel area and the liquid outlet channel area along the first direction; each heat exchange channel includes at least one liquid inlet branch channel and at least one liquid outlet branch channel; the liquid inlet branch channels of all the heat exchange channels are arranged in the heat channel area, or arranged in the heat channel area and the cold channel area; the liquid outlet branch channels of all the heat exchange channels are arranged in the liquid outlet channel area; wherein, the liquid outlet channel area is located at the first side edge of the heat exchange plate along the first direction; the heat channel area and the cold channel area are located in other areas of the heat exchange plate along the first direction.

8. The battery device according to any one of claims 1-5, characterized in that the heat exchange plate has the heat channel area, the cold channel area and the liquid outlet channel area along the first direction; each heat exchange channel includes at least one liquid inlet branch channel and at least one liquid outlet branch channel; the liquid inlet branch channels of all the heat exchange channels are arranged in the heat channel area, or arranged in the heat channel area and the cold channel area; the liquid outlet branch channels of all the heat exchange channels are arranged in the liquid outlet channel area; wherein, the liquid outlet channel area is located in the middle area of the heat exchange plate along the first direction; the heat channel area and the cold channel area are distributed on both sides of the liquid outlet channel area along the first direction, and each side of the liquid outlet channel area has a plurality of the heat channel areas and a plurality of the cold channel areas alternately distributed.

9. The battery device according to claim 8, characterized in that with the central axis extending along the second direction of the liquid inlet as the axis of symmetry, a plurality of the heat exchange channels are symmetrically arranged based on the axis of symmetry.

10. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1-9.

11. A battery box body, characterized in that, Comprising: a heat exchange plate; the heat exchange plate has a liquid inlet, a liquid outlet and a plurality of heat exchange channels; both ends of each heat exchange channel are directly communicated with the liquid inlet and the liquid outlet respectively; and each heat exchange channel includes at least one branch channel arranged at intervals along the first direction, and each branch channel extends from the first side edge of the heat exchange plate to the second side edge of the heat exchange plate along a second direction intersecting with the first direction; wherein, at least a part of the heat exchange plate along the first direction includes a plurality of heat channel areas and cold channel areas alternately distributed along the first direction; the heat channel areas and the cold channel areas respectively include at least one of the branch channels.

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