Battery apparatus and electric apparatus

Abstract

The present application relates to the technical field of batteries, and discloses a battery apparatus and an electric apparatus. The battery apparatus has high reliability. The battery apparatus comprises a battery cell assembly and a thermal management component, and the battery cell assembly comprises a plurality of battery cells arranged in a first direction. The thermal management component is arranged on one side of the battery cell assembly in a second direction and is used for adjusting the temperature of the battery cells, and the second direction intersects the first direction. The heat exchange efficiency between the thermal management component and the battery cell located at an end portion of at least one of the two ends of the battery cell assembly in the first direction is less than the heat exchange efficiency between the thermal management component and any battery cell located between the two ends of the battery cell assembly in the first direction.

Description

Battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] How to improve the reliability of the battery device is a problem to be solved in the battery technology.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery device and an electric device, which can improve the reliability of the battery device.

[0006] In a first aspect, the present application provides a battery device, the battery device comprising a battery monomer assembly and a thermal management component, the battery monomer assembly comprising a plurality of battery monomers arranged along a first direction. The thermal management component is arranged on one side of the battery monomer assembly along a second direction, and is used for adjusting the temperature of the battery monomers, the second direction intersecting the first direction. The heat exchange efficiency of the thermal management component and the battery monomers at the end of at least one end of the battery monomer assembly along the first direction is less than the heat exchange efficiency of the thermal management component and any battery monomer between the two ends along the first direction.

[0007] In the above scheme, since the heat exchange efficiency of the thermal management component and the battery monomers at the end of at least one end of the battery monomer assembly along the first direction is less than the heat exchange efficiency of the thermal management component and any battery monomer between the two ends along the first direction, the temperature distribution of the battery monomer assembly is more uniform, the risk of thermal stress concentration is lower, and the reliability of the battery device is higher.

[0008] In one or more embodiments of the first aspect, the thermal management component has a flow channel containing a heat exchange medium. The thermal management component further comprises a medium inlet and a medium outlet, both of which are in communication with the flow channel. The orthographic projection of the battery monomer assembly on the thermal management component is a first projection, and the medium inlet and the medium outlet are located on the same side of the first projection in the first direction.

[0009] In the above scheme, since the medium inlet and the medium outlet are located on the same side of the first projection in the first direction, the heat exchange efficiency of the heat management component and the battery cell located at the end of at least one end of the battery cell assembly in the first direction is set to be less than the heat exchange efficiency of any battery cell located between the two ends in the first direction. The risk of thermal stress concentration in the battery cell assembly due to excessive temperature difference between the battery cell at the end and the remaining battery cells can be significantly reduced.

[0010] In one or more embodiments of the first aspect, among the plurality of battery cells, the two battery cells located at the two ends are respectively a first end battery cell and a second end battery cell. The first end battery cell is closer to the medium inlet and the medium outlet than the second end battery cell. The first end battery cell at least partially overlaps the flow channel, and the second end battery cell does not overlap the flow channel.

[0011] In the above scheme, since the first end battery cell at least partially overlaps the flow channel and the second end battery cell does not overlap the flow channel, the heat exchange efficiency of the two end battery cells is relatively low, and the heat exchange efficiency of the remaining battery cells is relatively high. This can make the temperature difference of all battery cells in the battery cell assembly during heat exchange relatively small, so that the temperature distribution of the entire battery cell assembly is relatively uniform.

[0012] In one or more embodiments of the first aspect, the flow channel includes a first flow channel, a second flow channel, a third flow channel, a plurality of first branch flow channels, and a plurality of second branch flow channels. In the first direction, the first flow channel is spaced apart from the second flow channel, and the first flow channel is located between the medium inlet and the second flow channel. The plurality of first branch flow channels are arranged side by side between the first flow channel and the second flow channel, and the medium inlet communicates with the first flow channel. In the first direction, the second flow channel is spaced apart from the third flow channel, and the third flow channel is located between the medium outlet and the second flow channel. The plurality of second branch flow channels are arranged side by side between the second flow channel and the third flow channel, and the medium outlet communicates with the third flow channel.

[0013] In the above scheme, subdividing the flow channel into flow channels and branch flow channels can further improve the uniformity of heat exchange of the heat exchange medium.

[0014] In one or more embodiments of the first aspect, the thermal management component has a first cavity, a second cavity, a third cavity and a fourth cavity connected in sequence. The medium inlet is connected to the first cavity, and the medium outlet is connected to the fourth cavity. The first cavity and the second cavity are separated by a first partition plate, and the first partition plate is provided with a first communication port connecting the first cavity and the second cavity. The second cavity and the third cavity are separated by a second partition plate, and the second partition plate is provided with a second communication port connecting the second cavity and the third cavity. The third cavity and the fourth cavity are separated by a third partition plate, and the third partition plate is provided with a third communication port connecting the third cavity and the fourth cavity. The second cavity is divided into a plurality of first branch flow channels by a plurality of fourth partition plates, and the third cavity is divided into a plurality of second branch flow channels by a plurality of fifth partition plates.

[0015] In the above scheme, the different cavities are sequentially connected between the medium inlet and the medium outlet by setting the partition plates and the communication ports on the partition plates, which has lower processing cost and higher processing efficiency.

[0016] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the second direction, the orthographic projection of the first end battery cell at least partially overlaps the orthographic projection of the first cavity; and / or, the orthographic projection of the first end battery cell at least partially overlaps the orthographic projection of the fourth cavity.

[0017] In the above scheme, since the first cavity is only provided with the medium inlet and the fourth cavity is only provided with the medium outlet, the heat exchange efficiency of the heat exchange medium in the first cavity and the fourth cavity is low. In the same projection plane perpendicular to the second direction, the orthographic projection of the first end battery cell is set to at least partially overlap the orthographic projection of the first cavity and / or the orthographic projection of the fourth cavity, so that the heat exchange efficiency of the first end battery cell remains low, which is beneficial to balance the temperature difference of the battery cell assembly.

[0018] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the second direction, the orthographic projection of the battery cell other than the first end battery cell and the second end battery cell at least partially overlaps the orthographic projection of the second cavity; and / or, the orthographic projection of the battery cell other than the first end battery cell and the second end battery cell at least partially overlaps the orthographic projection of the third cavity.

[0019] In the above scheme, since the flow channels in the second cavity and the third cavity have relatively large heat exchange areas, in the same projection plane perpendicular to the second direction, the orthographic projection of the battery cell other than the first end battery cell and the second end battery cell is set to at least partially overlap the orthographic projection of the second cavity and / or the orthographic projection of the third cavity, so that the heat exchange efficiency of the other battery cell is higher than that of the end battery cell, which is beneficial to balance the temperature difference of the battery cell assembly.

[0020] In one or more embodiments of the first aspect, the fourth partitions have first ends proximate to the first partition, the first ends being spaced apart from the first partition. Among the plurality of fourth partitions, the fourth partition closer to the first communication port has a greater distance between the first end and the first partition.

[0021] In the above scheme, since the fourth partition closer to the first communication port has a greater distance between the first end and the first partition, the heat exchange medium can flow faster to the rest of the heat management component after passing through the first communication port and flowing toward the medium outlet, thereby improving the heat exchange efficiency.

[0022] In one or more embodiments of the first aspect, the second cavity has a first inner wall opposite to the first partition in the first direction. The fourth partitions have second ends proximate to the first inner wall, the second ends being spaced apart from the first inner wall. Among the plurality of fourth partitions, the fourth partition closer to the second communication port has a greater distance between the second end and the first inner wall.

[0023] In the above scheme, since the fourth partition closer to the second communication port has a greater distance between the second end and the first inner wall, the heat exchange medium can flow faster to the rest of the heat management component after passing through the second communication port and flowing toward the medium outlet, thereby improving the heat exchange efficiency.

[0024] In one or more embodiments of the first aspect, the fifth partitions have third ends proximate to the third partition, the third ends being spaced apart from the third partition. Among the plurality of fifth partitions, the fifth partition closer to the third communication port has a greater distance between the third end and the third partition.

[0025] In the above scheme, since the fifth partition closer to the third communication port has a greater distance between the third end and the third partition, the heat exchange medium can flow faster through the third communication port and toward the medium outlet, thereby improving the heat exchange efficiency.

[0026] In one or more embodiments of the first aspect, the third cavity has a second inner wall opposite to the fifth partition in the first direction. The fifth partitions have fourth ends proximate to the second inner wall, the fourth ends being spaced apart from the second inner wall. Among the plurality of fifth partitions, the fifth partition closer to the second communication port has a greater distance between the fourth end and the second inner wall.

[0027] In the above scheme, since the fifth partition closer to the second communication port has a greater distance between the fourth end and the second inner wall, the heat exchange medium can flow faster to the rest of the heat management component after passing through the second communication port and flowing toward the medium outlet, thereby improving the heat exchange efficiency.

[0028] In one or more embodiments of the first aspect, the heat management component further comprises a fifth cavity and a sixth cavity, the fifth cavity is located on a side of the second cavity away from the first cavity along the first direction, and the sixth cavity is located on a side of the third cavity away from the fourth cavity, and the fifth cavity and the sixth cavity are not in communication with the flow channel.

[0029] In the above scheme, since the fifth cavity and the sixth cavity are not in communication with the flow channel, the heat management component has a region with relatively low heat exchange efficiency, and the end battery cells are arranged in this region, which is beneficial to balancing the temperature difference of the battery cell assembly.

[0030] In one or more embodiments of the first aspect, the heat management component comprises a first profile, a second profile, a third profile, a fourth profile, a fifth profile and a sixth profile which are formed separately, the first profile has the first cavity, the second profile has the second cavity, the third profile has the third cavity, the fourth profile has the fourth cavity, the fifth profile has the fifth cavity, and the sixth profile has the sixth cavity.

[0031] In the above scheme, the heat management component is formed by splicing profiles, the flow channel can be formed by the inherent configuration of the profiles, which is low in cost and high in processing efficiency. At the same time, the heat management component has low deformation and high precision during processing.

[0032] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the second direction, the orthographic projection of the second end battery cell at least partially overlaps with the orthographic projection of the fifth cavity; and / or, the orthographic projection of the second end battery cell at least partially overlaps with the orthographic projection of the sixth cavity.

[0033] In the above scheme, since the fifth cavity and the sixth cavity are not in communication with the flow channel, the second end battery cell arranged correspondingly can have relatively low heat exchange efficiency, so that the temperature difference between each battery cell in the battery cell assembly is relatively small.

[0034] In one or more embodiments of the first aspect, among the plurality of battery cells, the two battery cells at the two ends are respectively the first end battery cell and the second end battery cell. The battery device further comprises a first thermal insulation pad arranged between the first end battery cell and the heat management component; and / or, the battery device further comprises a second thermal insulation pad arranged between the second end battery cell and the heat management component.

[0035] In the above scheme, by arranging the thermal insulation pad between the end battery cell and the heat management component, the heat exchange efficiency of the heat management component on the end battery cell can be reduced, so that the temperature difference between each battery cell in the battery cell assembly is relatively small, and the risk of thermal stress concentration in the battery cell assembly is reduced.

[0036] In one or more embodiments of the first aspect, the two battery cells at the two ends are a first end battery cell and a second end battery cell. The battery device further comprises a first limiting member and a second limiting member, the first limiting member and the second limiting member are spaced apart along the first direction, and the plurality of battery cells are arranged between the first limiting member and the second limiting member. The first end battery cell is arranged at one end of the plurality of battery cells close to the first limiting member, and the second end battery cell is arranged at one end of the plurality of battery cells close to the second limiting member.

[0037] In the above scheme, the limiting member increases the heat exchange path of the end battery cell and the heat management component, and sets the heat exchange efficiency of the heat management component and the end battery cell at at least one end of the two ends along the first direction of the battery cell assembly to be less than the heat exchange efficiency of any battery cell between the two ends along the first direction, which can significantly reduce the risk of thermal stress concentration of the battery cell assembly.

[0038] In one or more embodiments of the first aspect, the battery device further comprises a third thermal insulation pad arranged between the first limiting member and the first end battery cell, and / or a fourth thermal insulation pad arranged between the second limiting member and the second end battery cell.

[0039] In the above scheme, by arranging a thermal insulation pad between the limiting member and the end battery cell, the heat exchange efficiency of the heat management component to the end battery cell can be reduced, the temperature difference between each battery cell in the battery cell assembly is relatively small, and the risk of thermal stress concentration of the battery cell assembly is reduced.

[0040] In one or more embodiments of the first aspect, the first limiting member is made of metal, and / or the second limiting member is made of metal.

[0041] In the above scheme, since the limiting member made of metal has relatively high thermal conductivity, the heat exchange efficiency of the heat management component and the end battery cell at at least one end of the two ends along the first direction of the battery cell assembly is set to be less than the heat exchange efficiency of any battery cell between the two ends along the first direction, which can significantly reduce the risk of thermal stress concentration of the battery cell assembly.

[0042] In a second aspect, the present application provides a power consuming device comprising the battery device of the above scheme, and the battery device is used to provide electric energy.

[0043] Since the battery device of the above scheme has high reliability, the power consuming device comprising the battery device of the above scheme also has high reliability.

[0044] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application. Rather, the scope of the present application is to be accorded the broadest interpretation so as to encompass all such modifications and alternative methods of practice employed by those in the art. In the drawings:

[0046] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0047] Fig. 2 is an exploded view of a battery device according to some embodiments of the present application;

[0048] Fig. 3 is an axial sectional view of a partial structure of a battery device according to some embodiments of the present application;

[0049] Fig. 4 is an axial sectional view of a partial structure of a battery device according to other embodiments of the present application;

[0050] Fig. 5 is a structural schematic diagram of a thermal management member according to some embodiments of the present application;

[0051] Fig. 6 is a sectional view of a thermal management member according to some embodiments of the present application;

[0052] Fig. 7 is an enlarged view of a portion of Fig. 6 at A;

[0053] Fig. 8 is an enlarged view of a portion of Fig. 6 at B.

[0054] The reference signs in the detailed description of the embodiments are as follows: 1000-vehicle; 200-controller; 300-motor; 100-battery device; 11-box body; 111-first box body; 112-second box body; 12-battery cell; 121-first end battery cell; 122-second end battery cell; 13-thermal management component; 131-medium inlet; 132-medium outlet; 133-first manifold; 134-second manifold; 135-third manifold; 136-first branch; 137-second branch; 138-first cavity; 139-second cavity; 1310-third cavity; 1311-fourth cavity; 1312-first partition plate; 13121-first communication port; 1313-second partition plate; 13131-second communication port; 1314-third partition plate; 13141-third communication port; 1315-fourth partition plate; 1316-fifth partition plate; 1317-first inner wall; 1318-second inner wall; 1319-fifth cavity; 1320-sixth cavity; 1321-first profile; 1322-second profile; 1323-third profile; 1324-fourth profile; 1325-fifth profile; 1326-sixth profile; 14-first thermal insulation pad; 15-first limiting piece; 16-second limiting piece; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0055] 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 more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0058] 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 the application. The appearances of the phrase“in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common set of embodiments, although they can. Those skilled in the art will recognize that the embodiments described herein can be combined with other embodiments in various ways.

[0059] In the description of embodiments of the application, the term“a plurality of” refers to two or more (including two), and so on, by analogy.“A plurality of groups” refers to two or more groups (including two groups), and so on, by analogy.“A plurality of pieces” refers to two or more pieces (including two pieces), and so on, by analogy.

[0060] In some high-power applications such as electric vehicles, the application of battery devices includes three levels: battery cells, battery modules, and battery apparatuses. A battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impacts, heat, vibration, and the like. A battery apparatus refers to the final state of the battery apparatus system installed in an electric vehicle. The battery apparatus referred to in embodiments of the application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery apparatus generally includes a box for packaging one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0061] The battery apparatus referred to in embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through busbar components.

[0062] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0063] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies housed in the box.

[0064] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the box by fixing the battery module in the box.

[0065] As an example, the battery cell assembly can also be housed in the case by directly fixing a plurality of battery cells to the case.

[0066] In the following, the rectangular battery cell will be mainly discussed. It should be understood that the embodiments described in the following are also applicable to the cylindrical battery cell or the pouch battery cell or the blade battery cell in some aspects.

[0067] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a case, and the end cap closes an opening of the case to define a receiving space for receiving the electrode assembly.

[0068] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0069] The battery device adjusts the temperature of the battery cell through the heat management component. In the heat exchange process of the heat exchange medium, there is a large temperature difference between the battery cell at the end of the general battery cell assembly and the remaining battery cells, which can cause excessive temperature difference between the battery cells in the battery cell assembly and easily cause thermal stress concentration. Once the above phenomenon occurs, the performance of the housing or other components of the battery cell will decrease, and even the material will be damaged, such as connection failure, housing rupture, and other adverse phenomena. The reliability of the battery device is poor.

[0070] In view of this, the present application provides a battery device, which includes a battery cell assembly and a heat management component. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The heat management component is arranged on one side of the battery cell assembly along a second direction, and is used to adjust the temperature of the battery cell. The second direction intersects the first direction. The heat exchange efficiency of the heat management component and the battery cell at the end of at least one end of the battery cell assembly along the first direction is less than the heat exchange efficiency of any battery cell located between the two ends along the first direction. Since the heat exchange efficiency of the heat management component and the battery cell at the end of at least one end of the battery cell assembly along the first direction is less than the heat exchange efficiency of any battery cell located between the two ends along the first direction, the temperature distribution of the battery cell assembly is more uniform, the risk of thermal stress concentration is lower, and the reliability of the battery device is higher.

[0071] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electric devices using battery devices.

[0072] The electric device includes but is not limited to: electric vehicles, electric vehicles, ships, and spacecraft, etc., for example, spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.

[0073] The following embodiments are described by taking a vehicle 1000 as an example.

[0074] For example, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 can be provided with a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0075] In order to meet different power demands, the battery device 100 can include a plurality of battery monomers 12. The plurality of battery monomers 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series connection and parallel connection. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery monomers 12 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form the battery device 100. That is, the plurality of battery monomers 12 can be directly connected to form the battery device 100, or can be connected to form a battery module, and the battery module can be connected to form the battery device 100.

[0076] For example, please refer to FIG. 2, which is an exploded view of a battery device 100 according to some embodiments of the present application. The battery device 100 can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which is hollow inside, and the plurality of battery cells 12 are contained in the box 11. As shown in FIG. 2, there are two boxes, a first box 111 and a second box 112, which are buckled together. The shapes of the first box 111 and the second box 112 can be determined according to the shape of the combination of the plurality of battery cells 12. The first box 111 and the second box 112 can each have one open face. For example, the first box 111 and the second box 112 can each be a hollow cuboid and each have only one face as an open face. The open face of the first box 111 and the open face of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are buckled together to form the box 11 with a closed cavity. The plurality of battery cells 12 are combined in parallel, in series, or in a hybrid manner and then placed in the box 11 formed by buckling the first box 111 and the second box 112.

[0077] Optionally, the battery device 100 can also include other structures, which will not be described one by one here. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the current collecting component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by a conductive mechanism.

[0078] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery modules, and these battery modules can be connected in series, in parallel, or in a hybrid manner.

[0079] According to some embodiments of the present application, referring to FIGS. 3-8, the present application provides a battery device 100, which comprises a battery cell assembly and a thermal management component 13. The battery cell assembly comprises a plurality of battery cells 12 arranged along a first direction X. The thermal management component 13 is arranged on one side of the battery cell assembly along a second direction Y, which intersects the first direction X, for adjusting the temperature of the battery cells 12. The heat exchange efficiency of the battery cells 12 at the end of the battery cell assembly along at least one of the two ends of the first direction X is less than the heat exchange efficiency of any battery cell 12 between the two ends of the first direction X.

[0080] There are various ways to set the heat exchange efficiency of the end battery cells 12 to be less than that of the remaining battery cells 12, including but not limited to: in embodiments where the thermal management component 13 has flow channels, the end battery cells 12 can be made not to overlap the flow channels. The area of the end battery cells 12 that overlaps the flow channels can also be made smaller than that of the remaining battery cells 12. The flow rate of the heat exchange medium in the flow channels corresponding to the end battery cells 12 can also be made smaller than that of the remaining battery cells 12. In some embodiments, the thermal conductivity of the material of the portion of the end battery cells 12 that contacts the thermal management component 13 can be made lower than that of the remaining battery cells 12. Of course, in some embodiments, a thermal insulation pad can also be added between the end battery cells 12 and the thermal management component 13. Of course, the heat exchange efficiency can also be adjusted by combining the above different ways.

[0081] The heat exchange medium can be a gas, a liquid, or a gas-liquid mixture, etc.

[0082] In some embodiments, the thermal management component 13 carries the battery cell assembly.

[0083] In some embodiments, the plurality of battery cells 12 can be fixed by a binding strap.

[0084] In some embodiments, the plurality of battery cells 12 can be fixed by a pressing strip.

[0085] The heat exchange efficiency can be determined by measuring the temperature and flow rate of the medium, calculating the heat input and output of the medium, or by measuring the temperature difference and heat exchange area of the medium, calculating the heat transfer coefficient of the medium, or by establishing a mathematical model, simulating the heat exchange process, and predicting the heat exchange effect. Of course, the heat exchange efficiency can also be detected by using thermal imaging technology.

[0086] In the above scheme, since the heat exchange efficiency of the thermal management component 13 and the battery monomer assembly located at the end of at least one end along the first direction X of the battery monomer 12 is less than the heat exchange efficiency of any battery monomer 12 located between the two ends along the first direction X, the temperature distribution of the battery monomer assembly is more uniform, the risk of thermal stress concentration is lower, and the reliability of the battery device 100 is higher.

[0087] According to some embodiments of the present application, referring to FIGS. 3-8, the thermal management component 13 has a flow channel containing a heat exchange medium. The thermal management component 13 further includes a medium inlet 131 and a medium outlet 132, both of which are in communication with the flow channel. The orthographic projection of the battery monomer assembly on the thermal management component 13 is a first projection, and the medium inlet 131 and the medium outlet 132 are located on the same side of the first projection in the first direction X.

[0088] In some embodiments, the medium inlet 131 and the medium outlet 132 are both water nozzles.

[0089] The flow channel can be formed by machining, injection molding, casting, 3D printing, and splicing, etc.

[0090] Hereinafter, the heat exchange area of the flow channel or the setting position of the heat insulation pad will be taken as an example for illustration. The above-mentioned other ways of adjusting the heat exchange efficiency can be adapted to the corresponding features.

[0091] The medium inlet 131 and the medium outlet 132 are located on the same side of the first projection in the first direction X, which also means that the assembly of the medium inlet 131 and the medium outlet 132 will not interfere with the battery monomer 12, and is conducive to improving the energy density of the battery device 100.

[0092] In the above scheme, since the medium inlet 131 and the medium outlet 132 are located on the same side of the first projection in the first direction X, the end battery monomer 12 near the medium inlet 131 and the medium outlet 132 has a higher risk of excessive temperature difference with the remaining battery monomers 12. By setting the heat exchange efficiency of the thermal management component 13 and the battery monomer assembly located at the end of at least one end along the first direction X of the battery monomer 12 to be less than the heat exchange efficiency of any battery monomer 12 located between the two ends along the first direction X, the risk of thermal stress concentration of the battery monomer assembly due to excessive temperature difference between the end battery monomer 12 and the remaining battery monomers 12 can be significantly reduced.

[0093] According to some embodiments of the present application, referring to FIGS. 3-8, among the plurality of battery cells 12, two battery cells 12 at two ends are respectively a first end battery cell 121 and a second end battery cell 122. The first end battery cell 121 is closer to the medium inlet 131 and the medium outlet 132 than the second end battery cell 122. The first end battery cell 121 at least partially overlaps the flow channel, and the second end battery cell 122 does not overlap the flow channel.

[0094] In some embodiments, among the plurality of battery cells 12, the battery cells 12 between the first end battery cell 121 and the second end battery cell 122 in the first direction X are middle battery cells 12. The area of the second end battery cell 122 overlapping the flow channel is less than the area of the first end battery cell 121 overlapping the flow channel, and the area of the first end battery cell 121 overlapping the flow channel is less than the area of the middle battery cells 12 overlapping the flow channel.

[0095] In the above scheme, since the first end battery cell 121 at least partially overlaps the flow channel and the second end battery cell 122 does not overlap the flow channel, the heat exchange efficiency of the two end battery cells 12 is relatively low, and the heat exchange efficiency of the remaining battery cells 12 is relatively high. This can make the temperature difference of all battery cells 12 in the battery cell assembly during heat exchange not large, so that the temperature distribution of the whole battery cell assembly is relatively uniform.

[0096] According to some embodiments of the present application, referring to FIGS. 3-8, the flow channel includes a first flow channel 133, a second flow channel 134, a third flow channel 135, a plurality of first branch flow channels 136, and a plurality of second branch flow channels 137. Along the first direction X, the first flow channel 133 is spaced apart from the second flow channel 134, the first flow channel 133 is located between the medium inlet 131 and the second flow channel 134, the plurality of first branch flow channels 136 are arranged side by side between the first flow channel 133 and the second flow channel 134, and the medium inlet 131 is in communication with the first flow channel 133. Along the first direction X, the second flow channel 134 is spaced apart from the third flow channel 135, the third flow channel 135 is located between the medium outlet 132 and the second flow channel 134, the plurality of second branch flow channels 137 are arranged side by side between the second flow channel 134 and the third flow channel 135, and the medium outlet 132 is in communication with the third flow channel 135.

[0097] The first flow channel 133, the second flow channel 134, the third flow channel 135, the plurality of first branch flow channels 136, and the plurality of second branch flow channels 137 can extend in the form of a straight line, a broken line, an arc, etc. That is, the specific configuration of each flow channel is not limited.

[0098] In the above scheme, subdividing the flow channel into flow channels and branch flow channels can further improve the uniformity of heat exchange of the heat exchange medium.

[0099] According to some embodiments of the present application, referring to FIGS. 3-8, the heat management component 13 has a first cavity 138, a second cavity 139, a third cavity 1310 and a fourth cavity 1311 in sequence. The medium inlet 131 is in communication with the first cavity 138, and the medium outlet 132 is in communication with the fourth cavity 1311. The first cavity 138 and the second cavity 139 are separated by a first partition plate 1312, and the first partition plate 1312 is provided with a first communication port 13121 for communication between the first cavity 138 and the second cavity 139. The second cavity 139 and the third cavity 1310 are separated by a second partition plate 1313, and the second partition plate 1313 is provided with a second communication port 13131 for communication between the second cavity 139 and the third cavity 1310. The third cavity 1310 and the fourth cavity 1311 are separated by a third partition plate 1314, and the third partition plate 1314 is provided with a third communication port 13141 for communication between the third cavity 1310 and the fourth cavity 1311. The second cavity 139 is divided into a plurality of first branch flow channels 136 by a plurality of fourth partition plates 1315, and the third cavity 1310 is divided into a plurality of second branch flow channels 137 by a plurality of fifth partition plates 1316.

[0100] The heat management component 13 is first divided into a plurality of cavities, and then divided into a plurality of flow channels, which has lower design and processing costs.

[0101] Similarly, the configuration of each cavity is not specifically limited.

[0102] In the above scheme, the different cavities are sequentially communicated between the medium inlet 131 and the medium outlet 132 by means of the partition plates and the communication ports provided on the partition plates, which has lower processing costs and higher processing efficiency.

[0103] According to some embodiments of the present application, referring to FIGS. 3-8, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the first end portion battery cell 121 at least partially overlaps the orthographic projection of the first cavity 138; and / or, the orthographic projection of the first end portion battery cell 121 at least partially overlaps the orthographic projection of the fourth cavity 1311.

[0104] Since the first cavity 138 is only provided with the medium inlet 131, and the fourth cavity 1311 is only provided with the medium outlet 132, the heat exchange efficiency of the heat exchange medium in the first cavity 138 and the fourth cavity 1311 is low.

[0105] In the above scheme, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the first end portion battery cell 121 is arranged to at least partially overlap the orthographic projection of the first cavity 138, and / or the orthographic projection of the fourth cavity 1311, which can keep the heat exchange efficiency of the first end portion battery cell 121 in a low state, and is beneficial to balancing the temperature difference of the battery cell assembly.

[0106] According to some embodiments of the present application, referring to FIGS. 3-8, in the same projection plane perpendicular to the second direction Y, the orthographic projection of each of the plurality of battery monomers 12, except for the first end battery monomer 121 and the second end battery monomer 122, at least partially overlaps with the orthographic projection of the second cavity 139; and / or, the orthographic projection of each of the plurality of battery monomers 12, except for the first end battery monomer 121 and the second end battery monomer 122, at least partially overlaps with the orthographic projection of the third cavity 1310.

[0107] In some embodiments, the heat exchange area of the flow channel in the second cavity 139 and the third cavity 1310 is relatively large, while the heat exchange area of the flow channel in the first cavity 138 and the fourth cavity 1311 is relatively small.

[0108] In the above scheme, in the same projection plane perpendicular to the second direction Y, the orthographic projection of each of the plurality of battery monomers 12, except for the first end battery monomer 121 and the second end battery monomer 122, is arranged to at least partially overlap with the orthographic projection of the second cavity 139 and / or the orthographic projection of the third cavity 1310, which can make the heat exchange efficiency of the other battery monomers 12 higher than that of the end battery monomers 12, and is conducive to balancing the temperature difference of the battery monomer assembly.

[0109] According to some embodiments of the present application, referring to FIGS. 3-8, the fourth partition plate 1315 has a first end close to the first partition plate 1312, and the first end is spaced apart from the first partition plate 1312. Among the plurality of fourth partition plates 1315, the closer the fourth partition plate 1315 is to the first communication port 13121, the greater the distance between the first end of the fourth partition plate 1315 and the first partition plate 1312.

[0110] The spacing area between the first end and the first partition plate 1312 is wedge-shaped, which has the effect of guiding flow and uniform flow. It can make the heat exchange medium more quickly and uniformly distributed.

[0111] In the above scheme, since the closer the fourth partition plate 1315 is to the first communication port 13121, the greater the distance between the first end of the fourth partition plate 1315 and the first partition plate 1312, during the process that the heat exchange medium passes through the first communication port 13121 and flows to the medium outlet 132, the heat exchange medium can flow to the rest of the thermal management component 13 more quickly, thereby improving the heat exchange efficiency.

[0112] According to some embodiments of the present application, referring to FIGS. 3-8, along the first direction X, the second cavity 139 has a first inner wall 1317 opposite the first partition plate 1312. The fourth partition plate 1315 has a second end close to the first inner wall 1317, and the second end is spaced apart from the first inner wall 1317. Among the plurality of fourth partition plates 1315, the closer the fourth partition plate 1315 is to the second communication port 13131, the greater the distance between the second end of the fourth partition plate 1315 and the first inner wall 1317.

[0113] The interval region between the first end and the second partition plate 1313 is wedge-shaped, which has the effect of guiding flow and uniform flow. The heat exchange medium can be more quickly and uniformly distributed.

[0114] In the above scheme, the closer the fourth partition plate 1315 is to the second communication port 13131, the greater the distance between the second end of the fourth partition plate 1315 and the first inner wall 1317. During the process that the heat exchange medium passes through the second communication port 13131 and flows to the medium outlet 132, the heat exchange medium can more quickly flow to the rest of the heat management component 13, thereby improving the heat exchange efficiency.

[0115] According to some embodiments of the present application, with reference to FIGS. 3-8, the fifth partition plate 1316 has a third end close to the third partition plate 1314, and the third end is spaced apart from the third partition plate 1314. Among the plurality of fifth partition plates 1316, the closer the fifth partition plate 1316 is to the third communication port 13141, the greater the distance between the third end of the fifth partition plate 1316 and the fifth partition plate 1316.

[0116] The interval region between the third end and the fifth partition plate 1316 is wedge-shaped, which has the effect of guiding flow and uniform flow. The heat exchange medium can be more quickly and uniformly distributed.

[0117] In some embodiments, the third partition plate 1314 and the first partition plate 1312 are integrally formed.

[0118] In the above scheme, the closer the fifth partition plate 1316 is to the third communication port 13141, the greater the distance between the third end of the fifth partition plate 1316 and the fifth partition plate 1316. The heat exchange medium can more quickly pass through the third communication port 13141 and flow to the medium outlet 132, thereby improving the heat exchange efficiency.

[0119] According to some embodiments of the present application, with reference to FIGS. 3-8, along the first direction X, the third cavity 1310 has a second inner wall 1318 opposite to the fifth partition plate 1316. The fifth partition plate 1316 has a fourth end close to the second inner wall 1318, and the fourth end is spaced apart from the second inner wall 1318. Among the plurality of fifth partition plates 1316, the closer the fifth partition plate 1316 is to the second communication port 13131, the greater the distance between the fourth end of the fifth partition plate 1316 and the second inner wall 1318.

[0120] In some embodiments, the first inner wall 1317 and the second inner wall 1318 are integrally formed.

[0121] The interval region between the fourth end and the second inner wall 1318 is wedge-shaped, which has the effect of guiding flow and uniform flow. The heat exchange medium can be more quickly and uniformly distributed.

[0122] In the above scheme, the fifth partition plate 1316 closer to the second communication port 13131 has a greater distance between the fourth end and the second inner wall 1318. In the process of the heat exchange medium passing through the second communication port 13131 and flowing to the medium outlet 132, the heat exchange medium can flow faster to the rest of the heat management component 13, thereby improving the heat exchange efficiency.

[0123] According to some embodiments of the present application, referring to FIGS. 3-8, the heat management component 13 further includes a fifth cavity 1319 and a sixth cavity 1320. The fifth cavity 1319 is located on the side of the second cavity 139 away from the first cavity 138 along the first direction X, and the sixth cavity 1320 is located on the side of the third cavity 1310 away from the fourth cavity 1311. The fifth cavity 1319 and the sixth cavity 1320 are not in communication with the flow channel.

[0124] In some embodiments, the fifth cavity 1319 and the sixth cavity 1320 can be isolated from the flow channel by the first inner wall 1317 and the second inner wall 1318.

[0125] In the above scheme, since the fifth cavity 1319 and the sixth cavity 1320 are not in communication with the flow channel, the heat management component 13 has a relatively low heat exchange efficiency region. Arranging the end battery monomer 12 in this region can help balance the temperature difference of the battery monomer assembly.

[0126] According to some embodiments of the present application, referring to FIGS. 3-8, the heat management component 13 includes a first profile 1321, a second profile 1322, a third profile 1323, a fourth profile 1324, a fifth profile 1325, and a sixth profile 1326. The first profile 1321 has the first cavity 138, the second profile 1322 has the second cavity 139, the third profile 1323 has the third cavity 1310, the fourth profile 1324 has the fourth cavity 1311, the fifth profile 1325 has the fifth cavity 1319, and the sixth profile 1326 has the sixth cavity 1320.

[0127] Since the profile naturally has multiple through cavities inside after being processed. In some embodiments, the above-mentioned flow channels can be machined at the end of the profile by machining or other methods. Please refer to FIGS. 5-8. Then, the flow channels through which the heat exchange medium flows are formed by cooperating with multiple partition plates to block the ends.

[0128] The partition plates used for blocking can be connected to the ends of the profile by welding.

[0129] In the above scheme, the heat management component 13 is formed by splicing profiles. The flow channels can be formed by the inherent configuration of the profile, which is low in cost and high in processing efficiency. At the same time, the heat management component 13 has a low deformation amount and high precision during processing.

[0130] According to some embodiments of the present application, referring to FIGS. 3-8, the orthographic projection of the second end battery cell 122 at least partially overlaps with the orthographic projection of the fifth cavity 1319 and / or the orthographic projection of the sixth cavity 1320 in the same projection plane perpendicular to the second direction Y.

[0131] Since the fifth cavity 1319 and the sixth cavity 1320 are not in communication with the flow channel, the second end battery cell 122 arranged correspondingly can have a lower heat exchange efficiency.

[0132] In the above scheme, the temperature difference between each battery cell 12 in the battery cell assembly is relatively small.

[0133] According to some embodiments of the present application, referring to FIGS. 3-8, among the plurality of battery cells 12, the two battery cells 12 at the two ends are respectively the first end battery cell 121 and the second end battery cell 122. The battery device 100 further comprises a first thermal insulation pad 14 arranged between the first end battery cell 121 and the thermal management component 13, and / or the battery device 100 further comprises a second thermal insulation pad arranged between the second end battery cell 122 and the thermal management component 13.

[0134] The material of the thermal insulation pad can include but is not limited to silicone, wood, plastic, polyurethane elastomer, ceramic, etc.

[0135] The thermal insulation pad can be arranged by bonding, fastener connection, etc.

[0136] In the above scheme, by arranging a thermal insulation pad between the battery cell 12 at the end and the thermal management component 13, the heat exchange efficiency of the thermal management component 13 on the battery cell 12 at the end can be reduced, so that the temperature difference between each battery cell 12 in the battery cell assembly is relatively small, and the risk of thermal stress concentration in the battery cell assembly is reduced.

[0137] According to some embodiments of the present application, referring to FIGS. 3-8, among the plurality of battery cells 12, the two battery cells 12 at the two ends are respectively the first end battery cell 121 and the second end battery cell 122. The battery device 100 further comprises a first limiting piece 15 and a second limiting piece 16, which are arranged at intervals along the first direction X, and the plurality of battery cells 12 are arranged between the first limiting piece 15 and the second limiting piece 16. The first end battery cell 121 is located at one end of the battery cell group close to the first limiting piece 15, and the second end battery cell 122 is located at one end of the battery cell group close to the second limiting piece 16.

[0138] The limiting piece can be an end plate of the battery cell assembly, or an expansion beam arranged in the battery device 100 for resisting the swelling deformation of the battery cell 12.

[0139] The material of the limiting member can be a fiber reinforced material, metal, or composite material, etc.

[0140] In the above scheme, the limiting member increases the heat exchange path between the end battery monomer 12 and the heat management component 13, and the heat exchange efficiency between the heat management component 13 and the battery monomer 12 at the end of the battery monomer assembly located at least one end along the first direction X is set to be less than the heat exchange efficiency of any battery monomer 12 located between the two ends along the first direction X, which can significantly reduce the risk of thermal stress concentration of the battery monomer assembly.

[0141] According to some embodiments of the present application, referring to FIGS. 3-8, the battery device 100 further comprises a third heat insulation pad arranged between the first limiting member 15 and the first end battery monomer 121; and / or, a fourth heat insulation pad arranged between the second limiting member 16 and the second end battery monomer 122.

[0142] The heat insulation pad can be arranged between the limiting member and the end battery monomer 12.

[0143] In the above scheme, by arranging the heat insulation pad between the limiting member and the end battery monomer 12, the heat exchange efficiency of the heat management component 13 to the end battery monomer 12 can be reduced, so that the temperature difference between each battery monomer 12 in the battery monomer assembly is relatively small, and the risk of thermal stress concentration of the battery monomer assembly is reduced.

[0144] According to some embodiments of the present application, referring to FIGS. 3-8, the material of the first limiting member 15 is metal, and / or the material of the second limiting member 16 is metal.

[0145] The material of the limiting member can include but is not limited to aluminum, steel, aluminum alloy, etc.

[0146] In the above scheme, since the limiting member made of metal has relatively high thermal conductivity, the heat exchange efficiency between the heat management component 13 and the battery monomer 12 at the end of the battery monomer assembly located at least one end along the first direction X is set to be less than the heat exchange efficiency of any battery monomer 12 located between the two ends along the first direction X, which can significantly reduce the risk of thermal stress concentration of the battery monomer assembly.

[0147] According to some embodiments of the present application, referring to FIG. 1, the present application provides a power consuming device, which comprises the battery device 100 of the above scheme, and the battery device 100 is used to provide electric energy.

[0148] The battery device 100 mentioned in the embodiments of the present application refers to a single physical module comprising one or more battery monomers 12 to provide higher voltage and capacity.

[0149] In some embodiments, the battery device 100 comprises a box 11.

[0150] In some embodiments, the battery device 100 can be a battery module, and when the battery monomers 12 are multiple, the multiple battery monomers 12 are arranged and fixed to form a battery module.

[0151] In some embodiments, the battery device 100 can be a battery pack, and the battery pack comprises the box 11 and the battery monomers 12, and the battery monomers 12 or the battery module are contained in the box 11.

[0152] In some embodiments, the box 11 can be part of the chassis structure of the vehicle 1000. For example, part of the box 11 can be at least part of the floor of the vehicle 1000, or part of the box 11 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0153] In some embodiments, the battery device 100 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0154] Since the battery device 100 of the above scheme has high reliability, the power utilization device comprising the battery device 100 of the above scheme also has high reliability.

[0155] According to some embodiments of the present application, referring to FIGS. 3-8, the present application provides a battery device 100, which comprises a battery monomer assembly and a thermal management component 13. The battery monomer assembly comprises a plurality of battery monomers 12 arranged along a first direction X. The thermal management component 13 is arranged on one side of the battery monomer assembly along a second direction Y intersecting the first direction X, and is used to adjust the temperature of the battery monomers 12. The thermal management component 13 has a flow channel containing a heat exchange medium. The thermal management component 13 further comprises a medium inlet 131 and a medium outlet 132, both of which are in communication with the flow channel. The orthographic projection of the battery monomer assembly on the thermal management component 13 is a first projection, and the medium inlet 131 and the medium outlet 132 are located on the same side of the first projection in the first direction X.

[0156] Among the plurality of battery monomers 12, the two battery monomers 12 at both ends are respectively a first end battery monomer 121 and a second end battery monomer 122. The battery device 100 further comprises a first expansion beam and a second expansion beam, which are arranged at intervals along the first direction X. The plurality of battery monomers 12 are arranged between the first expansion beam and the second expansion beam. The first end battery monomer 121 is located at one end of the battery monomer assembly close to the first expansion beam, and the second end battery monomer 122 is located at one end of the battery monomer assembly close to the second expansion beam.

[0157] The flow channel includes a first flow channel 133, a second flow channel 134, a third flow channel 135, a plurality of first branch flow channels 136, and a plurality of second branch flow channels 137. In the first direction X, the first flow channel 133 is arranged apart from the second flow channel 134, the first flow channel 133 is located between the medium inlet 131 and the second flow channel 134, the plurality of first branch flow channels 136 are arranged side by side between the first flow channel 133 and the second flow channel 134, and the medium inlet 131 is in communication with the first flow channel 133. In the first direction X, the second flow channel 134 is arranged apart from the third flow channel 135, the third flow channel 135 is located between the medium outlet 132 and the second flow channel 134, the plurality of second branch flow channels 137 are arranged side by side between the second flow channel 134 and the third flow channel 135, and the medium outlet 132 is in communication with the third flow channel 135. The thermal management component 13 has a first cavity 138, a second cavity 139, a third cavity 1310, and a fourth cavity 1311 in sequence. The medium inlet 131 is in communication with the first cavity 138, and the medium outlet 132 is in communication with the fourth cavity 1311. The first cavity 138 and the second cavity 139 are separated by a first partition plate 1312, and the first partition plate 1312 is provided with a first communication port 13121 for communicating the first cavity 138 and the second cavity 139. The second cavity 139 and the third cavity 1310 are separated by a second partition plate 1313, and the second partition plate 1313 is provided with a second communication port 13131 for communicating the second cavity 139 and the third cavity 1310. The third cavity 1310 and the fourth cavity 1311 are separated by a third partition plate 1314, and the third partition plate 1314 is provided with a third communication port 13141 for communicating the third cavity 1310 and the fourth cavity 1311. The second cavity 139 is divided into a plurality of first branch flow channels 136 by a plurality of fourth partition plates 1315, and the third cavity 1310 is divided into a plurality of second branch flow channels 137 by a plurality of fifth partition plates 1316. The thermal management component 13 further includes a fifth cavity 1319 and a sixth cavity 1320, the fifth cavity 1319 is located on the side of the second cavity 139 away from the first cavity 138 in the first direction X, the sixth cavity 1320 is located on the side of the third cavity 1310 away from the fourth cavity 1311, and the fifth cavity 1319 and the sixth cavity 1320 are not in communication with the flow channel. In the same projection plane perpendicular to the second direction Y, the orthographic projection of the second end battery cell 122 at least partially overlaps the orthographic projection of the fifth cavity 1319, and the orthographic projection of the second end battery cell 122 at least partially overlaps the orthographic projection of the sixth cavity 1320.

[0158] The battery device 100 further includes a first thermal insulation pad 14, a second thermal insulation pad, a third thermal insulation pad, and a fourth thermal insulation pad. The first thermal insulation pad 14 is disposed between the first end portion battery cell 121 and the thermal management member 13. The second thermal insulation pad is disposed between the second end portion battery cell 122 and the thermal management member 13. The third thermal insulation pad is disposed between the first expansion beam and the first end portion battery cell 121. The fourth thermal insulation pad is disposed between the second expansion beam and the second end portion battery cell 122.

[0159] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the present application; even though 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 recorded in the foregoing embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A battery device characterized by comprising: The application relates to a battery cell assembly and a heat management component thereof. The battery cell assembly comprises a plurality of battery cells arranged along a first direction; The heat management component is arranged on one side of the battery cell assembly along a second direction intersecting the first direction, and is used for adjusting the temperature of the battery cells; The heat exchange efficiency of the heat management component and the battery cell at the end of at least one end of the battery cell assembly along the first direction is less than the heat exchange efficiency of the heat management component and any battery cell between the two ends along the first direction. The battery device according to claim 1, wherein The heat management component has a flow channel containing a heat exchange medium; The heat management component further comprises a medium inlet and a medium outlet, both of which are in communication with the flow channel, and the normal projection of the battery cell assembly on the heat management component is a first projection, and the medium inlet and the medium outlet are located on the same side of the first projection in the first direction. The battery device according to claim 2, wherein Among the plurality of battery cells, the two battery cells at the two ends are respectively a first end battery cell and a second end battery cell; The first end battery cell is closer to the medium inlet and the medium outlet than the second end battery cell; The first end battery cell at least partially overlaps with the flow channel, and the second end battery cell does not overlap with the flow channel. The battery device according to claim 3, wherein The flow channel comprises a first flow channel, a second flow channel, a third flow channel, a plurality of first branch flow channels and a plurality of second branch flow channels; Along the first direction, the first flow channel is arranged at intervals with the second flow channel, the first flow channel is located between the medium inlet and the second flow channel, a plurality of first branch flow channels are arranged side by side between the first flow channel and the second flow channel, and the medium inlet is in communication with the first flow channel; Along the first direction, the second flow channel is arranged at intervals with the third flow channel, the third flow channel is located between the medium outlet and the second flow channel, a plurality of second branch flow channels are arranged side by side between the second flow channel and the third flow channel, and the medium outlet is in communication with the third flow channel. The battery device according to claim 4, wherein The heat management component has a first cavity, a second cavity, a third cavity and a fourth cavity in sequence; The medium inlet is in communication with the first cavity, and the medium outlet is in communication with the fourth cavity; The first cavity and the second cavity are separated by a first partition plate, and the first partition plate is provided with a first communication port in communication with the first cavity and the second cavity; The second cavity and the third cavity are separated by a second partition plate, and the second partition plate is provided with a second communication port in communication with the second cavity and the third cavity; The third cavity and the fourth cavity are separated by a third partition plate, and the third partition plate is provided with a third communication port in communication with the third cavity and the fourth cavity; The second cavity is divided into a plurality of first branch flow channels by a plurality of fourth partition plates, and the third cavity is divided into a plurality of second branch flow channels by a plurality of fifth partition plates. The battery device according to claim 5, wherein In the same projection plane perpendicular to the second direction, the normal projection of the first end battery cell at least partially overlaps with the normal projection of the first cavity; And / or, the first end battery cell has a positive projection that at least partially overlaps with a positive projection of the fourth cavity. The battery device according to claim 5 or 6, characterized in that In the same projection plane perpendicular to the second direction, a positive projection of each of the battery cells other than the first end battery cell and the second end battery cell at least partially overlaps with a positive projection of the second cavity; And / or, a positive projection of each of the battery cells other than the first end battery cell and the second end battery cell at least partially overlaps with a positive projection of the third cavity. The battery device according to any one of claims 5 to 7, characterized in that The fourth partition plate has a first end close to the first partition plate, and the first end is spaced apart from the first partition plate; Among the plurality of fourth partition plates, the closer the fourth partition plate is to the first communication port, the greater the distance between the first end of the fourth partition plate and the first partition plate. The battery device according to any one of claims 5 to 8, characterized in that The second cavity has a first inner wall opposite the first partition plate along the first direction; The fourth partition plate has a second end close to the first inner wall, and the second end is spaced apart from the first inner wall; Among the plurality of fourth partition plates, the closer the fourth partition plate is to the second communication port, the greater the distance between the second end of the fourth partition plate and the first inner wall. The fifth partition plate has a third end close to the third partition plate, and the third end is spaced apart from the third partition plate; The battery device according to any one of claims 5-9, characterized in that Among the plurality of fifth partition plates, the closer the fifth partition plate is to the third communication port, the greater the distance between the third end of the fifth partition plate and the fifth partition plate. The third cavity has a second inner wall opposite the fifth partition plate along the first direction; The battery device according to any one of claims 5-10, characterized in that The fifth partition plate has a fourth end close to the second inner wall, and the fourth end is spaced apart from the second inner wall; Among the plurality of fifth partition plates, the closer the fifth partition plate is to the second communication port, the greater the distance between the fourth end of the fifth partition plate and the second inner wall. The thermal management component further comprises a fifth cavity and a sixth cavity, the fifth cavity is located on the side of the second cavity away from the first cavity along the first direction, and the sixth cavity is located on the side of the third cavity away from the fourth cavity, and the fifth cavity and the sixth cavity are not communicated with the flow channel. The battery device according to any one of claims 5-11, characterized in that The thermal management component comprises a first profile, a second profile, a third profile, a fourth profile, a fifth profile and a sixth profile, the first profile has the first cavity, the second profile has the second cavity, the third profile has the third cavity, the fourth profile has the fourth cavity, the fifth profile has the fifth cavity, and the sixth profile has the sixth cavity. The battery device according to claim 12, wherein In the same projection plane perpendicular to the second direction, a positive projection of the second end battery cell at least partially overlaps with a positive projection of the fifth cavity; The battery device according to claim 12 or 13, characterized in that And / or, a positive projection of the second end battery cell at least partially overlaps with a positive projection of the sixth cavity. Among the plurality of battery cells, the two battery cells at both ends are respectively a first end battery cell and a second end battery cell; The battery device according to any one of claims 1-14, characterized in that The battery device further comprises a first thermal insulation pad, and the first thermal insulation pad is arranged between the first end battery cell and the thermal management component; ​ And / or, the battery device further comprises a second thermal insulation pad, which is arranged between the second end battery cell and the thermal management component. The battery device according to any one of claims 1 to 15, characterized in that Among the plurality of battery cells, two battery cells at both ends are respectively a first end battery cell and a second end battery cell. The battery device further comprises: A first limiting member and a second limiting member, the first limiting member and the second limiting member are arranged in the first direction, and a plurality of battery cells are arranged between the first limiting member and the second limiting member, the first end battery cell is located at one end of the battery cell group close to the first limiting member, and the second end battery cell is located at one end of the battery cell group close to the second limiting member. The battery device according to claim 16, wherein The battery device further comprises: A third thermal insulation pad, which is arranged between the first limiting member and the first end battery cell; and / or, A fourth thermal insulation pad, which is arranged between the second limiting member and the second end battery cell. The battery device according to claim 16 or 17, characterized in that The material of the first limiting member is metal, and / or the material of the second limiting member is metal. An electric power utilization device characterized by comprising: The battery device as claimed in any one of claims 1-18 is used to provide electric energy.

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