Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device has relatively high reliability. The battery device includes a battery cell assembly including a plurality of battery cells arranged in a first direction, and a thermal management component. And the heat management part is arranged on one side of the battery monomer group along a second direction and is used for adjusting the temperature of the battery monomers, and the second direction is intersected with the first direction. Wherein the heat exchange efficiency between the heat management component and the battery monomer at the end part of at least one of the two ends along the first direction of the battery monomer assembly is smaller than the heat exchange efficiency between the heat management component and any battery monomer positioned between the two ends along the first direction.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] How to improve the reliability of battery devices is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device comprising a battery cell assembly and a thermal management component, wherein the battery cell assembly comprises a plurality of battery cells arranged along a first direction. The thermal management component is disposed on one side of the battery cell assembly along a second direction intersecting the first direction and configured to regulate the temperature of the battery cells. The thermal management component has a heat exchange efficiency with a battery cell located at at least one of the ends of the battery cell assembly along the first direction that is less than the heat exchange efficiency with any battery cell located between the ends along the first direction.

[0006] In the above scheme, since the heat exchange efficiency between the thermal management component and the battery cell located at the end of at least one of the two ends of the battery cell assembly along the first direction is lower than the heat exchange efficiency with 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.

[0007] In one or more embodiments of the first aspect, the thermal management component includes a flow channel for accommodating a heat exchange medium. The thermal management component further includes a medium inlet and a medium outlet, both of which are connected to the flow channel. The orthographic projection of the battery cell 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.

[0008] 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 thermal management component and the battery cell at the end of at least one of the two ends of the battery cell assembly along the first direction is set to be lower than the heat exchange efficiency with any battery cell located between the two ends along the first direction, which can significantly reduce 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.

[0009] 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 with the flow channel, while the second end battery cell does not overlap with the flow channel.

[0010] In the above scheme, since the battery cell at the first end at least partially overlaps with the flow channel, and the battery cell at the second end does not overlap with the flow channel, the heat exchange efficiency of the battery cells at both ends is relatively low, and the heat exchange efficiency of the remaining battery cells is relatively high, which can make the temperature of all battery cells in the battery cell assembly not differ much during the heat exchange process, so that the overall temperature distribution of the battery cell assembly is relatively uniform.

[0011] In one or more embodiments of the first aspect, the flow channel includes a first confluence channel, a second confluence channel, a third confluence channel, a plurality of first branch channels, and a plurality of second branch channels. Along the first direction, the first confluence channel is spaced apart from the second confluence channel, the first confluence channel is located between the medium inlet and the second confluence channel, the plurality of first branch channels are arranged side by side between the first confluence channel and the second confluence channel, and the medium inlet is connected to the first confluence channel. Along the first direction, the second confluence channel is spaced apart from the third confluence channel, the third confluence channel is located between the medium outlet and the second confluence channel, the plurality of second branch channels are arranged side by side between the second confluence channel and the third confluence channel, and the medium outlet is connected to the third confluence channel.

[0012] In the above solution, subdividing the flow channel into a converging channel and a branching channel can further improve the uniformity of heat exchange of the heat exchange medium.

[0013] In one or more embodiments of the first aspect, the thermal management component comprises a first cavity, a second cavity, a third cavity, and a fourth cavity, which are 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, and the first partition is provided with a first connecting port connecting the first cavity and the second cavity. The second cavity and the third cavity are separated by a second partition, and the second partition is provided with a second connecting port connecting the second cavity and the third cavity. The third cavity and the fourth cavity are separated by a third partition, and the third partition is provided with a third connecting port connecting the third cavity and the fourth cavity. Multiple first branch channels are separated by multiple fourth partitions in the second cavity, and multiple second branch channels are separated by multiple fifth partitions in the third cavity.

[0014] In the above solution, different cavities are connected to the medium inlet and the medium outlet in sequence by providing a partition and providing a communication port on the partition, which reduces the processing cost and improves the processing efficiency.

[0015] In one or more embodiments of the first aspect, within the same projection plane perpendicular to the second direction, the orthographic projection of the first end battery cell at least partially overlaps with the orthographic projection of the first cavity; and / or the orthographic projection of the first end battery cell at least partially overlaps with the orthographic projection of the fourth cavity.

[0016] In the above scheme, since the first cavity is provided with only a medium inlet and the fourth cavity is provided with only a medium outlet, the heat exchange efficiency of the heat exchange medium in the first cavity and the fourth cavity is relatively low. In the same projection plane perpendicular to the second direction, the orthographic projection of the battery cell at the first end is set to at least partially overlap with the orthographic projection of the first cavity, and / or the orthographic projection of the fourth cavity is at least partially overlapped. This can keep the heat exchange efficiency of the battery cell at the first end at a relatively low state, which is beneficial to balancing the temperature difference of the battery cell assembly.

[0017] In one or more embodiments of the first aspect, within the same projection plane perpendicular to the second direction, among the multiple battery cells, the orthographic projections of the battery cells other than the first end battery cell and the second end battery cell all at least partially overlap with the orthographic projection of the second cavity; and / or, the orthographic projections of the battery cells other than the first end battery cell and the second end battery cell all at least partially overlap with the orthographic projection of the third cavity.

[0018] In the above scheme, since the heat exchange area of ​​the flow channels in the second cavity and the third cavity is relatively large, in the same projection plane perpendicular to the second direction, the orthographic projections of the battery cells other than the first end battery cell and the second end battery cell are set to at least partially overlap with the orthographic projection of the second cavity, and / or the orthographic projection of the third cavity at least partially overlap, so that the heat exchange efficiency of the other battery cells is higher than that of the end battery cells, which is beneficial to balancing the temperature difference of the battery cell assembly.

[0019] In one or more embodiments of the first aspect, the fourth partition has a first end proximate to the first partition, and the first end is spaced apart from the first partition. Among the plurality of fourth partitions, the closer the fourth partition is to the first communication port, the greater the distance between the first end and the first partition.

[0020] In the above scheme, since the closer the fourth partition is to the first connecting port, the greater the distance between its first end and the first partition, in the process of the heat exchange medium passing through the first connecting port and flowing to the medium outlet, the heat exchange medium can flow to the rest of the thermal management component faster, thereby improving the heat exchange efficiency.

[0021] In one or more embodiments of the first aspect, the second chamber has a first inner wall opposite the first partition along the first direction. The fourth partition has a second end proximate to the first inner wall, the second end being spaced apart from the first inner wall. Among the plurality of fourth partitions, the closer the fourth partition is to the second communication opening, the greater the distance between its second end and the first inner wall.

[0022] In the above scheme, since the closer the fourth partition is to the second connecting port, the greater the distance between its second end and the first inner wall, in the process of the heat exchange medium passing through the second connecting port and flowing to the medium outlet, the heat exchange medium can flow to the rest of the thermal management component faster, thereby improving the heat exchange efficiency.

[0023] In one or more embodiments of the first aspect, the fifth partition has a third end proximal to the third partition, and the third end is spaced apart from the third partition. Among the plurality of fifth partitions, the closer the fifth partition is to the third communication port, the greater the distance between the third end and the fifth partition.

[0024] In the above solution, since the closer the fifth partition is to the third connecting port, the greater the distance between its third end and the fifth partition, the heat exchange medium can pass through the third connecting port and flow to the medium outlet faster, thereby improving heat exchange efficiency.

[0025] In one or more embodiments of the first aspect, the third chamber has a second inner wall opposite the fifth partition along the first direction. The fifth partition has a fourth end proximate to the second inner wall, the fourth end being spaced apart from the second inner wall. Among the plurality of fifth partitions, the closer the fifth partition is to the second communication opening, the greater the distance between the fourth end and the second inner wall.

[0026] In the above scheme, since the closer the fifth partition is to the second connecting port, the greater the distance between its fourth end and the second inner wall, in the process of the heat exchange medium passing through the second connecting port and flowing to the medium outlet, the heat exchange medium can flow to the rest of the thermal management component faster, thereby improving the heat exchange efficiency.

[0027] In one or more embodiments of the first aspect, the thermal management component further includes a fifth cavity and a sixth cavity. Along the first direction, the fifth cavity is located on the side of the second cavity away from the first cavity, and the sixth cavity is located on the side of the third cavity away from the fourth cavity. The fifth cavity and the sixth cavity are not connected to the flow channel.

[0028] In the above solution, since the fifth and sixth cavities are not connected to the flow channel, the thermal management component has an area with relatively low heat exchange efficiency. Arranging the end battery cells in this area is conducive to balancing the temperature difference of the battery cell assembly.

[0029] In one or more embodiments of the first aspect, the thermal management component includes a first profile, a second profile, a third profile, a fourth profile, a fifth profile and a sixth profile that are separately formed, the first profile having a first cavity, the second profile having a second cavity, the third profile having a third cavity, the fourth profile having a fourth cavity, the fifth profile having a fifth cavity, and the sixth profile having a sixth cavity.

[0030] In this solution, the thermal management component is formed by splicing profiles together, utilizing the inherent internal configuration of the profiles to form the flow channel. This approach reduces costs and improves processing efficiency. Furthermore, the thermal management component exhibits minimal deformation during processing, resulting in high precision.

[0031] In one or more embodiments of the first aspect, within 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.

[0032] In the above solution, since the fifth cavity and the sixth cavity are not connected to the flow channel, the corresponding second end battery cells can have a lower heat exchange efficiency, thereby making the temperature difference between the battery cells in the battery cell assembly relatively small.

[0033] 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 battery device further includes a first thermal insulation pad disposed between the first end battery cell and the thermal management component; and / or the battery device further includes a second thermal insulation pad disposed between the second end battery cell and the thermal management component.

[0034] In the above scheme, by arranging a thermal insulation pad between the battery cell at the end and the thermal management component, the heat exchange efficiency of the thermal management component to the battery cell at the end can be reduced, so that the temperature difference between the battery cells in the battery cell assembly is relatively small, thereby reducing the risk of thermal stress concentration in the battery cell assembly.

[0035] In one or more embodiments of the first aspect, among the multiple 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 battery device further includes a first limiter and a second limiter, the first limiter and the second limiter being spaced apart along a first direction, the multiple battery cells being disposed between the first limiter and the second limiter, the first end battery cell being located at an end of the battery cell group proximate to the first limiter, and the second end battery cell being located at an end of the battery cell group proximate to the second limiter.

[0036] In the above scheme, the limiter increases the heat exchange path between the battery cells at the end and the thermal management component, and sets the heat exchange efficiency between the thermal management component and the battery cells at the end of at least one of the two ends of the battery cell assembly along the first direction to be lower than the heat exchange efficiency with any battery cell located between the two ends along the first direction, which can significantly reduce the risk of thermal stress concentration in the battery cell assembly.

[0037] In one or more embodiments of the first aspect, the battery device further includes a third thermal insulation pad, which is arranged between the first limiter and the first end battery cell; and / or a fourth thermal insulation pad, which is arranged between the second limiter and the second end battery cell.

[0038] In the above scheme, by arranging a thermal insulation pad between the limiter and the battery cell at the end, the heat exchange efficiency of the thermal management component to the battery cell at the end can be reduced, so that the temperature difference between the battery cells in the battery cell assembly is relatively small, reducing the risk of thermal stress concentration in the battery cell assembly.

[0039] 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.

[0040] In the above scheme, since the thermal conductivity of the metal limiter is relatively high, the heat exchange efficiency of the thermal management component and the battery cell at the end of at least one of the two ends of the battery cell assembly along the first direction is set to be lower than the heat exchange efficiency of any battery cell located between the two ends along the first direction, which can significantly reduce the risk of thermal stress concentration in the battery cell assembly.

[0041] In a second aspect, the present application provides an electrical device, comprising a battery device according to the above-mentioned solution, and the battery device is used to provide electrical energy.

[0042] Since the battery device of the above solution has high reliability, the electrical device including the battery device of the above solution also has high reliability.

[0043] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0045] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0046] Figure 2 An exploded view of a battery device according to some embodiments of the present application;

[0047] Figure 3This is an isometric view of a partial structure of a battery device according to some embodiments of the present application;

[0048] Figure 4 Axonometric views of partial structures of battery devices according to other embodiments of the present application;

[0049] Figure 5 This is a schematic structural diagram of a thermal management component in some embodiments of the present application;

[0050] Figure 6 A cross-sectional view of a thermal management component according to some embodiments of the present application;

[0051] Figure 7 for Figure 6 A partial enlarged view of point A in the middle;

[0052] Figure 8 for Figure 6 A partial enlarged view of point B in the middle.

[0053] The accompanying drawings in the specific implementation manner are as follows:

[0054] 1000-vehicle; 200-controller; 300-motor; 100-battery device; 11-housing; 111-first housing; 112-second housing; 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 bus; 134-second bus; 135-third bus; 136-first branch; 137-second branch; 138-first chamber; 139-second chamber; 1310-third chamber; 1311-fourth chamber; 1312-first partition; 13 121-first connecting port; 1313-second partition; 13131-second connecting port; 1314-third partition; 13141-third connecting port; 1315-fourth partition; 1316-fifth partition; 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 limiter; 16-second limiter; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0055] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection 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 terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Unless otherwise required by context, the use herein of the singular is also to be construed as a use of the plural and vice versa.

[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 "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0058] Reference herein to "an embodiment" 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 appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments, and is not necessarily used consistently throughout. It will be explicitly understood by one of ordinary skill in the art that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

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

[0061] The battery device (Battery Apparatus) referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery monomers connected in series, in parallel or in a hybrid connection through a busbar component.

[0062] In some embodiments, a 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, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0063] In some embodiments, the battery device can be a battery pack, which includes a case and one or more battery cell assemblies, the battery cell assemblies are accommodated in the case.

[0064] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case by fixing the battery module in the case.

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

[0066] Hereinafter, the embodiments described below will mainly be described with respect to a cuboid battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or pouch battery cells or blade battery cells 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, the end cap closes the opening of the case to define an accommodation space for accommodating 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 cells at the end of the battery cell assembly and the remaining battery cells in the general battery cell assembly, which can cause a large 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 undesirable 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 thermal management component, wherein the battery cell assembly includes a plurality of battery cells arranged along a first direction. The thermal 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 cells, and the second direction intersects with the first direction. The heat exchange efficiency between the thermal management component and the battery cells at the end of at least one of the two ends of the battery cell assembly along the first direction is less than the heat exchange efficiency between the thermal management component and the battery cells at the end of at least one of the two ends along the first direction. Since the heat exchange efficiency between the thermal management component and the battery cells at the end of at least one of the two ends of the battery cell assembly along the first direction is less than the heat exchange efficiency between the thermal management component and the battery cells at the end of at least one of 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 electrical devices using the battery devices.

[0072] Electrical devices include, but are not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0073] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0074] For example, Figure 1 Schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A motor 300, a controller 200 and a battery device 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, for example, for the starting, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] In order to meet different power requirements, the battery device 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection, where hybrid connection refers to a mixture of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery device 100. In other words, multiple battery cells 12 may directly form the battery device 100, or they may first form a battery module, and then the battery modules may form the battery device 100.

[0076] For example, see Figure 2 , Figure 2 FIG1 is an exploded view of a battery device 100 according to some embodiments of the present application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may further include a housing 11. The interior of the housing 11 is a hollow structure, and the plurality of battery cells 12 are accommodated in the housing 11. Figure 2 As shown, they are respectively referred to as the first box body 111 and the second box body 112, and the first box body 111 and the second box body 112 are buckled together. The shapes of the first box body 111 and the second box body 112 can be determined according to the shape of the combination of multiple battery cells 12, and the first box body 111 and the second box body 112 can both have an open surface. For example, the first box body 111 and the second box body 112 can both be hollow rectangular parallelepipeds and each has only one open surface. The open surface of the first box body 111 and the open surface of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed chamber. Multiple battery cells 12 are connected in parallel, in series, or in mixed combination and placed in the box body 11 formed by the buckling of the first box body 111 and the second box body 112.

[0077] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 12 by connecting the electrode terminals of the battery cells 12. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the box 11 through a conductive mechanism.

[0078] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel or in a mixed manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery device 100 may include multiple battery modules, which can be connected in series, parallel or in a mixed manner.

[0079] According to some embodiments of the present application, referring to Figure 3-Figure 8 The present application provides a battery device 100, which includes a battery cell assembly and a thermal management component 13. The battery cell assembly includes a plurality of battery cells 12 arranged along a first direction X. The thermal management component 13 is disposed on one side of the battery cell assembly 12 along a second direction Y, and is configured to regulate the temperature of the battery cells 12. The second direction Y intersects the first direction X. The thermal management component 13 has a heat exchange efficiency with a battery cell 12 located at at least one of the two ends of the battery cell assembly along the first direction X that is lower than the heat exchange efficiency with any battery cell 12 located between the two ends along the first direction X.

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

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

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

[0083] In some embodiments, the plurality of battery cells 12 may be secured by straps.

[0084] In some embodiments, the plurality of battery cells 12 may be secured by a holding strip.

[0085] The heat transfer efficiency can be determined by measuring the temperature and flow rate of the medium and calculating the heat input and output of the medium. The heat transfer coefficient can also be calculated by measuring the temperature difference and heat transfer area of ​​the medium, thereby determining the heat transfer efficiency. The heat transfer efficiency can also be determined by establishing a mathematical model, simulating the heat transfer process, and predicting the heat transfer effect. Of course, thermal imaging technology can also be used to detect heat transfer efficiency.

[0086] In the above scheme, since the heat exchange efficiency between the thermal management component 13 and the battery cell 12 at the end of at least one of the two ends of the battery cell assembly along the first direction X is lower than the heat exchange efficiency between the thermal management component 13 and any battery cell 12 located between the two ends along the first direction X, 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 100 is higher.

[0087] According to some embodiments of the present application, referring to Figure 3-Figure 8 The thermal management component 13 has a flow channel for accommodating a heat exchange medium. The thermal management component 13 also includes a medium inlet 131 and a medium outlet 132. Both the medium inlet 131 and the medium outlet 132 are connected to the flow channel. The orthographic projection of the battery cell assembly on the thermal management component 13 is a first projection. 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 runner can be formed by machining, injection molding, casting, 3D printing, welding, etc.

[0090] The following description will use the heat exchange area of ​​the flow channel or the location of the thermal insulation pad as an example. The other methods of adjusting the heat exchange efficiency mentioned above can be adaptively adapted to the corresponding characteristics.

[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 cell 12 and is conducive to improving the energy density of the battery device 100.

[0092] In the above solution, because the medium inlet 131 and the medium outlet 132 are located on the same side of the first projection in the first direction X, there is a higher risk of a significant temperature difference between the end battery cells 12 near the medium inlet 131 and the medium outlet 132 and the remaining battery cells 12. By setting the heat exchange efficiency between the thermal management component 13 and the battery cells 12 at the end of at least one of the two ends of the battery cell assembly along the first direction X to be lower than the heat exchange efficiency between the thermal management component 13 and any battery cells 12 located between the two ends along the first direction X, the risk of thermal stress concentration in the battery cell assembly due to a significant temperature difference between the end battery cells 12 and the remaining battery cells 12 can be significantly reduced.

[0093] According to some embodiments of the present application, referring to Figure 3-Figure 8 Among the multiple battery cells 12, the two battery cells 12 at the 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 with the flow channel, while the second end battery cell 122 does not overlap with the flow channel.

[0094] In some embodiments, the battery cell 12 located between the first end battery cell 121 and the second end battery cell 122 along the first direction X among the multiple battery cells 12 is a middle battery cell 12, and the area of ​​the second end battery cell 122 overlapping with the flow channel is smaller than the area of ​​the first end battery cell 121 overlapping with the flow channel, and the area of ​​the first end battery cell 121 overlapping with the flow channel is smaller than the area of ​​the middle battery cell 12 overlapping with the flow channel.

[0095] In the above scheme, since the battery cell 121 at the first end at least partially overlaps with the flow channel, and the battery cell 122 at the second end does not overlap with the flow channel, the heat exchange efficiency of the battery cells 12 at both ends is relatively low, and the heat exchange efficiency of the remaining battery cells 12 is relatively high, so that the temperature of all battery cells 12 in the battery cell assembly is not much different during the heat exchange process, so that the overall temperature distribution of the battery cell assembly is relatively uniform.

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

[0097] The first converging channel 133 , the second converging channel 134 , the third converging channel 135 , the plurality of first branch channels 136 and the plurality of second branch channels 137 may all extend along straight lines, broken lines, arcs, etc. In other words, the specific configuration of each channel is not limited.

[0098] In the above solution, subdividing the flow channel into a converging channel and a branching channel can further improve the uniformity of heat exchange of the heat exchange medium.

[0099] According to some embodiments of the present application, referring to Figure 3-Figure 8 The thermal management component 13 has a first cavity 138, a second cavity 139, a third cavity 1310, and a fourth cavity 1311 that are connected in sequence. The medium inlet 131 is connected to the first cavity 138, and the medium outlet 132 is connected to the fourth cavity 1311. The first cavity 138 and the second cavity 139 are separated by a first partition 1312. The first partition 1312 is provided with a first communication port 13121 that connects the first cavity 138 and the second cavity 139. The second cavity 139 and the third cavity 1310 are separated by a second partition 1313. The second partition 1313 is provided with a second communication port 13131 that connects the second cavity 139 and the third cavity 1310. The third cavity 1310 and the fourth cavity 1311 are separated by a third partition 1314. The third partition 1314 is provided with a third communication port 13141 that connects the third cavity 1310 and the fourth cavity 1311. A plurality of first branch channels 136 are separated in the second cavity 139 by a plurality of fourth partitions 1315 , and a plurality of second branch channels 137 are separated in the third cavity 1310 by a plurality of fifth partitions 1316 .

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

[0101] Likewise, the configuration of each cavity is not particularly limited.

[0102] In the above solution, different cavities are sequentially connected between the medium inlet 131 and the medium outlet 132 by providing a partition and providing a communication port on the partition, which reduces the processing cost and improves the processing efficiency.

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

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

[0105] In the above scheme, within the same projection plane perpendicular to the second direction Y, the orthographic projection of the first end battery cell 121 is set to at least partially overlap with the orthographic projection of the first cavity 138, and / or the orthographic projection of the fourth cavity 1311 is at least partially overlapped, so that the heat exchange efficiency of the first end battery cell 121 can be maintained at a low state, which is conducive to balancing the temperature difference of the battery cell assembly.

[0106] According to some embodiments of the present application, referring to Figure 3-Figure 8 , within the same projection plane perpendicular to the second direction Y, the orthographic projections of the multiple battery cells 12 except the first end battery cell 121 and the second end battery cell 122 all at least partially overlap with the orthographic projection of the second cavity 139; and / or, the orthographic projections of the other battery cells 12 except the first end battery cell 121 and the second end battery cell 122 all at least partially overlap with the orthographic projection of the third cavity 1310.

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

[0108] In the above scheme, within the same projection plane perpendicular to the second direction Y, the orthographic projections of the other battery cells 12 except the first end battery cell 121 and the second end battery cell 122 are set to at least partially overlap with the orthographic projection of the second cavity 139, and / or the orthographic projection of the third cavity 1310 at least partially overlap, so that the heat exchange efficiency of the other battery cells 12 is higher than that of the end battery cells 12, which is beneficial to balancing the temperature difference of the battery cell assembly.

[0109] According to some embodiments of the present application, referring to Figure 3-Figure 8The 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 and the first partition plate 1312.

[0110] The interval area between the first end and the first partition plate 1312 is wedge-shaped, which can guide and balance the flow, so that the heat exchange medium can be distributed more quickly and evenly.

[0111] In the above scheme, since the closer the fourth partition 1315 is to the first connecting port 13121, the greater the distance between its first end and the first partition 1312, in the process of the heat exchange medium passing through the first connecting port 13121 and flowing to the medium outlet 132, the heat exchange medium can flow to the rest of the thermal management component 13 faster, thereby improving the heat exchange efficiency.

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

[0113] The interval area between the first end and the second partition plate 1313 is wedge-shaped, which can distribute the heat exchange medium more quickly and evenly due to the effects of flow diversion and flow balance.

[0114] In the above scheme, since the closer the fourth partition 1315 is to the second connecting port 13131, the greater the distance between its second end and the first inner wall 1317, in the process of the heat exchange medium passing through the second connecting port 13131 and flowing to the medium outlet 132, the heat exchange medium can flow to the rest of the thermal management component 13 faster, thereby improving the heat exchange efficiency.

[0115] According to some embodiments of the present application, referring to Figure 3-Figure 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 and the fifth partition plate 1316.

[0116] The interval area between the third end and the fifth partition plate 1316 is wedge-shaped, which can distribute the heat exchange medium more quickly and evenly due to the effects of flow diversion and flow balance.

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

[0118] In the above solution, since the closer the fifth partition 1316 is to the third connecting port 13141, the greater the distance between its third end and the fifth partition 1316, the heat exchange medium can pass through the third connecting port 13141 faster and flow to the medium outlet 132, thereby improving the heat exchange efficiency.

[0119] According to some embodiments of the present application, referring to Figure 3-Figure 8 Along the first direction X, the third chamber 1310 has a second inner wall 1318 opposite the fifth partition 1316. The fifth partition 1316 has a fourth end proximate to the second inner wall 1318, and the fourth end is spaced apart from the second inner wall 1318. Among the plurality of fifth partitions 1316, the closer the fifth partition 1316 is to the second communication port 13131, the greater the distance between its fourth end 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 area between the fourth end and the second inner wall 1318 is wedge-shaped, which can guide and evenly distribute the heat exchange medium more quickly.

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

[0123] According to some embodiments of the present application, referring to Figure 3-Figure 8 The thermal management component 13 also includes a fifth cavity 1319 and a sixth cavity 1320. Along the first direction X, the fifth cavity 1319 is located on the side of the second cavity 139 away from the first cavity 138, 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 connected to the flow channel.

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

[0125] In the above solution, since the fifth cavity 1319 and the sixth cavity 1320 are not connected to the flow channel, the thermal management component 13 has an area with relatively low heat exchange efficiency. Arranging the end battery cells 12 in this area is conducive to balancing the temperature difference of the battery cell assembly.

[0126] According to some embodiments of the present application, referring to Figure 3-Figure 8The thermal 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, which are separately molded. The first profile 1321 has a first cavity 138, the second profile 1322 has a second cavity 139, the third profile 1323 has a third cavity 1310, the fourth profile 1324 has a fourth cavity 1311, the fifth profile 1325 has a fifth cavity 1319, and the sixth profile 1326 has a sixth cavity 1320.

[0127] Since the profile naturally has multiple through cavities after processing, in some embodiments, the above-mentioned flow channels can be processed at the end of the profile by machining, etc., please refer to Figure 5-Figure 8 , and then use multiple partitions to block the ends to form a flow channel for the heat exchange medium to flow through.

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

[0129] In the above solution, the thermal management component 13 is formed by splicing profiles, and the inherent internal configuration of the profiles can be used to form the flow channel, which is low in cost and high in processing efficiency. At the same time, the thermal management component 13 has low deformation during processing and high precision.

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

[0131] Since the fifth cavity 1319 and the sixth cavity 1320 are not connected to the flow channel, the corresponding second end battery cells 122 may have a lower heat exchange efficiency.

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

[0133] According to some embodiments of the present application, referring to Figure 3-Figure 8 Among the multiple battery cells 12, the two battery cells 12 located at the two ends are respectively a first end battery cell 121 and a second end battery cell 122. The battery device 100 further includes a first thermal insulation pad 14, which is disposed between the first end battery cell 121 and the thermal management component 13; and / or the battery device 100 further includes a second thermal insulation pad, which is disposed between the second end battery cell 122 and the thermal management component 13.

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

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

[0136] In the above scheme, by arranging the heat insulation pad between the battery monomer 12 at the end and the thermal management component 13, the heat exchange efficiency of the thermal management component 13 on the battery monomer 12 at the end can be reduced, 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.

[0137] According to some embodiments of the present application, referring to Figure 3-Figure 8 , of the plurality of battery monomers 12, 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 limiting piece 15 and a second limiting piece 16, the first limiting piece 15 and the second limiting piece 16 are arranged at intervals along the first direction X, the plurality of battery monomers 12 are arranged between the first limiting piece 15 and the second limiting piece 16, the first end battery monomer 121 is located at one end of the group of battery monomers 12 close to the first limiting piece 15, and the second end battery monomer 122 is located at one end of the group of battery monomers 12 close to the second limiting piece 16.

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

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

[0140] In the above scheme, the limiting piece increases the heat exchange path of the battery monomer 12 at the end and the thermal management component 13, and sets the heat exchange efficiency of the thermal management component 13 and the battery monomer 12 at the end of at least one end of the group of battery monomers 12 along the first direction X 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 Figure 3-Figure 8 , the battery device 100 further comprises a third heat insulation pad arranged between the first limiting piece 15 and the first end battery monomer 121; and / or a fourth heat insulation pad arranged between the second limiting piece 16 and the second end battery monomer 122.

[0142] The heat insulation pad can be arranged in the limiting piece or in the battery monomer 12 at the end.

[0143] In the above scheme, by arranging the heat insulation pad between the limiting member and the battery monomer 12 at the end, the heat exchange efficiency of the thermal management component 13 on the battery monomer 12 at the end can be reduced, 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 Figure 3-Figure 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 of the thermal 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. The risk of thermal stress concentration of the battery monomer assembly can be significantly reduced.

[0147] According to some embodiments of the present application, referring to Figure 1 , the present application provides a power utilization device, which includes the battery device 100 in 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 including one or more battery monomers 12 to provide higher voltage and capacity.

[0149] In some embodiments, the battery device 100 includes the 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 includes 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 solution has high reliability, the electrical device including the battery device 100 of the above solution also has high reliability.

[0155] According to some embodiments of this application, please refer to Figure 3-Figure 8 The present application provides a battery device 100, which includes a battery cell assembly and a thermal management component 13. The battery cell assembly includes 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 12 group along a second direction Y, and is used to adjust the temperature of the battery cell 12. The second direction Y intersects with the first direction X. The thermal management component 13 has a flow channel for accommodating a heat exchange medium. The thermal management component 13 also includes a medium inlet 131 and a medium outlet 132. The medium inlet 131 and the medium outlet 132 are both connected to the flow channel. The orthographic projection of the battery cell assembly on the thermal management component 13 is a first projection. 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 multiple battery cells 12, the two battery cells 12 located at the two ends are respectively a first end battery cell 121 and a second end battery cell 122. The battery device 100 also includes a first expansion beam and a second expansion beam, which are spaced apart along a first direction X. The multiple battery cells 12 are arranged between the first expansion beam and the second expansion beam. The first end battery cell 121 is located at one end of the battery cell 12 group near the first expansion beam, and the second end battery cell 122 is located at one end of the battery cell 12 group near the second expansion beam.

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

1. A battery device, characterized in that: include: A battery cell assembly comprising a plurality of battery cells arranged along a first direction; a thermal management component, the thermal management component being disposed on one side of the battery cell group along a second direction intersecting the first direction, for regulating the temperature of the battery cells; The heat exchange efficiency between the thermal management component and the battery cells at at least one end of the battery cell assembly along the first direction is lower than the heat exchange efficiency between the thermal management component and any battery cells located between the two ends along the first direction.

2. The battery device according to claim 1, wherein: The thermal management component has a flow channel for accommodating a heat exchange medium; The thermal management component further includes a medium inlet and a medium outlet, both of which are connected to the flow channel. The orthographic projection of the battery cell 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.

3. The battery device according to claim 2, characterized in that Among the plurality of battery cells, the two battery cells located at both 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.

4. The battery device according to claim 3, characterized in that The flow channel includes a first converging channel, a second converging channel, a third converging channel, a plurality of first branch flow channels and a plurality of second branch flow channels; Along the first direction, the first confluence channel and the second confluence channel are spaced apart, the first confluence channel is located between the medium inlet and the second confluence channel, a plurality of the first branch channels are arranged side by side between the first confluence channel and the second confluence channel, and the medium inlet is connected to the first confluence channel; Along the first direction, the second confluence channel and the third confluence channel are arranged at intervals, the third confluence channel is located between the medium outlet and the second confluence channel, a plurality of second branch channels are arranged side by side between the second confluence channel and the third confluence channel, and the medium outlet is connected to the third confluence channel.

5. The battery device according to claim 4, characterized in that The thermal management component has a first cavity, a second cavity, a third cavity and a fourth cavity which are connected in sequence; The medium inlet is communicated with the first cavity, and the medium outlet is communicated with the fourth cavity; The first cavity and the second cavity are separated by a first partition plate, and a first communication port is provided on the first partition plate to connect the first cavity and the second cavity; The second chamber and the third chamber are separated by a second partition plate, and a second communication port is provided on the second partition plate to connect the second chamber and the third chamber; The third chamber and the fourth chamber are separated by a third partition plate, and the third partition plate is provided with a third communication port connecting the third chamber and the fourth chamber; The second cavity is divided into a plurality of first branch channels by a plurality of fourth partitions, and the third cavity is divided into a plurality of second branch channels by a plurality of fifth partitions.

6. The battery device according to claim 5, characterized in that In the same projection plane perpendicular to the second direction, the orthographic projection of the first end battery cell and the orthographic projection of the first cavity at least partially overlap; And / or, the orthographic projection of the first end battery cell at least partially overlaps with the orthographic projection of the fourth cavity.

7. The battery device according to claim 5, characterized in that In the same projection plane perpendicular to the second direction, the orthographic projections of the battery cells except the first end battery cell and the second end battery cell among the plurality of battery cells at least partially overlap with the orthographic projection of the second cavity; And / or, orthographic projections of the battery cells except the first end battery cell and the second end battery cell at least partially overlap with the orthographic projection of the third cavity.

8. The battery device according to claim 5, characterized in that The fourth partition has a first end close to the first partition, and the first end is spaced apart from the first partition; Among the plurality of fourth partitions, the closer the fourth partition is to the first communication port, the greater the distance between the first end and the first partition.

9. The battery device according to claim 5, characterized in that Along the first direction, the second cavity has a first inner wall opposite to the first partition; The fourth partition 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 partitions, the closer the fourth partition is to the second communication port, the greater the distance between the second end and the first inner wall.

10. The battery device according to claim 5, characterized in that The fifth partition has a third end close to the third partition, and the third end is spaced apart from the third partition; Among the plurality of fifth partitions, the closer the fifth partition is to the third communication port, the greater the distance between the third end and the fifth partition.

11. The battery device according to claim 5, characterized in that Along the first direction, the third cavity has a second inner wall opposite to the fifth partition; The fifth partition 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 partitions, the closer the fifth partition is to the second communication port, the greater the distance between the fourth end and the second inner wall.

12. The battery device according to claim 5, characterized in that The thermal management component also includes a fifth cavity and a sixth cavity. Along the first direction, the fifth cavity is located on a side of the second cavity away from the first cavity, and the sixth cavity is located on a side of the third cavity away from the fourth cavity. The fifth cavity and the sixth cavity are not connected to the flow channel.

13. The battery device according to claim 12, characterized in that The thermal management component includes a first profile, a second profile, a third profile, a fourth profile, a fifth profile and a sixth profile that 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.

14. The battery device according to claim 12, wherein: In the same projection plane perpendicular to the second direction, the orthographic projection of the second end battery cell and the orthographic projection of the fifth cavity at least partially overlap; And / or, the orthographic projection of the second end battery cell at least partially overlaps with the orthographic projection of the sixth cavity.

15. The battery device according to claim 1, wherein: Among the plurality of battery cells, the two battery cells located at both ends are respectively a first end battery cell and a second end battery cell; The battery device further includes a first thermal insulation pad disposed between the first end battery cell and the thermal management component; And / or, the battery device further includes a second thermal insulation pad, which is disposed between the second end battery cell and the thermal management component.

16. The battery device according to claim 1, wherein: Among the plurality of battery cells, the two battery cells located at both ends are respectively a first end battery cell and a second end battery cell; The battery device further comprises: A first limiter and a second limiter are arranged at intervals along the first direction, and the battery cells are arranged between the first limiter and the second limiter. The first end battery cell is located at one end of the battery cell group close to the first limiter, and the second end battery cell is located at one end of the battery cell group close to the second limiter.

17. The battery device according to claim 16, characterized in that The battery device further comprises: a third thermal insulation pad, the third thermal insulation pad being disposed between the first limiting member and the first end battery cell; and / or, A fourth thermal insulation pad is provided between the second limiting member and the second end battery cell.

18. The battery device according to claim 16, wherein: The first limiting member is made of metal, and / or the second limiting member is made of metal.

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

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