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 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. The battery device has relatively high reliability.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to PCT patent application PCT / CN2024 / 108993 entitled “Battery Device and Electrical Device”, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] Improving the reliability of battery devices is a pressing issue in battery technology. Utility Model Content

[0006] In view of the above problems, this application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0007] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a thermal management component. The battery cell assembly includes 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, and is used to regulate the temperature of the battery cells. The second direction intersects the first direction. The heat exchange efficiency between the thermal management component and the battery cells located at at least one end of the battery cell assembly along 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 along the first direction.

[0008] In the above scheme, since the heat exchange efficiency of the battery cell at at least one end of the battery cell assembly along the first direction is less than that 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.

[0009] In one or more embodiments of the first aspect, the plurality of battery cells includes at least one first battery cell and at least one second battery cell. A first heat insulation pad is disposed between the first battery cell and the thermal management component, and no first heat insulation pad is disposed between the second battery cell and the thermal management component. The at least one first battery cell is a battery cell at the end of the battery cell assembly, and the at least one second battery cell is a battery cell located between the two ends of the battery cell assembly along the first direction.

[0010] In the above scheme, by adjusting the heat exchange efficiency between the first and second battery monomers and the heat management component through the presence or absence of the first thermal insulation pad, the temperature distribution of the battery monomer assembly as a whole can be relatively uniform, reducing the risk of thermal stress concentration in the battery monomer assembly, and facilitating the battery monomers in the battery monomer assembly to work within an appropriate temperature range, thereby improving the reliability of the battery device.

[0011] In one or more embodiments of the first aspect, the heat management component has a first surface facing the battery monomer assembly, the first surface being provided with a groove, and at least part of the first thermal insulation pad being located in the groove.

[0012] In the above scheme, by locating at least part of the first thermal insulation pad in the groove, the size of the battery monomer assembly in the second direction can be substantially uniform. This reduces the risk of a decrease in the structural stability of the battery monomer assembly due to misalignment of the first and second battery monomers. Furthermore, during use of the battery device, the risk of damage to internal components or poor electrical connection of the battery device due to insufficient structural stability of the battery monomer assembly, shaking, and the like can be reduced, thereby improving the reliability of the battery device. In addition, the first thermal insulation pad shares space with the heat management component, which is conducive to improving the energy density of the battery device.

[0013] In one or more embodiments of the first aspect, the first thermal insulation pad has a second surface facing the first battery monomer, and the second surface is flush with the first surface.

[0014] In the above scheme, when the second surface and the first surface are in the same plane, the risk of excessive dimensional deviation in the second direction of different regions of the battery monomer assembly due to the presence of the first thermal insulation pad after assembly of the battery monomer assembly can be further reduced. This is conducive to further improving the structural stability of the battery monomer assembly.

[0015] In one or more embodiments of the first aspect, the battery device further comprises a first adhesive layer, the first adhesive layer comprising a first region and a second region, the first region being arranged between the first thermal insulation pad and the first battery monomer, and the second region being arranged between the second battery monomer and the first surface.

[0016] In the above scheme, the presence of the first adhesive layer can improve the connection stability of the first and second battery monomers and the heat management component.

[0017] Meanwhile, since at least part of the first thermal insulation pad is arranged in the groove, in the second direction, the height of the first region protruding from the first surface is substantially consistent with the height of the second region protruding from the first surface. In this way, the risk of excessive size deviation of different regions of the battery monomer assembly in the second direction can be reduced. In turn, the structural stability of the battery monomer assembly can be further improved. In addition, it is also beneficial to form a relatively uniform first adhesive layer, so that the size of each region of the battery monomer assembly in the second direction approaches the design value, the risk of stress concentration area in the battery device is lower, and the battery device has higher structural stability after assembly. The configuration of the first adhesive layer has relatively small influence on the deviation between the thermal management performance of the battery device and the theoretical design, which is beneficial to make the battery device have higher reliability.

[0018] In one or more embodiments of the first aspect, the first thermal insulation pad is in contact with the groove side wall.

[0019] In the above scheme, since the first thermal insulation pad is in contact with the groove side wall, the risk of the thickness of the first adhesive layer deviating greatly from the design value due to the gap between the first thermal insulation pad and the groove side wall is low, and the thickness uniformity of the first adhesive layer can be further improved.

[0020] In one or more embodiments of the first aspect, the thickness of the first region and the thickness of the second region are the same.

[0021] In the above scheme, since the thickness of the first region and the thickness of the second region are the same, in the second direction, the configuration of the first adhesive layer has relatively small influence on the size deviation of each region of the battery monomer assembly, which is beneficial to make the battery monomer assembly have higher structural stability.

[0022] In one or more embodiments of the first aspect, the thickness of the first adhesive layer is H1, which satisfies: 0.8mm≤H1≤1.5mm.

[0023] In the above scheme, when H1≥0.8mm, the first adhesive layer has a larger thickness, the battery monomer and the thermal management component have higher connection stability, and the battery device has higher reliability; when H1≤1.5mm, the battery device has higher energy density; therefore, when 0.8mm≤H1≤1.5mm, the battery device can balance higher reliability and energy density.

[0024] In one or more embodiments of the first aspect, the first thermal insulation pad is connected to the groove bottom wall through a second adhesive layer.

[0025] In the above scheme, the arrangement of the second adhesive layer can improve the connection stability between the first thermal insulation pad and the thermal management component, and reduce the risk that the mispositioning of the first thermal insulation pad causes the thermal insulation effect of the first battery monomer to fail.

[0026] 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 positive projection of the battery cell assembly on the thermal management component is a first projection, the medium inlet and the medium outlet are located on the same side of the first projection in the first direction. The first battery cell is closer to the medium inlet and the medium outlet than the second battery cell.

[0027] 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 first battery cell is closer to the medium inlet and the medium outlet than the second battery cell, and the first thermal insulation pad is arranged between the first battery cell and the thermal management component. During the operation of the battery device, the temperature difference between the first battery cell and the second battery cell is small, the risk of thermal stress concentration in the battery device is low, and the reliability of the battery device is high.

[0028] In one or more embodiments of the first aspect, the battery device further comprises a first limiting piece and a second limiting piece, the first limiting piece and the second limiting piece are arranged in a spaced manner along the first direction, and the plurality of battery cells are arranged between the first limiting piece and the second limiting piece. The medium inlet and the medium outlet are located on the side of the first limiting piece away from the second limiting piece in the first direction.

[0029] In the above scheme, the arrangement of the first limiting piece and the second limiting piece can reduce the risk of battery cell shaking. In addition, since the medium inlet and the medium outlet are located on the side of the first limiting piece away from the second limiting piece in the first direction, during the assembly of the battery device, the assembly of the medium inlet and the medium outlet has a low risk of interference with the battery cells.

[0030] In one or more embodiments of the first aspect, the first limiting piece and the second limiting piece are both connected to the thermal management component.

[0031] In the above scheme, the connection of the first limiting piece and the second limiting piece to the thermal management component is conducive to saving the internal space of the battery device and improving the energy density of the battery device.

[0032] In one or more embodiments of the first aspect, the battery device further comprises a pressing strip, the pressing strip extends along the first direction, both ends of the pressing strip are connected to the first limiting piece and the second limiting piece respectively, and the pressing strip is pressed to the side of the battery cell away from the thermal management component.

[0033] In the above scheme, by arranging at least part of the first thermal insulation pad in the groove, the size of the battery cell assembly in the second direction can be substantially uniform, thereby reducing the risk of stress concentration between the battery cell assembly and the pressing strip due to excessive deviation of different areas of the battery cell assembly in the second direction, and the battery device has high reliability.

[0034] In one or more embodiments of the first aspect, the first thermal insulation pad has a thickness H2, 0.5mm≤H2≤1.2mm.

[0035] In the above solution, when H2≥0.5mm, the first thermal insulation pad has a larger thickness, and the first thermal insulation pad has a larger strength. During use of the battery device, the first thermal insulation pad can continuously have good thermal insulation performance, thereby improving the reliability of the battery device. When H2≤1.2mm, the manufacturing cost of the first thermal insulation pad is lower. Therefore, when 0.5mm≤H2≤1.2mm, the battery device has higher reliability, and the manufacturing cost of the battery device can be reduced. In addition, when the first thermal insulation pad is completely located in the groove, the thickness of the first thermal insulation pad is set in a reasonable range, which is beneficial to control the groove depth of the groove in a reasonable range, so that the thermal management component has a higher strength, and the structural stability of the battery device is improved.

[0036] In one or more embodiments of the first aspect, the material of the first thermal insulation pad includes aerogel or foam.

[0037] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the second direction, the first thermal insulation pad has an overlapping area with the first battery monomer in the orthogonal projection, the area of the overlapping area is S1, and the area of the orthogonal projection of the first battery monomer is S2, 50%≤S1 / S2≤80%.

[0038] In the above solution, when S1 / S2≥50%, the heat exchange efficiency of the first battery monomer is lower, and the risk of the first battery monomer and the second battery monomer having a too large temperature difference due to the excessive heat exchange efficiency of the first battery monomer is lower, and the reliability of the battery device is higher. When S1 / S2≤80%, the first battery monomer can have a higher heat exchange efficiency. Therefore, when 50%≤S1 / S2≤80%, the first battery monomer has a higher heat exchange efficiency, and the reliability of the battery device can be improved.

[0039] In one or more embodiments of the first aspect, the thermal management component carries the battery monomer assembly.

[0040] In the above solution, the thermal management component can not only be used to adjust the temperature of the battery monomer, but also be used to carry the battery monomer assembly, so that the structure of the battery device is more compact, and the battery device has a higher energy density.

[0041] 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. A positive 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 a first direction. Among the plurality of battery cells, two battery cells located at the two ends are 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.

[0042] 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 located at the end of the battery cell assembly in at least one of the two ends along the first direction is set to be less than the heat exchange efficiency of any battery cell located between the two ends along 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. In addition, 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, when the overlapping area of the first end battery cell and the flow channel is less than the overlapping area of the remaining battery cells except the second end battery cell and the flow channel, the heat exchange efficiency of the two end battery cells can be set to be relatively low, and the heat exchange efficiency of the remaining battery cells can be set to be relatively high. The temperature difference between all battery cells in the battery cell assembly during heat exchange can be small, so that the temperature distribution of the entire battery cell assembly is relatively uniform.

[0043] 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 is in communication 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 is in communication with the third flow channel.

[0044] In the above scheme, the flow channel is further subdivided into flow channels and branch flow channels, which can further improve the uniformity of heat exchange of the heat exchange medium.

[0045] In one or more embodiments of the first aspect, the heat 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 fifth partition.

[0056] In the above scheme, since the fifth partition closer to the third communication port has a greater distance between the third end and the fifth partition, the heat exchange medium can flow faster through the third communication port and toward the medium outlet, thereby improving the heat exchange efficiency.

[0057] 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.

[0058] 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.

[0059] In one or more embodiments of the first aspect, the thermal 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.

[0060] In the above scheme, since the fifth cavity and the sixth cavity are not in communication with the flow channel, the thermal 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.

[0061] In one or more embodiments of the first aspect, the thermal 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.

[0062] In the above scheme, the thermal 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 thermal management component has low deformation and high precision during processing.

[0063] 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.

[0064] 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 of each battery cell in the battery cell assembly is relatively small.

[0065] In one or more embodiments of the first aspect, among the plurality of battery cells, two battery cells located at both ends are respectively the first end battery cell and the second end battery cell. The battery device further comprises a first limiting piece, a second limiting piece, a second thermal insulation pad and a third thermal insulation pad, the first limiting piece and the second limiting piece are arranged at intervals along the first direction, and the plurality of battery cells are arranged between the first limiting piece and the second limiting piece, the first end battery cell is located at one end of the battery cell assembly close to the first limiting piece, and the second end battery cell is located at one end of the battery cell assembly close to the second limiting piece. The third thermal insulation pad is arranged between the first limiting piece and the first end battery cell; and / or, the fourth thermal insulation pad is arranged between the second limiting piece and the second end battery cell.

[0066] In the above scheme, the limiting piece increases the heat exchange path of the battery monomer at the end and the heat management component, and the heat exchange efficiency of the heat management component and the battery monomer at the end of at least one end of the two ends along the first direction of the battery monomer assembly is set to be less than the heat exchange efficiency of any battery monomer between the two ends along the first direction. The risk of thermal stress concentration of the battery monomer assembly can be significantly reduced. By arranging the heat insulation pad between the limiting piece and the battery monomer at the end, the risk that the actual heat exchange efficiency of the battery monomer assembly deviates from the design due to the heat exchange between the battery monomer at the end and the limiting piece can be reduced. It is beneficial to control the temperature difference between each battery monomer in the battery monomer assembly within a reasonable range and reduce the risk of thermal stress concentration of the battery monomer assembly.

[0067] In one or more embodiments of the first aspect, the first limiting piece is made of metal, and / or the second limiting piece is made of metal.

[0068] In the above scheme, since the limiting piece made of metal has relatively high thermal conductivity, by arranging the second heat insulation pad and / or the third heat insulation pad, the heat exchange efficiency of the heat management component and the battery monomer at the end of at least one end of the two ends along the first direction of the battery monomer assembly is set to be less than the heat exchange efficiency of any battery monomer between the two ends along the first direction. The risk of thermal stress concentration of the battery monomer assembly can be significantly reduced.

[0069] In a second aspect, the application provides a power consumption device comprising the battery device in one or more embodiments described above, which is used to provide electric energy.

[0070] In the above scheme, since the battery device in one or more embodiments described above has high reliability, the power consumption device comprising the battery device in one or more embodiments described above also has high reliability.

[0071] The above description is only a summary of the technical scheme of the application. In order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0072] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered limiting the application. Moreover, the same reference numbers are used to represent the same components throughout the drawings. In the drawings:

[0073] Figure 1 Structure schematic view of vehicle for some embodiments of the application;

[0074] Figure 2 Exploded view of a battery device for some embodiments of the present application;

[0075] Figure 3 Exploded view of a battery cell for some embodiments of the present application;

[0076] Figure 4 Axonometric view of a partial structure of a battery device for some embodiments of the present application;

[0077] Figure 5 For some embodiments of the present application; Figure 4 Close-up view at A;

[0078] Figure 6 Sectional view of a partial structure of a battery device for some embodiments of the present application;

[0079] Figure 7 For some embodiments of the present application; Figure 6 Close-up view at B;

[0080] Figure 8 Structure schematic of a partial structure of a battery device for some embodiments of the present application;

[0081] Figure 9 Structure schematic of a partial structure of a battery device for some embodiments of the present application;

[0082] Figure 10 Structure schematic of a thermal management component for some embodiments of the present application;

[0083] Figure 11 Sectional view of a thermal management component for some embodiments of the present application;

[0084] Figure 12 For some embodiments of the present application; Figure 11 Close-up view at C;

[0085] Figure 13 For some embodiments of the present application; Figure 11 Close-up view at D.

[0086] Reference numerals in the detailed description of the embodiments are as follows:

[0087] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - case; 111 - first case; 112 - second case; 12 - battery cell; 120 - first projection; 121 - housing; 1211 - end cap; 1212 - shell; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter; 1201 - first battery cell; 1202 - second battery cell; 1203 - first end battery cell; 1204 - second end battery cell; 13 - thermal management component; 131 - first surface; 132 - groove; 133 - flow channel; 134 - medium inlet; 135 - medium outlet; 136 - first manifold; 137 - second manifold; 138 - third manifold; 139 - first branch channel; 1310 - second branch channel; 1311 - first cavity; 1312 - second cavity; 1313 - third cavity; 1314 - fourth cavity; 1315 - first partition; 13151 - first communication port; 1316 - second partition; 13161 - second communication port; 1317 - third partition; 13171 - third communication port; 1318 - fourth partition; 1319 - fifth partition; 1320 - first inner wall; 1321 - second inner wall; 1322 - fifth cavity; 1323 - sixth cavity; 1324 - first profile; 1325 - second profile; 1326 - third profile; 1327 - fourth profile; 1328 - fifth profile; 1329 - sixth profile; 14 - first thermal insulation pad; 141 - second surface; 15 - first limiting member; 16 - second limiting member; 17 - first adhesive layer; 171 - first region; 172 - second region; 18 - pressing strip; 19 - second adhesive layer; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0088] The embodiments of the technical solution 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 solution of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0089] 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 the present application; the terms "comprising" and "having", and any variations thereof, as used in the specification and claims and the aforementioned description of the drawings, are intended to cover not exclusively including.

[0090] 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 and specifically limited.

[0091] 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 occurrence of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a separate or alternative embodiment to the other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0092] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0093] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0094] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0095] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0096] In some embodiments, the separator is a separator film. The separator film can be selected from any known porous structure separator film with good chemical stability and mechanical stability.

[0097] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is arranged between the positive electrode and the negative electrode, and at the same time plays the role of transmitting ions and isolating the positive and negative electrodes.

[0098] In some embodiments, the battery cell further includes an electrolyte, which plays the role of conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0099] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode tab and the negative electrode tab are wound into the jelly-roll structure.

[0100] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode tab and the negative electrode tab are wound into the jelly-roll structure.

[0101] In some embodiments, the electrode assembly can be in a cylindrical shape, a flat shape, or a polygonal shape, etc.

[0102] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0103] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square battery cell, a blade battery cell, a polygonal battery cell, such as a hexagonal battery cell, etc.

[0104] The battery apparatus mentioned in the embodiments of the present 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, in parallel, or in a mixed connection through a busbar component.

[0105] 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.

[0106] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0107] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0108] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0109] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0110] 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 a cylindrical battery cell or a pouch battery cell or a blade battery cell in some aspects.

[0111] 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 to the reliability of the battery device.

[0112] 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 battery cell assembly and the remaining battery cells in a conventional battery cell assembly, because the battery cell at the end is only adjacent to the adjacent battery cell on one side, and the remaining battery cells have battery cells on both sides. This will cause a large temperature difference between each battery cell in the battery cell assembly, and heat stress concentration is likely to occur. Once the above phenomenon occurs, the performance of the shell or other components of the battery cell will decrease, and even the material will be damaged, such as connection failure, shell rupture, and other undesirable phenomena. The reliability of the battery device is poor.

[0113] In view of this, the present application provides a battery device, which comprises a battery cell assembly and a heat management component. 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, 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. Because 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 heat stress concentration is lower, and the reliability of the battery device is higher.

[0114] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electric devices using battery devices.

[0115] The electric device includes but is not limited to a battery car, an electric vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0116] The following embodiments are described below for the convenience of explanation, taking a vehicle as an example of an electric device of an embodiment of the present application.

[0117] For example, Figure 1As a structural schematic diagram of the vehicle 1000 of some embodiments of the present application, the vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 can be internally provided with a motor 300, a controller 200, and a battery device 100, the controller 200 being configured 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 configured to supply power to the vehicle 1000, for example, the battery device 100 can be configured as an operating power source of the vehicle 1000, and can be configured to supply power to the circuit system of the vehicle 1000, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery device 100 can not only be configured as an operating power source of the vehicle 1000, but also can be configured 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.

[0118] In order to meet different power demands, the battery device 100 can include a plurality of battery cells 12, which can be connected in series, in parallel, or in a hybrid manner. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to form a battery cell assembly, and the plurality of battery cell assemblies can be connected in series, in parallel, or in a hybrid manner to form the battery device 100. That is, the plurality of battery cells 12 can be directly connected to form the battery device 100, or can be connected to form a battery cell assembly, and the battery cell assembly can be connected to form the battery device 100.

[0119] For example, referring to Figure 2 , Figure 2 As an exploded view of the battery device 100 of 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 has a hollow structure, and the plurality of battery cells 12 can be accommodated in the box 11. As shown, the first box 111 and the second box 112 are coupled 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, and the first box 111 and the second box 112 can each have an open face. For example, the first box 111 and the second box 112 can each be a hollow cuboid and 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 coupled to each other to form the box 11 having a closed cavity. The plurality of battery cells 12 connected in parallel, in series, or in a hybrid manner are placed in the box 11 formed by the coupling of the first box 111 and the second box 112.

[0120] 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 for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0121] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery cell assembly. The number of battery cells 12 included in a battery cell assembly is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies, which can be connected in series, parallel, or mixed connection.

[0122] Please refer to Figure 3 As shown, Figure 3 The image shows an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity for accommodating the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 may have an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0123] The battery cell 12 may also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is provided with a corresponding adapter 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be configured as a single unit or multiple units, and multiple independent electrode assemblies 122 are disposed within the battery cell 12.

[0124] According to some embodiments of the present application, please refer to Figures 4-13 The battery device 100 comprises a battery cell assembly comprising a plurality of battery cells 12 arranged along a first direction X, and a thermal management component 13 arranged on one side of the battery cell assembly along a second direction Y intersecting 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 the first direction X at least one of the two ends is less than the heat exchange efficiency of any battery cell 12 between the two ends along the first direction X.

[0125] There are various ways to set the heat exchange efficiency of the battery cells 12 at the ends to be less than that of the remaining battery cells 12, including but not limited to: in the embodiment where the thermal management component 13 has flow channels 133, the end battery cells 12 can be made not to overlap the flow channels 133. The area of the end battery cells 12 overlapping the flow channels 133 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 133 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 part of the end battery cells 12 in contact with the thermal management component 13 can be set to be 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.

[0126] The heat exchange medium can be a gas, a liquid, or a gas-liquid mixture, etc.

[0127] In some embodiments, the thermal management component 13 carries the battery cell assembly.

[0128] In some embodiments, the plurality of battery cells 12 can be fixed by a binding strap.

[0129] The thermal management component 13 can be used to heat or cool the battery cells 12, i.e. can be used to warm up the battery cells 12, or can be used to cool down the battery cells 12.

[0130] In some embodiments, the battery cells 12 are square battery cells 12, and the surface of the battery cells 12 along the first direction X is the largest surface of the battery cells 12.

[0131] In some embodiments, the battery cell 12 includes a housing 121, electrode terminals 123, a pressure relief mechanism, and an electrode assembly 122 disposed within the housing 121, the housing 121 including a first wall on a side of the electrode assembly 122 facing away from the thermal management component 13 along a second direction Y. The electrode terminals 123 are disposed on the first wall. In other embodiments, the housing 121 includes a shell 1212 having an opening and an end cap 1211 closing the opening.

[0132] In some embodiments, the battery device 100 is applied to a vehicle 1000, the first direction X is a front-rear direction of the vehicle 1000, and the second direction Y is a left-right direction of the vehicle 1000.

[0133] In some embodiments, the battery device 100 is applied to a vehicle 1000, the first direction X is a front-rear direction of the vehicle 1000, and the second direction Y is an up-down direction of the vehicle 1000.

[0134] In some embodiments, two battery cell assemblies are provided, and the two battery cell assemblies are arranged along a third direction Z, the third direction Z, the second direction Y, and the first direction X being perpendicular to each other.

[0135] In some embodiments, the thermal management component 13 can include a first plate body and a second plate body stacked along the second direction Y, and a flow channel 133 for accommodating a heat exchange medium is formed between the first plate body and the second plate body.

[0136] In some embodiments, the thermal management component 13 can be formed by welding a plurality of profiles and a plurality of partitions, and a cavity of the profile forms the flow channel 133. Of course, the thermal management component 13 can also include only one profile, and a cavity of the profile forms the flow channel 133.

[0137] In some embodiments, the material of the thermal management component 13 can include but is not limited to metal, such as aluminum, steel, aluminum alloy, etc.

[0138] In some embodiments, the second direction Y is parallel to the direction of gravity, and the battery cell assembly can be located above the thermal management component 13 along the direction of gravity or below the thermal management component 13 along the direction of gravity.

[0139] 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 of the medium and the heat exchange area, 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.

[0140] In the above scheme, since the heat exchange efficiency between the thermal management component 13 and the battery cell 12 at the end of the battery cell assembly located at at least one of the two ends along the first direction X is less 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 relatively uniform, the risk of thermal stress concentration is low, and the reliability of the battery device 100 is high.

[0141] According to some embodiments of the present application, please refer to Figures 4-7 The plurality of battery cells 12 includes at least one first battery cell 1201 and at least one second battery cell 1202. The first battery cell 1201 and the thermal management component 13 are provided with the first thermal insulation pad 14, and the second battery cell 1202 and the thermal management component 13 are not provided with the first thermal insulation pad 14. The at least one first battery cell 1201 is the battery cell 12 at the end of the battery cell assembly, and the at least one second battery cell 1202 is the battery cell 12 of the battery cell assembly located between the two ends along the first direction X.

[0142] The first battery cell 1201 and the thermal management component 13 are provided with the first thermal insulation pad 14, and the second battery cell 1202 and the thermal management component 13 are not provided with the first thermal insulation pad 14, which means that the heat exchange efficiency between the first battery cell 1201 and the thermal management component 13 is lower than the heat exchange efficiency between the second battery cell 1202 and the thermal management component 13. Such arrangement can select the arrangement position of the first battery cell 1201 and the second battery cell 1202 according to the system temperature distribution of the battery device 100, so that the overall temperature distribution of the battery device 100 is relatively uniform.

[0143] In some embodiments, the first thermal insulation pad 14 can be directly arranged on the surface of the thermal management component 13 facing the first battery cell 1201.

[0144] In some embodiments, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the first battery cell 1201 can be located within the orthographic projection of the first thermal insulation pad 14. The orthographic projection of the first thermal insulation pad 14 can be located within the first battery cell 1201. The orthographic projection of the first thermal insulation pad 14 can be partially located within the orthographic projection of the first battery cell 1201 and partially located outside the orthographic projection of the first battery cell 1201.

[0145] In the above scheme, by adjusting the heat exchange efficiency between the first battery cell 1201 and the second battery cell 1202 and the thermal management component 13 in the battery cell assembly through the arrangement of the first thermal insulation pad 14, the overall temperature distribution of the battery cell assembly is relatively uniform, the risk of thermal stress concentration in the battery cell assembly is reduced, and the battery cell 12 in the battery cell assembly is beneficial to work in the appropriate temperature range, thereby improving the reliability of the battery device 100.

[0146] According to some embodiments of the present application, please refer to Figures 4-7 The heat management component 13 has a first surface 131 facing the battery cell assembly, and the first surface 131 is provided with a groove 132, and at least part of the first thermal insulation pad 14 is located in the groove 132.

[0147] The heat management component 13 has a first surface 131 facing the battery cell assembly, and the first surface 131 is provided with a groove 132, and at least part of the first thermal insulation pad 14 is located in the groove 132. This means that, compared with the first thermal insulation pad 14 being directly arranged on the first surface 131, the difference between the height of the first battery cell 1201 beyond the heat management component 13 and the height of the second battery cell 1202 beyond the heat management component 13 is smaller in the second direction Y, that is, the size of the battery cell assembly in the second direction Y is basically consistent. When the battery cell assembly is subjected to external force, or when the battery device 100 is shaken, or when there is internal force in the battery cell assembly (for example, when the battery cell 12 expands), the risk of damage to the battery cell 12 in the battery cell assembly is lower, and the risk of electrical connection failure of the battery cell 12 is lower (in some embodiments, the battery device 100 also includes a busbar component for electrically connecting two adjacent battery cells 12, and the electrical connection failure of the battery cell 12 can refer to the electrical connection failure between the busbar component and the battery cell 12).

[0148] In some embodiments, the groove side wall of the groove 132 surrounds the first thermal insulation pad 14, and there can be a gap between the groove side wall of the groove 132 and the first thermal insulation pad 14. In this embodiment, the gap can be filled with a glue to connect the first thermal insulation pad 14 and the groove side wall of the groove 132.

[0149] In the technical solution of the embodiments of the present application, by arranging at least part of the first thermal insulation pad 14 in the groove 132, the size of the battery cell assembly in the second direction Y can be basically consistent. Such an arrangement can reduce the risk of a decrease in the structural stability of the battery cell assembly caused by mispositioning of the first battery cell 1201 and the second battery cell 1202. Furthermore, during use of the battery device 100, the risk of damage to internal elements or electrical connection failure of the battery device 100 caused by insufficient structural stability of the battery cell assembly, shaking, and the like can be reduced, thereby making the battery device 100 have higher reliability. In addition, the first thermal insulation pad 14 and the heat management component 13 share part of the space, which is conducive to improving the energy density of the battery device 100.

[0150] According to some embodiments of the present application, please refer to Figures 4-7 The present application provides a battery device 100, and the first thermal insulation pad 14 has a second surface 141 facing the first battery cell 1201, and the second surface 141 is flush with the first surface 131.

[0151] The second surface 141 being flush with the first surface 131 means that the second surface 141 is in the same plane as the first surface 131. The configuration of the first thermal insulation pad 14 has a relatively small impact on the dimensional deviation of different regions of the battery cell assembly.

[0152] In the embodiment in which there is a gap between the groove sidewall of the groove 132 and the first thermal insulation pad 14 and the gap is filled with the gel, the surface of the gel facing the first battery cell 1201 in the second direction Y can also be flush with the first surface 131.

[0153] When the distance between the second surface 141 and the first surface 131 is in the range of -0.7mm to 1.5mm, the second surface 141 can be considered to be flush with the first surface 131.

[0154] In the above scheme, when the second surface 141 and the first surface 131 are in the same plane, the risk of excessive dimensional deviation of different regions of the battery cell assembly in the second direction Y due to the arrangement of the first thermal insulation pad 14 after the assembly of the battery cell assembly can be further reduced. Thus, it is beneficial to further improve the structural stability of the battery cell assembly.

[0155] According to some embodiments of the present application, please refer to Figures 4-7 The battery device 100 further comprises a first adhesive layer 17, the first adhesive layer 17 comprising a first region 171 and a second region 172, the first region 171 being arranged between the first thermal insulation pad 14 and the first battery cell 1201, and the second region 172 being arranged between the second battery cell 1202 and the first surface 131.

[0156] In some embodiments, the first adhesive layer further comprises a third region, the third region being arranged between the first battery cell 1201 and the first surface 131. In other embodiments, the thickness of the third region, the second region 172 and the first region 171 are the same.

[0157] In some embodiments, the first adhesive layer is a thermally conductive adhesive.

[0158] In some embodiments, the first adhesive layer comprises a base material and an adhesive in a double-sided adhesive tape.

[0159] In some embodiments, the first adhesive layer can be a solidified liquid glue. Generally, the spraying amount of the glue per unit area of the glue application device is substantially uniform. During the process of laying the first adhesive layer along the first direction X on the first surface 131, since at least part of the first thermal insulation pad 14 is arranged in the groove 132, the distance between the first thermal insulation pad 14 along the second direction Y and the first surface 131 is small, the risk of uneven thickness caused by the flow of the glue is low, and the thickness of the solidified first adhesive layer is relatively uniform. Further, the risk of the different regions of the battery monomer assembly deviating more in the second direction Y due to the uneven thickness of the first adhesive layer 17 can be reduced.

[0160] In the above scheme, the arrangement of the first adhesive layer 17 can improve the connection stability of the first battery monomer 1201 and the second battery monomer 1202 with the thermal management component 13.

[0161] At the same time, since at least part of the first thermal insulation pad 14 is arranged in the groove 132, in the second direction Y, the height of the first region 171 protruding from the first surface 131 is substantially consistent with the height of the second region 172 protruding from the first surface 131. In this way, the risk of excessive dimensional deviation of different regions of the battery monomer assembly in the second direction Y can be reduced. Further, the structural stability of the battery monomer assembly can be further improved. In addition, it is also beneficial to form a first adhesive layer 17 with a relatively uniform thickness, so that the dimensions of each region of the battery monomer assembly in the second direction Y can approach the design value, the risk of stress concentration area in the battery device 100 is low, and the battery device 100 can have high structural stability after assembly. The configuration of the first adhesive layer 17 has relatively small influence on the deviation between the thermal management performance of the battery device 100 and the theoretical design, which is beneficial to make the battery device 100 have high reliability.

[0162] According to some embodiments of the present application, please refer to Figures 4-7 The first thermal insulation pad 14 is in contact with the groove side wall of the groove 132.

[0163] The first thermal insulation pad 14 is in contact with the groove side wall of the groove 132, which means that there is no gap between the first thermal insulation pad 14 and the groove side wall of the groove 132, in other words, the risk of uneven thickness of the first adhesive layer 17 caused by the first adhesive layer 17 entering the gap is low.

[0164] In the above scheme, since the first thermal insulation pad 14 is in contact with the groove side wall of the groove 132, the risk of the thickness of the first adhesive layer 17 deviating greatly from the design value caused by the gap between the first thermal insulation pad 14 and the groove side wall of the groove 132 is low, and the thickness uniformity of the first adhesive layer 17 can be further improved.

[0165] According to some embodiments of the present application, please refer to Figures 4-7 The thickness of the first region 171 and the thickness of the second region 172 are the same.

[0166] When the difference between the thickness of the first region 171 and the thickness of the second region 172 is greater than or equal to 0 mm and less than or equal to 2 mm, it can be considered that the thickness of the first region 171 is the same as the thickness of the second region 172.

[0167] In the above scheme, since the thickness of the first region 171 and the thickness of the second region 172 are the same, in the second direction Y, the arrangement of the first adhesive layer 17 has relatively small influence on the size deviation of each region of the battery monomer assembly, which is conducive to making the battery monomer assembly have higher structural stability.

[0168] According to some embodiments of the present application, please refer to Figures 4-7 , the thickness of the first adhesive layer 17 is H1, which satisfies: 0.8 mm≤H1≤1.5 mm.

[0169] The thickness of the first adhesive layer 17 can be any value between greater than or equal to 0.8 mm and less than or equal to 1.5 mm, for example, any one of 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or a range value between any two of them.

[0170] In the above scheme, when H1≥0.8 mm, the first adhesive layer 17 has a larger thickness, the battery monomer 12 and the thermal management component 13 have higher connection stability, and the battery device 100 has higher reliability; when H1≤1.5 mm, the battery device 100 has higher energy density; therefore, when 0.8 mm≤H1≤1.5 mm, the battery device 100 can have both higher reliability and energy density.

[0171] According to some embodiments of the present application, please refer to Figures 7-9 , the first thermal insulation pad 14 is connected to the groove bottom wall of the groove 132 through the second adhesive layer 19.

[0172] In some embodiments, the second adhesive layer is a thermal conductive glue.

[0173] In some embodiments, the second adhesive layer includes a substrate and an adhesive in the double-sided adhesive tape.

[0174] In the above scheme, the arrangement of the second adhesive layer 19 can improve the connection stability between the first thermal insulation pad 14 and the thermal management component 13, and reduce the risk that the misalignment of the first thermal insulation pad 14 causes the thermal insulation effect of the first battery monomer 1201 to fail.

[0175] According to some embodiments of the present application, please refer to Figure 7 and Figure 8The heat management component 13 has a flow channel 133 containing a heat exchange medium, and the heat management component 13 further includes a medium inlet 134 and a medium outlet 135, both of which are in communication with the flow channel 133. The positive projection of the battery cell assembly on the heat management component 13 is a first projection 120, and the medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 in the first direction X. The first battery cell 1201 is closer to the medium inlet 134 and the medium outlet 135 than the second battery cell 1202.

[0176] The medium inlet 134 and the medium outlet 135 can be holes in communication with the flow channel 133 of the heat management component 13, or water nozzles or the like connected to the flow channel 133.

[0177] The flow channel 133 can be formed by machining, injection molding, casting, 3D printing, or welding.

[0178] Since the heat exchange medium in the area near the medium inlet 134 has not been heat exchanged, and the heat exchange medium in the area far from the medium inlet 134 has been heat exchanged, and the medium outlet 135 and the medium inlet 134 are located on the same side of the first projection 120 in the first direction X, the heat exchange medium in the area near the medium outlet 135 is closer to the heat exchange medium that has not been heat exchanged. Therefore, the temperature difference between the area near the medium inlet 134 and the medium outlet 135 and the remaining area is larger. By setting the position of the first battery cell 1201 to be closer to the medium inlet 134 and the medium outlet 135 than the second battery cell 1202, and setting the first thermal insulation pad 14 between the first battery cell 1201 and the heat management component 13, the temperature difference between the first battery cell 1201 and the second battery cell 1202 during the heat exchange process of the battery device 100 is relatively small.

[0179] In the above scheme, since the medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 in the first direction X, the first battery cell 1201 is closer to the medium inlet 134 and the medium outlet 135 than the second battery cell 1202, and the first thermal insulation pad 14 is provided between the first battery cell 1201 and the heat management component 13. During the operation of the battery device 100, the temperature difference between the first battery cell 1201 and the second battery cell 1202 is small, the risk of thermal stress concentration in the battery device 100 is low, and the reliability of the battery device 100 is high.

[0180] According to some embodiments of the present application, please refer to Figures 7-9The battery device 100 further comprises a first limiting member 15 and a second limiting member 16, the first limiting member 15 and the second limiting member 16 are arranged at intervals along the first direction X, and the plurality of battery cells 12 are arranged between the first limiting member 15 and the second limiting member 16. The medium inlet 134 and the medium outlet 135 are located on the side of the first limiting member 15 away from the second limiting member 16 along the first direction X.

[0181] The first limiting member 15 and the second limiting member 16 can be end plates, or can be expansion beams for resisting deformation of the battery cells 12.

[0182] In some embodiments, the first limiting member 15 and the second limiting member 16 are made of a fiber-reinforced material.

[0183] In some embodiments, the first limiting member 15 and the second limiting member 16 are made of a metal, such as aluminum, steel, etc.

[0184] In the above scheme, the arrangement of the first limiting member 15 and the second limiting member 16 can reduce the risk of the battery cells 12 shaking. In addition, since the medium inlet 134 and the medium outlet 135 are located on the side of the first limiting member 15 away from the second limiting member 16 along the first direction X, the risk of interference between the assembly of the medium inlet 134 and the medium outlet 135 and the battery cells 12 during assembly of the battery device 100 is low.

[0185] According to some embodiments of the present application, please refer to Figures 7-9 The first limiting member 15 and the second limiting member 16 are both connected to the thermal management component 13.

[0186] The first limiting member 15 and the second limiting member 16 can be connected to the thermal management component 13 by fasteners or welding, etc.

[0187] The thermal management component 13 combines the functions of adjusting the temperature of the battery cells 12 and the mounting base of the limiting member, which can save the space occupied by arranging an additional connecting base, and is beneficial to improve the energy density of the battery device 100.

[0188] In the above scheme, the first limiting member 15 and the second limiting member 16 are both connected to the thermal management component 13, which is beneficial to save the internal space of the battery device 100 and improve the energy density of the battery device 100.

[0189] According to some embodiments of the present application, please refer to Figures 7-9 The battery device 100 further comprises a pressing strip 18, the pressing strip 18 extends along the first direction X, both ends of the pressing strip 18 are connected to the first limiting member 15 and the second limiting member 16 respectively, and the pressing strip 18 is pressed to the side of the battery cell 12 away from the thermal management component 13.

[0190] The material of the pressing strip 18 can include, but is not limited to, metal, plastic, etc. In the embodiment where the material of the pressing strip 18 is metal, the material of the pressing strip 18 can include, but is not limited to, copper, iron, aluminum, steel, aluminum alloy, etc.

[0191] In some embodiments, the pressing strip 18 can be connected with the first limiting member 15 and the second limiting member 16 through glue.

[0192] In some other embodiments, the pressing strip 18 can be connected with the first limiting member 15 and the second limiting member 16 through fasteners.

[0193] In the above scheme, by arranging at least part of the first thermal insulation pad 14 in the groove 132, the size of the battery monomer assembly in the second direction Y can be substantially uniform, thereby reducing the risk of stress concentration area between the battery monomer assembly and the pressing strip 18 due to excessive deviation of different areas of the battery monomer assembly in the second direction Y, and improving the reliability of the battery device 100.

[0194] According to some embodiments of the present application, please refer to Figures 7-9 The thickness of the first thermal insulation pad 14 is H2, and 0.5mm≤H2≤1.2mm.

[0195] The thickness of the first thermal insulation pad 14 can be any value between greater than or equal to 0.5mm or less than or equal to 1.2mm, for example, any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc. or a range value between any two of them.

[0196] In the above scheme, when H2≥0.5mm, the first thermal insulation pad 14 has a larger thickness, and the first thermal insulation pad 14 has a larger strength. During the use of the battery device 100, the first thermal insulation pad 14 can continuously have good thermal insulation performance, thereby improving the reliability of the battery device 100. When H2≤1.2mm, the manufacturing cost of the first thermal insulation pad 14 is lower. Therefore, when 0.5mm≤H2≤1.2mm, the battery device 100 has higher reliability, and the manufacturing cost of the battery device 100 can be reduced. In addition, when the first thermal insulation pad 14 is completely located in the groove 132, setting the thickness of the first thermal insulation pad 14 within a reasonable range is conducive to controlling the groove depth of the groove 132 within a reasonable range, thereby making the heat management component 13 have higher strength and improving the structural stability of the battery device 100.

[0197] According to some embodiments of the present application, the material of the first thermal insulation pad 14 includes aerogel or foam.

[0198] According to some embodiments of the present application, please refer to Figures 4-7In the same projection plane perpendicular to the second direction Y, the first heat insulation pad 14 has an overlapping area with the front projection of the first battery monomer 1201, the area of the overlapping area is S1, the area of the front projection of the first battery monomer 1201 is S2, 50%≤S1 / S2≤80%.

[0199] The ratio of the area of the overlapping area to the area of the front projection of the first battery monomer 1201 can be any value between greater than or equal to 50% and less than or equal to 80%, for example, any one of 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, etc. or a range value between any two of them.

[0200] In the above scheme, when S1 / S2≥50%, the heat exchange efficiency of the first battery monomer 1201 is low, and the risk of the temperature difference between the first battery monomer 1201 and the second battery monomer 1202 being too large due to the excessive heat exchange efficiency of the first battery monomer 1201 is low, and the reliability of the battery device 100 is high; when S1 / S2≤80%, the first battery monomer 1201 can have a higher heat exchange efficiency, therefore, when 50%≤S1 / S2≤80%, the first battery monomer 1201 can have a higher heat exchange efficiency while the reliability of the battery device 100 can be improved.

[0201] According to some embodiments of the present application, please refer to Figures 7-9 The thermal management component 13 carries the battery monomer assembly.

[0202] The thermal management component 13 carrying the battery monomer assembly means that the thermal management component 13 has the functions of adjusting the temperature of the battery monomer 12 and carrying the battery monomer 12, and saves the space occupied by arranging an additional carrier.

[0203] In the above scheme, the thermal management component 13 can not only be used to adjust the temperature of the battery monomer 12, but also be used to carry the battery monomer assembly, so that the structure of the battery device 100 is more compact, which is conducive to making the battery device 100 have a higher energy density.

[0204] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13The heat management component 13 has a flow channel 133 containing a heat exchange medium. The heat management component 13 further includes a medium inlet 134 and a medium outlet 135, both of which are in communication with the flow channel 133. The positive projection of the battery cell assembly on the heat management component 13 is a first projection 120. The medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 in the first direction X. Among the plurality of battery cells 12, two battery cells 12 located at the two ends are a first end battery cell 1203 and a second end battery cell 1204. The first end battery cell 1203 is closer to the medium inlet 134 and the medium outlet 135 than the second end battery cell 1204. The first end battery cell 1203 at least partially overlaps the flow channel 133, and the second end battery cell 1204 does not overlap the flow channel 133.

[0205] In some embodiments, a first thermal insulation pad 14 is provided between the first end battery cell 1203 and the heat management component 13, i.e., the first end battery cell 1203 is the first battery cell 1201. The at least one battery cell 12 between the two ends in the first direction X is a second battery cell 1202, and the second battery cell 1202 is not provided with the first thermal insulation pad 14 between the second battery cell 1202 and the heat management component 13.

[0206] The medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 in the first direction X, which also means that the assembly of the medium inlet 134 and the medium outlet 135 will not interfere with the battery cells 12, and is conducive to improving the energy density of the battery device 100.

[0207] In some embodiments, among the plurality of battery cells 12, the battery cells 12 between the first end battery cell 1203 and the second end battery cell 1204 in the first direction X are middle battery cells 12. The area of the second end battery cell 1204 overlapping the flow channel 133 is less than the area of the first end battery cell 1203 overlapping the flow channel 133, and the area of the first end battery cell 1203 overlapping the flow channel 133 is less than the area of the middle battery cell 12 overlapping the flow channel 133.

[0208] In the above scheme, since the medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 in the first direction X, the end cell 12 close to the medium inlet 134 and the medium outlet 135 has a higher risk of excessive temperature difference with the remaining cell 12. The heat exchange efficiency of the heat management component 13 with the cell 12 at the end of at least one end of the cell assembly along the first direction X is set to be less than the heat exchange efficiency with any cell 12 between the two ends along the first direction X, which can significantly reduce the risk of thermal stress concentration of the cell assembly due to excessive temperature difference between the cell 12 at the end and the remaining cell 12.

[0209] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 The flow channel 133 includes a first flow collector 136, a second flow collector 137, a third flow collector 138, a plurality of first branch flow channels 139, and a plurality of second branch flow channels 1310. Along the first direction X, the first flow collector 136 is spaced apart from the second flow collector 137, the first flow collector 136 is located between the medium inlet 134 and the second flow collector 137, the plurality of first branch flow channels 139 are arranged side by side between the first flow collector 136 and the second flow collector 137, and the medium inlet 134 is in communication with the first flow collector 136. Along the first direction X, the second flow collector 137 is spaced apart from the third flow collector 138, the third flow collector 138 is located between the medium outlet 135 and the second flow collector 137, the plurality of second branch flow channels 1310 are arranged side by side between the second flow collector 137 and the third flow collector 138, and the medium outlet 135 is in communication with the third flow collector 138.

[0210] The first flow collector 136, the second flow collector 137, the third flow collector 138, the plurality of first branch flow channels 139, and the plurality of second branch flow channels 1310 can extend in the form of a straight line, a broken line, an arc, etc. That is, the specific configuration of each flow channel 133 is not limited.

[0211] In the above scheme, subdividing the flow channel 133 into flow collectors and branch flow channels can further improve the uniformity of heat exchange of the heat exchange medium.

[0212] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13The heat management component 13 has a first cavity 1311, a second cavity 1312, a third cavity 1313 and a fourth cavity 1314 in sequence. The medium inlet 134 is in communication with the first cavity 1311, and the medium outlet 135 is in communication with the fourth cavity 1314. The first cavity 1311 and the second cavity 1312 are separated by a first partition plate 1315, and the first partition plate 1315 is provided with a first communication port 13151 for communication between the first cavity 1311 and the second cavity 1312. The second cavity 1312 and the third cavity 1313 are separated by a second partition plate 1316, and the second partition plate 1316 is provided with a second communication port 13161 for communication between the second cavity 1312 and the third cavity 1313. The third cavity 1313 and the fourth cavity 1314 are separated by a third partition plate 1317, and the third partition plate 1317 is provided with a third communication port 13171 for communication between the third cavity 1313 and the fourth cavity 1314. The second cavity 1312 is divided into a plurality of first branch flow channels 139 by a plurality of fourth partition plates 1318, and the third cavity 1313 is divided into a plurality of second branch flow channels 1310 by a plurality of fifth partition plates 1319.

[0213] The heat management component 13 is first divided into a plurality of cavities, and then divided into a plurality of flow channels 133, which has lower design and processing costs.

[0214] Similarly, the configuration of each cavity is not specifically limited.

[0215] In the above scheme, the different cavities are sequentially communicated between the medium inlet 134 and the medium outlet 135 by setting the partition plates and the communication ports on the partition plates, which has lower processing cost and higher processing efficiency.

[0216] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 In the same projection plane perpendicular to the second direction Y, the orthographic projection of the first end battery monomer 1203 at least partially overlaps with the orthographic projection of the first cavity 1311; and / or, the orthographic projection of the first end battery monomer 1203 at least partially overlaps with the orthographic projection of the fourth cavity 1314.

[0217] Since the first cavity 1311 is only provided with the medium inlet 134, and the fourth cavity 1314 is only provided with the medium outlet 135, the heat exchange efficiency of the heat exchange medium in the first cavity 1311 and the fourth cavity 1314 is low.

[0218] In the above scheme, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the first end battery monomer 1203 is set to at least partially overlap with the orthographic projection of the first cavity 1311, and / or, the orthographic projection of the fourth cavity 1314, which can keep the heat exchange efficiency of the first end battery monomer 1203 in a low state, and is beneficial to balance the temperature difference of the battery monomer assembly.

[0219] According to some embodiments of the present application, referring to Figures 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 1203 and the second end battery monomer 1204, at least partially overlaps with the orthographic projection of the second cavity 1312; and / or, the orthographic projection of each of the plurality of battery monomers 12, except for the first end battery monomer 1203 and the second end battery monomer 1204, at least partially overlaps with the orthographic projection of the third cavity 1313.

[0220] In some embodiments, the heat exchange area of the flow channel 133 in the second cavity 1312 and the third cavity 1313 is relatively large, while the heat exchange area of the flow channel 133 in the first cavity 1311 and the fourth cavity 1314 is relatively small.

[0221] 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 1203 and the second end battery monomer 1204, is arranged to at least partially overlap with the orthographic projection of the second cavity 1312 and / or the orthographic projection of the third cavity 1313, so that the heat exchange efficiency of the other battery monomers 12 is higher than that of the end battery monomers 12, which is beneficial to balance the temperature difference of the battery monomer assembly.

[0222] According to some embodiments of the present application, referring to Figure 4 and Figures 9-13 The fourth partition plate 1318 has a first end close to the first partition plate 1315, and the first end is spaced apart from the first partition plate 1315. Among the plurality of fourth partition plates 1318, the closer the fourth partition plate 1318 is to the first communication port 13151, the greater the distance between the first end of the fourth partition plate 1318 and the first partition plate 1315.

[0223] The spacing area between the first end and the first partition plate 1315 is wedge-shaped, which has the effect of guiding flow and uniform flow, so that the heat exchange medium can be more quickly and uniformly distributed.

[0224] In the above scheme, since the closer the fourth partition plate 1318 is to the first communication port 13151, the greater the distance between the first end of the fourth partition plate 1318 and the first partition plate 1315, the heat exchange medium can flow more quickly to the rest of the thermal management component 13 during the process of passing through the first communication port 13151 and flowing to the medium outlet 135, thereby improving the heat exchange efficiency.

[0225] According to some embodiments of the present application, referring to Figure 4 and Figures 9-13The second cavity 1312 has a first inner wall 1320 opposite the first partition 1315 in the first direction X. The fourth partition 1318 has a second end close to the first inner wall 1320, and the second end is spaced apart from the first inner wall 1320. Among the plurality of fourth partitions 1318, the fourth partition 1318 closer to the second communication port 13161 has a greater distance between the second end and the first inner wall 1320.

[0226] The spacing area between the first end and the second partition 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.

[0227] In the above scheme, since the fourth partition 1318 closer to the second communication port 13161 has a greater distance between the second end and the first inner wall 1320, the heat exchange medium can flow more quickly to the rest of the heat management component 13 during the process of passing through the second communication port 13161 and flowing to the medium outlet 135, thereby improving the heat exchange efficiency.

[0228] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 The fifth partition 1319 has a third end close to the third partition 1317, and the third end is spaced apart from the third partition 1317. Among the plurality of fifth partitions 1319, the fifth partition 1319 closer to the third communication port 13171 has a greater distance between the third end and the fifth partition 1319.

[0229] The spacing area between the third end and the fifth partition 1319 is wedge-shaped, which has the effect of guiding flow and uniform flow. The heat exchange medium can be more quickly and uniformly distributed.

[0230] In some embodiments, the third partition 1317 and the first partition 1315 are integrally formed.

[0231] In the above scheme, since the fifth partition 1319 closer to the third communication port 13171 has a greater distance between the third end and the fifth partition 1319, the heat exchange medium can flow more quickly through the third communication port 13171 and flow to the medium outlet 135, thereby improving the heat exchange efficiency.

[0232] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 The third cavity 1313 has a second inner wall 1321 opposite the fifth partition 1319 in the first direction X. The fifth partition 1319 has a fourth end close to the second inner wall 1321, and the fourth end is spaced apart from the second inner wall 1321. Among the plurality of fifth partitions 1319, the fifth partition 1319 closer to the second communication port 13161 has a greater distance between the fourth end and the second inner wall 1321.

[0233] In some embodiments, the first inner wall 1320 and the second inner wall 1321 are integrally formed.

[0234] The spacing region between the fourth end and the second inner wall 1321 is wedge-shaped, which has the effect of guiding and equalizing flow, so that the heat exchange medium can be more quickly and evenly distributed.

[0235] In the above scheme, the closer the fifth partition plate 1319 is to the second communication port 13161, the greater the distance between the fourth end and the second inner wall 1321. During the process of the heat exchange medium passing through the second communication port 13161 and flowing to the medium outlet 135, the heat exchange medium can flow more quickly to the rest of the thermal management component 13, thereby improving the heat exchange efficiency.

[0236] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 The thermal management component 13 further includes a fifth cavity 1322 and a sixth cavity 1323. The fifth cavity 1322 is located on the side of the second cavity 1312 away from the first cavity 1311 along the first direction X, and the sixth cavity 1323 is located on the side of the third cavity 1313 away from the fourth cavity 1314. The fifth cavity 1322 and the sixth cavity 1323 are not in communication with the flow channel 133.

[0237] In some embodiments, the fifth cavity 1322 and the sixth cavity 1323 can be isolated from the flow channel 133 by the first inner wall 1320 and the second inner wall 1321.

[0238] In the above scheme, since the fifth cavity 1322 and the sixth cavity 1323 are not in communication with the flow channel 133, the thermal management component 13 has a region with relatively low heat exchange efficiency. Arranging the end battery monomer 12 in this region is conducive to balancing the temperature difference of the battery monomer assembly.

[0239] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 The thermal management component 13 includes a first profile 1324, a second profile 1325, a third profile 1326, a fourth profile 1327, a fifth profile 1328, and a sixth profile 1329. The first profile 1324 has the first cavity 1311, the second profile 1325 has the second cavity 1312, the third profile 1326 has the third cavity 1313, the fourth profile 1327 has the fourth cavity 1314, the fifth profile 1328 has the fifth cavity 1322, and the sixth profile 1329 has the sixth cavity 1323.

[0240] Since the profile naturally has multiple through cavities inside after being processed. In some embodiments, each flow channel described above can be machined at the end of the profile by machining or other methods, please refer to Figures 11-13 and then cooperate with multiple partition plates to form flow channels for the heat exchange medium to flow through.

[0241] The partition plate used as the seal can be connected to the end of the profile by welding.

[0242] In the above scheme, the thermal management component 13 is formed by splicing profiles, which can use the inherent configuration of the profile to form a flow channel, has low cost and high processing efficiency. At the same time, the thermal management component 13 has low deformation and high precision during processing.

[0243] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 In the same projection plane perpendicular to the second direction Y, the orthographic projection of the second end battery cell 1204 at least partially overlaps the orthographic projection of the fifth cavity 1322; and / or, the orthographic projection of the second end battery cell 1204 at least partially overlaps the orthographic projection of the sixth cavity 1323.

[0244] Since the fifth cavity 1322 and the sixth cavity 1323 are not communicated with the flow channel 133, the second end battery cell 1204 arranged correspondingly can have relatively low heat exchange efficiency.

[0245] In the above scheme, the temperature difference between each battery cell 12 in the battery cell assembly is relatively small.

[0246] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 Among the plurality of battery cells 12, the two battery cells 12 at both ends are respectively the first end battery cell 1203 and the second end battery cell 1204. 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, 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 1203 is located at one end of the battery cell 12 group close to the first limiting piece 15, and the second end battery cell 1204 is located at one end of the battery cell 12 group close to the second limiting piece 16. The battery device 100 further comprises a second heat insulation pad arranged between the first limiting piece 15 and the first end battery cell 1203; and / or a third heat insulation pad arranged between the second limiting piece 16 and the second end battery cell 1204.

[0247] The heat insulation pad can be arranged at the limiting piece or at the end battery cell 12.

[0248] The limiting piece can be an end plate of the battery cell assembly, or an expansion beam arranged in the battery device 100 to resist the expansion and deformation of the battery cell 12.

[0249] In some embodiments, the material of the second thermal insulation pad can include, but is not limited to, aerogel or foam.

[0250] In some embodiments, the material of the third thermal insulation pad can include, but is not limited to, aerogel or foam.

[0251] The material of the limiting member can be fiber-reinforced material, metal, or composite material, etc.

[0252] In the above scheme, the limiting member increases the heat exchange path between the battery monomer 12 at the end 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 with 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. By setting a thermal insulation pad between the limiting member and the battery monomer 12 at the end, the heat exchange efficiency of the heat management component 13 to the battery monomer 12 at the end 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.

[0253] According to some embodiments of the present application, please refer to Figure 4 and Figures 9-13 , the material of the first limiting member 15 is metal, and / or the material of the second limiting member 16 is metal.

[0254] In the above scheme, since the limiting member made of metal has relatively high thermal conductivity, by setting the second thermal insulation pad and / or the third thermal insulation pad, 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 with 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.

[0255] According to some embodiments of the present application, please refer to Figure 1 , the present application provides a power consumption device, which includes the battery device 100 in one or more of the above embodiments, and the battery device 100 is used to provide electric energy.

[0256] In the above scheme, since the battery device 100 in one or more of the above embodiments has high reliability, the power consumption device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0257] According to some embodiments of the present application, please refer to Figures 4-13The battery device 100 provided by the present application comprises a battery cell assembly, a thermal management component 13, a first thermal insulation pad 14, a second thermal insulation pad, a third thermal insulation pad, a first limiting piece 15 and a second limiting piece 16. 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, and is used for adjusting the temperature of the battery cells 12. The second direction Y intersects the first direction X. The thermal management component 13 bears the battery cell assembly. The thermal management component 13 has a flow channel 133 containing a heat exchange medium. The thermal management component 13 further comprises a medium inlet 134 and a medium outlet 135, both of which are in communication with the flow channel 133. The orthographic projection of the battery cell assembly on the thermal management component 13 is a first projection 120. The medium inlet 134 and the medium outlet 135 are located on the same side of the first projection 120 along the first direction X.

[0258] Among the plurality of battery cells 12, two battery cells 12 located at both ends are a first end battery cell 1203 and a second end battery cell 1204. The first end battery cell 1203 is closer to the medium inlet 134 and the medium outlet 135 than the second end battery cell 1204. The first end battery cell 1203 at least partially overlaps the flow channel 133, and the second end battery cell 1204 does not overlap the flow channel 133.

[0259] The first end battery cell 1203 and the thermal management component 13 are provided with the first thermal insulation pad 14. At least one battery cell 12 of the battery cell assembly located between both ends along the first direction X is a second battery cell 1202. The second battery cell 1202 and the thermal management component 13 are not provided with the first thermal insulation pad 14.

[0260] The thermal management component 13 has a first surface 131 facing the battery cell assembly. The first surface 131 is provided with a groove 132, and at least part of the first thermal insulation pad 14 is located in the groove 132. The battery device 100 further comprises a first adhesive layer 17, which comprises a first region 171 and a second region 172. The first region 171 is arranged between the first thermal insulation pad 14 and the first battery cell 1201, and the second region 172 is arranged between the second battery cell 1202 and the first surface 131. The thickness of the first region 171 and the thickness of the second region 172 are the same.

[0261] The battery device 100 further includes a first expansion beam and a second expansion beam, the first expansion beam and the second expansion beam are arranged at intervals along the first direction X, the plurality of battery cells 12 are arranged between the first expansion beam and the second expansion beam, and the medium inlet 134 and the medium outlet 135 are located on the side of the first expansion beam away from the second expansion beam along the first direction X. The first expansion beam and the second expansion beam are both connected with the thermal management component 13. The battery device 100 further includes a pressing strip 18, the pressing strip 18 extends along the first direction X, both ends of the pressing strip 18 are connected with the first expansion beam and the second expansion beam respectively, and the pressing strip 18 is pressed to the side of the battery cell 12 away from the thermal management component 13.

[0262] The first end battery cell 1203 is located at one end of the battery cell 12 group close to the first expansion beam, and the second end battery cell 1204 is located at one end of the battery cell 12 group close to the second expansion beam. The flow channel 133 includes a first flow channel 136, a second flow channel 137, a third flow channel 138, a plurality of first branch flow channels 139, and a plurality of second branch flow channels 1310. In the first direction X, the first flow channel 136 is spaced apart from the second flow channel 137, the first flow channel 136 is located between the medium inlet 134 and the second flow channel 137, the plurality of first branch flow channels 139 are arranged side by side between the first flow channel 136 and the second flow channel 137, and the medium inlet 134 is in communication with the first flow channel 136. In the first direction X, the second flow channel 137 is spaced apart from the third flow channel 138, the third flow channel 138 is located between the medium outlet 135 and the second flow channel 137, the plurality of second branch flow channels 1310 are arranged side by side between the second flow channel 137 and the third flow channel 138, and the medium outlet 135 is in communication with the third flow channel 138. The thermal management component 13 has a first cavity 1311, a second cavity 1312, a third cavity 1313, and a fourth cavity 1314 in sequence. The medium inlet 134 is in communication with the first cavity 1311, and the medium outlet 135 is in communication with the fourth cavity 1314. The first cavity 1311 and the second cavity 1312 are separated by a first partition plate 1315, and the first partition plate 1315 is provided with a first communication port 13151 for communicating the first cavity 1311 and the second cavity 1312. The second cavity 1312 and the third cavity 1313 are separated by a second partition plate 1316, and the second partition plate 1316 is provided with a second communication port 13161 for communicating the second cavity 1312 and the third cavity 1313. The third cavity 1313 and the fourth cavity 1314 are separated by a third partition plate 1317, and the third partition plate 1317 is provided with a third communication port 13171 for communicating the third cavity 1313 and the fourth cavity 1314. The second cavity 1312 is divided into a plurality of first branch flow channels 139 by a plurality of fourth partition plates 1318, and the third cavity 1313 is divided into a plurality of second branch flow channels 1310 by a plurality of fifth partition plates 1319. The thermal management component 13 further includes a fifth cavity 1322 and a sixth cavity 1323, and the fifth cavity 1322 is located on the side of the second cavity 1312 away from the first cavity 1311 in the first direction X, and the sixth cavity 1323 is located on the side of the third cavity 1313 away from the fourth cavity 1314, and the fifth cavity 1322 and the sixth cavity 1323 are not in communication with the flow channel 133. In the same projection plane perpendicular to the second direction Y, the orthographic projection of the second end battery cell 1204 at least partially overlaps the orthographic projection of the fifth cavity 1322, and the orthographic projection of the second end battery cell 1204 at least partially overlaps the orthographic projection of the sixth cavity 1323.

[0263] A second thermal pad is disposed between the first end battery cell 1203 and the thermal management member 13, and a third thermal pad is disposed between the second end battery cell 1204 and the thermal management member 13. A second thermal pad is disposed between the first expansion beam and the first end battery cell 1203, and a third thermal pad is disposed between the second expansion beam and the second end battery cell 1204.

[0264] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions recorded in the above-mentioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description 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 way. 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 by, The battery device comprises: a battery cell assembly comprising a plurality of battery cells arranged along a first direction; a thermal management component arranged on one side of the battery cell assembly along a second direction for adjusting the temperature of the battery cell assembly, the second direction intersecting the first direction; wherein the heat exchange efficiency of the battery cell located at the end of the battery cell assembly at least one of the two ends along the first direction of the thermal management component and the battery cell assembly is less than the heat exchange efficiency of any battery cell located between the two ends along the first direction.

2. The battery device according to claim 1, characterized by Among the plurality of battery cells, the plurality of battery cells comprise at least one first battery cell and at least one second battery cell; a first thermal insulation pad is arranged between the first battery cell and the thermal management component, and no first thermal insulation pad is arranged between the second battery cell and the thermal management component, at least one of the first battery cell is the battery cell at the end of the battery cell assembly, and at least one of the second battery cell is the battery cell located between the two ends along the first direction of the battery cell assembly.

3. The battery device of claim 2, wherein, The thermal management component has a first surface facing the battery cell assembly, and the first surface is provided with a groove, and at least part of the first thermal insulation pad is located in the groove.

4. The battery device of claim 3, wherein The first thermal insulation pad has a second surface facing the first battery cell, and the second surface is flush with the first surface.

5. The battery device of claim 3, wherein The battery device further comprises a first adhesive layer, the first adhesive layer comprises a first region and a second region, the first region is arranged between the first thermal insulation pad and the first battery cell, and the second region is arranged between the second battery cell and the first surface.

6. The battery device of claim 5, wherein, The first thermal insulation pad is in contact with the groove side wall of the groove.

7. The battery device of claim 5, wherein The thickness of the first region and the thickness of the second region are the same.

8. The battery device of claim 5, wherein, The thickness of the first adhesive layer is H1, and satisfies: 0.8mm≤H1≤1.5mm.

9. The battery device of claim 3, wherein The first thermal insulation pad is connected to the groove bottom wall of the groove through a second adhesive layer.

10. The battery device of claim 2, wherein 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, the medium inlet and the medium outlet are in communication with the flow channel, the battery cell assembly has a first projection on the thermal management component, the medium inlet and the medium outlet are located on the same side of the first projection in the first direction; The first battery cell is closer to the medium inlet and the medium outlet than the second battery cell.

11. The battery device of claim 10, wherein, 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 at intervals along the first direction, and a plurality of battery cells are arranged between the first limiting member and the second limiting member; The medium inlet and the medium outlet are located on the side of the first limiting member away from the second limiting member along the first direction.

12. The battery device of claim 11, wherein, The first limiting member and the second limiting member are connected with the thermal management component.

13. The battery device of claim 11, wherein, The battery device further comprises a pressing strip extending along the first direction, two ends of the pressing strip being connected to the first limiting member and the second limiting member respectively, and the pressing strip being pressed against the side of the battery cell away from the thermal management component.

14. The battery device of claim 2, wherein, The first thermal insulation pad has a thickness H2, and 0.5mm≤H2≤1.2mm.

15. The battery device of claim 2, wherein, The first thermal insulation pad is made of aerogel or foam.

16. The battery device of claim 2, wherein, In the same projection plane perpendicular to the second direction, the first thermal insulation pad has an overlapping area with the first battery cell, the area of the overlapping area is S1, and the area of the first battery cell is S2, and 50%≤S1 / S2≤80%.

17. The battery device of claim 1, wherein, The thermal management component carries the battery cell assembly.

18. The battery device of claim 1, wherein, 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 first 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. 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 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.

19. The battery device of claim 18, 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 spaced apart from 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 spaced apart from 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.

20. The battery device of claim 19, wherein, The thermal 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.

21. The battery device of claim 20, wherein, In the same projection plane perpendicular to the second direction, the front projection of the first end battery cell at least partially overlaps with the front projection of the first cavity; And / or, the front projection of the first end battery cell at least partially overlaps with the front projection of the fourth cavity.

22. The battery device of claim 20, wherein, In the same projection plane perpendicular to the second direction, the front 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 the front projection of the second cavity; And / or, the front 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 the front projection of the third cavity.

23. The battery device of claim 20, wherein, 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.

24. The battery device of claim 20, wherein, Along the first direction, the second cavity has a first inner wall opposite the first partition plate; 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.

25. The battery device of claim 20, wherein, 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; 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.

26. The battery device of claim 20, wherein, Along the first direction, the third cavity has a second inner wall opposite the fifth partition plate; 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.

27. The battery device of claim 20, wherein, 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.

28. The battery device of claim 27, wherein, The thermal 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.

29. The battery device of claim 27, wherein, In the same projection plane perpendicular to the second direction, the front projection of the second end battery cell at least partially overlaps with the front projection of the fifth cavity; And / or, the front projection of the second end battery cell at least partially overlaps with the front projection of the sixth cavity.

30. The battery device of claim 1, wherein, 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 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, a plurality of the battery monomers are arranged between the first limiting member and the second limiting member, the first end battery monomer is located at one end of the battery monomer assembly close to the first limiting member, and the second end battery monomer is located at one end of the battery monomer assembly close to the second limiting member; a second heat insulation pad arranged between the first limiting member and the first end battery monomer; and / or a third heat insulation pad arranged between the second limiting member and the second end battery monomer.

31. The battery device of claim 30, wherein, The first limiting member is made of metal, and / or the second limiting member is made of metal.

32. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-31, and the battery device is used for providing electric energy.

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