Battery and electric device

Abstract

The battery (100) comprises a plurality of battery monomers (10), the plurality of battery monomers (10) are arranged in a stack along a first direction (X), the plurality of battery monomers (10) comprise two first battery monomers (11) located at both ends along the first direction (X), at least one first thermal management component (20) is arranged between two adjacent battery monomers (10), and at least one second thermal management component (30) is arranged on the side of the at least one first battery monomer (11) away from the first thermal management component (20) along the first direction (X); along the first direction (X), the thickness of the at least one second thermal management component (30) is less than the thickness of the at least one first thermal management component (20), so that the amount of compression of the at least one second thermal management component (30) along the first direction (X) matches the expansion amount of the first battery monomer (11) in the direction away from the first thermal management component (20), meets the expansion requirement of the first battery monomer (11) in the direction away from the first thermal management component (20), and can also reduce the space occupied by the second thermal management component (30) in the first direction (X), which is conducive to improving the energy density of the battery (100).

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0002] Currently, rechargeable batteries, such as lithium-ion batteries, sodium-ion batteries, and solid-state batteries, possess outstanding advantages such as high energy density and good cycle performance, and are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. With the widespread use of batteries, the performance requirements for them are constantly increasing, especially their energy density. Therefore, how to improve battery energy density has become an urgent problem to be solved in the field of battery technology. Summary of the Invention

[0003] This application provides a battery and an electrical device to improve the energy density of the battery.

[0004] In a first aspect, embodiments of this application provide a battery comprising a plurality of battery cells stacked along a first direction, the plurality of battery cells including two first battery cells located at both ends along the first direction, at least one first thermal management component disposed between two adjacent battery cells, and at least one second thermal management component disposed on the side of at least one first battery cell away from the first thermal management component along the first direction; wherein, along the first direction, the thickness of the at least one second thermal management component is less than the thickness of the at least one first thermal management component.

[0005] In the above technical solution, when the first battery cell expands in the direction away from the first thermal management component, the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component can be compressed along the first direction to absorb the expansion of the first battery cell in the direction away from the first thermal management component. The thickness of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component as a whole is less than the thickness of the at least one first thermal management component disposed between two adjacent battery cells as a whole. This makes the amount of compression of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component in the first direction match the amount of expansion of the first battery cell in the direction away from the first thermal management component, thus satisfying the expansion requirement of the first battery cell in the direction away from the first thermal management component and reducing the space occupied by the second thermal management component in the first direction, which is beneficial to improving the energy density of the battery. Furthermore, since the first thermal management component needs to absorb the expansion of the battery cells on both sides along the first direction, and the second thermal management component only absorbs the expansion of the first battery cell on one side along the first direction, the thickness of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component, as a whole, is less than the thickness of the at least one first thermal management component disposed between two adjacent battery cells, when the first thermal management component is compressed to its limit along the first direction, the second thermal management component is also compressed to its limit along the first direction, or the space in which the second thermal management component can still be compressed along the first direction is very small. This ensures that after the first thermal management component is compressed to its limit along the first direction, the first battery cell cannot continue to expand in the direction away from the first thermal management component, or the expansion amount of the first battery cell in the direction away from the first thermal management component will be very small. This is beneficial for the expansion amount of the first battery cell and the battery cell located between two first battery cells to be consistent along the first direction, reducing the risk that the first battery cell's casing will be damaged due to expansion because the first battery cell's expansion amount in the first direction is larger due to the larger compressibility of the second thermal management component along the first direction.

[0006] In some embodiments of the first aspect of this application, the battery further includes two fixing portions located on both sides of the plurality of battery cells along the first direction, the at least one first thermal management component abutting between two adjacent battery cells, and the at least one second thermal management component abutting between the fixing portion and the first battery cell.

[0007] In the above technical solution, the battery also includes two fixing parts, which are located on both sides of the plurality of battery cells along the first direction. The at least one first thermal management component abuts between two adjacent battery cells, and the at least one second thermal management component abuts between the fixing part and the first battery cell. The fixing part can limit the overall structure formed by all battery cells, the first thermal management component and the second thermal management component, which is conducive to the stable installation of battery cells, the first thermal management component and the second thermal management component, so as to maintain the stability of the relative positional relationship between battery cells, the first thermal management component and the second thermal management component.

[0008] In some embodiments of the first aspect of this application, the battery further includes a housing, in which the plurality of battery cells, the at least one first thermal management component, and the at least one second thermal management component are housed; the housing includes two first sidewalls arranged opposite to each other along the first direction, the first sidewalls forming the fixing portion.

[0009] In the above technical solution, the first side wall of the box forms a fixing part, so there is no need to set up a separate structure to form a fixing part, which helps to simplify the battery structure and reduce the weight of the battery.

[0010] In some embodiments of the first aspect of this application, the battery further includes a housing, in which the plurality of battery cells, the at least one first thermal management component, and the at least one second thermal management component are housed; the battery further includes a partition beam, which is mounted in the housing and forms the fixing portion.

[0011] In the above technical solution, a partition beam is installed inside the box. The partition beam forms a fixed part, so the expansion force of each battery cell when it expands is indirectly applied to the partition beam, reducing the damage to the box caused by the expansion force of the battery cell when it expands.

[0012] In some embodiments of the first aspect of this application, the battery further includes a barrier member that abuts against the at least one second thermal management component and the fixing portion along the first direction, wherein the thermal resistance of the barrier member is greater than the thermal resistance of the second thermal management component.

[0013] In the above technical solution, the barrier abuts against at least one second thermal management component and the fixing part, and the thermal resistance of the barrier is greater than that of the second thermal management component. The barrier can effectively prevent heat transfer between the second thermal management component and the blocking part, so that the second thermal management component is difficult to exchange heat with the fixing part, thereby enabling the second thermal management component to efficiently exchange heat with the first battery cell, thereby regulating the temperature of the first battery cell.

[0014] In some embodiments of the first aspect of this application, a first thermal management component is disposed between two adjacent battery cells; and / or, a second thermal management component is disposed on the side of the first battery cell away from the first thermal management component along the first direction.

[0015] In the above technical solutions, if a first thermal management component is arranged between two adjacent battery cells, the temperature of the battery cell can be regulated using the minimum number of first thermal management components. This simplifies the battery structure, reduces the battery volume, and saves battery costs. It also reduces the space occupied by all the first thermal management components, which helps to improve the battery's energy density. If a second thermal management component is arranged on the side of the first battery cell away from the first thermal management component along the first direction, the temperature of the battery cell can be regulated using the minimum number of second thermal management components. This simplifies the battery structure, reduces the battery volume, and saves battery costs. It also reduces the space occupied by all the second thermal management components, which helps to improve the battery's energy density.

[0016] In some embodiments of the first aspect of this application, the thickness of the second thermal management component is less than the thickness of the first thermal management component along the first direction.

[0017] In the above technical solution, the thickness of the second thermal management component along the first direction is less than the thickness of the first thermal management component along the first direction, which can reduce the space occupied by the second thermal management component in the first direction and is beneficial to improving the energy density of the battery.

[0018] In some embodiments of the first aspect of this application, a first flow channel for accommodating heat exchange medium is formed inside the first thermal management component.

[0019] In the above technical solution, a first flow channel for accommodating the heat exchange medium is formed inside the first thermal management component. The heat exchange medium is contained within the first flow channel, enabling the first thermal management component to regulate the temperature of the battery cell. The first flow channel also provides space for the first thermal management component to compress along a first direction, allowing the first thermal management component to absorb the expansion of the battery cell through compression, thereby meeting the expansion requirements of the battery cell.

[0020] In some embodiments of the first aspect of this application, a plurality of first flow channels are formed inside the first thermal management component, and the plurality of first flow channels are arranged side by side along a second direction, the second direction being perpendicular to the first direction.

[0021] In the above technical solution, multiple first flow channels are formed inside the first thermal management component, arranged side by side along the second direction, which facilitates the control of the flow rate and flow volume of the heat exchange medium in the first thermal management component.

[0022] In some embodiments of the first aspect of this application, the first thermal management component includes a first tube body and at least one first partition disposed inside the first tube body, the at least one first partition dividing the internal space of the first tube body into a plurality of first flow channels.

[0023] In the above technical solution, by providing at least one first partition in the internal space of the first tube body, the internal space of the first tube body is divided into multiple first flow channels for accommodating the heat exchange medium, thereby facilitating the control of the flow rate and flow volume of the heat exchange medium in the first thermal management component.

[0024] In some embodiments of the first aspect of this application, along the first direction, the first pipe body includes a first pipe wall and a second pipe wall disposed opposite to each other, and the first partition is obliquely disposed between the first pipe wall and the second pipe wall and connected to the first pipe wall and the second pipe wall.

[0025] In the above technical solution, by tilting the first separator and connecting it between the first pipe wall and the second pipe wall, it is easier for the first thermal management component to be compressed and deformed along the first direction to absorb the expansion of the battery cell, thereby reducing the difficulty of compressing the first thermal management component along the first direction.

[0026] In some embodiments of the first aspect of this application, the first separator has opposing first and second surfaces in its thickness direction, and along the first direction, the first pipe wall has a third surface facing the first flow channel, and the second pipe wall has a fourth surface facing the first flow channel; the first surface is set at an acute angle and an obtuse angle with the third surface and the fourth surface, respectively, and the second surface is set at an obtuse angle and an acute angle with the third surface and the fourth surface, respectively; wherein the first surface and the third surface are connected by a first chamfered surface; and / or, the second surface and the fourth surface are connected by a second chamfered surface.

[0027] In the above technical solution, the first surface of the first partition member is set at an acute angle to the third surface of the first pipe wall and connected by a first chamfered surface, and / or the second surface of the first partition member is set at an acute angle to the fourth surface of the second pipe wall and connected by a second chamfered surface. This can increase the thickness of the part of the first partition member connected to the first pipe wall and the part of the first partition member connected to the second pipe wall in the second direction. This can improve the connection stability and reliability between the first partition member and the pipe wall on the one hand, and alleviate the problem of cracks appearing between the first partition member and the pipe wall on the other hand.

[0028] In some embodiments of the first aspect of this application, the battery further includes a first busbar and a second busbar. The first busbar has a first busbar chamber formed inside, and the second busbar has a second busbar chamber formed inside. The first busbar and the second busbar are respectively connected to the two ends of the first thermal management component along a third direction. Each first flow channel communicates with the first busbar chamber and with the second busbar chamber. The third direction, the second direction, and the first direction are perpendicular to each other. Among the plurality of first flow channels, the two first flow channels located at the ends along the second direction are respectively a first end flow channel and a second end flow channel. The cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is smaller than the cross-sectional area of ​​the other first flow channels.

[0029] In the above technical solution, at least one of the two first flow channels (first end flow channel and second end flow channel) located at the end along the second direction has a smaller cross-sectional area than the other first flow channels. This results in a larger flow resistance at least one first flow channel located at the end. The heat exchange medium flowing out of one of the first and second manifolds can be distributed to the first flow channel located between the first and second end flow channels, which is beneficial for distributing sufficient heat exchange medium to each first flow channel and thus improving the uniformity of heat exchange.

[0030] In some embodiments of the first aspect of this application, the cross-sectional area of ​​at least one of the first end channel and the second end channel is the smallest among the plurality of first channels.

[0031] In the above technical solution, at least one of the first end flow channel and the second end flow channel has the smallest cross-sectional area among the multiple first flow channels. Therefore, the flow resistance of the flow channel with the smallest cross-sectional area is the largest, making it easier for the heat exchange medium to flow into the first flow channel located between the first and second end flow channels. This facilitates the distribution of sufficient heat exchange medium to each first flow channel, thereby improving the uniformity of heat exchange. Since the cross-sectional areas of the first and second end flow channels are the smallest among the multiple first flow channels, when the battery cell expands, the compressibility of the first thermal management component in the corresponding region along the first direction of the first and second end flow channels is smaller than that in the region between the first and second end flow channels. This matches the expansion amount of different regions of the battery cell along the second direction, thus meeting the expansion requirements of different regions of the battery cell.

[0032] In some embodiments of the first aspect of this application, the second thermal management component has a second flow channel formed inside to accommodate the heat exchange medium, and the size of the second flow channel is smaller than the size of the first flow channel along the first direction.

[0033] In the above technical solution, a second flow channel for accommodating the heat exchange medium is formed inside the second thermal management component. The heat exchange medium is contained within the second flow channel, enabling the second thermal management component to regulate the temperature of the battery cells. The second flow channel also provides space for the second thermal management component to compress along the first direction, allowing it to absorb the expansion of the first battery cell in the direction away from the first thermal management component through compression, thereby meeting the expansion requirements of the first battery cell in that direction. Along the first direction, the size of the second flow channel is smaller than that of the first flow channel, which helps reduce the thickness of the second thermal management component along the first direction, thereby reducing the space occupied by the second thermal management component in the first direction and improving the energy density of the battery.

[0034] In some embodiments of the first aspect of this application, a second flow channel for accommodating heat exchange medium is formed inside the second thermal management component.

[0035] In the above technical solution, a second flow channel for accommodating the heat exchange medium is formed inside the second thermal management component. The heat exchange medium is contained within the second flow channel, enabling the second thermal management component to regulate the temperature of the first battery cell. The second flow channel also provides space for the second thermal management component to be compressed along the first direction, allowing the second thermal management component to absorb the expansion of the first battery cell in the direction away from the first thermal management component through compression, thereby meeting the expansion requirements of the first battery cell in the direction away from the first thermal management component.

[0036] In some embodiments of the first aspect of this application, a plurality of second flow channels are formed inside the second thermal management component, and the plurality of second flow channels are arranged side by side along a second direction, the second direction being perpendicular to the first direction.

[0037] In the above technical solution, multiple second flow channels are formed inside the second thermal management component, arranged side by side along the second direction, which facilitates the control of the flow rate and flow volume of the heat exchange medium in the second thermal management component.

[0038] In some embodiments of the first aspect of this application, the second thermal management component includes a second tube body and at least one second partition disposed inside the second tube body, the at least one second partition dividing the internal space of the second tube body into a plurality of second flow channels.

[0039] In the above technical solution, by providing at least one second partition in the internal space of the second tube, the internal space of the second tube is divided into multiple second flow channels for accommodating the heat exchange medium, thereby facilitating the control of the flow rate and volume of the heat exchange medium in the second thermal management component.

[0040] In some embodiments of the first aspect of this application, along the first direction, the second pipe body includes a third pipe wall and a fourth pipe wall disposed opposite to each other, and the second separator is obliquely disposed between the third pipe wall and the fourth pipe wall and connected to the third pipe wall and the fourth pipe wall.

[0041] In the above technical solution, by tilting the second separator and connecting it between the third and fourth pipe walls, it is easier for the second thermal management component to be compressed and deformed along the first direction to absorb the expansion of the first battery cell, thereby reducing the difficulty of compressing the second thermal management component along the first direction.

[0042] In some embodiments of the first aspect of this application, the second separator has opposing fifth and sixth surfaces in its thickness direction, and along the first direction, the third pipe wall has a seventh surface facing the second flow channel, and the fourth pipe wall has an eighth surface facing the second flow channel; the fifth surface is set at an acute angle and an obtuse angle to the seventh surface and the eighth surface, respectively, and the sixth surface is set at an obtuse angle and an acute angle to the seventh surface and the eighth surface, respectively; wherein the fifth surface and the seventh surface are connected by a third chamfered surface; and / or, the sixth surface and the eighth surface are connected by a fourth chamfered surface.

[0043] In the above technical solution, the fifth surface of the second partition is set at an acute angle to the seventh surface of the third pipe wall and connected through a third chamfered surface, and / or the sixth surface of the second partition is set at an acute angle to the eighth surface of the fourth pipe wall and connected through a fourth chamfered surface. This can increase the thickness of the part of the second partition connected to the third pipe wall and the part of the second partition connected to the fourth pipe wall in the second direction. This can improve the connection stability and reliability between the second partition and the pipe wall on the one hand, and alleviate the problem of cracks appearing between the second partition and the pipe wall on the other hand.

[0044] In some embodiments of the first aspect of this application, the battery further includes a third busbar and a fourth busbar. The third busbar has a third busbar chamber formed inside, and the fourth busbar has a fourth busbar chamber formed inside. The third busbar and the fourth busbar are respectively connected to the two ends of the second thermal management component along a third direction. Each second flow channel communicates with the third busbar chamber and the fourth busbar chamber. The third direction, the second direction, and the first direction are perpendicular to each other. Among the plurality of second flow channels, the two second flow channels located at the ends along the second direction are respectively the third end flow channel and the fourth end flow channel. The cross-sectional area of ​​at least one of the third end flow channel and the fourth end flow channel is smaller than the cross-sectional area of ​​the other second flow channels.

[0045] In the above technical solution, at least one of the two second flow channels (the third end flow channel and the fourth end flow channel) located at the end along the second direction has a smaller cross-sectional area than the other second flow channels. This results in a larger flow resistance in at least one second flow channel located at the end. The heat exchange medium flowing out from one of the third and fourth manifolds can be distributed to the second flow channel located between the third and fourth end flow channels, which is beneficial for distributing sufficient heat exchange medium to each second flow channel and thus improving the uniformity of heat exchange.

[0046] In some embodiments of the first aspect of this application, at least one of the third end channel and the fourth end channel has the smallest cross-sectional area among the plurality of second channels.

[0047] In the above technical solution, at least one of the third and fourth end channels has the smallest cross-sectional area among the multiple second channels. Therefore, the channel with the smallest cross-sectional area has the greatest flow resistance, making it easier for the heat exchange medium to flow into the second channel located between the third and fourth end channels. This facilitates the distribution of sufficient heat exchange medium to each second channel, thereby improving the uniformity of heat exchange. Since the cross-sectional areas of the third and fourth end channels are the smallest among the multiple second channels, when the first battery cell expands, the compressibility of the second thermal management component in the corresponding region along the first direction in the third and fourth end channels is smaller than that in the region between the third and fourth end channels. This matches the expansion amount of different regions of the first battery cell along the second direction, satisfying the expansion requirements of different regions of the first battery cell.

[0048] Secondly, embodiments of this application also provide an electrical device, including the battery provided in any of the embodiments of the first aspect. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0051] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0052] Figure 3 A schematic diagram illustrating the interaction between a battery cell, a first thermal management component, and a second thermal management component, provided in some embodiments of this application;

[0053] Figure 4 This is a schematic diagram showing the interaction between a battery cell, a first thermal management component, and a second thermal management component, provided in some other embodiments of this application.

[0054] Figure 5 A cross-sectional view of a battery cell, a first thermal management component, and a second thermal management component assembled according to some embodiments of this application;

[0055] Figure 6 A cross-sectional view of a battery provided for some embodiments of this application;

[0056] Figure 7 Cross-sectional views of batteries provided for other embodiments of this application;

[0057] Figure 8 A cross-sectional view of a battery provided in some embodiments of this application;

[0058] Figure 9 A cross-sectional view of a battery provided for some embodiments of this application;

[0059] Figure 10 This is a schematic diagram of the structure of a first thermal management component provided in some embodiments of this application;

[0060] Figure 11 for Figure 10 Enlarged view of point A in the middle;

[0061] Figure 12 This is a schematic diagram of the structure of a second thermal management component provided in some embodiments of this application;

[0062] Figure 13 for Figure 12 Enlarged view of point B in the middle.

[0063] Icons: 1000 - Vehicle; 100 - Battery; 10 - Battery cell; 11 - First battery cell; 12 - First side surface; 20 - First thermal management component; 21 - First flow channel; 22 - First tube body; 221 - First tube wall; 2211 - Third surface; 222 - Second tube wall; 2221 - Fourth surface; 223 - First bent wall; 224 - Second bent wall; 225 - First chamfered surface; 226 - Second chamfered surface; 23 - First separator; 231 - First surface; 232 - Second surface; 30 - Second thermal management component; 31 - Second flow channel; 32 - Second tube body; 321 - Third tube wall; 3211 - Seventh surface; 322 - Fourth tube wall; 3221 - Eighth surface; 323 - Third bent wall; 324 - Fourth bent wall; 235 - Third chamfered surface; 236 - Fourth chamfered surface; 33 - Second partition; 331 - Fifth surface; 332 - Sixth surface; 40 - Fixing part; 50 - Housing; 51 - First side wall; 52 - First part; 53 - Second part; 54 - Bottom wall; 60 - Partition beam; 70 - Barrier; 80 - First busbar; 81 - First busbar chamber; 82 - First medium inlet; 90 - Second busbar; 91 - Second busbar chamber; 92 - First medium outlet; 110 - Third busbar; 1101 - Third busbar chamber; 1102 - Second medium inlet; 120 - Fourth busbar; 1201 - Fourth busbar chamber; 1202 - Second medium outlet; 200 - Controller; 300 - Motor; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0065] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0066] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0067] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0068] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0069] In this application, "multiple" means two or more (including two).

[0070] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0071] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0072] A battery cell consists of a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0073] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0074] The inventors discovered that in typical power batteries, multiple battery cells are usually arranged in an array within the battery casing to provide sufficient power. However, these individual cells generate a significant amount of heat during continuous charging and discharging, causing the internal temperature of the battery to rise. The stacked arrangement of multiple cells exacerbates this phenomenon, severely impacting battery performance and lifespan. In severe cases, it can lead to fires, explosions, and other safety hazards, compromising electrical safety. Therefore, thermal management components are typically placed inside the battery. A central thermal management component can be placed between adjacent battery cells along the stacking direction, and an end thermal management component can be placed on the side of the end battery cell facing away from its adjacent cell. During battery cell expansion, the thermal management component can absorb the expansion by being compressed and deformed along the stacking direction. The central thermal management component needs to absorb the expansion of the battery cells on both sides, while the end thermal management component only needs to absorb the expansion of the battery cell on one side. Therefore, the actual compression amount of the end wall thermal management component is only half that of the central thermal management component. However, in related technologies, the thickness of the end thermal management component is the same as that of the central thermal management component along the stacking direction. This not only makes the thickness of the end thermal management component much greater than the maximum compression amount that the end thermal management component needs to be compressed along the stacking direction, but also causes the end thermal management component to occupy a larger space along the stacking direction, reducing the battery's energy density.

[0075] Based on the above considerations, in order to alleviate the problem of low battery energy density caused by the large space occupied by the end thermal management components in related technologies, the inventors have conducted in-depth research and designed a battery. The battery includes multiple battery cells stacked along a first direction. The multiple battery cells include two first battery cells located at both ends along the first direction. At least one first thermal management component is disposed between two adjacent battery cells. At least one second thermal management component is disposed on the side of at least one first battery cell facing away from the first thermal management component along the first direction X. Along the first direction X, the thickness of the at least one second thermal management component is less than the thickness of the at least one first thermal management component.

[0076] When the first battery cell expands in the direction away from the first thermal management component, the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component can be compressed along the first direction to absorb the expansion of the first battery cell in the direction away from the first thermal management component. The thickness of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component as a whole is less than the thickness of the at least one first thermal management component disposed between two adjacent battery cells as a whole. This is to match the amount of compression of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component along the first direction with the amount of expansion of the first battery cell in the direction away from the first thermal management component, thereby satisfying the expansion requirement of the first battery cell in the direction away from the first thermal management component and reducing the space occupied by the second thermal management component in the first direction, which is beneficial to improving the energy density of the battery.

[0077] Furthermore, since the first thermal management component needs to absorb the expansion of the battery cells on both sides along the first direction, and the second thermal management component only absorbs the expansion of the first battery cell on one side along the first direction, the thickness of the at least one second thermal management component disposed on the side of the first battery cell away from the first thermal management component, as a whole, is less than the thickness of the at least one first thermal management component disposed between two adjacent battery cells, when the first thermal management component is compressed to its limit along the first direction, the second thermal management component is also compressed to its limit along the first direction, or the space in which the second thermal management component can still be compressed along the first direction is very small. This ensures that after the first thermal management component is compressed to its limit along the first direction, the first battery cell cannot continue to expand in the direction away from the first thermal management component, or the expansion amount of the first battery cell in the direction away from the first thermal management component will be very small. This is beneficial for the expansion amount of the first battery cell and the battery cell located between two first battery cells to be consistent along the first direction, reducing the risk that the first battery cell's casing will be damaged due to expansion because the first battery cell's expansion amount in the first direction is larger due to the larger compressibility of the second thermal management component along the first direction.

[0078] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. The power system of such electrical equipment can be composed using batteries disclosed in this application, which is beneficial for reducing the space occupied by end-effector thermal management components and improving the energy density of the battery.

[0079] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0081] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0082] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] like Figure 2 , Figure 3 , Figure 4 As shown, in some embodiments, the battery 100 includes a plurality of battery cells 10, which are stacked along a first direction X. Each battery cell 10 includes two first battery cells 11 located at both ends along the first direction X. At least one first thermal management component 20 is disposed between two adjacent battery cells 10. At least one second thermal management component 30 is disposed on the side of the at least one first battery cell 11 facing away from the first thermal management component 20 along the first direction X. The thickness of the at least one second thermal management component 30 is less than the thickness of the at least one first thermal management component 20 along the first direction X.

[0084] A battery cell 10 refers to the smallest unit that makes up the battery 100. "Multiple" refers to two or more. Multiple battery cells 10 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel. The battery 100 may also include other structures; for example, the battery 100 may also include a busbar (not shown in the figure) for electrical connection between multiple battery cells 10.

[0085] The battery 100 may include multiple rows of battery cells 10, arranged along a third direction Z. Each row of battery cells 10 includes multiple battery cells 10 stacked along a first direction X. It should be noted that in other embodiments, the battery 100 may only include multiple battery cells 10 stacked along the first direction X, i.e., the battery 100 includes only one row of multiple battery cells 10 arranged along the first direction X. Each row of battery cells 10 may include one or more battery modules. The multiple rows of battery cells 10 may share a first thermal management component 20 and a second thermal management component 30.

[0086] Each battery cell 10 can be a secondary battery 100 or a primary battery 100; it can also be a lithium-sulfur battery 100, a sodium-ion battery 100, or a magnesium-ion battery 100, but is not limited thereto. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes. For example, such as... Figure 3 , Figure 4 As shown, the battery cell 10 is in the shape of a cuboid, with the first direction X being the thickness direction of the battery cell 10 and the third direction Z being the length direction of the battery cell 10.

[0087] Both the first thermal management component 20 and the second thermal management component 30 are used to regulate the temperature of the battery cell 10. Specifically, the first thermal management component 20 and the second thermal management component 30 can be used to lower the temperature of the battery cell 10 or to raise the temperature of the battery cell 10.

[0088] Please see Figure 3 , Figure 4 As shown, along the first direction X, the battery cell 10 has a first side surface 12, which is the surface with the largest area on the outer surface of the battery cell 10. The first thermal management component 20 abuts against the first side surface 12 of the two battery cells 10 on both sides along the first direction X. The first battery cell 11 abuts against the second thermal management component 30 from the first side surface 12 of the first thermal management component 20.

[0089] It should be noted that the battery cell 10 has a cuboid structure, and the first side surface 12 is the surface with the largest area on the outer surface of the battery cell 10. That is, the first side surface 12 is the outer surface of the battery cell 10 on one side in the thickness direction. In other words, the first thermal management component 20 is disposed between two adjacent battery cells 10 along the thickness direction of the battery cell 10, and the first thermal management component 20 abuts against the first side surface 12 of the battery cell 10 to realize heat exchange between the battery cell 10 and the first thermal management component 20. The second thermal management component 30 is disposed on the side of the first battery cell 11 away from the first thermal management component 20 along the thickness direction of the battery cell 10, and the second thermal management component 30 abuts against the first side surface 12 of the first battery cell 11 away from the first thermal management component 20 to realize heat exchange between the first battery cell 11 and the second thermal management component 30.

[0090] Along the first direction X, the thickness of the first thermal management component 20 is the dimension of the first thermal management component 20 along the first direction X, which is the distance between two opposite surfaces of the first thermal management component 20 along the first direction X. Figure 3 , Figure 4 H11. Along the first direction X, the thickness of the at least one first thermal management component 20 located between two adjacent battery cells 10 is the maximum dimension along the first direction X, considering all the first thermal management components 20 located between two adjacent battery cells 10 as a whole. The thickness of the at least one first thermal management component 20 disposed between two adjacent battery cells 10 is defined as H1.

[0091] The first direction X is the thickness direction of the first thermal management component 20.

[0092] One or more first thermal management components 20 can be provided between two adjacent battery cells 10. In embodiments where multiple first thermal management components 20 are provided between two adjacent battery cells 10, the two adjacent first thermal management components 20 can be surface-mounted, or they can be connected as a single unit through adhesive bonding, welding, or other methods. The battery cell 10 and its adjacent first thermal management component 20 can be connected; for example, the first thermal management component 20 can be adhesively bonded to the surface of the casing of the adjacent battery cell 10, or welded to the casing of the adjacent battery cell 10. The first thermal management component 20 can also be bonded to the surface (first side 12) of the adjacent battery cell 10, or a thermally conductive pad, thermally conductive adhesive, or other thermally conductive component can be provided between the first thermal management component 20 and the surface (first side 12) of the adjacent battery cell 10.

[0093] In an embodiment where a first thermal management component 20 is disposed between two adjacent battery cells 10, the thickness of the first thermal management component 20 along the first direction X is the thickness of the at least one first thermal management component 20 between the two adjacent battery cells 10. In an embodiment where multiple first thermal management components 20 are disposed between two adjacent battery cells 10, the distance between the surfaces of two first thermal management components 20 located at the ends of the row with the largest number stacked along the first direction X, which are facing away from each other, is the thickness of the at least one first thermal management component 20 between the two adjacent battery cells 10. The first direction X is perpendicular to the second direction Y. For example, five first thermal management components 20 are disposed between two adjacent battery cells 10, and the five first thermal management components 20 are divided into a first row and a second row arranged side by side along the second direction Y. The first row includes two first thermal management components 20 stacked along the first direction X, and the second row includes three first thermal management components 20 stacked along the first direction X. Then, the thickness of the at least one first thermal management component 20 between the two adjacent battery cells 10 is the distance between the surfaces of two first thermal management components 20 located at the ends of the second row along the first direction X, which are facing away from each other. In an embodiment where a plurality of first thermal management components 20 are stacked along a first direction X between two adjacent battery cells 10 and the surfaces of two adjacent first thermal management components 20 are directly attached, the thickness H1 of at least one first thermal management component 20 between two adjacent battery cells 10 is the sum of the thicknesses H11 of the plurality of first thermal management components 20. Figure 5 (as shown in the image).

[0094] Along the first direction X, the thickness of the second thermal management component 30 is the dimension of the second thermal management component 30 along the first direction X, which is the distance between two opposite surfaces of the second thermal management component 30 along the first direction X. Figure 3 , Figure 4 H21. Along the first direction X, the thickness of at least one second thermal management component 30 located on the side of the first battery cell 11 opposite to the first thermal management component 20 is the maximum dimension along the first direction X, considering all the second thermal management components 30 located on the side of the first battery cell 11 opposite to the first thermal management component 20 as a whole. The thickness of the at least one second thermal management component 30 disposed on the side of the first battery cell 11 opposite to the first thermal management component 20 is defined as H2. The first direction X is also the thickness direction of the second thermal management component 30.

[0095] At least one second thermal management component 30 may be provided on the side of a first battery cell 11 facing away from the first thermal management component 20, or at least one second thermal management component 30 may be provided on the side of two first battery cells 11 facing away from the first thermal management component 20. One or more second thermal management components 30 may be provided on the side of a first battery cell 11 facing away from the first thermal management component 20. In embodiments where multiple second thermal management components 30 are provided on the side of a first battery cell 11 facing away from the first thermal management component 20, adjacent second thermal management components 30 may be in surface contact, or adjacent second thermal management components 30 may be connected as a whole structure by means of adhesive bonding, welding, etc. The first battery cell 11 and its adjacent second thermal management component 30 may be connected, for example, the second thermal management component 30 may be adhesively bonded to the surface of the casing of the first battery cell 11, or the second thermal management component 30 may be welded to the casing of the first battery cell 11. The second thermal management component 30 may also contact the surface of the casing of the first battery cell 11, or a heat-insulating component such as a heat-insulating pad may be provided between the second thermal management component 30 and the surface of the casing of the first battery cell 11.

[0096] In an embodiment where at least one second thermal management component 30 is provided on the side of each of the two first battery cells 11 facing away from the first thermal management component 20, the number of second thermal management components 30 on the side of the two first battery cells 11 facing away from the first thermal management component 20 may be the same or different.

[0097] In an embodiment where a second thermal management component 30 is disposed on the side of the first battery cell 11 away from the first thermal management component 20, the thickness of the second thermal management component 30 along the first direction X is the thickness of the at least one second thermal management component 30 on the side of the first battery cell 11 away from the first thermal management component 20. In an embodiment where multiple second thermal management components 30 are disposed on the side of the first battery cell 11 away from the first thermal management component 20, the distance between the surfaces of two second thermal management components 30 located at opposite ends of the row with the largest number stacked along the first direction X is the thickness of the at least one second thermal management component 30 on the side of the first battery cell 11 away from the first thermal management component 20. For example, five second thermal management components 30 are disposed on the side of the first battery cell 11 away from the first thermal management component 20. These five second thermal management components 30 are arranged in a third and fourth row along a second direction Y. The third row includes two second thermal management components 30 stacked along a first direction X, and the fourth row includes three second thermal management components 30 stacked along a first direction X. The thickness of at least one second thermal management component 30 on the side of the first battery cell 11 away from the first thermal management component 20 is the distance between the surfaces of two second thermal management components 30 located at opposite ends along the first direction X in the fourth row. In an embodiment where multiple second thermal management components 30 stacked along the first direction X are disposed on the side of the first battery cell 11 away from the first thermal management component 20, and the surfaces of adjacent second thermal management components 30 are directly attached, the thickness H2 of at least one second thermal management component 30 on the side of the first battery cell 11 away from the first thermal management component 20 is the sum of the thicknesses H21 of the multiple second thermal management components 30. Figure 5 (as shown in the image).

[0098] In an embodiment where the battery 100 includes two battery cells 10, the two battery cells 10 are stacked along a first direction X, and the two battery cells 10 are two first battery cells 11. At least one first thermal management component 20 is disposed between the two first battery cells 11, and at least one thermal management component is disposed on the side of the first battery cell 11 facing away from the first thermal management component 20.

[0099] When the first battery cell 11 expands in the direction away from the first thermal management component 20, at least one second thermal management component 30 disposed on the side of the first battery cell 11 away from the first thermal management component 20 can be compressed along the first direction X to absorb the expansion of the first battery cell 11 in the direction away from the first thermal management component 20. Since the second thermal management component 30 is disposed on only one side along the first direction X, while the first thermal management component 20 is disposed on both sides along the first direction X, when the battery cell 10 expands, the amount by which the second thermal management component 30 absorbs the expansion of the battery cell 10 and is compressed is less than the amount by which the first thermal management component 20 absorbs the expansion of the battery cell 10 and is compressed.

[0100] Therefore, the thickness of the at least one second thermal management component 30 disposed on the side of the first battery cell 11 away from the first thermal management component 20, when viewed as a whole, is less than the thickness of the at least one first thermal management component 20 disposed between two adjacent battery cells 10, when viewed as a whole. This allows the amount of compression of the at least one second thermal management component 30 disposed on the side of the first battery cell 11 away from the first thermal management component 20 along the first direction X to match the amount of expansion of the first battery cell 11 in the direction away from the first thermal management component 20. This satisfies the expansion requirement of the first battery cell 11 in the direction away from the first thermal management component 20 and also reduces the space occupied by the second thermal management component 30 in the first direction X, which is beneficial to improving the energy density of the battery 100.

[0101] Furthermore, since the first thermal management component 20 needs to absorb the expansion of the battery cells 10 on both sides of it along the first direction X, the second thermal management component 30 is only provided for the expansion of the first battery cell 11 on one side along the first direction X. The thickness of the at least one second thermal management component 30 disposed on the side of the first battery cell 11 away from the first thermal management component 20 as a whole is smaller than the thickness of the at least one first thermal management component 20 disposed between two adjacent battery cells 10 as a whole. When the first thermal management component 20 is compressed to its limit along the first direction X, the second thermal management component 30 is also compressed to its limit along the first direction X, or the second thermal management component 30 is compressed to its limit along the first direction X. The space that can be compressed in the X direction is very small. This means that after the first thermal management component 20 is compressed to its limit in the first direction X, the first battery cell 11 cannot continue to expand in the direction away from the first thermal management component 20, or the expansion amount of the first battery cell 11 in the direction away from the first thermal management component 20 will be very small. This is beneficial to make the expansion amount of the first battery cell 11 and the battery cell 10 located between the two first battery cells 11 in the first direction X tend to be consistent. This reduces the risk that the first battery cell 11 will expand more in the first direction X due to the larger amount of compression of the second thermal management component 30 in the first direction X, which would cause the casing of the first battery cell 11 to be damaged due to expansion.

[0102] like Figures 6-9 As shown, in some embodiments, the battery 100 further includes two fixing portions 40 along the first direction X, the two fixing portions 40 being located on both sides of the plurality of battery cells 10, the at least one first thermal management component 20 abutting between two adjacent battery cells 10, and the at least one second thermal management component 30 abutting between the fixing portion 40 and the first battery cell 11.

[0103] Along the first direction X, two fixing portions 40 are arranged at a distance from each other, defining a receiving space between the two fixing portions 40. A first space for accommodating the at least one second thermal management component 30 is defined between one fixing portion 40 and a first battery cell 11. The surface of the at least one second thermal management component 30 (considering the at least one second thermal management component 30 located on the side of the first battery cell 11 facing away from the first thermal management component 20 as a whole) facing the first battery cell 11 abuts against the first battery cell 11, and the surface of the at least one second thermal management component 30 facing the fixing portion 40 abuts against the fixing portion 40. The second thermal management components 30 can be connected, for example, by bonding a second thermal management component 30 to the surface of an adjacent second thermal management component 30, or by welding a fixing portion 40 to the surface of an adjacent second thermal management component 30. The fixing portion 40 can also contact the surface of an adjacent second thermal management component 30, or a thermally conductive component such as a thermally conductive pad can be provided between the fixing portion 40 and the adjacent second thermal management component 30.

[0104] The fixing part 40 is fixed in position. When the battery cell 10 expands, the first battery cell 11 and the fixing part 40 interact, thereby compressing the second thermal management component 30 in the first direction X. The two adjacent batteries 100 interact unidirectionally, thereby compressing the first thermal management component 20 in the first direction X.

[0105] During the process of the battery cell 10 expanding along the first direction X and the first thermal management component 20 and the second thermal management component 30 being compressed along the first direction X, the fixing part 40 will not undergo visible deformation along the first direction X.

[0106] The battery 100 also includes two fixing parts 40, which are located on both sides of the plurality of battery cells 10 along the first direction X. The at least one first thermal management component 20 abuts against two adjacent battery cells 10, and the at least one second thermal management component 30 abuts against the fixing part 40 and the first battery cell 10. The fixing part 40 can limit the overall structure formed by all battery cells 10, the first thermal management component 20 and the second thermal management component 30, which is conducive to the stable installation of battery cells 10, the first thermal management component 20 and the second thermal management component 30, so as to maintain the stability of the relative positional relationship of battery cells 10, the first thermal management component 20 and the second thermal management component 30.

[0107] There are various ways to form the fixing part 40. In some embodiments, such as... Figure 4 As shown, the battery 100 also includes a housing 50, in which the plurality of battery cells 10, the at least one first thermal management component 20 and the at least one second thermal management component 30 are housed; the housing 50 includes two first sidewalls 51 arranged opposite to each other along a first direction X, and the first sidewalls 51 form a fixing portion 40.

[0108] The housing 50 provides space for the battery cells 10, the first thermal management component 20, and the second thermal management component 30. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 10 is housed in the housing 50; of course, the battery 100 can also be formed by first connecting multiple battery cells 10 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole, which is housed in the housing 50.

[0109] The housing 50 can adopt various structures. In some embodiments, the housing 50 may include a first portion 52 and a second portion 53, which overlap each other, and together define a receiving space for accommodating the battery cell 10. The second portion 53 may be a hollow structure with one end open to form a receiving cavity for accommodating the battery cell 10, the first thermal management component 20, and the second thermal management component 30. The first portion 52 may be a plate-like structure, which overlaps the open side of the second portion 53 so that the first portion 52 and the second portion 53 together define the receiving space. Alternatively, the first portion 52 and the second portion 53 may both be hollow structures with one side open to form a receiving cavity for accommodating the battery cell 10, the first thermal management component 20, and the second thermal management component 30, with the open side of the first portion 52 overlapping the open side of the second portion 53. Of course, the housing 50 formed by the first portion 52 and the second portion 53 can be of various shapes, such as a cylinder, a cuboid, etc.

[0110] The two first sidewalls 51 can be two opposite sidewalls of the portion of the housing 50 with an opening along the first direction X. Each sidewall of the portion of the housing 50 with an opening surrounds the outer periphery of the bottom wall 54 of that portion and is connected to the bottom wall 54 at one end, and the other end of each sidewall forms the opening of that portion of the housing 50.

[0111] Since the first side wall 51 of the housing 50 forms the fixing part 40, it is not necessary to set up a separate structure to form the fixing part 40, which helps to simplify the structure of the battery 100 and reduce the weight of the battery 100.

[0112] like Figure 7 As shown, in some other embodiments, the battery 100 also includes a housing 50, in which the plurality of battery cells 10, the at least one first thermal management component 20 and the at least one second thermal management component 30 are housed; the battery 100 also includes a partition beam 60, which is installed in the housing 50 and forms a fixing portion 40.

[0113] The partition beam 60 can divide the internal space of the housing 50 into multiple sub-spaces, each sub-space accommodating one or more battery modules. There can be one or more partition beams 60. In embodiments with multiple partition beams 60, both fixing parts 40 can also be formed by partition beams 60.

[0114] The partition beam 60 can be connected to the bottom wall 54 of the housing 50, or to the side wall of the housing 50, or simultaneously to both the bottom wall 54 and the side wall of the housing 50. The partition beam 60 can be detachably installed inside the housing 50, for example, by bolts, screws, etc. Alternatively, the partition beam 60 can be fixedly installed inside the housing 50, for example, by welding.

[0115] A partition beam 60 is installed inside the housing 50. The partition beam 60 forms a fixing part 40. The expansion force of each battery cell 10 when it expands is indirectly applied to the partition beam 60, reducing the damage to the housing 50 caused by the expansion force of the battery cell 10 when it expands.

[0116] Since the battery 100 includes two fixing parts 40, such as Figure 8 As shown, in some embodiments, one of the two fixing parts 40 may be a partition beam 60, and the other of the two fixing parts 40 may be the first sidewall 51 of the box body 50. Figure 9 As shown, in some embodiments, the battery 100 includes two fixing portions 40 formed by two partition beams 60, and includes two fixing portions 40 separately formed by a first sidewall 51 and a partition beam 60.

[0117] like Figures 6-9 As shown, in some embodiments, the battery 100 further includes a barrier 70, which abuts against the at least one second thermal management component 30 and the fixing portion 40 along the first direction X, and the thermal resistance of the barrier 70 is greater than the thermal resistance of the second thermal management component 30.

[0118] The barrier 70 can be clamped by the fixing part 40 and the second thermal management component 30 adjacent to the fixing part 40, with the surfaces of the barrier 70 and the fixing part 40 in contact, and the surfaces of the barrier 70 and the second thermal management component 30 in contact. The barrier 70 can also be connected to the fixing part 40 and / or the second thermal management component 30, for example, by adhesive bonding or welding.

[0119] Thermal resistance is a comprehensive parameter reflecting the ability to prevent heat transfer. A lower thermal resistance indicates weaker heat transfer capacity, and vice versa. When the barrier 70 abuts against the at least one second thermal management component 30, the barrier 70 can suppress heat transfer between the second thermal management component 30 and the fixing part 40. The heat transfer capacity between the second management component and the first battery cell 11 is better than the heat transfer capacity between the second thermal management component 30 and the fixing part 40. The barrier 70 can be plastic, a heat-insulating coating, etc. The barrier 70 can also be a plate structure, a finned structure, etc., and this application does not limit its application to these aspects.

[0120] The barrier 70 abuts against at least one second thermal management component 30 and the fixing part 40, and the thermal resistance of the barrier 70 is greater than that of the second thermal management component. The barrier 70 can effectively prevent heat transfer between the second thermal management component 30 and the blocking part, so that the second thermal management component 30 is difficult to exchange heat with the fixing part 40, thereby enabling the second thermal management component 30 to exchange heat efficiently with the first battery cell 11, thereby regulating the temperature of the first battery cell 11.

[0121] like Figure 3 , Figure 3 ,and Figures 6-9 As shown, in some embodiments, a first thermal management component 20 is disposed between two adjacent battery cells 10; and / or, a second thermal management component 30 is disposed on the side of the first battery cell 11 opposite to the first thermal management component 20 along the first direction X.

[0122] Alternatively, a first thermal management component 20 may be disposed between two adjacent battery cells 10, and multiple second thermal management components 30 may be disposed on the side of the first battery cell 11 facing away from the first thermal management component 20 along the first direction X. Or, a second thermal management component 30 may be disposed on the side of the first battery cell 11 facing away from the first thermal management component 20 along the first direction X, and multiple first thermal management components 20 may be disposed between two adjacent battery cells 10. Alternatively, a first thermal management component 20 may be disposed between two adjacent battery cells 10, and a second thermal management component 30 may be disposed on the side of the first battery cell 11 facing away from the first thermal management component 20 along the first direction X.

[0123] If a first thermal management component 20 is provided between two adjacent battery cells 10, the temperature of the battery cell 10 can be regulated using the minimum number of first thermal management components 20. This simplifies the structure of the battery 100, reduces its volume, and saves on its cost. It also reduces the space occupied by all the first thermal management components 20, which helps to improve the energy density of the battery 100. If a second thermal management component 30 is provided on the side of the first battery cell 11 opposite to the first thermal management component 20 along the first direction X, the temperature of the battery cell 10 can be regulated using the minimum number of second thermal management components 30. This simplifies the structure of the battery 100, reduces its volume, and saves on its cost. It also reduces the space occupied by all the second thermal management components 30, which helps to improve the energy density of the battery 100.

[0124] In some embodiments, along the first direction X, the thickness of the second thermal management component 30 is less than the thickness of the first thermal management component 20. That is, H21 < H11 in the figure.

[0125] The thickness of the second thermal management component 30 along the first direction X is less than the thickness of the first thermal management component 20 along the first direction X, which can reduce the space occupied by the second thermal management component 30 in the first direction X, and is beneficial to improving the energy density of the battery 100.

[0126] In other embodiments, the thickness of the first thermal management component 20 along the first direction X may also be equal to the thickness of the second thermal management component 30. In this embodiment, the number of first thermal management components 20 between two adjacent battery cells 10 should be greater than the number of second thermal management components 30 on the side of the first battery cell 11 away from the first thermal management component 20 along the first direction X, so that the thickness of at least one first thermal management component 20 between two adjacent battery cells 10 is greater than the thickness of at least one second thermal management component 30 on the side of the first battery cell 11 away from the first thermal management component 20 along the first direction X.

[0127] In some embodiments, a first flow channel 21 for accommodating heat exchange medium is formed inside the first thermal management component 20.

[0128] The first thermal management component 20 may be a plate-like structure with a first flow channel 21 internally formed to accommodate a heat exchange medium. The heat exchange medium within the first flow channel 21 may be water, air, a mixture of water and ethylene glycol, a refrigerant, a phase change material, etc., and the heat exchange medium may be circulating. In other embodiments, the heat exchange medium within the first flow channel 21 may also be a solid, such as paraffin wax. The heat exchange function can be achieved through the phase change of the heat exchange medium. For example, when paraffin wax changes from solid to liquid, it can absorb heat to achieve the effect of cooling the battery cell 10. The first thermal management component 20 may also be referred to as a water-cooled plate, liquid-cooled plate, heat exchange plate, temperature regulating plate, etc.

[0129] The first thermal management component 20 has a first flow channel 21 inside, which accommodates the heat exchange medium. The heat exchange medium is contained within the first flow channel 21, enabling the first thermal management component 20 to regulate the temperature of the battery cell 10. The first flow channel 21 also provides space for the first thermal management component 20 to be compressed along the first direction X, so that the first thermal management component 20 can absorb the expansion of the battery cell 10 through compression, thereby meeting the expansion requirements of the battery cell 10.

[0130] In some embodiments, a plurality of first flow channels 21 are formed inside the first thermal management component 20. The plurality of first flow channels 21 are arranged side by side along a second direction Y, which is perpendicular to the first direction X.

[0131] The second direction Y is the width direction of the first thermal management component 20.

[0132] Each first flow channel 21 extends along a third direction Z, the direction of extension of the first flow channel 21 being the flow direction of the heat exchange medium within the first flow channel 21, and the third direction Z being the length direction of the first thermal management component 20. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other.

[0133] The first thermal management component 20 has multiple first flow channels 21 arranged side by side along the second direction Y, which facilitates the control of the flow rate and flow volume of the heat exchange medium within the first thermal management component 20.

[0134] In other embodiments, the first thermal management component 20 may also have only one first flow channel 21 inside, making the structure of the first thermal management component 20 simpler.

[0135] In some embodiments, the first thermal management component 20 includes a first tube 22 and at least one first partition 23 disposed inside the first tube 22, wherein the at least one first partition 23 divides the internal space of the first tube 22 into a plurality of first flow channels 21.

[0136] The first partition 23 extends along a third direction Z to divide the internal space of the first tube 22 into a plurality of first flow channels 21 extending along a third direction Z. The number of first partitions 23 can be one or more. In embodiments where the number of first partitions 23 is multiple, the multiple first partitions 23 are arranged at intervals along a second direction Y. Along the second direction Y, the spacing between two adjacent first partitions 23 can be the same or different. Along the second direction Y, the distance between the first partitions 23 gradually decreases from the middle to both sides. In embodiments where the number of first partitions 23 is multiple, along the second direction Y, the first bend ( Figure 10 As shown in the diagram (described later), the maximum distance between the second bend and the nearest first partition 23 is less than the distance between any two adjacent first partitions 23. Figure 10 As shown in the figure (described below), the maximum distance between the nearest first separator 23 and the first separator 23 is less than the distance between any two adjacent first separators 23.

[0137] The first partition 23 is connected inside the first tube body 22. The first partition 23 and the first tube body 22 can be separate components, connected by welding, bonding, or other methods. The first partition 23 and the first tube body 22 can be fixedly connected, such as by welding or bonding, to improve the stability of each first flow channel 21. Alternatively, the first partition 23 and the first tube body 22 can be detachably connected, with a slot (not shown in the figure) inside the first tube body 22 for the first partition 23 to engage, allowing for a detachable connection.

[0138] In other embodiments, the first tube 22 and the first separator 23 may also be integrally formed.

[0139] By providing at least one first partition 23 within the internal space of the first tube 22, the internal space of the first tube 22 is divided into multiple first flow channels 21 for accommodating the heat exchange medium, thereby facilitating the control of the flow rate and volume of the heat exchange medium within the first thermal management component 20.

[0140] like Figure 10 , Figure 11 As shown, in some embodiments, along the first direction X, the first tube body 22 includes a first tube wall 221 and a second tube wall 222 disposed opposite to each other, and a first separator 23 is obliquely disposed between the first tube wall 221 and the second tube wall 222 and connected to the first tube wall 221 and the second tube wall 222.

[0141] The first pipe wall 221 and the second pipe wall 222 are both straight walls. The first pipe wall 221 and the second pipe wall 222 are arranged opposite to each other along the first direction X, that is, the first pipe wall 221 and the second pipe wall 222 are spaced apart and facing each other along the first direction X. The first direction X is the thickness direction of the first pipe wall 221 and the second pipe wall 222. In other words, the first pipe wall 221 and the second pipe wall 222 are spaced apart and parallel to each other.

[0142] The first tube body 22 also includes a first bent wall 223 and a second bent wall 224 arranged opposite to each other along the second direction Y. One end of the first tube wall 221 along the second direction Y and one end of the second tube wall 222 along the second direction Y are respectively connected to the two ends of the first bent wall 223 along the first direction X. The other end of the first tube wall 221 along the second direction Y and the other end of the second tube wall 222 along the second direction Y are respectively connected to the two ends of the second bent wall 224 along the first direction X. The first tube wall 221, the first bent wall 223, the second tube wall 222, and the second bent wall 224 are sequentially connected end to end to form the internal space of the first tube body 22. A first flow channel 21 is formed between the first bent wall 223 and the first partition 23, and a first flow channel 21 is formed between the second bent wall 224 and the first partition 23.

[0143] The first bent wall 223 and the second bent wall 224 are both curved structures connected between the first pipe wall 221 and the second pipe wall 222. The bending direction of the first bent wall 223 and the second bent wall 224 can be various, such as arc shape, V shape, etc.

[0144] In other embodiments, the first bent wall 223 and the second bent wall 224 may be replaced by two straight walls.

[0145] The first partition 23 is inclinedly disposed between the first pipe wall 221 and the second pipe wall 222, and is connected to the first pipe wall 221 and the second pipe wall 222, that is, the first pipe wall 221 and the second pipe wall 222 are not perpendicularly connected to the first partition 23.

[0146] By tilting the first separator 23 and connecting it between the first tube wall 221 and the second tube wall 222, it is easier for the first thermal management component 20 to be compressed and deformed along the first direction X to absorb the expansion of the battery cell 10, thereby reducing the difficulty of compressing the first thermal management component 20 along the first direction X.

[0147] In some embodiments, the first separator 23 has a first surface 231 and a second surface 232 opposite to each other in its thickness direction. Along the first direction X, the first pipe wall 221 has a third surface 2211 facing the first flow channel 21, and the second pipe wall 222 has a fourth surface 2221 facing the first flow channel 21. The first surface 231 is set at an acute angle to the third surface 2211 and at an obtuse angle to the fourth surface 2221, and the second surface 232 is set at an obtuse angle to the third surface 2211 and at an acute angle to the fourth surface 2221, respectively. The first surface 231 and the third surface 2211 are connected by a first chamfered surface 225, and / or the second surface 232 and the fourth surface 2221 are connected by a second chamfered surface 226.

[0148] The first pipe wall 221 has a third surface 2211 facing the first flow channel 21, and the second pipe wall 222 has a fourth surface 2221 facing the first flow channel 21. That is, the surface of the first pipe wall 221 facing the second pipe wall 222 in the first direction X is the third surface 2211, and the surface of the second pipe wall 222 facing the first pipe wall 221 in the first direction X is the fourth surface 2221.

[0149] The first surface 231 is set at an acute angle to the third surface 2211 and at an obtuse angle to the fourth surface 2221, respectively. That is, the first surface 231 of the first separator 23 on one side of its thickness direction is set at an acute angle to the first pipe wall 221, and the first surface 231 of the first separator 23 on one side of its thickness direction is set at an obtuse angle to the second pipe wall 222. Similarly, the second surface 232 is set at an obtuse angle to the third surface 2211 and at an acute angle to the fourth surface 2221, respectively. That is, the second surface 232 of the first separator 23 on the other side of its thickness direction is set at an obtuse angle to the first pipe wall 221, and the second surface 232 of the first separator 23 on the other side of its thickness direction is set at an acute angle to the second pipe wall 222.

[0150] The first surface 231 and the third surface 2211 are connected by a first chamfered surface 225, that is, a chamfer is formed between the first surface 231 on one side of the first partition member 23 in the thickness direction and the third surface 2211 of the first pipe wall 221 which is set at an acute angle. Similarly, the second surface 232 and the fourth surface 2221 are connected by a second chamfered surface 226, that is, a chamfer is formed between the second surface 232 on the other side of the first partition member 23 in the thickness direction and the fourth surface 2221 of the second pipe wall 222 which is set at an acute angle.

[0151] For example, both the first chamfered surface 225 and the second chamfered surface 226 are arc surfaces. Of course, in other embodiments, the first chamfered surface 225 and the second chamfered surface 226 may also be planes.

[0152] The first surface 231 of the first separator 23 is set at an acute angle to the third surface 2211 of the first pipe wall 221 and is connected through the first chamfered surface 225, and / or the second surface 232 of the first separator 23 is set at an acute angle to the fourth surface 2221 of the second pipe wall 222 and is connected through the second chamfered surface 226. This can increase the thickness of the part of the first separator 23 connected to the first pipe wall 221 and the part of the first separator 23 connected to the second pipe wall 222 in the second direction Y. This can improve the connection stability and reliability between the first separator 23 and the pipe wall on the one hand, and alleviate the problem of cracks appearing between the first separator 23 and the pipe wall on the other hand.

[0153] Please refer to Figure 3 , Figure 4 In some embodiments, the battery 100 further includes a first busbar 80 and a second busbar 90. The first busbar 80 has a first busbar chamber 81 formed inside, and the second busbar 90 has a second busbar chamber 91 formed inside. The first busbar 80 and the second busbar 90 are respectively connected to the two ends of the first thermal management component 20 along the third direction Z. Each first flow channel 21 is connected to the first busbar chamber 81 and the second flow channel 91. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other. Among the plurality of first flow channels 21, the two first flow channels 21 located at the ends along the second direction Y are respectively the first end flow channel and the second end flow channel. The cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is smaller than the cross-sectional area of ​​the other first flow channels 21.

[0154] Both the first manifold 80 and the second manifold 90 extend along the second direction Y. The first manifold chamber 81 extends along the second direction Y, and the second manifold chamber 91 also extends along the second direction Y. The first manifold 80 has a first medium inlet 82 for the heat exchange medium to flow into the first manifold chamber 81, and the second manifold 90 has a first medium outlet 92 for the heat exchange medium to flow out of the second manifold chamber 91. The heat exchange medium enters the first manifold chamber 81 from the first medium inlet 82, flows along the second direction Y to each of the first flow channels 21, and then flows along the third direction Z within the first flow channels 21 to the second manifold chamber 91. The heat exchange medium in each of the first flow channels 21 converges in the second manifold chamber 91 and is discharged from the first medium outlet 92. The first flow channels 21 are connected in parallel.

[0155] In embodiments where the battery 100 includes multiple first thermal management components 20, the multiple first thermal management components 20 can be connected in series or in parallel. If the first medium inlets 82 of the first busbars 80 connected to the multiple first thermal management components 20 are interconnected, and the first medium outlets 92 of the second busbars 90 connected to the multiple first thermal management components 20 are interconnected, then the multiple first thermal management components 20 are connected in parallel; if the first medium inlet 82 of the first busbar 80 on one of the multiple first thermal management components 20 is sequentially connected to the first medium outlet 92 of the second busbar 90 on another first thermal management component 20, then the multiple first thermal management components 20 are connected in series.

[0156] It should be noted that in the structure in which multiple first thermal management components 20 are connected in series, the first busbar 80 on one first thermal management component 20 can be directly connected to the second busbar 90 of another first thermal management component 20, or they can be connected through other components, such as connecting pipes, to realize the series structure of multiple first thermal management components 20.

[0157] In a structure in which multiple first thermal management components 20 are connected in parallel, the first busbars 80 on each first thermal management component 20 can be directly connected, and the second busbars 90 on each first thermal management component 20 can be directly connected, or they can be connected through other components, such as connecting pipes, to realize the parallel structure of multiple first thermal management components 20.

[0158] The smaller the cross-sectional area of ​​the flow channel, the greater the resistance (flow resistance) encountered by the heat exchange medium. The cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is smaller than the cross-sectional area of ​​the other first flow channels 21. That is, during the flow of the heat exchange medium from the first manifold 81 to each of the first flow channels 21, the flow resistance of at least one of the first end flow channels and the second end flow channel is greater than the flow resistance of the other first flow channels 21, and the heat exchange medium in the first manifold 81 is more likely to flow to the other first flow channels 21.

[0159] It is possible that the cross-sectional area of ​​one of the first end flow channels and the second end flow channel is smaller than the cross-sectional area of ​​the other first flow channels 21, or that the cross-sectional areas of both the first end flow channels and the second end flow channels are smaller than the cross-sectional areas of the other first flow channels 21.

[0160] At least one of the two first flow channels 21 (first end flow channel and second end flow channel) located at the end along the second direction Y has a smaller cross-sectional area than the other first flow channels 21. This results in a larger flow resistance at least one first flow channel 21 located at the end. The heat exchange medium flowing out of one of the first manifold 80 and the second manifold 90 can be distributed to the first flow channel 21 located between the first end flow channel and the second end flow channel, thereby facilitating the distribution of sufficient heat exchange medium to each first flow channel 21 and improving the uniformity of heat exchange.

[0161] In some embodiments, the cross-sectional area of ​​at least one of the first end channel and the second end channel is the smallest among the plurality of first channels 21.

[0162] The cross-sectional area of ​​one of the first end flow channels and the second end flow channel can be the smallest among all the first flow channels 21, or the cross-sectional areas of both the first end flow channel and the second end flow channel can be the smallest among all the first flow channels 21.

[0163] If the cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is the smallest among the plurality of first flow channels 21, then the flow resistance of the one with the smallest cross-sectional area is the largest. This makes it easier for the heat exchange medium to flow into the first flow channel 21 located between the first end flow channel and the second end flow channel, thereby facilitating the distribution of sufficient heat exchange medium to each first flow channel 21 and improving the uniformity of heat exchange. Since the expansion amount of the edge region along the second direction Y of the battery cell 10 is less than the expansion amount of the middle region along the second direction Y, when the dimensions of each first flow channel 21 along the first direction X are the same, the smaller the cross-sectional area of ​​the first flow channel 21, the smaller the dimension of the first flow channel 21 along the second direction Y, making it more difficult for the corresponding region of the first flow channel 21 to be compressed along the first direction X, and the compressible amount is smaller. The cross-sectional areas of the first end flow channel and the second end flow channel are the smallest among the multiple first flow channels 21. When the battery cell 10 expands, the compressible amount of the first thermal management component 20 in the corresponding region of the first end flow channel and the second end flow channel along the first direction X is less than that in the region between the first end flow channel and the second end flow channel, so as to match the expansion amount of different regions of the battery cell 10 along the second direction Y, so as to meet the expansion amount requirements of different regions of the battery cell 10.

[0164] In some embodiments, the second thermal management component 30 has a second flow channel 31 formed inside to accommodate the heat exchange medium, and the size of the second flow channel 31 is smaller than the size of the first flow channel 21 along the first direction X.

[0165] The second thermal management component 30 can be a plate-like structure with a second flow channel 31 formed inside to accommodate a heat exchange medium. The heat exchange medium in the second flow channel 31 can be water, air, a mixture of water and ethylene glycol, a refrigerant, a phase change material, etc., and the heat exchange medium can be circulated. In other embodiments, the heat exchange medium in the second flow channel 31 can also be a solid, such as paraffin wax. The heat exchange function can be achieved through the phase change of the heat exchange medium. For example, when paraffin wax changes from solid to liquid, it can absorb heat to achieve the effect of cooling the battery cell 10. The second thermal management component 30 can also be called a water-cooled plate, liquid-cooled plate, heat exchange plate, temperature regulating plate, etc.

[0166] In other embodiments, the dimensions of the first flow channel 21 and the second flow channel 31 along the first direction X may be the same, or the dimension of the first flow channel 21 may be larger than the dimension of the second flow channel 31. Therefore, in some embodiments, a second flow channel 31 is formed inside the second thermal management component to accommodate the heat exchange medium. The dimension of the second flow channel 31 in any direction is independent of the first flow channel 21. The heat exchange medium is accommodated within the second flow channel 31, enabling the second thermal management component 30 to perform temperature regulation of the first battery cell 11. The arrangement of the second flow channel 31 also provides space for the second thermal management component 30 to compress along the first direction X, allowing the second thermal management component 30 to absorb the expansion of the first battery cell 11 in the direction away from the first thermal management component 20 through compression, thereby satisfying the expansion requirement of the first battery cell 11 in the direction away from the first thermal management component 20.

[0167] In some embodiments, a plurality of second flow channels 31 are formed inside the second thermal management component 30. The plurality of second flow channels 31 are arranged side by side along a second direction Y, which is perpendicular to the first direction X.

[0168] The second direction Y is the width direction of the second thermal management component 30. Each second flow channel 31 extends along a third direction Z, the extension direction of the second flow channel 31 being the flow direction of the heat exchange medium within the second flow channel 31, and the third direction Z being the length direction of the second thermal management component 30. The third direction Z, the second direction Y, and the first direction X are all perpendicular to each other.

[0169] The second thermal management component 30 has multiple second flow channels 31 arranged side by side along the second direction Y, which facilitates the control of the flow rate and flow volume of the heat exchange medium within the second thermal management component 30.

[0170] In other embodiments, the second thermal management component 30 may also have only one second flow channel 31 inside, making the structure of the second thermal management component 30 simpler.

[0171] like Figure 12 , Figure 13 As shown, in some embodiments, the second thermal management component 30 includes a second tube body 32 and at least one second partition 33 disposed inside the second tube body 32, wherein the at least one second partition 33 divides the internal space of the second tube body 32 into a plurality of second flow channels 31.

[0172] The second partition 33 extends along a third direction Z to divide the internal space of the second tube 32 into a plurality of second flow channels 31 extending along a third direction Z. The number of second partitions 33 can be one or more. In embodiments where there are multiple second partitions 33, the multiple second partitions 33 are arranged at intervals along a second direction Y. Along the second direction Y, the spacing between two adjacent second partitions 33 can be the same or different. Along the second direction Y, the distance between the second partitions 33 gradually decreases from the middle to both sides. In embodiments where there are multiple second partitions 33, along the second direction Y, the third bend ( Figure 11 As shown in the diagram (described later), the maximum distance between the fourth bend (and the nearest second partition 33) and the second partition 33 is less than the distance between any two adjacent second partitions 33. Figure 11 As shown in the figure (described below), the maximum distance between the nearest second partition 33 and the partition 33 is less than the distance between any two adjacent second partitions 33.

[0173] The second partition 33 is connected inside the second tube body 32. The second partition 33 and the second tube body 32 can be separate components, then connected within the second tube body 32 by welding, bonding, or other methods. Alternatively, the second partition 33 and the second tube body 32 can be fixedly connected, such as by welding or bonding, to improve the stability of each second flow channel 31. The second partition 33 and the second tube body 32 can also be detachably connected, with a slot inside the second tube body 32 for the second partition 33 to engage, thus achieving a detachable connection.

[0174] In other embodiments, the second tube 32 and the second separator 33 may also be integrally formed.

[0175] By providing at least one second partition 33 within the internal space of the second tube 32, the internal space of the second tube 32 is divided into multiple second flow channels 31 for accommodating the heat exchange medium, thereby facilitating the control of the flow rate and volume of the heat exchange medium within the second thermal management component 30.

[0176] Please continue to refer to Figure 12 , Figure 13 In some embodiments, along the first direction X, the second tube body 32 includes a third tube wall 321 and a fourth tube wall 322 disposed opposite to each other, and the second partition 33 is inclinedly disposed between the third tube wall 321 and the fourth tube wall 322 and connected to the third tube wall 321 and the fourth tube wall 322.

[0177] Both the third pipe wall 321 and the fourth pipe wall 322 are straight walls. The third pipe wall 321 and the fourth pipe wall 322 are arranged opposite each other along the first direction X, that is, the third pipe wall 321 and the fourth pipe wall 322 are spaced apart and facing each other along the first direction X. The first direction X is the thickness direction of the third pipe wall 321 and the fourth pipe wall 322. In other words, the third pipe wall 321 and the four pipe walls are spaced apart and parallel to each other.

[0178] The third tube also includes a third bent wall 323 and a fourth bent wall 324 arranged opposite to each other along the second direction Y. One end of the third tube wall 321 along the second direction Y and one end of the fourth tube wall 322 along the second direction Y are respectively connected to the two ends of the third bent wall 323 along the first direction X. The other ends of the third tube wall 321 along the second direction Y and the other ends of the fourth tube wall 322 along the second direction Y are respectively connected to the two ends of the fourth bent wall 324 along the first direction X. The third tube wall 321, the third bent wall 323, the fourth tube wall 322, and the fourth bent wall 324 are sequentially connected end to end to form the internal space of the second tube 32. A second flow channel 31 is formed between the third bent wall 323 and the second partition 33, and a second flow channel 31 is formed between the fourth bent wall 324 and the second partition 33.

[0179] Both the third bent wall 323 and the fourth bent wall 324 are curved structures connected between the third pipe wall 321 and the fourth pipe wall 322. The bending direction of the third bent wall 323 and the fourth bent wall 324 can be various, such as arc shape, V shape, etc.

[0180] In other embodiments, the third bent wall 323 and the fourth bent wall 324 may be replaced by two straight walls.

[0181] The second partition 33 is inclinedly disposed between the third pipe wall 321 and the fourth pipe wall 322, and is connected to the third pipe wall 321 and the fourth pipe wall 322, that is, the third pipe wall 321 and the fourth pipe wall 322 are not perpendicularly connected to the second partition 33.

[0182] By tilting the second separator 33 and connecting it between the third tube wall 321 and the fourth tube wall 322, it is easier for the second thermal management component 30 to be compressed and deformed along the first direction X to absorb the expansion of the first battery cell 11, thereby reducing the difficulty of compressing the second thermal management component 30 along the first direction X.

[0183] In some embodiments, the second separator 33 has a fifth surface 331 and a sixth surface 332 opposite to each other in its thickness direction. Along the first direction X, the third pipe wall 321 has a seventh surface 3211 facing the second flow channel 31, and the fourth pipe wall 322 has an eighth surface 3221 facing the second flow channel 31. The fifth surface 331 is set at an acute angle and an obtuse angle with the seventh surface 3211 and the eighth surface 3221, respectively. The sixth surface 332 is set at an obtuse angle and an acute angle with the seventh surface 3211 and the eighth surface 3221, respectively. The fifth surface 331 and the seventh surface 3211 are connected by a third chamfered surface 235. And / or, the sixth surface 332 and the eighth surface 3221 are connected by a fourth chamfered surface 236.

[0184] The third pipe wall 321 has a seventh surface 3211 facing the second flow channel 31, and the fourth pipe wall 322 has an eighth surface 3221 facing the second flow channel 31. That is, the surface of the third pipe wall 321 facing the fourth pipe wall 322 in the first direction X is the seventh surface 3211, and the surface of the fourth pipe wall 322 facing the third pipe wall 321 in the first direction X is the eighth surface 3221.

[0185] The fifth surface 331 is set at an acute angle to the seventh surface 3211 and at an obtuse angle to the eighth surface 3221, respectively. That is, the fifth surface 331 of the second partition 33 on one side of its thickness direction is set at an acute angle to the third pipe wall 321, and the fifth surface 331 of the second partition 33 on one side of its thickness direction is set at an obtuse angle to the fourth pipe wall 322. Similarly, the sixth surface 332 is set at an obtuse angle to the seventh surface 3211 and at an acute angle to the eighth surface 3221, respectively. That is, the sixth surface 332 of the second partition 33 on the other side of its thickness direction is set at an obtuse angle to the third pipe wall 321, and the sixth surface 332 of the second partition 33 on the other side of its thickness direction is set at an acute angle to the fourth pipe wall 322.

[0186] The fifth surface 331 and the seventh surface 3211 are connected by a third chamfered surface 235, meaning that a chamfer is formed between the fifth surface 331 of the second partition 33 on one side of its thickness direction and the seventh surface 3211 of the third pipe wall 321, which is set at an acute angle. Similarly, the sixth surface 332 and the eighth surface 3221 are connected by a fourth chamfered surface 236, meaning that a chamfer is formed between the sixth surface 332 of the second partition 33 on the other side of its thickness direction and the eighth surface 3221 of the fourth pipe wall 322, which is set at an acute angle.

[0187] For example, both the third chamfered surface 235 and the fourth chamfered surface 236 are arc surfaces. Of course, in other embodiments, the third chamfered surface 235 and the fourth chamfered surface 236 may also be planes.

[0188] The fifth surface 331 of the second partition 33 is set at an acute angle to the seventh surface 3211 of the third pipe wall 321 and is connected through the third chamfered surface 235, and / or the sixth surface 332 of the second partition 33 is set at an acute angle to the eighth surface 3221 of the fourth pipe wall 322 and is connected through the fourth chamfered surface 236. This can increase the thickness of the part of the second partition 33 connected to the third pipe wall 321 and the part of the second partition 33 connected to the fourth pipe wall 322 in the second direction Y. This can improve the connection stability and reliability between the second partition 33 and the pipe wall on the one hand, and alleviate the problem of cracks between the second partition 33 and the pipe wall on the other hand.

[0189] Please continue to refer to Figure 3 , Figure 4 In some embodiments, the battery 100 further includes a third busbar 110 and a fourth busbar 120. The third busbar 110 has a third busbar chamber 1101 formed inside, and the fourth busbar 120 has a fourth busbar chamber 1201 formed inside. The third busbar 110 and the fourth busbar 120 are respectively connected to the two ends of the second thermal management component 30 along the third direction Z. Each second flow channel 31 is connected to the third busbar chamber 1101 and the fourth busbar chamber 1201. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other. Among the plurality of second flow channels 31, the two second flow channels 31 located at the ends along the second direction Y are respectively the third end flow channel and the fourth end flow channel. The cross-sectional area of ​​at least one of the third end flow channel and the fourth end flow channel is smaller than the cross-sectional area of ​​the other second flow channels 31.

[0190] Both the third manifold 110 and the fourth manifold 120 extend along the second direction Y. The third manifold chamber 1101 and the fourth manifold chamber 1201 extend along the second direction Y. The third manifold 110 has a second medium inlet 1102 for the heat exchange medium to flow into the third manifold chamber 1101. The fourth manifold 120 has a second medium outlet 1202 for the heat exchange medium to flow out of the fourth manifold chamber 1201. The heat exchange medium enters the third manifold chamber 1101 from the second medium inlet 1102. Within the third manifold chamber 1101, the heat exchange medium flows along the second direction Y to each of the second flow channels 31, and then flows along the third direction Z within the second flow channels 31 to the fourth manifold chamber 1201. The heat exchange medium in each of the second flow channels converges in the fourth manifold chamber 1201 and is discharged from the second medium outlet 1202. The second flow channels 31 are connected in parallel.

[0191] In embodiments where the battery 100 includes multiple second thermal management components 30, the multiple second thermal management components 30 can be connected in series or in parallel. If the second medium inlets 1102 of the third busbars 110 connected to the multiple second thermal management components 30 are interconnected, and the second medium outlets 1202 of the fourth busbars 120 connected to the multiple second thermal management components 30 are interconnected, then the multiple second thermal management components 30 are connected in parallel; if the second medium inlet 1102 of the third busbar 110 on one of the multiple second thermal management components 30 is sequentially connected to the second medium outlet 1202 of the fourth busbar 120 on another second thermal management component 30, then the multiple second thermal management components 30 are connected in series.

[0192] It should be noted that in the structure in which multiple second thermal management components 30 are connected in series, the third busbar 110 on one second thermal management component 30 can be directly connected to the third busbar 110 of another second thermal management component 30, or they can be connected through other components, such as connecting pipes, to realize the series structure of multiple second thermal management components 30.

[0193] In a structure in which multiple second thermal management components 30 are connected in parallel, the third busbars 110 on each second thermal management component 30 can be directly connected, and the fourth busbars 120 on each second thermal management component 30 can be directly connected, or they can be connected through other components, such as connecting pipes, to realize the parallel structure of multiple second thermal management components 30.

[0194] At least one of the third and fourth end channels has a smaller cross-sectional area than the other second channels 31. That is, during the flow of the heat exchange medium from the third manifold 1101 to each of the second channels 31, the flow resistance of at least one of the third and fourth end channels is greater than the flow resistance of the other second channels 31, and the heat exchange medium in the third manifold 1101 is more likely to flow to the other second channels 31.

[0195] It is possible that the cross-sectional area of ​​one of the third end flow channel and the fourth end flow channel is smaller than the cross-sectional area of ​​the other second flow channels 31, or that the cross-sectional areas of both the third end flow channel and the fourth end flow channel are smaller than the cross-sectional areas of the other second flow channels 31.

[0196] At least one of the two second flow channels 31 (the third end flow channel and the fourth end flow channel) located at the end along the second direction Y has a smaller cross-sectional area than the other second flow channels 31. This results in a larger flow resistance at least one second flow channel 31 located at the end. The heat exchange medium flowing out of one of the third manifold 110 and the fourth manifold 120 can be distributed to the second flow channel 31 located between the third end flow channel and the fourth end flow channel, thereby facilitating the distribution of sufficient heat exchange medium to each second flow channel 31 and improving the uniformity of heat exchange.

[0197] The first thermal management component 20 and the second thermal management component 30 can be independent structures, or they can form a series structure or a parallel structure. In embodiments where the battery 100 includes multiple first thermal management components 20 and multiple second thermal management components 30, the multiple first thermal management components 20 can form a first series structure, and the multiple second thermal management components 30 can form a second series structure, with the first series structure and the second series structure connected in series or in parallel; or the multiple first thermal management components 20 can form a first parallel structure, and the multiple second thermal management components 30 can form a second parallel structure, with the first parallel structure and the second parallel structure connected in series or in parallel; or the multiple first thermal management components 20 can form a first series structure, and the multiple second thermal management components 30 can form a first parallel structure, with the first series structure and the first parallel structure connected in series or in parallel; or the multiple first thermal management components 20 can form a second parallel structure, and the multiple second thermal management components 30 can form a second series structure, with the second parallel structure and the second series structure connected in series or in parallel.

[0198] In some embodiments, the cross-sectional area of ​​at least one of the third end channel and the fourth end channel is the smallest among the plurality of second channels 31.

[0199] The cross-sectional area of ​​either the third end channel or the fourth end channel can be the smallest among all the second channels 31, or the cross-sectional areas of both the third end channel and the fourth end channel can be the smallest among all the second channels 31.

[0200] If the cross-sectional area of ​​at least one of the third and fourth end channels is the smallest among the multiple second channels 31, then the one with the smallest cross-sectional area has the largest flow resistance. This makes it easier for the heat exchange medium to flow into the second channel 31 located between the third and fourth end channels, which is beneficial for distributing sufficient heat exchange medium to each second channel 31, thereby improving the uniformity of heat exchange. Since the expansion amount of the edge region along the second direction Y of the first battery cell 11 is less than the expansion amount of the middle region along the second direction Y, when the dimensions of each second flow channel 31 along the first direction X are the same, the smaller the cross-sectional area of ​​the second flow channel 31, the smaller the dimension of the second flow channel 31 along the second direction Y, making it more difficult for the corresponding region of the second flow channel 31 to be compressed along the first direction X, and the compressible amount is smaller. The cross-sectional areas of the third end flow channel and the fourth end flow channel are the smallest among the multiple second flow channels 31. When the first battery cell 11 expands, the compressible amount of the second thermal management component 30 in the corresponding region of the third end flow channel and the fourth end flow channel along the first direction X is less than that in the region between the third end flow channel and the fourth end flow channel, so as to match the expansion amount of different regions of the first battery cell 11 along the second direction Y, so as to meet the expansion amount requirements of different regions of the first battery cell 11.

[0201] Secondly, embodiments of this application also provide an electrical device, including the battery 100 provided in any of the above embodiments.

[0202] This application provides a battery 100, which includes a plurality of battery cells 10 stacked along a first direction X. A first thermal management component 20 is disposed between two adjacent battery cells 10. Along the first direction X, two opposing surfaces of the first thermal management component 20 abut against the largest first side surface 12 of the two battery cells 10 located on either side of it. The plurality of battery cells 10 includes two first battery cells 11 located at both ends of the first direction X. A second thermal management component 30 is disposed on the side of each first battery cell 11 facing away from the first thermal management component 20. Along the first direction X, the second thermal management component 30 abuts against the largest first side surface 12 of the first battery cell 11 facing away from the first thermal management component 20. The surface of the second thermal management component 30 facing away from the first battery cell 11 abuts against a fixing part 40. Along the first direction X, the thickness of the second thermal management component 30 is less than the thickness of the first thermal management component 20. The first thermal management component 20 has a plurality of first flow channels 21 arranged along the second direction Y, and the second thermal management component 30 has a pair of second flow channels 31 arranged along the second direction Y.

[0203] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: Multiple battery cells are stacked along a first direction. The multiple battery cells include two first battery cells located at both ends along the first direction. A first thermal management component is disposed between two adjacent battery cells. A second thermal management component is disposed on the side of the first battery cell away from the first thermal management component along the first direction. Wherein, along the first direction, the thickness of the second thermal management component is less than the thickness of the first thermal management component; The battery also includes two fixing parts. Along the first direction, the two fixing parts are located on both sides of the plurality of battery cells. The first thermal management component abuts against two adjacent battery cells, and the second thermal management component abuts against the fixing part and the first battery cell. The first thermal management component has a first flow channel for accommodating heat exchange medium inside, and the second thermal management component has a second flow channel for accommodating heat exchange medium inside. Along the first direction, the size of the second flow channel is smaller than the size of the first flow channel. The battery also includes a barrier member, which abuts against the second thermal management component and the fixing part along the first direction, and the thermal resistance of the barrier member is greater than the thermal resistance of the second thermal management component.

2. The battery according to claim 1, characterized in that, The battery also includes a housing, in which the plurality of battery cells, the first thermal management component, and the second thermal management component are housed; The housing includes two first sidewalls arranged opposite each other along the first direction, and the first sidewalls form the fixing part.

3. The battery according to claim 1, characterized in that, The battery also includes a housing, in which the plurality of battery cells, the first thermal management component, and the second thermal management component are housed; The battery also includes a separator beam, which is installed inside the housing and forms the fixing part.

4. The battery according to claim 1, characterized in that, The first thermal management component has multiple first flow channels formed inside, and the multiple first flow channels are arranged side by side along a second direction, which is perpendicular to the first direction.

5. The battery according to claim 4, characterized in that, The first thermal management component includes a first tube body and at least one first partition disposed inside the first tube body, the at least one first partition dividing the internal space of the first tube body into a plurality of first flow channels.

6. The battery according to claim 5, characterized in that, Along the first direction, the first pipe body includes a first pipe wall and a second pipe wall disposed opposite to each other, and the first separator is inclinedly disposed between the first pipe wall and the second pipe wall and connected to the first pipe wall and the second pipe wall.

7. The battery according to claim 6, characterized in that, The first separator has opposing first and second surfaces in its thickness direction, and along the first direction, the first tube wall has a third surface facing the first flow channel, and the second tube wall has a fourth surface facing the first flow channel. The first surface is set at an acute angle and an obtuse angle with the third surface and the fourth surface, respectively; the second surface is set at an obtuse angle and an acute angle with the third surface and the fourth surface, respectively. Wherein, the first surface and the third surface are connected by a first chamfered surface; and / or, the second surface and the fourth surface are connected by a second chamfered surface.

8. The battery according to claim 4, characterized in that, The battery further includes a first busbar and a second busbar. The first busbar has a first busbar chamber inside, and the second busbar has a second busbar chamber inside. The first busbar and the second busbar are respectively connected to the two ends of the first thermal management component along a third direction. Each first flow channel is connected to the first busbar chamber and each first flow channel is connected to the second busbar chamber. The third direction, the second direction and the first direction are perpendicular to each other. Two of the first flow channels located at the ends along the second direction are respectively a first end flow channel and a second end flow channel, and the cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is smaller than the cross-sectional area of ​​the other first flow channels.

9. The battery according to claim 8, characterized in that, The cross-sectional area of ​​at least one of the first end flow channel and the second end flow channel is the smallest among the plurality of first flow channels.

10. The battery according to claim 1, characterized in that, The second thermal management component has multiple second flow channels formed inside, and the multiple second flow channels are arranged side by side along a second direction, which is perpendicular to the first direction.

11. The battery according to claim 10, characterized in that, The second thermal management component includes a second tube body and at least one second partition disposed inside the second tube body, the at least one second partition dividing the internal space of the second tube body into a plurality of second flow channels.

12. The battery according to claim 11, characterized in that, Along the first direction, the second pipe body includes a third pipe wall and a fourth pipe wall disposed opposite to each other, and the second separator is inclinedly disposed between the third pipe wall and the fourth pipe wall and connected to the third pipe wall and the fourth pipe wall.

13. The battery according to claim 12, characterized in that, The second separator has opposing fifth and sixth surfaces in its thickness direction, and along the first direction, the third pipe wall has a seventh surface facing the second flow channel, and the fourth pipe wall has an eighth surface facing the second flow channel. The fifth surface is set at an acute angle and an obtuse angle with the seventh surface and the eighth surface, respectively; the sixth surface is set at an obtuse angle and an acute angle with the seventh surface and the eighth surface, respectively. The fifth surface is connected to the seventh surface via a third chamfered surface; and / or the sixth surface is connected to the eighth surface via a fourth chamfered surface.

14. The battery according to claim 10, characterized in that, The battery further includes a third busbar and a fourth busbar. The third busbar has a third busbar chamber inside, and the fourth busbar has a fourth busbar chamber inside. The third busbar and the fourth busbar are respectively connected to the two ends of the second thermal management component along a third direction. Each second flow channel is connected to the third busbar chamber and each second flow channel is connected to the fourth busbar chamber. The third direction, the second direction, and the first direction are perpendicular to each other. Two of the second flow channels located at the ends along the second direction are a third end flow channel and a fourth end flow channel, respectively, and the cross-sectional area of ​​at least one of the third end flow channel and the fourth end flow channel is smaller than the cross-sectional area of ​​the other second flow channels.

15. The battery according to claim 14, characterized in that, The cross-sectional area of ​​at least one of the third end channel and the fourth end channel is the smallest among the plurality of second channels.

16. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-15.

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