Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a battery monomer and a heat exchange piece, each single battery is provided with a first end surface and a peripheral surface, the first end surface is provided with a pole, and the peripheral surface is connected to the first end surface; the heat exchange piece is connected with the peripheral surface in a heat exchange manner and is provided with at least two heat exchange areas; the normal direction of the first end face is defined as the first direction, and the at least two heat exchange areas are arranged in the first direction; the heat exchange powers of at least two heat exchange areas are different, in any two heat exchange areas with different heat exchange powers, the heat exchange area close to the pole is defined as a first heat exchange area, the heat exchange area far away from the pole is defined as a second heat exchange area, and the heat exchange power of the first heat exchange area is larger than that of the second heat exchange area; the number of the heat exchange areas is at least three, and the at least three heat exchange areas are arranged in the first direction. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

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

[0002] Battery devices generate significant heat during operation, causing the temperature of individual battery cells to rise. Excessive heat negatively impacts the lifespan and performance of individual battery cells, affecting the reliability of the entire battery system. Therefore, enabling individual battery cells to operate within a suitable temperature range has become a pressing issue in battery technology. Utility Model Content

[0003] The main objective of this application is to provide a battery device and an electrical appliance designed to improve the reliability of the battery device.

[0004] To achieve the above objectives, the battery device proposed in this application includes:

[0005] A battery cell has a first end face and a peripheral face, the first end face having an electrode post, and the peripheral face being connected to the first end face; and

[0006] A heat exchanger is provided in a heat exchange connection with the circumferential surface and has at least two heat exchange zones; the normal direction of the first end face is defined as the first direction, and the at least two heat exchange zones are arranged along the first direction;

[0007] Among them, there are at least two heat exchange zones with different heat exchange powers. In any two heat exchange zones with different heat exchange powers, the heat exchange zone closer to the pole is defined as the first heat exchange zone, and the heat exchange zone farther away from the pole is defined as the second heat exchange zone. The heat exchange power of the first heat exchange zone is greater than that of the second heat exchange zone.

[0008] The number of heat exchange zones is at least three, and the at least three heat exchange zones are arranged along the first direction.

[0009] The battery device of this application comprises a heat exchanger with at least two heat exchange zones, wherein the heat exchange power of at least two of these zones is set differently. In any two heat exchange zones with different heat exchange power, the heat exchange power of the zone closer to the electrode post is greater than that of the zone farther from the electrode post. This allows the heat exchanger to heat the area of ​​the battery cell's periphery near the electrode post through the zone with relatively higher heat exchange power, and to heat the area of ​​the battery cell's periphery farther from the electrode post through the zone with relatively lower heat exchange power. In actual operation, the heat generation power of the battery cell is also greater in the area closer to the electrode post than in the area farther from the electrode post. Therefore, it can be said that the heat exchanger can heat the area of ​​the battery cell with relatively higher heat generation power through the zone with relatively higher heat exchange power, and to heat the area of ​​the battery cell with relatively lower heat generation power through the zone with relatively lower heat exchange power. This allows the heat exchanger to perform targeted heat dissipation by using heat exchange zones with appropriate heat exchange power for different areas of the battery cell, based on the different heat generation power of different areas. This ensures that all areas of the battery cell can be effectively heated to a suitable temperature range for operation, reducing the possibility of localized overheating of the battery cell after heat exchange, which could affect the battery cell's lifespan and performance.

[0010] At the same time, when the heat exchanger heats each area of ​​the battery cell to a suitable temperature range, it also makes the temperature of each area of ​​the battery cell relatively uniform, reducing the possibility of large temperature differences in different areas of the battery cell, causing inconsistent aging rates in different areas, and affecting the service life and performance of the battery device.

[0011] In other words, the structural design of the battery device in this application can enable each region of the battery cell to operate normally and stably within a suitable temperature range, and can also achieve relatively uniform temperature in each region so that the battery cell is not affected by the temperature of different regions, thereby improving the reliability of the battery device.

[0012] In addition, by setting the number of heat exchange zones to at least three and arranging them along the first direction, the area of ​​each heat exchange zone can be set to be relatively small. This facilitates more refined heat exchange and cooling control of the corresponding areas on the periphery of the battery cell through at least three heat exchange zones on the heat exchange component, thereby further improving the targeting of heat exchange for different areas on the periphery of the battery cell.

[0013] In some embodiments, both the first heat exchange zone and the second heat exchange zone are provided with heat exchange channels.

[0014] Therefore, by designing and adjusting the factors affecting the heat exchange power in the heat exchange channel, the required heat exchange power of the first and second heat exchange zones can be obtained. This allows the heat exchange power of each heat exchange zone to be designed and adjusted to match the heat generation power of different areas of the battery cell. Consequently, effective heat exchange can be carried out according to the different heat generation power of the battery cell in different areas, thereby improving the heat exchange effect of the battery cell in different areas.

[0015] In some embodiments, the total heat exchange area of ​​all heat exchange channels in the first heat exchange zone is greater than the total heat exchange area of ​​all heat exchange channels in the second heat exchange zone.

[0016] This allows for a larger effective heat exchange area in the first heat exchange zone, enabling it to remove more heat from individual battery cells within the same timeframe, thus facilitating a greater heat exchange power in the first heat exchange zone compared to the second heat exchange zone.

[0017] In some embodiments, the total flow path length of all heat exchange channels in the first heat exchange zone is greater than the total flow path length of all heat exchange channels in the second heat exchange zone.

[0018] Therefore, the first heat exchange zone can achieve a greater heat exchange power compared to the second heat exchange zone. Furthermore, only the design adjustment of the flow channel length of a single heat exchange channel within the first and second heat exchange zones, or the design adjustment of the number of heat exchange channels per unit area in the first and second heat exchange zones, is required. This simplifies the design adjustment and improves the ease of manufacturing the heat exchange components.

[0019] In some embodiments, at least two heat exchange channels arranged side by side are provided in both the first heat exchange zone and the second heat exchange zone;

[0020] Within a unit area, the number of heat exchange channels in the first heat exchange zone is greater than the number of heat exchange channels in the second heat exchange zone.

[0021] Therefore, by making the heat exchange channels in the first heat exchange zone more densely packed, the total length of all heat exchange channels in the first heat exchange zone can be increased simply by adjusting the number of heat exchange channels. Adjusting the number of heat exchange channels is relatively simple, which in turn improves the ease of processing and manufacturing the heat exchange components.

[0022] In some embodiments, the heat exchange channels in the first heat exchange zone and the second heat exchange zone are arranged side by side along the first direction, and the spacing between two adjacent heat exchange channels is increased in the direction from the first end face to the side of the battery cell facing away from the first end face.

[0023] This allows the heat exchange power of the first and second heat exchange zones to decrease from top to bottom, corresponding to the decrease in the heat generation power of the battery cell from top to bottom. This, in turn, helps to improve the adaptability of the heat exchange components to the heat exchange effect of each area of ​​the battery cell.

[0024] In some embodiments, at least two heat exchange channels arranged side by side are provided in both the first heat exchange zone and the second heat exchange zone;

[0025] The length of at least a portion of the heat exchange channels in the first heat exchange zone is greater than the length of the heat exchange channels in the second heat exchange zone.

[0026] This allows for a larger total flow path length across all heat exchange channels within the first heat exchange zone. Furthermore, designing and adjusting the flow path length is relatively simple, which in turn improves the ease of manufacturing heat exchange components.

[0027] In some embodiments, the cross-sectional area of ​​at least a portion of the heat exchange channels in the first heat exchange zone is larger than the cross-sectional area of ​​the heat exchange channels in the second heat exchange zone.

[0028] Therefore, the first heat exchange zone can have a greater heat exchange power than the second heat exchange zone. Moreover, when shaping the heat exchange channels, only the cross-sectional size of the heat exchange channels in the first and second heat exchange zones needs to be designed and adjusted, making the design adjustment simple and thus improving the convenience of processing and manufacturing heat exchange components.

[0029] In some embodiments, the heat exchange channels in the first heat exchange zone are connected to the heat exchange channels in the second heat exchange zone.

[0030] Therefore, a single heat exchange medium circulation system can be used to supply and discharge liquid to the heat exchange components, which helps to simplify the number of parts.

[0031] In some embodiments, the heat exchange channels in the first heat exchange zone are connected in series with the heat exchange channels in the second heat exchange zone; the heat exchange element is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet is connected to the heat exchange channels in the first heat exchange zone, and the first liquid outlet is connected to the heat exchange channels in the second heat exchange zone.

[0032] This allows the heat exchange medium to first pass through the heat exchange channel in the first heat exchange zone and then through the heat exchange channel in the second heat exchange zone. This enables the heat exchange medium to cool the area of ​​the battery cell near the electrode when the temperature is relatively low, thereby improving the heat exchange and cooling efficiency of the battery cell.

[0033] In some embodiments, along a first direction, at least two heat exchange channels are provided in both the first heat exchange zone and the second heat exchange zone; the at least two heat exchange channels in the first heat exchange zone are connected in series, the at least two heat exchange channels in the second heat exchange zone are connected in series, and the two heat exchange channels closest to the first heat exchange zone and the second heat exchange zone are connected in series; the first liquid inlet is connected to the heat exchange channel in the first heat exchange zone that is furthest from the second heat exchange zone, and the first liquid outlet is connected to the heat exchange channel in the second heat exchange zone that is furthest from the first heat exchange zone.

[0034] Therefore, whether in the first heat exchange zone or the second heat exchange zone, the heat exchange medium can perform heat exchange and cooling on the relatively high-temperature areas of the battery cell near the electrode at a relatively low temperature, which is conducive to further improving the heat exchange and cooling efficiency of the battery cell.

[0035] In some embodiments, the heat exchange channels in the first heat exchange zone are isolated from the heat exchange channels in the second heat exchange zone; the heat exchange element is provided with a first liquid inlet, a first liquid outlet, a second liquid inlet, and a second liquid outlet; the first liquid inlet and the first liquid outlet are connected to the heat exchange channels in the first heat exchange zone; the second liquid inlet and the second liquid outlet are connected to the heat exchange channels in the second heat exchange zone.

[0036] Therefore, by using two sets of heat exchange medium circulation systems, liquid can be supplied and discharged to the heat exchange channels in the first heat exchange zone and the second heat exchange zone respectively. The control parameters of the heat exchange medium circulation systems in the first and second heat exchange zones can be designed and adjusted to achieve different heat exchange powers in the first and second heat exchange zones.

[0037] In some embodiments, the heat exchange medium in the heat exchange channel located in the first heat exchange zone is of a different type than the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

[0038] Therefore, it is possible to achieve different heat exchange powers in the first and second heat exchange zones. Moreover, the design and adjustment of the type of heat exchange medium are relatively simple, and no adjustments to the structural design of the heat exchange components themselves are required, which further facilitates the realization of different heat exchange powers in the first and second heat exchange zones.

[0039] In some embodiments, the flow rate of the heat exchange medium in the heat exchange channel located in the first heat exchange zone is greater than the flow rate of the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

[0040] Therefore, the first and second heat exchange zones can have different heat exchange powers. Moreover, the control of the volumetric flow rate of the power pump is relatively simple, and no adjustments to the structural design of the heat exchange components themselves are required, which further facilitates the realization of different heat exchange powers in the first and second heat exchange zones.

[0041] In some embodiments, the flow velocity of the heat exchange medium in the heat exchange channel located in the first heat exchange zone is greater than the flow velocity of the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

[0042] Therefore, the first and second heat exchange zones can have different heat exchange powers. Moreover, the control of the volumetric flow rate of the power pump is relatively simple, and no adjustments to the structural design of the heat exchange components themselves are required, which further facilitates the realization of different heat exchange powers in the first and second heat exchange zones.

[0043] In some embodiments, the total thermal resistance of the heat transfer path formed by the battery cell and the first heat exchange zone is less than the total thermal resistance of the heat transfer path formed by the battery cell and the second heat exchange zone.

[0044] Therefore, by adjusting the total thermal resistance of the heat transfer path formed by the battery cell and the first and second heat transfer zones differently, the heat transfer power of the first and second heat transfer zones can be different. This design adjustment is mainly concentrated on the outside of the heat transfer channel, which can improve the convenience of its design adjustment.

[0045] In some embodiments, the thermal conductivity of the material of the heat exchanger in the first heat exchange zone is greater than that of the material in the second heat exchange zone.

[0046] This allows for a lower thermal resistance in the first heat exchange zone, facilitating rapid heat conduction and dissipation of heat generated by the battery cells, thereby improving the heat exchange effect on areas with high heat generation power within the battery cells.

[0047] In some embodiments, the battery device further includes a thermal interface material layer disposed between the battery cell and the first heat exchange zone.

[0048] Therefore, a thermal interface material layer is provided between the battery cell and the first heat exchange zone, which can reduce the thermal resistance between the two and thus help improve the heat exchange power of the first heat exchange zone.

[0049] In some embodiments, the heat exchanger has a heat exchange wall surface opposite to the battery cell, and the thickness of the heat exchange wall surface of the first heat exchange zone is less than the thickness of the heat exchange wall surface of the second heat exchange zone.

[0050] Therefore, by setting the thickness of the heat exchange wall of the first heat exchange zone to be less than that of the heat exchange wall of the second heat exchange zone, the thermal resistance of the first heat exchange zone can also be lower, which facilitates the rapid conduction and heat dissipation of the heat generated by the battery cell in the first heat exchange zone, thereby improving the heat exchange effect on the area with high heat generation power in the battery cell.

[0051] In some embodiments, at least two heat exchange zones include a first heat exchange zone, and the heat exchange power of the first heat exchange zone is greater than the heat exchange power of the other heat exchange zones.

[0052] In the first direction, the coverage of the first heat exchange zone on the circumferential surface is defined as p, which satisfies the relationship: 0.3≤p≤0.6.

[0053] This allows the end heat exchange zone with greater heat exchange power to cover most of the area near the electrode on the periphery of the battery cell, thereby improving the heat exchange efficiency of the battery cell.

[0054] In some embodiments, the peripheral surface includes two opposing large surfaces and two opposing small surfaces, the area of ​​the large surfaces is larger than the area of ​​the small surfaces, and the heat exchanger is configured to be heat exchanged with the large surfaces.

[0055] Define the height of a single battery cell as H between the first end face and the side opposite to the first end face, and the thickness of the single battery cell in the arrangement direction of the two large faces as D, satisfying the relationship: 0 < D / H ≤ 0.5.

[0056] This improves the heat dissipation effect near the terminals of this type of battery cell.

[0057] In some embodiments, in the direction from the first end face to the side of the battery cell opposite to the battery cell, the heat exchange power of at least three heat exchange zones is set to decrease.

[0058] Therefore, the number of heat exchange zones is more diverse, and the heat exchange power of each heat exchange zone is reduced in the direction of the first end face pointing to the side of the battery cell away from the battery cell. This makes it more suitable for the heat generation power of the battery cell's periphery to decrease in the direction away from the electrode post, thereby improving the heat exchange and cooling effect of the heat exchange component on different areas of the battery cell.

[0059] In some embodiments, the battery cell has two terminals, both of which are located on the first end face.

[0060] Therefore, by setting the two terminals of a battery cell on the same side of the battery cell, it is convenient to arrange the terminals in a concentrated manner and to realize the electrical connection between adjacent battery cells. At the same time, it also makes the direction from the direction closer to the terminal to the direction farther away from the terminal a single direction, which makes it convenient to arrange at least two heat exchange zones with different heat exchange powers in a single direction.

[0061] On the other hand, the electrical equipment proposed in this application includes the battery device in any of the above embodiments. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0063] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application;

[0064] Figure 2 This is an exploded structural diagram of an embodiment of the battery device of this application;

[0065] Figure 3 This is an exploded structural diagram of a single battery cell according to an embodiment of this application;

[0066] Figure 4 This is a partial structural schematic diagram of the battery device of this application;

[0067] Figure 5 for Figure 4 A schematic diagram of the assembly structure of the battery cell and heat exchanger.

[0068] Figure 6 This is a schematic diagram of the structure of an embodiment of the heat exchanger of this application;

[0069] Figure 7 This is a schematic diagram of another embodiment of the heat exchanger of this application;

[0070] Figure 8 This is a schematic diagram of the structure of another embodiment of the heat exchanger of this application;

[0071] Figure 9 This is a schematic diagram of another embodiment of the heat exchanger of this application;

[0072] Figure 10 This is a schematic diagram of the structure of another embodiment of the heat exchanger of this application;

[0073] Figure 11 This is a schematic diagram of another embodiment of the heat exchanger of this application;

[0074] Figure 12 This is a schematic diagram of another embodiment of the battery device of this application;

[0075] Figure 13 This is a schematic diagram of the structure of another embodiment of the heat exchanger of this application;

[0076] Figure 14 This is a schematic diagram of the structure of another embodiment of the battery device of this application;

[0077] Figure 15This is a schematic diagram of another embodiment of the battery cell of this application.

[0078] Explanation of icon numbers:

[0079] 100. Battery assembly; 1. Battery box; 11. Box cover; 12. Box body; 1a. Receptacle; 20A. Battery cell assembly; 20. Battery cell; 21. End cap; 21a. Terminal post; 22. Housing; 23. Electrode assembly; 231. Tab; 24. First end face; 25. Peripheral surface; 251. Large surface; 253. Small surface; 30. Heat exchanger; 31. Heat exchange zone; 311. First heat exchange zone ; 312, Second heat exchange zone; 313, End heat exchange zone; 32, Heat exchange channel; 33, Heat exchange wall; 34, Main plate; 35, Current collector; 351, First liquid inlet; 352, First liquid outlet; 353, Second liquid inlet; 354, Second liquid outlet; 36, Sealing component; 40, Thermal interface material layer; 1000, Vehicle; 200, Controller; 300, Motor; X, First direction.

[0080] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0081] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0082] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0083] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0085] A battery device, or energy storage device, is widely used not only in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. A battery device may include a battery box and individual battery cells housed within the battery box. The battery box may include a box body and a cover that closes to the box body to enclose a cavity containing the individual battery cells. The individual battery cell is the smallest unit comprising a battery, typically including a battery casing and an electrode assembly housed within the casing. The electrode assembly is the component in the individual battery cell where the electrochemical reaction actually occurs, and may include a positive electrode, a negative electrode, and a separator located between them, formed by winding or stacking the positive electrode, negative electrode, and separator. Furthermore, at least two individual battery cells within the battery box may be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0086] Furthermore, since battery devices generate heat during operation, they are typically equipped with heat exchange mechanisms to cool the individual battery cells. However, in related technologies, the heat exchange mechanisms provide uniform heat exchange power across all areas when cooling the periphery of the battery cells. During actual operation, the heat generated by the terminal post at the top of the battery cell is continuous, resulting in greater heat generation in the upper region near the terminal post than in the lower region further away. In other words, the heat generation power in the upper region near the terminal post is greater than that in the lower region. Therefore, when the heat exchange mechanism uses uniform heat exchange power to simultaneously cool both the upper and lower regions of the battery cell with different heat generation powers, it is prone to ineffective cooling of the upper region. This leads to the upper region of the battery cell remaining at a high temperature after heat exchange, affecting the battery cell's lifespan and performance, and reducing the reliability of the battery device. At the same time, it will also cause a large temperature difference in the upper part of the battery cell because the temperature is higher than that in the lower part, resulting in inconsistent aging rates in different areas of the cell, which will affect the lifespan and performance of the battery cell and reduce the reliability of the battery device.

[0087] Therefore, based on the above considerations, in order to solve the problem of low reliability of battery devices in related technologies, this application proposes a novel battery device. This battery device innovatively configures the heat exchange component to include at least two heat exchange zones, and at least some of these zones have different heat exchange powers. This allows for targeted heat exchange with heat exchange zones of different powers based on the varying heat generation power of different areas of the battery cell, achieving effective heat exchange and cooling of different areas of the battery cell. This ensures that each area of ​​the battery cell can operate normally and stably within a suitable stable range, and reduces the potential temperature differences between different areas.

[0088] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Further, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0089] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0090] Please refer to Figure 1 , Figure 1This 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 device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 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 device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0091] In some embodiments of this application, the battery device 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.

[0092] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery case 1 and a battery cell assembly 20A; the battery case 1 is provided with a receiving cavity 1a, and the battery cell assembly 20A includes a plurality of battery cells 20, which are disposed within the battery case 1.

[0093] The battery cell assembly 20A may comprise three or more battery cells 20. These battery cells 20 may be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 20 are connected in series while others are in parallel. When the battery device 100 is in its normal installation and use state, the first direction X can be defined as the vertical direction, and the second and third directions can be two intersecting horizontal directions. In this case, the battery cells 20 in the battery cell assembly 20A may be arranged in a row along the second direction, or further, at least two rows may be arranged side-by-side along the third direction. Alternatively, the battery cells 20 in the battery cell assembly 20A may also be arranged in a row along the third direction, or further, at least two rows may be arranged side-by-side along the second direction. This application does not limit the arrangement direction of the battery cells 20 in the battery cell assembly 20A. Of course, the first direction X can also be other directions, and this application does not limit the specific direction types of the first direction X, the second direction, and the third direction. In addition, the battery cell 20 can be a prismatic battery, a pouch battery, or a cylindrical battery. This application does not limit the type of battery cell 20.

[0094] The battery case 1 can be used to form a receiving cavity 1a to provide a space for accommodating the battery cell 20. The battery case 1 can adopt various structures. In some embodiments, the battery case 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for accommodating the battery cell 20. In this case, the body 12 can provide accommodating support for the battery cell 20. In addition, both the cover 11 and the body 12 can be hollow structures with an opening on one side. In this case, the opening side of the cover 11 can cover the opening side of the body 12. Of course, the cover 11 can also be a plate structure and cover the opening side of the body 12. In addition, the battery case 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc. Furthermore, the cover 11 and the body 12 can be arranged along a first direction X.

[0095] In addition, the battery device 100 may include other structures, such as busbars, for electrical connection between multiple battery cells 20. Furthermore, each battery cell 20 may be a secondary or primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes.

[0096] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 As shown, the battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0097] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as terminals 21a can be provided on end cap 21. Terminals 21a can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0098] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0099] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the terminals 21a to form a current circuit.

[0100] Please refer to the reference. Figures 3 to 5 In one embodiment of this application, the battery cell 20 has a first end face 24 and a peripheral face 25. The first end face 24 is provided with a terminal post 21a, and the peripheral face 25 is connected to the first end face 24. The battery device 100 also includes a heat exchanger 30, which is heat exchanged with the peripheral face 25 and is provided with at least two heat exchange zones 31. The normal direction of the first end face 24 is defined as the first direction X, and at least two heat exchange zones 31 are arranged along the first direction X. At least two heat exchange zones 31 have different heat exchange powers, and the heat exchange power of the heat exchange zone 31 located near the terminal post 21a is greater than that of the heat exchange zone 31 located away from the terminal post 21a.

[0101] When the first direction X is vertical as described above, the first end face 24 of the battery cell 20 can be the top surface of the battery cell 20 for mounting the terminal post 21a; of course, in some embodiments, it can also be further provided with an explosion-proof valve, etc. In addition, when the battery cell 20 includes an end cap 21, a housing 22 and an electrode assembly 23 as described above, the first end face 24 can be the end cap 21 located on the battery cell 20.

[0102] The peripheral surface 25 of the battery cell 20 can be arranged circumferentially around the first end face 24. When the battery cell 20 is a prismatic battery, the peripheral surface 25 can be located within the casing 22 of the battery cell 20. In this case, the peripheral surface 25 can include two opposing large surfaces 251 and two opposing small surfaces 253, where the area of ​​the large surfaces 251 is larger than the area of ​​the small surfaces 253. When the battery cell 20 is a cylindrical battery, the peripheral surface 25 can be a torus. When the battery cell 20 is a pouch battery, the peripheral surface 25 can be a flat rectangle.

[0103] The heat exchanger 30 can be used to connect with the battery cell 20 for heat exchange, thereby cooling the battery cell 20. In some instances, where the ambient temperature is relatively low, the heat exchanger 30 can also be used to heat the battery cell 20. The heat exchange connection proposed in this application refers to the connection between the two components allowing for heat exchange, including direct contact and indirect exchange via air or other objects. Furthermore, the heat exchanger 30 can be a liquid-cooled plate or liquid-cooled pipe structure with a heat exchange channel 32, as described below, for heat exchange via a heat exchange medium such as water or oil. Alternatively, the heat exchanger 30 can be a phase change energy storage structure that uses the heat absorption and release of a phase change material for heat exchange; this application does not limit the structural type of the heat exchanger 30. In addition, the heat exchanger 30 can be connected to the large surface 251 of the peripheral surface 25 of the battery cell 20 for heat exchange; alternatively, it can be connected to the small surface 253 of the peripheral surface 25 for heat exchange.

[0104] The heat exchange zone 31 can be formed from different areas of the heat exchange component 30. The number of heat exchange zones 31 can be two, three, or more; this application does not limit the number of heat exchange zones 31. When the first direction X is vertical and the pole post 21a is upward, at least two heat exchange zones 31 can be arranged sequentially from top to bottom. Furthermore, at least two heat exchange zones 31 can be arranged as a single integral structure. The single integral structure proposed in this application refers to a structure prepared by a single integral molding process such as integral extrusion molding or integral die casting. Of course, at least two heat exchange zones 31 can also be arranged as separate structures. In this case, at least two heat exchange zones 31 can be connected and assembled by welding or bonding, or they can be directly spaced apart, or their opposing edges abut against each other. In addition, the area of ​​each heat exchange zone 31 can be the same, partially the same, or completely different.

[0105] Furthermore, the existence of at least two heat exchange zones 31 with different heat exchange powers means that the heat exchange powers of all heat exchange zones 31 can be set to be different. For example, the heat exchange powers of each heat exchange zone 31 can be set to decrease sequentially from top to bottom. Alternatively, only some heat exchange zones 31 can have different heat exchange powers. For example, the heat exchange power of the upper heat exchange zone 31 can be set to be greater than that of the middle and lower heat exchange zones 31, while the heat exchange power of the middle and lower heat exchange zones 31 can be set to be the same. In addition, the heat exchange power proposed in this application refers to the amount of heat exchanged per unit time. For example, when the heat exchanger 30 performs heat exchange and cooling on the battery cell 20, the heat exchange power is the amount of heat absorbed by the battery cell 20 per unit time. The heat exchange power can be calculated using the formula... The calculation shows that P represents the heat transfer power of heat exchange zone 31, and c represents the isobaric specific heat capacity of the heat transfer medium in heat exchange zone 31. ΔT represents the mass flow rate of the heat exchange medium, and ΔT represents the temperature difference between the inlet and outlet positions of the heat exchange medium in heat exchange zone 31.

[0106] In any two heat exchange zones 31 with different heat exchange powers, the heat exchange power of the heat exchange zone 31 located closer to the pole 21a is greater than the heat exchange power of the heat exchange zone 31 located farther from the pole 21a. This means that among several heat exchange zones 31 with different heat exchange powers, the heat exchange power of the upper heat exchange zone 31 is greater than the heat exchange power of the lower heat exchange zone 31.

[0107] Furthermore, when the heat exchanger 30 adopts a liquid-cooled structure such as a liquid-cooled plate or liquid-cooled pipe with a heat exchange channel 32, the factors affecting the heat exchange power include, but are not limited to, the following: first, the total heat exchange area of ​​the heat exchange channel 32; second, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchanger 30; and third, the type, flow rate, or velocity of the heat exchange medium in the heat exchange channel 32. In order to achieve different heat exchange powers in at least two heat exchange zones 31, at least one of these three factors can be adjusted in the design. For example, the total heat exchange area of ​​the heat exchange channel 32 in different heat exchange zones 31 can be set differently, or, based on this, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchanger 30 in different heat exchange zones 31 can be set differently to further differentiate the heat exchange power of different heat exchange zones 31. When the heat exchanger 30 adopts a phase change energy storage structure, the factors affecting the heat exchange power include, but are not limited to, the following: first, the phase change material; and second, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchanger 30. In order to achieve different heat exchange powers in different heat exchange zones 31, at least one of these two factors can be adjusted in the design. For example, the phase change materials in different heat exchange zones 31 can be set differently, or, based on this, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchanger 30 in different heat exchange zones 31 can be set differently to further differentiate the heat exchange power of different heat exchange zones 31. Therefore, to achieve different heat exchange powers in different heat exchange zones 31, at least one of the many factors affecting the heat exchange power can be set differently.

[0108] The battery device 100 of this application provides a heat exchanger 30 with at least two heat exchange zones 31, wherein at least some of the heat exchange zones 31 have different heat exchange powers, and the heat exchange power of the heat exchange zone 31 located closer to the electrode 21a is greater than that of the heat exchange zone 31 located farther from the electrode 21a. This allows the heat exchanger 30 to exchange heat on the area of ​​the peripheral surface 25 of the battery cell 20 near the electrode 21a through the heat exchange zone 31 with relatively higher heat exchange power, and to exchange heat on the area of ​​the peripheral surface 25 of the battery cell 20 farther from the electrode 21a through the heat exchange zone 31 with relatively lower heat exchange power. In actual operation, the heat generation power of the area of ​​the battery cell 20 closer to the electrode 21a is greater than that of the area farther from the electrode 21a. Therefore, it can be said that the heat exchanger 30 can exchange heat in areas of the battery cell 20 with relatively higher heat exchange power through the heat exchange zone 31 with relatively higher heat exchange power, and in areas of the battery cell 20 with relatively lower heat exchange power through the heat exchange zone 31 with relatively lower heat exchange power. This allows the heat exchanger 30 to use heat exchange zones 31 with appropriate heat exchange power for different areas of the battery cell 20, enabling each area of ​​the battery cell 20 to be effectively heated to a suitable temperature range for operation. This reduces the possibility of localized overheating of the battery cell 20 after heat exchange, which could affect its lifespan and performance. Simultaneously, when the heat exchanger 30 heats each area of ​​the battery cell 20 to a suitable temperature range, it also ensures that the temperature of each area of ​​the battery cell 20 is relatively uniform, reducing the possibility of large temperature differences between different areas of the battery cell 20, which could lead to inconsistent aging rates and affect the lifespan and performance of the battery device 100. That is, the structural design of the battery device 100 in this application can enable each region of the battery cell 20 to operate normally and stably within a suitable temperature range, and can also make the temperature of each region relatively uniform so that the battery cell 20 is not affected by the temperature of different regions, thereby improving the reliability of the battery device 100.

[0109] Please refer to the reference. Figure 5 and Figure 6 In one embodiment of this application, in any two heat exchange zones 31 with different heat exchange powers, the heat exchange zone 31 located near the pole post 21a is defined as the first heat exchange zone 311, and the heat exchange zone 31 located away from the pole post 21a is defined as the second heat exchange zone 312. Both the first heat exchange zone 311 and the second heat exchange zone 312 are provided with heat exchange channels 32.

[0110] In the first direction X, the first heat exchange zone 311 is positioned closer to the pole 21a than the second heat exchange zone 312, and the heat exchange power of the first heat exchange zone 311 is greater than that of the second heat exchange zone 312. The heat exchange element 30 may include only two heat exchange zones 31, one of which is the first heat exchange zone 311 and the other is the second heat exchange zone 312. Alternatively, the heat exchange element 30 may include three heat exchange zones 31, with the heat exchange power of the three heat exchange zones decreasing from top to bottom in the first direction X. In this case, the upper heat exchange zone 31 can be designated as the first heat exchange zone 311, and the middle heat exchange zone 31 can be designated as the second heat exchange zone 312. Regarding the middle heat exchange zone 31 and the lower heat exchange zone 31, the middle heat exchange zone 31 can be formed as the first heat exchange zone 311, and the lower heat exchange zone 31 can be formed as the second heat exchange zone 312. Therefore, this application does not limit the position of the first heat exchange zone 311 and the second heat exchange zone 312 within the heat exchanger 30. As long as there are two heat exchange zones 31 with different heat exchange powers, the one located closer to the pole post 21a can be defined as the first heat exchange zone 311, and the one located farther from the pole post 21a can be defined as the second heat exchange zone 312.

[0111] Furthermore, the first heat exchange zone 311 may contain one heat exchange channel 32, or at least two heat exchange channels 32. When the first heat exchange zone 311 contains at least two heat exchange channels 32, these at least two heat exchange channels 32 may be arranged side by side in the first direction X, or they may be arranged side by side in directions intersecting the first direction X. Moreover, the at least two heat exchange channels 32 may be arranged in series, or they may be arranged in parallel. Alternatively, when there are three or more heat exchange channels 32, some of the heat exchange channels 32 may be arranged in series, and some of the heat exchange channels 32 may be arranged in parallel. In addition, the heat exchange channels 32 may be arranged linearly, or they may be arranged in an arc shape, or they may be arranged in a wavy shape. This application does not limit the shape of the heat exchange channels 32.

[0112] Similarly, the second heat exchange zone 312 may have one heat exchange channel 32, or at least two heat exchange channels 32. When the second heat exchange zone 312 has at least two heat exchange channels 32, these at least two heat exchange channels 32 may be arranged side by side in the first direction X, or they may be arranged side by side in directions intersecting the first direction X. Moreover, the at least two heat exchange channels 32 may be arranged in series, or they may be arranged in parallel. Alternatively, when there are three or more heat exchange channels 32, some of the heat exchange channels 32 may be arranged in series and some of the heat exchange channels 32 may be arranged in parallel. Furthermore, the heat exchange channels 32 may be arranged linearly, or they may be arranged in an arc shape, or they may be arranged in a wavy shape. This application does not limit the shape of the heat exchange channels 32.

[0113] Furthermore, the heat exchange channel 32 in the second heat exchange zone 312 can be isolated from the heat exchange channel 32 in the first heat exchange zone 311. That is, the heat exchange channel 32 in the second heat exchange zone 312 and the heat exchange channel 32 in the first heat exchange zone 311 can operate independently of each other. In this case, the heat exchange element 30 can be provided with a first liquid inlet 351, a first liquid outlet 352, a second liquid inlet 353, and a second liquid outlet 354, as described below, so as to supply and discharge liquid to the heat exchange channel 32 of the first heat exchange zone 311 through the first liquid inlet 351 and the first liquid outlet 352; and to supply and discharge liquid to the heat exchange channel 32 of the second heat exchange zone 312 through the second liquid inlet 353 and the second liquid outlet 354. The positions of the first liquid inlet 351, the first liquid outlet 352, the second liquid inlet 353, and the second liquid outlet 354 are not limited. For example, the first liquid inlet 351 and the second liquid inlet 353 can be located on one side of the heat exchanger 30, and the first liquid outlet 352 and the second liquid outlet 354 can be located on the other side of the heat exchanger 30. Of course, the first liquid inlet 351, the first liquid outlet 352, the second liquid inlet 353, and the second liquid outlet 354 can all be located on the same side of the heat exchanger 30.

[0114] Please refer to the following: Figure 6 When the heat exchanger 30 may include a main plate 34, a collector 35, and a sealing member 36, the main plate 34 may be provided with at least two heat exchange channels 32 arranged side by side along the first direction X, and each heat exchange channel 32 extends through both ends of the main plate 34 in the extension direction of the heat exchange channel 32; the collector 35 and the sealing member 36 may be respectively provided at both ends of the main plate 34, and the collector 35 may be provided with a first liquid inlet 351 and a first liquid outlet 352, the first liquid inlet 351 and the first liquid outlet 352 respectively communicating with a portion of the heat exchange channel 32.

[0115] Of course, in some embodiments, the heat exchanger 30 may also include a main body plate 34 and two collectors 35, with the two collectors 35 respectively disposed at both ends of the main body plate 34. In this case, the first liquid inlet 351, the first liquid outlet 352, the second liquid inlet 353, and the second liquid outlet 354 can all be disposed on the collectors 35.

[0116] In other embodiments, the heat exchanger 30 may also be formed by a frame and a cover plate, and a flow channel groove may be provided in the frame. After being covered by the cover plate, the flow channel groove and the cover plate together form a heat exchange flow channel 32. Alternatively, the heat exchanger 30 may also be formed by two opposing frames, each frame having a flow channel groove. The flow channel grooves on the two frames correspondingly enclose each other to form the heat exchange flow channel 32. This application does not limit the specific structure of the heat exchanger 30.

[0117] In some embodiments, the heat exchange channel 32 in the second heat exchange zone 312 may also be connected in communication with the heat exchange channel 32 in the first heat exchange zone 311. For example, the heat exchange channel 32 in the second heat exchange zone 312 may be connected in series with the heat exchange channel 32 in the first heat exchange zone 311. Specifically, the heat exchange channel 32 in the second heat exchange zone 312 that is closer to the first heat exchange zone 311 may be connected in series with the heat exchange channel 32 in the first heat exchange zone 311 that is closer to the second heat exchange zone 312. In this case, the heat exchange element 30 may only have a first liquid inlet 351 and a first liquid outlet 352. Liquid is supplied to the heat exchange channel 32 in the first heat exchange zone 311 through the first liquid inlet 351, and liquid is discharged from the heat exchange channel 32 in the second heat exchange zone 312 through the first liquid outlet 352. The locations of the first liquid inlet 351 and the first liquid outlet 352 are not limited. For example, the first liquid inlet 351 and the first liquid outlet 352 can be located on opposite sides of the heat exchanger 30, or they can be located on the same side of the heat exchanger 30. Of course, the heat exchange channel 32 in the second heat exchange zone 312 can also be connected in parallel with the heat exchange channel 32 in the first heat exchange zone 311. In this case, the heat exchanger 30 can still only be provided with the first liquid inlet 351 and the first liquid outlet 352. Liquid is supplied to the heat exchange channel 32 in the first heat exchange zone 311 and the second heat exchange zone 312 through the first liquid inlet 351, and liquid is discharged from the heat exchange channel 32 in the first heat exchange zone 311 and the second heat exchange zone 312 through the first liquid outlet 352.

[0118] That is, this application does not limit the number and shape of the heat exchange channels 32 in each heat exchange zone 31, the arrangement and connection of the heat exchange channels 32 inside the heat exchange zone 31, or the arrangement and connection of the heat exchange channels 32 between different heat exchange zones 31.

[0119] In this embodiment, heat exchange channels 32 are provided in both the first heat exchange zone 311 and the second heat exchange zone 312, which have different heat exchange powers. This allows the first heat exchange zone 311 and the second heat exchange zone 312 to obtain the required heat exchange power by designing and adjusting the factors affecting the heat exchange power in the heat exchange channels 32 (e.g., the total heat exchange area of ​​the heat exchange channels 32, the type of heat exchange medium located in the heat exchange channels 32, the flow rate or the flow velocity). This enables the heat exchange power of each heat exchange zone 31 to be designed and adjusted to match the heat generation power of different areas of the battery cell 20, thereby enabling better effective heat exchange based on the different heat generation power of the battery cell 20 in different areas and improving the heat exchange effect of the battery cell 20 in different areas. Furthermore, by designing and adjusting the factors affecting the heat exchange power in the heat exchange channel 32, the heat exchange power of the first heat exchange zone 311 and the second heat exchange zone 312 can be different. This also means that only the internal structure of the heat exchange component 30, such as the heat exchange channel 32 and the heat exchange medium, needs to be designed and adjusted. There is no need to improve the external shape of the heat exchange component 30, which can reduce the impact on the installation of the heat exchange component 30 in the battery box 1.

[0120] Please refer to Figure 6 In one embodiment of this application, the total heat exchange area of ​​all heat exchange channels 32 in the first heat exchange zone 311 is greater than the total heat exchange area of ​​all heat exchange channels 32 in the second heat exchange zone 312.

[0121] When there is one heat exchange channel 32 within the heat exchange zone 31, the total heat exchange area of ​​all heat exchange channels 32 refers to the heat exchange area of ​​the single heat exchange channel 32 within the heat exchange zone 31. When there are two or more heat exchange channels 32 within the heat exchange zone 31, the total heat exchange area of ​​all heat exchange channels 32 refers to the sum of the heat exchange areas of the two or more heat exchange channels 32 within the heat exchange zone 31.

[0122] Furthermore, the heat exchange area of ​​heat exchange channel 32 can be determined by A=P W • L calculation. In this formula, A represents the heat transfer area of ​​heat transfer channel 32. P W The wetted perimeter refers to the perimeter of the heat exchange medium in contact with the inner wall of the heat exchange channel 32 on its cross-sectional surface. When the cross-section of the heat exchange channel 32 is rectangular or circular, and the heat exchange medium fills the heat exchange channel 32, this wetted perimeter is... W It can be equal to the perimeter of the cross-section of the heat exchange channel 32. L represents the length of the heat exchange channel 32. When there are at least two heat exchange channels 32 in the heat exchange zone 31, the heat exchange area of ​​each heat exchange channel 32 can be calculated by the above formula, and then the heat exchange areas of each heat exchange channel 32 can be added together to obtain the total area of ​​all heat exchange channels 32.

[0123] Furthermore, through the calculation formula for the heat exchange area of ​​the heat exchange channel 32, it is easy to see that the factor affecting the heat exchange area of ​​the heat exchange channel 32 is the wetted perimeter P. W And the length of the heat exchange channel 32, while the wetted perimeter P W This is related to the cross-sectional size of the heat exchange channel 32. Therefore, when designing and adjusting the heat exchange power of the heat exchange zone 31 based on the influencing factor of the total heat exchange area of ​​the heat exchange channel 32 as described above, further design adjustments can be made based on at least one of the detailed factors under this aspect. These detailed factors include, but are not limited to, the following: first, the total length of all heat exchange channels 32, including the length of a single heat exchange channel 32, or the number of heat exchange channels 32 per unit area; second, the cross-sectional area of ​​the heat exchange channel 32. In this case, to design and adjust the different total heat exchange areas of all heat exchange channels 32 in different heat exchange zones 31, so as to achieve different heat exchange power in different heat exchange zones 31, that is, the heat exchange power of the first heat exchange zone 311 and the second heat exchange zone 312 are different. The total length of all heat exchange channels 32 in the first heat exchange zone 311 and the second heat exchange zone 312 can be set to be different, or on this basis, the cross-section of the heat exchange channels 32 in the first heat exchange zone 311 and the second heat exchange zone 312 can be set to be different.

[0124] In this embodiment, the total heat exchange area of ​​all heat exchange channels 32 in the first heat exchange zone 311 is set to be greater than the total heat exchange area of ​​all heat exchange channels 32 in the second heat exchange zone 312. This makes the effective heat exchange area of ​​the first heat exchange zone 311 larger, and can remove more heat from the battery cell 20 in the same amount of time. This makes it easier to achieve a heat exchange power of the first heat exchange zone 311 that is greater than that of the second heat exchange zone 312.

[0125] Please refer to Figure 6 In one embodiment of this application, the total flow length of all heat exchange channels 32 in the first heat exchange zone 311 is greater than the total flow length of all heat exchange channels 32 in the second heat exchange zone 312.

[0126] When there is one heat exchange channel 32 within the heat exchange zone 31, the total flow length of all heat exchange channels 32 refers to the total flow length of the single heat exchange channel 32 within the heat exchange zone 31. When there are two or more heat exchange channels 32 within the heat exchange zone 31, the total flow length of all heat exchange channels 32 refers to the sum of the flow lengths of the two or more heat exchange channels 32 within the heat exchange zone 31.

[0127] Furthermore, the factors influencing the total flow channel length of the heat exchange channel 32 are the length of a single heat exchange channel 32 and the number of heat exchange channels 32 per unit area. Therefore, by setting at least one of the length of a single heat exchange channel 32 in the first heat exchange zone 311 and the second heat exchange zone 312, and the number of heat exchange channels 32 per unit area, to be different, different heat exchange powers in the different heat exchange zones 31 can be achieved. Moreover, in the first heat exchange zone 311 and the second heat exchange zone 312 with different heat exchange powers, the cross-sections of the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 can be set to be the same. Alternatively, the cross-section of the heat exchange channel 32 in the first heat exchange zone 311 can be set to be larger than the cross-section of the heat exchange channel 32 in the second heat exchange zone 312.

[0128] In this embodiment, the total flow length of all heat exchange channels 32 in the first heat exchange zone 311 is set to be greater than the total flow length of all heat exchange channels 32 in the second heat exchange zone 312. This allows the total heat exchange area of ​​all heat exchange channels 32 in the first heat exchange zone 311 to be greater than the total heat exchange area of ​​all heat exchange channels 32 in the second heat exchange zone 312, thereby enabling the first heat exchange zone 311 to have a greater heat exchange power than the second heat exchange zone 312. Moreover, at this time, only the flow length of a single heat exchange channel 32 in the first heat exchange zone 311 and the second heat exchange zone 312 needs to be designed and adjusted, or the number of heat exchange channels 32 per unit area in the first heat exchange zone 311 and the second heat exchange zone 312 needs to be designed and adjusted, making the design adjustment relatively simple and thus improving the convenience of processing and manufacturing the heat exchange component 30.

[0129] Please refer to Figure 6 In one embodiment of this application, at least two heat exchange channels 32 are provided in both the first heat exchange zone 311 and the second heat exchange zone 312; the number of heat exchange channels 32 in the first heat exchange zone 311 is greater than the number of heat exchange channels 32 in the second heat exchange zone 312 per unit area.

[0130] Within a unit area, the number of heat exchange channels 32 in the first heat exchange zone 311 is greater than the number of heat exchange channels 32 in the second heat exchange zone 312, making the heat exchange channels 32 in the first heat exchange zone 311 relatively denser and the heat exchange channels 32 in the second heat exchange zone 312 relatively sparser. In this case, the length of a single heat exchange channel 32 in the first heat exchange zone 311 can be equal to or greater than the length of a single heat exchange channel 32 in the second heat exchange zone 312.

[0131] In this embodiment, at least two parallel heat exchange channels 32 are provided in both the first heat exchange zone 311 and the second heat exchange zone 312, which allows both the first heat exchange zone 311 and the second heat exchange zone 312 to have a good heat exchange effect on the battery cell 20. Furthermore, the heat exchange channels 32 in the first heat exchange zone 311 are arranged more densely, so that only the number of heat exchange channels 32 needs to be designed and adjusted to achieve a larger total channel length of all heat exchange channels 32 in the first heat exchange zone 311. And the design and adjustment of the number of heat exchange channels 32 is relatively simple, which is conducive to improving the convenience of processing and manufacturing the heat exchange component 30.

[0132] Please refer to Figure 6 In one embodiment of this application, the heat exchange channels 32 in the first heat exchange zone 311 and the second heat exchange zone 312 are arranged side by side along the first direction X, and the distance between two adjacent heat exchange channels 32 is increased in the direction from the first end face 24 to the side of the battery cell 20 facing away from the first end face 24.

[0133] When the first direction X is the up-down direction as described above, the first end face 24 points to the side of the battery cell 20 opposite to the first end face 24, which is the direction from top to bottom.

[0134] In this embodiment, the spacing between two adjacent heat exchange channels 32 in the first heat exchange zone 311 is increased from top to bottom, and the spacing between two adjacent heat exchange channels 32 in the second heat exchange zone 312 is also increased. This allows the heat exchange power of the first heat exchange zone 311 and the second heat exchange zone 312 to decrease from top to bottom, corresponding to the decrease in the heat generation power of the battery cell 20 from top to bottom. This improves the adaptability of the heat exchanger 30 to the heat exchange effect of each region of the battery cell 20.

[0135] Of course, this application is not limited to this. In other embodiments, in the direction from the first end face 24 to the side of the battery cell 20 opposite to the first end face 24, the spacing between any two adjacent heat exchange channels 32 in the first heat exchange zone 311 can be set to be equal. Similarly, the spacing between any two adjacent heat exchange channels 32 in the second heat exchange zone 312 can also be set to be equal.

[0136] Please refer to Figure 7 or Figure 8 In one embodiment of this application, at least two heat exchange channels 32 arranged side by side are provided in both the first heat exchange zone 311 and the second heat exchange zone 312; the channel length of at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is greater than the channel length of the heat exchange channels 32 in the second heat exchange zone 312. Figure 7The heat exchange channels 32 within the heat exchanger 30 shown can be arranged in series. Figure 8 The heat exchange channels 32 in the heat exchanger 30 shown can be arranged in parallel.

[0137] The length of at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is set to be greater than the length of the heat exchange channels 32 in the second heat exchange zone 312. This means that the length of each heat exchange channel 32 in the first heat exchange zone 311 can be set to be greater than the length of each heat exchange channel 32 in the second heat exchange zone 312. Alternatively, the length of a portion of the heat exchange channels 32 in the first heat exchange zone 311 can be set to be greater than the length of each heat exchange channel 32 in the second heat exchange zone 312. Furthermore, both the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 can be linear. In this case, the heat exchange channels 32 in the first heat exchange zone 311 can be made longer along their extension direction. Of course, the heat exchange channel 32 in the first heat exchange zone 311 can be set as wavy or arc-shaped, while the heat exchange channel 32 in the second heat exchange zone 312 can be set as linear, so that the channel length of the heat exchange channel 32 in the first heat exchange zone 311 can be greater than the channel length of the heat exchange channel 32 in the second heat exchange zone 312.

[0138] In this embodiment, the flow length of at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is set to be greater than the flow length of the heat exchange channels 32 in the second heat exchange zone 312. This also allows for a larger total flow length of all heat exchange channels 32 in the first heat exchange zone 311. Furthermore, designing and adjusting the flow length of the heat exchange channels 32 is relatively simple, thereby improving the ease of processing and manufacturing the heat exchange component 30.

[0139] Please refer to Figure 9 In one embodiment of this application, the cross-sectional area of ​​at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is larger than the cross-sectional area of ​​the heat exchange channels 32 in the second heat exchange zone 312. Figure 9 The heat exchange channels 32 within the heat exchanger 30 shown can be arranged in parallel.

[0140] The cross-sectional area of ​​at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is set to be larger than that of the heat exchange channels 32 in the second heat exchange zone 312. This means that the cross-sectional area of ​​each heat exchange channel 32 in the first heat exchange zone 311 is set to be larger than that of each heat exchange channel 32 in the second heat exchange zone 312. Alternatively, the cross-sectional area of ​​a portion of the heat exchange channels 32 in the first heat exchange zone 311 may be set to be larger than that of each heat exchange channel 32 in the second heat exchange zone 312. In addition, when the cross-sectional area of ​​at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is set to be greater than the cross-sectional area of ​​the heat exchange channels 32 in the second heat exchange zone 312, the total length of all the heat exchange channels 32 in the first heat exchange zone 311 can be set to be greater than the total length of all the heat exchange channels 32 in the second heat exchange zone 312, or it can be set to be equal to the total length of all the heat exchange channels 32 in the second heat exchange zone 312.

[0141] In this embodiment, the cross-sectional area of ​​at least a portion of the heat exchange channels 32 in the first heat exchange zone 311 is set to be larger than that of the heat exchange channels 32 in the second heat exchange zone 312. This allows the total heat exchange area of ​​all the heat exchange channels 32 in the first heat exchange zone 311 to be greater than that of all the heat exchange channels 32 in the second heat exchange zone 312, thereby enabling the first heat exchange zone 311 to have a greater heat exchange power than the second heat exchange zone 312. Moreover, when shaping the heat exchange channels 32, only the cross-sectional size of the heat exchange channels 32 in the first and second heat exchange zones 311 needs to be designed and adjusted, making the design adjustment simpler and thus improving the convenience of processing and manufacturing the heat exchange component 30.

[0142] Please refer to Figure 6 In one embodiment of this application, the heat exchange channel 32 in the first heat exchange zone 311 is connected to the heat exchange channel 32 in the second heat exchange zone 312.

[0143] As described above, the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 can be connected in series or in parallel.

[0144] In this embodiment, the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 are connected. For example, when all the heat exchange channels 32 in the first heat exchange zone 311 and all the heat exchange channels 32 in the second heat exchange zone 312 are connected in series, two heat exchange channels 32 that are close to each other in the first and second heat exchange zones 311 can be connected in series, thus achieving a series connection between the heat exchange channels 32 in the first and second heat exchange zones 311 and the heat exchange channels 32 in the second heat exchange zone 312. At this time, a first liquid inlet 351 connected to the heat exchange channels 32 in the first heat exchange zone 311 and a first liquid outlet 352 connected to the heat exchange channels 32 in the second heat exchange zone 312 can be provided, so that the supply and discharge of liquid to the heat exchange component 30 can be achieved using a single heat exchange medium circulation system, thereby simplifying the number of components. Of course, the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 can be connected to the first liquid inlet 351 and the first liquid outlet 352, so that the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 are connected in parallel. Alternatively, a single heat exchange medium circulation system can be used.

[0145] Please refer to Figure 6 In one embodiment of this application, the heat exchange channel 32 in the first heat exchange zone 311 is connected in series with the heat exchange channel 32 in the second heat exchange zone 312; the heat exchange element 30 is provided with a first liquid inlet 351 and a first liquid outlet 352, the first liquid inlet 351 is connected to the heat exchange channel 32 in the first heat exchange zone 311, and the first liquid outlet 352 is connected to the heat exchange channel 32 in the second heat exchange zone 312.

[0146] In this embodiment, the heat exchange channel 32 in the first heat exchange zone 311 and the heat exchange channel 32 in the second heat exchange zone 312 are connected in series, and the first liquid inlet 351 is connected to the heat exchange channel 32 in the first heat exchange zone 311. This allows the heat exchange medium to first pass through the heat exchange channel 32 in the first heat exchange zone 311 and then through the heat exchange channel 32 in the second heat exchange zone 312. This enables the heat exchange medium to perform heat exchange and cooling on the area of ​​the battery cell 20 near the electrode post 21a when the temperature is relatively low, thereby improving the heat exchange and cooling efficiency of the battery cell 20.

[0147] Please refer to Figure 6In one embodiment of this application, along the first direction X, at least two heat exchange channels 32 are provided in both the first heat exchange zone 311 and the second heat exchange zone 312, arranged side by side; the at least two heat exchange channels 32 in the first heat exchange zone 311 are arranged in series, the at least two heat exchange channels 32 in the second heat exchange zone 312 are arranged in series, and the two heat exchange channels 32 closest to the first heat exchange zone 311 and the second heat exchange zone 312 are arranged in series; the first liquid inlet 351 is connected to the heat exchange channel 32 in the first heat exchange zone 311 that is furthest from the second heat exchange zone 312, and the first liquid outlet 352 is connected to the heat exchange channel in the second heat exchange zone 312 that is furthest from the first heat exchange zone 311.

[0148] In this embodiment, the heat exchange channels 32 in the first heat exchange zone 311 and the second heat exchange zone 312 are arranged side by side along the first direction X and in series. This allows the heat exchange medium to perform heat exchange and cooling on the relatively high-temperature area of ​​the battery cell 20 near the electrode post 21a when the temperature is relatively low, whether in the first heat exchange zone 311 or the second heat exchange zone 312. This helps to further improve the heat exchange and cooling efficiency of the battery cell 20.

[0149] Please refer to Figure 10 In one embodiment of this application, the heat exchange channel 32 in the first heat exchange zone 311 is isolated from the heat exchange channel 32 in the second heat exchange zone 312; the heat exchange element 30 is provided with a first liquid inlet 351, a first liquid outlet 352, a second liquid inlet 353 and a second liquid outlet 354; the first liquid inlet 351 and the first liquid outlet 352 are connected to the heat exchange channel 32 in the first heat exchange zone 311; the second liquid inlet 353 and the second liquid outlet 354 are connected to the heat exchange channel 32 in the second heat exchange zone 312.

[0150] In this embodiment, the heat exchange channel 32 in the first heat exchange zone 311 is isolated from the heat exchange channel 32 in the second heat exchange zone 312, allowing them to operate independently. At this time, the first liquid inlet 351 and the first liquid outlet 352 can be connected to the heat exchange channel 32 in the first heat exchange zone 311, and the second liquid inlet 353 and the second liquid outlet 354 can be connected to the heat exchange channel 32 in the second heat exchange zone 312. This allows for the supply and discharge of liquid to the heat exchange channels 32 in the first and second heat exchange zones 311 and 312 respectively through two sets of heat exchange medium circulation systems. This facilitates the design and adjustment of the control parameters of the respective heat exchange medium circulation systems in the first and second heat exchange zones 311 to achieve different heat exchange capacities in the first and second heat exchange zones 312.

[0151] The control parameters of the heat exchange medium circulation system include, but are not limited to, the type of heat exchange medium, the flow rate of the heat exchange medium, and the flow velocity of the heat exchange medium. Therefore, to achieve a difference in heat exchange power between the first heat exchange zone 311 and the second heat exchange zone 312, at least one of the following can be designed and adjusted: the type of heat exchange medium, the flow rate of the heat exchange medium, and the flow velocity of the heat exchange medium. For example, the types of heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312 can be set differently. That is, the first heat exchange zone 311 uses a heat exchange medium with a relatively higher specific heat capacity or thermal conductivity (e.g., water), while the second heat exchange zone 312 uses a heat exchange medium with a relatively lower specific heat capacity or thermal conductivity (e.g., oil). This will result in the heat exchange power of the first heat exchange zone 311 being greater than that of the second heat exchange zone 312. Of course, on this basis, the flow rate and / or velocity of the heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312 can be set to be different, so as to further differentiate the heat exchange power of different heat exchange zones 31.

[0152] That is, by designing and adjusting the type of heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312, or by controlling the volumetric flow rate of the power pump in the heat exchange medium circulation system, the flow rate and velocity of the heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312 can be adjusted, thus obtaining different heat exchange powers for the first heat exchange zone 311 and the second heat exchange zone 312. In this case, the design and adjustment of the heat exchange medium type and the control of the volumetric flow rate of the power pump are relatively simple, and no adjustment to the structural design of the heat exchange component 30 itself is required, thereby improving the convenience of achieving different heat exchange powers for the first heat exchange zone 311 and the second heat exchange zone 312. The heat exchange medium circulation system can also have a circulation pipeline, and the power pump can be installed on the circulation pipeline; this circulation pipeline can be used for supplying and discharging liquid from the heat exchange channel 32, and the power pump can be used to drive the heat exchange medium to circulate within the heat exchange channel 32 and the circulation pipeline.

[0153] In addition, it should be noted that the design adjustment of the flow rate and flow rate of the heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312 can also be achieved by setting the cross-sectional size or shape of the heat exchange channel 32 of the first heat exchange zone 311 and the second heat exchange zone 312 to be different, so as to achieve different flow rates or flow rates of the heat exchange medium in the first heat exchange zone 311 and the second heat exchange zone 312.

[0154] Furthermore, when the heat exchange channels 32 in the first heat exchange zone 311 and the heat exchange channels 32 in the second heat exchange zone 312 are isolated from each other, the first heat exchange zone 311 and the second heat exchange zone 312 can be integrally molded, for example, by using a co-extrusion molding process for integral extrusion molding. Of course, the first heat exchange zone 311 and the second heat exchange zone 312 can also be set as separate structures, so that they can be manufactured independently.

[0155] In one embodiment of this application, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the first heat exchange zone 311 is less than the total thermal resistance of the heat transfer path formed by the battery cell 20 and the second heat exchange zone 312.

[0156] The heat transfer path refers to the heat transfer path from the battery cell 20 through the heat exchanger 30 to the heat exchange medium in the heat exchange channel 32. Therefore, the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchange zone 31 includes the contact thermal resistance at the contact interface between the battery cell 20 and the heat exchanger 30 and the thermal resistance of the heat exchanger 30 itself. Thus, in order to achieve a difference in the heat exchange power of the first heat exchange zone 311 and the second heat exchange zone 312, at least one of the contact thermal resistance between the battery cell 20 and the heat exchanger 30 and the thermal resistance of the heat exchanger 30 itself can be designed and adjusted. For example, the contact thermal resistance between the first heat exchange zone 311 and the battery cell 20 can be set to be different from the contact thermal resistance between the second heat exchange zone 312 and the battery cell 20. Of course, it is also possible to further differentiate the heat exchange power of the different heat exchange zones 31 by setting the thermal resistance of the first heat exchange zone 311 and the second heat exchange zone 312 to be different. In addition, when the total thermal resistance of the heat transfer path formed by the battery cell 20 and the heat exchange zone 31 is designed and adjusted to achieve different heat exchange powers of the first heat exchange zone 311 and the second heat exchange zone 312, the type of heat exchange component 30 can be a liquid cooling plate or liquid cooling pipe structure with heat exchange flow channel 32 as described above, or it can be a phase change energy storage structure.

[0157] In this embodiment, by adjusting the total thermal resistance design of the heat transfer path formed by the battery cell 20, the first heat exchange zone 311, and the second heat exchange zone 312, the heat exchange power of the first heat exchange zone 311 and the second heat exchange zone 312 is different. This design adjustment is mainly concentrated on the outside of the heat exchange channel 32, which can improve the convenience of its design adjustment.

[0158] Please refer to Figure 11 In one embodiment of this application, the thermal conductivity of the material of the heat exchanger 30 in the first heat exchange zone 311 is greater than that of the material in the second heat exchange zone 312.

[0159] In this embodiment, the thermal conductivity of the material of the heat exchanger 30 in the first heat exchange zone 311 is set to be higher than that in the second heat exchange zone 312, so that the thermal resistance of the first heat exchange zone 311 can be lower, thereby facilitating the rapid conduction and heat dissipation of the heat generated by the battery cell 20 in the first heat exchange zone 311, so as to improve the heat exchange effect in the area with high heat generation power in the battery cell 20.

[0160] Where the thermal conductivity of the first heat exchange zone 311 and the second heat exchange zone 312 are set to be different, the first heat exchange zone 311 and the second heat exchange zone 312 can be integrally molded, for example, by using a co-extrusion molding process for integral extrusion molding. Of course, the first heat exchange zone 311 and the second heat exchange zone 312 can also be set as separate structures, so that they can be manufactured independently.

[0161] Furthermore, when the heat exchanger 30 includes a main plate 34, a collector 35, and a sealing member 36 as described above, the heat exchange channel 32 is mainly disposed on the main plate 34. Therefore, in order to achieve a thermal conductivity of the first heat exchange zone 311 greater than that of the second heat exchange zone 312, the thermal conductivity of the material of the main plate 34 in the first heat exchange zone 311 can be set to be greater than that of the material of the main plate 34 in the second heat exchange zone 312. The thermal conductivity of the materials of the collector 35 and the sealing member 36 in the first and second heat exchange zones 311 is not required. Similarly, in some embodiments, when the heat exchanger 30 includes a main plate 34 and two collectors 35, with the two collectors 35 respectively disposed at both ends of the main plate 34, the thermal conductivity of the material of the main plate 34 in the first heat exchange zone 311 can also be set to be greater than that of the material of the main plate 34 in the second heat exchange zone 312.

[0162] Please refer to Figure 13 In one embodiment of this application, the heat exchanger 30 has a heat exchange wall 33 opposite to the battery cell 20, and the heat exchange wall 33 is heat-exchange connected to the peripheral surface 25 of the battery cell 20; the thickness of the heat exchange wall 33 of the first heat exchange zone 311 is less than the thickness of the heat exchange wall 33 of the second heat exchange zone 312.

[0163] The heat exchange wall can be located between the battery cell 20 and the heat exchange channel 32 of the heat exchange component 30.

[0164] In this embodiment, setting the thickness of the heat exchange wall 33 of the first heat exchange zone 311 to be less than the thickness of the heat exchange wall 33 of the second heat exchange zone 312 can also result in a lower thermal resistance of the first heat exchange zone 311, thereby facilitating the rapid conduction and dissipation of heat generated by the battery cell 20 through the first heat exchange zone 311, and improving the heat exchange effect on areas with high heat generation power in the battery cell 20. When the thickness of the heat exchange wall 33 of the first heat exchange zone 311 is thinner, the cross-sectional area of ​​the heat exchange channel 32 within the first heat exchange zone 311 can be correspondingly larger than the cross-sectional area of ​​the heat exchange channel 32 within the second heat exchange zone 312. Of course, the cross-sectional area of ​​the heat exchange channel 32 in the first heat exchange zone 311 can also be set to be equal to the cross-sectional area of ​​the heat exchange channel 32 in the second heat exchange zone 312. However, the center line of the heat exchange channel 32 in the first heat exchange zone 311 can be closer to the battery cell 20 than the center line of the heat exchange channel 32 in the second heat exchange zone 312.

[0165] Please refer to Figure 12 In one embodiment of this application, the battery device 100 further includes a thermal interface material layer 40, which is disposed between the battery cell 20 and the first heat exchange zone 311.

[0166] Thermal interface material (TIM) is a general term for materials used to reduce the contact thermal resistance between two heat exchange components. These materials can include thermal grease, thermal pads, silicone, or thermal adhesives.

[0167] In this embodiment, a thermal interface material layer 40 is provided between the battery cell 20 and the first heat exchange zone 311. This reduces the thermal resistance between the two, thereby improving the heat exchange power of the first heat exchange zone 311. The thermal interface material layer 40 can be a coating or a sheet structure to minimize its thickness and reduce its impact on the bonding and stacking between the second heat exchange zone 312 and the battery cell 20. Alternatively, in some embodiments, a step can be formed in the first heat exchange zone 311 to accommodate the thermal interface material layer 40.

[0168] Please refer to Figure 14 In one embodiment of this application, at least two heat exchange zones 31 include an end heat exchange zone 313. The end heat exchange zone 313 is located closest to the pole post 21a compared to the other heat exchange zones 31, and the heat exchange power of the end heat exchange zone 313 is greater than that of the other heat exchange zones 31. In the first direction X, the coverage rate of the end heat exchange zone 313 on the circumferential surface 25 is defined as p, which satisfies the relationship: 0.3≤p≤0.6.

[0169] When the first direction X is the vertical direction as described above, and the pole post 21a is set upwards, the end heat exchange zone 313 is the uppermost heat exchange zone 31 among all heat exchange zones 31.

[0170] In this embodiment, along the first direction X, the coverage p of the end heat exchange region 313 closest to the electrode 21a on the peripheral surface 25 is set to 0.3 to 0.6. This allows the end heat exchange region 313, which has a large heat exchange power, to cover most of the area of ​​the peripheral surface 25 of the battery cell 20 near the electrode 21a, thereby improving the heat exchange efficiency of the battery cell 20. p can be 0.3, 0.4, 0.5, or 0.6, or any of the values ​​mentioned above. Furthermore, since the heat exchange power of the end heat exchange region 313 is greater than that of other heat exchange regions 31, the end heat exchange region 313 forms the first heat exchange region 311 as described above, in relation to other heat exchange regions 31.

[0171] Please refer to Figure 15 In one embodiment of this application, the height of the battery cell 20 between the first end face 24 and the side opposite to the first end face 24 is defined as H, and the thickness of the battery cell 20 in the arrangement direction of the two large surfaces 251 is defined as D, satisfying the relationship: 0 < D / H ≤ 0.5.

[0172] In this embodiment, the thickness-to-height ratio of the battery cell 20 is less than or equal to 0.5, making the battery cell 20 relatively thin and relatively tall. At this point, the area of ​​the electrode plates inside the battery cell 20 is relatively large, but the cross-section of the tab 231 is relatively small, making it easy for a large amount of heat to be generated at this location and difficult to dissipate, resulting in excessively high temperatures in the area near the electrode post 21a. Therefore, for this type of battery cell 20, using a heat exchanger 30 with at least two heat exchange zones 31, and at least some of the heat exchange zones 31 having different heat exchange powers, can further improve the heat dissipation effect of the battery cell 20 near the electrode post 21a.

[0173] In one embodiment of this application, the number of heat exchange zones 31 is at least three, and the at least three heat exchange zones 31 are arranged along the first direction X.

[0174] In this embodiment, the number of heat exchange zones 31 is set to at least three, and they are arranged along the first direction X. This allows the area of ​​each heat exchange zone 31 to be relatively small, thereby facilitating more precise heat exchange and cooling control of the corresponding areas on the peripheral surface 25 of the battery cell 20 through the at least three heat exchange zones 31 on the heat exchange component 30. This further improves the targeting of heat exchange for different areas on the peripheral surface 25 of the battery cell 20. At this time, among the at least three heat exchange zones 31, only two heat exchange zones 31 may have different heat exchange powers, or more heat exchange zones 31 may have different heat exchange powers, or all heat exchange zones 31 may have different heat exchange powers.

[0175] In one embodiment of this application, the number of heat exchange zones 31 is at least three, and the heat exchange power of at least three heat exchange zones 31 is set to decrease in the direction from the first end face 24 to the side of the battery cell 20 facing away from the battery cell 20.

[0176] In this embodiment, the number of heat exchange zones 31 can be three, four, or more. When the first end face 24 is facing upwards, the heat exchange power of each heat exchange zone 31 can gradually decrease from top to bottom. At this time, the number of heat exchange zones 31 is quite diverse, and the heat exchange power of each heat exchange zone 31 decreases from top to bottom. This allows for better adaptation to the decreasing heat generation power of the peripheral surface 25 of the battery cell 20 from top to bottom, achieving more targeted heat exchange and cooling of different areas of the battery cell 20 and improving the heat exchange and cooling effect of the heat exchanger 30 on various areas of the battery cell 20.

[0177] In one embodiment of this application, the battery cell 20 has two terminals 21a (a positive terminal and a negative terminal, respectively), and both terminals 21a are disposed on the first end face 24.

[0178] In this embodiment, the two terminals 21a of the battery cell 20 are arranged on the same side of the battery cell 20, which facilitates the centralized arrangement of the terminals 21a and the electrical connection between adjacent battery cells 20. At the same time, it also makes the direction from the direction closer to the terminal 21a to the direction farther away from the terminal 21a in the first direction X a single direction, which facilitates the arrangement of at least two heat exchange zones 31 with different heat exchange powers in a single direction. For example, when the first direction X is vertical and the first end face 24 is facing upward, each heat exchange zone 31 can be arranged along a single direction from top to bottom.

[0179] Please refer to the reference. Figures 2 to 6In one embodiment of this application, the battery device 100 includes a battery cell 20 and a heat exchanger 30. The battery cell 20 has a first end face 24 and a peripheral surface 25. The first end face 24 is provided with an electrode post 21a, and the peripheral surface 25 is connected to the first end face 24. The heat exchanger 30 is heat-exchange connected to the peripheral surface 25 and is provided with at least two heat exchange zones 31. The normal direction of the first end face 24 is defined as the first direction X, and the at least two heat exchange zones 31 are arranged along the first direction X. At least two heat exchange zones 31 have different heat exchange powers. In the heat exchange zones 31 with different power, the heat exchange zone 31 located near the pole post 21a is defined as the first heat exchange zone 311, and the heat exchange zone 31 located away from the pole post 21a is defined as the second heat exchange zone 312. The heat exchange power of the first heat exchange zone 311 is greater than that of the second heat exchange zone 312. Both the first heat exchange zone 311 and the second heat exchange zone 312 are provided with at least two heat exchange channels 32 arranged side by side. In a unit area, the number of heat exchange channels 32 in the first heat exchange zone 311 is greater than the number of heat exchange channels 32 in the second heat exchange zone 312.

[0180] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell, the battery cell having a first end face and a peripheral face, the first end face having an electrode post, and the peripheral face being connected to the first end face; and A heat exchanger is provided in a heat exchange connection with the peripheral surface and has at least two heat exchange zones; the normal direction of the first end face is defined as the first direction, and the at least two heat exchange zones are arranged along the first direction. Among them, at least two of the heat exchange zones have different heat exchange powers. In any two heat exchange zones with different heat exchange powers, the heat exchange zone that is closer to the pole is defined as the first heat exchange zone, and the heat exchange zone that is farther away from the pole is defined as the second heat exchange zone. The heat exchange power of the first heat exchange zone is greater than that of the second heat exchange zone. The number of heat exchange zones is at least three, and the at least three heat exchange zones are arranged along the first direction.

2. The battery device as claimed in claim 1, characterized in that, Both the first heat exchange zone and the second heat exchange zone are equipped with heat exchange channels.

3. The battery device as claimed in claim 2, characterized in that, The total heat exchange area of ​​all the heat exchange channels in the first heat exchange zone is greater than the total heat exchange area of ​​all the heat exchange channels in the second heat exchange zone.

4. The battery device as claimed in claim 3, characterized in that, The total flow path length of all heat exchange channels in the first heat exchange zone is greater than the total flow path length of all heat exchange channels in the second heat exchange zone.

5. The battery device as claimed in claim 4, characterized in that, Both the first heat exchange zone and the second heat exchange zone are provided with at least two heat exchange channels arranged side by side; Within a unit area, the number of heat exchange channels in the first heat exchange zone is greater than the number of heat exchange channels in the second heat exchange zone.

6. The battery device as claimed in claim 5, characterized in that, The heat exchange channels in the first heat exchange zone and the second heat exchange zone are arranged side by side along the first direction, and the spacing between two adjacent heat exchange channels is increased in the direction from the first end face to the side of the battery cell facing away from the first end face.

7. The battery device as claimed in claim 4, characterized in that, Both the first heat exchange zone and the second heat exchange zone are provided with at least two heat exchange channels arranged side by side; The length of at least a portion of the heat exchange channels in the first heat exchange zone is greater than the length of the heat exchange channels in the second heat exchange zone.

8. The battery device as claimed in claim 3, characterized in that, The cross-sectional area of ​​at least a portion of the heat exchange channels in the first heat exchange zone is larger than the cross-sectional area of ​​the heat exchange channels in the second heat exchange zone.

9. The battery device as claimed in claim 2, characterized in that, The heat exchange channels in the first heat exchange zone are connected to the heat exchange channels in the second heat exchange zone.

10. The battery device as claimed in claim 9, characterized in that, The heat exchange channels in the first heat exchange zone are connected in series with the heat exchange channels in the second heat exchange zone; The heat exchanger is provided with a first liquid inlet and a first liquid outlet. The first liquid inlet is connected to the heat exchange channel in the first heat exchange zone, and the first liquid outlet is connected to the heat exchange channel in the second heat exchange zone.

11. The battery device as claimed in claim 10, characterized in that, Along the first direction, both the first heat exchange zone and the second heat exchange zone are provided with at least two heat exchange channels arranged side by side; At least two heat exchange channels in the first heat exchange zone are connected in series, at least two heat exchange channels in the second heat exchange zone are connected in series, and the two heat exchange channels closest to the first heat exchange zone and the second heat exchange zone are connected in series. The first liquid inlet is connected to the heat exchange channel in the first heat exchange zone that is furthest from the second heat exchange zone, and the first liquid outlet is connected to the heat exchange channel in the second heat exchange zone that is furthest from the first heat exchange zone.

12. The battery device as claimed in claim 2, characterized in that, The heat exchange channels in the first heat exchange zone are isolated from the heat exchange channels in the second heat exchange zone; The heat exchanger is provided with a first liquid inlet, a first liquid outlet, a second liquid inlet, and a second liquid outlet; The first liquid inlet and the first liquid outlet are connected to the heat exchange channel in the first heat exchange zone; The second liquid inlet and the second liquid outlet are connected to the heat exchange channel in the second heat exchange zone.

13. The battery device as claimed in claim 12, characterized in that, The heat exchange medium in the heat exchange channel located in the first heat exchange zone is of a different type than the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

14. The battery device as claimed in claim 12, characterized in that, The flow rate of the heat exchange medium in the heat exchange channel located in the first heat exchange zone is greater than the flow rate of the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

15. The battery device as claimed in claim 12, characterized in that, The flow velocity of the heat exchange medium in the heat exchange channel located in the first heat exchange zone is greater than the flow velocity of the heat exchange medium in the heat exchange channel located in the second heat exchange zone.

16. The battery device according to any one of claims 1 to 15, characterized in that, The total thermal resistance of the heat transfer path formed by the battery cell and the first heat exchange zone is less than the total thermal resistance of the heat transfer path formed by the battery cell and the second heat exchange zone.

17. The battery device as claimed in claim 16, characterized in that, The thermal conductivity of the material of the heat exchanger in the first heat exchange zone is greater than that of the material in the second heat exchange zone.

18. The battery device as claimed in claim 16, characterized in that, The battery device further includes a thermal interface material layer, which is disposed between the battery cell and the first heat exchange zone.

19. The battery device as claimed in claim 16, characterized in that, The heat exchanger has a heat exchange wall surface opposite to the battery cell, and the heat exchange wall surface is heat-exchange connected to the peripheral surface of the battery cell. The thickness of the heat exchange wall in the first heat exchange zone is less than the thickness of the heat exchange wall in the second heat exchange zone.

20. The battery device according to any one of claims 1 to 15, characterized in that, At least two of the heat exchange zones include an end heat exchange zone, which is located closest to the pole column compared to the other heat exchange zones, and the heat exchange power of the end heat exchange zone is greater than that of the other heat exchange zones. In the first direction, the coverage of the end heat exchange zone on the circumferential surface is defined as p, satisfying the relationship: 0.3≤p≤0.

6.

21. The battery device according to any one of claims 1 to 15, characterized in that, The peripheral surface includes two opposing large surfaces and two opposing small surfaces, the area of ​​the large surfaces is larger than the area of ​​the small surfaces, and the heat exchanger is connected to the large surfaces in a heat exchange connection. The height of the battery cell between the first end face and the side opposite to the first end face is defined as H, and the thickness of the battery cell in the arrangement direction of the two large faces is defined as D, satisfying the relationship: 0 < D / H ≤ 0.

5.

22. The battery device according to any one of claims 1 to 15, characterized in that, In the direction from the first end face toward the side of the battery cell opposite to the battery cell, the heat exchange power of at least three of the heat exchange zones is set to decrease.

23. The battery device according to any one of claims 1 to 15, characterized in that, The battery cell has two terminals, both of which are located on the first end face.

24. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 23.

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