Battery pack and electric device

Abstract

This application discloses a battery pack and an electrical device, relating to the field of battery technology. The battery pack includes at least two battery groups, each group comprising at least two individual cells. The battery pack also includes a heat exchange assembly with at least two heat exchange flow paths. Each heat exchange flow path is equipped with a corresponding control element. The heat exchange flow paths are used to carry heat exchange fluid, and each control element controls the opening or closing of the corresponding heat exchange flow path. Each heat exchange flow path is positioned opposite to each individual cell in the corresponding battery group. Through this method, this application helps to reduce the temperature difference between different individual cells in the battery pack and simplifies the structure of the heat exchange assembly in the battery pack, thereby reducing cost and weight.

Description

Technical Field

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

[0002] In recent years, electric vehicles, with their significant advantages in energy conservation and environmental protection, have ushered in unprecedented development opportunities. The power battery is the power source of electric vehicles, and its performance greatly affects the vehicle's power, economy, and lifespan. Batteries generate a large amount of heat during charging and discharging, so battery packs generally have a cooling system. However, due to inconsistent heat dissipation capabilities among individual cells, temperature differences arise between them. This temperature inconsistency exacerbates performance inconsistencies among individual cells and accelerates the aging of cells in high-temperature areas, leading to a decline in the overall performance of the battery pack system. Utility Model Content

[0003] This application provides a battery pack and an electrical device that helps reduce the temperature difference between different individual cells in the battery pack and simplifies the structure of the heat exchange components in the battery pack, thereby reducing cost and weight.

[0004] This application provides a battery pack. The battery pack includes at least two battery groups, each battery group including at least two individual cells. The battery pack also includes a heat exchange assembly, which includes at least two heat exchange flow paths. Each heat exchange flow path is correspondingly configured with a control element. The heat exchange flow path is used to pass heat exchange fluid, and each control element is used to control the opening or closing of the corresponding heat exchange flow path. Each heat exchange flow path is arranged opposite to each individual cell of the corresponding battery group.

[0005] In one embodiment of this application, the battery pack has intersecting first directions and a reference plane, and the battery pack and heat exchange components are stacked along the first direction; wherein, the orthographic projection of each heat exchange flow path on the reference plane overlaps with the orthographic projection of each individual cell of the corresponding battery pack on the reference plane.

[0006] In one embodiment of this application, the battery pack has an intersecting second direction and a third direction, and at least two battery packs are distributed along the second direction; each heat exchange flow path includes at least two connected main flow segments, the at least two main flow segments are distributed along the second direction, and each main flow segment extends along the third direction, wherein each main flow segment of each heat exchange flow path is respectively arranged opposite to different individual cells of the corresponding battery pack.

[0007] In one embodiment of this application, each battery pack includes at least two individual cells distributed along a third direction, with the main road section being positioned opposite to at least two individual cells adjacent to each other in the third direction.

[0008] In one embodiment of this application, each battery pack includes at least two individual cells distributed along a second direction; the heat exchange flow path further includes a first connecting flow path section and a second connecting flow path section; in the second direction, the first connecting flow path section is located between two adjacent main flow path sections, and the first connecting flow path section is connected to the main flow path sections on both sides through a second connecting flow path section; the first connecting flow path section extends along a third direction; in two adjacent individual cells in the second direction, the first connecting flow path section is disposed opposite to at least one individual cell.

[0009] In one embodiment of this application, the heat exchange assembly further includes: a heat exchange plate having at least two heat exchange flow paths formed therein; an inlet pipe communicating with the at least two heat exchange flow paths; and an outlet pipe communicating with the at least two heat exchange flow paths; wherein the inlet pipe and / or the outlet pipe are provided with control elements.

[0010] In one embodiment of this application, the inlet pipe includes an inlet main pipe and at least two inlet branch pipes connected to the inlet main pipe, each inlet branch pipe being connected to a corresponding heat exchange flow path; the outlet pipe includes an outlet main pipe and at least two outlet branch pipes connected to the outlet main pipe, each outlet branch pipe being connected to a corresponding heat exchange flow path; wherein, each inlet branch pipe is provided with a control element, and / or each outlet branch pipe is provided with a control element.

[0011] In one embodiment of this application, the battery pack has a first direction, and individual cells and heat exchange plates are stacked along the first direction; at least two inlet branch pipes are connected to one side of the heat exchange plate in the first direction, and an inlet main pipe is connected to the side of the at least two inlet branch pipes away from the heat exchange plate; at least two outlet branch pipes are connected to one side of the heat exchange plate in the first direction, and an outlet main pipe is connected to the side of the at least two outlet branch pipes away from the heat exchange plate.

[0012] In one embodiment of this application, the inlet pipe and the outlet pipe are respectively connected to opposite sides of the heat exchange plate.

[0013] Accordingly, this application also provides an electrical device, including a battery pack as described in the above embodiments, wherein the battery pack is a power supply for the electrical device.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides a battery pack and an electrical device. The battery pack includes at least two battery groups, and each battery group includes at least two individual cells. The battery pack also includes a heat exchange assembly with at least two heat exchange flow paths. Each heat exchange flow path is positioned opposite to each individual cell in the corresponding battery group, and each heat exchange flow path is used to exchange heat with each individual cell in the corresponding battery group, ensuring that the individual cells have a reasonable operating temperature to guarantee their performance. Furthermore, each heat exchange flow path is equipped with a corresponding control element, which controls the opening or closing of the corresponding heat exchange flow path, enabling independent control of each heat exchange flow path. This allows for flexible adjustment of the operating temperature of individual cells in different battery groups, thus helping to reduce the temperature difference between different individual cells and ensuring the overall performance of the battery pack.

[0015] Furthermore, this application arranges one heat exchange flow path opposite to multiple individual cells to synchronously regulate the operating temperature of each individual cell in the battery pack corresponding to the heat exchange flow path. Compared to designing different heat exchange flow paths for each individual cell, this application designs different heat exchange flow paths for each battery pack, and each individual cell in the same battery pack exchanges heat with the same heat exchange flow path. This reduces the number of heat exchange flow paths and control components, thereby simplifying the structure of the heat exchange assembly and reducing cost and weight. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this application;

[0018] Figure 2 This is a schematic diagram of the structure of a single cell and heat exchange assembly in the battery pack of this application;

[0019] Figure 3 This is a schematic diagram of the structure of an embodiment of the heat exchange component of this application;

[0020] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of the heat exchange component along the AA direction.

[0021] Figure 5 This is a schematic diagram of the structure of an embodiment of the battery pack in the battery pack of this application;

[0022] Figure 6This is a schematic diagram of an embodiment of the heat exchange flow path and the single cell projected onto a reference plane in this application.

[0023] Figure 7 yes Figure 3 The diagram shows a structural schematic of the heat exchange component from another perspective.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10-Battery pack; 11-Battery array; 111-Single cell; 12-Heat exchange assembly; 121-Heat exchange flow path; 122-Main flow path; 123-First connecting flow path; 124-Second connecting flow path; 125-Heat exchange plate; 126-Inlet pipe; 1261-Inlet main pipe; 1262-Inlet branch pipe; 127-Outlet pipe; 1271-Outlet main pipe; 1272-Outlet branch pipe; 13-Control element; Z-First direction; X-Second direction; Y-Third direction; α-Reference plane. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0027] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] This application provides a battery pack and an electrical device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0029] To address the technical problem of significant temperature differences between different individual battery cells in existing technologies, one embodiment of this application provides a battery pack. The battery pack includes at least two battery groups, each group comprising at least two individual battery cells. The battery pack also includes a heat exchange assembly with at least two heat exchange flow paths. Each heat exchange flow path is equipped with a corresponding control element. The heat exchange flow paths are used to allow heat exchange fluid to pass through, and each control element controls the opening or closing of the corresponding heat exchange flow path. Each heat exchange flow path is positioned opposite to each individual battery cell in its corresponding battery group. This will be described in detail below.

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this application.

[0031] In one embodiment, the battery pack 10 includes individual battery cells 111. Individual battery cells 111 include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific type. The battery pack 10 provides power to an electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0032] Please refer to the following: Figures 2 to 4 The battery pack 10 also includes a heat exchange assembly 12. The heat exchange assembly 12 includes a heat exchange flow path 121, which is used to exchange heat with the individual battery cells 111 by passing a heat exchange fluid, ensuring that the individual battery cells 111 have a reasonable operating temperature, thereby ensuring the overall performance of the battery pack 10. The heat exchange assembly 12 can be used in both heating and cooling conditions. When the heat exchange assembly 12 is used in the heating condition, the operating temperature of the individual battery cells 111 is relatively low, and the heat exchange flow path 121 uses a higher-temperature heat exchange fluid to heat the individual battery cells 111; when the heat exchange assembly 12 is used in the cooling condition, the operating temperature of the individual battery cells 111 is relatively high, and the heat exchange flow path 121 uses a lower-temperature heat exchange fluid to cool the individual battery cells 111.

[0033] Please refer to the following: Figure 5 , Figure 5 This is a schematic diagram of the structure of an embodiment of the battery pack in the battery pack of this application.

[0034] In one embodiment, the battery pack 10 includes at least two battery groups 11, each battery group 11 including at least two individual cells 111. The heat exchange assembly 12 includes at least two heat exchange flow paths 121, each heat exchange flow path 121 being correspondingly configured with a control element 13. Each control element 13 is used to control the corresponding heat exchange flow path 121 to be turned on or off, wherein each heat exchange flow path 121 is arranged opposite to each individual cell 111 of the corresponding battery group 11.

[0035] In this embodiment, each heat exchange flow path 121 is equipped with a corresponding control element 13. Each control element 13 is used to control the conduction or blocking of the corresponding heat exchange flow path 121, realizing independent control of each heat exchange flow path 121. This allows for flexible adjustment of the operating temperature of individual cells 111 in different battery packs 11, thus helping to reduce the temperature difference between different individual cells 111 and ensuring the overall performance of the battery pack 10. Furthermore, in this embodiment, one heat exchange flow path 121 is arranged opposite to multiple individual cells 111 to synchronously adjust the operating temperature of each individual cell 111 in the battery pack 11 corresponding to the heat exchange flow path 121. Compared to designing different heat exchange paths 121 for each individual cell 111, this embodiment designs different heat exchange paths 121 for each battery pack 11. Each individual cell 111 in the same battery pack 11 exchanges heat with the same heat exchange path 121, which can reduce the number of heat exchange paths 121 and control elements 13 used, thereby simplifying the structure of the heat exchange assembly 12 and reducing cost and weight.

[0036] It should be noted that please refer to the following as well. Figure 6 The battery pack 10 has an intersecting first direction Z and a reference plane α. Specifically, the first direction Z and the reference plane α can be perpendicular to each other, and the angle between the first direction Z and the reference plane α can be 85° to 95°. The battery pack 11 and the heat exchange assembly 12 are stacked along the first direction Z. The fact that each heat exchange flow path 121 is arranged opposite to each individual cell 111 of the corresponding battery pack 11 should be understood as follows: the orthographic projection of each heat exchange flow path 121 on the reference plane α overlaps with the orthographic projection of each individual cell 111 of the corresponding battery pack 11 on the reference plane α.

[0037] In one embodiment, such as Figure 2 As shown, the battery pack 10 also has intersecting second direction X and third direction Y. The first direction Z, the second direction X, and the third direction Y intersect each other, specifically, the first direction Z, the second direction X, and the third direction Y can be perpendicular to each other, and the included angle between each pair of the first direction Z, the second direction X, and the third direction Y can be 85° to 95°, etc. At least two sets of battery packs 11 of the battery pack 10 are distributed along the second direction X.

[0038] like Figure 4 and Figure 6 As shown, each heat exchange flow path 121 includes at least two connected main flow segments 122. These at least two main flow segments 122 are distributed along a second direction X, and each main flow segment 122 extends along a third direction Y. Each main flow segment 122 of each heat exchange flow path 121 is respectively arranged opposite to different individual cells 111 of the corresponding battery pack 11. In other words, at least some individual cells 111 in each battery pack 11 are distributed along the second direction X. In each battery pack 11, different individual cells 111 in the second direction X are arranged opposite to different main flow segments 122 of the same heat exchange flow path 121. This embodiment, by rationally arranging the main flow segments 122 of the heat exchange flow path 121, makes the heat exchange flow path 121 match the arrangement of the battery pack 11 and its individual cells 111, thereby achieving temperature regulation of individual cells 111 at different positions within the battery pack 10, further refining the temperature difference control dimension, avoiding conflicts between the flow path layout of the heat exchange flow path 121 and the arrangement of the individual cells 111, and improving compatibility.

[0039] Furthermore, such as Figure 5 As shown, each battery pack 11 also includes at least two individual cells 111 distributed along the third direction Y. In this embodiment, the individual cells 111 in each battery pack 11 are arrayed along the second direction X and the third direction Y. Each main flow path 122 of the heat exchange flow path 121 is arranged opposite to at least two adjacent individual cells 111 in the third direction Y. In this embodiment, by reasonably arranging the main flow path 122 of the heat exchange flow path 121, the heat exchange flow path 121 is matched with the arrangement of the battery pack 11 and its individual cells 111, so as to realize the temperature regulation of individual cells 111 at different positions in the battery pack 10, further refine the temperature difference control dimension, avoid the flow path layout of the heat exchange flow path 121 from conflicting with the arrangement of individual cells 111, and improve compatibility.

[0040] In one embodiment, the heat exchange flow path 121 further includes a first connecting flow path section 123 and a second connecting flow path section 124. In the second direction X, the first connecting flow path section 123 is located between two adjacent main flow path sections 122, and is connected to both sides of the main flow path sections 122 via a second connecting flow path section 124. The first connecting flow path section 123 extends in the third direction Y. In two adjacent single-cell batteries 111 in the second direction X, the first connecting flow path section 123 is disposed opposite to at least one single-cell battery 111.

[0041] In this embodiment, based on the heat exchange flow path 121 including at least two main flow sections 122, a first connecting flow section 123 is added. The main flow section 122 and the first connecting flow section 123 of each heat exchange flow path 121 cooperate with the individual cells 111 of the corresponding battery pack 11 to exchange heat. This can increase the heat exchange area between the heat exchange flow path 121 and the individual cells 111 of the corresponding battery pack 11, improve the heat exchange efficiency, and further facilitate the flexible adjustment of the operating temperature of the individual cells 111 of different battery packs 11. This also helps to reduce the temperature difference between different individual cells 111, thereby ensuring the overall working performance of the battery pack 10.

[0042] For example, the battery pack 10 includes multiple battery groups 11, and the heat exchange assembly 12 includes multiple heat exchange flow paths 121, with each battery group 11 corresponding to a heat exchange flow path 121. Each battery group 11 includes four individual cells 111 distributed along the second direction X and the third direction Y. The heat exchange flow path 121 includes two main flow paths 122, which are spaced apart along the second direction X, and each main flow path 122 is positioned opposite to two different adjacent individual cells 111. A first connecting flow path 123 is arranged between the two main flow paths 122, and the first connecting flow path 123 is positioned opposite to two adjacent individual cells 111 in the second direction X.

[0043] Please refer to the following: Figure 7 , Figure 7 yes Figure 3 The diagram shows a structural schematic of the heat exchange component from another perspective.

[0044] In one embodiment, the heat exchange assembly 12 further includes a heat exchange plate 125, an inlet pipe 126, and an outlet pipe 127. The heat exchange plate 125 has at least two heat exchange flow paths 121 as described in the above embodiments. The inlet pipe 126 communicates with the at least two heat exchange flow paths 121, and the outlet pipe 127 communicates with the at least two heat exchange flow paths 121. Heat exchange fluid enters the heat exchange flow paths 121 from the inlet pipe 126, flows through the heat exchange flow paths 121 and exchanges heat with the individual battery cells 111, and then flows out from the outlet pipe 127, thus circulating continuously.

[0045] In this embodiment, the inlet pipe 126 and / or outlet pipe 127 are equipped with control elements 13. By reasonably setting the installation position of the control elements 13, this embodiment can not only ensure that the control elements 13 control the opening or closing of the corresponding heat exchange flow path 121, but also optimize the arrangement of the control elements 13. Furthermore, the control elements 13 are located outside the heat exchange plate 125 rather than inside the heat exchange plate 125, which facilitates maintenance and replacement.

[0046] Furthermore, the inlet pipe 126 includes an inlet main pipe 1261 and at least two inlet branch pipes 1262 connected to the inlet main pipe 1261. Each inlet branch pipe 1262 is connected to a corresponding heat exchange flow path 121, specifically, one inlet branch pipe 1262 may be connected to one heat exchange flow path 121, etc. The external heat exchange fluid first enters the inlet main pipe 1261, and then exits through the inlet main pipe 1261 and each inlet branch pipe 1262 to enter the corresponding heat exchange flow path 121. The outlet pipe 127 includes an outlet main pipe 1271 and at least two outlet branch pipes 1272 connected to the outlet main pipe 1271. Each outlet branch pipe 1272 is connected to a corresponding heat exchange flow path 121, specifically, one outlet branch pipe 1272 may be connected to one heat exchange flow path 121, etc. The heat exchange fluid in each heat exchange flow path 121 is output through the corresponding outflow branch pipe 1272, and then converges to the outflow main pipe 1271 for output. Each inflow branch pipe 1262 is provided with a control element 13, and / or each outflow branch pipe 1272 is provided with a control element 13.

[0047] In this embodiment, each inlet branch pipe 1262 and / or each outlet branch pipe 1272 is equipped with a control element 13, so that each heat exchange flow path 121 is equipped with a corresponding control element 13, thereby realizing independent control of each heat exchange flow path 121. This allows for flexible adjustment of the operating temperature of individual cells 111 in different battery packs 11, which helps to reduce the temperature difference between different individual cells 111 and thus ensures the overall working performance of the battery pack 10.

[0048] Figure 7 This example illustrates a scenario where the inlet pipe 126 is equipped with a control element 13. Specifically, each inlet branch pipe 1262 is equipped with a control element 13. This is for illustrative purposes only and does not limit the placement of the control element 13. Furthermore, in this embodiment, the height of the inlet pipe 126 is higher than the height of the outlet pipe 127, providing sufficient space in the inlet pipe 126 for arranging the control element 13. The control element 13 can be an electronic valve, such as a solenoid valve, and is not limited here.

[0049] In one embodiment, the individual battery cell 111 and the heat exchange plate 125 are stacked along a first direction Z. At least two inlet branch pipes 1262 are connected to one side of the heat exchange plate 125 in the first direction Z, and a main inlet pipe 1261 is connected to the side of the at least two inlet branch pipes 1262 away from the heat exchange plate 125. At least two outlet branch pipes 1272 are connected to one side of the heat exchange plate 125 in the first direction Z, and a main outlet pipe 1271 is connected to the side of the at least two outlet branch pipes 1272 away from the heat exchange plate 125.

[0050] Through the above-described method, this embodiment rationally arranges the inlet pipe 126 and the outlet pipe 127, with branch pipes (e.g., inlet branch pipe 1262 and outlet branch pipe 1272) and the main pipe (e.g., inlet main pipe 1261 and outlet main pipe 1271) concentrated on one side of the heat exchange plate 125. This reduces pipe crossings and bends, lowers fluid resistance, improves heat exchange efficiency, and saves internal space in the battery pack 10. Furthermore, the single-sided pipe connection facilitates the assembly and disassembly of the battery pack 10, making it particularly suitable for rapid assembly in mass production.

[0051] In one embodiment, the inlet pipe 126 and the outlet pipe 127 are respectively connected to opposite sides of the heat exchange plate 125. The heat exchange fluid enters and exits from opposite sides of the heat exchange plate 125, which can improve the utilization rate of the heat exchange area and make the temperature distribution in the battery pack 11 more uniform. Furthermore, the pipe layout on opposite sides reduces the short-circuiting phenomenon of the heat exchange fluid flowing directly from the inlet to the outlet, ensuring that the heat exchange fluid fully flows through all heat exchange flow paths 121 and maximizing the heat exchange effect.

[0052] In summary, this application provides a battery pack and an electrical device. The battery pack includes at least two battery groups, and each battery group includes at least two individual cells. The battery pack also includes a heat exchange assembly with at least two heat exchange flow paths. Each heat exchange flow path is positioned opposite to each individual cell in its corresponding battery group, and each heat exchange flow path is used to exchange heat with each individual cell in its corresponding battery group, ensuring that the individual cells maintain a reasonable operating temperature to guarantee performance. Furthermore, each heat exchange flow path is equipped with a corresponding control element, which controls the opening or closing of the corresponding heat exchange flow path, enabling independent control of each heat exchange flow path. This allows for flexible adjustment of the operating temperature of individual cells in different battery groups, thus reducing the temperature difference between different individual cells and ensuring the overall performance of the battery pack.

[0053] Furthermore, this application arranges one heat exchange flow path opposite to multiple individual cells to synchronously regulate the operating temperature of each individual cell in the battery pack corresponding to the heat exchange flow path. Compared to designing different heat exchange flow paths for each individual cell, this application designs different heat exchange flow paths for each battery pack, and each individual cell in the same battery pack exchanges heat with the same heat exchange flow path. This reduces the number of heat exchange flow paths and control components, thereby simplifying the structure of the heat exchange assembly and reducing cost and weight.

[0054] The battery pack and power device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, include: At least two battery packs, each of which includes at least two individual cells; as well as A heat exchange assembly includes at least two heat exchange flow paths, each of which is equipped with a corresponding control element. The heat exchange flow path is used to pass heat exchange fluid, and each of the control elements is used to control the opening or closing of the corresponding heat exchange flow path. Each heat exchange flow path is arranged opposite to each individual cell of the corresponding battery pack.

2. The battery pack according to claim 1, characterized in that, The battery pack has an intersecting first direction and a reference plane, and the battery pack and the heat exchange assembly are stacked along the first direction; The orthographic projection of each heat exchange flow path on the reference plane overlaps with the orthographic projection of each individual cell of the corresponding battery pack on the reference plane.

3. The battery pack according to claim 1, characterized in that, The battery pack has an intersecting second direction and a third direction, and the at least two battery packs are distributed along the second direction; Each heat exchange flow path includes at least two connected main flow segments, which are distributed along the second direction and each main flow segment extends along the third direction. Each main flow segment of each heat exchange flow path is respectively arranged opposite to different individual cells of the corresponding battery pack.

4. The battery pack according to claim 3, characterized in that, Each of the battery packs includes at least two individual cells distributed along the third direction, with the main road segment positioned opposite to at least two adjacent individual cells along the third direction.

5. The battery pack according to claim 3, characterized in that, Each of the battery packs includes at least two individual cells distributed along the second direction; The heat exchange flow path also includes a first connecting flow path section and a second connecting flow path section; In the second direction, the first connecting flow segment is located between two adjacent main flow segments, and the first connecting flow segment is connected to the main flow segments on both sides through a second connecting flow segment; The first connecting flow segment extends along the third direction; In two adjacent cells in the second direction, the first connecting flow path is disposed opposite to at least one cell.

6. The battery pack according to claim 1, characterized in that, The heat exchange assembly also includes: The heat exchange plate has at least two heat exchange flow paths formed inside it; The inlet pipe is connected to the at least two heat exchange flow paths; and The outflow pipe is connected to the at least two heat exchange flow paths; The control element is provided in the inlet pipe and / or the outlet pipe.

7. The battery pack according to claim 6, characterized in that, The inlet pipe includes an inlet main pipe and at least two inlet branch pipes connected to the inlet main pipe, and each inlet branch pipe is connected to a corresponding heat exchange flow path; the outlet pipe includes an outlet main pipe and at least two outlet branch pipes connected to the outlet main pipe, and each outlet branch pipe is connected to a corresponding heat exchange flow path. Each of the inlet branch pipes is provided with the control element, and / or each of the outlet branch pipes is provided with the control element.

8. The battery pack according to claim 7, characterized in that, The battery pack has a first direction, and the individual cells and the heat exchange plate are stacked along the first direction; at least two inlet branch pipes are connected to one side of the heat exchange plate in the first direction, and the main inlet pipe is connected to the side of the at least two inlet branch pipes away from the heat exchange plate; at least two outlet branch pipes are connected to one side of the heat exchange plate in the first direction, and the main outlet pipe is connected to the side of the at least two outlet branch pipes away from the heat exchange plate.

9. The battery pack according to claim 6, characterized in that, The inlet pipe and the outlet pipe are respectively connected to opposite sides of the heat exchange plate.

10. An electrical device, characterized in that, The device includes a battery pack as described in any one of claims 1 to 9, wherein the battery pack is a power supply for the electrical device.

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