Vapor chamber and battery pack

Abstract

The utility model relates to battery technical field, discloses a vapor chamber and battery pack, vapor chamber has first main runner, second main runner and two groups of branch runner, the length of first main runner extends along the first direction, the length of second main runner extends along the second direction, the first direction intersects with the second direction, the two groups of sub-runners are respectively arranged on two sides of the second main runner along the width direction, each group of sub-runners comprises a plurality of sub-runners arranged at intervals, one ends of the sub-runners along the length direction are communicated with the first main runner, and the other ends of the sub-runners are communicated with the second main runner; the first main runner is provided with a first water inlet and outlet located between the two sets of branch runners, and the second main runner is provided with a second water inlet and outlet located in the end, in the second direction, of the second main runner. When the water inlet and outlet states of the first water inlet and outlet and the second water inlet and outlet of the temperature equalizing plate are exchanged, the temperature equalizing effect of the battery pack cannot be influenced, and the mounting requirements of various vehicle types can be met.

Description

Heat spreader and battery pack Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a heat spreader and a battery pack including the heat spreader. Background Technology

[0002] Pure electric vehicles are the mainstream in the current market. During the development of battery packs and in market applications, customers have proposed the idea of ​​matching the same battery pack with multiple models, that is, the inlet and outlet of the liquid temperature equalization plate of the battery pack can be interchanged. However, due to the inconsistency of the inlet and outlet positions of pure electric vehicles and the complexity and uniqueness of the flow channel design of traditional liquid temperature equalization plates, the interchange of inlet and outlet has affected the thermal performance indicators, thus failing to meet the temperature equalization requirements. Summary of the Invention

[0003] The purpose of this utility model embodiment is to provide a heat spreader and battery pack with a simple flow channel structure. Without affecting the heat spreader effect of the battery pack, the water inlet and outlet states of the first and second water inlets and outlets can be interchanged to meet the installation requirements of multiple vehicle models.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, a heat spreader is provided, the heat spreader having a first main channel, a second main channel, and two sets of branch channels. The length of the first main channel extends along a first direction, and the length of the second main channel extends along a second direction. The first direction and the second direction intersect. The two sets of branch channels are respectively arranged on both sides of the second main channel along its width direction. Each set of branch channels includes multiple spaced sub-channels. One end of each sub-channel along its length direction is connected to the first main channel, and the other end is connected to the second main channel. The first main channel has a first inlet and outlet located between the two sets of branch channels. The second main channel has a second inlet and outlet located at one end of the second main channel along the second direction.

[0006] As a further embodiment of the heat spreader, the two sets of branch channels are symmetrical with respect to the second main channel, and the first main channel is symmetrical with respect to the second main channel.

[0007] As a further embodiment of the heat spreader, the first direction is perpendicular to the second direction, and the sub-channels include a first channel extending along the first direction and a second channel extending along the second direction. The first channel and the second channel are connected. The end of the first channel away from the second channel is connected to the second main channel. The end of the second channel away from the first channel is connected to the first main channel. All the first channels are arranged along the second direction, and all the second channels are arranged along the first direction.

[0008] As a further embodiment of the heat spreader, the first inlet and outlet are located at the center of the first main channel along its length, and the second inlet and outlet are located at the end of the second main channel near the first inlet and outlet.

[0009] As a further embodiment of the heat spreader, in each group of two adjacent second channels of the sub-channels, along the first direction, the width of the second channel closer to the second main channel is smaller than the width of the second channel farther from the second main channel, and the width of the first channel of the same sub-channel is equal to the width of the second channel.

[0010] As a further embodiment of the heat spreader, along the first direction, the width of all the second channels in each group of the branch channels increases arithmetically in a direction away from the second main channel.

[0011] As a further embodiment of the heat spreader, along the first direction, the width of the second flow channel of each group of the distribution channels increases arithmetically with a difference of 1.5-2.5 mm.

[0012] As a further embodiment of the heat spreader, the width of the first main channel and the width of the second main channel are 40-60mm, and the width of the sub-channel is 14-30mm.

[0013] As a further embodiment of the heat exchanger, the first inlet and outlet and the second inlet and outlet are located on the same side of the heat exchanger along its thickness direction.

[0014] As a further embodiment of the heat spreader, the distance between two adjacent sub-channels in each group of the distribution channels is 15-25mm.

[0015] As a further embodiment of the heat spreader, each of the sub-channels is equipped with a regulating valve for adjusting the flow rate.

[0016] On the other hand, a battery pack is provided, including a battery module and the aforementioned heat spreader, the heat spreader being located on the side of the battery module.

[0017] Beneficial effects: This utility model designs two main channels, one of which can be used as an inlet channel and the other as an outlet channel. The two main channels are not directly connected, but are connected by a branch channel composed of multiple sub-channels located on both sides of the second main channel. The first inlet and outlet on the first main channel are located between the two branch channels, and the second inlet and outlet on the second main channel are located at one end of the second main channel along its length. With this structural design, the temperature uniformity effect will not be affected when the inlet and outlet states of the first and second inlet and outlet are switched. This allows multiple vehicle models to share a battery module containing the temperature uniform plate.

[0018] This invention designs the width of the sub-channels according to the position of the sub-channels, the order in which the fluid enters each sub-channel, and the contact area between each sub-channel and the battery cell. The width of the sub-channels gradually increases towards the edge along the second direction to optimize the heat exchange area between the sub-channels and the battery cell in each region and ensure the uniform temperature effect of the battery pack.

[0019] This invention designs the sub-channel as an L-shaped structure. On the one hand, it can reduce flow resistance. To some extent, new energy vehicles can achieve the same head using water pumps with smaller head, thus reducing the cost of new energy vehicles. On the other hand, the L-shaped sub-channel structure is simple and easy to process and form. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Figure 1 is a bottom view of the heat exchange plate according to an embodiment of the present invention;

[0022] Figure 2 is an exploded view of the temperature distribution plate described in an embodiment of this utility model;

[0023] Figure 3 is a perspective view of the heat exchange plate described in an embodiment of this utility model;

[0024] Figure 4 is a simulation cloud diagram of the flow resistance of the heat exchange plate described in the embodiment of this utility model;

[0025] Figure 5 is a simulation cloud diagram of the flow velocity of the heat exchange plate described in the embodiment of this utility model.

[0026] In the picture:

[0027] 101. Substrate; 102. Flow channel plate; 1021. First groove; 1022. Second groove; 1023. Third groove; 100. First main flow channel; 200. Second main flow channel; 300. Branch flow channel; 310. Sub-flow channel; 311. First flow channel; 312. Second flow channel; 400. First inlet / outlet; 500. Second inlet / outlet; 600. Regulating valve. Detailed Implementation

[0028] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0032] As shown in Figures 1 to 3, the heat spreader of this embodiment of the present invention has a first main channel 100, a second main channel 200, and two sets of flow channels 300. The length of the first main channel 100 extends along a first direction, and the length of the second main channel 200 extends along a second direction. The first direction and the second direction intersect. The two sets of flow channels 300 are respectively arranged on both sides of the second main channel 200 along its width direction. Each set of flow channels 300 includes a plurality of spaced sub-flow channels 310. One end of the sub-flow channel 310 along its length direction is connected to the first main channel 100, and the other end is connected to the second main channel 200. The first main channel 100 has a first inlet and outlet 400 located between the two sets of flow channels 300. The second main channel 200 has a second inlet and outlet 500 located at one end of the second main channel 200 along the second direction.

[0033] This embodiment features two main channels, one serving as the inlet channel and the other as the outlet channel. The first main channel 100 is not directly connected to the second main channel 200, but rather connected via branch channels 300, composed of multiple sub-channels 310 on both sides of the second main channel 200, to achieve temperature uniformity. Specifically, the first inlet / outlet 400 on the first main channel 100 serves as the inlet, and the second inlet / outlet 500 on the second main channel 200 serves as the outlet. Fluid in the first main channel 100 flows into the second main channel 200 through the branch channels 300, exits through the second inlet / outlet 500, and then circulates back into the first main channel 100 via an external power source, resulting in excellent temperature uniformity. For the temperature equalization plate in this embodiment, the water inlet and outlet states of the first inlet / outlet 400 and the second inlet / outlet 500 can be changed according to the model of the new energy vehicle. That is, the first inlet / outlet 400 on the first main channel 100 is used as the outlet, and the second inlet / outlet 500 on the second main channel 200 is used as the inlet. The fluid in the second main channel 200 flows into the first main channel 100 through the diversion channel 300, flows out through the first inlet / outlet 400, and then flows back into the second main channel 200 through an external power device such as a water pump. It also has a good temperature equalization effect.

[0034] This embodiment simplifies the flow channel structure of the heat spreader, reduces the design and manufacturing difficulty of the heat spreader, and allows the sub-flow channels 310 to be relatively evenly arranged on both sides of the second main flow channel 200 as needed, thereby improving heat dissipation uniformity. In this embodiment, the water inlet and outlet states of the first inlet / outlet 400 and the second inlet / outlet 500 can be changed according to the new energy vehicle model without affecting the heat spreader effect, enabling multiple vehicle models to share a battery module containing the heat spreader.

[0035] In this embodiment, the first main channel 100 can be disposed in the edge region of the heat spreader. The length direction of the first main channel 100 is the first direction, which can be a straight line. In other embodiments, the first direction can also be the extension direction of a curve (not shown in the figure). For the second main channel 200, its length direction is the second direction, which can be a straight line. In other embodiments, the second direction can also be the extension direction of another curve. The first direction and the second direction intersect (the first main channel 100 and the second main channel 200 do not intersect, only their extension directions intersect).

[0036] Furthermore, the two-component flow channels 300 are symmetrical with respect to the second main flow channel 200, and the first main flow channel 100 is symmetrical with respect to the second main flow channel 200. That is, the second main flow channel 200 can be used as the axis of symmetry of the two-component flow channels 300 and the axis of symmetry of the first main flow channel 100. The second main flow channel 200 is located at the center line of the heat spreader along the first direction. Through this symmetrical structural design, the heat spreader effect of the flow channel structure on both sides of the second main flow channel 200 can be made consistent.

[0037] The following description will further illustrate the structure of the heat exchange plate of this utility model, taking the first main channel 100 located in the edge area of ​​the heat exchange plate as an example.

[0038] As shown in Figures 1 to 3, the first direction (X direction in the figure) is perpendicular to the second direction (Y direction in the figure). The sub-channel 310 includes a first channel 311 extending along the first direction and a second channel 312 extending along the second direction. The first channel 311 and the second channel 312 are connected. The end of the first channel 311 away from the second channel 312 is connected to the second main channel 200. The end of the second channel 312 away from the first channel 311 is connected to the first main channel 100. All the first channels 311 are arranged along the second direction, and all the second channels 312 are arranged along the first direction.

[0039] In this embodiment, the sub-channel 310 has an L-shaped structure. By designing the first channel 311 to be perpendicular to the second main channel 200 and the second channel 312 to be perpendicular to the first main channel 100, when the inlet and outlet states of the first inlet / outlet 400 and the second inlet / outlet 500 are switched, the flow resistance of the fluid in the first main channel 100 entering the second channel 312 is basically the same as the flow resistance of the fluid in the second main channel 200 entering the first channel 311. The flow resistance of the fluid in the second channel 312 entering the first main channel 100 is also basically the same as the flow resistance of the fluid in the first channel 311 entering the second main channel 200. Therefore, when the inlet and outlet states of the first inlet / outlet 400 and the second inlet / outlet 500 are switched, the temperature equalization effect of the heat equalization plate will not be affected.

[0040] In this embodiment, by designing the sub-flow channel 310 as an L-shaped structure, on the one hand, the flow resistance can be reduced, which to some extent can reduce the pump head of new energy vehicles, that is, a water pump with a smaller head can be used, thus achieving the goal of cost reduction for new energy vehicles; on the other hand, the L-shaped sub-flow channel 310 has a simple structure and is easy to process and form.

[0041] For example, the heat spreader is rectangular and includes a substrate 101 and a flow channel plate 102 fixed to one side of the substrate 101 along its thickness direction. The flow channel plate 102 has a first groove 1021 corresponding to the first main flow channel 100, a second groove 1022 corresponding to the second main flow channel 200, and two sets of third grooves 1023 corresponding to the two sets of flow channels 300, all recessed in a direction away from the substrate 101. The first groove 1021 and the substrate 101 surround the first main flow channel 100, the second groove 1022 and the substrate 101 surround the second main flow channel 200, and the third groove 1023 and the substrate 101 surround the two sets of flow channels 300. The flow channel plate 102 is formed by stamping and welded to the substrate 101.

[0042] Furthermore, the first inlet / outlet 400 is located at the center of the first main channel 100 along its length, and the second inlet / outlet 500 is located at the end of the second main channel 200 near the first inlet / outlet 400.

[0043] Taking the first inlet / outlet 400 as the inlet and the second inlet / outlet 500 as the outlet as an example, this embodiment designs the first inlet / outlet 400 at the center of the first main channel 100 along its length, so that the first main channel 100 can enter each second channel 312 sequentially from the center to both ends along the first direction, ensuring that the temperature uniformity of the channel structure on both sides of the second main channel 200 is consistent; in this embodiment, the second inlet / outlet 500 is designed at the end of the second main channel 200 close to the first inlet / outlet 400, so that the fluid can flow through the entire second main channel 200, thereby improving the temperature uniformity.

[0044] In other embodiments, the second inlet / outlet 500 may also be located at the end of the second main channel 200 away from the first inlet / outlet 400. In this case, the lengths of the first channel 311 and the second channel 312 of the sub-channel 310 can be adjusted according to the actual situation, which will not be elaborated further.

[0045] Regarding the L-shaped structure of the sub-channel 310, this application provides a flow resistance simulation cloud diagram as shown in Figure 4 and a flow velocity simulation cloud diagram as shown in Figure 5. As can be seen from the figures, the standardized and simplified flow channel has low flow resistance and good performance. In practical applications, it can reduce battery energy consumption, achieving cost reduction to a certain extent and meeting the requirements of simple design and high performance, which is a positive development for new energy vehicles.

[0046] Of course, the heat spreader in this embodiment is not limited to a rectangular structure, but can also be circular, regular hexagonal, etc. The shape of the sub-channel 310 is not limited to L-shape, but can also be a V-shaped structure with an included angle greater than 90° or less than 90°, or can be designed as an arc-shaped structure (not shown in the figure). In other specific embodiments, the shape of the heat spreader and the shape of the sub-channel 310 can be designed according to actual needs so that the heat spreader has a good temperature uniformity effect on the battery pack. The specific details will not be elaborated further.

[0047] In a preferred embodiment, the second inlet / outlet 500 is adjacent to the first inlet / outlet 400. When the battery pack is installed, if the inlet / outlet state of the first inlet / outlet 400 and the second inlet / outlet 500 needs to be changed due to changes in vehicle model, the flow resistance of the flow channel and the thermal performance of the entire heat exchange plate remain basically unchanged before and after the change.

[0048] Furthermore, in each group of flow channels 300, among two adjacent second flow channels 312, along the first direction, the width of the second flow channel 312 closer to the second main flow channel 200 is smaller than the width of the second flow channel 312 farther from the second main flow channel 200, and the width of the first flow channel 311 of the same sub-flow channel 310 is equal to the width of the second flow channel 312.

[0049] In existing vapor chamber technologies, fluid mainly concentrates in the central region, resulting in significantly better temperature uniformity in the central area compared to the edge regions, leading to poor overall temperature uniformity. This is especially true for non-axisymmetric flow channels, where high-temperature and low-temperature zones emerge. When the inlet and outlet states are interchanged, these zones alternate, affecting the stability of the battery module's temperature uniformity. The overall heat dissipation of the battery module is consistent. In this embodiment, if the width of each sub-channel is designed to be uniform, the fluid will preferentially enter the central sub-channels after entering the main flow channel. This will result in better temperature uniformity in the central region of the battery module compared to the edge regions. Furthermore, since the sub-channels closer to the edge are longer, increased flow resistance affects the flow rate, ultimately leading to poorer temperature uniformity in the battery module.

[0050] In this embodiment, based on the position and length of the sub-channels 310, the order in which fluid enters each sub-channel 310, and the contact area between the sub-channels 310 and the battery cells, all the second channels 312 of each group of sub-channels 300 are designed to increase sequentially along the first direction towards the edge of the heat spreader. By increasing the inlet cross-sectional area of ​​the sub-channels 310 in the edge region, the flow resistance of the sub-channels 310 is reduced, and the flow rate of the sub-channels 310 in the edge region is rationally controlled. That is, the sub-channels 310 closer to the edge are wider and longer, and the number of battery cells in contact with the sub-channels 310 increases. Correspondingly, the contact area between the sub-channels 310 and the battery cells also increases, ultimately improving the heat spreader effect without the need to add a guide plate.

[0051] In a preferred embodiment, along the first direction, the width of all the second channels 312 of each group of flow channels 300 increases arithmetically in a direction away from the second main flow channel 200, that is, the width of each sub-channel 310 increases arithmetically in order to optimize the temperature uniformity effect of the heat spreader structure on the battery pack.

[0052] Furthermore, along the first direction, the width of all the second channels 312 of each group of flow channels 300 increases arithmetically with a difference of 1.5-2.5 mm, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm or 2.5 mm, in order to further optimize the contact area between each sub-flow channel 310 and the battery cell, so that the heat exchange efficiency between each sub-flow channel 310 and the battery cell is the same.

[0053] More preferably, the width of all the second channels 312 of each group of flow channels 300 increases arithmetically with a difference of 2mm, which can maximize the contact area between the L-shaped sub-flow channels 310 and the battery cell, thereby optimizing the temperature uniformity of the battery pack by the heat spreader structure.

[0054] In this embodiment, the width of the sub-channel 310 is smaller than the width of the first main channel 100, and the width of the sub-channel 310 is smaller than the width of the second main channel 200. When the fluid in the main channel enters each sub-channel 310, the flow resistance can be reduced.

[0055] In this embodiment, the width of the first main channel 100 and the width of the second main channel 200 are 40-60mm respectively, and the width of the sub-channel 310 is 14-30mm, which can ensure sufficient fluid flow when entering each sub-channel 310 from the main channel.

[0056] Taking the first direction as an example, the design is based on an equal difference of 2mm. In each group of flow channels 300, the width of the second flow channel 312 of the sub-flow channel 310 closest to the second main flow channel 200 is 14mm, the width of the second flow channel 312 of the other sub-flow channel 310 adjacent to the sub-flow channel 310 is 16mm, and so on.

[0057] In this embodiment, in order to facilitate the battery packaging vehicle and to ensure that the heat spreader is in close contact with the battery cell, the first water inlet / outlet 400 and the second water inlet / outlet 500 are located on the same side of the heat spreader along its thickness direction.

[0058] Furthermore, the distance between two adjacent sub-channels 310 in each group of flow channels 300 is 15-25mm, such as 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm or 25mm, specifically designed according to the size of the heat spreader and the specifications of the sub-channels 310, so that the sub-channels 310 have sufficient contact area with the battery cell and improve the temperature uniformity effect.

[0059] Furthermore, a regulating valve 600 for adjusting the flow rate is installed on each sub-channel 310. Since the contact area between the channel and the battery cell is fixed after the channel design, this embodiment installs a regulating valve 600 on each sub-channel 310. The regulating valve 600 can be connected to a controller, which can control the fluid flow rate of each sub-channel 310 according to the heat status of the battery pack, thereby reducing energy consumption. In practical applications, the opening degree of the regulating valves 600 on the two symmetrical sub-channels 310 is the same, that is, the flow rate of the two symmetrical sub-channels 310 is the same.

[0060] The installation structure of the regulating valve 600 on the flow channel is existing technology. For example, a sealing sleeve is installed on the sub-flow channel 310, the regulating valve 600 is installed inside the sealing sleeve, and a drive component for adjusting the regulating valve 600 is provided on the sealing sleeve. The drive component controls the opening of the regulating valve 600 to adjust the flow rate of the liquid in the sub-flow channel 310, etc. The details will not be elaborated further.

[0061] The simplicity, adjustability, and uniqueness of the flow channels in this embodiment can meet the needs of different projects. Simply increase or decrease the number and width of the flow channels according to the size of different battery packs and the area size of the battery modules to match the project and meet customer requirements.

[0062] This embodiment also provides a battery pack, including a battery module and a heat spreader located on the side of the battery module. The heat spreader is any of the heat spreaders described in the above embodiments. In this embodiment, the water inlet and outlet conditions of the two water inlets and outlets on the heat spreader can be changed according to the vehicle model, and the heat spreader performance of the battery pack will not be affected by changing the water inlet and outlet. The battery pack of this embodiment can be used by multiple vehicle models.

[0063] Optionally, there can be one or two heat spreaders. Preferably, a heat spreader is provided on each of the two opposite sides of the battery module, and the two inlet and outlet ports of each heat spreader are located on the side of the heat spreader away from the battery module.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vapor chamber, characterized by, The temperature distribution plate has a first main channel, a second main channel, and two sets of branch channels. The length of the first main channel extends along a first direction, and the length of the second main channel extends along a second direction. The first direction and the second direction intersect. The two sets of branch channels are respectively arranged on both sides of the second main channel along its width direction. Each set of branch channels includes multiple spaced sub-channels. One end of each sub-channel along its length direction is connected to the first main channel, and the other end is connected to the second main channel. The first main channel has a first inlet and outlet located between the two sets of branch channels. The second main channel has a second inlet and outlet located at one end of the second main channel along the second direction.

2. The vapor chamber of claim 1, wherein, The two sets of branch channels are symmetrical with respect to the second main channel, and the first main channel is symmetrical with respect to the second main channel.

3. The vapor chamber of claim 2, wherein, The first direction is perpendicular to the second direction. The sub-channel includes a first channel extending along the first direction and a second channel extending along the second direction. The first channel and the second channel are connected. The end of the first channel away from the second channel is connected to the second main channel. The end of the second channel away from the first channel is connected to the first main channel. All the first channels are arranged along the second direction, and all the second channels are arranged along the first direction.

4. The vapor chamber of claim 3, wherein, The first inlet and outlet are located at the center of the first main channel along its length, and the second inlet and outlet are located at the end of the second main channel near the first inlet and outlet.

5. The vapor chamber of claim 3, wherein, In each group of the sub-channels, among two adjacent second channels, along the first direction, the width of the second channel closer to the second main channel is smaller than the width of the second channel farther from the second main channel, and the width of the first channel of the same sub-channel is equal to the width of the second channel.

6. The vapor chamber of claim 4, wherein, Along the first direction, the width of all the second channels in each group of the branch channels increases arithmetically in a direction away from the second main channel.

7. The vapor chamber of claim 6, wherein, Along the first direction, the width of the second flow channel in each group of the branch channels increases arithmetically with a difference of 1.5-2.5 mm.

8. The vapor chamber according to any one of claims 1 to 7, wherein The widths of the first and second main channels are 40-60 mm, and the width of the sub-channels is 14-30 mm.

9. The vapor chamber according to any one of claims 1 to 7, wherein The distance between two adjacent sub-channels in each group of flow channels is 15-25mm.

10. A battery pack, characterized by, It includes a battery module and a heat spreader as described in any one of claims 1 to 9, wherein the heat spreader is located on the side of the battery module.

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