Liquid cooling plate and battery pack

Abstract

The utility model provides a liquid cooling plate and a battery pack, the liquid cooling plate comprises a plate body, and the plate body is internally provided with a first cooling channel, a second cooling channel, a first confluence channel, a connecting channel and a first diffusion channel. A plurality of first cooling channels and a plurality of second cooling channels are arranged, a water inlet is formed in one end of each first cooling channel, the other end of each first cooling channel is communicated with the first confluence channel, a water outlet is formed in one end of each second cooling channel, and the other end of each second cooling channel is communicated with the first diffusion channel. The connecting channel is provided with a first water passing opening and a second water passing opening, the first water passing opening is communicated with the first confluence channel, and the second water passing opening is communicated with the flow dispersing channel. In the arrangement direction of the multiple second cooling channels, the second water passing opening is provided with a first flow dispersing side and a second flow dispersing side which are opposite, and the arrangement number of the second cooling channels on the first flow dispersing side is the same as that of the second cooling channels on the second flow dispersing side. The liquid cooling plate provided by the utility model can solve the technical problem that the heat dissipation of the existing liquid cooling plate on the battery is not uniform enough.

Description

Technical Field

[0001] The present application relates to the field of battery cooling technology, and in particular to a liquid cooling plate and a battery pack. Background Art

[0002] With the development of science and technology, the capacity and power of power batteries are getting larger and larger. During the charging and discharging process of high-power batteries, the batteries will generate a lot of heat, which will cause the temperature of the batteries to rise and affect the performance of the batteries. In this regard, the existing technology mainly uses liquid cooling plates to cool the batteries to keep the batteries within a suitable temperature range.

[0003] However, the cooling channel in the existing liquid cooling plate mainly extends in an S shape (or a bow shape) between the water inlet and the water outlet. The coolant flows from the water inlet through each battery cell and flows all the way to the water outlet. This causes the flow path of the coolant to be too long. The closer the coolant is to the water outlet, the higher its temperature is, and the weaker its heat absorption capacity for the battery is. This leads to a large temperature difference between the battery cells near the water inlet and the battery cells near the water outlet, affecting the performance of the entire battery. Utility Model Content

[0004] The embodiment of the present application provides a liquid cooling plate to solve the technical problem that the existing liquid cooling plate does not dissipate heat uniformly to the battery.

[0005] To achieve the above-mentioned purpose, the liquid cooling plate proposed in the present application includes a plate body, in which a first cooling channel, a second cooling channel, a first confluence channel, a connecting channel and a first diffuser channel are provided. There are multiple first cooling channels, each of which has a water inlet formed at one end and is connected to the first confluence channel at the other end; there are multiple second cooling channels, each of which has a water outlet formed at one end and is connected to the first diffuser channel at the other end. The connecting channel is provided with a first water port and a second water port, the first water port is connected to the first confluence channel, and the second water port is connected to the diffuser channel; wherein, in the arrangement direction of the multiple second cooling channels, the second water port has a first diffuser side and a second diffuser side opposite to each other, and the number of the second cooling channels arranged on the first diffuser side is the same as the number of the second cooling channels arranged on the second diffuser side.

[0006] Optionally, in one embodiment, in the arrangement direction of the plurality of first cooling channels, the first water outlet has a first confluence side and a second confluence side relative to each other, and the arrangement number of the first cooling channels on the first confluence side is the same as the arrangement number on the second confluence side.

[0007] Optionally, in one embodiment, the connecting channel is located on one side of the first converging channel and the first diffuser channel along the thickness direction of the plate body; or, the connecting channel is located on the side of the first converging channel and the first diffuser channel away from the first cooling channel and the second cooling channel.

[0008] Optionally, in one embodiment, the plate body includes a cooling plate body and a first guide plate body connected to one end of the cooling plate body; the cooling plate body is provided with the first cooling channel and the second cooling channel; the interior of the first guide plate body is hollow and is provided with a first partition, the first partition extends along the length direction of the first guide plate body, and the first partition divides the internal space of the first guide plate into the connecting channel and the first convergence channel; a first partition block is also provided in the convergence channel, and the first partition block divides the first convergence channel into the first convergence channel and the first diffusion channel; the first partition is also provided with the first water outlet and the second water outlet.

[0009] Optionally, in one embodiment, the plate body also includes a second guide plate body, and the first guide plate body and the second guide plate body are respectively connected to the two ends of the cooling plate body; the interior of the second guide plate body is hollow and is provided with a second partition block, and the second partition block divides the internal space of the second guide plate body into a second converging channel and a second diffuser channel; multiple first cooling channels are connected to the second diffuser channel, and the second guide plate body is provided with a total water inlet connected to the second diffuser channel; multiple second cooling channels are connected to the second converging channel, and the second guide plate body is provided with a total water outlet connected to the second converging channel.

[0010] Optionally, in one embodiment, a second partition is further provided in the second guide plate body, the second partition extends along the length direction of the second guide plate body, and the second partition divides the internal space of the second guide plate into an idle channel and a second convergence channel; the second partition block is provided in the second convergence channel, and the second partition block divides the second convergence channel into the second convergence channel and the second diffuser channel.

[0011] Optionally, in one embodiment, the cooling plate body includes a first cooling plate body and a second cooling plate body, the first cooling plate body is provided with a plurality of the first cooling channels, and the second cooling plate body is provided with a plurality of the second cooling channels; the first cooling channels and the second cooling channels both extend along the length direction of the plate body, and the first cooling plate body and the second cooling plate body are spliced ​​with each other along the width direction of the plate body.

[0012] Optionally, in one embodiment, the first guide plate body, the second guide plate body, the first cooling plate body and the second cooling plate body are all provided with enclosures, and a plurality of the enclosures are combined to form an installation groove, and the installation groove is used to install a battery module.

[0013] Optionally, in one embodiment, the number of the first cooling channels and the number of the second cooling channels are set to be the same; and / or the cross-sections of the first cooling channels and the second cooling channels are rectangular.

[0014] The present application also proposes a battery pack, which includes a battery module and the liquid cooling plate described in any one of the above embodiments, and the battery module is installed on the liquid cooling plate.

[0015] When the liquid cooling plate provided by the present application is in use, the coolant flows into the multiple first cooling channels respectively through the multiple water inlets, and in the process of flowing in the first cooling channels, the coolant can absorb heat and cool the battery cells passing through, and the coolant in the multiple first cooling channels will finally converge into the first confluence channel.

[0016] Because the first converging channel is connected to the connecting channel through the first water opening, and the connecting channel is connected to the first diffuser channel through the second water opening, after the coolant is gathered in the first converging channel, it will flow into the connecting channel through the first water opening, and then flow into the first diffuser channel through the second water opening.

[0017] Because one end of the multiple second cooling channels forms a water outlet and the other end is connected to the first diffuser channel, the coolant flowing into the first diffuser channel will be dispersed and flow into the multiple second cooling channels. In the process of the coolant flowing in the second cooling channels, the coolant can absorb heat and cool the battery cells passing through. The coolant in the multiple first cooling channels finally flows out through the multiple water outlets.

[0018] Therefore, it can be understood that the liquid cooling plate of the present application can make the flow path of the coolant between the water inlet and the water outlet approximately U-shaped by setting the first confluence channel, the connecting channel and the first diffusion channel. This can reduce the flow distance of the coolant between the water inlet and the water outlet, so that each battery cell can be more evenly absorbed and cooled, thereby reducing the temperature difference between the battery cells and improving the performance of the entire battery.

[0019] In addition, because the number of second cooling channels arranged on the first diffuser side and the number of second cooling channels arranged on the second diffuser side are set to be the same, the coolant in the first diffuser channel can flow evenly into each second cooling channel, avoiding a large difference in coolant flow in each second cooling channel, thereby causing a large temperature difference between battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of an embodiment of a liquid cooling plate of the present application;

[0022] Figure 2 This is a structural explosion diagram of an embodiment of a liquid cooling plate of the present application;

[0023] Figure 3 This is a structural schematic diagram of an embodiment of a first cooling plate in the liquid cooling plate of the present application;

[0024] Figure 4 This is a structural schematic diagram of an embodiment of a second cooling plate in the liquid cooling plate of the present application;

[0025] Figure 5 A structural cross-sectional view of an embodiment of a first guide plate in a liquid cooling plate of the present application;

[0026] Figure 6 This is a structural cross-sectional view of an embodiment of a second guide plate in a liquid cooling plate of the present application;

[0027] Figure 7 This is a structural explosion diagram of a battery pack according to an embodiment of the present application.

[0028] Description of Figure Numbers:

[0029]

[0030]

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] An embodiment of the present application provides a liquid cooling plate to solve the problem that the existing liquid cooling plate does not dissipate heat uniformly for the battery, which will be described below in conjunction with the accompanying drawings.

[0034] In the embodiments of the present application, Figures 1 to 6 As shown, the liquid cooling plate 100 includes a plate body 10 , the shape of the plate body 10 is approximately a rectangular parallelepiped, and the plate body 10 is hollow and has a first cooling channel 110 , a second cooling channel 120 , a first converging channel 121 , a connecting channel 122 and a first diffusing channel 123 .

[0035] Among them, Figure 3 As shown, there are multiple first cooling channels 110, and the multiple first cooling channels 110 are arranged along the width direction of the plate body 10, and each first cooling channel 110 extends along the length direction of the plate body 10. Figure 2 , Figure 3 and Figure 5 Each first cooling channel 110 has a water inlet 101 formed at one end and is connected to a first confluence channel 121 at the other end. Each water inlet 101 can be connected to a water inlet pipe or connected to the side wall of the same water inlet pipe; the first confluence channel 121 is located at one end of the plate body 10 in the length direction, and the first confluence channel 121 extends along the width direction of the plate body 10, and the plurality of first cooling channels 110 are connected to the side wall of the first confluence channel 121.

[0036] like Figure 4 As shown, there are multiple second cooling channels 120, and the multiple second cooling channels 120 are also arranged along the width direction of the plate body 10, and each second cooling channel 120 also extends along the length direction of the plate body 10. Figure 2 , Figure 4 and Figure 5 Each second cooling channel 120 has a water outlet 102 formed at one end and is connected to the diffuser channel at the other end. Each water outlet 102 can be connected to a water outlet pipe or to the side wall of the same water inlet pipe; the first diffuser channel 123 is located at one end of the plate body 10 in the length direction and is located on one side of the first converging channel 121, and the first diffuser channel 123 extends along the width direction of the plate body 10, and the plurality of first cooling channels 110 are connected to the side wall of the first converging channel 121.

[0037] The first converging channel 121 and the first diffusing channel 123 are connected mainly through the connecting channel 122. Specifically, Figure 5 As shown, the connecting channel 122 is also located at one end in the length direction of the plate body 10, and the connecting channel 122 is provided with a first water opening 201 and a second water opening 202, the first water opening 201 is connected to the first confluence channel 121, and the second water opening 202 is connected to the diffuse flow channel, so that the first confluence channel 121 and the first diffuse flow channel 123 can be connected to each other.

[0038] When using, please combine Figures 1 to 6The coolant flows into the multiple first cooling channels 110 through the multiple water inlets 101 respectively, and in the process of flowing in the first cooling channels 110, the coolant can absorb heat and cool the battery cells 211 passing through. The coolant in the multiple first cooling channels 110 will finally converge into the first confluence channel 121.

[0039] Because the first converging channel 121 is connected to the connecting channel 122 through the first water opening 201, and the connecting channel 122 is connected to the first diffuser channel 123 through the second water opening 202, after the coolant is gathered into the first converging channel 121, it will flow into the connecting channel 122 through the first water opening 201, and then flow into the first diffuser channel 123 through the second water opening 202.

[0040] Because one end of the multiple second cooling channels 120 forms a water outlet 102 and the other end is connected to the first diffusion channel 123, the coolant flowing into the first diffusion channel 123 will be dispersed and flow into the multiple second cooling channels 120, and in the process of the coolant flowing in the second cooling channels 120, it can absorb heat and cool the battery cells 211 passing through, and the coolant in the multiple first cooling channels 110 finally flows out through the multiple water outlets 102.

[0041] Therefore, it can be understood that the liquid cooling plate 100 of the present application can make the flow path of the coolant between the water inlet 101 and the water outlet 102 approximately U-shaped by setting the first confluence channel 121, the connecting channel 122 and the first diffusion channel 123. This can reduce the flow distance of the coolant between the water inlet 101 and the water outlet 102, so that each battery cell 211 can be more evenly absorbed and cooled, thereby reducing the temperature difference between the battery cells 211 and improving the performance of the entire battery.

[0042] In addition, in this application, reference may be made to Figure 5 In the arrangement direction of the plurality of second cooling channels 120, the second water opening 202 has a first diffuser side 2021 and a second diffuser side 2022 opposite to each other, and the number of the second cooling channels 120 arranged on the first diffuser side 2021 is the same as the number of the second diffuser side 2022. Specifically, in this embodiment, Figure 4 As shown, ten second cooling channels 120 are arranged along the width direction of the plate body 10, wherein five second cooling channels 120 are located on the first diffuser side 2021 of the second water opening 202, and the other five second cooling channels 120 are located on the second diffuser side 2022 of the second water opening 202.

[0043] Of course, in some other embodiments, the number of the second cooling channels 120 may also be odd, for example, there are eleven second cooling channels 120, and the eleven second cooling channels 120 are arranged along the width direction of the plate body 10, wherein one second cooling channel 120 is arranged corresponding to the second water opening 202, five second cooling channels 120 are located on the first diffuser side 2021 of the second water opening 202, and the other five second cooling channels 120 are located on the second diffuser side 2022 of the second water opening 202.

[0044] Therefore, it can be understood that because the number of second cooling channels 120 arranged on the first diffuser side 2021 and the number of second cooling channels 120 arranged on the second diffuser side 2022 are the same, the coolant in the first diffuser channel 123 can flow evenly into each second cooling channel 120, thereby avoiding a situation where the coolant flow rate in each second cooling channel 120 is too different, thereby causing a large temperature difference between the battery cells 211.

[0045] Optionally, in one embodiment, reference may be made to Figure 5 In the arrangement direction of the plurality of first cooling channels 110, the first water outlet 201 has a first confluence side 2011 and a second confluence side 2012 opposite to each other, and the number of the first cooling channels 110 arranged on the first confluence side 2011 is the same as the number of the first confluence side 2012. Specifically, in this embodiment, Figure 3 As shown, ten first cooling channels 110 are arranged along the width direction of the plate body 10, wherein five first cooling channels 110 are located on the first confluence side 2011 of the first water opening 201, and the other five first cooling channels 110 are located on the second confluence side 2012 of the first water opening 201.

[0046] Of course, in some other embodiments, the number of the first cooling channels 110 may also be odd, for example, there are thirteen first cooling channels 110, and the thirteen first cooling channels 110 are arranged along the width direction of the plate body 10, wherein one second cooling channel 120 is arranged corresponding to the second water opening 202, six first cooling channels 110 are located on the first confluence side 2011 of the first water opening 201, and the other six first cooling channels 110 are located on the first diffusion side 2021 of the first water opening 201.

[0047] It can be understood that in this way, the coolant in the multiple first cooling channels 110 can flow into the connecting channel 122 more evenly and efficiently, and the flow rate between the coolant in the multiple first cooling channels 110 can be more uniform, thereby avoiding the situation where the coolant flow rate in some first cooling channels 110 is too fast and the coolant flow rate in some first cooling channels 110 is too slow, which in turn leads to uneven heat dissipation between multiple columns of battery cells 211.

[0048] Optionally, in one embodiment, as Figure 5 As shown, the connecting channel 122 is located on one side of the first converging channel 121 and the first diffuser channel 123 along the thickness direction of the plate body 10. Specifically, the extension length of the connecting channel 122 is not less than the sum of the lengths of the first converging channel 121 and the first diffuser channel 123, and the connecting channel 122 covers the first converging channel 121 and the first diffuser channel 123. At this time, the first water opening 201 is located on the upper side of the first converging channel 121, and the second water opening 202 is located on the upper side of the first diffuser channel 123. It can be understood that by arranging the connecting channel 122 above the first converging channel 121 and the first diffuser channel 123, the length of the liquid cooling plate 100 can be reduced, which is conducive to the miniaturized design of the battery pack 200.

[0049] Of course, in another embodiment, the connecting channel 122 is located on the side of the first converging channel 121 and the first diffuser channel 123 away from the first cooling channel 110 and the second cooling channel 120, that is, the plurality of first cooling channels 110 and the plurality of second cooling channels 120 are located on one side of the first converging channel 121 and the first diffuser channel 123 along the length direction of the plate body 10, and the connecting channel 122 is located on the other side of the first converging channel 121 and the first diffuser channel 123 along the length direction of the plate body 10, at which time the first water passage 201 faces the plurality of first cooling channels 110, and the second water passage 202 faces the plurality of second cooling channels 120. It can be understood that this can reduce the thickness of the plate body 10 and avoid the problem of a larger thickness of the battery pack 200 after the battery pack 200 is formed.

[0050] Optionally, in one embodiment, as Figure 2 As shown, the plate body 10 includes a cooling plate body 11 and a first guide plate body 12. Figure 3 and Figure 4 The cooling plate body 11 is provided with a first cooling channel 110 and a second cooling channel 120. Figure 5 The first guide plate body 12 is connected to one end of the cooling plate body 11 in the length direction, and the interior of the first guide plate body 12 is hollow and is provided with a first partition 124, the first partition 124 extends along the length direction of the first guide plate body 12, and the first partition 124 divides the internal space of the first guide plate into a connecting channel 122 and a first convergence and divergence channel; a first partition block 125 is also provided in the convergence and divergence channel, the first partition block 125 divides the first convergence and divergence channel into a first convergence channel 121 and a first diffuser channel 123; a first water opening 201 and a second water opening 202 are also provided on the first partition 124, the first water opening 201 is correspondingly connected to the first convergence channel 121, and the second water opening 202 is correspondingly connected to the first diffuser channel 123.

[0051] It can be understood that in this embodiment, the plate body 10 is divided into a cooling plate body 11 and a first guide plate body 12 which are spliced ​​to each other, the first cooling channel 110 and the second cooling channel 120 are arranged in the cooling plate body 11, and the first converging channel 121, the connecting channel 122 and the first diffusion channel 123 are formed in the first guide plate body 12. In this way, each channel can be obtained by a low-cost extrusion molding process, and smooth connection between corresponding channels after splicing is guaranteed.

[0052] Optionally, in one embodiment, as Figure 6 As shown, the plate body 10 further includes a second guide plate body 13, the first guide plate body 12 and the second guide plate body 13 are respectively connected to the two ends of the cooling plate body 11 in the length direction, the interior of the second guide plate body 13 is hollow and is provided with a second spacer 135, and the second spacer 135 divides the interior space of the second guide plate body 13 into a second converging channel 131 and a second diffuser channel 133. The plurality of first cooling channels 110 are all connected to the second diffuser channel 133, and the second guide plate body 13 is provided with a total water inlet 301 connected to the second diffuser channel 133, and the total water inlet 301 is used to connect to the water inlet pipe. The plurality of second cooling channels 120 are all connected to the second converging channel 131, and the second guide plate body 13 is provided with a total water outlet 302 connected to the second converging channel 131, and the total water outlet 302 is connected to the water outlet pipe.

[0053] When in use, the coolant enters the second diffuser channel 133 through the main water inlet 301, and then disperses and flows into the multiple first cooling channels 110. After the coolant flows out from the multiple water outlets 102 of the multiple second cooling channels 120, it first converges in the second converging channel 131, and then flows out of the liquid cooling plate 100 through the main water outlet 302. It can be understood that in this way, only one water inlet pipe and one water outlet pipe can be used to supply water to the multiple first cooling channels 110, and the water in the multiple second cooling channels 120 can be discharged together, which can make the structure of the battery pack 200 simpler.

[0054] Optionally, in one embodiment, as Figure 6As shown, a second baffle 134 is further provided in the second guide plate body 13, and the second baffle 134 extends along the length direction of the second guide plate body 13, and the second baffle 134 divides the internal space of the second guide plate into an idle channel 132 and a second convergence channel; a second baffle 135 is provided in the second convergence channel, and the second baffle 135 divides the second convergence channel into a second convergence channel 131 and a second divergence channel 133. It can be understood that in this way, the second guide plate body 13 and the first guide plate body 12 can be basically the same in overall appearance and internal space, and then the first guide plate body 12 and the second guide plate body 13 can be extruded and formed by the same set of molds, and only the first water port 201, the second water port 202 and other distinguishing structures can be processed accordingly later, which is conducive to reducing production costs.

[0055] Optionally, in one embodiment, the cooling plate body 11 includes a first cooling plate body 111 and a second cooling plate body 112, a plurality of first cooling channels 110 are provided in the first cooling plate body 111, and a plurality of second cooling channels 120 are provided in the second cooling plate body 112; the first cooling channels 110 and the second cooling channels 120 both extend along the length direction of the plate body 10, and the first cooling plate body 111 and the second cooling plate body 112 are spliced ​​with each other along the width direction of the plate body 10. It can be understood that by dividing the cooling plate body 11 into the first cooling plate body 111 and the second cooling plate body 112, not only the molding quality of the entire cooling plate body 11 can be improved during production, but also the first cooling channels 110 and the second cooling channels 120 can be better separated.

[0056] Optional, such as Figure 2 As shown, in one embodiment, the first guide plate body 12, the second guide plate body 13, the first cooling plate body 111 and the second cooling plate body 112 are all provided with a surrounding plate 14, and a plurality of surrounding plates 14 are enclosed to form a mounting groove 15, and the mounting groove 15 is used to mount the battery module 210. That is, in this embodiment, the liquid cooling plate 100 and the battery box are integrally formed, which can simplify the structure of the battery pack 200 and facilitate the miniaturization design of the battery pack 200.

[0057] Optionally, in one embodiment, reference may be made to Figure 3 and Figure 4 The number of the first cooling channels 110 and the number of the second cooling channels 120 are set to be the same. For example, the number of the first cooling channels 110 and the number of the second cooling channels 120 are both ten, and then half of the battery cells 211 in the battery module 210 are cooled by the coolant in the multiple first cooling channels 110, and the other half of the battery cells 211 are cooled by the coolant in the multiple second cooling channels 120. In this way, the temperature between the multiple cells in the battery module 210 can be more uniform.

[0058] Optionally, in one embodiment, as Figure 3 and Figure 4 As shown, the cross-sections of the first cooling channel 110 and the second cooling channel 120 are rectangular, which can increase the water flow rate of the first cooling channel 110 and the second cooling channel 120, thereby improving the heat dissipation effect.

[0059] The embodiment of the present application also provides a battery pack 200, which includes a battery module 210 and a liquid cooling plate 100, wherein the battery module 210 is composed of a plurality of battery cells 211, and the specific structure of the liquid cooling plate 100 refers to the above embodiment. Since the battery pack 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0060] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. In the description of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0061] The liquid cooling plate provided in the embodiment of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid cooling plate, characterized in that: include: A plate body, wherein a first cooling channel, a second cooling channel, a first converging channel, a connecting channel and a first diffusing channel are provided in the plate body; There are a plurality of first cooling channels, each of which has a water inlet formed at one end and is connected to the first confluence channel at the other end; There are a plurality of second cooling channels, each of which has a water outlet formed at one end and is connected to the first diffuser channel at the other end; The connecting channel is provided with a first water opening and a second water opening, the first water opening is communicated with the first converging channel, and the second water opening is communicated with the first diffusing channel; Wherein, in the arrangement direction of the plurality of second cooling channels, the second water outlet has a first diffuser side and a second diffuser side opposite to each other, and the number of the second cooling channels arranged on the first diffuser side is the same as the number of the second cooling channels arranged on the second diffuser side.

2. The liquid cooling plate according to claim 1, characterized in that: In the arrangement direction of the plurality of first cooling channels, the first water outlet has a first confluence side and a second confluence side opposite to each other, and the number of the first cooling channels arranged on the first confluence side is the same as that on the second confluence side.

3. The liquid cooling plate according to claim 1, characterized in that: The connecting channel is located on one side of the first converging channel and the first diffusing channel along the thickness direction of the plate body; Alternatively, the connecting channel is located on a side of the first converging channel and the first diffusing channel that is away from the first cooling channel and the second cooling channel.

4. The liquid cooling plate according to claim 1, characterized in that: The plate body includes a cooling plate body and a first guide plate body connected to one end of the cooling plate body; The cooling plate body is provided with the first cooling channel and the second cooling channel; The interior of the first guide plate body is hollow and is provided with a first partition plate, the first partition plate extends along the length direction of the first guide plate body, and the first partition plate divides the internal space of the first guide plate into the connecting channel and the first converging and dispersing channel; A first spacer is further provided in the converging and diffusing channel, and the first spacer separates the first converging and diffusing channel into the first converging channel and the first diffusing channel; The first partition plate is also provided with the first water opening and the second water opening.

5. The liquid cooling plate according to claim 4, characterized in that: The plate body further includes a second guide plate body, wherein the first guide plate body and the second guide plate body are respectively connected to two ends of the cooling plate body; The interior of the second guide plate body is hollow and is provided with a second spacer, and the second spacer divides the interior space of the second guide plate body into a second converging channel and a second diffusing channel; The plurality of first cooling channels are all connected to the second diffuser channel, and the second guide plate body is provided with a main water inlet connected to the second diffuser channel; The plurality of second cooling channels are all in communication with the second converging channel, and the second guide plate body is provided with a main water outlet in communication with the second converging channel.

6. The liquid cooling plate according to claim 5, characterized in that: A second baffle is further provided in the second guide plate body, the second baffle extends along the length direction of the second guide plate body, and the second baffle divides the inner space of the second guide plate into an idle channel and a second converging channel; The second spacer is disposed in the second converging and diffusing channel, and the second spacer divides the second converging and diffusing channel into the second converging channel and the second diffusing channel.

7. The liquid cooling plate according to claim 5, characterized in that: The cooling plate body comprises a first cooling plate body and a second cooling plate body, the first cooling plate body is provided with a plurality of the first cooling channels, and the second cooling plate body is provided with a plurality of the second cooling channels; The first cooling channel and the second cooling channel both extend along the length direction of the plate body, and the first cooling plate body and the second cooling plate body are spliced ​​with each other along the width direction of the plate body.

8. The liquid cooling plate according to claim 7, characterized in that: The first guide plate body, the second guide plate body, the first cooling plate body and the second cooling plate body are all provided with enclosures, and a plurality of the enclosures are combined to form an installation groove, and the installation groove is used to install a battery module.

9. The liquid cooling plate according to any one of claims 1 to 8, characterized in that: The number of the first cooling channels and the number of the second cooling channels are set to be the same; And / or, the cross-sections of the first cooling channel and the second cooling channel are rectangular.

10. A battery pack, characterized in that: It comprises a battery module and a liquid cooling plate as claimed in any one of claims 1 to 9, wherein the battery module is mounted on the liquid cooling plate.

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