Liquid cooling plate and blade battery

Abstract

The utility model relates to the technical field of batteries, in particular to a liquid cooling plate and a blade battery. The liquid cooling plate sequentially comprises a first end part, a middle part and a second end part along a first direction; the liquid cooling plate comprises a liquid cooling flow channel, the liquid cooling flow channel comprises a water inlet flow channel and a water outlet flow channel communicated with the water inlet flow channel, the water inlet flow channel is arranged at the first end part and / or the second end part, and the water outlet flow channel is arranged at the middle part. Cooling liquid in the liquid cooling flow channel preferentially passes through the first end portion and the second end portion, heat of the two end portions of the blade battery can be better taken away, when the cooling liquid passing through the first end portion and the second end portion passes through the water outlet flow channel, the temperature of the cooling liquid is gradually increased, and therefore the heat dissipation efficiency of the middle area of the blade battery is reduced, and the heat dissipation efficiency of the blade battery is improved. And the temperatures at the two ends of the blade battery and the temperature in the middle area are more balanced.

Description

Technical Field

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

[0002] The structure of the blade battery is similar to a flat long strip shape. This structure makes it easy for the heat generated by the blade battery during the charging and discharging process to gather at both ends of the blade battery. Specifically, when the battery is charging and discharging, the current flows inside the battery. Due to the existence of resistance, more heat will be generated where the current is concentrated. However, the flat structure of the blade battery makes it easier for the current to gather at both ends. Therefore, the temperature at both ends of the blade battery will be relatively high, and the temperature in the middle area of ​​the blade battery will be relatively low. The existing liquid cooling plate structure cannot match its heat generation characteristics, which will cause a large difference in the overall temperature of the blade battery, thereby affecting the power performance of the battery. Utility Model Content

[0003] The present application discloses a liquid cooling plate and a blade battery to solve the problem that the related liquid cooling plate cannot match the heating characteristics of the blade battery, resulting in a large difference in the overall temperature of the blade battery.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a liquid cooling plate, which, along a first direction, includes a first end, a middle part and a second end in sequence; the liquid cooling plate includes a liquid cooling channel, the liquid cooling channel includes a water inlet channel and a water outlet channel connected to the water inlet channel, the water inlet channel is arranged at the first end and / or the second end, and the water outlet channel is arranged at the middle part.

[0006] Among them, when the blade battery is working, the temperature at both ends of the blade battery is relatively high, and the temperature in the middle area is relatively low. The first end and the second end of the liquid cooling plate correspond to the two ends of the blade battery respectively, and the middle part of the liquid cooling plate corresponds to the middle area of ​​the blade battery. Among them, when the liquid cooling channel includes a water inlet channel, the water inlet channel can be arranged at the first end or the second end; when the liquid cooling channel includes two water inlet channels, the first end and the second end are both provided with water inlet channels. The water outlet channel is arranged in the middle part, so the coolant in the liquid cooling channel passes through the first end and the second end first, which can better take away the heat from the two ends of the blade battery. When the coolant after passing through the first end and the second end passes through the water outlet channel, the temperature of the coolant gradually increases, thereby reducing the heat dissipation efficiency of the middle area of ​​the blade battery, thereby making the temperature at both ends of the blade battery and the temperature in the middle area more balanced.

[0007] Furthermore, the water inlet flow channel includes a first water inlet flow channel and a second water inlet flow channel, the first water inlet flow channel is arranged at the first end, and the second water inlet flow channel is arranged at the second end.

[0008] Further, the liquid cooling plate further includes a liquid inlet and a liquid outlet. The liquid inlet includes a first water inlet and a second water inlet. The first water inlet is communicated with a first water inlet flow channel, and the second water inlet is communicated with a second water inlet flow channel. The liquid outlet is communicated with a water outlet flow channel; the sum of the areas of the first water inlet and the second water inlet is equal to the area of the liquid outlet.

[0009] Further, the liquid cooling flow channel further includes an intermediate flow channel. The water inlet flow channel and the water outlet flow channel are communicated through the intermediate flow channel; one of the first end portion and the second end portion is provided with a water inlet flow channel, and the other is provided with an intermediate flow channel.

[0010] Further, heat dissipation fins are provided in the liquid cooling flow channel of the first end portion and / or the second end portion; and / or, a flow dividing bar is provided in the water outlet flow channel.

[0011] Further, along the second direction, the liquid cooling plate includes at least two liquid cooling regions, and the at least two liquid cooling regions share the same water inlet flow channel and water outlet flow channel; a flow disturbing column is provided in the water outlet flow channel between two adjacent liquid cooling regions, wherein the second direction is perpendicular to the first direction.

[0012] Further, the number of the liquid cooling regions is multiple. A plurality of heat dissipation fins arranged along the first direction are provided in the water inlet flow channel, and the heat dissipation fins extend along the second direction; along the second direction, the liquid cooling regions located at both ends of the liquid cooling plate are end regions, and the liquid cooling regions between the two end regions are central regions; along the first direction, the distance between two adjacent heat dissipation fins in the central region is smaller than the distance between two adjacent heat dissipation fins in the end region.

[0013] Further, both the water inlet flow channel and the water outlet flow channel extend along the second direction, and the second direction is perpendicular to the first direction.

[0014] In a second aspect, the present application provides a blade battery, which includes a plurality of single cells and the liquid cooling plate of the first aspect. The arrangement direction of the plurality of single cells is the second direction, and the second direction is perpendicular to the first direction. The liquid cooling plate is located on the surface of the plurality of single cells.

[0015] Because it includes the liquid cooling plate of the first aspect in the present application, the overall temperature of the blade battery is more balanced and the performance is improved.

[0016] Further, the blade battery further includes at least two battery modules. Each battery module includes a plurality of single cells. Along the second direction, the liquid cooling plate includes at least two liquid cooling regions, and the liquid cooling regions correspond to the battery modules one by one. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a liquid cooling plate according to an embodiment of the present application;

[0018] Figure 2Schematic structural diagram of a substrate according to an embodiment of the present application;

[0019] Figure 3 Schematic structural diagram of a liquid cooling plate according to another embodiment of the present application;

[0020] Figure 4 Schematic structural diagram of a blade battery according to an embodiment of the present application.

[0021] Reference numerals in the drawings: 100 - substrate; 110 - first end; 120 - middle part; 130 - second end; 200 - cover plate; 300 - liquid cooling channel; 310 - water inlet channel; 310a - first water inlet channel; 310b - second water inlet channel; 320 - water outlet channel; 330 - middle channel; 400 - heat dissipation fins; 500 - shunt bar; 600 - flow disturbance post; 700 - water inlet pipeline; 800 - water outlet pipeline; 900 - battery module; 910 - single battery;

[0022] 10 - liquid cooling area; 10a - end area; 10b - central area;

[0023] 01 - accommodation cavity; 02 - liquid inlet; 02a - first water inlet; 02b - second water inlet; 03 - liquid outlet. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0025] When the blade battery is working, the temperature at its end is relatively high, and the temperature in the middle area is relatively low. The liquid cooling plate structure of the existing battery cannot match its heat generation characteristics, which will cause a large temperature difference in the overall blade battery, thereby affecting the power performance of the battery.

[0026] In view of this, a liquid cooling plate is provided in the embodiments of the present application, Figure 1 Schematic structural diagram of a liquid cooling plate according to an embodiment of the present application, Figure 2 Schematic structural diagram of a substrate according to an embodiment of the present application, please refer to Figure 1 and Figure 2, along the first direction D1, the liquid cooling plate includes a first end 110, a middle part 120 and a second end 130 in sequence. The first direction is the length direction of the blade battery cell, that is, the first end 110 and the second end 130 of the liquid cooling plate correspond to the two ends of the blade battery cell with relatively high temperatures, and the middle part 120 of the liquid cooling plate corresponds to the middle area of ​​the blade battery cell with relatively low temperatures. The liquid cooling plate includes a substrate 100 and a cover plate 200, and the substrate 100 and the cover plate 200 are arranged to form a closed receiving chamber 01. The receiving chamber 01 contains a coolant, which can be cooling water or other fluids, such as a 50% ethylene glycol mixed solution.

[0027] Continue to refer to Figure 1 and Figure 2 The liquid cooling plate includes a liquid cooling channel 300, and the liquid cooling channel 300 includes an inlet channel 310 and an outlet channel 320 connected to the inlet channel 310. The inlet channel 310 is provided at the first end 110 and / or the second end 130. The temperature of the coolant in the initial state is relatively low, and the efficiency of heat exchange between the coolant in the inlet channel 310 and the two ends of the blade battery is relatively high. The outlet channel 320 is provided at the middle part 120. When the coolant flows from the inlet channel 310 to the outlet channel 320, the temperature of the coolant gradually increases, and the efficiency of heat exchange between the coolant in the outlet channel 320 and the middle area of ​​the blade battery gradually decreases. Therefore, the coolant in the liquid cooling channel 300 passes through the first end 110 and the second end 130 preferentially, which can better take away the heat from the two ends of the blade battery. When the coolant after passing through the first end 110 and the second end 130 passes through the water outlet channel 320, the temperature of the coolant gradually increases, thereby reducing the heat dissipation efficiency of the middle area of ​​the blade battery, thereby making the temperature at both ends of the blade battery and the temperature in the middle area more balanced.

[0028] It is understandable that the lengths of the water inlet channel 310 and the water outlet channel 320 are not limited in the present application. The design is specifically based on the size of the blade battery and the actual temperature of different areas of the blade battery so that the structure of the liquid cooling plate can better match the cooling requirements of the blade battery.

[0029] Continue to refer to Figure 1 and Figure 2 The liquid cooling plate further includes a liquid inlet 02, a liquid outlet 03, a water inlet pipeline 700 and a water outlet pipeline 800. The liquid inlet 02 is arranged in the water inlet channel 310 and communicates with the water inlet pipeline 700, and the liquid outlet 03 is arranged in the water outlet channel 320 and communicates with the water outlet pipeline 800. The coolant enters the water inlet channel 310 from the water inlet pipeline 700 through the liquid inlet 02, then flows from the water inlet channel 310 to the water outlet channel 320, and finally enters the water outlet pipeline 800 through the liquid outlet 03.

[0030] Among them, the number of the water inlet channels 310 in this application is not limited, and the number of the water inlet channels 310 can be one, two or more. As Figure 1 shown, when the number of the water inlet channels 310 is two, that is, the water inlet channels 310 include a first water inlet channel 310a and a second water inlet channel 310b. Correspondingly, the liquid inlet 02 includes a first water inlet 02a and a second water inlet 02b. The first water inlet channel 310a is arranged at the first end 110, and the first water inlet 02a is arranged in the first water inlet channel 310a. The second water inlet channel 310b is arranged at the second end 130, and the second water inlet 02b is arranged in the second water inlet channel 310b. The coolant enters the first water inlet channel 310a from the first water inlet 02a, and then flows from the front end to the end of the first water inlet channel 310a and then flows to the water outlet channel 320. The coolant enters the second water inlet channel 310b from the second water inlet 02b, and then flows from the front end to the end of the second water inlet channel 310b and then flows to the water outlet channel 320.

[0031] Figure 3 is a schematic structural diagram of a liquid cooling plate according to another embodiment of this application. Refer to Figure 3 , when the number of the water inlet channels 310 is one, the liquid cooling channel 300 further includes an intermediate channel 330. The water inlet channel 310 and the water outlet channel 320 are communicated through the intermediate channel 330. One of the first end 110 and the second end 130 is provided with the water inlet channel 310, and the other is provided with the intermediate channel 330. The coolant enters the water inlet channel 310 from the liquid inlet 02, flows to the end of the water inlet channel 310 and then flows to the intermediate channel 330, and then flows into the water outlet channel 320 after passing through the intermediate channel 330. The liquid cooling plate with the above structure is only provided with one liquid inlet 02, which can save space and reduce the probability of interference between the liquid inlet 02 and the rest of the components of the blade battery compared with two or more liquid inlets 02.

[0032] Optionally, the water inlet channel 310 can be a straight channel extending along the second direction D2, and the path is short, so that the water inlet channel 310 has a small pressure drop. Among them, the second direction is perpendicular to the first direction. Similarly, the water outlet channel 320 can be a straight channel extending along the second direction D2, and the path is short, so that the water outlet channel 320 has a small pressure drop.

[0033] Continue to refer to Figure 2 , along the second direction, the first water inlet 02a is located at one end of the first end 110 of the liquid cooling plate, and the second water inlet 02b is located at one end of the second end 130 of the liquid cooling plate. Among them, the first water inlet 02a and the second water inlet 02b can be located at the same end of the liquid cooling plate along the second direction, or can be located at different ends.

[0034] Among them, the sum of the areas of the first water inlet 02a and the second water inlet 02b is equal to the area of the liquid outlet 03. For example, if the areas of the first water inlet 02a and the second water inlet 02b are both S, then the area of the liquid outlet 03 is 2S. When the liquid cooling plate works, the pressure inside the liquid cooling plate is dynamically balanced to improve the heat dissipation effect and the stability of the system.

[0035] Among them, the number of the water outlet channels 320 is not limited in this application, and the number of the water outlet channels 320 can be one, two or more. As Figure 2 shown, the number of the water outlet channels 320 is one, and the cooling liquid in the first water inlet channel 310a and the second water inlet channel 310b converges to the water outlet channel 320. Of course, the number of the water outlet channels 320 can also be two. One of the two water outlet channels 320 is communicated with the first water inlet channel 310a, and the other of the two water outlet channels 320 is communicated with the second water inlet channel 310b.

[0036] Continue to refer to Figure 1 and Figure 2 , heat dissipation fins 400 are arranged in the liquid cooling channel 300 of the first end portion 110, so as to improve the heat dissipation efficiency of the first end portion 110 of the liquid cooling plate for the end portion of the blade battery.

[0037] Optionally, heat dissipation fins 400 are arranged in the liquid cooling channel 300 of the second end portion 130, so as to improve the heat dissipation efficiency of the second end portion 130 of the liquid cooling plate for the end portion of the blade battery.

[0038] Refer to Figure 2 , a flow dividing strip 500 is arranged in the water outlet channel 320. Under the action of the flow dividing strip 500, the water outlet channel 320 is divided and forms a multi-stage parallel flow dividing channel, which is beneficial to the uniformity of flow distribution. At the same time, the fluid boundary layer is broken through multi-level flow division, the heat exchange efficiency is improved, and the cooling effect is better. Moreover, the flow dividing strip 500 helps to reduce the pressure loss inside the liquid cooling channel 300, thereby improving the overall performance of the liquid cooling plate. Among them, the number of the flow dividing strips 500 can be multiple, and the flow dividing strips 500 can extend along the second direction.

[0039] Optionally, the heat dissipation fins 400 and the flow dividing strip 500 are parallel, so that the fluid in the water outlet channel 320 can better match the flow state of the fluid in the water inlet channel 310, thereby promoting the more uniform flow of the fluid.

[0040] Continue to refer to Figure 2, along the second direction, the liquid cooling plate includes at least two liquid cooling regions 10, and the at least two liquid cooling regions 10 share the same water inlet channel 310 and water outlet channel 320. Among them, the water outlet channel 320 is provided with spoiler columns 600 between two adjacent liquid cooling regions 10, and the spoiler columns 600 can affect the flow state of the coolant in the water outlet channel 320, thereby destroying and reconstructing the boundary layer, and further improving the heat transfer performance of the liquid cooling plate.

[0041] Among them, the number of spoiler columns 600 between two adjacent liquid cooling regions 10 can be multiple to improve the heat transfer performance of the liquid cooling plate.

[0042] Optionally, the cross-section of the spoiler column 600 can be circular. The outer surface of the cylindrical spoiler column 600 is relatively smooth, which can better match the wall jet characteristics formed by the fluid, so that the liquid cooling plate has a better heat dissipation effect and a smaller pressure loss.

[0043] In some alternative embodiments, the spacing between two adjacent heat dissipation fins 400 within the same liquid cooling region 10 is equal. Among them, when the number of liquid cooling regions 10 is multiple, the water inlet channel 310 is provided with a plurality of heat dissipation fins 400 arranged along the first direction, and the heat dissipation fins 400 extend along the second direction. Along the second direction, the liquid cooling regions 10 at both ends of the liquid cooling plate are end regions 10a, and the liquid cooling regions 10 between the two end regions 10a are central regions 10b. Along the first direction, the spacing between two adjacent heat dissipation fins 400 in the central region 10b is smaller than the spacing between two adjacent heat dissipation fins 400 in the end region 10a, that is, the heat dissipation fins 400 in the central region 10b are more dense, have a higher heat transfer coefficient, and thus have a better heat dissipation effect, and the pressure loss in the liquid cooling channel 300 is also smaller.

[0044] In some alternative embodiments, the materials of the substrate 100, the cover plate 200, and the heat dissipation fins 400 can all be aluminum alloy, so that the liquid cooling plate has good thermal conductivity, low density, and reduces the overall weight of the liquid cooling plate.

[0045] Based on the same technical concept, the embodiment of the present application also provides a blade battery. Figure 4 It is a schematic structural diagram of a blade battery according to an embodiment of the present application. Refer to Figure 4, the blade battery includes a plurality of single cells 910 and a liquid cooling plate in various possible embodiments of the present application. The arrangement direction of the plurality of single cells 910 is the second direction D2, and the second direction D2 is perpendicular to the first direction D1. The liquid cooling plate is located on the surface of the plurality of single cells 910. Along the first direction, the first end 110 of the liquid cooling plate corresponds to one end of the single cell 910, the second end 130 of the liquid cooling plate corresponds to the other end of the single cell 910, and the middle portion 120 of the liquid cooling plate corresponds to the middle region of the single cell 910. Because the liquid cooling plate in the present application is partitioned, and the heat dissipation efficiency of the first end 110 and the second end 130 of the liquid cooling plate is higher than that of the middle portion 120 of the liquid cooling plate. Therefore, the heat exchange efficiency between the two ends of the blade battery and the liquid cooling plate is higher than that of the middle region of the blade battery, so that the temperatures of the middle region and the ends of the blade battery are more balanced.

[0046] Continue to refer to Figure 4 , a plurality of blade battery monomers can form a battery module 900, and at least two battery modules 900 are arranged along the second direction. Along the second direction, the liquid cooling plate includes at least two liquid cooling regions 10, and the liquid cooling regions 10 correspond to the battery modules 900 one by one.

[0047] Along the second direction, battery modules 900 are provided on both sides of the battery module 900 in the middle position. Each battery module 900 is equivalent to a heat source. Therefore, the battery module 900 in the middle position has a worse heat dissipation environment. In order to make the temperatures of the plurality of battery modules 900 more balanced, along the first direction, the distance between two adjacent heat dissipation fins 400 in the central region 10b of the liquid cooling plate is smaller than the distance between two adjacent heat dissipation fins 400 in the end region 10a, that is, the heat dissipation fins 400 in the central region 10b are denser. Therefore, the central region 10b of the liquid cooling plate has a higher heat transfer coefficient, and the heat exchange efficiency between it and the corresponding battery module 900 is higher, so that the temperatures between the plurality of battery modules 900 can be more balanced.

[0048] It can be understood that the central region 10b of the liquid cooling plate may include a plurality of liquid cooling regions 10. The temperatures of the battery modules 900 corresponding to the above liquid cooling regions 10 may be different. Therefore, the distance between two adjacent heat dissipation fins 400 in the above liquid cooling regions 10 can be set according to actual situations.

[0049] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A liquid cooling plate, characterized in that: Along the first direction, the liquid cooling plate includes a first end, a middle part and a second end in sequence; the liquid cooling plate includes a liquid cooling channel, and the liquid cooling channel includes a water inlet channel and a water outlet channel connected to the water inlet channel, the water inlet channel is arranged at the first end and / or the second end, and the water outlet channel is arranged at the middle part.

2. The liquid cooling plate according to claim 1, characterized in that: The water inlet flow channel includes a first water inlet flow channel and a second water inlet flow channel. The first water inlet flow channel is arranged at the first end portion, and the second water inlet flow channel is arranged at the second end portion.

3. The liquid cooling plate according to claim 2, characterized in that: The liquid cooling plate further includes a liquid inlet and a liquid outlet, the liquid inlet includes a first water inlet and a second water inlet, the first water inlet is connected to the first water inlet channel, the second water inlet is connected to the second water inlet channel, and the liquid outlet is connected to the water outlet channel; The sum of the areas of the first water inlet and the second water inlet is equal to the area of ​​the liquid outlet.

4. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling channel also includes an intermediate channel, and the water inlet channel and the water outlet channel are connected through the intermediate channel; One of the first end and the second end is provided with the water inlet flow channel, and the other is provided with the middle flow channel.

5. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling channel at the first end and / or the second end is provided with heat dissipation fins; and / or, the water outlet channel is provided with a diverter strip.

6. The liquid cooling plate according to claim 1, characterized in that: Along the second direction, the liquid cooling plate includes at least two liquid cooling areas, and the at least two liquid cooling areas share the same water inlet channel and the water outlet channel; the water outlet channel is provided with a spoiler column between two adjacent liquid cooling areas, wherein the second direction is perpendicular to the first direction.

7. The liquid cooling plate according to claim 6, characterized in that: The number of the liquid cooling areas is multiple, the water inlet channel is provided with multiple heat dissipation fins arranged along the first direction, and the heat dissipation fins extend along the second direction; Along the second direction, the liquid cooling areas at both ends of the liquid cooling plate are end areas, and the liquid cooling area between the two end areas is a central area; Along the first direction, a distance between two adjacent heat dissipation fins in the central region is smaller than a distance between two adjacent heat dissipation fins in the end region.

8. The liquid cooling plate according to any one of claims 1 to 7, characterized in that: The water inlet channel and the water outlet channel both extend along a second direction, and the second direction is perpendicular to the first direction.

9. A blade battery, characterized in that: The blade battery includes a plurality of single cells and a liquid cooling plate as described in any one of claims 1 to 8, wherein the arrangement direction of the plurality of single cells is a second direction, the second direction is perpendicular to the first direction, and the liquid cooling plate is located on the surface of the plurality of single cells.

10. The blade battery according to claim 9, characterized in that: The blade battery also includes at least two battery modules, each of which includes a plurality of single cells. Along the second direction, the liquid cooling plate includes at least two liquid cooling areas, each of which corresponds to the battery modules one by one.

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