A microchannel liquid-cooled battery module and energy storage plug-in box

Abstract

A microchannel liquid-cooled battery module and an energy storage plug-in box, the microchannel liquid-cooled battery module includes a microchannel liquid-cooled plate, a battery cell group and a busbar, the upper plate surface of the microchannel liquid-cooled plate is attached to the busbar, and the lower plate surface of the microchannel liquid-cooled plate is attached to the top of the battery cell group; the microchannel liquid-cooled plate is composed of a plurality of liquid-cooled units, the liquid-cooled unit is provided with a microchannel flow channel and a pole hole, the pole of the battery cell group extends from the pole hole, the microchannel flow channel includes an inlet section, an outlet section and a surrounding section, the surrounding section surrounds the outer periphery of the pole hole and is annular, the liquid-cooled unit is also provided with a liquid inlet and a liquid outlet, the liquid inlet, the inlet section, the surrounding section, the outlet section and the liquid outlet are connected in sequence. The energy storage plug-in box adopts the above-mentioned energy storage module, and the present invention arranges the microchannel liquid-cooled plate between the busbar and the battery cell, thereby increasing the energy density of the module, and through the microchannel flow channel, the heat management of the area with large heat generation can be efficiently performed, so that the battery module has good temperature uniformity, and belongs to the field of electric energy storage technology.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a microchannel liquid-cooled battery module and an energy storage plug-in box. Background Art

[0002] Battery modules are an important component of energy storage power systems. Single cells are assembled into modules, and modules are packaged into boxes to form the smallest power system unit. Among them, lithium-ion batteries are the core part of the entire battery system. Their safety, reliability and durability are crucial, and they have an important impact on the production cost, operating performance and safety performance of the entire battery system. If the battery pack does not take corresponding heat dissipation measures, it will lead to battery charging and discharging performance degradation, accelerated aging, and even thermal runaway or explosion. Compared with air cooling, liquid cooling is widely used due to its excellent performance. Liquid cooling is divided into direct contact and indirect contact, among which indirect contact occupies a dominant position in cooling methods. Therefore, the design and construction of the flow channel are particularly important.

[0003] The main heat generating components in the module are the battery cells and busbars. The existing liquid cooling devices mainly use bottom liquid cooling. Bottom liquid cooling means placing the liquid cooling plate under the battery cells, which can achieve better cooling effects, but corresponding problems follow:

[0004] 1) The battery cells are pressed on top of the liquid cooling plate. In order to ensure the smoothness of the flow channel of the liquid cooling plate, some reinforcing beams have to be set up. Therefore, the overall structure of the plug-in box will increase and the energy density will decrease.

[0005] 2) The heat of the battery cells and bus is taken away by the bottom liquid cooling plate through heat conduction, but at the same time there is also convection heat exchange between the bottom liquid cooling plate shell and the air, which means that at room temperature of 25°C, the bottom liquid cooling plate is cooling the air while taking away the heat of the battery cells and bus, causing certain losses.

[0006] 3) The battery cells and busbars at the end of the module are special. The battery cells at the end are connected to the end plates, and the air contact area of ​​the end plates is large. At room temperature of 25°C, the end plates can take away some of the heat of the battery cells at the end. Therefore, the temperature of the battery cells at the end will be lower than that of the middle battery cells, which will increase the temperature difference between the battery cells. The busbars at the end are connected to the positive and negative poles of the module, so the busbars at the end will be affected by the heating of the components around the positive and negative poles and will often be higher than the busbars in the middle, which will also increase the temperature difference. Summary of the invention

[0007] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a microchannel liquid-cooled battery module and an energy storage plug-in box that can increase the energy density of the module and have good temperature uniformity.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a microchannel liquid-cooled battery module, comprising a microchannel liquid-cooling plate, a battery cell group and a bus, the upper plate surface of the microchannel liquid-cooling plate is attached to the bus, and the lower plate surface of the microchannel liquid-cooling plate is attached to the top of the battery cell group; the microchannel liquid-cooling plate is composed of a plurality of liquid-cooling units, the liquid-cooling unit is provided with a microchannel flow channel and a pole hole, the pole of the battery cell group extends from the pole hole, the microchannel flow channel comprises an inlet section, an outlet section and a surrounding section, the surrounding section surrounds the outer periphery of the pole hole and is in a circular ring shape, the liquid cooling unit is also provided with a liquid inlet and a liquid outlet, the liquid inlet, the inlet section, the surrounding section, the outlet section and the liquid outlet are connected in sequence.

[0009] After adopting this structure, the microchannel liquid cooling plate is arranged between the bus and the battery cell, and by setting the pole hole, the structure is compact, which can not only increase the energy density of the module, but also improve the structural strength. By adopting the microchannel flow path, the pole and the bus with higher heat generation can be efficiently managed, so that the temperature uniformity of the entire battery module is good.

[0010] As a preference, there are two pole holes in each liquid cooling unit, and there are two surrounding sections which surround the periphery of the two pole holes respectively; the two ends of the inlet section are respectively connected to the two surrounding sections, and the two ends of the outlet section are respectively connected to the two surrounding sections, the liquid inlet is connected to the middle of the inlet section, and the liquid outlet is connected to the middle of the outlet section.

[0011] As a preferred embodiment, the inlet section and the outlet section are both arc-shaped, the arc centers of the inlet section and the outlet section are both located on the perpendicular bisector of the line segment between the centers of the two pole holes, and the outer sides of the inlet section and the outlet section are respectively tangent to the outer sides of the corresponding surrounding sections, so that the microchannel flow path is elliptical.

[0012] As a preferred embodiment, the microchannel liquid cooling plate is placed horizontally, and the upper wall and lower wall of the microchannel flow channel are respectively provided with a plurality of upper micro-ribs and a plurality of lower micro-ribs, and micro-grooves are formed between adjacent upper micro-ribs and adjacent lower micro-ribs respectively; in the inlet section and the outlet section, the upper micro-ribs and the lower micro-ribs are both arc-shaped and the upper micro-ribs and the lower micro-ribs are staggered; in the surrounding section, the upper micro-ribs and the lower micro-ribs are both circular rings with the pole as the center, and the upper micro-ribs and the lower micro-ribs are staggered.

[0013] As a preferred embodiment, it also includes a first temperature averaging plate, which includes a connecting plate section and two heat dissipation plate sections, and the connecting plate section is vertically connected between the two heat dissipation plate sections, so that the first temperature averaging plate is in an I-shape; the battery cell group includes multiple battery cells and end plates, and the multiple battery cells are arranged in N rows and M columns, and a battery cell gap is left between two adjacent columns of battery cells. The connecting plate section passes through the battery cell gap and fits the side of the battery cell, and the two heat dissipation plate sections are respectively located at the two ends of the corresponding two columns of battery cells. The end plate is arranged on the outside of the heat dissipation plate section, and the top of the first temperature averaging plate fits the lower plate surface of the microchannel liquid cooling plate; N and M are not less than 2.

[0014] As a preferred embodiment, the number of liquid cooling units is the same as that of battery cells and they are arranged in one-to-one correspondence, and the positive pole and negative pole of the battery cell extend out from the two pole holes respectively; the liquid cooling unit is also provided with an explosion-proof valve reserved hole, which is located between the two pole holes.

[0015] As a preference, multiple liquid cooling units corresponding to each column of battery cells are arranged in series, and the liquid inlet of the previous liquid cooling unit is connected to the liquid outlet of the next liquid cooling unit; two adjacent columns of liquid cooling units are arranged in series or in parallel.

[0016] As a preference, in each column of battery cells, large surfaces of two adjacent battery cells are adjacent, and a second temperature balancing plate is provided between the two adjacent battery cells.

[0017] As a preference, in each column of battery cells, large surfaces of two adjacent battery cells are adjacent, and a heat insulating material is provided between the two adjacent battery cells.

[0018] An energy storage plug-in box adopts the above-mentioned microchannel liquid-cooled battery module, including a plug-in box body, the microchannel liquid-cooled battery module is located in the plug-in box body, and the plug-in box body is provided with a total liquid inlet pipe and a total liquid outlet pipe, the total liquid inlet pipe and the total liquid outlet pipe are respectively connected to the microchannel liquid cooling plate, so that the coolant enters the microchannel liquid cooling plate from the total liquid inlet pipe, passes through multiple microchannel flow channels, and then flows out from the total liquid outlet pipe.

[0019] In general, the present invention has the following advantages:

[0020] (1) The microchannel liquid cooling plate is placed between the bus and the battery cell to cool both at the same time, thereby improving the cooling efficiency.

[0021] (2) The microchannel liquid cooling plate is arranged between the bus and the battery cell, and the pole hole and the explosion-proof valve reserved hole are set to facilitate its installation with the bus and the battery cell. Compared with the bottom liquid cooling method, the module can be thinner in the thickness direction and the number of structural parts can be reduced, which not only improves the energy density of the module, but also improves the structural strength.

[0022] (3) An elliptical microchannel flow channel is used to reduce flow resistance while ensuring that the cooling medium can flow near the components that need to be cooled. Upper and lower micro-ribs are set to reduce fluid laminar flow, enhance heat transfer, and improve heat exchange efficiency.

[0023] (4) An I-shaped first temperature averaging plate is used and connected to the end plates at both ends. The air cools the end plates and the first temperature averaging plate at the same time. The first temperature averaging plate conducts heat from the end to the middle to achieve the purpose of balancing the temperature of the entire battery cell group. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the assembly of a microchannel liquid-cooled battery module.

[0025] Figure 2 This is an exploded view of a microchannel liquid-cooled battery module.

[0026] Figure 3 This is a front view of the liquid cooling unit.

[0027] Figure 4 A side view of the liquid cooling unit.

[0028] Figure 5 for Figure 4 Middle DD section view.

[0029] Figure 6 for Figure 3 Middle AA section view.

[0030] Figure 7 for Figure 6 Enlarged view of area C.

[0031] Figure 8 for Figure 3 Middle BB section view.

[0032] Fig. 9 for Figure 8 Enlarged view of area E.

[0033] Fig.10 Schematic diagram of the structure of the microchannel flow channel.

[0034] Fig.11 A partial cross-sectional schematic diagram of the microchannel flow path.

[0035] Fig.12 Schematic diagram of the explosion of the end plate, the first temperature equalizing plate, the insulation material and the battery cell group.

[0036] 1 is the bottom plate, 2 is the microchannel liquid cooling plate, 3 is the bus bar, 4 is the battery cell, 5 is the second temperature equalizing plate, 6 is the end plate, 7 is the microchannel flow channel, and 8 is the first temperature equalizing plate.

[0037] 21 is a liquid cooling unit, 211 is a pole hole, 212 is a reserved hole for explosion-proof valve, 213 is an inlet section, 214 is a surrounding section, 215 is an outlet section, 216 is an upper micro-rib, 217 is a lower micro-rib, 218 is a liquid inlet, and 219 is a liquid outlet. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] A microchannel liquid-cooled battery module comprises a microchannel liquid-cooling plate 2, a battery cell group and a bus 3, wherein the upper plate surface of the microchannel liquid-cooling plate 2 is bonded to the bus 3, and the lower plate surface of the microchannel liquid-cooling plate 2 is bonded to the top of the battery cell group; the microchannel liquid-cooling plate 2 is composed of a plurality of liquid-cooling units 21, wherein the liquid-cooling unit 21 is provided with a microchannel flow channel 7 and a pole hole 211, and the pole of the battery cell group extends from the pole hole 211, and the microchannel flow channel 7 comprises an inlet section 213, an outlet section 215 and a surrounding section 214, and the surrounding section 214 surrounds the outer periphery of the pole hole 211 and is in a circular ring shape, and the liquid-cooling unit 21 is further provided with a liquid inlet 218 and a liquid outlet 219, and the liquid inlet 218, the inlet section 213, the surrounding section 214, the outlet section 215 and the liquid outlet 219 are connected in sequence. The cooling medium enters the liquid cooling unit 21 from the liquid inlet 218 , passes through the inlet section 213 , the surrounding section 214 and the outlet section 215 of the liquid cooling unit 21 in sequence, and then flows out of the liquid cooling unit 21 from the liquid outlet 219 .

[0040] refer to Figure 1 , busbar 3 is welded on the pole with the expansion joint facing upward. When the battery module is running, the battery cell 4 is connected through the busbar 3, and the current flows through the parallel battery cell 4 and busbar 3, so the battery cell 4 and busbar 3 are the main heating elements. The heat generated at the pole of the battery cell 4 and the welding point between the pole and the busbar 3 is relatively large, so thermal management is required to maintain the battery cell 4 at the optimal operating temperature.

[0041] The microchannel liquid cooling plate 2 is 1.6 mm thick and is arranged between the battery cell group and the bus 3. It cools the battery cell 4 while cooling the bus 3. The bus 3 at the end is usually connected to other electrical components. Therefore, the bus 3 at the end is an influencing factor that increases the temperature difference of the module. Arranging the microchannel liquid cooling plate 2 between the battery cell 4 and the bus 3 can be beneficial to the temperature uniformity of the bus 3. In addition, arranging the microchannel liquid cooling plate 2 between the battery cell 4 and the bus 3 reduces the box volume compared to the bottom liquid cooling, and increases the energy density and box structure strength.

[0042] refer to Figure 2 The microchannel flow channel 7 is located inside the liquid cooling unit 21. The liquid cooling unit 21 includes an upper cover plate and a lower base plate. The microchannel flow channel 7, the liquid inlet 218 and the liquid outlet 219 are all formed by the gap between the upper cover plate and the lower base plate. Multiple liquid cooling units 21 are arranged and combined into a microchannel liquid cooling plate 2, wherein the liquid inlet 218 of a single liquid cooling unit 21 is directly connected to the liquid inlet 218 of the next microchannel flow channel 7.

[0043] refer to Figure 3~Figure 11, each liquid cooling unit 21 has two pole holes 211, two surrounding sections 214, and surrounds the periphery of the two pole holes 211 respectively; the two ends of the inlet section 213 are connected to the two surrounding sections 214 respectively, the two ends of the outlet section 215 are connected to the two surrounding sections 214 respectively, the liquid inlet 218 is connected to the middle of the inlet section 213, and the liquid outlet 219 is connected to the middle of the outlet section 215. The liquid inlet 218 extends outward from the middle of the inlet section 213, and the liquid outlet 219 extends outward from the middle of the outlet section 215. The thickness of the liquid inlet 218 and the liquid outlet 219 is 1.1 mm, and the width is 18 mm.

[0044] The inlet section 213 and the outlet section 215 are both in arc shape, the arc centers of the inlet section 213 and the outlet section 215 are both located on the perpendicular midline of the line segment between the centers of the two pole holes 211, and the outer sides of the inlet section 213 and the outlet section 215 are respectively tangent to the outer sides of the corresponding surrounding sections 214, so that the microchannel flow passage 7 is elliptical. By designing the flow passage shape as above, the flow resistance can be reduced.

[0045] The microchannel liquid cooling plate 2 is placed horizontally, and the upper wall and lower wall of the microchannel flow channel 7 are respectively provided with a plurality of upper micro-ribs 216 and a plurality of lower micro-ribs 217, and micro grooves are respectively formed between adjacent upper micro-ribs 216 and adjacent lower micro-ribs 217; in the inlet section 213 and the outlet section 215, the upper micro-ribs 216 and the lower micro-ribs 217 are both arc-shaped and staggered; in the surrounding section 214, the upper micro-ribs 216 and the lower micro-ribs 217 are both annular with the pole as the center, and the upper micro-ribs 216 and the lower micro-ribs 217 are staggered. The upper micro-ribs 216 and the lower micro-ribs 217 protrude from the upper wall and the lower wall, respectively, and the sum of the heights of the upper micro-ribs 216 and the lower micro-ribs 217 is less than the distance between the upper wall and the lower wall. The cooling medium (water or ethylene glycol) enters through the liquid inlet 218 and passes through the microgrooves that are recessed upward and downward to reduce the fluid laminar flow. The upper and lower microgrooves are connected through the space in the middle, which reduces the flow resistance to a certain extent.

[0046] The height of the upper micro-ribs 216 and the lower micro-ribs 217 are both 20% of the thickness of the microchannel liquid cooling plate 2. The upper micro-ribs 216 and the lower micro-ribs 217 are staggered, that is, the upper micro-ribs 216 face the micro-grooves on the lower wall, and the lower micro-ribs 217 face the micro-grooves on the upper wall, which can reduce fluid laminar flow and improve heat exchange efficiency.

[0047] The interval between adjacent upper micro-rib 216 rings in the surrounding section 214 is 1mm, the minimum diameter of the upper micro-rib 216 ring is 25mm, the maximum diameter of the upper micro-rib 216 ring is 47mm, and the lower micro-rib 217 is staggered accordingly. In the inlet section 213 and the outlet section 215, the arc center of the upper micro-rib 216 and the arc center of the lower micro-rib 217 are both located at the pole. The diameters of two adjacent upper micro-ribs 216 differ by 10mm, the minimum diameter of the upper micro-rib 216 is 52mm, the maximum diameter is 122mm, and the lower micro-rib 217 is staggered accordingly. The micro-grooves of the surrounding section 214 on the periphery of the pole are denser than those of the inlet section and the outlet section, which can enhance the convective heat transfer efficiency at the pole.

[0048] refer to Fig.12 , further comprising a first temperature averaging plate 8, the first temperature averaging plate 8 comprising a connecting plate section and two heat dissipation plate sections, the connecting plate section being vertically connected between the two heat dissipation plate sections, so that the first temperature averaging plate 8 is in an I-shape; the battery cell group comprises a plurality of battery cells 4 and an end plate 6, the plurality of battery cells 4 are arranged in N rows and M columns, a battery cell gap is left between two adjacent columns of battery cells 4, the connecting plate section passes through the battery cell gap and fits the side of the battery cell 4, the two heat dissipation plate sections are respectively located at the two ends of the corresponding two columns of battery cells 4, the end plate 6 is arranged on the outside of the heat dissipation plate section, and the top of the first temperature averaging plate 8 fits the lower plate surface of the microchannel liquid cooling plate 2; N and M are both not less than 2. M is an even number, the number of the first temperature averaging plates 8 is M / 2, the number of the end plates 6 is 2M, the outsides of the heat dissipation plate sections at the two ends of each column of battery cells 4 are correspondingly provided with end plates 6, and the end plates 6, the battery cell group and the first temperature averaging plate 8 are fixedly connected.

[0049] The first temperature averaging plate 8 is made of a metal material with low thermal resistance. Through the heat conduction of the first temperature averaging plate 8 itself, the heat in the middle of each column of cells 4 can be transferred to the outside. The air cools the end plate 6 while cooling the first temperature averaging plate 8, thereby cooling the entire module and reducing the temperature difference between the middle and end cells. The heat of the cells 4, busbars 3 and the first temperature averaging plate 8 can all be taken away by the microchannel liquid cooling plate 2, further improving the overall temperature uniformity of the module.

[0050] The number of liquid cooling units 21 is the same as that of battery cells 4 and they are arranged one by one. The positive pole and the negative pole of the battery cell 4 extend out from the two pole holes 211 respectively. The liquid cooling unit 21 is also provided with an explosion-proof valve reserved hole 212, which is located between the two pole holes 211. The explosion-proof valve reserved hole 212 corresponds to the explosion-proof valve of the battery cell 4, which facilitates the installation of the microchannel between the battery cell 4 and the bus bar 3.

[0051] The multiple liquid cooling units 21 corresponding to each column of battery cells 4 are arranged in series, and the liquid inlet 218 of the previous liquid cooling unit 21 is connected to the liquid outlet 219 of the next liquid cooling unit 21; the liquid cooling units 21 of two adjacent columns are arranged in series or in parallel.

[0052] In some embodiments, the number of columns of battery cells 4 is 2, corresponding to two columns of liquid cooling units 21. The microchannel liquid cooling plate 2 can be connected to the liquid inlet 218 and the liquid outlet 219 on the same side, so that the two-inlet and two-outlet microchannel liquid cooling plate 2 becomes a one-inlet and one-outlet structure on the same side, and the overall flow direction of the fluid is U-shaped, which sacrifices the flow resistance but can further improve the heat exchange efficiency.

[0053] In each column of battery cells 4 , large surfaces of two adjacent battery cells 4 are adjacent to each other, and a second temperature balancing plate 5 is disposed between the two adjacent battery cells 4 .

[0054] In some embodiments, reference Fig.12 In each column of battery cells 4, the large surfaces of two adjacent battery cells 4 are adjacent, and a heat insulating material is provided between the two adjacent battery cells 4. When the temperature of a single battery cell 4 is too high, the heat insulating material can be used to prevent thermal runaway.

[0055] The upper surface of the microchannel liquid cooling plate 2 is coated with insulating paint to ensure insulation between it and the bus 3. The lower surface of the microchannel liquid cooling plate 2 is coated with thermal conductive structural adhesive, which is connected to the top of the battery cell group through the thermal conductive structural adhesive to cool the battery cell 4 while increasing the structural strength of the module.

[0056] An energy storage plug-in box adopts the above-mentioned microchannel liquid-cooled battery module, including a plug-in box body, the microchannel liquid-cooled battery module is located in the plug-in box body, and the plug-in box body is provided with a total liquid inlet pipe and a total liquid outlet pipe, the total liquid inlet pipe and the total liquid outlet pipe are respectively connected to the microchannel liquid cooling plate 2, so that the coolant enters the microchannel liquid cooling plate 2 from the total liquid inlet pipe, passes through multiple microchannel flow channels 7, and then flows out from the total liquid outlet pipe.

[0057] When two adjacent columns of liquid cooling units 21 are arranged in parallel, the main liquid inlet pipe is connected with multiple parallel liquid inlets, and the main liquid outlet pipe is connected with multiple parallel liquid outlets to connect multiple columns of liquid cooling units 21 accordingly.

[0058] The microchannel liquid-cooled battery module also includes a base plate 1, on which the battery cell group is fixedly arranged. The base plate 1 can be fixed to the bottom of the plug-in box body to facilitate the installation of the battery module.

[0059] The above embodiments are preferred implementation modes of the invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A microchannel liquid-cooled battery module, characterized in that: It includes a microchannel liquid cooling plate, a battery cell group and a bus bar, wherein the upper plate surface of the microchannel liquid cooling plate is attached to the bus bar, and the lower plate surface of the microchannel liquid cooling plate is attached to the top of the battery cell group; The microchannel liquid cooling plate is composed of a plurality of liquid cooling units. The liquid cooling unit is provided with a microchannel flow channel and a pole hole. The pole of the battery cell group extends out of the pole hole. The microchannel flow channel includes an inlet section, an outlet section and a surrounding section. The surrounding section surrounds the outer periphery of the pole hole and is in a circular ring shape. The liquid cooling unit is also provided with a liquid inlet and a liquid outlet. The liquid inlet, the inlet section, the surrounding section, the outlet section and the liquid outlet are connected in sequence. There are two pole holes in each liquid cooling unit, and two surrounding sections respectively surrounding the peripheries of the two pole holes; The two ends of the inlet section are respectively connected to the two surrounding sections, the two ends of the outlet section are respectively connected to the two surrounding sections, the liquid inlet is connected to the middle of the inlet section, and the liquid outlet is connected to the middle of the outlet section; The inlet section and the outlet section are both arc-shaped, and the arc centers of the inlet section and the outlet section are both located on the perpendicular bisector of the line segment between the centers of the two pole holes. The outer sides of the inlet section and the outlet section are tangent to the outer sides of the corresponding surrounding sections, respectively, so that the microchannel flow path is elliptical.

2. A microchannel liquid-cooled battery module according to claim 1, characterized in that: The microchannel liquid cooling plate is placed horizontally, and the upper wall surface and the lower wall surface of the microchannel flow channel are respectively provided with a plurality of upper micro-ribs and a plurality of lower micro-ribs, and micro grooves are respectively formed between adjacent upper micro-ribs and adjacent lower micro-ribs; In the inlet section and the outlet section, the upper micro-ribs and the lower micro-ribs are both arc-shaped and the upper micro-ribs and the lower micro-ribs are arranged alternately; In the surrounding section, both the upper micro-ribs and the lower micro-ribs are in a circular ring shape with the pole as the center, and the upper micro-ribs and the lower micro-ribs are arranged alternately.

3. A microchannel liquid-cooled battery module according to claim 1, characterized in that: It also includes a first temperature averaging plate, which includes a connecting plate section and two heat dissipation plate sections, wherein the connecting plate section is vertically connected between the two heat dissipation plate sections, so that the first temperature averaging plate is in an I-shape; The battery cell group includes a plurality of battery cells and an end plate. The plurality of battery cells are arranged in N rows and M columns. A battery cell gap is left between two adjacent columns of battery cells. The connecting plate section passes through the battery cell gap and fits the side surface of the battery cell. The two heat dissipation plate sections are respectively located at the two ends of the corresponding two columns of battery cells. The end plate is arranged on the outside of the heat dissipation plate section. The top end of the first temperature averaging plate fits the lower plate surface of the microchannel liquid cooling plate. Both N and M are not less than 2.

4. A microchannel liquid-cooled battery module according to claim 3, characterized in that: The number of liquid cooling units is the same as that of battery cells and they are arranged one by one, and the positive pole and negative pole of the battery cell extend out from two pole holes respectively; The liquid cooling unit is also provided with a reserved hole for an explosion-proof valve, and the reserved hole for the explosion-proof valve is located between the two pole holes.

5. A microchannel liquid-cooled battery module according to claim 3, characterized in that: Multiple liquid cooling units corresponding to each column of battery cells are arranged in series, and the liquid inlet of the previous liquid cooling unit is connected to the liquid outlet of the next liquid cooling unit; Two adjacent rows of liquid cooling units are arranged in series or in parallel.

6. A microchannel liquid-cooled battery module according to claim 3, characterized in that: In each column of battery cells, large surfaces of two adjacent battery cells are adjacent, and a second temperature averaging plate is provided between the two adjacent battery cells.

7. A microchannel liquid-cooled battery module according to claim 3, characterized in that: In each column of battery cells, large surfaces of two adjacent battery cells are adjacent, and heat insulation material is provided between the two adjacent battery cells.

8. An energy storage plug-in box, using the microchannel liquid-cooled battery module according to any one of claims 1 to 7, characterized in that: It includes a plug-in box body, in which the microchannel liquid-cooled battery module is located. The plug-in box body is provided with a total liquid inlet pipe and a total liquid outlet pipe, which are respectively connected to the microchannel liquid cooling plate, so that the coolant enters the microchannel liquid cooling plate from the total liquid inlet pipe, passes through multiple microchannel flow channels, and then flows out from the total liquid outlet pipe.

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