Liquid cooling device for energy storage battery module

Abstract

The utility model relates to the technical field of liquid cooling of energy storage batteries, in particular to a liquid cooling device for an energy storage battery module. The plurality of vertical plates are vertically arranged on the bottom plate at preset intervals; the refrigerant flow channel comprises a bottom plate flow channel and a refrigerant buffer area which are formed in the bottom plate, and a vertical plate flow channel formed in the vertical plate, the bottom plate flow channel and the vertical plate flow channel are connected in parallel, and the inlet and outlet ends of the bottom plate flow channel and the vertical plate flow channel are both communicated with the refrigerant buffer area. Through the arrangement, the problem that the overall temperature consistency is poor due to the fact that the temperature difference of the batteries in the height direction is large under the high-rate operation working condition of an existing battery module is solved, the service life of the energy storage batteries is effectively prolonged, use safety of the energy storage batteries is ensured, synchronous flowing of refrigerants in the vertical plate flow channels and the bottom plate flow channels is achieved, and the service life of the batteries is prolonged. The refrigerant circulation time is effectively shortened, and the heat transfer efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of liquid cooling device for energy storage battery module, belong to energy storage battery liquid cooling technical field. BACKGROUND

[0002] With the high-speed development of new energy field in China, power system is also in the key period of transformation and upgrading, and energy storage technology, as an important support of new power system, its safety and stability will be an important indicator of energy storage device. Electrochemical energy storage device mainly uses lithium battery as energy storage unit, and lithium battery will generate a lot of heat when operating at high rate, and if effective thermal management is not carried out, there will be a risk of thermal runaway, causing fire and other safety accidents.

[0003] The existing energy storage battery liquid cooling plate in the industry is mainly a one-piece bottom heat dissipation structure, which can only contact and conduct heat at the bottom of the battery. For the current mainstream square aluminum shell energy storage battery, it will cause a large temperature difference in the height direction. For example, the 280Ah energy storage battery (174×74×204 long×wide×high) uses a bottom heat dissipation method, and the temperature difference between the bottom and the top of the battery can reach 4-7℃, which will affect the cycle life and operation safety of the battery. Therefore, the research on a new type of energy storage battery module liquid cooling device is of great importance to the development of energy storage industry. SUMMARY

[0004] The utility model provides a kind of liquid cooling device for energy storage battery module in view of the deficiency of prior art.

[0005] The utility model solves the technical scheme as follows for the above technical problem: a kind of liquid cooling device for energy storage battery module, comprising: bottom plate, the bottom plate is provided with refrigerant inlet and refrigerant outlet;Vertical plate is arranged on the bottom plate with predetermined interval, and energy storage battery installation area is formed between adjacent vertical plates;Refrigerant flow channel includes bottom plate flow channel and refrigerant buffer zone opened in the bottom plate, and vertical plate flow channel opened in the vertical plate, the refrigerant inlet and the refrigerant outlet are communicated with the refrigerant buffer zone, and the bottom plate flow channel and the vertical plate flow channel are parallel and both ends are communicated with the refrigerant buffer zone.

[0006] Further, the bottom plate includes lower bottom plate and detachable upper bottom plate which is covered above lower bottom plate, and the upper bottom plate and the lower bottom plate are symmetrically provided with recessed bottom plate flow channel and refrigerant buffer zone;

[0007] The vertical plate includes left vertical plate and detachable right vertical plate which is attached to one side of left vertical plate, and the left vertical plate and the right vertical plate are symmetrically provided with recessed vertical plate flow channel.

[0008] Further, the recess depth D1 of the refrigerant buffer zone is greater than the recess depth D2 of the bottom plate flow channel.

[0009] Furthermore, the relationship between the thickness D3 of the lower base plate, the recess depth D1 of the refrigerant buffer zone, and the recess depth D2 of the base plate flow channel satisfies: D1:D2:D3=(0.75-0.8):(0.6-0.65):1.

[0010] Furthermore, the connection between the bottom plate flow channel and the refrigerant buffer is designed with a rounded corner transition.

[0011] Furthermore, at least one end of the bottom plate flow channel is configured as a curved structure.

[0012] Furthermore, the bottom plate flow channel is divided into a first bottom plate flow channel area, a second bottom plate flow channel area, a third bottom plate flow channel area and a fourth bottom plate flow channel area by several vertical plates, and adjacent bottom plate flow channel areas are connected in series through a refrigerant buffer zone.

[0013] Furthermore, the first bottom plate flow channel area, the second bottom plate flow channel area, the third bottom plate flow channel area and the fourth bottom plate flow channel area each include four bottom plate flow channels. The end of the first bottom plate flow channel area near the refrigerant inlet is the refrigerant inlet end, and the refrigerant inlet end is provided with a pointed protrusion extending toward the refrigerant inlet.

[0014] Furthermore, the four bottom plate flow channels in the first bottom plate flow channel area are grouped in pairs, with one group bending towards the side of the pointed protrusion and the other group bending towards the other side of the pointed protrusion.

[0015] Furthermore, each of the upright plates includes four upright plate flow channels, and the width H1 of the upright plate flow channels is 0.78-0.88 times the width H2 of the bottom plate flow channels.

[0016] The beneficial effects of this utility model are:

[0017] Firstly, the application can limit and protect the adjacent energy storage batteries by setting the vertical plate and the vertical plate flow channel, effectively avoiding damage caused by mutual collision of the energy storage batteries in vibration working conditions. Secondly, the problem of poor overall temperature consistency caused by large temperature difference in the height direction of the battery under the high rate operation condition of the battery module is solved, the service life of the energy storage battery is effectively improved, and the use safety of the energy storage battery is ensured. Finally, by setting the coolant buffer zone, it has multiple functions. Firstly, the coolant flow will be affected by factors such as inlet pressure, flow rate, temperature change and other factors during the flow process, resulting in unstable coolant flow and pressure fluctuation problems. By setting the coolant buffer zone on the flow path of the coolant, the local overheating phenomenon of the energy storage battery caused by unstable flow can be avoided, the flow of the coolant in the subsequent flow channel is ensured to be stable, the heat transfer efficiency is effectively improved, and the excessive wear of the flow channel caused by pressure fluctuation can be avoided, which helps to prolong the service life of the liquid cooling device. Secondly, by setting the coolant buffer zone, the contact area of the coolant and the bottom plate can be increased, thereby increasing the heat exchange area and further improving the heat transfer efficiency and ensuring the heat dissipation performance. Thirdly, the bottom plate flow channel and the vertical plate flow channel cooperate with the coolant buffer zone to realize the synchronous flow of the coolant in the vertical plate flow channel and the bottom plate flow channel, effectively reducing the coolant circulation time and further improving the heat transfer efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A three-dimensional structure schematic diagram of the liquid cooling device provided by the embodiment of the application is installed behind the energy storage battery module.

[0019] Figure 2 A three-dimensional structure schematic diagram of the liquid cooling device provided by the embodiment of the application is installed behind the energy storage battery module.

[0020] Figure 3 A three-dimensional structure schematic diagram of the liquid cooling device provided by the embodiment of the application is installed behind the energy storage battery module.

[0021] Figure 4 An exploded view of the liquid cooling device provided by the embodiment of the application.

[0022] Figure 5 A three-dimensional structure schematic diagram of the lower bottom plate provided by the embodiment of the application.

[0023] Figure 6 A three-dimensional structure schematic diagram of the lower bottom plate provided by the embodiment of the application. Figure 5 An enlarged view of structure A.

[0024] Figure 7 A three-dimensional structure schematic diagram of the right vertical plate provided by the embodiment of the application.

[0025] Reference numerals: 1, bottom plate; 11, refrigerant inlet; 12, refrigerant outlet; 13, positioning block; 14, lower bottom plate; 15, upper bottom plate; 2, vertical plate; 21, left vertical plate; 22, right vertical plate; 3, bottom plate flow channel; 4, refrigerant buffer zone; 5, vertical plate flow channel; 6, first bottom plate flow channel zone; 61, refrigerant entry end; 62, pointed protrusion; 7, second bottom plate flow channel zone; 8, third bottom plate flow channel zone; 9, fourth bottom plate flow channel zone. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application will be described in detail below. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the disclosed specific embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used are only for describing specific embodiments, not for limiting the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment:

[0031] As Figures 1-4The utility model provides a liquid cooling device for energy storage battery, including bottom plate 1, be provided with coolant inlet 11 and coolant outlet 12 on bottom plate 1, and coolant inlet 11 and coolant outlet 12 are connected external coolant storage device, vertical plate 2, a plurality of vertical plate 2 are vertically arranged on bottom plate 1 with predetermined interval, and form energy storage battery installation area between adjacent vertical plate 2, it needs to point out that vertical plate 2 and bottom plate 1 are made of corrosion -resistant stainless steel material and both are with energy storage battery abut, and the both sides of bottom plate 1 upper surface are all fixedly connected with positioning block 13 to fix the position of energy storage battery, vertical plate 2 and bottom plate 1 can be fixed by welding or plug-in fixed, and the embodiment of the application sets up five vertical plate 2, in actual use, the number of vertical plate 2 can be set according to specific use, and it is not limited to the number shown in the application, the interval between adjacent vertical plate 2 can be flexibly set according to the size of energy storage battery, preferably, to improve the heat transfer efficiency, bottom plate 1 and vertical plate 2 and the contact position of energy storage battery are all laid heat-conducting pad, coolant flow channel, including bottom plate flow channel 3 and coolant buffer zone 4 set up in bottom plate 1 and vertical plate flow channel 5 set up in vertical plate 2, coolant inlet 11 and coolant outlet 12 are all communicated with coolant buffer zone 4, bottom plate flow channel 3 and vertical plate flow channel 5 are parallel and both inlet and outlet are communicated with coolant buffer zone 4, it can be understood that during the cooling process, coolant enters coolant buffer zone 4 through coolant inlet 11, then flows through bottom plate flow channel 3 and vertical plate flow channel 5 after gathering in coolant buffer zone 4, then coolant flows out from bottom plate flow channel 3 and vertical plate flow channel 5 to the coolant buffer zone 4 communicated with both outlet ends, then after reversing in coolant buffer zone 4, flows into the next bottom plate flow channel 3 and vertical plate flow channel 5 where the energy storage battery to be cooled is located, until coolant flows out through coolant outlet 12, thus completing a complete cooling process.

[0032] Firstly, the application can limit and protect the adjacent energy storage batteries by setting the vertical plate and vertical plate flow channel, effectively avoiding damage caused by mutual collision of energy storage batteries in vibration working conditions. Secondly, the problem of poor overall temperature consistency caused by large temperature difference in the height direction of the battery under the high rate operating condition of the battery module is solved, effectively improving the service life of the energy storage battery and ensuring the safe use of the energy storage battery. Finally, by setting the coolant buffer zone, it has multiple functions. First, the coolant flow will be affected by factors such as inlet pressure, flow rate, temperature change, etc., resulting in unstable coolant flow and pressure fluctuations. By setting the coolant buffer zone on the flow path of the coolant, it can avoid local overheating of the energy storage battery caused by unstable flow, ensure smooth flow of the coolant in the subsequent flow channel, effectively improve the heat transfer efficiency, and avoid excessive wear of the flow channel caused by pressure fluctuations, which helps to prolong the service life of the liquid cooling device. Secondly, by setting the coolant buffer zone, the contact area between the coolant and the bottom plate can be increased, thereby increasing the heat exchange area and further improving the heat transfer efficiency to ensure the heat dissipation performance. Thirdly, the bottom plate flow channel and the vertical plate flow channel cooperate with the coolant buffer zone to realize the synchronous flow of the coolant in the vertical plate flow channel and the bottom plate flow channel, effectively reducing the coolant circulation time and further improving the heat transfer efficiency.

[0033] Specifically, as shown in Figure 2 、 4 The bottom plate 1 includes a lower bottom plate 14 and an upper bottom plate 15 detachably covering the upper side of the lower bottom plate 14. The upper bottom plate 15 and the lower bottom plate 14 are both symmetrically provided with recessed bottom plate flow channels 3 and coolant buffer zones 4. The vertical plate 2 includes a left vertical plate 21 and a right vertical plate 22 detachably attached to one side of the left vertical plate 21. The left vertical plate 21 and the right vertical plate 22 are both symmetrically provided with recessed vertical plate flow channels 5. It should be noted that the connection between the lower bottom plate 14 and the upper bottom plate 15 and the connection between the left vertical plate 21 and the right vertical plate 22 can be screwed or riveted. Since the specific connection method is a conventional technical means in the art, it will not be described here. Preferably, to improve the sealing performance of the connection, sealing gaskets are provided at the connection between the lower bottom plate 14 and the upper bottom plate 15 and the connection between the left vertical plate 21 and the right vertical plate 22. Through the above setting, it is convenient to periodically check and replace damaged parts, prolong the service life of the overall device, and effectively reduce the processing difficulty. Under the premise of the same thickness of the plate, compared with integral processing, this design can process larger size flow channels to ensure sufficient heat dissipation performance.

[0034] Specifically, as shown in Figure 6As shown, the recess depth D1 of the coolant buffer area 4 is greater than the recess depth D2 of the bottom plate flow channel 3. Through the above setting, a part of the coolant is pre-stored in the coolant buffer area 4, which is beneficial to maintain the heat dissipation effect of the coolant buffer area 4, and can further ensure the synchronous flow of the coolant in the vertical plate flow channel 5 and the bottom plate flow channel 3, and when the coolant flows out from the upper channel to the coolant buffer area, it helps to slow down the coolant in the buffer area, which is beneficial to better conduct heat and further improve the heat exchange efficiency by avoiding the coolant flowing too fast. The existence of the coolant buffer area 4 can also trap larger impurity particles to some extent, preventing them from entering the bottom plate flow channel 3 and the vertical plate flow channel 5. Preferably, the connection between the bottom plate flow channel 3 and the coolant buffer area 4 is provided with a round corner transition. By setting the round corner transition, the flow resistance of the coolant is reduced, so that the coolant can flow smoothly into the bottom plate flow channel 3, avoiding the problem of reduced heat transfer efficiency caused by excessive flow resistance.

[0035] Specifically, as shown in the figure, Figure 6 The relationship between the thickness D3 of the lower bottom plate 14 and the recess depth D1 of the coolant buffer area 4 and the recess depth D2 of the bottom plate flow channel 3 satisfies: D1:D2:D3=(0.75-0.8):(0.6-0.65):1. Through the above size relationship, first, the bottom plate 1 has a certain structural strength to provide sufficient support force to support the energy storage battery, and second, under the premise of ensuring the function of the coolant buffer area 4, it avoids the problem of poor heat dissipation effect caused by the bottom plate flow channel 3 being too thin, and avoids the problem of the coolant being unable to smoothly enter the bottom plate flow channel 3 caused by the height difference between the coolant buffer area 4 and the bottom plate flow channel 3 being too large, ensuring the smooth flow of the coolant in the bottom plate flow channel 3 and ensuring that the liquid cooling device has the best heat dissipation effect.

[0036] Specifically, as shown in the figure, Figures 3-6 Preferably, at least one end of the bottom plate flow channel 3 is provided with a curved structure. Preferably, the inlet end of the bottom plate flow channel 3 is provided with a curved structure. When the coolant flows through the curved part, the change of the flow direction of the coolant will reduce the flow speed, so that the time of the coolant flowing through the bottom plate flow channel 3 is prolonged, which is helpful for fully conducting heat and further improving the heat transfer efficiency. Because the vertical plate flow channel 5 is longer than the bottom plate flow channel 3, by reducing the flow speed of the coolant in the bottom plate flow channel 3, the synchronous flow of the coolant in the vertical plate flow channel 5 and the bottom plate flow channel 3 can be further ensured, avoiding the problem of local flow interruption and poor local heat dissipation effect.

[0037] Specifically, as shown in the figure, Figure 5As shown, the bottom plate flow channel 3 is divided into a first bottom plate flow channel area 6, a second bottom plate flow channel area 7, a third bottom plate flow channel area 8 and a fourth bottom plate flow channel area 9 by a plurality of the vertical plates 2, and adjacent bottom plate flow channel areas are in series through the refrigerant buffer area 4. It should be pointed out that one end of the first bottom plate flow channel area 6 is connected to the refrigerant inlet 11 through the refrigerant buffer area 4, and one end of the fourth bottom plate flow channel area 9 is connected to the refrigerant outlet 12 through the refrigerant buffer area 4. Through this arrangement, the flow channel can be reasonably divided, and the refrigerant can be ensured to flow smoothly through each flow channel area, avoiding the problem of refrigerant flow interruption caused by the refrigerant input speed being unable to match due to excessive bottom plate flow channel 3.

[0038] Specifically, as shown in the figure, Figure 5 The first bottom plate flow channel area 6, the second bottom plate flow channel area 7, the third bottom plate flow channel area 8 and the fourth bottom plate flow channel area 9 each include 4 bottom plate flow channels 3. By arranging 4 flow channels, the heat dissipation effect is ensured, and sufficient structural strength is also ensured. Among them, one end of the first bottom plate flow channel area 6 close to the refrigerant inlet 11 is a refrigerant inlet end 61, the refrigerant inlet end 61 is provided with a sharp protrusion 62 extending towards the refrigerant inlet 11, and the 4 bottom plate flow channels 3 of the first bottom plate flow channel area 6 are arranged in two groups, one group is bent towards one side of the sharp protrusion 62, and the other group is bent towards the other side of the sharp protrusion 62. By arranging the sharp protrusion 62, the guiding and shunting effect can be achieved. When the refrigerant enters the refrigerant buffer area 4 through the refrigerant inlet 11, the refrigerant is guided and shunted to both sides by the sharp protrusion 62, so that the refrigerant can quickly enter the vertical plate flow channel 5 on both sides, and by bending the bottom plate flow channel 3 in groups, the refrigerant on both sides can be further ensured to enter the bottom plate flow channel 3 faster to shorten the heat dissipation cycle period, and the refrigerant in the four bottom plate flow channels 3 can be ensured to flow synchronously, reducing the probability of local refrigerant flow interruption caused by uneven refrigerant shunting at the inlet.

[0039] Specifically, as shown in the figure, Figures 5-7As shown, each of the vertical plates 2 comprises four vertical plate flow channels 5, and the width H1 of the vertical plate flow channels 5 is 0.78-0.88 times the width H2 of the bottom plate flow channels 3. The above parameters are very critical. If the width H1 of the vertical plate flow channels 5 is less than 0.78 times the width H2 of the bottom plate flow channels 3, the vertical plate flow channels 5 are too thin, resulting in poor heat dissipation effect, which is not suitable for high rate operation of the energy storage battery module. If the width H1 of the vertical plate flow channels 5 is greater than 0.88 times the width H2 of the bottom plate flow channels 3, although the heat dissipation effect is ensured, the simultaneous flow of the coolant in the vertical plate flow channels 5 and the bottom plate flow channels 3 cannot be realized, and the problem of local coolant flow interruption occurs. Only when the width H1 of the vertical plate flow channels 5 is 0.78-0.88 times the width H2 of the bottom plate flow channels 3, the problem of local coolant flow interruption is avoided under the premise of ensuring the heat dissipation effect, and the heat transfer efficiency is further improved.

[0040] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not listed, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0041] For those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the scope of the present application. The scope of the present application is subject to the appended claims.

Claims

1. A liquid cooling device for an energy storage battery module, characterized in that, include: A base plate, wherein a refrigerant inlet and a refrigerant outlet are provided on the base plate; A plurality of the uprights are vertically arranged on the base plate at predetermined intervals, and an energy storage battery installation area is formed between adjacent uprights; The refrigerant flow channel includes a bottom plate flow channel and a refrigerant buffer zone formed in the bottom plate, and a vertical plate flow channel formed in the vertical plate. The refrigerant inlet and refrigerant outlet are both connected to the refrigerant buffer zone. The bottom plate flow channel and the vertical plate flow channel are connected in parallel, and their inlet and outlet ends are both connected to the refrigerant buffer zone.

2. The liquid cooling device for an energy storage battery module according to claim 1, characterized in that, The base plate includes a lower base plate and a detachable upper base plate that covers the lower base plate. Both the upper base plate and the lower base plate are symmetrically provided with recessed base plate channels and refrigerant buffer zones. The upright plate includes a left upright plate and a detachable right upright plate attached to one side of the left upright plate. Both the left and right upright plates are symmetrically provided with recessed upright plate channels.

3. A liquid cooling device for an energy storage battery module according to claim 2, characterized in that, The recess depth D1 of the refrigerant buffer zone is greater than the recess depth D2 of the bottom plate flow channel.

4. A liquid cooling device for an energy storage battery module according to claim 3, characterized in that, The relationship between the thickness D3 of the lower base plate, the recess depth D1 of the refrigerant buffer zone, and the recess depth D2 of the base plate flow channel satisfies: D1:D2:D3=(0.75-0.8):(0.6-0.65):

1.

5. A liquid cooling device for an energy storage battery module according to claim 3, characterized in that, The connection between the bottom plate flow channel and the refrigerant buffer zone is designed with a rounded corner transition.

6. A liquid cooling device for an energy storage battery module according to claim 1, characterized in that, At least one end of the bottom plate flow channel is configured as a curved structure.

7. A liquid cooling device for an energy storage battery module according to claim 6, characterized in that, The bottom plate flow channel is divided into a first bottom plate flow channel area, a second bottom plate flow channel area, a third bottom plate flow channel area and a fourth bottom plate flow channel area by several vertical plates, and adjacent bottom plate flow channel areas are connected in series through a refrigerant buffer zone.

8. A liquid cooling device for an energy storage battery module according to claim 7, characterized in that, The first bottom plate flow channel area, the second bottom plate flow channel area, the third bottom plate flow channel area and the fourth bottom plate flow channel area each include four bottom plate flow channels. The end of the first bottom plate flow channel area near the refrigerant inlet is the refrigerant inlet end, and the refrigerant inlet end is provided with a pointed protrusion extending toward the refrigerant inlet.

9. A liquid cooling device for an energy storage battery module according to claim 8, characterized in that, The four bottom plate flow channels in the first bottom plate flow channel area are arranged in pairs, with one pair bending towards the side of the pointed protrusion and the other pair bending towards the other side of the pointed protrusion.

10. A liquid cooling device for an energy storage battery module according to claim 8, characterized in that, Each of the upright plates includes four upright plate flow channels, and the width H1 of the upright plate flow channels is 0.78-0.88 times the width H2 of the bottom plate flow channels.

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