Battery module liquid cooling system

Abstract

The utility model provides a liquid cooling system for a battery module, which comprises a box body comprising a frame and a bearing plate, and the frame and the bearing plate are connected to form a semi-closed space; the battery module is arranged in the semi-closed space of the box body; the liquid cooling pipeline is arranged on the bearing plate; the temperature equalizing pipe is arranged on the bearing plate, and the side wall of the temperature equalizing pipe is attached to the side wall of the liquid cooling pipeline; wherein the liquid cooling pipeline and the temperature equalizing pipe are positioned at the bottom of the battery module and are in contact with the bottom of the battery module. According to the utility model, by arranging the liquid cooling pipeline and the temperature equalizing pipe which is in contact with the liquid cooling pipeline in an attached manner, the flow of the cooling liquid is increased, the flow resistance is effectively reduced, and the attached contact area with the bottom of the battery module is increased, so that the heat of the battery module can be transmitted out more uniformly, and a better cooling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to a battery module liquid cooling system. Background Art

[0002] With the vigorous development of the energy storage industry, the competition in the energy storage industry is becoming increasingly fierce, and the requirements for energy storage technology are becoming higher and higher. The battery module system is the core component of energy storage products, and its most important technical core is how to effectively manage heat. During the operation process, the battery will continuously release heat, forming heat accumulation, which will bring hidden dangers to the safe use of the battery. In order to ensure the safe and effective operation of the battery, some effective means must be used to remove the heat generated by the battery to prevent heat accumulation.

[0003] At present, the main heat dissipation methods for energy storage batteries are air cooling and liquid cooling, and the liquid cooling system has gradually become the mainstream cooling method for energy storage products due to its advantages such as good heat dissipation effect and small space occupation. However, the relevant liquid cooling technology has problems such as complex liquid cooling channels, small coolant flow, and large flow resistance, which leads to poor consistency of battery temperature field, inability to effectively cool the battery evenly, and inability to ensure safe operation of the battery. Utility Model Content

[0004] In view of the above-mentioned deficiencies, the purpose of the utility model is to provide a battery module liquid cooling system, which increases the coolant flow rate and effectively reduces the flow resistance. The heat of the battery module can be transferred more evenly, thereby achieving a better cooling effect.

[0005] The present invention provides a battery module liquid cooling system, comprising:

[0006] A box body, the box body comprising a frame and a load-bearing plate, the frame and the load-bearing plate are connected to form a semi-enclosed space;

[0007] A battery module, wherein the battery module is arranged in a semi-enclosed space of the box;

[0008] A liquid cooling pipe, wherein the liquid cooling pipe is arranged on the load-bearing plate;

[0009] A temperature-averaging pipe, wherein the temperature-averaging pipe is arranged on the load-bearing plate, and the side wall of the temperature-averaging pipe is in contact with the side wall of the liquid-cooling pipe;

[0010] Wherein, the liquid cooling pipe and the temperature equalizing pipe are both located at the bottom of the battery module and are in contact with the bottom of the battery module.

[0011] Furthermore, the liquid cooling pipe is bent multiple times to form a plurality of straight flow channels and a plurality of curved flow channels, each of the straight flow channels is arranged parallel to the length direction of the box body, the plurality of straight flow channels are arranged at intervals with each other in the width direction of the box body, the plurality of curved flow channels are located at both ends of the length direction of the box body, and each of the curved flow channels connects two adjacent straight flow channels.

[0012] Furthermore, there are a plurality of the temperature-averaging tubes, each of which is disposed in the interval between two adjacent straight flow channels, and the side walls on both sides of each of the temperature-averaging tubes are respectively fitted with the side walls of the two adjacent straight flow channels.

[0013] Furthermore, a heat-conducting gel is provided between any side wall of each of the temperature-averaging tubes and the side wall of the adjacent linear flow channel, and the side walls of the two are bonded together through the heat-conducting gel.

[0014] Furthermore, the upper surface of each of the linear flow channels and the upper surface of each of the temperature-averaging tubes are flush with each other, and the upper surface of each of the linear flow channels and the upper surface of each of the temperature-averaging tubes are in contact with the bottom of the battery module.

[0015] Furthermore, the battery module liquid cooling system also includes a thermally conductive gel, which is adhered between the bottom of the battery module and the upper surface of each of the linear flow channels and the upper surface of each of the temperature balancing tubes.

[0016] Furthermore, the liquid cooling pipe is fixed to the load-bearing plate by means of structural fixing glue.

[0017] Furthermore, the temperature-averaging pipe is fixed to the load-bearing plate by means of a fixing piece or a structural fixing adhesive.

[0018] Furthermore, the cross-section of the liquid cooling pipe is square.

[0019] Furthermore, the cross section of the temperature equalizing tube is square.

[0020] The battery module liquid cooling system provided in this embodiment has the following beneficial effects:

[0021] (1) The cross section of the liquid cooling pipe is square, which can effectively increase the flow rate of the coolant in the liquid cooling pipe; at the same time, when the square tube liquid cooling pipe contacts the battery module, the contact area between the liquid cooling pipe and the battery module will be increased, which is beneficial for the liquid cooling pipe to dissipate heat from the battery module;

[0022] (2) The liquid cooling pipeline is simplified and formed by bending, which reduces the processing difficulty of the flow channel and reduces the production cost;

[0023] (3) The temperature-averaging tube cooperates with the liquid cooling pipe to achieve the effect of temperature equalization; at the same time, the temperature-averaging tube can assist in fixing and positioning the liquid cooling pipe, bear the weight of the battery module, and play a supporting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a structural schematic diagram of the battery module liquid cooling system in an embodiment of the utility model.

[0026] Figure 2 for Figure 1 Schematic diagram of the battery module liquid cooling system.

[0027] Figure 3 for Figure 2 A partial enlarged schematic diagram of a in the figure.

[0028] Figure 4 for Figure 2 A partial enlarged schematic diagram of b. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] like Figures 1 to 4As shown, an embodiment of the utility model provides a battery module liquid cooling system, including a box body 10, a battery module 20, a liquid cooling pipe 30 and a temperature equalizing pipe 40.

[0032] The box body 10 includes a frame 11 and a load-bearing plate 12, and the frame 11 and the load-bearing plate 12 are connected to form a semi-enclosed space. In this embodiment, the frame 11 and the load-bearing plate 12 are separately arranged, so that it is convenient to arrange the liquid cooling pipe 30 and the temperature averaging pipe 40 (such as Figure 4 As shown), the load-bearing plate 12 is then fixed to the bottom of the frame 11 by a fixing member. In the actual production process, the load-bearing plate 12 can be fixed to the frame 11 by FDS screws (not shown).

[0033] The battery module 20 is disposed in the semi-enclosed space of the box 10. In this embodiment, the bottom end of the battery module 20 is contained in the semi-enclosed space, and the top end of the battery module 20 is exposed outside the box 10. In other embodiments, if the height of the box 10 is large enough, the entire battery module 20 may be contained in the semi-enclosed space.

[0034] The liquid cooling pipe 30 is arranged on the load-bearing plate 12 and is used to cool the battery module 20. A coolant (not shown) is arranged in the liquid cooling pipe 30. The coolant can be water or other medium, and the heat of the battery module 20 is taken away by circulating the coolant. The cross-section of the liquid cooling pipe 30 is square, which can effectively increase the fitting contact area with the load-bearing plate 12 and the bottom of the battery module 20, increase the fitting contact area with the temperature equalizing tube 40, and increase the flow rate of the coolant in the liquid cooling pipe 30, thereby effectively improving the cooling effect. In particular, when the square tube-shaped liquid cooling pipe 30 contacts the bottom of the battery module 20, the contact area between the liquid cooling pipe 30 and the battery module 20 will be increased, which is beneficial for the liquid cooling pipe 30 to dissipate heat from the battery module 20.

[0035] The temperature-averaging tube 40 is arranged on the load-bearing plate 12, and the side wall of the temperature-averaging tube 40 is in contact with the side wall of the liquid cooling pipe 30. The temperature-averaging tube 40 has three main functions: first, it is in close contact with the liquid cooling pipe 30, so as to achieve the temperature-averaging effect; second, it is to position and fix the liquid cooling pipe 30; third, it can bear the weight of the battery module 20, play a supporting role, and then protect the liquid cooling pipe 30 from deformation. The cross-section of the temperature-averaging tube 40 is square, which can effectively increase the contact area with the load-bearing plate 12 and the bottom of the battery module 20, and increase the contact area with the liquid cooling pipe 30, thereby effectively improving the temperature-averaging effect.

[0036] The liquid cooling pipe 30 and the temperature equalizing pipe 40 are both located at the bottom of the battery module 20 and are in contact with the bottom of the battery module 20. On the one hand, the liquid cooling pipe 30 is in contact with the bottom of the battery module 20, so that the heat of the battery module 20 can be continuously taken away in time by the coolant in the liquid cooling pipe 30. On the other hand, the temperature equalizing pipe 40 is in contact with the bottom of the battery module 20, thereby increasing the contact area with the bottom of the battery module 20. At the same time, the temperature equalizing pipe 40 is also in contact with the side wall of the liquid cooling pipe 30. The heat of the battery module 20 can also be transferred through the temperature equalizing pipe 40, that is, it is transferred to the liquid cooling pipe 30 through the temperature equalizing pipe 40, so that the heat of the battery module 20 can be transferred more evenly, thereby preventing heat from gathering in a local position (that is, a position not in contact with the liquid cooling pipe 30), thereby improving the overall cooling effect of the battery module 20.

[0037] In this embodiment, the liquid cooling pipe 30 is fixed to the load-bearing plate 12 by means of the structural fixing glue 120, so as to prevent the liquid cooling pipe 30 from moving on the load-bearing plate 12. In addition, the structural fixing glue 120 is also conducive to transferring the heat of the liquid cooling pipe 30 to the load-bearing plate 12, and the load-bearing plate 12 can also play a role in assisting heat dissipation. In other embodiments, the liquid cooling pipe 30 can also be fixed to the load-bearing plate 12 by other means such as locking or buckling.

[0038] The liquid cooling pipe 30 has two openings at both ends, one for the liquid inlet and the other for the liquid outlet, and each opening is connected to the pipe joint 32 through the pipe connector 31. Preferably, the liquid cooling pipe 30 and the pipe connector 31 are both made of aluminum and can be sealed by seamless welding. The pipe joint 32 is made of stainless steel, and the liquid cooling pipe 30, the pipe connector 31 and the pipe joint 32 are assembled by extrusion.

[0039] A sealing strip 121 is provided on one side of the upper surface of the load-bearing plate 12, and the pipe joints 32 are fixed on both sides of the sealing strip 121. In this embodiment, a notch (not shown) is provided at the position of the frame 11 corresponding to the pipe joint 32, for the pipe joint 32 to pass through. The side of the frame 11 corresponding to the sealing strip 121 is in contact with the sealing strip 121.

[0040] Specifically, Figure 2 The liquid cooling pipe 30 is in a bent shape. The liquid cooling pipe 30 is bent multiple times to form a plurality of straight flow channels 301 and a plurality of curved flow channels 302. Each straight flow channel 301 is arranged parallel to the length direction of the box body 10. The plurality of straight flow channels 301 are arranged at intervals in the width direction of the box body 10. The plurality of curved flow channels 302 are distributed at both ends of the length direction of the box body 10, and each curved flow channel 302 connects two adjacent straight flow channels 301. Specifically, each curved flow channel 302 is C-shaped.

[0041] By bending the liquid cooling pipe 30 to form a plurality of straight flow channels 301, and connecting the plurality of straight flow channels 301 using a plurality of curved flow channels 302, the overall length of the liquid cooling pipe 30 and the fitting contact area with the battery module 20 are effectively increased, so that the liquid cooling pipe 30 can better match the battery module 20, which is beneficial to the effective thermal management of the battery module 20, so that the heat of the battery module 20 can be dissipated in time and the temperature consistency can be maintained.

[0042] In the prior art, the liquid cooling pipe 30 is usually made by sheet metal stamping and welding. The production process is relatively complicated by this method. In this embodiment, the liquid cooling pipe 30 is formed by bending, which reduces the processing difficulty of the flow channel and reduces the production cost.

[0043] Specifically, there are multiple temperature-averaging tubes 40, each of which is arranged parallel to the length direction of the box 10, and each of which is arranged in the interval between two adjacent linear channels 301, and the side walls on both sides of each temperature-averaging tube 40 are respectively in contact with the side walls of the two adjacent linear channels 301. The upper surface of each linear channel 301 and the upper surface of each temperature-averaging tube 40 are flush with each other, and the upper surface of each linear channel 301 and the upper surface of each temperature-averaging tube 40 are in contact with the bottom of the battery module 20.

[0044] Optionally, a thermal conductive gel (not shown) is provided between any side wall of each temperature-averaging tube 40 and the side wall of the adjacent straight flow channel 301, and the two side walls are bonded together through the thermal conductive gel to reduce the thermal resistance between the temperature-averaging tube 40 and the straight flow channel 301 and improve the heat conduction efficiency between the two.

[0045] In the actual production process, the temperature-averaging pipe 40 can be first fixed on the load-bearing plate 12 so that the temperature-averaging pipe 40 plays an auxiliary positioning role and facilitates the installation and fixation of the liquid cooling pipe 30.

[0046] The material used for the temperature-averaging tube 40 is aluminum. The temperature-averaging tube 40 can be fixed to the load-bearing plate 12 by a fixing member to prevent the temperature-averaging tube 40 from moving on the load-bearing plate 12. Specifically, a blind hole nut is riveted in the cavity of the temperature-averaging tube 40, and the temperature-averaging tube 40 passes through the load-bearing plate 12 through a screw (not shown) and interlocks with the blind hole nut to lock the temperature-averaging tube 40 on the load-bearing plate 12. In other embodiments, the temperature-averaging tube 40 can also be fixed to the load-bearing plate 12 by a structural fixing glue (not shown). In addition, the structural fixing glue is also conducive to transferring the heat of the temperature-averaging tube 40 to the load-bearing plate 12.

[0047] The energy storage battery module liquid cooling system also includes a thermally conductive gel 50, which is pasted between the bottom of the battery module 20 and the upper surface of each linear flow channel 301 and the upper surface of each temperature equalizing tube 40 to play a role in insulation and heat conduction.

[0048] The thermally conductive gel 50 can be provided as a whole piece according to actual conditions or multiple pieces according to the number and shape of the battery pack. In this embodiment, two pieces of the thermally conductive gel 50 are provided.

[0049] The battery module 20 includes a plurality of batteries 21, an end plate 22 and a partition 23. The plurality of batteries 21 are arranged in sequence to form a battery pack. Two end plates 22 are respectively arranged at both ends of the battery pack, and the ends of the battery pack are separated from the end plates 22 by the partition 23. The battery pack and the end plates 22 are bundled and packaged by a cable tie. The partition 23 plays a certain role of insulation and buffer protection between the end plates 22 and the batteries 21.

[0050] Preferably, the cable tie is a steel cable tie. The battery module 20 also includes a CCS (not shown) and a protection plate 25. The CCS is welded to the ear pole of the battery 21 and is electrically connected to the battery 21. The protection plate 25 is arranged on the top of the battery pack for electrical protection to prevent foreign objects from entering and electrical short circuits. The main function of the energy storage and collection integrated busbar (CCS) is to concentrate the energy output of energy storage devices (such as battery packs, supercapacitors, etc.) onto an integrated busbar for effective management and distribution of energy.

[0051] The frame 11 includes an outer frame 111, a fixed beam 112 and a reinforcing beam 113. The fixed beam 112 and the reinforcing beam 113 are arranged perpendicular to each other. The fixed beam 112 and the reinforcing beam 113 are both fixed in the outer frame 111. The fixed beam 112 and the reinforcing beam 113 are effectively connected by seamless welding.

[0052] In this embodiment, one end portion of the reinforcing beam 113 is vertically fixed to the middle portion of the fixing beam 112 , mainly serving to strengthen the structure.

[0053] In this embodiment, the battery module 20 is fixed to the frame 11 by bolts.

[0054] In this embodiment, the load-bearing plate 12 is made of high-strength carbon steel to provide strong support. In other embodiments, the load-bearing plate 12 may be made of other materials with strong support.

[0055] The battery module liquid cooling system provided in this embodiment has the following beneficial effects:

[0056] (1) The cross section of the liquid cooling pipe 30 is square, which can effectively increase the flow rate of the coolant in the liquid cooling pipe 30; at the same time, when the square tube liquid cooling pipe 30 contacts the battery module 20, the contact area between the liquid cooling pipe 30 and the battery module 20 will be increased, which is beneficial for the liquid cooling pipe 30 to dissipate heat from the battery module 20;

[0057] (2) The temperature-averaging tube 40 cooperates with the liquid cooling pipe 30 to achieve the effect of temperature uniformity; at the same time, the temperature-averaging tube 40 can assist in fixing and positioning the liquid cooling pipe 30 and play a supporting role by bearing the weight of the battery module 20.

[0058] (3) The liquid cooling pipe 30 is formed by multiple bending steps, which reduces the processing difficulty of the flow channel and reduces the production cost.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module liquid cooling system, characterized in that: include: A box body (10), the box body (10) comprising a frame (11) and a load-bearing plate (12), the frame (11) and the load-bearing plate (12) being connected to form a semi-enclosed space; A battery module (20), wherein the battery module (20) is arranged in a semi-enclosed space of the box (10); A liquid cooling pipe (30), wherein the liquid cooling pipe (30) is arranged on the load-bearing plate (12); A temperature-averaging pipe (40), wherein the temperature-averaging pipe (40) is arranged on the load-bearing plate (12), and a side wall of the temperature-averaging pipe (40) is in contact with a side wall of the liquid-cooling pipe (30); The liquid cooling pipe (30) and the temperature equalizing pipe (40) are both located at the bottom of the battery module (20), and are both in contact with the bottom of the battery module (20).

2. The battery module liquid cooling system according to claim 1, characterized in that: The liquid cooling pipe (30) is bent multiple times to form a plurality of straight flow channels (301) and a plurality of curved flow channels (302); each of the straight flow channels (301) is arranged parallel to the length direction of the box body (10); the plurality of straight flow channels (301) are arranged at intervals from each other in the width direction of the box body (10); the plurality of curved flow channels (302) are located at both ends of the length direction of the box body (10), and each of the curved flow channels (302) connects two adjacent straight flow channels (301).

3. The battery module liquid cooling system according to claim 2, characterized in that: There are a plurality of the temperature-averaging tubes (40), each of which is arranged in the interval between two adjacent straight flow channels (301), and the side walls on both sides of each of the temperature-averaging tubes (40) are respectively fitted with the side walls of the two adjacent straight flow channels (301).

4. The battery module liquid cooling system according to claim 3, characterized in that: A heat-conducting gel (50) is provided between any side wall of each temperature-averaging tube (40) and the side wall of the adjacent straight flow channel (301), and the side walls of the two are bonded together via the heat-conducting gel (50).

5. The battery module liquid cooling system according to claim 3, characterized in that: The upper surface of each of the linear flow channels (301) and the upper surface of each of the temperature-averaging tubes (40) are flush with each other, and the upper surface of each of the linear flow channels (301) and the upper surface of each of the temperature-averaging tubes (40) are in contact with the bottom of the battery module (20).

6. The battery module liquid cooling system according to claim 5, characterized in that: The battery module liquid cooling system further comprises a heat conductive gel (50), wherein the heat conductive gel (50) is adhered between the bottom of the battery module (20) and the upper surface of each of the linear flow channels (301) and the upper surface of each of the temperature equalizing tubes (40).

7. The battery module liquid cooling system according to claim 1, characterized in that: The liquid cooling pipe (30) is fixed to the load-bearing plate (12) by means of structural fixing glue.

8. The battery module liquid cooling system according to claim 1, characterized in that: The temperature-averaging pipe (40) is fixed to the load-bearing plate (12) via a fixing piece or a structural fixing adhesive.

9. The battery module liquid cooling system according to any one of claims 1 to 8, characterized in that: The cross section of the liquid cooling pipe (30) is square.

10. The battery module liquid cooling system according to any one of claims 1 to 8, characterized in that: The cross section of the temperature equalizing tube (40) is square.

Images