Battery module heat dissipation system

Abstract

The utility model provides a battery module heat dissipation system which comprises a top heat dissipation structure and a bottom heat dissipation structure, the top heat dissipation structure comprises a heat dissipation cover plate, and a plurality of heat dissipation fins are arranged at the top end of the heat dissipation cover plate; the bottom heat dissipation structure comprises a liquid cooling plate, a plurality of sets of flow channels which are connected in parallel are arranged in the liquid cooling plate, a water inlet and a water outlet of the liquid cooling plate are communicated through the multiple sets of flow channels which are connected in parallel, and throttling check blocks are arranged in the flow channels. Through the arrangement of the top heat dissipation structure and the bottom heat dissipation structure, the temperature gradient easily generated by the battery module in the height direction is reduced, the top heat dissipation structure dissipates heat through the heat dissipation fins, the bottom heat dissipation structure dissipates heat through a plurality of groups of flow channels which are connected in parallel in the liquid cooling plate, and throttling stop blocks are arranged in the flow channels, so that the heat dissipation efficiency is improved. Therefore, the overall flow distribution is adjusted, the flow at the bottom of each group of flow channels is ensured to be consistent, the temperature of each group of flow channels is ensured to be consistent, the internal temperature difference of each flow channel is reduced, and the heat dissipation uniformity among the areas of the battery module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery module heat dissipation, and particularly relates to a battery module heat dissipation system. Background Art

[0002] With the rapid development of the energy storage industry, lithium battery chemical energy storage has gradually become the main energy storage method. As the core component, the battery module often generates a large amount of heat during the charging and discharging process, which destroys the consistency of the battery and may bring safety risks in severe cases.

[0003] Regarding the heat dissipation problem of the battery module, the heat dissipation method commonly used in the existing technology is to add a liquid cooling plate or liquid cooling pipeline in the battery module, and use the liquid cooling plate or liquid cooling pipeline to directly contact the battery cells to dissipate heat from the battery. However, the area of the liquid cooling plate is large, and multiple flow channels are arranged inside, which is easy to cause uneven flow distribution, resulting in a temperature difference between each flow channel, causing uneven heat dissipation in each area of the battery. Moreover, the liquid cooling plate or liquid cooling pipeline is arranged at the bottom of the battery cell, and the battery cell has a certain height, so there will be a temperature gradient in the height direction of the battery cell, resulting in a lower temperature at the bottom surface of the battery cell and the highest temperature at the top of the battery cell, and the temperature distribution of the entire battery cell is uneven, which will affect the service life and performance of the battery cell after long-term use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery module heat dissipation system to achieve efficient heat dissipation of the battery module.

[0005] The utility model provides a battery module heat dissipation system, which includes a top heat dissipation structure and a bottom heat dissipation structure. The top heat dissipation structure includes a heat dissipation cover plate, and multiple heat dissipation fins are arranged at the top end of the heat dissipation cover plate; the bottom heat dissipation structure includes a liquid cooling plate, and multiple groups of flow channels connected in parallel are arranged inside the liquid cooling plate. The water inlet and outlet of the liquid cooling plate are connected through multiple groups of flow channels connected in parallel, and a throttling block is arranged in the flow channel.

[0006] Further, the bottom heat dissipation structure further includes a box body frame and multiple guard plates. The multiple guard plates are sequentially fixedly installed along the length direction of the box body frame, and the liquid cooling plate is fixedly installed between the box body frame and the guard plates.

[0007] Further, the box body frame includes a ring beam frame. Along the length direction of the inner side of the ring beam frame, a first support beam, a second support beam, and a third support beam are sequentially arranged, and threaded holes are opened on the first support beam, the second support beam, and the third support beam.

[0008] Further, installation holes are opened at the edges of the guard plates, and the ring beam frame and the guard plates are fixedly connected by bolts.

[0009] Further, each of the guard plates is provided with stamping ribs.

[0010] Further, the liquid cooling plate includes an upper cooling plate and a lower cooling plate that are attached to each other. The flow channels are provided on the lower cooling plate, and nozzles corresponding to the water inlet and the water outlet are provided on the upper cooling plate.

[0011] Further, the upper cooling plate is hermetically connected to the bottom end of the box frame.

[0012] Further, the throttle block is circular or oblong, and the throttle block is a stamping protrusion on the lower cooling plate.

[0013] Further, a PTC heating sheet is provided in each group of the flow channels. Threading holes are provided on the lower cooling plate at positions corresponding to each flow channel. The power cord of the PTC heating sheet passes through the threading holes and is connected to an external power supply.

[0014] Further, an exhaust channel is provided at the top end of the heat dissipation cover plate.

[0015] The beneficial effects of this technical solution compared with the prior art are as follows: By respectively arranging a top heat dissipation structure and a bottom heat dissipation structure at the top and bottom of the battery module, the temperature gradient that is likely to occur in the height direction of the battery module is reduced. The top heat dissipation structure dissipates heat through the heat dissipation fins at the top end of the heat dissipation cover plate, and the bottom heat dissipation structure dissipates heat by arranging multiple groups of flow channels connected in parallel inside the liquid cooling plate. A throttle block is arranged in the flow channels to prevent excessive local flow, thereby adjusting the overall flow distribution, ensuring that the flow at the bottom of each group of flow channels is consistent, ensuring that the temperature of each group of flow channels is consistent, reducing the internal temperature difference of each flow channel, and ensuring the uniformity of heat dissipation between different regions of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a disassembled structural schematic diagram of the top heat dissipation structure and the bottom heat dissipation structure in the present invention.

[0018] Figure 2 It is a bottom structural schematic diagram of the liquid cooling plate in the present invention.

[0019] Figure 3 For the present invention Figure 1 a structural schematic diagram of the position A.

[0020] Description of the reference numerals: 1 - Bottom heat dissipation structure, 2 - Top heat dissipation structure, 3 - Heat dissipation cover plate, 4 - Heat dissipation fins, 5 - Exhaust passage, 6 - Ring beam frame, 7 - First support beam, 8 - Second support beam, 9 - Third support beam, 10 - Upper cold plate, 11 - Lower cold plate, 12 - Protective plate, 13 - Water inlet nozzle, 14 - Water outlet nozzle, 15 - Throttle block, 16 - PTC heating element. Detailed implementation manners

[0021] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Embodiment 1

[0025] As Figures 1-3As shown in the figure, the utility model aims to provide a battery module heat dissipation system, which includes a top heat dissipation structure 2 and a bottom heat dissipation structure 1. The top heat dissipation structure 2 includes a heat dissipation cover plate 3. A heat conduction structural adhesive is filled between the heat dissipation cover plate 3 and the top end of the battery module. The heat dissipation cover plate 3 is made of high-strength insulating and heat-conducting plastic. For example, the material is: based on PP, with 5% aluminum fiber filled inside, having the advantages of high structural strength, high insulation strength, and good heat-conducting performance. The heat conduction coefficient can reach more than 2W / m.k and can be injection molded. The heat dissipation cover plate 3 is installed on the top of the battery module. Multiple heat dissipation fins 4 are provided at the top end of the heat dissipation cover plate 3 to increase the heat dissipation area of the heat dissipation cover plate 3 and improve the heat dissipation efficiency. At the same time, the heat dissipation fins 4 also strengthen the stiffness of the heat dissipation cover plate 3, ensure that the heat dissipation cover plate 3 fits tightly with the top end of the battery module, improve the ability to resist heat deformation, and ensure the heat dissipation efficiency.

[0026] An exhaust channel 5 is provided at the top end of the heat dissipation cover plate 3, corresponding to the explosion-proof valve opening at the top of the battery cell. When a thermal runaway occurs in the battery cell, the gas generated inside the battery cell enters the exhaust channel 5 inside the heat dissipation cover plate 3 through the explosion-proof valve opening. The exhaust channel 5 is connected to the explosion-proof valve of the battery cell. When the internal air pressure is greater than 4KPa, the explosion-proof valve opens to quickly discharge the internal gas, so as to reduce the content of internal combustible gas and prevent the battery module from catching fire and exploding. Aerogel thermal insulation is laid inside and on the inner side of the exhaust channel 5 of the heat dissipation cover plate 3 to prevent the heat dissipation cover plate 3 from melting and cracking due to the high temperature of the thermal runaway of the battery cell.

[0027] The bottom heat dissipation structure 1 includes a liquid cooling plate. The liquid cooling plate includes an upper cooling plate 10 and a lower cooling plate 11 that are mutually attached. The upper cooling plate 10 is a flat plate. Brazing is used between the upper cooling plate 10 and the lower cooling plate 11. Flow channels are provided on the lower cooling plate 11. Water nozzles corresponding to the water inlet and outlet are provided on the upper cooling plate 10. The inlet and outlet nozzles 14, the upper cooling plate 10, and the lower cooling plate 11 form a closed flow channel through brazing. The coolant enters from the water inlet nozzle 13, flows through the flow channels of the liquid cooling plate, and flows out from the water outlet nozzle 14. Multiple groups of mutually parallel flow channels are provided inside the liquid cooling plate. The water inlet and outlet of the liquid cooling plate are connected through multiple groups of mutually parallel flow channels. Specifically, the design is that the coolant enters from the water inlet, is divided into the first group of flow channels to the third group of flow channels, and then is merged in parallel into the fourth group of flow channels, and then flows out from the water outlet. Part of the flow channels serve as return water flow channels. Throttle blocks 15 are provided in the flow channels. The throttle blocks 15 are circular or long-waisted stamping protrusions on the lower cooling plate 11. By blocking the flow of the coolant, the throttle blocks 15 are used to prevent excessive local flow, so as to adjust the overall flow distribution, ensure that the flow at the bottom of each group of flow channels is consistent, ensure that the temperature of each group of flow channels is consistent, and reduce the internal temperature difference of each flow channel.

[0028] The bottom heat dissipation structure 1 further includes a box body frame and a plurality of guard plates 12. The plurality of guard plates 12 are fixedly installed in sequence along the length direction of the box body frame. The liquid cooling plate is fixedly installed between the box body frame and the guard plates 12. The upper cold plate 10 is connected to the bottom end of the box body frame by caulking and sealing. The guard plates 12 are formed by stamping and can be high-strength hot-formed steel. The bottom guard plates 12 are pre-opened with mounting holes and are bolted and fixed to the ring beam frame 6. And each guard plate 12 is provided with stamping ribs for strengthening the strength of the guard plate 12. Among them: The box body frame includes a ring beam frame 6. The cross-section of the ring beam frame 6 is roll-formed to form a frame beam and is formed into a ring beam frame 6 by bending. When the ring beam frame 6 is roll-formed, the cross-section is connected and fixed by resistance welding and laser welding, and the cross-section is in a Japanese character shape. After bending and forming, the butt welds of the ring beam frame 6 are connected and fixed by laser welding; Along the length direction of the inner side of the ring beam frame 6, a first support beam 7, a second support beam 8, and a third support beam 9 for supporting the battery module are sequentially provided. The first and third support beams 9 are formed by roll-forming, and the cross-section is in a square shape, and the cross-section is welded into a square shape by laser welding; The second support beam 8 is formed by roll-forming, and the cross-section is in a convex shape, and the welds are fixed by laser welding. The ring beam frame 6 and the three support beams are made of HC340 / 590DP or other high-strength steel, and the thickness is between 1-2 mm. The ring beam frame 6 and the support beams are connected and fixed by arc welding to form the box body frame. Threaded holes are provided on the first support beam 7, the second support beam 8, and the third support beam 9 for the installation and fixation of the battery module.

[0029] A separate cavity is isolated in each group of flow channels for filling the PTC heating sheet 16. The PTC heating power in each cavity is the same, and the PTCs are connected in parallel for power supply. Threaded holes are provided at the positions corresponding to each flow channel on the lower cold plate 11. The power lines of the PTC heating sheet 16 pass through the threaded holes and are connected to an external power supply. When the battery temperature is lower than the set threshold, the external power supply supplies power and the PTC starts heating, and the battery can be quickly heated to the required temperature. Compared with liquid coolant heating, the energy consumption is lower and the efficiency is higher.

[0030] By respectively arranging the top heat dissipation structure 2 and the bottom heat dissipation structure 1 at the top and bottom of the battery module, this heat dissipation system reduces the temperature gradient that is likely to occur in the height direction of the battery module. The top heat dissipation structure 2 dissipates heat through the heat dissipation fins 4 at the top of the heat dissipation cover plate 3. The bottom heat dissipation structure 1 dissipates heat by arranging multiple groups of mutually parallel flow channels inside the liquid cooling plate, and throttle blocks 15 are arranged in the flow channels to prevent excessive local flow, thereby regulating the overall flow distribution, ensuring that the flow at the bottom of each group of flow channels is consistent, ensuring that the temperature of each group of flow channels is consistent, reducing the internal temperature difference of each flow channel, and ensuring the uniformity of heat dissipation between different regions of the battery module.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery module heat dissipation system, characterized in that: It includes a top heat dissipation structure and a bottom heat dissipation structure. The top heat dissipation structure includes a heat dissipation cover plate, and a plurality of heat dissipation fins are arranged on the top of the heat dissipation cover plate; the bottom heat dissipation structure includes a liquid cooling plate, and a plurality of groups of mutually parallel flow channels are arranged inside the liquid cooling plate. The water inlet and the water outlet of the liquid cooling plate are connected through the plurality of groups of mutually parallel flow channels, and a throttling block is arranged inside the flow channel.

2. The battery module heat dissipation system according to claim 1, characterized in that: The bottom heat dissipation structure also includes a box frame and a plurality of guard plates, the plurality of guard plates are fixedly installed in sequence along the length direction of the box frame, and the liquid cooling plate is fixedly installed between the box frame and the guard plates.

3. The battery module heat dissipation system according to claim 2, characterized in that: The box frame comprises a ring beam frame, and a first support beam, a second support beam and a third support beam are sequentially arranged on the inner side of the ring beam frame along its length direction, and threaded holes are opened on the first support beam, the second support beam and the third support beam.

4. The battery module heat dissipation system according to claim 3, characterized in that: The edge of the guard plate is provided with a mounting hole, and the ring beam frame is fixedly connected to the guard plate by bolts.

5. The battery module heat dissipation system according to claim 2, characterized in that: Each of the guard plates is provided with stamping ribs.

6. The battery module heat dissipation system according to claim 2, characterized in that: The liquid cooling plate comprises an upper cooling plate and a lower cooling plate which are attached to each other, the flow channel is arranged on the lower cooling plate, and the upper cooling plate is provided with water nozzles which respectively correspond to the water inlet and the water outlet.

7. The battery module heat dissipation system according to claim 6, characterized in that: The upper cold plate is sealed and connected to the bottom end of the box frame.

8. The battery module heat dissipation system according to claim 6, characterized in that: The throttling stopper is circular or waist-shaped, and is a stamping protrusion on the lower cold plate.

9. The battery module heat dissipation system according to claim 6, characterized in that: A PTC heating sheet is arranged in each group of the flow channels, and a threading hole is arranged on the lower cold plate corresponding to each flow channel position, and a power line of the PTC heating sheet passes through the threading hole and is connected to an external power source.

10. The battery module heat dissipation system according to claim 1, characterized in that: An exhaust passage is arranged on the top of the heat dissipation cover plate.

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