Battery pack heat dissipation device

Abstract

The invention discloses a battery pack heat dissipation device, and belongs to the field of battery heat dissipation. Comprising a heat exchange piece with a heat exchange surface and a heat exchange cavity; the liquid injection pipe is communicated with the heat exchange chamber; the liquid injection pipe is also provided with a connecting pipe and a liquid discharge pipe; a plurality of heat dissipation plates are arranged on the connecting pipe, and heat dissipation fans are arranged on the heat dissipation plates; the connecting pipe is further provided with a connecting pump body, and the connecting pump body is used for discharging liquid in the heat exchange cavity from the liquid discharging pipe and enabling the liquid to flow back to the heat exchange cavity from the liquid injection pipe. The battery pack heat exchange device has the beneficial effects that the heat exchange part is in direct contact with the battery pack for heat exchange, so that the heat exchange speed between the heat exchange part and the battery pack is increased, then liquid circulates in the heat exchange cavity, the liquid injection pipe and the liquid outlet pipe, the liquid in the circulation process is cooled, and the heat exchange efficiency is improved. Therefore, the heat exchange piece can be kept at a low temperature for a long time, and the battery pack can be better cooled.

Description

Technical Field

[0001] The present application relates to the field of battery heat dissipation, and in particular, to a battery pack heat dissipation device. Background Art

[0002] The battery pack will be discharged during use, testing or random inspection. The battery pack will generate a lot of heat during discharge. The battery pack needs to be cooled in time to ensure the normal use of the battery pack and avoid dangerous situations.

[0003] Currently, the primary method for cooling battery packs is through air cooling, using a powerful fan to blow air over the battery pack to remove excess heat. However, due to the low specific heat capacity of air, the heat exchange efficiency between air and the battery pack is low, resulting in poor cooling effect. Summary of the Invention

[0004] The content of this application is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify key features or essential features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a battery pack heat dissipation device, including: a heat exchange element, having a heat exchange surface in contact with the battery pack to be cooled and a heat exchange chamber for at least performing heat exchange with the heat exchange surface; an injection pipe, connected to the heat exchange chamber; a connecting pipe and a drain pipe are also provided on the injection pipe; the drain pipe is connected to the heat exchange chamber; the connecting pipe connects the injection pipe and the drain pipe; a plurality of heat dissipation plates are provided on the connecting pipe, and a cooling fan is provided on the heat dissipation plate; the battery packs are provided in multiple groups, and the number of the heat exchange elements, the injection pipes and the drain pipes matches the number of the battery packs; a connecting pump body is also provided on the connecting pipe, and the connecting pump body is used to discharge the liquid in the heat exchange chamber at the drain pipe and return it to the heat exchange chamber at the injection pipe.

[0006] Furthermore, a liquid conducting channel having an inlet and an outlet is provided in the heat exchange chamber; the width of the liquid conducting channel is smaller than the width of the heat exchange chamber; the length of the liquid conducting channel is greater than the circumference of the heat exchange chamber; the liquid injection pipe is connected to the inlet, and the liquid discharge pipe is connected to the outlet.

[0007] Furthermore, multiple injection pipes and multiple drainage pipes are connected to the connecting pipe; a control valve for controlling the drainage speed is set at the position where the drainage pipe and the connecting pipe are connected; a temperature sensor is set on each of the battery packs; the temperature sensor is directly or indirectly connected to the control valve corresponding to the battery pack in signal.

[0008] Furthermore, at least one set of parallel pipelines is provided on the connecting pipe; the parallel pipelines are connected in parallel with the connecting pipe; and parallel pump bodies are provided on the parallel pipelines.

[0009] Furthermore, at least a portion of the connecting pipe is extended in the height direction; the heat dissipation fan and the heat dissipation plate are both matched with the portion of the connecting pipe extending in the height direction;

[0010] The heat dissipation fans are arranged in multiple groups along the height direction.

[0011] Furthermore, the portion of the connecting pipe extending in the height direction is bent multiple times to form a pipeline network; some of the heat dissipation plates are vertically arranged on the pipeline network to form a row of heat dissipation structures; the heat dissipation structures are arranged in multiple rows in the height direction; each row of the heat dissipation structures is provided with a guide member, and the guide member has at least a heat exchange surface filled between multiple heat dissipation plates; the heat dissipation device also includes: a water shower member, which is used to shower water on the uppermost heat dissipation structure so that the water contacts the heat dissipation plate and the heat exchange surface from top to bottom.

[0012] Furthermore, the guide member also has a first baffle surface and a second baffle surface; the first baffle surface and the second baffle surface are both obliquely located between the multiple heat dissipation plates; the first baffle surface is close to the heat dissipation fan, and the second baffle surface is away from the heat dissipation fan; the first baffle surface extends obliquely downward in a direction away from the heat dissipation fan, and the second baffle surface extends obliquely downward in a direction close to the heat dissipation fan; there are multiple first baffle surfaces and multiple second baffle surfaces, and the multiple first baffle surfaces and the second baffle surfaces are distributed in an array along the height direction.

[0013] Furthermore, the water shower component includes: a water storage tank, a guide pipe and a water supply pump body; the water storage tank has an opening, and the water supply pump body adds water in the water storage tank to the heat dissipation plate through the guide pipe.

[0014] Furthermore, a protective cover is provided outside the heat dissipation fan; the water shower element, the heat dissipation fan and the heat dissipation plate are all located in the protective cover.

[0015] Furthermore, the protective cover has a ventilation hole, and a filter is provided at the ventilation hole.

[0016] The beneficial effects of the present application are: heat exchange is carried out by directly contacting the heat exchange component with the battery pack, and all single battery cells in the battery pack are in large-surface contact; thereby, the heat exchange speed between the heat exchange component and the battery pack is much improved compared to the small-surface cooling method at the bottom of each battery cell in the conventional battery pack, and then the liquid is circulated in the heat exchange chamber, the liquid injection pipe, and the liquid outlet pipe, and the liquid in the circulation process is dissipated to dissipate heat, thereby maintaining a low temperature of the heat exchange component for a long time and better cooling the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0018] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0019] In the attached figure:

[0020] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of a part of the embodiment, mainly showing Figure 1 The local structure of

[0022] Figure 3 It is a schematic structural diagram of a part of the embodiment, mainly showing the structure inside the protective cover;

[0023] Figure 4 This is a schematic structural diagram of a part of the embodiment, mainly showing Figure 3 The local structure of

[0024] Figure 5 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the connecting pipe;

[0025] Figure 6 This is a schematic structural diagram of a portion of the embodiment, mainly showing the structure of the heat sink, the pipe network, and the flow guide;

[0026] Figure 7 This is a structural diagram of a part of the embodiment, mainly showing the Figure 6 structure;

[0027] Figure 8 It is a structural diagram of a part of the embodiment, mainly showing the structure of the guide member.

[0028] Reference numerals:

[0029] 1. Heat exchange element; 11. Battery pack; 2. Liquid injection pipe; 21. Connecting pump body; 3. Connecting pipe; 31. Pipe network; 4. Drain pipe; 5. Heat sink; 6. Cooling fan; 7. Water shower element; 71. Water storage tank; 72. Flow guide pipe; 73. Water supply pump body; 8. Flow guide element; 81. Heat exchange surface; 82. First baffle surface; 83. Second baffle surface; 9. Protective cover; 91. Filter. DETAILED DESCRIPTION

[0030] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0031] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0032] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0033] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0034] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] Reference Figure 1-8 ,

[0036] A heat dissipation device for a battery pack 11 includes: a heat exchange element 1, a liquid injection pipe 2, a connecting pipe 3, a liquid discharge pipe 4, a heat dissipation plate 5 and a heat dissipation fan 6.

[0037] The heat exchange component 1 has a heat exchange surface in contact with the battery pack 11 to be cooled and a heat exchange chamber that at least performs heat exchange with the heat exchange surface. The injection pipe 2 is connected to the heat exchange chamber; the discharge pipe 4 is connected to the heat exchange chamber; and the connecting pipe 3 connects the injection pipe 2 and the discharge pipe 4. A connecting pump body 21 is also provided on the connecting pipe 3. The connecting pump body 21 is used to discharge the liquid in the heat exchange chamber through the discharge pipe 4 and return it to the heat exchange chamber through the injection pipe 2. The liquid in the heat exchange chamber is filled with coolant, so the coolant can circulate between the heat exchange chamber, the discharge pipe 4, the connecting pipe 3 and the injection pipe 2. A plurality of heat sinks 5 are provided on the connecting pipe 3, and a heat dissipation fan 6 is provided on the heat dissipation plate 5. The coolant discharged outward from the heat exchange chamber has a higher temperature, and then reaches the connecting pipe 3, exchanges heat with the heat sink 5, and then the heat dissipation fan 6 blows away the heat on the heat sink 5, thereby achieving the effect of cooling the coolant in the connecting pipe 3. The coolant is cooled during the circulation process, keeping the coolant temperature in the heat exchange chamber low, and better cooling the battery pack 11.

[0038] Multiple battery packs 11 are provided, and the number of heat exchange elements 1, injection pipes 2, and drainage pipes 4 matches the number of battery packs 11. The heat exchange surface 81 of each heat exchange element 1 contacts one battery pack 11, thereby enabling simultaneous cooling of multiple battery packs 11. A base is provided at the bottom of each battery pack 11, on which the battery pack 11 is placed. The base has a gap at the bottom, which elevates the battery pack 11 and creates a distance between the battery pack 11 and the ground. This ensures good air circulation beneath the battery pack 11, preventing heat accumulation beneath the battery pack 11.

[0039] Specifically, a liquid-conducting cavity with an inlet and an outlet is provided in the heat exchange chamber; the width of the liquid-conducting cavity is smaller than the width of the heat exchange chamber; the length of the liquid-conducting cavity is greater than the circumference of the heat exchange chamber; the liquid injection pipe 2 is connected to the inlet, and the liquid discharge pipe 4 is connected to the outlet. To be precise, the liquid-conducting cavity forms a cavity network after multiple bends, so that when the coolant flows in the liquid-conducting cavity, it can more fully exchange heat with the battery pack 11, thereby cooling the battery pack 11. At least one set of parallel pipelines is provided on the connecting pipe 3; the parallel pipelines are connected in parallel with the connecting pipe 3; and parallel pump bodies are provided on the parallel pipelines. The parallel pump bodies on the parallel pipelines are used to increase the circulation speed of the coolant in the heat exchange chamber, and can also serve as a backup pump body, relying on the parallel pump body for normal operation when the connecting pump body 21 needs maintenance.

[0040] Specifically, the plurality of injection pipes 2 and the plurality of discharge pipes 4 are connected to the connecting pipe 3; a control valve for controlling the discharge rate is provided at the connection point between the discharge pipe 4 and the connecting pipe 3; a temperature sensor is provided on each battery pack 11; and the temperature sensor is directly or indirectly connected to the control valve corresponding to the battery pack 11. The maximum power of the connected pump 21 is a fixed value. By configuring the plurality of control valves, several of the control valves can be closed, so that only a portion of the coolant in the heat exchange chamber is in a circulating state. This allows the coolant in this portion to circulate faster, resulting in a lower coolant temperature in the heat exchange chamber and better heat dissipation for the battery pack 11. Alternatively, reducing the opening of several of the control valves can also provide better heat dissipation for some of the battery packs 11. However, reducing the opening of the control valves slows the coolant circulation rate in the corresponding discharge pipe 4 and heat exchange element, thereby slowing the cooling effect on the battery pack 11. The present application utilizes the setting of a temperature sensor to monitor the temperature of multiple battery packs 11 in real time. If the temperature of one or several battery packs 11 increases, the opening of the control valves corresponding to these battery packs 11 is increased to the maximum, and then the opening of the control valves corresponding to the battery packs 11 with relatively low temperatures among the battery packs 11 monitored in real time by the temperature sensor is reduced, so as to quickly cool down the battery packs 11 with higher temperatures, better ensure the uniform temperature of the multiple battery packs 11, and have better power supply performance and better safety.

[0041] Specifically, the connecting pipe 3 is at least partially extended in the height direction; the cooling fan 6 and the heat sink 5 are both engaged with the portion of the connecting pipe 3 extending in the height direction; and multiple groups of cooling fans 6 are provided in the height direction. Thus, the multiple cooling fans 6 enhance the cooling effect of the coolant.

[0042] In some other embodiments, the portion of the connecting pipe 3 extending in the height direction is bent multiple times to form a pipe network 31; some of the heat sinks 5 are vertically arranged on the pipe network 31 to form a row of heat dissipation structures; the heat dissipation structures are arranged in multiple rows along the height direction; each row of heat dissipation structures is provided with a flow guide 8, each flow guide 8 having at least a heat exchange surface 81 that fills the spaces between the heat sinks 5; and the heat dissipation device further includes a water shower 7 for showering water onto the topmost heat dissipation structure so that the water contacts the heat sinks 5 and the heat exchange surface 81 from top to bottom. After showering the water onto the heat sinks 5, the water flows downward along the gaps between the heat sinks 5. Therefore, the heat exchange surface 81 formed by the flow guide 8 can contact the water, slowing the water's downward flow and ensuring better contact with the heat sinks 5, thereby improving the cooling effect of the heat sinks 5 on the coolant. The copper wire and the cooling fan 6 blow air onto the heat sinks 5, causing the water on the heat sinks 5 to evaporate, thereby absorbing heat through evaporation.

[0043] Specifically, the guide member 8 further comprises a first baffle 82 and a second baffle 83. The guide member 8 is a frame that is inserted into the plurality of heat sinks 5. The guide member 8 comprises a plurality of first baffles 82, a plurality of second baffles 83, and a plurality of heat exchange surfaces 81. Both the first baffle 82 and the second baffle 83 are located obliquely between the plurality of heat sinks 5. The first baffle 82 is close to the heat sink fan 6, while the second baffle 83 is away from the heat sink fan 6. The first baffle 82 extends downwardly and obliquely away from the heat sink fan 6, while the second baffle 83 extends downwardly and obliquely toward the heat sink fan 6. There are multiple first baffles 82 and second baffles 83, each of which is arranged in an array along the height direction. The first baffle 82 prevents water flowing downward on the heat exchange surface 81 from flowing toward the heat sink fan 6, while the first baffle 82 blocks some of the downstream water, preventing it from entering the heat sink fan 6. The second blocking surface 83 can prevent water from splashing outward from the heat sink 5 away from the heat sink fan 6, thereby allowing the water to flow downward between the heat sinks 5 better, thereby better improving the heat dissipation effect of the coolant.

[0044] Specifically, the water shower 7 includes a water tank 71, a flow guide 72, and a water supply pump 73. The water tank 71 has an opening, and the water supply pump 73 delivers water from the water tank 71 to the heat sink 5 through the flow guide 72. A protective cover 9 is provided outside the heat sink fan 6; the water shower 7, the heat sink fan 6, and the heat sink 5 are all located within the protective cover 9.

[0045] Specifically, the protective cover 9 has a vent, and a filter 91 is provided at the vent. The filter 91 prevents dust from entering the cooling fan 6 and protects the cooling fan 6.

[0046] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A battery pack heat dissipation device, characterized in that: include: a heat exchange element having a heat exchange surface in contact with the battery pack to be cooled and a heat exchange chamber for at least exchanging heat with the heat exchange surface; An injection pipe is connected to the heat exchange chamber; a connecting pipe and a drain pipe are also provided on the injection pipe; the drain pipe is connected to the heat exchange chamber; the connecting pipe connects the injection pipe and the drain pipe; A plurality of heat dissipation plates are provided on the connecting pipe, and a heat dissipation fan is provided on the heat dissipation plates; The battery packs are provided in multiple groups, and the number of the heat exchange elements, the injection pipes and the discharge pipes matches the number of the battery packs; A connecting pump body is also provided on the connecting pipe, and the connecting pump body is used to discharge the liquid in the heat exchange chamber through the discharge pipe and return the liquid to the heat exchange chamber through the injection pipe.

2. The battery pack heat dissipation device according to claim 1, characterized in that: A liquid conducting channel having an inlet and an outlet is provided in the heat exchange chamber; the width of the liquid conducting channel is smaller than the width of the heat exchange chamber; the length of the liquid conducting channel is greater than the circumference of the heat exchange chamber; The liquid injection pipe is communicated with the inlet, and the liquid discharge pipe is communicated with the outlet.

3. The battery pack heat dissipation device according to claim 2, characterized in that: The plurality of liquid injection pipes and the plurality of liquid discharge pipes are all connected to the connecting pipe; A control valve for controlling the discharge speed is provided at the connection position between the discharge pipe and the connecting pipe; A temperature sensor is provided on each battery pack; the temperature sensor is directly or indirectly connected to the control valve corresponding to the battery pack.

4. The battery pack heat dissipation device according to claim 2, wherein: At least one set of parallel pipelines is arranged on the connecting pipe; the parallel pipelines are connected in parallel with the connecting pipe; and parallel pump bodies are arranged on the parallel pipelines.

5. The battery pack heat dissipation device according to claim 1 or 2, characterized in that: At least a portion of the connecting pipe is extended in the height direction; the cooling fan and the cooling plate are both matched with the portion of the connecting pipe extending in the height direction; The heat dissipation fans are arranged in multiple groups along the height direction.

6. The battery pack heat dissipation device according to claim 5, characterized in that: The portion of the connecting pipe extending in the height direction is bent multiple times to form a pipe network; some of the heat dissipation plates are vertically arranged on the pipe network to form a row of heat dissipation structures; the heat dissipation structures are arranged in multiple rows in the height direction; A flow guide is provided on each row of the heat dissipation structures, and the flow guide has at least a heat exchange surface filled between a plurality of heat dissipation plates; The heat dissipation device further comprises a water shower component, which is used to shower water on the uppermost heat dissipation structure so that the water contacts the heat dissipation plate and the heat exchange surface from top to bottom.

7. The battery pack heat dissipation device according to claim 6, characterized in that: The guide member further comprises a first blocking surface and a second blocking surface; the first blocking surface and the second blocking surface are both obliquely located between the plurality of heat dissipation plates; The first blocking surface is close to the cooling fan, and the second blocking surface is far away from the cooling fan; The first blocking surface extends obliquely downward in a direction away from the cooling fan, and the second blocking surface extends obliquely downward in a direction close to the cooling fan; There are multiple first blocking surfaces and multiple second blocking surfaces, and the multiple first blocking surfaces and the multiple second blocking surfaces are distributed in an array along the height direction.

8. The battery pack heat dissipation device according to claim 7, characterized in that: The water shower component includes: a water storage tank, a guide pipe and a water supply pump body; the water storage tank has an opening, and the water supply pump body adds water in the water storage tank to the heat dissipation plate through the guide pipe.

9. The battery pack heat dissipation device according to claim 8, characterized in that: A protective cover is arranged outside the heat dissipation fan; the water shower element, the heat dissipation fan and the heat dissipation plate are all located in the protective cover.

10. The battery pack heat dissipation device according to claim 9, characterized in that: The protective cover is provided with a vent, and a filter is arranged at the vent.

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