CN207602734U - A kind of power battery thermal management system - Google Patents

Abstract

The utility model relates to a power battery heat management system, which belongs to the technical field of power batteries. The power battery thermal management system includes: a battery box, a temperature adjustment device, a controller, a power switch and a plurality of semiconductor cooling chips. The temperature adjustment device is connected to the battery box, and a plurality of semiconductor refrigeration chips are arranged on the temperature adjustment device, and connected to the power terminal of the battery box through a power switch, and the controller is connected to the power switch, which is used to control the power switch so that multiple semiconductor refrigeration chips slice refrigeration. A plurality of phase change components and a plurality of battery components are arranged in the battery box, and a temperature sensor connected to the controller is arranged in each phase change component. The temperature adjustment device includes: a hollow plate and a plurality of heat pipes, the hollow plate is filled with cooling liquid in a vacuum state, one end of each heat pipe is connected with the hollow plate, and the other end is closed and embedded in the battery box. The utility model has the advantages of simple structure, high heat dissipation efficiency, easy control, light weight, low cost, excellent performance and the like.

Description

A power battery thermal management system

technical field

The utility model belongs to the technical field of power batteries, and in particular relates to a power battery thermal management system.

Background technique

The power battery is one of the core components of an electric vehicle, which provides power for the entire vehicle. The power battery of an electric vehicle is generally composed of a single module. When the battery pack is composed of modules, its service life, work efficiency and safety are directly related. Or indirectly affected by temperature, therefore, to improve its performance and safety, its working temperature must be controlled within a reasonable range. Due to the internal chemical reaction, a large amount of heat will be released, such as electrochemical reaction heat generation, internal polarization reaction heat generation and Joule heat, etc. If the heat cannot be dissipated in time, the electrolyte will catch fire and cause a fire or even an explosion. , endangering the safety of use. At present, most power batteries use an air-cooled structure or a liquid-cooled structure to dissipate heat. Among them, air cooling has simple structure, low cost and wide application. However, its heat exchange efficiency is low, the heat dissipation is uneven, and the air duct is prone to be blocked by dust. The liquid cooling structure has high heat exchange efficiency, which can meet the heat dissipation requirements of the battery during high-rate charge and discharge, and give full play to the best performance of the battery. However, the current research on the liquid cooling structure of power batteries is not mature, and the heat transfer efficiency of the cooling structure is not high. At present, the air cooling structure or liquid cooling structure used has problems such as complex system, low heat dissipation efficiency, and uneven temperature inside the module, which directly affects the performance and service life of the battery, as well as the safety and reliability of the system.

Utility model content

In view of this, the purpose of the present utility model is to provide a power battery thermal management system to effectively improve the above problems.

Embodiments of the utility model are achieved in that:

The embodiment of the utility model provides a power battery thermal management system, including: a battery box, a temperature adjustment device, a controller, a power switch and a plurality of semiconductor cooling chips. The temperature regulating device is connected to the battery box, the plurality of semiconductor refrigeration chips are arranged on the temperature regulating device, and are connected to the power terminal of the battery box through the power switch, and the controller is connected to the battery box. The power switch is connected, and is used to control the power switch to make the plurality of peltier coolers refrigerate. A plurality of phase change components and a plurality of battery components are arranged in the battery box, and the plurality of battery components and the plurality of phase change components are arranged alternately, wherein each of the phase change components is provided with a temperature sensor , each of the temperature sensors is connected to the controller. The temperature regulating device includes: a hollow plate and a plurality of heat pipes. The hollow plate fills two-thirds of its volume with cooling liquid in a vacuum state. One end of each heat pipe communicates with the hollow plate, and the other end It is closed and embedded in the battery box, so that the cooling liquid flows from one end of each heat pipe to the other end of the heat pipe, and then conducts heat inside the battery box.

In a preferred embodiment of the present invention, the hollow plate includes: a first side and a second side, the first side and the second side are opposite faces, and the first side is provided with multiple a plurality of semiconductor cooling chips, and a plurality of semiconductor cooling chips are arranged at intervals on the second side.

In a preferred embodiment of the present invention, the plurality of semiconductor cooling fins disposed on the first side and the plurality of semiconductor cooling fins disposed on the second side are interlaced.

In a preferred embodiment of the present invention, the thermal management system of the power battery further includes: heat sinks having the same number as the plurality of semiconductor cooling chips, each of the cooling devices corresponds to one of the semiconductor cooling chips, and To dissipate heat for the semiconductor cooler.

In a preferred embodiment of the present invention, each of the heat dissipation devices includes: a heat dissipation block and a heat dissipation fan, the heat dissipation fan is arranged on the heat dissipation block, and the other side of the heat dissipation block is connected to the semiconductor Refrigerator connection.

In a preferred embodiment of the present invention, the temperature regulating device further includes: a plurality of cooling fins arranged on the hollow plate, a plurality of cooling fins arranged on the first side and The plurality of semiconductor cooling fins arranged on the first side are interlaced with each other, and the plurality of heat dissipation fins arranged on the second side are connected with the plurality of semiconductor cooling fins arranged on the second side. intertwined.

In a preferred embodiment of the present invention, each of the heat dissipation fins is a staggered grid-shaped heat dissipation fin composed of a plurality of hollow heat dissipation fins.

In a preferred embodiment of the present invention, there are N battery components, and N+1 phase change components, and N battery components and N+1 phase change components are arranged alternately, And both ends are the phase change components.

In a preferred embodiment of the present invention, the thermal management system of the power battery further includes: an insulation layer, and the insulation layer is arranged on the inner wall of the battery box.

In a preferred embodiment of the present invention, the power battery thermal management system further includes: a fireproof layer, and the fireproof layer is arranged on the heat preservation layer away from the inner wall of the battery box.

The thermal management system of the power battery provided by the embodiment of the utility model can effectively export the heat inside the battery box through the coupling mode of the adjustment device and the semiconductor cooling plate and the double heat conduction effect of the phase change component. The outside of the battery box is coupled with the semiconductor cooling sheet through a temperature adjustment device. When the temperature inside the system is within the temperature range that the phase change component can store, the semiconductor cooling sheet does not work. The system relies on the heat pipe combined with the heat conduction and cooling functions of the hollow plate and the phase The temperature of the system is adjusted by changing the energy storage performance of the material itself. When the internal temperature of the battery pack is higher than the phase change temperature of the phase change component, start the power switch to cool the semiconductor refrigeration sheet, and the semiconductor refrigeration sheet cools the hollow plate of the temperature adjustment device. By using the heat pipe as a heat bridge, it can further cool the battery pack. The temperature is effectively controlled, and the efficiency of the semiconductor refrigeration sheet is high, which can actively control the internal temperature of the battery pack in time and on demand. The utility model has the advantages of simple structure, high heat dissipation efficiency, good temperature balance between single cells, easy control, convenient processing and manufacturing, light weight, low cost, excellent performance, and can improve the energy density, performance and service life of the battery assembly as a whole and system security and reliability.

Other features and advantages of the present invention will be set forth in the following description, and partly become apparent from the description, or can be understood by implementing the embodiments of the present invention. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts. The above and other purposes, features and advantages of the present utility model will be more clearly shown by the accompanying drawings. Like reference numerals designate like parts throughout the drawings. The accompanying drawings are not intentionally scaled and drawn according to the actual size, and the emphasis is on showing the gist of the present utility model.

Fig. 1 shows a structural schematic view of a power battery thermal management system provided by an embodiment of the present invention from a first perspective.

Fig. 2 shows the AA sectional view in Fig. 1 provided by the embodiment of the present invention.

Fig. 3 shows the sectional view of BB in Fig. 1 provided by the embodiment of the present invention.

Fig. 4 shows a schematic structural view of a power battery thermal management system provided by an embodiment of the present invention from a second perspective.

Fig. 5 shows a schematic diagram of modules of a power battery thermal management system provided by an embodiment of the present invention.

Icons: 10-power battery thermal management system; 11-battery box; 111-box body; 112-insulation layer; 113-fire protection layer; 114-phase change component; 115-battery component; 1211-first side; 1212-second side; 122-heat pipe; 123-radiating fin; 13-controller; 14-power switch; 162 - Cooling fan.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "inner" and "outer" are based on The orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the utility model product is used, is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the device or element referred to Must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless otherwise specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection , can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The embodiment of the present utility model provides a thermal management system 10 for a power battery, please refer to FIG. 1 , FIG. 3 and FIG. 5 . The power battery thermal management system 10 includes: a battery box 11 , a temperature regulating device 12 , a controller 13 , a power switch 14 , a semiconductor cooling chip 15 and a heat sink 16 .

As shown in FIG. 2 , the battery box 11 includes: a box body 111 and a plurality of battery components 115 and a plurality of phase change components 114 disposed in the box body 111 . The box body 111 can be made of various materials. In this embodiment, preferably, the box body 111 is made of carbon fiber material. Because carbon fiber has "soft outside and rigid inside", its quality is lighter than that of metal aluminum, but its strength is high. It is better than steel, and has the characteristics of corrosion resistance and high modulus, so as to achieve the effect of protecting the battery, for example, it can effectively prevent the battery assembly 115 from being impacted by the outside and being submerged in water.

In order to ensure that the working environment of the battery tends to be stable, as an embodiment, preferably, the power battery thermal management system 10 further includes: an insulation layer 112 disposed on the inner wall of the box body 111 . The insulation layer 112 can be made of various materials. In this embodiment, preferably, the insulation layer 112 is made of rigid polyurethane foam. Since rigid polyurethane foam is mostly a closed-cell structure, it has excellent properties such as good heat insulation effect, light weight, high specific strength, and convenient construction. It also has the characteristics of sound insulation, shockproof, electrical insulation, heat resistance, cold resistance, and solvent resistance. In turn, it can ensure that the working environment of the battery tends to be stable.

In order to prevent the battery from colliding, igniting and explosion during use, as an embodiment, preferably, the thermal management system 10 of the power battery further includes: Fire protection layer 113. The fireproof layer 113 can be made of various materials, for example, it can be polyvinyl chloride, epoxy resin and the like.

Wherein, the plurality of battery assemblies 115 and the plurality of phase change assemblies 114 are interleavedly arranged in the box body 111, further, the number of the phase change assemblies 114 is N, and the number of the phase change assemblies 114 is N +1, N battery components 115 and N+1 phase change components 114 are arranged alternately, and both ends are the phase change components 114 . For a better understanding, take 3 battery components 115 and 4 phase change components 114 as examples for illustration, that is, according to phase change components 114, battery components 115, phase change components 114, battery components 115, phase change components 114, battery The arrangement of the component 115 and the phase change component 114 is set. Wherein, N is a positive integer, and the specific number depends on actual design requirements, and is not limited here.

Wherein, each battery assembly 115 is composed of a plurality of single cells connected in series, for example, the single cells may be 18650 type power lithium batteries.

Wherein, each phase change component 114 is made of phase change materials (PhaseChangeMaterials, PCM) and embedded with a temperature sensor (not shown in the figure). Furthermore, as an embodiment, it is made by compounding paraffin wax with a phase transition temperature of 45° C., expanded graphite and thermally conductive silica gel. For example, melt paraffin, add expanded graphite with a mass ratio of 20%, and fully stir to make the expanded graphite fully absorb paraffin, then add thermally conductive silica gel with a mass ratio of 5% and fully stir to obtain a paraffin graphite thermally conductive silica gel composite phase change Material, through the designed specific mold, under the environment of 25 degrees Celsius, extrude the paraffin graphite thermal silica gel composite phase change material to make it more substantial, and insert a temperature sensor at the appropriate position to detect the temperature of the phase change material , and finally make it sufficiently cooled and shaped to obtain the phase change component 114 . Among them, in order to improve the plasticity of the phase change component 114, in the process of making the component, the honeycomb aluminum core can also be soaked in the graphite paraffin thermal conductive silica gel composite phase change material, so that it can fully absorb the paraffin solution, and then through a specific Die extrusion to obtain the phase change component 114, making it easy to shape, stronger and less prone to damage. The honeycomb aluminum core is used as the skeleton of the phase change material, which can effectively improve the mechanical properties of the composite phase change material and improve the overall thermal conductivity of the composite phase change material It can effectively shorten the phase change time of the overall phase change material. At the same time, the mixture of expanded graphite and paraffin improves the thermal conductivity of the phase change material in the inner hole of the honeycomb aluminum core, ensuring that the phase change material can be melted at the same time or almost at the same time. , which is of great significance to improving the temperature uniformity of the overall phase change material. Through this method, the temperature uniformity among the individual cells in the battery assembly 115 can be effectively improved.

Wherein, the phase change component 114 can store the heat dissipated by the battery component 115 during use in the form of phase change, and release the heat through the phase change when the battery needs to be heated.

Wherein, in this embodiment, the temperature sensor may be a common temperature measuring component currently on the market. Examples include thermocouples, thermistors, resistance temperature detectors (RTDs), and IC temperature sensors. For example, choose the DS18B20 temperature sensor, because the DS18B20 temperature sensor can be purchased in the market, and the DS18B20 temperature sensor can be purchased and used by people, the specific usage method must be well known to the public, for example, how to set each pin function, how to set up the connection of each pin with other devices, etc.

There are multiple semiconductor cooling chips 15 , which are arranged on the temperature regulating device 12 for cooling the battery box 11 . Wherein, the semiconductor cooling chip 15 is also called a thermoelectric cooling chip, which is a kind of heat pump and a tool for heat transfer. Utilizing the Peltier effect of semiconductor materials, when direct current passes through a galvanic couple made of two different semiconductor materials in series, heat can be absorbed and released at both ends of the galvanic couple. Further, when an N-type semiconductor material and a P-type semiconductor When a current passes through the thermocouple pair formed by material connection, heat transfer will occur between the two ends, and the heat will be transferred from one end to the other end, thereby generating a temperature difference to form a hot and cold end, which can be controlled by controlling the direction of the thermocouple current. Control the heating or cooling of the semiconductor cooling sheet 15 to ensure that the temperature environment inside the battery box 11 tends to be stable. Wherein, each semiconductor cooling chip 15 is connected to the power terminal of the battery box 11 through a power switch 14 .

Wherein, as an embodiment, the power switch 14 is a relay, that is, the positive and negative terminals of each semiconductor cooling chip 15 are connected to the normally open contact of the relay, further, the positive terminal of the semiconductor cooling chip 15 is connected to the The positive end of the open contact is connected, the negative end of the semiconductive cooling sheet 15 is connected with the negative end of the normally open contact, the control terminal (coil) of the power switch 14 is connected with the controller 13, and the common contact of the power switch 14 It is connected with the power supply end of the battery box 11, and the normally closed contact of the relay is grounded. When the relay is in the first state, that is, when the normally closed contact is in communication with the common contact, if the end of the semiconductor refrigeration sheet 15 in contact with the temperature regulating device 12 is the cold end, the end far away from the temperature regulating device 12 is the hot end , at this time, the battery box 11 can be refrigerated; when the relay is in the second state, that is, when the normally open contact is connected to the common terminal, the semiconductor cooling plate 15 stops cooling at this time.

Wherein, the refrigerating process of the peltier refrigerating sheet 15 is described with the schematic diagram shown in FIG. 5 .

The controller 13 controls the power switch 14 to be in the first state or the second state through the temperature detected by the temperature sensor to ensure that the temperature environment inside the battery box 11 tends to be stable. Further, when the temperature is lower than the first threshold, the controller 13 controls the power switch 14 to be in the second state, and the semiconductor refrigeration sheet 15 stops cooling, and when the temperature is higher than the second threshold, controls the power switch 14 to be in the first state. state, cooling the battery box 11. For ease of understanding, in this embodiment, an example will be used for description. Assume that under normal circumstances, the temperature inside the battery box 11 is between 30 degrees Celsius and 45 degrees Celsius. When the temperature is higher than 45 degrees Celsius, the power switch 14 is controlled to be in the first state, so that the semiconductor refrigeration sheet 15 is refrigerated to achieve For the purpose of cooling the battery box 11, when the temperature is lower than 35 degrees Celsius, the power switch 14 is controlled to be in the second state, and the semiconductor refrigeration sheet 15 stops cooling.

Wherein, the temperature listed above is only to illustrate the process that the controller 13 controls the power switch 14 according to the temperature detected by the temperature sensor, and its specific temperature value cannot be understood as a limitation to the present invention, and its specific temperature depends on the actual temperature. Need, the first threshold and the second threshold in the above are also set according to actual needs, but can not be understood as a limitation of the present invention, as in the above example, the first threshold can be 35 degrees Celsius, The second threshold value of 45 degrees Celsius can be understood as a limitation of the present invention.

Wherein, the above-mentioned controller 13 may be a chip with signal processing capability, for example, it may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (NetworkProcessor, NP), etc.; It is a digital signal processor (Digital Signal Processing, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices , Discrete hardware components. Wherein, the general-purpose processor may be a microprocessor or any conventional processor or the like. In this embodiment, preferably, the controller 13 may be a TMS320LF2812 type microprocessor, and this type of microprocessor can be purchased and used by people, and its specific usage must be well known to the public, for example , specifically how to set the function of each pin, how to set the connection between each pin and other devices, etc.

The temperature adjustment device 12 is used to adjust the temperature of the battery box 11 to stabilize its working temperature range, so as to ensure the performance and service life of the system as much as possible. In this embodiment, preferably, the temperature regulating device 12 includes: a hollow plate 121 , a plurality of heat pipes 122 and a plurality of cooling fins 123 .

The shape of the hollow plate 121 can be various. In this embodiment, preferably, the shape of the hollow plate 121 is a cuboid, and its interior is a hollow structure, which is filled with cooling liquid in a vacuum state. In this embodiment, as shown in FIG. 4 , the hollow plate 121 includes: a first side 1211 and a second side 1212 , wherein the first side 1211 and the second side 1212 are opposite surfaces.

A plurality of semiconductor cooling fins 15 and a plurality of cooling fins 123 are arranged at intervals on the first side 1211. Preferably, a plurality of semiconductor cooling fins 15 and a plurality of cooling fins 123 are arranged alternately. For ease of understanding, the first side 1211 may be divided into odd-numbered areas marked 1, 3, 5... and even-numbered areas marked 2, 4, 6... . Wherein, if the cooling fins 123 are arranged in the even-numbered regions, the peltier cooling fins 15 are arranged in the odd-numbered regions, and if the cooling fins 123 are arranged in the odd-numbered regions, then the peltier cooling fins 15 are arranged in the even-numbered regions.

A plurality of semiconductor cooling fins 15 and a plurality of cooling fins 123 are arranged at intervals on the second side 1212, preferably, a plurality of semiconductor cooling fins 15 and a plurality of cooling fins 123 are arranged alternately. For ease of understanding, the second side surface 1212 may be divided into odd-numbered areas marked 1, 3, 5... and even-numbered areas marked 2, 4, 6... . Wherein, if the cooling fins 123 are arranged in the even-numbered regions, the peltier cooling fins 15 are arranged in the odd-numbered regions, and if the cooling fins 123 are arranged in the odd-numbered regions, then the peltier cooling fins 15 are arranged in the even-numbered regions.

Wherein, as an implementation manner, the plurality of peltiers 15 arranged on the first side 1211 and the plurality of peltiers 15 arranged on the second side 1212 are interlaced. That is, the division of even-numbered areas and odd-numbered areas on the first side 1211 is the same as the division of even-numbered areas and odd-numbered areas on the second side 1212, that is, the number and size are the same, for example, all are 3 odd-numbered areas and three-numbered areas .

Wherein, except that the first side 1211 (left side) and the second side 1212 (right side) of the hollow plate 121 are provided with a plurality of cooling fins 123, the cooling fins 123 can also be arranged in the rest of the area, For example, the cooling fins 123 are provided on the front and rear sides of the hollow plate 121 . The structure of the heat dissipation fins 123 can be various. In this embodiment, preferably, each heat dissipation fin 123 is a staggered grid-shaped heat dissipation fin composed of a plurality of hollowed heat dissipation fins, so as to cool The liquid condenses and flows back to enhance the heat conduction and heat dissipation capabilities of the heat pipe 122 .

One end of each heat pipe 122 is open and the other end is closed. In this embodiment, one end of each heat pipe 122 is connected to the hollow plate 121, and the other end is embedded in the battery box 11, and further, is embedded in the battery box. 11. For the internal phase change material, when making it, first fix the heat pipe 122, and then pour the paraffin graphite heat-conducting silica gel composite phase change material into the mold, so that the heat pipe 122 is fixed in the phase change material. The heat pipe 122 can be made of various materials, for example, it can be a copper pipe with excellent thermal conductivity. Among them, preferably, the number of heat pipes 122 embedded in each phase change component 114 is 2, that is, one heat pipe 122 is embedded on both sides of the phase change material (at the pole position where the battery component 115 generates more heat).

Wherein, when the temperature in the battery box 11 is higher than the second threshold, the power switch 14 is activated to make it in the first state, so that the semiconductor cooling sheet 15 is refrigerated, and the purpose of cooling the battery box 11 is achieved. Further, at this time , the semiconductor cooling sheet 15 cools the hollow plate 121, so that the temperature of the coolant filled in the hollow plate 121 is lowered to take away the heat inside the battery box 11, and the heat can be transferred through the heat pipe 122 itself, or through The coolant is transferred so that its heat flows from the other end of the heat pipe 122 (embedded in the phase change assembly 114 of the battery box 11) to one end of the heat pipe 122 (the end communicating with the hollow plate 121), and then the heat inside the battery box 11 export.

Wherein, one end of the heat pipe 122 may be disposed on the hollow plate 121 and communicated with the hollow plate 121 , or disposed on the cooling fin 123 and communicated with the hollow plate 121 . Using the heat pipe 122 as a heat bridge, the excess heat can be accurately and timely effectively extracted from the inside of the battery box 11 , especially in the case of thermal runaway of the battery pack, the semiconductor cooling sheet 15 can effectively dissipate heat from the battery pack.

Wherein, in order to speed up the cooling effect of the system, the power battery thermal management system 10 further includes: a heat sink 16 for dissipating heat from the semiconductor cooling sheet 15 . In this embodiment, preferably, the number of the heat sinks 16 is the same as the number of the peltiers 15 . One of the heat sinks 16 corresponds to one semiconductor cooling chip 15 . In this embodiment, as shown in FIG. 1 , the heat dissipation device 16 includes: a heat dissipation block 161 and a heat dissipation fan 162 . The heat dissipation fan 162 is disposed on the heat dissipation block 161 , and the other side of the heat dissipation block 161 is connected to the semiconductor cooling fin 15 . Further, the heat dissipation block 161 is connected to the heating surface of the peltier 15, and the connection method may be by bonding, for example, by thermally conductive silica gel. When the temperature inside the battery box 11 is higher than the second threshold, start the power switch 14 to make it in the first state, so that the semiconductor cooling sheet 15 is refrigerated, and reaches the purpose of cooling the battery box 11. At this time, the semiconductor cooling sheet 15 and The side in contact with the temperature regulating device 12 is the cold end, and the side in contact with the cooling block 161 is the hot end. At this time, the cooling fan 162 is started to dissipate the heat from the hot end, and the temperature of the cold end will also decrease accordingly, thereby reaching a lower temperature. The temperature can speed up the cooling effect.

In summary, the power battery thermal management system provided by the example of the utility model uses the triple heat conduction function of the honeycomb aluminum core, the phase change component made of the composite phase change material, and the heat sink through the coupling of the adjustment device and the semiconductor refrigeration sheet , can effectively dissipate the heat inside the battery box. The outside of the battery box is coupled with the semiconductor refrigeration plate through a temperature adjustment device. Since 30°C to 45°C is the effective and optimal operating temperature of the power battery, the phase change temperature of the phase change component is 45°C. When the temperature inside the system is within the phase change component When the storage temperature is within the temperature range, that is, when the internal temperature of the system does not exceed 45°C, the semiconductor cooling chip does not work, and the system adjusts the system temperature by combining the heat pipe with the heat conduction and heat dissipation function of the hollow plate and the energy storage performance of the phase change material itself. When the internal temperature of the battery pack is 45°C higher than the phase change temperature of the phase change component, the power switch is turned on to cool the semiconductor cooling sheet, and the semiconductor cooling sheet cools the hollow plate of the temperature adjustment device, and the heat pipe is used as a heat bridge to cool the battery. The temperature in the battery pack is effectively controlled, and the efficiency of the semiconductor cooling chip is high, which can actively control the internal temperature of the battery pack in time and on demand. The utility model has the advantages of simple structure, high heat dissipation efficiency, good temperature balance between single cells, easy control, convenient processing and manufacturing, light weight, low cost, excellent performance, and can improve the energy density, performance and service life of the battery assembly as a whole and system security and reliability.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. A power battery thermal management system, characterized in that it includes: a battery box, a temperature adjustment device, a controller, a power switch, and a plurality of semiconductor refrigeration chips, the temperature adjustment device is connected to the battery box, and the plurality of A semiconductor cooling chip is arranged on the temperature regulating device, and is connected with the power terminal of the battery box through the power switch, and the controller is connected with the power switch, and is used to control the power switch so that the A plurality of semiconductor refrigeration chips are refrigerated; A plurality of phase change components and a plurality of battery components are arranged in the battery box, and the plurality of battery components and the plurality of phase change components are arranged alternately, wherein each of the phase change components is provided with a temperature sensor , each of the temperature sensors is connected to the controller; The temperature adjustment device includes: a hollow plate and a plurality of heat pipes, the hollow plate is filled with cooling liquid to two-thirds of its volume in a vacuum state, one end of each heat pipe is connected with the hollow plate, and the other One end is closed and embedded in the battery box, so that the cooling liquid flows from one end of each heat pipe to the other end of the heat pipe, thereby dissipating the heat inside the battery box. 2. The power battery thermal management system according to claim 1, wherein the hollow plate comprises: a first side and a second side, the first side and the second side are opposite sides, the A plurality of semiconductor cooling chips are arranged at intervals on the first side, and a plurality of semiconductor cooling chips are arranged at intervals on the second side. 3. The power battery thermal management system according to claim 2, characterized in that, the plurality of semiconductor cooling fins arranged on the first side and the plurality of semiconductor cooling fins arranged on the second side The cooling sheets are interlaced with each other. 4. The power battery thermal management system according to any one of claims 1-3, characterized in that, the power battery thermal management system further comprises: heat dissipation devices having the same number as the plurality of semiconductor cooling fins, each The heat dissipation device corresponds to one of the semiconductor cooling fins, and is used to dissipate heat for the semiconductor cooling fins. 5. The power battery thermal management system according to claim 4, wherein each of the heat dissipation devices comprises: a heat dissipation block and a heat dissipation fan, the heat dissipation fan is arranged on the heat dissipation block, and the heat dissipation block The other side of the semiconductor cooling chip is connected. 6. The power battery thermal management system according to claim 2, wherein the temperature adjustment device further comprises: a plurality of cooling fins arranged on the hollow plate, and a plurality of cooling fins arranged on the first side surface The plurality of heat dissipation fins and the plurality of semiconductor cooling fins arranged on the first side are interlaced, and the plurality of heat dissipation fins arranged on the second side are interlaced with the plurality of heat dissipation fins arranged on the second side. A plurality of said peltier cooling sheets are interlaced with each other. 7 . The power battery thermal management system according to claim 6 , wherein each of the heat dissipation fins is a staggered grid-shaped heat dissipation fin composed of a plurality of hollow heat dissipation fins. 8. The power battery thermal management system according to claim 1, characterized in that there are N battery components, N+1 phase change components, N battery components and N+1 phase change components. The phase change components are interlaced with each other, and both ends are the phase change components. 9. The power battery thermal management system according to claim 1, characterized in that, the power battery thermal management system further comprises: an insulation layer, and the insulation layer is arranged on the inner wall of the battery box. 10. The power battery thermal management system according to claim 9, characterized in that, the power battery thermal management system further comprises: a fireproof layer, the fireproof layer is arranged on the heat preservation layer away from the inner wall of the battery box .