CN110534840B - Battery module and battery heat exchange method - Google Patents

Battery module and battery heat exchange method Download PDF

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Publication number
CN110534840B
CN110534840B CN201910766069.8A CN201910766069A CN110534840B CN 110534840 B CN110534840 B CN 110534840B CN 201910766069 A CN201910766069 A CN 201910766069A CN 110534840 B CN110534840 B CN 110534840B
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China
Prior art keywords
heat exchange
battery
temperature
exchange device
box body
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CN201910766069.8A
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CN110534840A (en
Inventor
周见军
谭健
贾术
杨超
刘艳
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Sunwoda Electronic Co Ltd
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Sunwoda Electronic Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • H01M10/633Control systems characterised by algorithms, flow charts, software details or the like
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • H01M10/637Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/64Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647Prismatic or flat cells, e.g. pouch cells
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6551Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6554Rods or plates
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6556Solid parts with flow channel passages or pipes for heat exchange
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561Gases
    • H01M10/6563Gases with forced flow, e.g. by blowers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567Liquids
    • H01M10/6568Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/66Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/663Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a battery module and a battery heat exchange method, wherein the battery module comprises a battery pack, a first heat exchange device, a second heat exchange device and a control unit; the first heat exchange device comprises an exchange component for medium flowing through for heat exchange, and the exchange component is attached to and covers a battery pole of the battery pack; the second heat exchange device comprises a box body, the battery pack is placed in the box body, one side of the box body is provided with an air inlet, and the other side of the box body is provided with an air outlet; the control unit is arranged on the outer wall of the box body and respectively controls the exchange part to carry out heat exchange, and controls the air inlet to carry out air inlet and the air outlet to carry out air outlet, the battery pack, the first heat exchange device for liquid/phase change heat exchange and the second heat exchange device for air heat exchange are combined to form a battery module, the two heat exchange devices can be started simultaneously or singly, the heat exchange efficiency is improved, and the energy is greatly saved.

Description

Battery module and battery heat exchange method
Technical Field
The present invention relates to the field of battery technology, and more particularly, to a battery module and a battery heat exchange method.
Background
With the rapid development of new energy automobiles, the market demand of power batteries widely applied to automobiles is continuously increased. However, the power battery is very sensitive to temperature, and under an inappropriate temperature condition, the power battery can be damaged, and the side reaction generating capacity of the battery is increased, so that the performance and the service life of the battery are reduced, even thermal runaway can be caused, and a great safety risk is caused. Under the condition of low temperature, particularly under the condition of lower than 0 ℃, lithium gold branches are formed on the surface of an anode when the battery is charged, a diaphragm is punctured to cause internal short circuit, and fire explosion can occur under serious conditions; under high temperature conditions, such as temperatures above 35 ℃, the side reaction capability of the battery active material and the electrolyte is increased, so that the internal pressure of the battery is increased too fast, and the cycle life and the safety performance of the battery are affected.
At present, the battery module mainly adjusts the working temperature of the battery through a battery thermal management system. In the prior art, the battery thermal management scheme mainly comprises: wind heat exchange, liquid heat exchange, and phase change heat exchange. In the existing schemes of wind heat exchange, liquid heat exchange and phase change heat exchange, heat exchange is mainly carried out on the battery module through a U-shaped channel in the battery module. According to the heat exchange scheme, on one hand, the U-shaped temperature distribution of the module is generated, so that the temperature of the battery in the middle of the module is higher than that of the battery on two sides, and the heat exchange effect is poor; on the other hand makes battery temperature distribution inhomogeneous because electric core self structure, and its surface is wrapped by the insulating film, separates a rete between shell and the book core for high temperature zone distributes on positive negative utmost point post, and the medium temperature is distinguished and is distributed inside rolling up the core, and low temperature is distinguished and is distributed around rolling up the core and below, if carry out the heat exchange through above-mentioned heat exchange mode then inefficiency lead to with high costs, and can't guarantee the whole temperature uniformity of battery cell in the module.
Disclosure of Invention
The invention mainly aims to provide a battery module and a battery heat exchange method, and aims to solve the technical problem that the existing battery module is poor in heat exchange effect.
Based on the above object, the present invention provides a battery module, which includes a battery pack, a first heat exchanging device, a second heat exchanging device, and a control unit;
the first heat exchange device comprises an exchange component for medium flowing through for heat exchange, and the exchange component is attached to and covers a battery pole of the battery pack;
the second heat exchange device comprises a box body, the battery pack is placed in the box body, one side of the box body is provided with an air inlet, and the other side of the box body is provided with an air outlet;
the control unit is arranged on the outer wall of the box body and respectively controls the exchange part to carry out heat exchange and controls the air inlet to carry out air inlet and the air outlet to carry out air outlet.
Further, the exchange component comprises an exchange plate, a first inlet and a first outlet, a channel is arranged in the exchange plate, and the first inlet and the first outlet are respectively arranged at two ends of the channel, which are in contact with the outside.
Further, the channel is formed by connecting a plurality of S-shaped pipelines in sequence.
Further, the exchange component further comprises an insulating heat-conducting plate, a battery pole of the battery pack is connected through a connecting sheet, so that the battery pack forms electric connection, the insulating heat-conducting plate is attached to and covered on the connecting sheet, and the exchange plate is attached to and covered on the insulating heat-conducting plate.
Further, the tab is elongated, and a cross section between the battery and the cell in the tab is smaller than a cross section of a position in the tab connected to the battery.
Furthermore, the second heat exchange device further comprises a plurality of isolation plates corresponding to the number of the batteries, and each isolation plate is fixedly arranged on one side of one battery and is arranged between every two batteries.
Further, the device comprises a plurality of temperature sensors, humidity sensors and electromagnetic valves;
the control unit is electrically connected with the temperature sensor, the humidity sensor and the electromagnetic valve respectively;
the temperature sensors are respectively arranged on the side walls of the first inlet and the air inlet and on the side of the battery pack and are respectively used for detecting the temperature of the medium, the temperature of the air input into the box body and the temperature of the battery;
the humidity sensor is arranged at the air inlet and used for detecting the humidity of the air input into the box body;
the electromagnetic valves are arranged at the first inlet and the air inlet and are respectively used for limiting the flow speed of the medium and the wind speed of the wind input into the box body.
The invention also provides a heat exchange method applied to the battery module, which comprises the following steps:
acquiring the current temperature of the battery pack;
judging whether the current temperature is in a preset normal temperature range or not;
if not, starting a corresponding heat exchange device according to the current temperature and a preset rule so as to adjust the current temperature to the normal temperature range, wherein the heat exchange device comprises the first heat exchange device and the second heat exchange device.
Further, the air inlet is communicated with an air outlet of an air conditioner, and the step of opening the corresponding heat exchange device according to the current temperature and a preset rule so as to adjust the current temperature to the normal temperature range comprises the following steps:
judging whether the current temperature is in a specified range, wherein the specified range is a higher overheating range than the normal temperature range or a lower supercooling range than the normal temperature range;
if the current temperature is in the specified range, starting the second heat exchange device when the air conditioner is started, and starting the first heat exchange device when the air conditioner is not started;
and if the current temperature is not in the specified range, starting the first heat exchange device, and simultaneously starting the second heat exchange device when the air conditioner is started.
Further, the step of activating the second heat exchanging apparatus when the air conditioner is turned on includes:
detecting a wind temperature and a wind humidity of wind delivered by the air conditioner;
comparing the wind temperature with the current temperature, and comparing the wind humidity with a preset threshold value;
when the current temperature is in an overheating range, the wind temperature is lower than the current temperature, and the rheumatism degree is lower than a preset threshold value, the second heat exchange device is started;
and when the current temperature is in a supercooling range, the wind temperature is hotter than the current temperature, and the rheumatism degree is lower than a preset threshold value, starting the second heat exchange device.
According to the battery module and the battery heat exchange method provided by the invention, the battery pack is combined with the first heat exchange device for liquid/phase change heat exchange and the second heat exchange device for wind heat exchange to form the battery module, and the two heat exchange devices can be started simultaneously or singly, so that the heat exchange efficiency is improved, the energy is greatly saved, and the reliability of a battery heat management system is also improved.
Drawings
Fig. 1 is an exploded view of a battery module according to an embodiment of the present invention;
fig. 2 is an exploded view of a battery module according to another embodiment of the present invention;
fig. 3 is a schematic diagram of the method steps of a battery heat exchange method according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 2, the battery module according to the present invention includes a battery pack, a first heat exchanging device, a second heat exchanging device, and a control unit, wherein the battery pack includes a plurality of batteries 100, and the batteries 100 are connected in series.
The first heat exchange means is a liquid/phase change heat exchange means comprising an exchange element for a medium to flow through for heat exchange. Specifically, the plurality of batteries 100 are arranged side by side in the same direction to form the battery pack, that is, the battery posts 110 of the batteries 100 are all facing the same side, so that the battery pack is electrically connected in series, and the exchange member is attached to and covers the battery posts 110, and one surface of the exchange member, which is in contact with the battery posts 110, is made of an insulating material. According to the battery temperature distribution rule and the force of each component of the battery 100, when the battery 100 works, the high-temperature regions are distributed on the positive electrode and the negative electrode of the battery 100, and the battery post 110 has high-efficiency heat conduction capacity. And heat exchange is performed through the battery post 110, so that heat conduction efficiency can be increased, the area of an exchange part can be reduced, and certain cost can be reduced.
The second heat exchange device is an air heat exchange device, and includes a case 400, the battery pack is placed inside the case 400, one side of the case 400 is provided with an air inlet 410 for inputting air into the case 400, and the other side of the case 400 is provided with an air outlet 420 for exhausting air inside the case 400. The air inlet 410 may be connected to an air outlet of an air conditioner or other air delivery devices, and the present invention does not limit the source of air. Specifically, the air inlet 410 and the air outlet 420 are disposed on two sides of the box 400, the air inlet 410 is disposed on the upper end of the side wall of the box 400, and the air outlet 420 is disposed on the lower end of the side wall of the box 400, so that air can be sufficiently moved from one end of the inside of the box 400 to the other end of the inside of the box 400, and air-heat exchange is more sufficient.
The control unit is disposed on an outer wall of the box 400, and the control unit may be a chip in a battery thermal management system in the prior art, and is configured to control heat exchange of the battery pack, specifically control the exchange component to perform heat exchange, and control air inlet 410 and air outlet 420 of the second heat exchange device to supply air.
In the invention, the battery thermal management system is realized based on the battery module, the battery pack, the first heat exchange device and the second heat exchange device are combined to form the battery module, the two heat exchange devices can be started simultaneously or singly, and the reliability of the battery thermal management system is greatly improved.
In one embodiment, the exchange component includes an exchange plate 310, a first inlet 330 and a first outlet 340, the exchange plate 310 is provided with a channel therein, a medium flows through the channel to exchange heat with the battery post 110, the first inlet 330 and the first outlet 340 are respectively disposed at two ends of the channel contacting with the outside, in this embodiment, the first inlet 330 is disposed at one end of the exchange plate 310, the first outlet 340 is disposed at the other opposite end of the exchange plate 310, and the medium may be water or a water glycol mixture.
In one embodiment, the channels inside the exchange plate 310 are formed by connecting a plurality of S-shaped pipes in sequence, and preferably by horizontally folding and arranging a plurality of S-shaped pipes, so that the medium can uniformly flow through each position of the exchange plate 310, thereby ensuring the temperature of the whole exchange plate 310 to be consistent and achieving better heat exchange effect.
In one embodiment, in order to better dissipate heat and prevent the risk of external short circuit of the battery pack, the exchange component includes an insulating heat conduction plate 320, the battery poles 110 in the battery pack are connected by a connection sheet 200 to form the series connection, the insulating heat conduction plate 320 is attached to and covers the connection sheet 200, and the insulating heat conduction plate 320 and the connection sheet 200 can be fixed by heat conduction glue or fasteners, the insulating heat conduction plate 320 has high-efficiency heat conduction capability, and is prepared by mixing a filling material such as metal oxides Al2O3, ZnO, NiO, metal nitrides AlN, Si3N4, BN, inorganic silicon dioxide, and the like with a high polymer material, and the thermal conductivity range is 0.8-100W/mK.
In this embodiment, the battery post 110 is connected to positive and negative current collectors (specifically, copper foil and aluminum foil), has a copper thermal conductivity of about 401W/mK and an aluminum thermal conductivity of about 237W/mK, has a high thermal conductivity, and can rapidly and efficiently transfer heat; the connecting sheet 200 is made of aluminum and fixed above the battery 100 pole 110 by laser welding, has conductivity, further increases the heat dissipation area of the battery pole 110, and achieves the purpose of high-efficiency heat exchange.
Preferably, the insulating heat conducting plate 320 is close to one side surface of the connecting sheet 200 and has a protrusion or a depression matched with the surface of the connecting sheet 200 in a concave-convex manner, so that the insulating heat conducting plate 320 is tightly combined with the connecting sheet 200 when covering the connecting sheet 200, and is fully contacted, thereby enhancing the firmness and increasing the contact area to improve the heat conduction; the other side of the insulating heat conducting plate 320 is matched and attached with the exchange plate 310, namely, the contact surface of the insulating heat conducting plate 320 and the exchange plate 310 is matched and tightly combined in a concave-convex way, so that the insulating heat conducting plate 320 and the exchange plate are fully contacted, and the thickness range of the insulating heat conducting plate 320 can be 2-10 mm.
Preferably, the insulating heat conducting plate 320 is detachably connected to the exchange plate 310, and may be integrally and fixedly connected to the exchange plate 310. When the battery pack is made smaller in size or generates less heat, the widths of the insulating heat-conducting plate 320 and the exchange plate 310 can be reduced, thereby reducing the volume and the corresponding cost; when the size of the battery pack is large or heat generation is large, the widths of the insulating heat-conducting plate 320 and the exchange plate 310 can be increased appropriately, and thus the contact area thereof is increased, so that heat exchange is performed more efficiently, and normal operation of the battery 100 is satisfied.
In one embodiment, the two connecting sheets 200 are elongated and are connected to the battery post 110 of each battery 100 along the side-by-side direction of the battery 100, for example, one connecting sheet 200 is connected to the positive electrode of each battery 100 along the side-by-side direction of the battery 100, the other connecting sheet 200 is connected to the negative electrode of each battery 100 along the side-by-side direction of the battery 100, the connecting sheet 200 is made of a metal sheet and has a thickness of 2-8mm, a circular or square through hole is formed at the position where the connecting sheet 200 is connected to the post 110 for positioning the post 110, and the connecting sheet 200 can be welded to the post 110 through the through hole. The cross section of the connecting sheet 200 is smaller than that of the connecting sheet 200 and the battery 100 between the battery 100 and the battery 100, for example, the connecting sheet 200 is U-shaped between the battery 100 and the battery 100, so that the connecting sheet 200 at the position is easy to bend, when the batteries 100 are arranged side by side, the top ends of the battery poles 110 may be in the same plane, and the connecting sheet 200 can be folded and folded to be attached to each other. Furthermore, the insulating heat conducting plate 320 and the exchanging plate 310 are correspondingly provided with two corresponding connecting sheets 200, so as to ensure efficient heat conduction.
In one embodiment, the case 400 is a rectangular parallelepiped, the inside of the case is a layered structure, a bottom supporting plate 600 is disposed on the bottom of the case, the bottom supporting plate 600 is made of steel, an insulating silica gel plate is covered on the top layer of the bottom supporting plate 600, the thickness of the bottom supporting plate is 3-10mm, the bottom supporting plate 600 is 2-5mm away from the bottom of the case 400 for air flowing, the bottom supporting plate 600 has fixing holes corresponding to the number of the batteries 100, the bottoms of the batteries 100 are fitted into the fixing holes, and preferably, the bottom supporting plate 600 and the case 400 are integrally formed, so that the two are relatively stable.
In one embodiment, in order to further fix the battery 100, the second heat exchanging device further includes a plurality of separators 500 corresponding to the number of the batteries 100, each separator 500 is fixedly disposed at one side of one battery 100, and is disposed between every two batteries 100, for example, adhered to the surface of the battery 100 by the separator 500, the separator 500 is fixedly coupled at the lower end thereof to the bottom plate 600, and at the upper end thereof spaced apart from the top of the case 400, for the passage of cold/warm wind, thereby ensuring a sufficient flow volume among the cells 100 such that each cell 100 is surrounded in the cold/warm wind, ensuring that each cell 100 operates in a uniform temperature environment, the separator 500 may be made of a polymer material, such as phenol resin, polystyrene, etc., and has a thickness of 1-5mm, a size determined by the length, width and height of the battery 100, and a width of 2-10 mm.
In one embodiment, the battery module further includes a plurality of temperature sensors, humidity sensors, and electromagnetic valves; specifically, the control unit is electrically connected to a temperature sensor, a humidity sensor, and an electromagnetic valve, wherein the temperature sensor is disposed on the side wall of the first inlet 330, the side wall of the air inlet 410, and the side of the battery pack, and is used for detecting the temperature of the medium flowing through the first inlet 330, the temperature of the air flowing through the air inlet 410 and the temperature of the battery 100; the humidity sensor is arranged at the position of the air inlet 410 and used for detecting the humidity of the air input into the box body 400; the electromagnetic valves are disposed at the positions of the first inlet 330 and the air inlet 410, and are respectively used for limiting the flow rate of the medium in the first inlet 330 and the air speed of the air input into the box 400 in the air inlet 410, specifically, the control unit controls the electromagnetic valves to operate according to the different temperatures of the batteries, so that the air speeds entering the box 400 are different, or the flow rates flowing through the exchanging plate 310 are different, for example, when the temperature range of the batteries is slightly higher than the normal temperature, the electromagnetic valves can be controlled to reduce the air speeds or the flow rates; or according to the relationship between the temperature rise and fall of the battery and the time, the electromagnetic valve is controlled to work to change the wind speed or the flow speed at different battery temperatures and different time periods, so that the energy is saved most on the basis of maximizing the heat exchange rate.
Preferably, the air input from the air inlet 410 of the second heat exchanging device may be air conditioner outlet or air conditioner cold/warm air exhausted from the interior of the vehicle, an air dryer is installed at the air inlet 410 for absorbing moisture in the air, preventing the moisture from entering the interior of the case 400, preventing the metal structural member from being corroded and preventing the battery 100 from being short-circuited, and the air dryer is detachably connected to the air inlet pipe of the air inlet 410 for facilitating replacement.
When the battery heat exchange system works, the control unit monitors the working states of the battery 100 and the heat management system through the humidity sensor and the temperature sensor, and controls the electromagnetic valve through output signals, so that the flow of a heat exchange medium is changed. Specifically, after the battery 100 is started to operate, a temperature sensor installed in the battery pack collects a temperature signal of the battery 100 and transmits the temperature signal to the control unit, the control unit analyzes the temperature signal in real time, whether the temperature value of the battery pack is within a preset reasonable range is judged, if yes, the heat exchange device does not need to be started, if not, the first heat exchange device or/and the second heat exchange device is started according to a preset rule, for example, when the temperature of the battery 100 is low, the air-cooled second heat exchange device is used for carrying out heat exchange, when the temperature of the battery 100 is high, the liquid-cooled first heat exchange device is used for carrying out heat exchange, and when the temperature of the battery 100 deviates from a preset operating temperature, the first heat exchange device and the second heat exchange device can be started simultaneously for carrying out heat exchange.
In an embodiment, the battery pack has a plurality of battery modules, that is, the corresponding battery modules also have a plurality of battery modules, the plurality of battery modules are controlled and managed by a total thermal management control unit, and the total thermal management control unit is connected with the control unit of each battery module and is used for coordinating each battery module to work under a proper environment, so that the uniformity of each battery pack is ensured.
The principle of the second heat exchange device for air cooling heat exchange is as follows: the heat is transferred through the battery aluminum shell and the insulating film, and then is subjected to heat exchange with the wind, so that the effect of cooling or heating is achieved.
The first heat exchange principle for performing liquid/phase change heat exchange is: the heat of the battery 100 is mainly conducted to the insulating heat conducting plate 320 through the current collector, the pole 110 and the connecting sheet 200, and then conducted to the exchanging plate 310, and finally, heat exchange is carried out through the medium, so as to achieve the effect of temperature reduction or temperature rise.
Referring to fig. 3, the present invention further provides a battery heat exchange method, which is implemented by the battery module, and specifically, the battery heat exchange method includes:
step S1: acquiring the current temperature of the battery pack;
step S2: judging whether the current temperature is in a preset normal temperature range or not;
step S3: if not, starting a corresponding heat exchange device according to the current temperature and a preset rule so as to adjust the current temperature to the normal temperature range, wherein the heat exchange device comprises the first heat exchange device and the second heat exchange device.
As described in the above steps S1-S2, when the battery 100 starts to operate, the control unit sends a signal to the temperature sensor of the battery pack, so that the temperature sensor obtains the current temperature of the battery pack, and sends the current temperature to the control unit, and the control unit determines whether the current temperature is within a preset normal temperature range after obtaining the current temperature, where the normal temperature range may be set according to an actual situation that the battery 100 can operate normally, for example, the temperature range is 20 to 30 ℃, and if the current temperature is within the normal temperature range, it indicates that the battery 100 is in a normal operating environment, and heat exchange is not required.
As described in step S3, if the current temperature is not within the normal temperature range, that is, the current temperature may be too high or too low, the control unit may turn on the corresponding heat exchange device according to the current temperature according to the preset rule, that is, turn on the first heat exchange device or/and the second heat exchange device, so as to adjust the current temperature to fall within the normal temperature range.
In one embodiment, the air inlet 410 is connected to the air outlet of the air conditioner, that is, the wind input from the air inlet 410 by the second heat exchanging apparatus is the wind exhausted by the air conditioner, and the step S3 includes:
step S31: judging whether the current temperature is in a specified range, wherein the specified range is a higher overheating range than the normal temperature range or a lower supercooling range than the normal temperature range;
step S32: if the current temperature is in the specified range, starting the second heat exchange device when the air conditioner is started, and starting the first heat exchange device when the air conditioner is not started;
step S33: and if the current temperature is not in the specified range, starting the first heat exchange device, and simultaneously starting the second heat exchange device when the air conditioner is started.
As described in the above step S31, the control unit first determines whether the current temperature is within a specified range, which is a slightly higher overheating range than the normal temperature range, or a slightly lower supercooling range than the normal temperature range, for example, the normal temperature range is 20 to 30 ℃, the overheating range is 30 to 45 ℃, and the supercooling range is 0 to 20 ℃.
As described in step S32, if the current temperature is within the specified range, the control unit first determines whether the air conditioner is turned on, and it is required to know that the control unit is connected to the air conditioning system, and when the air conditioner is turned on, an on signal is sent to the control unit, and if the air conditioner is turned on, the second heat exchange device for performing air-heat exchange is started, and further, the rate of entering the interior of the box 400 can be adjusted by controlling the battery valve, so as to adjust the temperature of the module to a reasonable working interval; if the air conditioner is in a closed state, the first heat exchange device for liquid/phase change is started, and meanwhile, the heat exchange rate can be adjusted by controlling the battery valve, so that the temperature of the adjusting module reaches a reasonable working interval, the liquid/phase change heat exchange mode can be started to replace the function of the air conditioner when the air conditioner breaks down, and the reliability of the air conditioner is improved.
As shown in step S33, if it is determined that the current temperature is not within the specified range, that is, the current temperature is far from the normal and reasonable operating temperature range, for example, the current temperature is lower than 0 ℃ or higher than 45 ℃, it may be determined whether the air conditioner is turned on first, and if the air conditioner is turned on, the first heat exchanging device and the second heat exchanging device are turned on at the same time to cooperate with each other to achieve efficient and energy-saving heat exchange, or only the first heat exchanging device is turned on to operate when the air conditioner is not turned on.
In another embodiment, if the air conditioner is not turned on, the air conditioner may be turned on first, and then the second heat exchanging device may be turned on, or other devices for delivering air may be provided, and when the air conditioner is not turned on, the devices may be turned on, and then the second heat exchanging device may be turned on.
In the embodiment, when the current temperature is in the temperature range of 0-20 ℃ or 30-45 ℃, the second heat exchange device for wind-heat exchange is preferentially started, air-conditioned air passes through the dryer and the electromagnetic valve to reach the interior of the module for heat exchange, so that the working temperature of the battery 100 is reduced, the cycle performance and the safety performance of the battery 100 are better improved, the air inlet amount can be controlled through the electromagnetic valve, the air inlet amount can be adjusted according to the temperature, and when the air conditioner is not started and the second heat exchange device does not work, the first heat exchange device can be started to work; if the current temperature is higher than 45 ℃ or lower than 0 ℃, the first heat exchange device is started to work, and the entering amount of heat exchange media can be adjusted through the electromagnetic valve according to the temperature, so that the battery 100 can work at a reasonable environment temperature, and meanwhile, the second heat exchange device can also be started.
In addition, when the second heat exchange device fails, the first heat exchange device can be independently started, or when the first heat exchange device fails, the second heat exchange device is independently started, so that the normal operation of the battery heat exchange system is ensured, and the reliability of the battery heat exchange system is further improved. The air source for air-heat exchange in the battery heat exchange system is cold/warm air discharged by an automobile air conditioner, and residual cold/warm air is recycled, so that the energy-saving effect can be achieved; the invention can meet the requirement of safe and reliable operation of the power electric automobile under different climates or working conditions, so that the battery heat exchange system has higher efficiency and lower consumption.
In one embodiment, the step of activating the second heat exchanging means when the air conditioner is turned on in step S32 or/and step S33 includes:
step S41: detecting a wind temperature and a wind humidity of wind delivered by the air conditioner;
step S42: comparing the wind temperature with the current temperature, and comparing the wind humidity with a preset threshold value;
step S43: when the current temperature is in an overheating range, the wind temperature is lower than the current temperature, and the rheumatism degree is lower than a preset threshold value, the second heat exchange device is started;
step S44: and when the current temperature is in a supercooling range, the wind temperature is hotter than the current temperature, and the rheumatism degree is lower than a preset threshold value, starting the second heat exchange device.
In this embodiment, the second heat exchanger is turned on through the above steps, the temperature of the air input from the air conditioner is detected by the temperature sensor of the air inlet 410, the humidity of the air input from the air conditioner is detected by the humidity sensor of the air inlet 410, the air temperature is compared with the current temperature, the air humidity is compared with the preset threshold, the air inlet 410 is turned on only when the air temperature and the air humidity both meet the requirement of entering the interior of the box 400, and the air input from the air conditioner enters the interior of the box 400. If the current temperature is in the supercooling range, and the battery 100 needs to be heated at this time, the wind temperature is detected to be hotter than the current temperature, and the rheumatism degree is lower than the preset threshold value, at this time, the second heat exchange device can be started, otherwise, the second heat exchange device is not started.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (4)

1. A battery heat exchange method is applied to a battery module and is characterized in that the battery module comprises a battery pack, a first heat exchange device, a second heat exchange device and a control unit;
the first heat exchange device comprises an exchange component for medium flowing through for heat exchange, and the exchange component is attached to and covers a battery pole of the battery pack;
the second heat exchange device comprises a box body, the battery pack is placed in the box body, one side of the box body is provided with an air inlet, and the other side of the box body is provided with an air outlet;
the control unit is arranged on the outer wall of the box body and respectively controls the exchange part to carry out heat exchange and controls the air inlet to carry out air inlet and the air outlet to carry out air outlet;
the exchange component comprises an exchange plate, a first inlet and a first outlet, a channel is arranged in the exchange plate, and the first inlet and the first outlet are respectively arranged at two ends of the channel, which are in contact with the outside;
the exchange component further comprises an insulating heat-conducting plate, the battery poles of the battery pack are connected through connecting sheets, the insulating heat-conducting plate is attached to and covers the connecting sheets, the exchange plate is attached to and covers the insulating heat-conducting plate, and the insulating heat-conducting plate is close to one side face of the connecting sheets and is provided with bulges or depressions matched with the surface of the connecting sheets in a concave-convex mode;
the second heat exchange device also comprises a plurality of isolation plates corresponding to the number of the batteries, and each isolation plate is fixedly arranged on one side of one battery and is arranged between every two batteries;
the box body is rectangular, the interior of the box body is of a layered structure, a bottom supporting plate is arranged on the bottom of the box body, a layer of insulating silica gel plate covers the upper layer of the bottom supporting plate, and a gap is formed between the bottom supporting plate and the bottom of the box body; the lower end of the isolation plate is fixedly connected with the bottom supporting plate, and a gap is formed between the upper end of the isolation plate and the top of the box body;
the connecting sheet is in a long strip shape, and the cross section of the connecting sheet between the battery and the battery is smaller than the cross section of the connecting sheet at the position connected with the battery; the connecting sheet is positioned between the batteries and is in a U shape;
the method comprises the following steps:
acquiring the current temperature of the battery pack;
judging whether the current temperature is in a preset normal temperature range or not;
if not, starting a corresponding heat exchange device according to the current temperature and a preset rule so as to adjust the current temperature to the normal temperature range, wherein the heat exchange device comprises the first heat exchange device and the second heat exchange device;
the air inlet is communicated with an air outlet of an air conditioner, and the corresponding heat exchange device is opened according to the current temperature according to a preset rule so as to adjust the current temperature to the normal temperature range, wherein the step comprises the following steps:
judging whether the current temperature is in a specified range, wherein the specified range is a higher overheating range than the normal temperature range or a lower supercooling range than the normal temperature range;
if the current temperature is in the specified range, starting the second heat exchange device when the air conditioner is started, and starting the first heat exchange device when the air conditioner is not started;
and if the current temperature is not in the specified range, starting the first heat exchange device, and simultaneously starting the second heat exchange device when the air conditioner is started.
2. The battery heat exchanging method as claimed in claim 1, wherein the channel is formed by connecting a plurality of S-shaped pipes in sequence.
3. The battery heat exchanging method as claimed in claim 1, wherein the battery module further comprises a plurality of temperature sensors, humidity sensors, electromagnetic valves;
the control unit is electrically connected with the temperature sensor, the humidity sensor and the electromagnetic valve respectively;
the temperature sensors are respectively arranged on the side walls of the first inlet and the air inlet and on the side of the battery pack and are respectively used for detecting the temperature of the medium, the temperature of the air input into the box body and the temperature of the battery;
the humidity sensor is arranged at the air inlet and used for detecting the humidity of the air input into the box body;
the electromagnetic valves are arranged at the first inlet and the air inlet and are respectively used for limiting the flow speed of the medium and the wind speed of the wind input into the box body.
4. The battery heat exchanging method as claimed in claim 3, wherein the step of activating the second heat exchanging means when the air conditioner is turned on comprises:
detecting a wind temperature and a wind humidity of wind delivered by the air conditioner;
comparing the wind temperature with the current temperature, and comparing the wind humidity with a preset threshold value;
when the current temperature is in an overheating range, the wind temperature is lower than the current temperature, and the rheumatism degree is lower than a preset threshold value, the second heat exchange device is started;
and when the current temperature is in a supercooling range, the wind temperature is hotter than the current temperature, and the rheumatism degree is lower than a preset threshold value, starting the second heat exchange device.
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