CN112599887B - Battery heat dissipation method, battery heat dissipation device and battery pack - Google Patents
Battery heat dissipation method, battery heat dissipation device and battery pack Download PDFInfo
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- CN112599887B CN112599887B CN202011492798.8A CN202011492798A CN112599887B CN 112599887 B CN112599887 B CN 112599887B CN 202011492798 A CN202011492798 A CN 202011492798A CN 112599887 B CN112599887 B CN 112599887B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a battery heat dissipation method, a battery heat dissipation device and a battery pack, and belongs to the field of automobile batteries. The battery heat dissipation method comprises the following steps: s1, measuring a temperature parameter T of a preset position of the battery pack; s2, calculating the first derivative of T and time to obtain T ', and calculating the second derivative of T and time to obtain T'; s3, judging whether T' is larger than a first preset value a, if yes, carrying out S4, otherwise, carrying out S5; s4, judging whether T is larger than a second preset value T1, if yes, starting the liquid cooling system, and if not, carrying out S5; s5, judging whether T' is larger than a third preset value b, if yes, carrying out S6, and if not, carrying out S7; s6, judging whether T is larger than a fourth preset value T2, if so, starting the liquid cooling system, and otherwise, starting the air cooling system; and S7, judging whether T is larger than a fifth preset value T3, T3 is larger than T2 is larger than T1, if yes, starting the air cooling system, and if not, returning to S3. The battery pack has the advantages that the battery pack has air-cooled heat dissipation and liquid-cooled heat dissipation, the cooling mode can be switched according to the requirement, the cooling efficiency is improved, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of automobile batteries, in particular to a battery heat dissipation method, a battery heat dissipation device and a battery pack.
Background
"battery system" refers to an energy storage device consisting of one or more battery packs and corresponding accessories (management system, high-voltage circuit, low-voltage circuit, thermal management apparatus, mechanical assembly, etc.). The "battery pack" refers to a unit that obtains electric power from the outside and can output the electric power to the outside.
At present, the power battery is widely applied to new energy commercial vehicles, and hybrid vehicle models gradually become the mainstream of future development of commercial vehicles. Different from passenger vehicles, the power and energy of the power battery required by the commercial vehicle are often larger than those of the passenger vehicle, so that higher requirements are placed on the performance of the battery, the structure of the battery pack and a heat management mode.
At present, the heat dissipation mode of the battery pack mostly adopts a forced air cooling heat dissipation mode or a liquid cooling heat dissipation mode. Wherein:
the forced air cooling heat dissipation mode is that the flow speed of cooling air flowing through the surface of the battery is improved through a fan, so that the cooling purpose is achieved. The key part adopted by the forced air cooling is a fan, and the integral heat dissipation device and the structure are simpler and have lower cost. However, the battery pack has a large volume because the battery pack is internally provided with a gap for air circulation by adopting a forced air cooling heat dissipation mode alone. In addition, the heat dissipation efficiency is not high due to the thermal characteristics of air, and the temperature of the battery cannot be rapidly reduced.
And (II) the liquid cooling heat dissipation mode adopts a water pump to drive a cooling medium (namely cooling liquid) to circulate in a heat dissipation pipeline, and the heat dissipation pipeline is in contact with the battery, so that the heat generated by the battery is taken away through the cooling medium, and the heat dissipation effect is good. However, the liquid cooling heat dissipation mode is adopted independently, and the compressor and the water pump need to be started after the temperature of the battery exceeds the temperature limit value, so that the cooling effect is good, but the energy consumption of the compressor is high. In addition, under the current electric vehicle architecture, the compressor and the water pump both obtain energy from the battery, so that the driving range of the electric vehicle is inevitably affected.
Therefore, how to make the battery pack have both cooling efficiency and energy saving effects is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a battery heat dissipation method, a battery heat dissipation device suitable for the battery heat dissipation method, and a battery pack, wherein the battery pack is provided with a liquid cooling system and an air cooling system, so that the battery pack can achieve both cooling effect and energy saving effect.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for dissipating heat from a battery, comprising:
step S1: measuring to obtain a temperature parameter T of a preset position of the battery pack;
step S2: calculating a first derivative of the temperature parameter T and time to obtain a first parameter T', and calculating a second derivative of the temperature parameter T and time to obtain a second parameter T ";
step S3: judging whether the second parameter T' is greater than a first preset value a, if so, performing step S4, otherwise, performing step S5;
step S4: judging whether the temperature parameter T is greater than a second preset value T1, if so, starting the liquid cooling system, and otherwise, performing the step S5;
step S5: judging whether the first parameter T' is larger than a third preset value b, if so, performing step S6, otherwise, performing step S7;
step S6: judging whether the temperature parameter T is greater than a fourth preset value T2, wherein the fourth preset value T2 is greater than the second preset value T1, if so, starting the liquid cooling system, and otherwise, starting the air cooling system;
step S7: and judging whether the temperature parameter T is greater than a fifth preset value T3, wherein the fifth preset value T3 is greater than the fourth preset value T2, if so, starting the air cooling system, and if not, returning to the step S3.
Optionally, in the above battery heat dissipation method, the first preset value a is equal to zero; the third preset value b is equal to zero.
Optionally, in the above battery heat dissipation method, the temperature parameter T is an average temperature value of a plurality of measurement positions in the battery pack.
Optionally, in the above battery heat dissipation method, the measurement positions include a positive end measurement position, a middle measurement position, and a negative end measurement position of each battery module in the battery pack.
A battery heat sink, the battery heat sink comprising:
the measuring unit is used for measuring the temperature parameter T of the preset position of the battery pack;
the liquid cooling system is used for cooling the battery pack;
the air cooling system is used for cooling the battery pack;
a control unit for performing the steps S2 to S6 described hereinabove.
A battery pack comprises a lower shell and an upper cover, wherein the upper cover and the lower shell are buckled to form a cavity for accommodating a battery module; and the bottom of the lower shell is provided with an air circulation path in an air cooling system and a cooling liquid circulation path in a liquid cooling system.
Optionally, in the battery pack, the air circulation path is a through groove structure formed by recessing a bottom plate of the lower case, and the battery modules are respectively arranged on two sides of the air circulation path in the lower case;
and/or the cooling liquid circulation path is a flat through hole structure arranged in the bottom plate of the lower shell and is positioned right below the battery module.
Optionally, in the above battery pack, a fan is disposed outside the lower case, and an outlet of the fan is located at one end of the air circulation path and is communicated with the air circulation path.
Optionally, in the above battery pack, a gap between the inner surface of the lower case and the battery module is filled with a thermally conductive adhesive.
Optionally, in the above battery pack, the upper cover is made of a polymer composite material;
the lower shell is made of aluminum alloy.
According to the technical scheme, the battery heat dissipation method, the battery heat dissipation device and the battery pack have the functions of forced air cooling and liquid cooling heat dissipation, so that two cooling modes can be switched as required, the working efficiency of a battery pack cooling system is improved, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for dissipating heat from a battery according to an embodiment of the present invention;
fig. 2 and 3 are isometric views of a battery pack provided by an embodiment of the invention at different angles;
fig. 4 is a schematic diagram of an internal structure of a battery pack according to an embodiment of the present invention;
fig. 5 is a sectional view of section a-a in fig. 4.
Detailed Description
The invention discloses a battery heat dissipation method, a battery heat dissipation device suitable for the battery heat dissipation method and a battery pack.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The battery heat dissipation method provided by the embodiment of the invention comprises the following steps:
after the battery system is started, whether T 'is larger than zero is detected, and if not, whether T' is larger than zero is further judged. If T' is larger than zero, the temperature of the battery is increased in an accelerating way, and if T at the moment exceeds a threshold value T1, the liquid cooling function needs to be started immediately to rapidly cool the battery. If T does not reach the threshold T1, it indicates that the battery temperature is still within a reasonable range, and then it is determined whether T' is greater than zero. If T' is not greater than zero, it indicates that the battery temperature is dropping or temporarily remaining unchanged, and it is necessary to determine whether T is greater than a threshold T3. If T' is larger than zero, the temperature of the battery is marked to be rising, and if T at the moment exceeds a threshold value T2, the liquid cooling function needs to be started to cool the battery. Otherwise, only the forced air cooling is started. If T "is not greater than zero, T' is also not greater than zero, but T is greater than a threshold T3, it indicates that the battery temperature is high, but there is no significant increase, and only the forced air cooling needs to be turned on for cooling. Typically, we set T1 < T2 < T3.
Specifically, referring to fig. 1, the control logic of the battery heat dissipation method mainly includes the following steps:
step S1: after the battery system is started, firstly, a temperature parameter T of a preset position of the battery pack is measured, and the temperature parameter T is preferably an average temperature value of a plurality of measurement positions in the battery pack (but not limited to this, in other specific embodiments, a maximum temperature value or a minimum temperature value of the battery pack obtained by measurement or a temperature value of a certain specific position may also be used as the temperature parameter T);
step S2: calculating a first derivative of the temperature parameter T and time to obtain a first parameter T' (namely dT/dT); calculating a second derivative of the temperature parameter T and time to obtain a second parameter T '(namely dT'/dT);
step S3: determining whether the second parameter T ″ is greater than the first preset value a (the first preset value a is preferably zero, but is not limited thereto, and in specific implementation, the first preset value a may also be set as another parameter), if so, performing step S4, otherwise, performing step S5;
step S4: judging whether the temperature parameter T is greater than a second preset value T1, if so, starting the liquid cooling system, and otherwise, performing the step S5;
step S5: judging whether the first parameter T' is greater than a third preset value b (the third preset value b is preferably zero, but is not limited thereto, and in specific implementation, the third preset value b may also be set to other parameters), if so, performing step S6, otherwise, performing step S7;
step S6: judging whether the temperature parameter T is greater than a fourth preset value T2, and whether the fourth preset value T2 is greater than a second preset value T1, if so, starting the liquid cooling system, and otherwise, starting the air cooling system;
step S7: and judging whether the temperature parameter T is greater than a fifth preset value T3 or not, wherein the fifth preset value T3 is greater than or equal to a fourth preset value T2, if so, starting the air cooling system, and if not, returning to the step S3.
Therefore, in the battery heat dissipation method, the battery temperature is controlled by preferentially using forced air cooling under the condition that the battery temperature change rate is low but the average temperature is high, the mode is most economical and feasible, and the energy consumed on a heat dissipation system is minimum, so that the continuation of the journey of the electric automobile is guaranteed. In addition, in the method, liquid cooling heat dissipation is preferably selected only under the condition that the temperature change of the battery is severe. Therefore, the battery heat dissipation method has the advantages that the battery pack has two heat dissipation modes of forced air cooling and liquid cooling, the most economical cooling mode can be selected preferably according to the temperature change condition of the battery, the battery temperature is interfered in advance according to the acceleration of the temperature change of the battery, the battery can be ensured to work in a proper temperature range all the time, the performance of the battery is ensured not to be influenced by the temperature change, and the performance of the battery is exerted to the maximum extent. And because the forced air cooling and the liquid cooling are reasonably adopted according to the actual temperature change condition of the battery, better cooling efficiency can be ensured, and the purposes of economy and energy conservation can be achieved.
The battery heat dissipation device provided by the embodiment of the invention comprises a liquid cooling system, an air cooling system, a measuring unit and a control unit. The measuring unit is used for measuring a temperature parameter T of a preset position of the battery pack; the liquid cooling system is used for cooling the battery pack; the air cooling system is used for cooling the battery pack; the control unit is used for executing the steps S2 to S6 of the battery heat dissipation method.
Referring to fig. 2 to 5, a battery pack according to an embodiment of the present invention includes a lower case 2 and an upper cover 1, wherein the upper cover 1 and the lower case 2 are fastened to form a cavity for accommodating a battery module 5; the bottom of the lower case 2 is provided with an air circulation path 22 in an air cooling system, and a coolant circulation path 21 in a liquid cooling system. Here, the term "battery module" as used herein means: more than one battery monomer is combined in a series connection, parallel connection or series-parallel connection mode and used as a combined body of a power supply.
Specifically, two battery modules 5 are preferably arranged in one battery pack, three temperature sensors are arranged in each battery module 5, the three temperature sensors are respectively located at the positive end measuring position, the middle measuring position and the negative end measuring position of the battery module 5, a total of six temperature sensors are provided, and the arithmetic average value of the temperatures detected by the six temperature sensors is recorded as the temperature parameter T.
Referring to fig. 4 and 5, the air circulation path 22 is a through-groove structure formed by recessing the bottom plate of the lower case 2, and the battery modules 5 are respectively disposed at two sides of the air circulation path 22 in the lower case 2, that is, two battery modules 5 are arranged in parallel in the lower case 2 of the battery pack and are right at the left and right sides of the air circulation path 22; the coolant circulation path 21 is a flat through-hole structure provided in the bottom plate of the lower case 2 and located directly below the battery modules 5.
Specifically, referring to fig. 5, the bottom of the lower housing 2 includes a first vertical side plate, a first horizontal panel, a first vertical panel, a second horizontal panel, a second vertical panel, a third horizontal panel, and a second vertical side plate, which are connected in sequence. Wherein:
the first vertical side plate and the first vertical panel are respectively positioned above two sides of the first horizontal panel to form a first mounting cavity for accommodating the first battery module;
the second vertical panel and the second vertical side plate are respectively positioned above two sides of the third horizontal panel to form a second mounting cavity for accommodating a second battery module;
the first horizontal panel and the third horizontal panel are respectively provided with a cooling liquid circulation path 21;
the bottom recess formed by the first vertical panel, the second horizontal panel and the second vertical panel is an air flow path 22.
Preferably, the flat through-hole structure is formed by sealing the sealing plate 6 with the groove on the outer side of the lower case 2. Further, the cross-sectional shape of the coolant flow path 21 is preferably set to a flat rectangle whose horizontal side is a long side and vertical side is a short side in order to ensure the largest coverage area of the coolant at the bottom of the lower case 2 as possible.
That is, the air circulation path 22 is a groove structure integrally cast at the bottom of the lower casing 2, is located at the outer side of the lower casing 2, has a relatively large groove cross section, and forms an air cooling system together with the fan 4. The cooling liquid circulation path 21 is a groove structure integrally cast and formed at the bottom of the lower shell 2, is located at the outer side of the lower shell 2, has a relatively small groove section, is sealed by a sealing plate 6 to form a through hole type cavity, and is then connected with a cooling liquid circulation system to form a liquid cooling system.
Specifically, the sealing plate 6 and the lower housing 2 may be welded together by gas shielded welding, friction stir welding, or the like, thereby ensuring that the cooling liquid does not leak.
Specifically, referring to fig. 2 to 4, an air circulation path 22 is disposed in the middle of the bottom of the lower housing 2, two sides of the air circulation path 22 are respectively provided with a connector 3, the connector 3 is a standard structural member, and is provided with an inlet and an outlet for connecting an external coolant circulation pipeline; each interface 3 connects two coolant flow paths 21 in parallel with an air flow path 22. Thus, the two coolant circulation paths 21 communicating with the same port 3, the port 3, and the external coolant circulation line connected to the port 3 constitute a liquid cooling system.
Specifically, referring to fig. 3 and 4, the air circulation path 22 is located in the middle area of the bottom side of the lower casing 2, and is a through groove structure recessed from the bottom surface to the casing, which is a preset structure of the lower casing 2 itself. The outer side of the lower shell 2 is fixedly connected with the fan 4, and the air outlet of the fan 4 is opposite to one end of the air circulation path 22 to form an air cooling system, so that most of the air quantity of the fan 4 can flow through the air circulation path 22.
Specifically, a gap between the inner surface of the lower case 2 and the battery module 5 is filled with a thermally conductive paste. Specifically, referring to fig. 5, the bottom surface, the left side surface and the right side surface of the battery module 5 and the lower case 2 fill the gap with the heat conductive adhesive, so that the contact area between the battery module 5 and the lower case 2 is large and the heat conductivity is good, and the lower case 2 is integrally used as a heat sink for the battery module 5.
Specifically, the upper cover 1 is made of a high-molecular composite material, and is molded by injection molding, so that the light weight effect is obvious; the lower shell 2 is made of aluminum alloy and is formed by die casting, and the lower shell has good heat conduction performance.
Specifically, the battery pack is provided with the battery heat dissipation device and adopts the battery heat dissipation method.
In summary, the battery heat dissipation method, the battery heat dissipation device and the battery pack provided by the embodiments of the present invention have both the forced air cooling function and the liquid cooling function, and can switch between the two cooling modes as required, thereby improving the working efficiency of the cooling system and reducing the energy consumption.
It should be noted that, in other embodiments, the balance between the cooling effect and the energy saving can also be achieved to some extent by adjusting the variable factors of the battery cooling system, such as the flow rate, the temperature of the coolant, and the rotation speed of the fan. However, since the power of the air conditioner compressor is significantly higher than that of the fan, the energy requirement is significantly higher than that of the fan, and the energy-saving effect of the battery heat dissipation method and device cannot be achieved.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for dissipating heat from a battery, comprising:
step S1: measuring to obtain a temperature parameter T of a preset position of the battery pack;
step S2: calculating a first derivative of the temperature parameter T and time to obtain a first parameter T', and calculating a second derivative of the temperature parameter T and time to obtain a second parameter T ";
step S3: judging whether the second parameter T' is greater than a first preset value a, if so, performing step S4, otherwise, performing step S5;
step S4: judging whether the temperature parameter T is greater than a second preset value T1, if so, starting the liquid cooling system, and otherwise, performing the step S5;
step S5: judging whether the first parameter T' is larger than a third preset value b, if so, performing step S6, otherwise, performing step S7;
step S6: judging whether the temperature parameter T is greater than a fourth preset value T2, wherein the fourth preset value T2 is greater than the second preset value T1, if so, starting the liquid cooling system, and otherwise, starting the air cooling system;
step S7: and judging whether the temperature parameter T is greater than a fifth preset value T3, wherein the fifth preset value T3 is greater than the fourth preset value T2, if so, starting the air cooling system, and if not, returning to the step S3.
2. The method for dissipating heat from a battery according to claim 1, wherein the first preset value a is equal to zero; the third preset value b is equal to zero.
3. The method for dissipating heat from a battery according to claim 1, wherein the temperature parameter T is an average temperature value of a plurality of measurement locations in the battery pack.
4. The method for dissipating heat from a battery according to claim 3, wherein the measurement positions comprise a positive end measurement position, an intermediate measurement position, and a negative end measurement position of each battery module in the battery pack.
5. A battery heat sink for performing the battery heat dissipation method of any one of claims 1 to 4, the battery heat sink comprising:
the measuring unit is used for measuring the temperature parameter T of the preset position of the battery pack;
the liquid cooling system is used for cooling the battery pack;
the air cooling system is used for cooling the battery pack;
a control unit for performing the steps S2 to S7 of any one of claims 1 to 4.
6. A battery pack is characterized in that the battery heat dissipation device comprises a lower shell (2) and an upper cover (1), wherein the upper cover (1) is buckled with the lower shell (2) to form a cavity for accommodating a battery module (5);
the bottom of the lower shell (2) is provided with an air circulation path (22) in an air cooling system and a cooling liquid circulation path (21) in a liquid cooling system.
7. The battery pack according to claim 6, wherein the air flow path (22) is a through-groove structure formed by recessing a bottom plate of the lower case (2), and the battery modules (5) are respectively provided in both sides of the air flow path (22) in the lower case (2);
and/or the cooling liquid circulation path (21) is a flat through hole structure arranged inside the bottom plate of the lower shell (2) and is positioned right below the battery module (5).
8. The battery pack according to claim 7, wherein a fan (4) is provided outside the lower case (2), and an air outlet of the fan (4) is located at one end of the air circulation path (22) and communicates with the air circulation path (22).
9. The battery pack according to claim 6, wherein a gap between the inner surface of the lower case (2) and the battery module (5) is filled with a thermally conductive paste.
10. The battery pack according to any one of claims 6 to 9, wherein the upper cover (1) is made of a polymer composite material;
the lower shell (2) is made of aluminum alloy.
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| Publication number | Priority date | Publication date | Assignee | Title |
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