CN117543134A - Battery pack cooling control method and device and computer readable storage medium - Google Patents
Battery pack cooling control method and device and computer readable storage medium Download PDFInfo
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- CN117543134A CN117543134A CN202410037277.5A CN202410037277A CN117543134A CN 117543134 A CN117543134 A CN 117543134A CN 202410037277 A CN202410037277 A CN 202410037277A CN 117543134 A CN117543134 A CN 117543134A
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- 238000001816 cooling Methods 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 72
- 230000033228 biological regulation Effects 0.000 claims abstract description 54
- 239000000110 cooling liquid Substances 0.000 claims abstract description 23
- 230000001276 controlling effect Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 14
- 239000002826 coolant Substances 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 230000000875 corresponding effect Effects 0.000 description 43
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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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
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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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
-
- 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
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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)
Abstract
The invention provides a battery pack cooling control method, a battery pack cooling control device and a computer readable storage medium. The cooling channel is used for cooling the battery module to a preset temperature, and the flow regulating valve is used for regulating the flow of the cooling liquid flowing into the cooling channel. The method comprises the steps of obtaining a target regulation ratio of each flow regulating valve; and then controlling the opening of the flow regulating valve corresponding to each battery module according to the target regulating ratio of each flow regulating valve so as to regulate the flow of the cooling liquid flowing into the cooling channel corresponding to each battery module, thereby realizing the independent regulation and control of the flow of the cooling liquid on the cooling channel of each battery module, and being capable of respectively regulating the temperature of each battery module, thereby reducing the temperature difference of each battery module.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a battery pack cooling control method and apparatus, and a computer readable storage medium.
Background
With the continuous development of new energy, the requirements of people on energy storage batteries and power batteries are increasingly improved, and the battery pack is used as a battery set, so that the internal resistance difference of each battery is increased (such as mixed use of batteries in different batches, use of gradient batteries, natural aging of batteries and the like) for various reasons, so that the temperature difference of each battery in the charging and discharging processes is increased, and then the internal resistance difference of the battery is increased continuously to enter a vicious circle. The temperature difference of each battery reduces the energy which can be charged and discharged by the whole battery pack, thereby reducing the efficiency of the whole battery pack; meanwhile, an excessive temperature difference between batteries may cause overcharge and overdischarge, reduce the life of the batteries, and may cause thermal runaway of the batteries to cause fire.
Disclosure of Invention
In order to solve the above problems, the present invention provides a battery pack cooling control method, apparatus and computer readable storage medium, which can solve the technical problems of battery pack charging and discharging energy reduction, over-charging and over-discharging, battery life reduction and possible battery thermal runaway caused by temperature difference of each battery in a battery pack.
The invention provides a battery pack cooling control method, which comprises a plurality of battery modules, wherein each battery module is correspondingly provided with a flow regulating valve and a cooling channel, the cooling channel is used for cooling the battery module to a preset temperature, and the flow regulating valve is used for regulating the flow of cooling liquid flowing into the cooling channel, and the method comprises the following steps:
acquiring a first temperature value corresponding to each battery module and a first regulation ratio corresponding to each flow regulating valve at a first moment;
acquiring a second temperature value corresponding to each battery module at a second moment, wherein the first moment and the second moment are spaced by a preset time;
calculating a cooling speed according to vb= (Ta-Tb)/Ta/Ka, wherein Vb is the cooling speed of a cooling channel corresponding to each battery module in the preset time, ta is a first temperature value of each battery module at the first moment, tb is a second temperature value of each battery module at the second moment, ta is the preset time, and Ka is a first regulation ratio of a flow regulating valve corresponding to each battery module at the first moment;
calculating cooling time according to tmax= (Tbmax-Ts)/Vmax/Kamax, wherein tmax is cooling time required by cooling the battery module corresponding to the maximum value of the plurality of second temperature values to the preset temperature, tbmax is the maximum value of the plurality of second temperature values, ts is the preset temperature, vmax is cooling speed of the battery module corresponding to the maximum value of the plurality of second temperature values, and Kamax is a first regulation ratio of the flow regulating valve corresponding to the maximum value of the plurality of second temperature values;
calculating a target regulation ratio according to Kb= (Tb-Ts)/Vb/tmax multiplied by 100%, wherein Kb is the target regulation ratio of the flow regulating valve corresponding to each battery module;
and controlling the opening degree of the flow regulating valve corresponding to each battery module according to the target regulating ratio of each flow regulating valve so as to regulate the flow of the cooling liquid flowing into the cooling channel corresponding to each battery module.
Optionally, before the step of obtaining the first temperature value corresponding to each battery module and the first adjustment ratio corresponding to each flow rate adjustment valve at the first moment, the method includes:
obtaining module temperature values of a plurality of battery modules, and calculating a module temperature difference value between any two module temperature values;
and if the temperature difference value of at least one module is greater than or equal to the preset maximum temperature difference value, acquiring the target regulation ratio of each flow regulating valve.
Optionally, after the step of controlling the opening of the flow rate adjustment valve corresponding to each battery module according to the target adjustment ratio of each flow rate adjustment valve to adjust the flow rate of the cooling liquid flowing into the cooling channel corresponding to each battery module, the method includes:
and cooling the battery module to the preset temperature, and reducing the target regulation ratio to a second regulation ratio, wherein the second regulation ratio is used for maintaining the battery module at the preset temperature.
The invention also provides a battery pack cooling control device which is used for realizing any battery pack cooling control method, and comprises a water inlet main pipe, a water outlet main pipe, an inlet joint and an outlet joint; the cooling channels are arranged side by side, one end of each cooling channel is communicated with the water inlet main pipe, and the other end of each cooling channel is communicated with the water outlet main pipe; the water inlet main pipe is provided with the inlet joint; the water outlet main pipe is provided with the outlet joint.
Optionally, the system comprises a plurality of temperature sensors, wherein one end of each battery module close to the water outlet main pipe is provided with the temperature sensor, and the temperature sensor is used for acquiring the temperature value of the battery module.
Optionally, the intelligent control system comprises a battery management module and a temperature control module, wherein the battery management module is electrically connected with the temperature control module, the temperature control module is electrically connected with the flow regulating valves and the temperature sensor, the battery management module is used for supplying power to the temperature control module and receiving a temperature value fed back by the temperature control module, and the temperature control module is used for controlling the opening degree of each flow regulating valve according to the target regulation ratio.
Optionally, the temperature control module includes power strip, communication board, temperature acquisition board, drive plate, main control panel and the memory cell of mutual electricity connection, the power strip is used for receiving from the power that battery management module provided, the communication board is used for with temperature value feedback to battery management module, temperature acquisition board is used for submitting after handling the temperature value the main control panel compares with the operation, the drive plate is used for receiving the regulation ratio data of main control panel is in order to control the aperture of flow control valve, the main control panel is used for carrying out the operation of regulation ratio data and transmitting to the drive plate, the memory cell is used for storing temperature value and regulation ratio data.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
Compared with the prior art, the invention provides a battery pack cooling control method, a battery pack cooling control device and a computer readable storage medium. The cooling channel is used for cooling the battery module to a preset temperature, and the flow regulating valve is used for regulating the flow of the cooling liquid flowing into the cooling channel. The method comprises the steps of obtaining a target regulation ratio of each flow regulating valve; and then controlling the opening of the flow regulating valve corresponding to each battery module according to the target regulating ratio of each flow regulating valve so as to regulate the flow of the cooling liquid flowing into the cooling channel corresponding to each battery module, thereby realizing the independent regulation and control of the flow of the cooling liquid on the cooling channel of each battery module, and being capable of respectively regulating the temperature of each battery module, thereby reducing the temperature difference of each battery module.
Drawings
Fig. 1 is a schematic flow chart of a battery pack cooling control method according to an embodiment of the present invention.
Fig. 2 is a flowchart of another implementation of the battery pack cooling control method according to an embodiment of the present invention.
Fig. 3 is a flowchart of another implementation of the battery pack cooling control method according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a battery pack cooling control device according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a temperature control module according to an embodiment of the present invention.
Reference numerals illustrate: 1. a battery module; 11. a first temperature sensor; 12. a second temperature sensor; 13. a third temperature sensor; 2. a water inlet main pipe; 3. a water outlet main pipe; 4. an inlet fitting; 5. an outlet fitting; 6. a cooling channel; 7. a battery management module; 8. a temperature control module; 81. a power panel; 82. a communication board; 83. a temperature acquisition plate; 84. a driving plate; 85. a main control board; 86. a storage unit; 9. a flow regulating valve.
Detailed Description
The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings. While the invention may be susceptible to further details and specific details of technical means and effects for achieving the desired purpose, the drawings are provided for reference and illustration only and are not intended to be limiting.
Referring to fig. 1 and 4, the present invention provides a battery pack cooling control method, the battery pack including a plurality of battery modules 1, each of the battery modules 1 being provided with a flow rate adjustment valve 9 and a cooling passage 6, the cooling passage 6 being used for cooling the battery modules 1 to a preset temperature, the flow rate adjustment valve 9 being used for adjusting a flow rate of a cooling liquid flowing into the cooling passage 6, comprising the steps of:
s1, acquiring a first temperature value corresponding to each battery module 1 and a first regulation ratio corresponding to each flow regulating valve 9 at a first moment;
s2, acquiring a second temperature value corresponding to each battery module 1 at a second moment, wherein the first moment and the second moment are spaced by a preset time;
s3, calculating a cooling speed according to vb= (Ta-Tb)/Ta/Ka, wherein Vb is the cooling speed of the cooling channel 6 corresponding to each battery module 1 in the preset time, ta is a first temperature value of each battery module 1 at the first moment, tb is a second temperature value of each battery module 1 at the second moment, ta is the preset time, and Ka is a first regulation ratio of the flow regulating valve 9 corresponding to each battery module 1 at the first moment;
s4, calculating cooling time according to tmax= (Tbmax-Ts)/Vmax/Kamax, wherein tmax is cooling time required by the battery module 1 corresponding to the maximum value of the second temperature values to cool to the preset temperature, tbmax is the maximum value of the second temperature values, ts is the preset temperature, vmax is cooling speed of the battery module 1 corresponding to the maximum value of the second temperature values, and Kamax is a first regulation ratio of the flow regulating valve 9 corresponding to the maximum value of the second temperature values;
s5, calculating a target regulation ratio according to Kb= (Tb-Ts)/Vb/tmax multiplied by 100%, wherein Kb is the target regulation ratio of the flow regulating valve 9 corresponding to each battery module 1;
and S6, controlling the opening degree of the flow regulating valve 9 corresponding to each battery module 1 according to the target regulating ratio of each flow regulating valve 9 so as to regulate the flow rate of the cooling liquid flowing into the cooling channel 6 corresponding to each battery module 1.
The control method is applicable to a battery pack consisting of blade batteries, but can also be applied to a battery pack consisting of square aluminum shell batteries or other forms of battery packs by modification; or other equipment requiring cooling. As an example of a battery pack composed of blade batteries, the battery module 1 in the present application is a blade battery.
The regulation ratio is an important parameter of the control method, and is the ratio of the maximum flow rate to the minimum flow rate that can be controlled by the flow rate regulating valve 9, also called as an adjustable ratio. In order to secure the effectiveness of the regulation ratio adjustment operation, when the target regulation ratio is at a maximum value, the amount of heat that can be taken away by the coolant flow needs to be greater than the maximum heat generation amount generated by the battery module 1.
The target turndown ratio is obtained from the temperature of the cell stack. The target regulation of the battery module 1 with lower temperature is smaller, and the flow of the cooling liquid of the cooling channel 6 corresponding to the battery module 1 with smaller target regulation is smaller; the battery module 1 with higher temperature has larger target adjustment ratio, the cooling liquid flow of the cooling channel 6 corresponding to the battery module 1 with larger target adjustment ratio is larger, and the temperature of each battery module 1 is balanced by the flow of the cooling liquid flow.
For convenience of explanation, in the present embodiment, the preset temperature Ts is set to 25 ℃, and the flow rate adjusting valve 9 of the cooling line is reduced in the adjustment ratio after a certain battery module 1 is cooled to the preset temperature, so that the temperature is maintained and energy is saved. In addition, in the present embodiment, the current temperature difference of each BATTERY module 1, the operation state of the cooling device, and the adjustment ratio of each flow rate adjustment valve 9 are transmitted to the BMU (BATTERY MANAGEMENT SYSTEM) through communication, that is, the BATTERY management module 7 of the present application performs integrated control or operation. First, temperature acquisition is performed at a first time. Assuming that four groups of battery modules 1 are provided, the numbers of the battery modules 1 are 1-4, the first temperature Ta acquired at the first moment is 29 ℃, 30 ℃, 35 ℃, 33 ℃, the maximum temperature difference between the battery modules 1 reaches 6 ℃, and the first regulation ratio Ka of all the flow regulating valves 9 is set to be 100% after the temperature acquisition at the first moment. The preset time ta is set to 10s, namely, after 10s from the temperature acquisition at the first moment, the second temperature acquisition is performed at the second moment. It is assumed that the second temperature Tb of the battery modules 1 numbered 1 to 4 at this time is 27.9 deg.c, 29.3 deg.c, 34 deg.c, 31.8 deg.c, and the maximum temperature difference between the battery modules 1 is 6.1 deg.c in sequence. According to the formula vb= (Ta-Tb)/Ta/Ka, the cooling speed of the battery module 1 with the number of 1-4 is calculated to be 0.110 ℃/s, 0.070 ℃/s, 0.100 ℃/s and 0.120 ℃/s in sequence. The battery module 1 with the number of 3 is used for illustration, namely the current liquid inlet temperature and flow rate of the battery pack cooling device are unchanged, the battery running state is unchanged, and the temperature of the battery at 0.100 ℃ can be reduced by a single cooling channel 6 per second; the time tmax= (34-25)/0.100/100% = 90s required for the maximum value Tbmax of the second temperature values to drop to the preset temperature Ts, that is, the maximum temperature of the battery module 1 numbered 3 at the second moment is 34 c at this time and 90s is required for the maximum coolant flow to drop to 25 c, is calculated using the formula tmax= (Tbmax-Ts)/Vmax/Kamax. And continuously calculating the set values Kb of the flow regulation ratio after the collection of the battery module 1 with the number of 1-4 at the second moment according to the formula Kb= (Tb-Ts)/Vb/tmax multiplied by 100%, wherein the set values Kb are 29%, 68%, 100% and 63% respectively. After the second time is acquired, the flow regulating valves 9 are respectively set according to the target regulating ratio, and the temperature difference of each battery module 1 is reduced in the process of being cooled. In the present embodiment, the flow rate adjustment ratio of each flow rate adjustment valve 9 is calculated by tmax because: if the flow rate adjusting valves 9 are all set to 100% by Ka to reduce the temperature, the time taken for the battery module 1 with the highest temperature to reduce to the preset temperature is longest, and the adjustment ratios are set with reference to tmax, so that the battery module 1 with the highest temperature and other battery modules 1 reach the preset temperature at the same time after the time tmax elapses, during the temperature reduction process, the temperature difference is gradually reduced, and when the temperature difference is reduced to 0, the battery modules 1 reach the preset temperature at the same time.
To verify the feasibility of adjusting the flow rate adjustment valve 9 according to the target adjustment ratio in this embodiment, 30s after the adjustment of the flow rate adjustment valve 9 is calculated by the formula tc=tb-vb×kb×tb, where Tc is the temperature value of each battery module 1 after the second time elapses for 30s, and Tc is the interval time after the adjustment of the flow rate adjustment valve 9, after the adjustment of the flow rate adjustment valve 9 is performed, 30s is calculated. The calculated temperatures Tc of the battery modules numbered 1-4 are 26.93 ℃, 27.87 ℃, 31.00 ℃ and 29.53 ℃ respectively, and the maximum temperature difference between the battery modules 1 is 4.1 ℃. It can be seen that the maximum temperature difference between the battery modules 1 at this time has been reduced by 2 deg.c compared to the temperature collected at the second time.
Here, it is assumed that the cooling effect is affected by other factors, and the temperature Tci of the battery module 1 with the number of 1 to 4 is sequentially: the cooling rate Vc of each battery is calculated again at 27.37 ℃, 27.90 ℃, 31.60 ℃ and 29.90 ℃ through the formula Vc= (Tb-Tci)/Tb/Kb, and is as follows in sequence: 0.060 ℃/s, 0.068 ℃/s, 0.080 ℃/s, 0.101 ℃/s, and Vc is changed compared with Vb, which is the result of combining the effects of other factors. The adjustment ratio Kc of the battery module 1 with the number of 1 to 4 is calculated according to the formula tmax= (Tcimax-Ts)/Vc/Kb and kc= (Tci-Ts)/Vc/tmax×100% by assuming the temperature affected by other factors and the temperature decreasing speed affected by the temperature decreasing speed, which are acquired for the third time, in order: 48%, 51%, 100%, 59%.
It was further verified that the flow rate regulating valve 9 calculates the temperature value of each battery module 1 at intervals 30s after 30s regulated according to Kc by the formula td=tc-vc×kc×tc, where Td is the temperature value of each battery module 1 after 30s regulated according to Kc, and Tc is the interval time after 30s regulated by the flow rate regulating valve 9 according to Kc, when the cooling rate is not affected by other factors. The calculated temperatures Td of the battery modules numbered 1 to 4 were 26.51 ℃, 26.85 ℃, 29.20 ℃, 28.12 ℃ respectively, and the maximum temperature difference between the battery modules 1 was 2.7 ℃. It can be seen that the maximum temperature difference between the battery modules 1 at this time has been further reduced by 3.5 deg.c compared to the temperature collected at Tc. Therefore, in this embodiment, the difference is gradually reduced while the temperature of the battery module 1 is reduced, so as to form dynamic equilibrium of temperature, thereby improving the service life of the battery, ensuring the efficiency of charging and discharging the battery, and enhancing the safety of the battery system.
Referring to fig. 2, in a possible embodiment, before the step S1 of obtaining the first temperature value corresponding to each battery module and the first adjustment ratio corresponding to each flow rate adjustment valve at the first moment, the method includes:
s101, acquiring module temperature values of a plurality of battery modules 1, and calculating a module temperature difference value between any two module temperature values;
s102, if at least one module temperature difference value is greater than or equal to a preset maximum temperature difference value, obtaining a target regulation ratio of each flow regulating valve 9.
In this embodiment, the module temperature difference between any two battery modules 1 is calculated, for example, if four groups of battery modules are provided, four module temperature values are obtained, and then six module temperature differences are calculated. However, if at least one module temperature difference value of the six module temperature difference values is greater than or equal to the preset maximum temperature difference value, the problem that the temperature difference between any battery modules 1 is too large is proved, and the service life and the use safety of the battery can be influenced. When the module temperature difference is greater than the preset maximum temperature difference (generally set to 1-3 ℃), the current working state of the battery pack and the real-time temperature of each battery module 1 are combined to adjust the adjusting ratio of the flow adjusting valve 9 corresponding to each battery module 1, so as to adjust the flow of cooling liquid in the cooling channel 6 corresponding to each battery module 1.
Further, if all the module temperature values are greater than the preset minimum temperature value and less than the preset maximum temperature value, the target adjustment ratio of the flow adjustment valve 9 is not required to be adjusted, wherein the preset minimum temperature value and the preset maximum temperature value are respectively the lower limit value and the upper limit value of the temperature of the normal operation of the battery module 1, and can be designed according to the performance of the battery module 1. But the temperatures of all the battery modules 1 are within the allowable range and do not need to be regulated by the flow regulating valve 9. If the flow regulating valve 9 is adopted to regulate to reduce the temperature difference, on one hand, the effect may be poor, the temperature difference cannot be quickly reduced to the allowable range, and on the other hand, the temperature value of the module originally in the allowable range may be caused to exceed the normal range in the cooling process.
Referring to fig. 3, in one possible embodiment, the step S6 of controlling the opening of the flow rate adjustment valve 9 corresponding to each battery module 1 according to the target adjustment ratio of each flow rate adjustment valve 9 to adjust the flow rate of the coolant flowing into the cooling channel 6 corresponding to each battery module 1 includes:
and S7, cooling the battery module 1 to the preset temperature, and reducing the target regulation ratio to a second regulation ratio, wherein the second regulation ratio is used for maintaining the battery module 1 at the preset temperature.
In the present embodiment, after a certain battery module 1 is cooled to the preset temperature, the flow rate adjusting valve 9 of the cooling passage 6 is lowered to the second adjusting ratio, and the temperature is maintained and energy is saved. When the flow rate regulating valve 9 is to be lowered to the second regulation ratio, the amount of heat that can be taken away by the flow rate of the coolant needs to be just equal to the amount of heat generated by the battery module 1. The second regulation ratio may be designed according to the performance of the battery module 1.
Referring to fig. 4, the present invention further provides a battery pack cooling control device, configured to implement any one of the above battery pack cooling control methods, including a water inlet main pipe 2, a water outlet main pipe 3, an inlet joint 4, and an outlet joint 5; the plurality of cooling channels 6 are arranged side by side, one end of each cooling channel 6 is communicated with the water inlet main pipe 2, and the other end of each cooling channel 6 is communicated with the water outlet main pipe 3; the water inlet main pipe 2 is provided with an inlet joint 4; the main water outlet pipe 3 is provided with an outlet joint 5.
Taking the battery module 1 as a blade battery as an example. The battery pack cooling device is positioned on the blade battery in the battery pack, and then the battery pack is packaged. The inlet joint 4 and the outlet joint 5 are exposed out of the battery pack, low-temperature cooling liquid enters the water inlet main pipe 2 through the inlet joint, the water inlet main pipe 2 is connected to the cooling channels 6 through a certain number of flow regulating valves 9, the number of the flow regulating valves 9 is the same as that of the cooling channels 6, the number of the cooling channels 6 is the same as that of the blade batteries in the battery pack, the lower surfaces of the cooling channels 6 are tightly attached to the upper surfaces of the corresponding blade batteries, heat exchange and heat dissipation are carried out on the blade batteries, the tail ends of the cooling channels 6 are connected with the water outlet main pipe 3, and high-temperature cooling liquid flows out of the battery pack through the outlet joint 5 after converging.
The cooling control device in the present application operates as follows: the cooling liquid flows into the water inlet main pipe 2 from the inlet joint 4, flows into the corresponding cooling channels 6 through the flow regulating valves 9, exchanges heat for the batteries respectively through contact, and flows out of the battery pack through the liquid cooling pipe outlet joint 5 after heat exchange by converging on the water outlet main pipe 3. The temperature of each battery module 1 is collected by a temperature collection wire harness and a temperature sensor and then is supplied to a temperature control module 8. Through calculation, different signals are output to each flow regulating valve 9, and the flow of the cooling liquid to each battery module 1 is controlled, so that the temperature difference of each battery is reduced, and dynamic temperature balance is maintained.
Referring to fig. 4, in one possible embodiment, a plurality of temperature sensors are included, and each of the battery modules 1 is provided at one end thereof adjacent to the water outlet main pipe 3, and the temperature sensors are used to obtain the temperature value of the battery module 1. As the temperature sensor in the present embodiment, there is an integrated temperature sensor capable of detecting different positions in the prior art. Such a temperature sensor may be selected, or a temperature sensor having a plurality of temperature probes for detecting real-time temperature values of the respective battery modules 1 may be selected. Preferably, a patch type temperature sensor is employed. The temperature control module 8 also draws out a temperature acquisition wire harness and a flow regulating valve 9 to control the wire harness, and the tail end of the temperature acquisition wire harness is connected with a temperature sensor. Taking blade batteries and a patch type temperature sensor as an example, the patch type temperature sensor is respectively stuck and installed on the end face of each blade battery close to the water outlet main pipe 3.
Further, a patch type temperature sensor, defined as a first temperature sensor 11, may be provided between adjacent two batteries among the plurality of blade batteries; a patch type temperature sensor, defined as a second temperature sensor 12, is provided in the middle of the outermost blade cell among the plurality of blade cells. The surface-mounted temperature sensor is defined as a third sensor. The third sensor is used to detect the temperature of the individual blade cells and the first 11 and second 12 temperature sensors are used to calibrate the health of the end-face mounted sensors. The calibration method is to compare the temperature values of the first temperature sensor 11, the second temperature sensor 12 and the third temperature sensor 13. The temperature value of the third temperature sensor 13 in the normal state is slightly higher. If the temperature value of the third temperature sensor 13 is higher than the temperature value of the first temperature sensor 11 or the second temperature sensor 12 at a certain time and the difference value exceeds the set threshold value, or the temperature value of the first temperature sensor 11 or the second temperature sensor 12 is higher than the temperature value of the third temperature sensor 13 and the difference value exceeds the set threshold value, the temperature sensor is indicated to have a fault and the normal operation of the cooling device is affected, the temperature control module 8 alarms the communication BMU.
Referring to fig. 5, in one possible embodiment, the battery management module 7 and the temperature control module 8 are included, the battery management module 7 is electrically connected with the temperature control module 8, the temperature control module 8 is electrically connected with the flow rate adjusting valves 9 and the temperature sensors, the battery management module 7 is used for supplying power to the temperature control module 8 and receiving temperature values fed back by the temperature control module 8, and the temperature control module 8 is used for controlling the opening degree of each flow rate adjusting valve 9 according to a target adjustment ratio.
Specifically, the temperature control module 8 includes a power panel 81, a communication panel 82, a temperature acquisition panel 83, a driving panel 84, a main control panel 85 and a storage unit 86 that are electrically connected to each other, the power panel 81 is used for receiving a power supply provided from the battery management module 7, the communication panel 82 is used for feeding back a temperature value to the battery management module 7, the temperature acquisition panel 83 is used for processing the temperature value and submitting the processed temperature value to the main control panel 85 for operation comparison, the driving panel 84 is used for receiving adjustment ratio data of the main control panel 85 to control the opening of the flow control valve 9, the main control panel 85 is used for performing operation of the adjustment ratio data and transmitting the adjustment ratio data to the driving panel 84, and the storage unit 86 is used for storing the temperature value and the adjustment ratio data.
The components of the temperature control module 8 are described in detail below. The temperature control module 8 is installed in the battery pack, and is connected with the battery management module 7 through a power supply wire harness and a communication wire harness, the battery management module 7 supplies power for the temperature control module, and the control state and the alarm information are regulated and transmitted to the battery management module 7 through the communication wire harness to perform corresponding actions. In addition, the temperature control module 8 also draws out a temperature acquisition wire harness and a flow control valve 9 control wire harness, the tail end of the temperature acquisition wire harness is connected with a patch type temperature sensor, the flow control valve 9 control wire harness is connected with the flow control valve 9, and the flow control ratio issued by the temperature control module 8 controls the opening of the corresponding flow control valve 9, so as to control the flow of cooling liquid in the corresponding cooling channel 6. The temperature control module 8 includes a power panel 81, a communication panel 82, a temperature acquisition panel 83, a driving panel 84, a main control panel 85, and a storage unit 86. Wherein the power board 81 receives power supplied from the battery management module 7 and converts the power into power required by each element in the temperature control module 8; the communication board 82 transmits the regulation control state and alarm information of the temperature control module 8 to the battery management module 7 through a communication wire harness; the temperature acquisition board 83 is connected with a temperature acquisition wire harness, and the temperature data transmitted by the surface mounted temperature sensor on the blade battery are processed and then submitted to the main control board 85 for calculation and comparison; the driving board 84 is used for receiving the flow regulation ratio data of the main control board 85, converting the flow regulation ratio data into corresponding signals and giving the corresponding signals to the flow regulation valve 9 for flow control; the main control board 85 performs data operation, comparison and transmission based on the MCU (Microcontroller Unit micro control unit); the storage unit 86 is for storing data of temperature collection, data of operation comparison result, data issued to the drive plate 84 of the flow rate regulating valve 9, and the like.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
Compared with the prior art, the temperature of each battery is acquired through the temperature acquisition wire harness and the temperature sensor and then is supplied to the temperature control module 8, different signals are output to each flow regulating valve 9 through operation, the flow of cooling liquid for cooling and heat exchanging each battery is controlled, the temperature difference of each battery module 1 is reduced, and dynamic temperature balance is maintained.
The present invention is not limited to the above embodiments, but is capable of modification and variation in all aspects, including the following description, but not limited to, embodiments, and various modifications and adaptations of the invention as come within the true spirit and scope of the invention.
Claims (8)
1. The battery pack comprises a plurality of battery modules, each battery module is correspondingly provided with a flow regulating valve and a cooling channel, the cooling channel is used for cooling the battery modules to a preset temperature, and the flow regulating valve is used for regulating the flow of cooling liquid flowing into the cooling channel, and the battery pack is characterized by comprising the following steps:
acquiring a first temperature value corresponding to each battery module and a first regulation ratio corresponding to each flow regulating valve at a first moment;
acquiring a second temperature value corresponding to each battery module at a second moment, wherein the first moment and the second moment are spaced by a preset time;
calculating a cooling speed according to vb= (Ta-Tb)/Ta/Ka, wherein Vb is the cooling speed of a cooling channel corresponding to each battery module in the preset time, ta is a first temperature value of each battery module at the first moment, tb is a second temperature value of each battery module at the second moment, ta is the preset time, and Ka is a first regulation ratio of a flow regulating valve corresponding to each battery module at the first moment;
calculating cooling time according to tmax= (Tbmax-Ts)/Vmax/Kamax, wherein tmax is cooling time required by cooling the battery module corresponding to the maximum value of the plurality of second temperature values to the preset temperature, tbmax is the maximum value of the plurality of second temperature values, ts is the preset temperature, vmax is cooling speed of the battery module corresponding to the maximum value of the plurality of second temperature values, and Kamax is a first regulation ratio of the flow regulating valve corresponding to the maximum value of the plurality of second temperature values;
calculating a target regulation ratio according to Kb= (Tb-Ts)/Vb/tmax multiplied by 100%, wherein Kb is the target regulation ratio of the flow regulating valve corresponding to each battery module;
and controlling the opening degree of the flow regulating valve corresponding to each battery module according to the target regulating ratio of each flow regulating valve so as to regulate the flow of the cooling liquid flowing into the cooling channel corresponding to each battery module.
2. The battery pack cooling control method according to claim 1, wherein the step of acquiring the first temperature value corresponding to each battery module and the first regulation ratio corresponding to each flow rate regulating valve at the first time includes:
obtaining module temperature values of a plurality of battery modules, and calculating a module temperature difference value between any two module temperature values;
and if the temperature difference value of at least one module is greater than or equal to the preset maximum temperature difference value, acquiring the target regulation ratio of each flow regulating valve.
3. The battery pack cooling control method according to claim 1, wherein the step of controlling the opening degree of the flow rate adjustment valve corresponding to each of the battery modules according to the target adjustment ratio of each of the flow rate adjustment valves to adjust the flow rate of the coolant flowing into the cooling passage corresponding to each of the battery modules, after the step of:
and cooling the battery module to the preset temperature, and reducing the target regulation ratio to a second regulation ratio, wherein the second regulation ratio is used for maintaining the battery module at the preset temperature.
4. A battery pack cooling control device for realizing the battery pack cooling control method according to any one of claims 1 to 3, characterized by comprising a water inlet main pipe, a water outlet main pipe, an inlet joint and an outlet joint; the cooling channels are arranged side by side, one end of each cooling channel is communicated with the water inlet main pipe, and the other end of each cooling channel is communicated with the water outlet main pipe; the water inlet main pipe is provided with the inlet joint; the water outlet main pipe is provided with the outlet joint.
5. The battery pack cooling control device according to claim 4, comprising a plurality of temperature sensors, wherein each of the battery modules is provided with the temperature sensor at an end thereof close to the water outlet main pipe, and the temperature sensor is used for acquiring a temperature value of the battery module.
6. The battery pack cooling control device according to claim 5, comprising a battery management module and a temperature control module, wherein the battery management module is electrically connected with the temperature control module, the temperature control module is electrically connected with the flow regulating valves and the temperature sensors, the battery management module is used for supplying power to the temperature control module and receiving temperature values fed back by the temperature control module, and the temperature control module is used for controlling the opening degree of each flow regulating valve according to the target regulation ratio.
7. The battery pack cooling control device according to claim 6, wherein the temperature control module comprises a power panel, a communication panel, a temperature acquisition panel, a driving panel, a main control panel and a storage unit, which are electrically connected with each other, wherein the power panel is used for receiving power supplied from the battery management module, the communication panel is used for feeding back a temperature value to the battery management module, the temperature acquisition panel is used for submitting the processed temperature value to the main control panel for operation comparison, the driving panel is used for receiving regulation ratio data of the main control panel to control the opening degree of the flow regulating valve, the main control panel is used for performing operation of the regulation ratio data and transmitting the regulation ratio data to the driving panel, and the storage unit is used for storing the temperature value and the regulation ratio data.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 3.
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