CN117638316A - Quick charge cooling method, control system, equipment and medium for lithium ion power battery - Google Patents
Quick charge cooling method, control system, equipment and medium for lithium ion power battery Download PDFInfo
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Abstract
The invention provides a rapid charging and cooling method, a control system, equipment and a medium for a lithium ion power battery, wherein the cooling method is a preset interval for setting a first electric quantity; obtaining a first target electric quantity by adding a preset interval of the first electric quantity to the first current electric quantity, and obtaining a first temperature; obtaining a corresponding first ideal temperature under the first target electric quantity according to the ideal temperature rise curve; judging a first ideal temperature and a first temperature, and when the first temperature is higher than the first ideal temperature, sending a cooling start command to drive a cooling system to start; the application only opens cooling system when first temperature is greater than first ideal temperature, has avoided the waste of energy, and this application is the prediction to the first temperature under the first target electric quantity in future, compares the first temperature that predicts with first ideal temperature, has avoided the conduction time of actual detection temperature, begins cooling system in advance, avoids cooling system to carry out the reaction time of instruction, has solved the problem of temperature control hysteresis.
Description
Technical Field
The application relates to the technical field of lithium ion power battery thermal management, in particular to a quick charge cooling method, a control system, equipment and a medium for a lithium ion power battery.
Background
Along with development of science and technology, electric automobile walks into people's field of vision gradually, and under the general circumstances, electric automobile's battery system adopts lithium ion battery, and lithium ion battery can produce heat at high temperature fast charge in-process, when the heat is too high, can cause battery system's damage.
In the prior art, in order to avoid overheat of the battery system during the charging process of the battery system, the battery system is generally cooled by a cooling system during the whole charging process, which causes unnecessary waste and may affect the charging speed of the battery.
Disclosure of Invention
In view of the foregoing drawbacks and deficiencies of the prior art, the present application is directed to a method, control system, apparatus and medium for fast charge cooling of a lithium-ion power battery.
In a first aspect, the present application provides a method for rapidly cooling a lithium ion power battery, including the steps of:
acquiring a first current electric quantity of a battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
setting a first preset electric quantity difference value, and obtaining a first target electric quantity which is the sum of the first current electric quantity and the first preset electric quantity difference value;
obtaining a first temperature according to the first current electric quantity and the first target electric quantity, wherein the first temperature is the temperature when the residual electric quantity of the battery system is the first target electric quantity;
obtaining a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, wherein the ideal temperature rise curve represents the maximum temperature of the battery system in a certain residual electric quantity;
and when the first temperature is judged to be greater than the first ideal temperature, generating a cooling start instruction, wherein the cooling start instruction is used for driving a cooling system to start.
According to the technical scheme provided by the embodiment of the application, the first temperature is obtained according to the first current electric quantity and the first target electric quantity, and the method comprises the following steps:
acquiring a first initial battery cell temperature corresponding to the first current electric quantity;
acquiring a first battery heat generation amount charged from the first current electric quantity to the first target electric quantity;
acquiring a first environment heat exchange amount charged from the first current electric quantity to the first target electric quantity;
and calculating the first temperature based on the first initial cell temperature, the first battery heat generation amount and the first environment heat exchange amount.
According to the technical scheme provided by the embodiment of the application, the method for obtaining the first battery heat generation amount from the first current electric quantity to the first target electric quantity comprises the following steps:
dividing the first preset electric quantity difference value into a plurality of first electric quantity intervals, wherein the maximum charging currents corresponding to different residual electric quantities in the first electric quantity intervals are the same;
obtaining a first interval time of each first electric quantity interval according to a maximum charging current time curve, wherein the maximum charging current time curve represents the relation between the time required by charging each first electric quantity interval and the maximum charging current;
and calculating the battery heat generation quantity of each first electric quantity interval based on the maximum charging current in each first electric quantity interval and the first interval time corresponding to the maximum charging current, and accumulating to obtain the first battery heat generation quantity.
According to the technical scheme provided by the embodiment of the application, the method for obtaining the first environmental heat exchange amount from the first current electric quantity to the first target electric quantity includes the following steps:
acquiring a first ambient temperature of the first current electric quantity;
and calculating the first environment heat exchange amount based on the first interval time, the first initial cell temperature and the first environment temperature.
According to the technical scheme provided by the embodiment of the application, the method for acquiring the ideal temperature rise curve comprises the following steps:
obtaining a maximum bearing temperature function, wherein the maximum bearing temperature function is used for representing the maximum bearing temperature of the battery system at the initial charging moment;
acquiring a battery heat generation function, wherein the battery heat generation function is used for representing the heat generation amount of the battery system in the charging process;
acquiring an environmental heat exchange function, wherein the environmental heat exchange function is used for representing the heat exchange between the battery system and the environment in the charging process;
and constructing and obtaining the ideal temperature rise curve based on the maximum bearing temperature function, the battery heat generation capacity function and the environment heat exchange capacity function.
According to the technical scheme provided by the embodiment of the application, the method for obtaining the maximum bearing temperature function comprises the following steps:
acquiring the temperature of the battery system after charging as a second temperature, wherein the second temperature is related to the residual electric quantity of the battery system after charging;
acquiring a temperature rise function, wherein the temperature rise function is used for representing the maximum temperature rise condition of the battery system after being charged at the initial charging moment;
and constructing and obtaining the maximum bearing temperature function based on the second temperature and the temperature rise function.
According to the technical scheme provided by the embodiment of the application, the temperature rise function acquisition method comprises the following steps:
obtaining a maximum charging current time function according to the maximum charging current time curve;
and constructing and obtaining the temperature rise function according to the maximum charging current time function.
In a second aspect, the present application provides a control system for a rapid charging and cooling method of a lithium ion power battery, including:
the first acquisition module is configured to acquire a first current electric quantity of the battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
the first calculation module is configured to set a first preset electric quantity difference value and obtain a first target electric quantity, and the first target electric quantity is the residual electric quantity of the battery system after the first preset electric quantity difference value is charged by the first current electric quantity;
the second acquisition module is configured to obtain a first temperature according to the first target electric quantity;
the third acquisition module is configured to obtain a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, and the ideal temperature rise curve represents the maximum temperature of the battery system in a certain residual electric quantity;
and the generation module is configured to generate a cooling start instruction when the first temperature is judged to be greater than the first ideal temperature, wherein the cooling start instruction is used for driving a cooling system to start.
In a third aspect, the present application provides a terminal device, including a processor and a memory, wherein the memory stores a computer program, which when executed by the processor, causes the processor to perform the steps of the above-described rapid cooling method for a lithium ion power battery.
In a fourth aspect, the present application provides a readable storage medium having stored thereon a program or instructions that when executed by a processor implement a lithium ion power battery fast charge cooling method as described above.
In summary, the present application proposes a fast charge cooling method for a lithium ion power battery, which obtains a first temperature corresponding to a first target electric quantity, and a difference value of a first current electric quantity and a first preset electric quantity is the first target electric quantity; obtaining a first ideal temperature corresponding to the first target electric quantity according to the temperature rise curve, judging the first temperature and the first ideal temperature, and generating a cooling start instruction for driving a cooling system to start and cooling the battery system when the first temperature is greater than the first ideal temperature; compared with the prior art, the application only starts the cooling system when the first temperature is greater than the first ideal temperature, so that the energy waste is avoided, in addition, the application predicts the first temperature under the first target electric quantity in the future, compares the predicted first temperature with the first ideal temperature, avoids the conduction time of the actual detection temperature, starts the cooling system in advance, avoids the reaction time of the cooling system executing instructions, solves the problem of temperature control hysteresis, reduces the risk of over-temperature limiting current caused by the excessively high temperature rise of the battery system, and prevents the slow charging speed.
Drawings
Fig. 1 is a flowchart of a method for rapidly cooling a lithium ion power battery according to an embodiment of the present invention;
FIG. 2 is a graph showing a maximum charging current time curve;
FIG. 3 is a schematic diagram of an ideal temperature rise curve provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a terminal device provided in embodiment 3 of the present application.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As mentioned in the background art, the application provides a rapid charging and cooling method for a lithium ion power battery, which comprises the following steps:
s100, acquiring a first current electric quantity of a battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
the battery system of the electric automobile CAN be damaged when running at a high temperature, the battery system is required to be cooled by a cooling system, the scheme CAN be executed through a whole automobile controller (Vehicle control unit, VCU), it CAN be understood that the whole automobile controller CAN be connected with each part of the automobile in a communication cable or wireless mode or connected with a CAN (Controller Area Network ) bus of the automobile, and based on the connection, the control of each part of the automobile and the acquisition of the running state information of each part CAN be realized. And sending a cooling start command to the cooling system through the VCU to drive the cooling system to cool the battery pack.
S200, setting a first preset electric quantity difference value, and obtaining a first target electric quantity which is the sum of the first current electric quantity and the first preset electric quantity difference value;
the first preset electric quantity difference value is an artificially set electric quantity change value, and optionally, the first preset electric quantity difference value can be 5%, can be 10%, can also be other numerical values, and can be reasonably set according to the attribute of the battery and the charging requirement;
s300, obtaining a first temperature according to the first current electric quantity and the first target electric quantity, wherein the first temperature is the temperature when the residual electric quantity of the battery system is the first target electric quantity;
the first target electric quantity is a residual electric quantity value which is not reached at the current moment, the first target electric quantity is a planned value obtained by adding the first preset electric quantity difference value, and the first temperature is a temperature corresponding to the first target electric quantity and is a predicted value;
specifically, under the condition that the battery system is continuously charged, the first current electric quantity and the first target electric quantity are continuously increased.
In a preferred embodiment, the obtaining the first temperature according to the first current electric quantity and the first target electric quantity includes the following steps:
s310, acquiring a first initial battery cell temperature corresponding to the first current electric quantity;
the first initial battery cell temperature is the temperature of the battery system battery cell, and can be obtained by measuring a temperature measuring instrument;
s320, obtaining a first battery heat generation amount charged from the first current electric quantity to the first target electric quantity; the method comprises the following steps:
s321, dividing the first preset electric quantity difference value into a plurality of first electric quantity intervals, wherein the maximum charging currents corresponding to different residual electric quantities in the first electric quantity intervals are the same;
when the battery system leaves the factory, a residual electric quantity-power-temperature curve chart is attached, and according to the curve, the maximum charging current corresponding to each electric quantity interval can be calculated, as shown in a table-1:
TABLE-1
| Electric quantity interval | [0％,10％) | [10％,20％) | [20％,30％) | [30％,40％) | …… | [90％,100％) |
| I max | I 1 | I 2 | I 3 | I 4 | …… | I 10 |
Wherein I is max Dividing the first preset electric quantity difference value into a plurality of first electric quantity intervals according to a table-1 for the maximum charging current corresponding to each electric quantity interval; optionally, the first current electric quantity is 10%, and the first target electric quantity is 30%, and two first electric quantity intervals [10%, 20%) and [20%, 30%) are obtained after dividing the first preset electric quantity difference;
s322, obtaining a first interval time of each first electric quantity interval according to a maximum charging current time curve, wherein the maximum charging current time curve represents the relation between the time required by charging each first electric quantity interval and the maximum charging current;
the maximum charging current time curve is shown in fig. 2, the abscissa of the maximum charging current time curve is time, the unit is s, the ordinate is the maximum charging current, and the unit is A; the difference of the remaining power of each first power interval divided by the maximum charging current is the first interval time of each first power interval, as shown in table-1, [10%,20% ] corresponding to the maximum charging current is I 2 The first interval is 10% of battery capacity divided by I 2 The corresponding maximum charging current of [20%, 30%) is I 3 The first interval is 10% of battery capacity divided by I 3 The method comprises the steps of carrying out a first treatment on the surface of the Thus, the maximum charge current time profile can be obtained according to the table-1 arrangement, as shown in fig. 2.
And S323, calculating the battery heat generation quantity of each first electric quantity interval based on the maximum charging current in each first electric quantity interval and the first interval time corresponding to the maximum charging current, and accumulating to obtain the first battery heat generation quantity.
The calculation formula of the heat generation amount of the battery is as follows:
Q 1 ＝I max 2 rΔt formula (1)
Wherein Q is 1 Representing the heat generation capacity of the battery, I max Representing a maximum charging current in the first electric quantity interval; r represents the internal resistance of the battery system, and the resistance of the resistance system is required to be adjusted according to the health state of the battery system; and delta t represents a first interval time, and the first charging current and the first interval time are substituted into the battery heat generation amount obtained in the formula (1) to be added to obtain the first battery heat generation amount.
S330, acquiring a first environment heat exchange amount charged from the first current electric quantity to the first target electric quantity; the method comprises the following steps:
s331, acquiring a first ambient temperature of the first current electric quantity; the first ambient temperature is the ambient temperature of the battery system when the battery system is charged and can be obtained by measurement of a temperature measuring instrument;
and S232, calculating the first environment heat exchange amount based on the first interval time, the first initial cell temperature and the first environment temperature.
The formula of the environmental heat exchange amount is as follows:
Q 2 ＝hA(T 0 -T e ) Deltat formula (2)
Wherein Q is 2 For the heat exchange quantity of the environment, h is the heat exchange coefficient of the battery system and the environment, A represents the outline area of the battery system, and T e Represents a first ambient temperature, T 0 Representing a first initial cell temperature; substituting the first interval time, the first initial cell temperature and the first ambient temperature into a formula (2) to obtain the ambient heat exchange amount of each first interval time, and adding the ambient heat exchange amounts to obtain the first ambient heat exchange amount.
S340, calculating the first temperature based on the first initial cell temperature, the first battery heat generation amount and the first environment heat exchange amount;
wherein, the first temperature calculation formula is as follows:
wherein T is 2 C is the specific heat capacity of the battery system, and m is the mass of the battery system;
s400, obtaining a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, wherein the ideal temperature rise curve is used for representing the maximum temperature of the battery system in a certain residual electric quantity;
the method comprises the following steps:
s410, acquiring a maximum bearing temperature function, wherein the maximum bearing temperature function is used for representing the maximum bearing temperature of the battery system at the initial charging moment; the method comprises the following steps:
s411, acquiring the temperature of the battery system after charging, wherein the temperature is a second temperature, and the second temperature is related to the residual electric quantity of the battery system after charging; the second temperature is obtained by inquiring a residual electric quantity-power-temperature curve attached when the battery system leaves a factory;
s412, acquiring a temperature rise function, wherein the temperature rise function is used for representing the maximum temperature rise condition of the battery system after being charged by the initial charging moment; the method comprises the following steps:
s4121, obtaining a maximum charging current time function according to the maximum charging current time curve;
similarly, according to factory setting of the battery system, the charging process of the whole battery system is divided into a plurality of second electric quantity intervals, the maximum charging current of each second electric quantity interval is the same, the time required for charging in each second electric quantity interval can be obtained according to the maximum and minimum residual electric quantity and the maximum charging current of each second electric quantity interval, and the time is a second interval time, so that the maximum charging current and the second interval time corresponding to each second electric quantity interval can be obtained, and the maximum charging current time function can be obtained;
s4122, constructing and obtaining the temperature rise function according to the maximum charging current time function;
the calculation formula of the temperature rise function is as follows:
wherein Δt represents the temperature rise; Δt (delta t) 1 Representing a charging duration; i (t) represents the maximum charging current time function.
S413, constructing and obtaining the maximum bearing temperature function based on the second temperature and the temperature rise function;
the formula of the maximum bearing temperature is as follows:
T start ＝T 1 (soc) -DeltaT equation (5)
Wherein Tstart represents the maximum bearing temperature, T 1 (soc) is the second temperature.
S420, acquiring a battery heat generation function, wherein the battery heat generation function is used for representing heat generation of the battery system in a charging process; the battery heat generation function Q is as follows:
Q＝I 2 (t)RΔt 1 formula (6)
S430, acquiring an environment heat exchange quantity function, wherein the environment heat exchange quantity function is used for representing heat exchange between the battery system and the environment in a charging process; the environmental heat exchange quantity function Q e The following is shown:
Q e ＝hA(T(soc)-T e (soc))Δt 1 formula (7)
Wherein T (soc) represents the initial temperature of the battery system at the initial charge time, T e (soc) represents an ambient temperature at an initial charging time, said initial temperature and said ambient temperature being obtainable by means of a temperature measuring instrument.
S450, constructing and obtaining the ideal temperature rise curve based on the maximum bearing temperature function, the battery heat generation capacity function and the environment heat exchange capacity function;
the calculation formula of the ideal temperature rise function is as follows:
wherein T is N And representing ideal temperatures corresponding to different residual electric quantities, and obtaining an ideal temperature rise curve according to the maximum bearing temperature function, the battery heat generation capacity function and the environment heat exchange capacity function, as shown in fig. 3.
S500, when the first temperature is judged to be greater than the first ideal temperature, generating a cooling start instruction, wherein the cooling start instruction is used for driving a cooling system to start; under certain specific scenes, when the first current electric quantity is 10% and the first target electric quantity is 30%, the first temperature is 30 ℃ according to the steps, and the first ideal temperature corresponding to the first target electric quantity is 25 ℃ according to an ideal temperature rise curve, so that the first temperature is greater than the first ideal temperature, and the cooling system is started.
To sum up, compared with the prior art, the application only opens cooling system when first temperature is greater than first ideal temperature, avoid the extravagant of energy, in addition, this application is the prediction to the first temperature under the first target electric quantity in future, compare the first temperature that predicts with first ideal temperature, the conduction time of having avoided actual detection temperature, begin cooling system in advance, avoid cooling system to carry out the reaction time of instruction, the problem of temperature control hysteresis has been solved, reduce battery system's temperature rise too fast and lead to the risk of overtemperature limiting current, prevent charge speed to become slow.
Example 2
On the basis of embodiment 1, the present application provides a control system of a rapid charging and cooling method for a lithium ion power battery, comprising:
the first acquisition module is configured to acquire a first current electric quantity of the battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
the first calculation module is configured to set a first preset electric quantity difference value and obtain a first target electric quantity, and the first target electric quantity is the residual electric quantity of the battery system after the first preset electric quantity difference value is charged by the first current electric quantity;
the second acquisition module is configured to obtain a first temperature according to the first target electric quantity;
the third acquisition module is configured to obtain a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, and the ideal temperature rise curve represents the maximum temperature of the battery system in a certain residual electric quantity;
and the generation module is configured to generate a cooling start instruction when the first temperature is judged to be greater than the first ideal temperature, wherein the cooling start instruction is used for driving a cooling system to start.
The method comprises the steps of setting a preset interval of a first electric quantity; adding a preset interval of the first electric quantity to the first current electric quantity to obtain a first target electric quantity, and obtaining a first temperature; obtaining a corresponding first ideal temperature under the first target electric quantity according to the ideal temperature rise curve; judging a first ideal temperature and a first temperature, and when the first temperature is higher than the first ideal temperature, sending a cooling start command to drive a cooling system to start; compared with the prior art, the application only starts the cooling system when the first temperature is greater than the first ideal temperature, so that the energy waste is avoided, in addition, the application predicts the first temperature under the first target electric quantity in the future, compares the predicted first temperature with the first ideal temperature, avoids the conduction time of the actual detection temperature, starts the cooling system in advance, avoids the reaction time of the cooling system executing instructions, solves the problem of temperature control hysteresis, reduces the risk of over-temperature limiting current caused by the excessively high temperature rise of the battery system, and prevents the slow charging speed. The system provided by the embodiment of the application can realize each process realized by the embodiment of the method, has the corresponding functional module and beneficial effect, and is not repeated here.
Example 3
The embodiment provides a terminal device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the steps of the rapid charging and cooling method of the lithium ion power battery according to any one of the above items when executing the computer program. Fig. 4 is a schematic structural diagram of an apparatus provided in embodiment 3 of the present application. As shown in fig. 4, the terminal device 300 is, for example, a computer, and the computer system includes a Central Processing Unit (CPU) 301 that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 302 or a program loaded from a storage section into a Random Access Memory (RAM) 303. In the RAM303, various programs and data required for the system operation are also stored. The CPU301, ROM302, and RAM303 are connected to each other through a bus 304. An input/output (I/O) interface 305 is also connected to bus 304.
The following components are connected to the I/O interface 305: an input section 306 including a keyboard, a mouse, and the like; an output section including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage section 308 including a hard disk or the like; and a communication section 309 including a network interface card such as a LAN card, a modem, or the like. The communication section 309 performs communication processing via a network such as the internet. The drives are also connected to the I/O interface 305 as needed. A removable medium 311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is installed on the drive 310 as needed, so that a computer program read therefrom is installed into the storage section 308 as needed.
In particular, according to an embodiment of the present invention, the process of the lithium-ion power battery rapid charge cooling method described in the above embodiment may be implemented as a computer software program. For example, an embodiment of the invention includes a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flow chart. In such embodiments, the computer program may be downloaded and installed from a network via a communication portion, and/or installed from a removable medium. The above-described functions defined in the apparatus of the present application are performed when the computer program is executed by a Central Processing Unit (CPU) 301.
The computer readable medium shown in the present invention may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units involved in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases. The described units or modules may also be provided in a processor, for example, as: the processor comprises a first generation module, an acquisition module, a search module, a second generation module and a combination module. The names of these units or modules do not in any way limit the unit or module itself, and the input module may also be described as "an acquisition module for acquiring a plurality of instances to be probed in the base table", for example.
As another aspect, the present application also provides a computer-readable medium that may be contained in the terminal device described in the above embodiment; or may exist alone without being fitted into the terminal device. The computer readable medium carries one or more programs which, when executed by one of the terminal devices, cause the terminal device to implement the rapid charge cooling method for lithium ion power batteries as described in the above embodiments.
It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Furthermore, although the steps of the methods in the present disclosure are depicted in a particular order in the drawings, this does not require or imply that the steps must be performed in that particular order or that all illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. The quick charge cooling method for the lithium ion power battery is characterized by comprising the following steps of:
acquiring a first current electric quantity of a battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
setting a first preset electric quantity difference value, and obtaining a first target electric quantity which is the sum of the first current electric quantity and the first preset electric quantity difference value;
obtaining a first temperature according to the first current electric quantity and the first target electric quantity, wherein the first temperature is the temperature when the residual electric quantity of the battery system is the first target electric quantity;
obtaining a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, wherein the ideal temperature rise curve is used for representing the maximum temperature of the battery system in a certain residual electric quantity;
and when the first temperature is judged to be greater than the first ideal temperature, generating a cooling start instruction, wherein the cooling start instruction is used for driving a cooling system to start.
2. The method of claim 1, wherein the obtaining a first temperature from the first current power level and the first target power level comprises the steps of:
acquiring a first initial battery cell temperature corresponding to the first current electric quantity;
acquiring a first battery heat generation amount charged from the first current electric quantity to the first target electric quantity;
acquiring a first environment heat exchange amount charged from the first current electric quantity to the first target electric quantity;
and calculating the first temperature based on the first initial cell temperature, the first battery heat generation amount and the first environment heat exchange amount.
3. The method of claim 2, wherein the step of obtaining the first battery heat generation amount charged from the first current amount of electricity to the first target amount of electricity comprises the steps of:
dividing the first preset electric quantity difference value into a plurality of first electric quantity intervals, wherein the maximum charging currents corresponding to different residual electric quantities in the first electric quantity intervals are the same;
obtaining a first interval time of each first electric quantity interval according to a maximum charging current time curve, wherein the maximum charging current time curve represents the relation between the time required by charging each first electric quantity interval and the maximum charging current;
and calculating the battery heat generation quantity of each first electric quantity interval based on the maximum charging current in each first electric quantity interval and the first interval time corresponding to the maximum charging current, and accumulating to obtain the first battery heat generation quantity.
4. The method of claim 3, wherein the step of obtaining a first ambient heat exchange amount from the first current amount of electricity to the first target amount of electricity comprises the steps of:
acquiring a first ambient temperature of the first current electric quantity;
and calculating the first environment heat exchange amount based on the first interval time, the first initial cell temperature and the first environment temperature.
5. The method of claim 1, wherein obtaining the ideal temperature rise profile comprises the steps of:
obtaining a maximum bearing temperature function, wherein the maximum bearing temperature function is used for representing the maximum bearing temperature of the battery system at the initial charging moment;
acquiring a battery heat generation function, wherein the battery heat generation function is used for representing the heat generation amount of the battery system in the charging process;
acquiring an environmental heat exchange function, wherein the environmental heat exchange function is used for representing the heat exchange between the battery system and the environment in the charging process;
and constructing and obtaining the ideal temperature rise curve based on the maximum bearing temperature function, the battery heat generation capacity function and the environment heat exchange capacity function.
6. The method of claim 5, wherein the step of obtaining a maximum bearing temperature function comprises the steps of:
acquiring the charged temperature of the battery system as a second temperature, wherein the second temperature is related to the residual electric quantity of the battery system after charging;
acquiring a temperature rise function, wherein the temperature rise function is used for representing the maximum temperature rise condition of the battery system after being charged at the initial charging moment;
and constructing and obtaining the maximum bearing temperature function based on the second temperature and the temperature rise function.
7. The method for rapidly cooling a lithium-ion power battery according to claim 6, wherein the step of obtaining the temperature rise function comprises the steps of:
obtaining a maximum charging current time function according to the maximum charging current time curve;
and constructing and obtaining the temperature rise function according to the maximum charging current time function.
8. The control system of the lithium ion power battery quick charge cooling method is characterized by comprising the following components:
the first acquisition module is configured to acquire a first current electric quantity of the battery system, wherein the first current electric quantity is the residual electric quantity of the battery system at the current moment;
the first calculation module is configured to set a first preset electric quantity difference value and obtain a first target electric quantity, and the first target electric quantity is the residual electric quantity of the battery system after the first preset electric quantity difference value is charged by the first current electric quantity;
the second acquisition module is configured to obtain a first temperature according to the first target electric quantity;
the third acquisition module is configured to obtain a first ideal temperature corresponding to the first target electric quantity according to an ideal temperature rise curve, and the ideal temperature rise curve represents the maximum temperature of the battery system in a certain residual electric quantity;
and the generation module is configured to generate a cooling start instruction when the first temperature is judged to be greater than the first ideal temperature, wherein the cooling start instruction is used for driving a cooling system to start.
9. A terminal device comprising a processor and a memory, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the lithium ion power battery rapid charge cooling method of any one of claims 1-7.
10. A readable storage medium, wherein a program or instructions is stored on the readable storage medium, which when executed by a processor, implements the lithium ion power battery fast charge cooling method according to any one of claims 1-7.
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