CN114475364A - Timing heat preservation method and device for battery pack and electronic equipment - Google Patents

Timing heat preservation method and device for battery pack and electronic equipment Download PDF

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Publication number
CN114475364A
CN114475364A CN202210208255.1A CN202210208255A CN114475364A CN 114475364 A CN114475364 A CN 114475364A CN 202210208255 A CN202210208255 A CN 202210208255A CN 114475364 A CN114475364 A CN 114475364A
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battery pack
temperature
target temperature
heat preservation
determining
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CN114475364B (en
Inventor
李新
吴清平
王帅
葛长青
邵迪迪
张俊
杨亮
陈洪亮
曹斌
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/60—Navigation input
    • B60L2240/66—Ambient conditions
    • B60L2240/662—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Secondary Cells (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)

Abstract

The invention provides a timing heat preservation method and device for a battery pack and electronic equipment, relates to the technical field of heat preservation of battery packs, and comprises the following steps: determining a target temperature of the battery pack and a battery pack characteristic curve based on the current ambient temperature, wherein the target temperature is used for representing the temperature at which the battery pack starts to be subjected to heat preservation operation; determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack; the battery system is awakened regularly based on each heat preservation moment, the battery pack is subjected to heat preservation according to the target temperature, and the heat preservation operation is performed on the battery pack regularly, so that the good performance output of the battery can be realized on the basis of relieving the technical problem that the cost consumption is high in the prior art.

Description

Timing heat preservation method and device for battery pack and electronic equipment
Technical Field
The invention relates to the technical field of battery pack heat preservation, in particular to a timing heat preservation method and device for a battery pack and electronic equipment.
Background
With the development of vehicle technology, the daily travel of the applied vehicle becomes a relatively common transportation mode. In the practical application process, new energy vehicles such as electric vehicles and the like are also widely concerned by people.
At present in order to improve driver's experience, often keep warm through the battery package to electric automobile for the driver can carry out quick start to the vehicle, guarantees that the battery has good performance output. However, the inventor researches and discovers that the current battery pack thermal insulation method is rough and has certain defects, such as the requirement of consuming larger monitoring cost and heating cost.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for timing and maintaining temperature of a battery pack, and an electronic device, which perform a temperature maintaining operation on the battery pack in a timing manner, so as to achieve good performance output of a battery while alleviating the technical problem of high cost consumption in the prior art.
In a first aspect, an embodiment provides a method for timing heat preservation of a battery pack, the method including:
determining a target temperature of a battery pack and a battery pack characteristic curve based on the current ambient temperature, wherein the target temperature is used for representing the temperature for starting the heat preservation operation of the battery pack;
determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack;
and awakening the battery system at regular time based on each heat preservation moment, and preserving the heat of the battery pack according to the target temperature.
In an alternative embodiment, the step of determining the target temperature of the battery pack and the battery pack characteristic curve based on the current ambient temperature includes:
determining a target temperature of the battery pack and a heat transfer coefficient corresponding to the current ambient temperature based on the current ambient temperature;
determining a battery pack characteristic curve of the battery pack according to the heat transfer coefficient.
In an alternative embodiment, the step of determining the target temperature of the battery pack according to the current ambient temperature includes:
judging whether the current environment temperature is matched with a first preset temperature range or a second preset temperature range;
if the current ambient temperature is matched with the first preset temperature range, determining a first target temperature of the battery pack based on the first preset temperature range corresponding to the current ambient temperature;
and if the current ambient temperature is matched with the second preset temperature range, determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current ambient temperature.
In an optional embodiment, the step of determining a first target temperature of the battery pack based on the first preset temperature range corresponding to the current ambient temperature includes:
determining the state of charge of the battery pack at the current moment and the continuous discharge power corresponding to the state of charge according to the cruising constant speed requirement corresponding to the battery pack in a first preset temperature range;
determining a first target temperature of the battery pack based on the sustained discharge power.
In an optional embodiment, the step of determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current ambient temperature includes:
determining a second target temperature of the battery pack according to a working requirement of the battery pack corresponding to a second preset temperature range; and the second target temperature is the temperature for normal charge and discharge of the battery pack.
In an optional embodiment, the step of determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the battery pack characteristic curve includes:
predicting the temperature of the battery pack at the next moment according to the temperature of the battery pack at the current moment and the characteristic curve of the battery pack;
determining a next heat preservation time when the battery pack reaches the target temperature based on the current time temperature, the next time temperature and the heat transfer coefficient of the battery pack;
and taking the next heat preservation time as a new current time, and determining the new next heat preservation time until the heat preservation operation is terminated.
In an optional embodiment, the step of waking up the battery system at regular time based on each heat preservation time and preserving heat of the battery pack according to the target temperature includes:
when the temperature is kept at each heat preservation moment, a battery system is awakened regularly, and whether the battery pack reaches a target temperature at the moment is judged;
if so, keeping the temperature of the battery pack to a dormancy temperature, wherein the dormancy temperature is determined according to the awakening frequency and the service requirement of the battery system;
and if not, the battery system enters a dormant state.
In an alternative embodiment, the step of determining the target temperature of the battery pack and the battery pack characteristic curve based on the current ambient temperature is preceded by the method further comprising:
and controlling the state of charge of the battery pack at the current moment to reach one hundred percent.
In an optional embodiment, if the state of charge of the battery pack at the current time does not reach one hundred percent, the step of determining the target temperature of the battery pack based on the current ambient temperature includes:
and determining the continuous discharge power and a third target temperature of the battery pack according to service requirements corresponding to the current ambient temperature, wherein the third target temperature is higher than the first target temperature and the second target temperature, and the service requirements comprise a cruise constant speed requirement and an operation requirement.
In a second aspect, an embodiment provides a timing and thermal insulation device for a battery pack, the device comprising:
the battery pack temperature control device comprises a first determination module, a second determination module and a control module, wherein the first determination module determines a target temperature of a battery pack and a battery pack characteristic curve based on the current ambient temperature, and the target temperature is used for representing the temperature for starting the heat preservation operation of the battery pack;
the second determining module is used for determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack;
and the heat preservation module is used for awakening the battery system at regular time based on each heat preservation moment and preserving heat of the battery pack according to the target temperature.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
According to the timing heat preservation method, device and electronic equipment for the battery pack, the target temperature and the battery pack characteristic curve corresponding to the battery pack are determined according to the current ambient temperature of the battery pack or a vehicle, each heat preservation time of the battery pack is obtained based on the curve and the target temperature, the battery system is awakened at each heat preservation time, the battery system carries out heat preservation and heating on the battery pack reaching the target temperature, the energy waste phenomenon caused by real-time heat preservation and monitoring of the battery pack is avoided, and the purposes of battery heat preservation and energy saving of the battery awakening system at the heat preservation time are achieved by predicting the heat preservation time meeting business requirements.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for timing and maintaining temperature of a battery pack according to an embodiment of the present invention;
fig. 2 is a characteristic diagram of a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an application of another method for timing and maintaining temperature of a battery pack according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a timing and temperature keeping device for a battery pack according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The current battery pack heat preservation mode is mainly to heat and preserve heat for battery packs with temperature values lower than preset temperature values. That is, this kind of mode uses the temperature condition as the operation trigger, and battery system needs to continue to monitor the battery package state, and the heat preservation system needs to continue to carry out heat treatment to the battery package, and the cost is relatively high.
In addition, the preset temperature value is preset by the staff according to experience, the preset temperature value obtained according to the mode controls the heat preservation of the battery pack, the temperature requirement of the battery pack in practical application is possibly exceeded, and heating energy waste is caused to a certain degree.
Based on this, the timing heat preservation method and apparatus for the battery pack and the electronic device provided by the embodiments of the present invention wake up the battery system at a timing by predicting the heat preservation wake-up time, and realize the heat preservation of the battery pack according to the target temperature determined by the actual power demand, thereby saving energy consumption.
To facilitate understanding of the embodiment, a detailed description will be first given of a timing and heat preservation method based on a battery pack, which is disclosed in the embodiment of the present invention and can be applied to a vehicle controller, where the vehicle controller includes a Real-Time Clock (RTC).
Fig. 1 is a flowchart of a timing heat preservation method for a battery pack according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
step S102, determining a target temperature of the battery pack and a battery pack characteristic curve based on the current environment temperature.
The target temperature is used for representing the temperature at which the battery pack starts to be subjected to heat preservation operation, the current environment temperature is the temperature of the current battery pack and the environment where the current vehicle is located, and the battery pack characteristic curve is a curve of the battery pack subjected to temperature change along with time and reflects the temperature rise and temperature drop characteristics of the battery pack; it is understood that the battery pack may correspond to different target temperatures and battery pack characteristics at different ambient temperatures.
And step S104, determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack.
It should be noted that, according to the curve reflecting the temperature change characteristic of the battery pack, according to the temperature of the battery pack at each time and the target temperature for starting heating, each heat preservation time at which temperature heating is required can be determined.
And S106, awakening the battery system at regular time based on each heat preservation moment, and preserving heat of the battery pack according to the target temperature.
The battery system is awakened at regular time according to the real heat preservation time, and the heat preservation operation is carried out on the battery pack reaching the target temperature instead of carrying out heat preservation and monitoring on the battery pack in real time.
In a preferred embodiment of practical application, a target temperature and a battery pack characteristic curve corresponding to a battery pack are determined according to the current ambient temperature of the battery pack or a vehicle, each heat preservation time of the battery pack is obtained based on the curve and the target temperature, a battery system is awakened at each heat preservation time, the battery system is used for carrying out heat preservation and heating on the battery pack reaching the target temperature, the phenomenon of energy waste caused by real-time heat preservation and monitoring of the battery pack is avoided, and the purposes of battery heat preservation and energy saving by awakening the system at the heat preservation time are achieved by predicting the heat preservation time meeting business requirements.
In some embodiments, the timed incubation method may be performed after the battery pack is charged, so that the incubation process is less costly after charging is completed. As an example, before the step S102, the following steps may be included:
and 1.1) controlling the state of charge of the battery pack at the current moment to reach one hundred percent.
It can be understood that when the state of charge SOC reaches one hundred percent, the battery pack charging is complete; in some embodiments, a subsequent heat preservation operation can be performed on the basis of the operation, so that the effect of preserving the heat of the battery pack at a lower cost is achieved.
In some embodiments, the temperature of the position point of the battery module at which the temperature decreases fastest may be detected to simulate a corresponding temperature characteristic curve at the corresponding ambient temperature, and in a heat preservation scene of the battery pack, taking the temperature decrease curve as an example, step S102 exemplarily includes:
and 2.1) determining a target temperature of the battery pack and a heat transfer coefficient corresponding to the current environment temperature based on the current environment temperature.
The heat transfer coefficients of the battery pack in different environmental temperatures are different, and therefore the time for cooling to the target temperature in the corresponding environment is different.
And 2.2) determining a battery pack characteristic curve of the battery pack according to the heat transfer coefficient. As shown in fig. 2, the temperature drop curve corresponding to an ambient temperature of-20 ℃ and the temperature drop curve corresponding to an ambient temperature of-40 ℃.
It should be noted that, based on the characteristic curve, the temperature drop of the battery pack at each time point at the ambient temperature can be obtained, that is, the time required to reach the corresponding target temperature at the ambient temperature can be obtained.
As an alternative embodiment, the inventor researches and discovers that the temperature sensors can be arranged at the middle position of the top of each battery module and at one end position of the top, and the temperature measured at the positions is not higher than the real temperature of the module battery core under the low-temperature working condition; under the high temperature operating mode, it is not less than the true temperature of module electricity core. In the simulation process of the cooling characteristic curve, the battery system BMS selects a temperature value corresponding to a position with the fastest temperature drop from the temperature 1 acquired by the middle position sensor of each module in the battery pack, the temperature 2 acquired by the end position sensor and the average temperature 3 of the module, and the temperature value is used as the temperature of the current moment to participate in curve simulation.
In some embodiments, different target temperatures can be determined according to different environmental temperatures, so that heat preservation control is realized according to the target temperature meeting the environmental temperature, and the cost is lower under the condition that the battery heat preservation control meets the scene requirement; for example, the step of determining the target temperature of the battery pack according to the current ambient temperature in step S102 includes:
and 3.1) judging whether the current environment temperature is matched with a first preset temperature range or a second preset temperature range.
The first preset temperature range can be greater than or equal to-20 ℃, the second preset temperature range can be greater than-40 ℃ and less than-20 ℃, and the temperature range to which the temperature sensor belongs is determined according to the current environment temperature.
And 3.2) if the temperature is matched with the first preset temperature range, determining a first target temperature of the battery pack based on the first preset temperature range corresponding to the current environment temperature.
Exemplarily, the state of charge of the battery pack at the current moment and the continuous discharge power corresponding to the state of charge are determined according to the cruise constant-speed requirement corresponding to the first preset temperature range of the battery pack; a first target temperature of the battery pack is then determined based on the sustained discharge power.
For example, under the working condition of being greater than or equal to-20 ℃, if the heat-preserved battery pack needs to meet the constant-speed cruising speed of 120km/h, the corresponding continuous discharge power needs to be greater than 39kw, and under the condition of finishing charging, the temperature at which the continuous discharge power can reach to be greater than 39kw is-10 ℃, namely the first target temperature is-10 ℃.
And 3.3) if the temperature of the battery pack is matched with the second preset temperature range, determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current environment temperature.
Exemplarily, a second target temperature of the battery pack is determined according to a working requirement of the battery pack corresponding to a second preset temperature range; and the second target temperature is the temperature for normal charge and discharge of the battery pack.
For example, under the working condition that the temperature is higher than-40 ℃ and lower than-20 ℃, the heat-preserved battery pack needs to meet the requirement that normal charge and discharge can be ensured, the lowest temperature of the battery core is maintained to be higher than or equal to-18 ℃, and the first target temperature is-18 ℃ under the condition that the charge is completed.
It can be understood that each temperature range corresponds to a target temperature of the battery pack, so that heat preservation control can be performed according to the target temperature, and energy consumption can be saved under the condition that the working conditions corresponding to the temperature ranges are met.
As an optional embodiment, if the state of charge of the battery pack at the current time does not reach one hundred percent, the embodiment of the present invention may also perform a heat preservation operation to increase the driving mileage, and the step of determining the target temperature of the battery pack based on the current ambient temperature in step S102 includes:
and 4.1) determining the continuous discharge power and the third target temperature of the battery pack according to the service requirement corresponding to the current environment temperature.
Wherein the third target temperature is higher than the first target temperature and the second target temperature, and the traffic demand includes a cruise demand and an operation demand.
When the state of charge of the battery pack at the current time is less than one hundred percent, that is, when charging is not completed, in order to achieve the power required for starting the vehicle, the third target temperature for starting and keeping the temperature of the current battery is higher than the first target temperature and the second target temperature when charging is completed. At the moment, although the application cost of heat preservation is increased, compared with a heat preservation scheme of charging completion, the scheme of heat preservation or starting after the charging completion can increase the capacity of the battery core in the battery pack under the action of the current higher third target temperature, and further increase the electric quantity of the whole vehicle, so that the vehicle can have more endurance mileage. In addition, under the action of the third target temperature, extra heating operation is not needed to be carried out on the battery pack in the running process, and power consumption is saved.
In some embodiments, the battery can be warmed by predicting each warming time, so as to enable the waking system to warm the battery at the time, and avoid a phenomenon of cost waste caused by continuously monitoring and warming the battery, for example, step S104 may be further implemented by the following steps, specifically:
and 5.1) predicting the temperature of the battery pack at the next moment according to the temperature of the battery pack at the current moment and the characteristic curve of the battery pack.
Wherein, the temperature of the battery pack at each moment can be predicted according to the battery pack characteristic curve.
And 5.2) determining the next heat preservation time when the battery pack reaches the target temperature based on the current time temperature, the next time temperature and the heat transfer coefficient of the battery pack.
For example, the interval when the current time reaches the next keeping temperature time can be known according to the following formula:
Figure BDA0003532049150000101
wherein, Δ T is a time interval, C is an average specific heat capacity of the battery module, m is an average mass of a single battery cell, and T isiThe battery temperature is the battery temperature at the moment i, the battery temperature after the moment i +1 is Ti +1, Ta is the current environment temperature, and alpha is the heat transfer coefficient of the real vehicle.
And 5.3) taking the next heat preservation time as a new current time, and determining the new next heat preservation time until the heat preservation operation is terminated.
It is understood that when the next keeping warm moment is reached, the next keeping warm moment is used as a new current moment, and the steps 5.1) -5.2) are executed to determine a new next keeping warm moment until the keeping warm is terminated.
It should be noted that the time interval between the current time and the next temperature keeping time needs to be determined according to the service life of the vehicle charging relay and the preset switching times, that is, the time interval between the current time and the next temperature keeping time cannot be smaller than the time interval.
In some embodiments, the battery system is awakened to perform heating and heat preservation operation on the battery at the heat preservation time, so that energy is saved compared with the real-time monitoring and heat preservation of the battery state; illustratively, the step S106 may include:
and 6.1) awakening the battery system at regular time when the temperature is kept at each heat preservation moment, and judging whether the battery pack reaches the target temperature at the moment.
And 6.2) if the temperature reaches the dormancy temperature, keeping the temperature of the battery pack to the dormancy temperature.
Wherein the sleep temperature is determined according to the wake-up frequency and the service requirement of the battery system. It can be understood that the sleep temperature is the temperature at which the heating and heat preservation is terminated this time, that is, when the battery pack is heated to the sleep temperature, the heating is stopped, and the battery system enters the sleep state.
And 6.3), if the current state is not reached, the battery system directly enters a dormant state.
Fig. 3 is an application schematic diagram of a timing heat preservation method for a battery pack according to an embodiment of the present invention.
Under the condition that the current environment temperature is-20 ℃, when a charging gun is connected with a vehicle to charge the battery, and when the SOC of the battery reaches one hundred percent, namely the charging is finished, determining the next heat preservation time according to the target temperature corresponding to the current environment temperature of-10 ℃, the temperature of the battery pack at the current time and the characteristic curve of the battery pack; at this time, the battery system BMS enters a sleep state; and when the next heat preservation time is reached, judging whether the current battery pack reaches-10 ℃, if so, carrying out heat preservation starting, heating the battery pack to the dormancy temperature of-7 ℃ corresponding to the current environment temperature, and determining the next heat preservation time according to the temperature of the battery pack at the current time and the characteristic curve of the battery pack at the current time until the heat preservation operation is terminated.
It should be noted that, in the process of battery heat preservation, the charging gun is always in the gun inserting state; the time interval between the next heat preservation moments is shorter and shorter, namely, the time interval between the first heat preservation starting moment and the second heat preservation starting moment is longer than the time interval between the second heat preservation starting moment and the third heat preservation starting moment, and so on.
According to the embodiment of the invention, different target temperatures are determined by dividing the battery requirements corresponding to different environmental temperatures, the heat preservation operation is controlled according to the corresponding target temperature based on the battery pack at the corresponding temperature, excessive heat preservation is avoided on the basis of meeting the power requirement of the current scene, energy is saved, on the basis, the next heat preservation time is predicted through the characteristic curve of the battery pack, the heat preservation operation on the battery pack is awakened, the monitoring and heating operation on the battery pack are not needed in real time, and the cost is saved.
As shown in fig. 4, an embodiment of the present invention further provides a timing and thermal insulation device 200 for a battery pack, where the device includes:
the first determining module 201 is used for determining a target temperature of a battery pack and a battery pack characteristic curve based on the current ambient temperature, wherein the target temperature is used for representing the temperature for starting the heat preservation operation of the battery pack;
the second determining module 202 is used for determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack;
and the heat preservation module 203 is used for waking up the battery system at regular time based on each heat preservation moment and preserving heat of the battery pack according to the target temperature.
In some embodiments, the first determining module 201 is further specifically configured to determine a target temperature of the battery pack and a heat transfer coefficient corresponding to the current ambient temperature based on the current ambient temperature; determining a battery pack characteristic curve of the battery pack according to the heat transfer coefficient.
In some embodiments, the first determining module 201 is further specifically configured to determine whether the current ambient temperature matches a first preset temperature range or a second preset temperature range; if the current ambient temperature is matched with the first preset temperature range, determining a first target temperature of the battery pack based on the first preset temperature range corresponding to the current ambient temperature; and if the current ambient temperature is matched with the second preset temperature range, determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current ambient temperature.
In some embodiments, the first determining module 201 is further specifically configured to determine, according to a cruise fixed-speed requirement corresponding to the battery pack in a first preset temperature range, a state of charge of the battery pack at the current time and a sustained discharge power corresponding to the state of charge; determining a first target temperature of the battery pack based on the sustained discharge power.
In some embodiments, the first determining module 201 is further specifically configured to determine a second target temperature of the battery pack according to a working requirement of the battery pack corresponding to a second preset temperature range; and the second target temperature is the temperature for normal charge and discharge of the battery pack.
In some embodiments, the second determining module 202 is further specifically configured to predict a next-time temperature of the battery pack according to the current-time temperature of the battery pack and the battery pack characteristic curve; determining a next heat preservation time when the battery pack reaches the target temperature based on the current time temperature, the next time temperature and the heat transfer coefficient of the battery pack; and taking the next heat preservation time as a new current time, and determining the new next heat preservation time until the heat preservation operation is terminated.
In some embodiments, the heat preservation module 203 is further specifically configured to wake up the battery system at regular time when the battery pack is at each of the heat preservation time, and determine whether the battery pack reaches a target temperature at the time; if so, keeping the temperature of the battery pack to a dormancy temperature, wherein the dormancy temperature is determined according to the awakening frequency and the service requirement of the battery system; and if not, the battery system enters a dormant state.
In some embodiments, the first determining module 201 is further specifically configured to control the state of charge of the battery pack at the current time to reach one hundred percent before the step of determining the target temperature of the battery pack and the battery pack characteristic curve based on the current ambient temperature.
In some embodiments, if the state of charge of the battery pack at the current time does not reach one hundred percent, the first determining module 201 is further specifically configured to determine a sustained discharge power and a third target temperature of the battery pack according to a service requirement corresponding to the current ambient temperature, where the third target temperature is higher than the first target temperature and the second target temperature, and the service requirement includes a cruise speed setting requirement and an operation requirement.
Fig. 5 is a schematic hardware architecture diagram of an electronic device 300 according to an embodiment of the present invention. Referring to fig. 5, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may further include a non-volatile storage medium 303, a communication interface 304, and a bus 305; among other things, the machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other via a bus 305. The processor 302 may perform the timing and temperature keeping method of the battery pack described in the above embodiments by reading and executing the machine executable instructions in the machine readable storage medium 301.
A machine-readable storage medium as referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, or a combination thereof.
It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program, and when executed, the computer program code may implement the timing heat preservation method for a battery pack according to any of the above embodiments, and for specific implementation, reference may be made to the method embodiments, and details are not repeated here.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.

Claims (12)

1. A method for timed incubation of a battery pack, the method comprising:
determining a target temperature of a battery pack and a battery pack characteristic curve based on the current ambient temperature, wherein the target temperature is used for representing the temperature for starting the heat preservation operation of the battery pack;
determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack;
and awakening the battery system at regular time based on each heat preservation moment, and preserving the heat of the battery pack according to the target temperature.
2. The method of claim 1, wherein the step of determining a target temperature for the battery pack and a battery pack characteristic based on the current ambient temperature comprises:
determining a target temperature of the battery pack and a heat transfer coefficient corresponding to the current ambient temperature based on the current ambient temperature;
determining a battery pack characteristic curve of the battery pack according to the heat transfer coefficient.
3. The method of claim 2, wherein determining the target temperature of the battery pack based on the current ambient temperature comprises:
judging whether the current environment temperature is matched with a first preset temperature range or a second preset temperature range;
if the current ambient temperature is matched with the first preset temperature range, determining a first target temperature of the battery pack based on the first preset temperature range corresponding to the current ambient temperature;
and if the current ambient temperature is matched with the second preset temperature range, determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current ambient temperature.
4. The method of claim 3, wherein the step of determining the first target temperature of the battery pack based on the first preset temperature range corresponding to the current ambient temperature comprises:
determining the state of charge of the battery pack at the current moment and the continuous discharge power corresponding to the state of charge according to the cruising constant speed requirement corresponding to the battery pack in a first preset temperature range;
determining a first target temperature of the battery pack based on the sustained discharge power.
5. The method of claim 3, wherein the step of determining a second target temperature of the battery pack based on the second preset temperature range corresponding to the current ambient temperature comprises:
determining a second target temperature of the battery pack according to a working requirement of the battery pack corresponding to a second preset temperature range; and the second target temperature is the temperature for normal charge and discharge of the battery pack.
6. The method of claim 1, wherein determining each incubation time based on the target temperature, the temperature of the battery pack at each time, and the battery pack characteristic curve comprises:
predicting the temperature of the battery pack at the next moment according to the temperature of the battery pack at the current moment and the characteristic curve of the battery pack;
determining a next heat preservation time when the battery pack reaches the target temperature based on the current time temperature, the next time temperature and the heat transfer coefficient of the battery pack;
and taking the next heat preservation time as a new current time, and determining the new next heat preservation time until the heat preservation operation is terminated.
7. The method of claim 1, wherein the step of waking up the battery system periodically based on each of the heat-preservation time instants and preserving the temperature of the battery pack according to the target temperature comprises:
when the temperature is kept at each heat preservation moment, a battery system is awakened regularly, and whether the battery pack reaches a target temperature at the moment is judged;
if so, keeping the temperature of the battery pack to a dormancy temperature, wherein the dormancy temperature is determined according to the awakening frequency and the service requirement of the battery system;
and if not, the battery system enters a dormant state.
8. The method of claim 1, wherein the step of determining a target temperature for the battery pack and a battery pack characteristic based on the current ambient temperature is preceded by the method further comprising:
and controlling the state of charge of the battery pack at the current moment to reach one hundred percent.
9. The method of claim 3, wherein if the state of charge of the battery pack at the current time does not reach one hundred percent, the step of determining the target temperature of the battery pack based on the current ambient temperature comprises:
and determining the continuous discharge power and a third target temperature of the battery pack according to service requirements corresponding to the current ambient temperature, wherein the third target temperature is higher than the first target temperature and the second target temperature, and the service requirements comprise a cruise constant speed requirement and an operation requirement.
10. A timed insulating device for a battery pack, said device comprising:
the battery pack temperature control device comprises a first determination module, a second determination module and a control module, wherein the first determination module determines a target temperature of a battery pack and a battery pack characteristic curve based on the current ambient temperature, and the target temperature is used for representing the temperature for starting the heat preservation operation of the battery pack;
the second determining module is used for determining each heat preservation time according to the target temperature, the temperature of the battery pack at each time and the characteristic curve of the battery pack;
and the heat preservation module is used for awakening the battery system at regular time based on each heat preservation moment and preserving heat of the battery pack according to the target temperature.
11. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 9 when executing the computer program.
12. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 9.
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