CN110931918A - Battery pack device and battery pack device preheating method - Google Patents
Battery pack device and battery pack device preheating method Download PDFInfo
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- CN110931918A CN110931918A CN201911235228.8A CN201911235228A CN110931918A CN 110931918 A CN110931918 A CN 110931918A CN 201911235228 A CN201911235228 A CN 201911235228A CN 110931918 A CN110931918 A CN 110931918A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a battery pack device and a battery pack preheating method. The battery pack device comprises a battery core, a heating sheet, a heating switch, a sensor and a controller, wherein an active substance is arranged in the battery core, and the heating sheet is positioned in the battery core and used for heating the battery core; the heating switch is connected with the heating sheet to control the heating sheet to be powered on or powered off; the sensor is used for detecting the temperature of the battery core, and the controller is coupled with the sensor and the heating switch and used for controlling the heating switch according to the detection value of the sensor. The application provides a battery package device can heat electric core in short time, has improved the battery package and has put preheating rate.
Description
Technical Field
The application relates to the technical field of energy power, in particular to a battery pack device and a preheating method of the battery pack device.
Background
The battery pack is used as a core power component of the electric automobile, and plays a vital role in the control performance, safety, service life and the like of the electric automobile. The discharge performance and charge acceptance of the battery pack are very sensitive to temperature variations. In a low-temperature environment, the active materials in the battery pack are in an inactive or inactivated state, so that the battery pack is low in charging efficiency.
In the conventional art, a battery pack is heated by an external heating device to recover the activity of an active material inside the battery pack, thereby improving the charging efficiency of the battery pack. However, since heat generated by the external heating device is transferred from the outside of the battery pack to the active material inside the battery pack, the heat generated by the heating device heats the outside of the battery pack first and then heats the active material, which results in low efficiency in heating the active material inside the battery pack.
Disclosure of Invention
The application provides a battery pack device. The application provides a heating plate of heating electric core is located the inside of electric core for the heat that the heating plate produced is from the inside outside transmission of electric core, heats electric core in short time, improves the battery pack and puts reservation rate. The application also provides a preheating method for the battery pack device.
In a first aspect, the present application provides a battery pack apparatus. The battery pack device comprises a battery core, a heating sheet, a heating switch, a sensor and a controller, wherein an active substance is arranged in the battery core, and the heating sheet is positioned in the battery core and used for heating the battery core; the heating switch is connected with the heating sheet to control the heating sheet to be powered on or powered off; the sensor is used for detecting the temperature of the battery core, and the controller is coupled with the sensor and the heating switch and is used for controlling the heating switch according to the detection value of the sensor.
In one embodiment, the heating switch is located inside the battery cell, the battery cell includes a negative electrode tab, and the negative electrode tab is connected to the heating sheet through the heating switch, so as to heat the heating sheet by using the energy of the battery cell itself.
In an embodiment, the number of the battery cells is multiple, the heating plate and the heating switch are disposed inside each of the battery cells, and the controller is coupled to the plurality of battery cells to control the plurality of heating switches respectively.
In a second aspect, the present application further provides a battery pack preheating method. The battery pack device comprises a battery core and a heating sheet positioned in the battery core, active substances are arranged in the battery core,
the battery pack preheating method comprises the following steps:
acquiring a charging instruction;
acquiring the temperature of the battery cell;
and when the temperature of the battery cell is less than or equal to a first preset temperature, the heating sheet is electrified and generates heat.
In one embodiment, after the heating sheet is energized and generates heat, the battery pack preheating method further includes:
when the temperature of the battery core is greater than or equal to a second preset temperature, the heating sheet is powered off, and the battery pack device is charged; wherein the second preset temperature is greater than the first preset temperature.
In one embodiment, the step of heating the heat patch comprises:
determining the internal residual electric quantity of the battery pack;
when the residual electric quantity in the battery pack is larger than or equal to the preset electric quantity, the residual electric quantity in the battery pack heats the heating sheet.
In one embodiment, the step of heating the heat patch comprises:
the heating circuit is communicated with a charger, the charger heats the heating sheet, and the charger is used for charging the battery pack device.
In one embodiment, after the heating sheet is energized and generates heat, the battery pack preheating method further includes:
and detecting the current flowing through the heating plate in real time, and controlling the heating plate to be powered off when the current is larger than or equal to the warning current.
In one embodiment, after the heating sheet is energized and generates heat, the battery pack preheating method further includes:
and detecting the temperature rising rate of the battery core in real time, and controlling the heating plate to be powered off when the rate is greater than or equal to the warning rate.
In one embodiment, before the acquiring the temperature of the battery cell and after the acquiring the charging instruction, the battery pack preheating method further includes:
determining that the heating plate is powered off.
In the embodiment of the application, when the temperature of the battery cell is less than or equal to a first preset temperature value, the heating sheet is controlled to be electrified and generate heat. Because the heating plate is located inside the battery core, heat generated by the heating plate is transmitted outwards from the inside of the battery core, and the battery core is heated in a short time, so that the activity of active substances in the battery core is activated, and the working efficiency of the battery pack device is improved. And the inside heating mode of electric core can avoid the outside inhomogeneous problem of being heated that makes electric core inside of electric core.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a battery pack device according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a portion of the battery pack apparatus of FIG. 1;
fig. 3 is a schematic flow chart of a battery pack preheating method provided by the present application in a first embodiment;
FIG. 4 is a schematic flow chart of step S130 shown in FIG. 3 in a first embodiment;
FIG. 5 is a schematic flow chart of step S130 shown in FIG. 3 in a second embodiment;
fig. 6 is a schematic flow chart of a battery pack preheating method provided by the present application in a second embodiment.
Detailed Description
Technical solutions in embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
The inventor finds that the charging time of the electric automobile on the market is longer under the condition of lower temperature, the main reason is that the temperature of the battery is low, and active substances (lithium ions) in the battery are in an inactive state, so that the battery is heated in a half of the whole charging process, the charging efficiency of the electric automobile and the endurance mileage of the whole electric automobile are reduced, and the popularization and the application of the electric automobile are seriously influenced. In the conventional battery heating method, active substances (lithium ions) in the battery are heated mainly by an external device, and the heating method transfers heat through the surface of the battery, so that the battery is heated unevenly and has low efficiency. Based on the above research, the embodiment of the invention provides a battery pack with controllable heating temperature and a battery pack system, which can solve the problem that the existing battery pack is poor in charging quality.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack device according to an embodiment of the present disclosure. The embodiment of the present application provides a battery pack apparatus 100. The battery pack apparatus 100 can provide power to an electronic device to which the battery pack is applied. The electronic equipment can be electric vehicles, power generation equipment, unmanned underwater vehicles, caravan power supplies, base station standby power supplies and the like. In the embodiment of the present application, the electronic device is described as an example of an electric vehicle.
The battery pack apparatus 100 includes the battery cells 11. The active material is arranged inside the battery cell 11. The active substance arranged in the battery cell 11 can provide a power source for the electric automobile to drive the electric automobile to run. In the embodiment of the present application, the battery cell 11 is described as an example of a lithium battery.
The cell 11 refers to a single electrochemical cell 11 having a positive electrode and a negative electrode. The battery cells 11 generally cannot be used directly, and the battery pack apparatus 100 can be used directly. When the battery cell 11 has a casing and a protection circuit, the battery pack apparatus 100 can be used as it is.
The heating sheet 12 is arranged inside the battery cell 11. The heating sheet 12 is used to heat the cell 11. In one embodiment, the heater chip 12 is a resistance wire. The resistance wire is an electrical element which generally converts electrical energy into internal energy. After the resistance wire is electrified, the resistance wire can rapidly generate heat, so that the purpose of heating the battery cell 11 is achieved. As can be appreciated, the heater chip 12 is located inside the cell 11. The heating sheet 12 does not chemically react with the active substance inside the battery cell 11, so that the stability of the active substance inside the battery cell 11 can be ensured.
In one embodiment, the resistance wire can be a nickel sheet with good thermal conductivity. When the heating switch is closed, the nickel sheet can quickly generate heat after being electrified.
The battery pack apparatus 100 further includes a heating switch 13, a sensor 14, and a controller 15. The heating switch 13 is connected to the heating plate 12 to control the heating plate 12 to be powered on or off. When the heating switch 13 is closed, the heating sheet 12 is energized to release heat, thereby heating the battery cell 11. The sensor 14 is used to detect the temperature of the battery cell 11. The controller 15 is coupled to the heating switch 13 and the sensor 14. The controller 15 is configured to control the heating switch 13 according to a detection value of the sensor 14. For example, when the temperature of the battery cell 11 is less than or equal to a first preset temperature, the controller 15 controls the heating switch 13 to be closed.
The controller 15 is a Battery Management System (BMS). The battery management system is an important component of the power battery system of the electric automobile. On one hand, the method detects, collects and preliminarily calculates the real-time state parameters of the battery, and controls the on-off of a power supply loop according to the comparison relationship between a detection value and an allowable value; on the other hand, the acquired key data is reported to the vehicle control unit 15, and the instruction of the controller 15 is received, so as to coordinate with other systems on the vehicle.
In the embodiment of the present application, when the temperature of the battery cell 11 is less than or equal to the first preset temperature value, the heating switch 13 is closed to make the heating sheet 12 generate heat. Since the heating sheet 12 is located inside the battery cell 11, heat generated by the heating sheet 12 is transferred from the inside of the battery cell 11 to the outside, and the battery cell 11 is heated in a short time, so as to activate the activity of the active material inside the battery cell 11, thereby improving the working efficiency of the battery pack apparatus 100. And 11 internal heating's of electric core mode can avoid 11 outsidess of electric core to make 11 internal portions of electric core inhomogeneous problems of being heated.
Referring to fig. 1 and fig. 2, fig. 2 is a schematic circuit diagram of a portion of the battery pack apparatus shown in fig. 1. The heating switch 13 is located inside the cell 11. The battery cell 11 supplies power to the heating plate 11 by using its own energy. The number of the battery cells 11 is plural. Each electric core 11 is internally provided with a heating sheet 12 and a heating switch 13. The controller 15 is respectively coupled to the plurality of battery cells 11 to respectively control the plurality of heating switches 13.
In the embodiment of the present application, the number of the battery cells 11 is multiple, a heating plate 12 is disposed inside each battery cell 11, and a heating switch 13 corresponding to the heating plate 12 is disposed inside each battery cell 11. The controller 15 is respectively connected with the plurality of battery cells 11, so that the controller 15 can control the heating switch 13 inside each battery cell 11, so that the heating sheet 12 can effectively heat the battery cells 11 to be heated, thereby ensuring the heating rate of the battery cells 11 and the safety of each battery cell 11.
In other embodiments, an external power source (e.g., a charger) can also provide power to the heating fins 12. In the embodiment of the present application, the circuit of the battery pack apparatus 100 is not particularly limited. That is, in other embodiments, the external power source is capable of heating the heater chip 12.
In one embodiment, the battery pack apparatus 100 further includes a relay. The relay is connected to the heating switch 13 to limit the amount of current passing through the heating plate 12.
The relay is an electric controller 15 that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) meets a predetermined requirement. It has an interactive relationship between a control system (also called an input loop) and a controlled system (also called an output loop). It is commonly used in automated control circuits, which are actually a "recloser" that uses low current to control high current operation. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like.
In this embodiment of the application, the relay can guarantee that the current passing through the heating plate 12 is small, and avoid passing through the heating plate 12 that the current is too big, so that the heat generated by the heating plate 12 is too high, resulting in the local temperature inside the electric core 11 being too high and damaging the electric core 11, thereby improving the reliability of the battery pack device 100.
In one embodiment, with continued reference to fig. 1 and 2, the heating switch 13 is located inside the battery cell 11. The cell 11 includes a negative tab 111. The negative electrode tab 111 is connected to the heating sheet 12 through the heating switch 13 to heat the heating sheet 12 by using energy of the battery cell 11 itself.
Correspondingly, the cell further comprises a positive tab 112. The battery is divided into positive and negative electrodes, the positive and negative electrode tabs 111 are metal conductors leading out the positive and negative electrodes from the battery cell 11, and the ears of the positive and negative electrodes of the battery are contact points during charging and discharging. This contact point is not the copper sheet that we see on the outside of the cell, but rather a connection inside the cell.
As shown in fig. 1, the negative electrode tab 111 is partially located inside the battery cell 11, and partially located outside the battery cell 11. The heating plate 12 is connected to a negative electrode tab 111 located inside the battery cell 11, and the heating switch 13 is located inside the battery cell 11. As shown in fig. 2, when the switch is in the closed state, the heating sheet 12 and the negative electrode tab 111 of the battery cell 11 are in a short-circuit state, and the heating sheet 12 is heated by energy of the battery cell 11 itself.
In this embodiment of the application, the heating plate 12 is connected with the negative electrode tab 111 of the electric core 11 through the heating switch 13, so that when the heating switch 13 is closed, the negative electrode of the electric core 11 and the heating plate 12 are in a short circuit state, and the energy of the battery pack device 100 itself supplies power to the heating plate 12, without an external power supply, with low cost and convenient operation. In this embodiment, during the discharging process of the battery pack apparatus 100, the internal resistance of the battery cell 11 itself generates heat, and the heat is also transferred from the inside of the battery cell 11 to the outside, so as to further improve the heating efficiency of the battery pack apparatus 100.
In other embodiments, when the heating switch 13 is closed, the heating sheet 12 is electrically connected to the charger, and the charger heats the heating sheet 12. That is, in other embodiments, when the remaining power in the battery cell 11 is insufficient, the heating sheet 12 is powered by the charger.
In one embodiment, the battery pack apparatus 100 further includes a first detector. The first detector is used to detect the current flowing through the heating sheet 12. The controller 15 is coupled to the first detector for controlling the heating switch 13 according to the detection value of the first detector. For example, when the magnitude of the current flowing through the heating sheet 12 is greater than or equal to the warning current, the controller 15 controls the heating switch 13 to be turned off.
In this embodiment, the controller 15 can control the heating switch 13 according to the detection value of the first detector, so as to avoid a phenomenon that the local active material inside the battery cell 11 is heated to a large degree and deactivated due to a large amount of heat generated by the heating sheet 12 in a unit time caused by an excessive current flowing through the heating sheet 12, thereby avoiding the explosion of the battery cell 11 and improving the reliability of the battery pack apparatus 100.
In one embodiment, the battery pack apparatus 100 further includes a second detector. The second detector is used to detect the rate of temperature rise of the cell 11. The controller 15 is coupled to the second detector for controlling the heating switch 13 according to the detection value of the second detector. For example, when the rate of temperature rise of the battery cell 11 is greater than or equal to the alert rate, the controller 15 controls the heating switch 13 to be turned off.
In this embodiment, the controller 15 can control the heating switch 13 according to the detection value of the second detector, so as to avoid the phenomenon that the local active material inside the battery cell 11 is heated to a large extent and is deactivated due to an excessively high heating rate, thereby avoiding the bursting of the battery cell 11 and improving the reliability of the battery pack apparatus 100.
A method for preheating the battery pack apparatus provided in the present application will be described in detail below with reference to the foregoing battery pack apparatus 100. In other embodiments, the battery pack device preheating method may also be used for battery pack devices other than the foregoing embodiments. Wherein the content of the first and second substances,
referring to fig. 3, fig. 3 is a schematic flow chart of a battery pack preheating method according to a first embodiment of the present application. The battery pack device comprises a battery core and a heating sheet positioned inside the battery core. The inside of the battery core is provided with active substances.
The battery pack preheating method includes:
and S110, acquiring a charging instruction.
Wherein the battery management system is capable of detecting a charging instruction. For example, when a plug-in for charging is inserted into the charging port, the battery management system acquires a charging instruction. If the battery management system immediately charges the battery pack device after acquiring the charging command, and the electric vehicle is in a cold place, the internal temperature of the battery pack device is low, and at this time, the active material inside the battery pack device is in an inactive state, which may result in low charging efficiency.
And S120, acquiring the temperature of the battery cell.
The temperature of the battery core is detected by a sensor in the battery pack device. The temperature of the battery core is monitored by the sensor in real time, and when the battery management system needs the temperature of the battery core, the battery management system can determine the temperature of the battery core at the moment. It is understood that the temperature obtained here is the temperature of the battery cells inside the battery pack device.
And S130, electrifying the heating sheet and heating when the temperature of the battery cell is less than or equal to a first preset temperature.
Wherein the first preset temperature value can be within a temperature range of less than 0 degrees. When the temperature of the battery core is less than or equal to 0 ℃, the active substance in the battery core is in an inactive state, and if the battery is charged at the moment, the charging efficiency is low, so that when the temperature of the battery core is less than or equal to a first preset temperature, the heating circuit is closed, so that the heating sheet is electrified and generates heat to heat the battery core.
It can be understood that, when the temperature of the battery cell is greater than the first preset temperature, the charging circuit is closed to charge the battery pack. That is, when the temperature of electric core is greater than first predetermined temperature, the inside active material of electric core is in the active state, need not to heat, can directly charge to electric core this moment.
In this application embodiment, when the inside electric core temperature of battery package device is less than or equal to first preset temperature value, closed heating circuit so that the heating plate circular telegram and generate heat, the heat that the heating plate produced is outside transmission from electric core inside, can heat the battery package in the short time to the efficiency of battery package heating has been improved. In addition, according to the embodiment of the application, the inside of each battery cell in the battery pack is uniformly heated by adopting a mode of heating the inside of the battery cell, so that the heating efficiency of the battery pack device is improved.
And S140, when the temperature of the battery core is greater than or equal to a second preset temperature, powering off the heating sheet and charging the battery pack device.
The charging circuit is connected with the battery core and the charger. It can be understood that when the charging circuit is closed, the charger is electrically connected with the battery cell, and the charger charges the battery cell in the battery pack device. The second preset temperature is greater than the first preset temperature. It can be understood that, when the temperature of the battery core is greater than or equal to the second preset temperature, the active substances inside the battery core are excited to be active, and at the moment, the battery pack device is charged, so that the charging efficiency of the battery pack device can be ensured.
In this application embodiment, when electric core temperature is greater than or equal to the second and predetermines the temperature, stop the heating to the heating plate, avoid electric core high temperature and damage electric core to when electric core temperature heats to be greater than or equal to the second and predetermines the temperature, charge to the battery package device again, can guarantee the activity of the inside active material of electric core, thereby effectively improve charge efficiency.
Before acquiring the temperature of the battery cell and after acquiring the charging instruction, the preheating method for the battery pack device further comprises the following steps:
and determining that the heating plate is powered off.
It can be understood that the battery management system is in the off mode before determining whether the cell temperature is less than or equal to the first preset temperature. If the battery management system judges whether the temperature of the battery core is less than or equal to the first preset temperature, the heating circuit is in a closed mode, and the battery management system controls the heating sheet to be powered off so as to avoid the phenomenon that the battery core does not need to be preheated and the heating sheet is still heated.
In the embodiment of the application, before determining whether the cell temperature is less than or equal to the first preset temperature, it is determined that the heating circuit is in the off mode, so as to avoid the phenomenon that the cell temperature is high and the cell is not required to be preheated, but the cell is still heated by the heating plate, thereby improving the reliability of the preheating method for the battery pack device.
In one embodiment, the second preset temperature can be in the range of 5 to 15 degrees.
Because the active material in the battery cell is in the optimal state within the range of 15-30 degrees, and the battery cell generates heat in the working stage (charging or discharging), the internal resistance of the battery cell increases the internal temperature of the battery cell, so that the internal temperature of the battery cell is prevented from being too high due to the fact that the heat is released in the charging and discharging processes of the battery cell within the range of 5-15 degrees at the second preset temperature, and the reliability of the preheating method for the battery pack is improved.
Referring to fig. 4, fig. 4 is a schematic flowchart illustrating the first embodiment of step S130 shown in fig. 3.
The step of heating the heat patch includes:
s131: and determining the internal residual capacity of the battery pack.
The battery management system monitors the residual electric quantity in the battery pack in real time, and when the battery management system needs to acquire the residual electric quantity of the battery pack, the battery management system can determine the residual electric quantity of the battery pack at the moment.
S132: when the residual electric quantity in the battery pack is larger than or equal to the preset electric quantity, the residual electric quantity in the battery pack heats the heating sheet.
It can be understood that, when the battery pack device discharges, the remaining capacity in the battery pack provides power for the heating sheet, that is, the remaining capacity in the battery pack device is directly called to heat the heating sheet.
In the present embodiment, a security mode is preset, that is,: and discharging the battery pack, judging whether the residual electric quantity of the battery pack is higher than the preset residual electric quantity, and stopping discharging the battery pack if the residual electric quantity of the battery pack is not higher than the preset residual electric quantity. The following method can be specifically adopted: for example, the preset remaining power is 1% of the total power when the battery pack is fully charged, so that at least 1% of the total power is always reserved in the battery pack, and when the charging or reserved charging instruction is obtained and the battery core temperature is judged to be lower than the first preset value, the remaining power in the battery pack device is directly called to preheat the heating plate.
In this application embodiment, the heating plate provides the power through battery package self, utilizes the remaining electric quantity of battery package to heat the heating plate to the second after predetermineeing the temperature, and this kind of preheating mode need not to set up other external equipment that are used for preheating in addition, and is with low costs and convenient operation. In addition, in the embodiment, when the battery pack device discharges to provide power for the heating plate, the internal resistance of the battery core generates heat, and the heat is also transferred from the inside of the battery core to the outside, so that the heating efficiency of the battery pack device is further improved.
The heating of the heating sheet by the energy of the battery pack device may include a low-temperature charging condition and a low-temperature starting condition. The low-temperature charging condition is that the residual electric quantity of the battery pack device is smaller than the preset electric quantity, and the low-temperature starting condition is that the residual electric quantity of the battery pack device is larger than the preset electric quantity. The circuit is the same for both cases, but one more operating condition has been added. The battery pack is required to be charged under the condition that the electric quantity of the battery pack device is low, and the battery pack device is required to be charged and replenished after the electric quantity of the battery pack device is heated under the condition that the electric quantity of the battery pack device is smaller than the preset electric quantity. That is, in other embodiments, when the remaining power of the battery pack apparatus is less than the first preset power, the charging circuit and the heating circuit are both closed, the battery charger charges the battery cell, and the battery cell heats the heating plate by using its own power.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating the second embodiment of step S130 shown in fig. 3.
The step of heating the heat patch includes:
s231: the heating circuit is communicated with the charger, and the charger heats the heating sheet.
The charger is used for charging the battery pack device. It can be understood that, in the embodiments of the present application, a charger is used to provide power for heating the heating plate. It can be understood that, in this embodiment, if the cell temperature is less than or equal to the first preset temperature, the charger is invoked to preheat the heating plate.
In this embodiment, it is mainly considered that under certain conditions, the temperature of the battery core is too low, the residual electric quantity in the battery pack device is used up, and the temperature of the battery core is less than or equal to a first preset temperature, a charger is called to preheat a heating sheet in the battery core, so that the battery pack device is charged after the temperature of the battery core reaches a preset temperature value.
Referring to fig. 6, fig. 6 is a schematic flow chart of a battery pack preheating method according to a second embodiment of the present application. The following mainly illustrates differences between the present embodiment and the first embodiment, and most technical contents of the present embodiment that are the same as those of the first embodiment will not be described in detail herein.
The battery pack preheating method includes:
and S210, acquiring a charging instruction.
Please refer to S110 for the detailed step of S210.
And S220, acquiring the temperature of the battery cell.
Please refer to S120 for the specific step of S220.
And S230, when the temperature of the battery cell is less than or equal to a first preset temperature, electrifying the heating sheet and generating heat.
Please refer to S130 for the detailed step of S230.
And S240, detecting the current flowing through the heating plate in real time, and controlling the heating plate to be powered off when the current is larger than or equal to the warning current.
Wherein, the battery pack device further comprises a first detector. The first detector is used for detecting the current flowing through the heating plate. The battery management system is coupled with the first detector and used for controlling the heating switch according to the detection value of the first detector. When the current flowing through the heating plate is larger than or equal to the warning current, the battery management system controls the heating switch to be switched off so as to cut off the power of the heating plate.
The battery management system can control the heating switch according to the detection value of the second detector, and can avoid the phenomenon that local active substances in the battery cell are heated greatly and are inactivated due to overlarge heating rate, so that the battery cell is prevented from bursting, and the reliability of the preheating method for the battery pack is improved.
In one embodiment, the rate of temperature rise of the battery cell is detected in real time, and when the rate is greater than or equal to a warning rate, the heating plate is controlled to be powered off.
Wherein the battery pack apparatus further comprises a second detector. The second detector is used for detecting the rate of rise of the cell temperature. The battery management system is coupled with the second detector and used for controlling the heating switch according to the detection value of the second detector. When the rate of temperature rise of the battery core is greater than or equal to the warning rate, the battery management system controls the heating switch to be switched off so as to cut off the power of the heating sheet.
In this embodiment, the battery management system can control the heating switch according to the detection value of the second detector, and can avoid the phenomenon that local active substances inside the battery cell are heated greatly and are deactivated due to an excessively high heating rate, so that the battery cell is prevented from bursting, and the reliability of the preheating method for the battery pack device is improved.
And S250, when the temperature of the battery core is greater than or equal to a second preset temperature, powering off the heating sheet and charging the battery pack device.
Please refer to S140 for the detailed step of S250.
In the embodiment of the application, when the heating plate is electrified to heat the electric core, the current flowing through the heating plate is monitored in real time, so that more heat is generated in the unit time of the heating plate, local active substances in the electric core are heated greatly and are inactivated, the electric core is prevented from bursting, and the reliability of the preheating method for the battery pack is improved.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the methods and their core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A battery pack device is characterized by comprising an electric core, a heating sheet, a heating switch, a sensor and a controller, wherein an active substance is arranged in the electric core, and the heating sheet is positioned in the electric core and used for heating the electric core; the heating switch is connected with the heating sheet to control the heating sheet to be powered on or powered off; the sensor is used for detecting the temperature of the battery core, and the controller is coupled with the sensor and the heating switch and is used for controlling the heating switch according to the detection value of the sensor.
2. The battery pack apparatus of claim 1, wherein the heating switch is located inside the battery cell, and the battery cell comprises a negative electrode tab, and the negative electrode tab is connected to the heating plate through the heating switch, so as to heat the heating plate by using the energy of the battery cell itself.
3. The battery pack apparatus of claim 2, wherein the number of the battery cells is plural, the heating plate and the heating switch are disposed inside each of the battery cells, and the controller is coupled to the plural battery cells respectively to control the plural heating switches respectively.
4. A preheating method for a battery pack device is characterized in that the battery pack device comprises a battery core and a heating sheet positioned in the battery core, active substances are arranged in the battery core,
the battery pack preheating method comprises the following steps:
acquiring a charging instruction;
acquiring the temperature of the battery cell;
and when the temperature of the battery cell is less than or equal to a first preset temperature, the heating sheet is electrified and generates heat.
5. The battery pack device preheating method according to claim 4, wherein after energizing and heating the heating sheet, the battery pack device preheating method further comprises:
when the temperature of the battery core is greater than or equal to a second preset temperature, the heating sheet is powered off, and the battery pack device is charged; wherein the second preset temperature is greater than the first preset temperature.
6. The battery pack device preheating method according to claim 5, wherein the step of heating the heating sheet includes:
determining the internal residual electric quantity of the battery pack;
when the residual electric quantity in the battery pack is larger than or equal to the preset electric quantity, the residual electric quantity in the battery pack heats the heating sheet.
7. The battery pack device preheating method according to claim 5, wherein the step of heating the heating sheet includes:
the heating circuit is communicated with a charger, the charger heats the heating sheet, and the charger is used for charging the battery pack device.
8. The battery pack device preheating method according to claim 4, wherein after energizing and heating the heating sheet, the battery pack device preheating method further comprises:
and detecting the current flowing through the heating plate in real time, and controlling the heating plate to be powered off when the current is larger than or equal to the warning current.
9. The battery pack device preheating method according to claim 4, wherein after energizing and heating the heating sheet, the battery pack device preheating method further comprises:
and detecting the temperature rising rate of the battery core in real time, and controlling the heating plate to be powered off when the rate is greater than or equal to the warning rate.
10. The battery pack device preheating method according to any one of claims 4 to 7, wherein before the acquiring the temperature of the battery cells and after the acquiring the charging instruction, the battery pack device preheating method further comprises:
determining that the heating plate is powered off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911235228.8A CN110931918A (en) | 2019-12-05 | 2019-12-05 | Battery pack device and battery pack device preheating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911235228.8A CN110931918A (en) | 2019-12-05 | 2019-12-05 | Battery pack device and battery pack device preheating method |
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| CN110931918A true CN110931918A (en) | 2020-03-27 |
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| CN201911235228.8A Pending CN110931918A (en) | 2019-12-05 | 2019-12-05 | Battery pack device and battery pack device preheating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112151888A (en) * | 2020-09-25 | 2020-12-29 | 上海航天计算机技术研究所 | Carrier rocket lithium battery intelligent management equipment |
| CN113904028A (en) * | 2021-09-29 | 2022-01-07 | 东莞新能安科技有限公司 | Battery module, battery package and consumer |
| CN114614164A (en) * | 2022-04-11 | 2022-06-10 | 中创新航科技股份有限公司 | Control method of heating film and temperature control system of battery pack |
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Application publication date: 20200327 |