CN114184897A - Insulation detection circuit and method, power battery quick charging method and related device - Google Patents
Insulation detection circuit and method, power battery quick charging method and related device Download PDFInfo
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- CN114184897A CN114184897A CN202010966780.0A CN202010966780A CN114184897A CN 114184897 A CN114184897 A CN 114184897A CN 202010966780 A CN202010966780 A CN 202010966780A CN 114184897 A CN114184897 A CN 114184897A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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Abstract
The invention discloses an insulation detection circuit and method, and a power battery quick-charging method and device, wherein the insulation detection circuit comprises an insulation detection module, a heating film and a first high-voltage sampling resistor, the insulation detection module is connected with the anode and the cathode of a power battery, and a connection anode switch is connected between the anode of the power battery and the anode of a quick-charging pile; a negative switch is connected between the negative electrode of the power battery and the negative electrode of the quick charging pile, a pre-charging switch and a pre-charging resistor are connected in parallel at two ends of the positive switch, the pre-charging switch and the pre-charging resistor are connected in series and are connected in parallel at two ends of the positive switch, and a first high-voltage sampling resistor is connected in parallel at two ends of the negative switch; the heating film and the heating film switch are connected in series between two ends of the power battery connected with the quick charging pile; on the basis of the traditional power battery electrical framework, the invention realizes the insulation detection of the heating film before high voltage is applied by reasonably utilizing the high-voltage sampling circuit and the pre-charging circuit, thereby increasing the safety.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to an insulation detection circuit and method, a power battery quick charging method and a related device.
Background
In a new energy vehicle, a battery management system is provided with an insulation detection loop, and the insulation detection loop can detect the insulation resistance of a power battery in real time in an activated state so as to judge whether the insulation of the power battery meets safety standards. Namely, after the battery management system controls the main relay to be closed and establishes high voltage on the whole vehicle, because the high-voltage loop of the whole vehicle is conducted, the insulation detection loop of the battery management system can synchronously detect the insulation resistance of the whole vehicle so as to judge whether the whole vehicle has insulation faults or not, thereby ensuring the safety of a power battery and the vehicle.
When the ambient temperature that power battery was located is lower, before the utilization was filled electric pile and is carried out quick charge, need preheat power battery through highly compressed heating film to promote battery low temperature performance. And because the electric current of filling electric pile is high voltage current, before carrying out quick charge, need carry out insulation detection to whole power battery including heating film to the security of guaranteeing to charge.
However, in the conventional detection circuit, the heating film is located outside the battery relay in the battery electrical architecture, and the heating film cannot be covered when the insulation detection is performed on the whole power battery.
Disclosure of Invention
The invention provides an insulation detection circuit and method, a power battery quick charging method and a related device, and aims to solve the problem that potential safety hazards are caused due to the fact that insulation detection cannot be performed on a heating film before high voltage is applied in the prior art.
An insulation detection circuit comprising:
the two ends of the insulation detection module are respectively connected with the anode and the cathode of the power battery;
the circuit switch comprises an anode switch, a cathode switch, a pre-charging switch and a heating film switch, the anode of the power battery is connected with the anode of the quick charging pile through the connecting anode switch, and the cathode of the power battery is connected with the cathode of the quick charging pile through the cathode switch;
the resistor comprises a pre-charging resistor and a first high-voltage sampling resistor, the pre-charging switch and the pre-charging resistor are connected to two ends of the positive switch in parallel, the pre-charging switch and the pre-charging resistor are connected in series and connected to two ends of the positive switch in parallel, and the first high-voltage sampling resistor is connected to two ends of the negative switch in parallel;
and the heating film switch are connected in series between the two ends of the power battery connected with the quick charging pile.
Further, the insulation detection circuit further comprises a second high-voltage sampling resistor and a third high-voltage sampling resistor, the second high-voltage sampling resistor is connected in parallel to the two ends of the insulation detection module, and the third high-voltage sampling resistor is connected in series between the pre-charging resistor and the negative electrode of the power battery.
Further, the first high-voltage sampling resistor, the second high-voltage sampling resistor and the third high-voltage sampling resistor are all larger than a preset resistance value.
An insulation detection method of a power battery is applied to the insulation detection circuit, and the method comprises the following steps:
when a quick charging gun inserting signal of the quick charging pile is detected, the positive switch, the negative switch and the heating film switch in the insulation detection circuit are controlled to be switched off, and the pre-charging switch is controlled to be switched on;
controlling an insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain an insulation resistance value of a heating film in the insulation detection circuit;
determining whether the heating film has an insulation fault according to the insulation resistance value of the heating film;
and if the heating film is determined to have insulation fault, carrying out insulation fault prompt.
Further, after determining whether an insulation fault occurs in the heating film according to an insulation resistance value of the heating film, the method further includes:
and if the heating film is determined not to have the insulation fault, stopping the insulation detection of the heating film.
An insulation detection device comprising:
the control module is used for controlling the positive switch, the negative switch and the heating film switch in the insulation detection circuit to be switched off and controlling the pre-charging switch to be switched on when a quick charging gun inserting signal of the quick charging pile is detected;
the detection module is used for controlling the insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain the insulation resistance value of a heating film in the insulation detection circuit;
the determining module is used for determining whether the heating film has insulation fault according to the insulation resistance value of the heating film;
and the prompting module is used for prompting the fault of the heating film if the heating film is determined to have the insulation fault.
A power battery quick charging method is applied to the insulation detection circuit and comprises the following steps:
when a quick charging gun inserting signal of the quick charging pile is detected, the insulation detection circuit is controlled to perform insulation detection on the power battery and the heating film so as to obtain an insulation detection result;
judging whether the power battery and the heating film have faults or not according to the insulation detection result;
if the power battery and the heating film are determined not to be in fault, controlling the heating film to preheat the power battery;
and after the preheating is finished, controlling the power battery to enter a quick charging process.
Further, after the preheating is finished, controlling the power battery to enter a rapid charging process includes:
in the preheating process, acquiring the temperature of the power battery in real time;
determining whether the temperature of the power battery meets the temperature requirement of the rapid charging;
if the temperature of the power battery is determined to meet the temperature requirement of the rapid charging, determining that the preheating is finished;
and controlling the power battery to enter the quick charging process.
Further, after the insulation detection circuit is judged to have a fault according to the insulation detection result, the method further includes:
and if the power battery or the heating film is determined to be in fault, fault prompt is carried out.
A power battery quick charging device comprises:
the insulation detection module is used for controlling the insulation detection circuit to perform insulation detection on the power battery and the heating film when a quick charging gun inserting signal of the quick charging pile is detected, so as to obtain an insulation detection result;
the judging module is used for judging whether the power battery and the heating film have faults or not according to the insulation detection result;
the preheating module is used for controlling the heating film to preheat the power battery if the power battery and the heating film are determined not to be in fault;
and the quick charging module is used for controlling the power battery to enter a quick charging process after the preheating is finished.
A readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the insulation detection method or the power battery quick-charging step described above.
In the scheme provided by the insulation detection circuit and method, the power battery quick charging method and the related device, in the invention, because the two ends of the positive switch are connected in parallel with the pre-charging switch and the pre-charging resistor, and the two ends of the negative switch are connected in parallel with the first high-voltage sampling resistor, when the quick charging gun of the charging pile is inserted into the gun, the circuit between the power battery and the quick charging pile is in a low-voltage communication state by keeping the positive switch, the negative switch and the heating film switch disconnected and closing the pre-charging switch, and the positive voltage of the power battery is conducted to one end of the heating film through the pre-charging switch at the moment, so that the heating film becomes a common load, the existing insulation detection module can be utilized for insulation detection, namely, on the traditional electrical architecture of the power battery, the insulation detection of the heating film before high voltage is realized through reasonably utilizing the high-voltage sampling circuit and the pre-charging circuit, the safety is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a circuit diagram of an insulation detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an insulation detection method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an insulation detecting apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a method for quickly charging a power battery according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power battery quick charging device according to an embodiment of the invention;
fig. 6 is another schematic structural diagram of a power battery quick charging device according to an embodiment of the invention.
Wherein, in the figures, the respective reference numerals:
a-a power cell; b, quickly charging a charging pile; c-heating the film; d, an insulation detection module; e-vehicle body ground;
k1 — positive switch (positive relay); k2-precharge switch (precharge relay); k3-negative switch (negative relay); k4-heating membrane switch (heating membrane relay);
r1-precharge resistor; r2 — first high voltage sampling resistor; r3-second high voltage sampling resistor; r4 — third high voltage sampling resistor; r5-insulation resistance of the heating film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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.
Example one
Referring to fig. 1, the insulation detection circuit provided by the present invention will now be described.
The present embodiment provides an insulation detection circuit, which includes an insulation detection module D, a circuit switch, a resistor, and a heating film C. Two ends of the insulation detection module D are respectively connected to the positive electrode and the negative electrode of the power battery A; the circuit switch comprises an anode switch K1, a cathode switch K3, a pre-charging switch K2 and a heating film switch K4, a connecting anode switch K1 is connected between the anode of the power battery A and the anode of the quick-charging pile B, and a cathode switch K3 is connected between the cathode of the power battery A and the cathode of the quick-charging pile B; the resistor comprises a pre-charging resistor R1 and a first high-voltage sampling resistor R2, two ends of an anode switch K1 are connected with a pre-charging switch K2 and a pre-charging resistor R1 in parallel, the pre-charging switch K2 and the pre-charging resistor R1 are connected in series and then connected in parallel with two ends of an anode switch K1, and the first high-voltage sampling resistor R2 is connected in parallel with two ends of a cathode switch K3; and the heating film C and the heating film switch K4 are connected in series between two ends of the power battery A connected with the quick charging pile B, wherein the heating film C is connected with the vehicle body ground E.
The circuit switch in the insulation detection circuit can be a relay to ensure the safety of each load on the insulation detection circuit. In the present embodiment, the circuit switches in the insulation detection circuit are taken as relays for explanation, that is, the positive electrode switch K1, the negative electrode switch K3, the precharge switch K2, and the heating film switch K4 are respectively a positive electrode relay K1, a negative electrode relay K3, a precharge relay K2, and a heating film relay K4.
Because the two ends of the positive switch K1 are connected in parallel with the pre-charging switch K2 and the pre-charging resistor R1, and the two ends of the negative switch K3 are connected in parallel with the first high-voltage sampling resistor R2, when the quick charging gun of the quick charging pile B is inserted, the positive switch K1, the negative switch K3 and the heating film switch K4 are kept disconnected, and the pre-charging switch K2 is closed, because the power battery A and the quick charging pile B are communicated through the first high-voltage sampling resistor R2, the current is extremely small, so that the circuit between the power battery A and the quick charging pile B is in a low-voltage communication state, at the moment, the positive voltage of the power battery A is conducted to one end of the heating film through the pre-charging switch K2, so that the heating film becomes a common load, the ready-made insulation detection module D can be used for insulation detection of the heating film C, so as to obtain the insulation resistor R5 of the heating film, namely, in the traditional power battery electrical architecture, by reasonably utilizing the high-voltage sampling circuit and the pre-charging circuit, the insulation detection of the heating film C before the high-voltage is realized, and the safety of the heating film C is improved.
In addition, the insulation detection circuit in the embodiment can perform insulation detection when the high-voltage loop is not completely closed, the insulation detection of the heating film C can be realized without increasing extra cost, and the cost of the insulation detection is controlled on the basis of expanding the range of the insulation detection and improving the safety of the power battery A and the vehicle.
In an embodiment, as shown in fig. 1, the insulation detection circuit further includes a second high-voltage sampling resistor R3 and a third high-voltage sampling resistor R4, the second high-voltage sampling resistor R3 is connected in parallel to both ends of the insulation detection module D, and the third high-voltage sampling resistor R4 is connected in series between the pre-charge resistor R1 and the negative electrode of the power battery a, that is, the pre-charge switch K2, the pre-charge resistor R1, and the third high-voltage sampling resistor R4 are connected in series between the positive electrode and the negative electrode of the power battery a. Through increasing second high pressure sampling resistance R3 and third high pressure sampling resistance R4, when carrying out insulation detection to heating film C, can carry out insulation detection to power battery A's whole high-voltage loop and pre-charge circuit, improved insulation detection's efficiency, further guaranteed the security of power battery A and vehicle.
In an embodiment, the first high voltage sampling resistor R2, the second high voltage sampling resistor R3 and the third high voltage sampling resistor R4 are all larger than a preset resistance value, so as to ensure that the current in the insulation detection circuit is extremely small, and further ensure the safety of the power battery and the vehicle. For example, the first high voltage sampling resistor R2, the second high voltage sampling resistor R3, and the third high voltage sampling resistor R4 are all 3M ohm high voltage sampling resistors.
In this embodiment, the first high-voltage sampling resistor R2, the second high-voltage sampling resistor R3, and the third high-voltage sampling resistor R4 are all 3M ohm high-voltage sampling resistors, which are only exemplified, and in other embodiments, the first high-voltage sampling resistor R2, the second high-voltage sampling resistor R3, and the third high-voltage sampling resistor R4 may also be high-voltage sampling resistors with other resistances, which is not described herein again.
Example two
In one embodiment, as shown in fig. 2, an insulation detecting method applied to the insulation detecting circuit in fig. 1 is provided, which includes the following steps:
s01: when a quick charging gun inserting signal of the quick charging pile is detected, the positive switch, the negative switch and the heating film switch in the insulation detection circuit are controlled to be switched off, and the pre-charging switch is controlled to be switched on.
In this embodiment, a positive electrode switch, a negative electrode switch, a precharge switch, and a heating film switch in the insulation detection circuit are respectively a positive electrode relay, a negative electrode relay, a precharge relay, and a heating film relay, which are taken as examples.
When the power battery of vehicle is charged by the quick charging pile, the quick charging gun of the quick charging pile is required to be inserted into the vehicle, when a quick charging gun inserting signal of the quick charging pile is detected, a Battery Management System (BMS) of the vehicle is awakened, the awakened BMS enters a quick charging preparation mode of the power battery, the high voltage of the power battery is temporarily not applied, and the insulation detection circuit is used for carrying out insulation detection on the heating film so as to ensure the safety of the power battery and the vehicle. When detecting the quick rifle of filling soon and inserting the rifle signal of filling soon promptly, positive relay, negative pole relay and the heating film relay disconnection among the insulating detection circuit are controlled earlier to control the pre-charge relay closed, the circuit between power battery and the quick electric pile of filling is in the low pressure connected state this moment, and power battery's positive pole voltage passes through the pre-charge switch conduction to heating film one end, makes the heating film become a ordinary load, can utilize ready-made insulating detection module to carry out insulation detection.
S02: and controlling an insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain the insulation resistance value of the heating film in the insulation detection circuit.
After the positive switch, the negative switch and the heating film switch in the insulation detection circuit are controlled to be switched off and the pre-charging switch is controlled to be switched on, the insulation detection circuit is controlled to be in a low-voltage connection state, and at the moment, the insulation detection module in the insulation detection circuit can be controlled to perform insulation detection so as to obtain the insulation resistance value of the heating film in the insulation detection circuit.
S03: and determining whether the heating film has an insulation fault according to the insulation resistance value of the heating film.
After the insulation resistance value of the heating film in the insulation detection circuit is obtained, whether the insulation fault occurs in the heating film is determined according to the insulation resistance value of the heating film.
For example, if the insulation resistance value of the heating film is less than a preset value, it indicates that an insulation fault occurs in the heating film; if the insulation resistance value of the heating film is not less than the preset value, it indicates that no insulation fault occurs in the heating film. In this embodiment, the insulation resistance of the heating film is directly determined by the insulation detection module, and the preset value is a predetermined resistance of the heating film in a good state.
S04: and if the heating film is determined to have insulation fault, carrying out insulation fault prompt.
After whether the heating film has the insulation fault or not is determined according to the insulation resistance value of the heating film, if the heating film has the insulation fault, insulation fault prompting is performed, so that a user can quickly know the insulation condition of the heating film, corresponding processing is performed, and the safety of a vehicle is improved.
S05: and if the heating film is determined not to have the insulation fault, stopping the insulation detection of the heating film.
After whether the heating film has insulation fault is determined according to the insulation resistance value of the heating film, if the heating film is determined not to have insulation fault, the heating film of the power battery is normal, at the moment, insulation detection on the heating film is stopped, and the heating film is controlled to perform a normal preheating flow on a power battery model so as to improve the temperature of the power battery, so that the safety and the performance of the power battery in a low-temperature environment are ensured.
In this embodiment, when detecting the rifle signal of inserting of the quick rifle that fills of filling electric pile soon, positive pole switch, negative pole switch and heating film switch among the control insulation detection circuit break off, and control the closing of pre-charge switch, then control the insulation detection module among the insulation detection circuit and carry out insulation detection, in order to obtain the insulation resistance of heating film among the insulation detection circuit, and then confirm whether insulation fault takes place for the heating film according to the insulation resistance of heating film, if confirm that insulation fault takes place for the heating film, then carry out insulation fault suggestion, if confirm that insulation fault does not take place for the heating film, stop the insulation detection to the heating film, through carrying out insulation detection to the heating film when detecting the rifle signal of inserting of the quick rifle that fills electric pile soon, the security of power battery and vehicle in the follow-up charging process has been guaranteed.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In an embodiment, an insulation detection device is provided, and the insulation detection device corresponds to the insulation detection method in the above embodiments one to one. As shown in fig. 3, the insulation detecting apparatus includes a control module 301, a detecting module 302, a determining module 303, and a prompting module 304. The functional modules are explained in detail as follows:
the control module 301 is configured to control the positive switch, the negative switch and the heating film switch in the insulation detection circuit to be turned off and the pre-charging switch to be turned on when a quick charging gun insertion signal of the quick charging pile is detected;
the detection module 302 is used for controlling an insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain an insulation resistance value of a heating film in the insulation detection circuit;
a determining module 303, configured to determine whether an insulation fault occurs in the heating film according to an insulation resistance value of the heating film;
and the prompting module 304 is configured to prompt a fault of the heating film if it is determined that the heating film has an insulation fault.
Further, after determining whether the heating film has an insulation fault according to the insulation resistance value of the heating film, the detection module 302 is further specifically configured to;
and if the heating film is determined not to have the insulation fault, stopping the insulation detection of the heating film.
For specific limitations of the insulation detection device, reference may be made to the above limitations of the insulation detection method, which are not described herein again. The modules in the insulation detection device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the insulation detection device, and can also be stored in a memory in the insulation detection device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, an insulation detection apparatus is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps of the insulation detection method when executing the computer program.
In an embodiment, a readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the insulation detection method described above.
EXAMPLE III
In an embodiment, as shown in fig. 4, a power battery quick charging method is provided, where the power battery insulation detection method is applied to the insulation detection circuit, and the method includes:
s10: when detecting the quick rifle of filling soon and inserting the rifle signal, control insulating detection circuitry carries out insulating detection to power battery and heating film to obtain insulating testing result.
When a quick charging gun inserting signal of a quick charging pile is detected, a Battery Management System (BMS) of the whole vehicle is awakened, the awakened BMS enters a power battery quick charging preparation mode, the high voltage electricity of the power battery is not temporarily applied, the positive relay, the negative relay and the heating film relay in the insulation detection circuit are firstly controlled to be disconnected, the pre-charging relay is controlled to be closed, the circuit between the power battery and the quick charging pile is in a low-voltage connection state instead of a high-voltage connection state, the positive voltage of the power battery is conducted to one end of the heating film through the pre-charging switch, so that the heating film becomes a common load, the power battery and the heating film in the insulation detection circuit can be subjected to insulation detection by using a ready insulation detection module, and an insulation detection result is obtained, so that whether quick charging is carried out or not is judged according to the insulation detection result, thereby ensuring the safety of the power battery and the vehicle.
S20: and judging whether the heating film of the insulation detection circuit has a fault according to the insulation detection result.
After the insulation detection result is obtained, whether the heating film of the insulation detection circuit is faulty or not is judged according to the insulation detection result. If the insulation detection module in the insulation detection circuit detects that the insulation resistance value of the power battery or the heating film is abnormal, it is determined that the power battery or the heating film fails, and if the insulation detection module detects that the insulation resistance value of the power battery or the heating film is abnormal, it is determined that the power battery and the heating film do not fail.
S30: and if the power battery and the heating film are determined not to be in fault, controlling the heating film to preheat the power battery.
After judging whether insulating detection circuitry's heating film is broken down according to insulating testing result, if confirm power battery and heating film not broken down, then control heating film relay closure for the high tension electricity in the electric pile that fills soon flows into the heating film through heating film relay, preheats power battery, controls the heating film promptly and preheats power battery, guarantees the performance of power battery in low temperature environment.
S40: and after preheating is finished, controlling the power battery to enter a quick charging process.
The control heating film preheats power battery and after preheating, positive relay, negative pole relay among the control insulation detection circuit are closed to control prediction relay and heating film relay disconnection, make the high tension electricity in the electric pile of filling that fills soon flow into power battery through positive relay, negative pole relay, control power battery promptly and get into the quick charge flow, in order to accomplish the electric pile of filling that fills soon and to fill the charging of power battery.
In the embodiment, when the quick charging gun inserting signal of the quick charging pile is detected, the insulation detection circuit is controlled to carry out insulation detection on the power battery and the heating film so as to obtain an insulation detection result, then judging whether the heating film of the insulation detection circuit is in fault according to the insulation detection result, if the power battery and the heating film are determined not to be in fault, controlling the heating film to preheat the power battery, after preheating is finished, the power battery is controlled to enter a quick charging process, the insulation detection circuit is fully utilized to carry out insulation detection on the power battery and the heating film, under the condition that the insulativity of the power battery is good and the insulativity of the heating film is good, the heating film is controlled to preheat the power battery and then enter a quick charging process, the performance of the power battery in a low-temperature environment is improved, the safety and the quick charging of the power battery are realized, and the safety of a vehicle is further ensured.
In an embodiment, after step S20, namely after determining whether the heating film of the insulation detection circuit is faulty according to the insulation detection result, the method further includes:
s50: and if the power battery or the heating film is determined to be in fault, fault prompt is carried out.
After judging whether the heating film of the insulation detection circuit breaks down or not according to the insulation detection result, if the power battery or the heating film is determined to break down, corresponding fault prompt is carried out so that a user can timely know the fault condition of the power battery or the heating film, the safety problem caused when the power battery or the heating film is subsequently connected with high voltage electricity is avoided, and the safety of the power battery and a vehicle is further ensured.
In an embodiment, in step S40, that is, after the preheating is finished, the method for controlling the power battery to enter the fast charging process includes the following steps:
s41: and in the preheating process, the temperature of the power battery is acquired in real time.
After the heating film is controlled to preheat the power battery, the temperature of the power battery is acquired in real time in the preheating process, so that whether the power battery enters a quick charging process is determined in real time according to the temperature of the power battery, and the charging efficiency of the power battery is improved.
S42: it is determined whether the temperature of the power battery meets the temperature requirement for rapid charging.
And after the temperature of the power battery is obtained in real time, whether the temperature of the power battery meets the temperature requirement of quick charging or not is judged.
Wherein, whether the temperature of the power battery meets the temperature requirement of the quick charge is determined by determining whether the temperature of the power battery is in the temperature range of the quick charge which allows the quick charge. If the temperature of the power battery is determined to be in the temperature range allowing quick charging, the temperature of the power battery is determined to meet the temperature requirement of quick charging, and if the temperature of the power battery is determined to be lower than the temperature range allowing quick charging, the temperature of the power battery is determined not to meet the temperature requirement of quick charging, and the heating film needs to be continuously controlled to preheat the power battery so that the temperature of the power battery reaches the temperature range allowing quick charging.
S43: and if the temperature of the power battery is determined to meet the temperature requirement of quick charging, determining that the preheating is finished.
After determining whether the temperature of the power battery meets the temperature requirement of the rapid charging, if the temperature of the power battery meets the temperature requirement of the rapid charging, determining that the preheating is finished, and controlling the heating film relay to be switched off at the moment so as to control the heating film to stop preheating the power battery.
S44: and controlling the power battery to enter a quick charging process.
After the preheating is determined to be finished, the power battery is controlled to enter a quick charging process, namely, the heating film relay and the pre-charging relay are controlled to be disconnected, and the anode relay and the cathode relay are controlled to be closed, so that the high-voltage current of the quick-charging pile enters the power battery, and the quick charging of the power battery is quickly completed.
In this embodiment, after control heating membrane preheats power battery, through the temperature that acquires power battery in real time at the in-process that preheats, and confirm whether power battery's temperature satisfies quick charge's temperature demand, if confirm that power battery's temperature satisfies quick charge's temperature demand, confirm to preheat and end, control power battery gets into the quick charge flow, the step of controlling power battery to get into the quick charge flow after preheating the end has been refined, confirm whether to get into the quick charge flow according to power battery's temperature in real time, on the basis of guaranteeing power battery low temperature performance, power battery's charge efficiency has been improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In an embodiment, a power battery quick charging device is further provided, and the insulation detection device corresponds to the insulation detection method in the embodiment one to one. As shown in fig. 5, the insulation detecting apparatus includes an insulation detecting module 501, a determining module 502, a preheating module 5033, and a fast charging module 504. The functional modules are explained in detail as follows:
the insulation detection module 501 is configured to control the insulation detection circuit to perform insulation detection on the power battery and the heating film when detecting a quick charging gun insertion signal of the quick charging pile so as to obtain an insulation detection result;
a judging module 502, configured to judge whether the power battery and the heating film are faulty according to the insulation detection result;
the preheating module 503 is configured to control the heating film to preheat the power battery module if it is determined that the power battery and the heating film are not faulty;
and the quick charging module 504 is used for controlling the power battery to enter a quick charging process after the preheating is finished.
Further, the power battery quick charging device further includes a fault prompting module 505, and after determining whether the insulation detection circuit has a fault according to the insulation detection result, the fault prompting module 505 is specifically configured to:
and if the power battery or the heating film is determined to be in fault, fault prompt is carried out.
Further, the preheating module 503 is specifically configured to:
in the preheating process, acquiring the temperature of the power battery in real time;
determining whether the temperature of the power battery meets the temperature requirement of the rapid charging;
if the temperature of the power battery is determined to meet the temperature requirement of the rapid charging, determining that the preheating is finished;
and controlling the power battery to enter the quick charging process.
For specific limitations of the power battery quick charging device, reference may be made to the above limitations of the power battery quick charging method, and details are not described here. The modules in the power battery quick charging device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or a processor independent of the insulation detection device, and can also be stored in a memory of the insulation detection device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 6, a power battery quick-charging device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the steps of the power battery quick-charging method are implemented.
In one embodiment, a readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the steps of the power battery fast charging method described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An insulation detection circuit, comprising:
the two ends of the insulation detection module are respectively connected with the anode and the cathode of the power battery;
the circuit switch comprises an anode switch, a cathode switch, a pre-charging switch and a heating film switch, the anode of the power battery is connected with the anode of the quick charging pile through the connecting anode switch, and the cathode of the power battery is connected with the cathode of the quick charging pile through the cathode switch;
the resistor comprises a pre-charging resistor and a first high-voltage sampling resistor, the pre-charging switch and the pre-charging resistor are connected to two ends of the positive switch in parallel, the pre-charging switch and the pre-charging resistor are connected in series and connected to two ends of the positive switch in parallel, and the first high-voltage sampling resistor is connected to two ends of the negative switch in parallel;
and the heating film switch are connected in series between the two ends of the power battery connected with the quick charging pile.
2. The insulation detection circuit of claim 1, further comprising a second high voltage sampling resistor connected in parallel across the insulation detection module and a third high voltage sampling resistor connected in series between the pre-charge resistor and the negative pole of the power cell.
3. The insulation detection circuit of claim 2, wherein the first high voltage sampling resistor, the second high voltage sampling resistor, and the third high voltage sampling resistor are each greater than a predetermined resistance value.
4. An insulation detection method, characterized in that the insulation detection method of the power battery is applied to the insulation detection circuit according to any one of claims 1-3, and the method comprises the following steps:
when a quick charging gun inserting signal of the quick charging pile is detected, the positive switch, the negative switch and the heating film switch in the insulation detection circuit are controlled to be switched off, and the pre-charging switch is controlled to be switched on;
controlling an insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain an insulation resistance value of a heating film in the insulation detection circuit;
determining whether the heating film has an insulation fault according to the insulation resistance value of the heating film;
and if the heating film is determined to have insulation fault, carrying out insulation fault prompt.
5. The insulation detecting method according to claim 4, wherein after determining whether the insulation failure has occurred in the heating film based on the insulation resistance value of the heating film, the method further comprises:
and if the heating film is determined not to have the insulation fault, stopping the insulation detection of the heating film.
6. An insulation detection device, comprising:
the control module is used for controlling the positive switch, the negative switch and the heating film switch in the insulation detection circuit to be switched off and controlling the pre-charging switch to be switched on when a quick charging gun inserting signal of the quick charging pile is detected;
the detection module is used for controlling the insulation detection module in the insulation detection circuit to perform insulation detection so as to obtain the insulation resistance value of a heating film in the insulation detection circuit;
the determining module is used for determining whether the heating film has insulation fault according to the insulation resistance value of the heating film;
and the prompting module is used for prompting the fault of the heating film if the heating film is determined to have the insulation fault.
7. A power battery quick charging method, wherein the power battery insulation detection method is applied to the insulation detection circuit according to any one of claims 1 to 3, and the method comprises the following steps:
when a quick charging gun inserting signal of the quick charging pile is detected, the insulation detection circuit is controlled to perform insulation detection on the power battery and the heating film so as to obtain an insulation detection result;
judging whether the power battery and the heating film have faults or not according to the insulation detection result;
if the power battery and the heating film are determined not to be in fault, controlling the heating film to preheat the power battery;
and after the preheating is finished, controlling the power battery to enter a quick charging process.
8. The method for rapidly charging the power battery according to claim 7, wherein after the preheating is finished, the controlling the power battery to enter a rapid charging process comprises:
in the preheating process, acquiring the temperature of the power battery in real time;
determining whether the temperature of the power battery meets the temperature requirement of the rapid charging;
if the temperature of the power battery is determined to meet the temperature requirement of the rapid charging, determining that the preheating is finished;
and controlling the power battery to enter the quick charging process.
9. The quick charging method for the power battery according to claim 7, wherein after the insulation detection result is used for judging whether the insulation detection circuit has a fault, the method further comprises the following steps:
and if the power battery or the heating film is determined to be in fault, fault prompt is carried out.
10. The utility model provides a power battery fills device soon which characterized in that includes:
the insulation detection module is used for controlling the insulation detection circuit to perform insulation detection on the power battery and the heating film when a quick charging gun inserting signal of the quick charging pile is detected, so as to obtain an insulation detection result;
the judging module is used for judging whether the power battery and the heating film have faults or not according to the insulation detection result;
the preheating module is used for controlling the heating film to preheat the power battery if the power battery and the heating film are determined not to be in fault;
and the quick charging module is used for controlling the power battery to enter a quick charging process after the preheating is finished.
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