CN114236400A - Power battery detection method and system and vehicle - Google Patents
Power battery detection method and system and vehicle Download PDFInfo
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- CN114236400A CN114236400A CN202111556716.6A CN202111556716A CN114236400A CN 114236400 A CN114236400 A CN 114236400A CN 202111556716 A CN202111556716 A CN 202111556716A CN 114236400 A CN114236400 A CN 114236400A
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- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
Abstract
The invention discloses a power battery detection method, a power battery detection system and a vehicle, which are applied to a battery management module in a power battery system, wherein the battery management module is connected with a whole vehicle controller, the power battery system further comprises a first battery cell group, a second battery cell group, a first relay, a second relay, a third relay, a positive relay and a negative relay, and the method comprises the following steps: if a high-low voltage platform switching signal sent by the vehicle controller is received, detecting the adhesion state of the first relay, the second relay and the third relay; if the positive relay and the negative relay are not adhered, respectively detecting the adhesion states of the positive relay and the negative relay when a power-on instruction or a charging instruction sent by the vehicle control unit is received; and if the positive relay and/or the negative relay are adhered, an alarm and a state detection report are sent to a user. The method can rapidly judge the relay with the adhesion problem in the power battery system with higher efficiency, thereby being beneficial to ensuring the safety of the vehicle.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery detection method, a power battery detection system and a vehicle.
Background
With the vigorous development of new energy automobiles in this year, the electric vehicle replaces a fuel vehicle, which is a popular topic in recent years, and with the continuous bright phase of a 1000km endurance vehicle, the endurance anxiety problem is relieved to a certain extent. However, the problems of slow charging and difficult charging always restrict the further development of the electric vehicle. To solve this problem, a high voltage platform technology is developed, which increases the charging power to shorten the charging time by increasing the voltage platform. The voltage rise tests on components increase, and the problem of relay adhesion also becomes a common quality problem of the battery system.
Disclosure of Invention
The embodiment of the application provides a power battery detection method, a power battery detection system and a vehicle, and the method can be used for rapidly judging the relay with the adhesion problem in the power battery system with higher efficiency, so that the safety of the power battery is ensured, and the safety of the vehicle is favorably ensured.
In a first aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
the utility model provides a power battery detection method, be applied to the battery management module in power battery system, battery management module is connected with vehicle control unit, power battery system still includes first electric core group, second electric core group, parallelly connected first relay at first electric core group both ends, the second relay of establishing ties between first electric core group and second electric core group, the third relay of parallelly connected at second electric core group both ends, connect the positive pole relay between first electric core group and the positive interface of voltage charging and connect the negative pole relay between second electric core group and the negative interface of voltage charging, the method includes: if a high-low voltage platform switching signal sent by the vehicle controller is received, detecting the adhesion state of the first relay, the second relay and the third relay; if the positive relay and the negative relay are not adhered, respectively detecting the adhesion states of the positive relay and the negative relay when a power-on instruction or a charging instruction sent by the vehicle control unit is received; and if the positive relay and/or the negative relay are adhered, an alarm and a state detection report are sent to a user.
Preferably, power battery system still includes the relay that discharges, and the relay that discharges connects in parallel at the both ends of the positive negative pole interface of voltage charging detects the adhesion state of positive pole relay, includes: controlling the second relay to be closed, and disconnecting the first relay, the third relay, the positive relay and the negative relay; controlling the discharging relay to be closed, discharging capacitive loads in the power battery system, and controlling the discharging relay to be disconnected after discharging is finished; and detecting whether the voltage between the second detection point and the third detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the positive relay is in an adhesion state, wherein the second detection point is positioned between the negative relay and the first electric core group, and the third detection point is positioned between the positive relay and the discharging relay.
Preferably, power battery system still includes the relay that discharges, and the relay that discharges connects in parallel at the both ends of the positive negative pole interface of voltage charging detects the adhesion state of negative pole relay, includes: controlling the second relay to be closed, and disconnecting the first relay, the third relay and the cathode relay; controlling the closing of the discharging relay to discharge capacitive loads in the power battery system; and detecting whether the voltage between the first detection point and the fourth detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the negative relay is in an adhesion state, wherein the first detection point is positioned between the positive relay and the second electric core group, and the fourth detection point is positioned between the negative relay and the discharging relay.
Preferably, the detecting the stuck state of the first relay, the second relay, and the third relay includes: controlling the first relay to be disconnected, detecting whether the voltage between the second detection point and the fifth detection point is zero, and if so, determining that the first relay is in an adhesion state; controlling the second relay to be disconnected, detecting whether the voltage between the fifth detection point and the sixth detection point is zero, and if so, determining that the second relay is in an adhesion state; and controlling the first relay and the third relay to be disconnected, detecting whether the voltage between the first detection point and the second detection point is equal to the voltage of the first electric core group, and if so, determining that the third relay is in an adhesion state. The fifth detection point is positioned between the second relay and the first electric core group, and the sixth detection point is positioned between the second relay and the second electric core group.
Preferably, the power battery system further comprises a pre-charging relay connected in parallel to two ends of the positive relay, and the method further comprises: and if the high-low voltage platform switching signal sent by the vehicle controller is not received and the high-voltage electrifying instruction sent by the vehicle controller is received, detecting whether the second relay, the pre-charging relay, the positive relay and the negative relay are in an adhesion state.
Preferably, the power battery system further comprises a charging relay, the charging relay is located between the positive relay and the voltage charging positive interface, and the method further comprises: if a high-low voltage platform switching signal sent by the vehicle controller is not received and a high-voltage charging instruction sent by the vehicle controller is received, whether a second relay, a pre-charging relay, a positive relay, a negative relay and a charging relay are in an adhesion state is detected; the detection process of the charging relay comprises the following steps: the second relay and the positive relay are controlled to be closed, and the pre-charging relay is switched off; controlling the discharging relay to be closed, discharging capacitive loads in the power battery system, controlling the discharging relay to be disconnected after discharging is finished, detecting whether the voltage between the seventh detection point and the second detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the charging relay is adhered; and the seventh detection point is positioned between the charging relay and the voltage charging positive electrode interface.
Preferably, the method further comprises: and if the high-low voltage platform switching signal sent by the vehicle controller is not received and the low-voltage power-on instruction sent by the vehicle controller is received, detecting the adhesion state of the first relay, the third relay, the pre-charging relay, the positive relay and the negative relay.
Preferably, the method further comprises: and if the high-low voltage platform switching signal sent by the vehicle control unit is not received and the low-voltage charging instruction sent by the vehicle control unit is received, detecting the adhesion state of the first relay, the third relay, the pre-charging relay, the positive relay, the negative relay and the charging relay.
In a second aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
a power battery system, comprising: the power battery system further comprises a first battery cell group, a second battery cell group, first relays connected to two ends of the first battery cell group in parallel, second relays connected between the first battery cell group and the second battery cell group in series, third relays connected to two ends of the second battery cell group in parallel, positive relays connected between the second battery cell group and a voltage charging positive electrode interface, and negative relays connected between the first battery cell group and a voltage charging negative electrode interface, and the battery management module realizes the power battery detection method of any one of the first aspect.
In a third aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
a vehicle, comprising: a vehicle body and a power battery system as described in the foregoing second aspect.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the embodiment of the invention provides a power battery detection method, a power battery detection system and a vehicle, which are applied to a battery management module in a power battery system, wherein the method comprises the following steps: if receive the high-low voltage platform switching signal that vehicle control unit sent, then detect the adhesion state of first relay, second relay and third relay for first battery cell group and second battery cell group can be closed at the second relay in power battery system, and when first relay and third relay disconnection, successfully switch into the high-voltage platform with power battery, and are closed at first relay and third relay, when the second relay disconnection, switch into the low-voltage platform with power battery from the high-voltage platform. If it is detected that first relay, second relay and third relay are all not adhered, then when receiving the power-on instruction or the instruction of charging that vehicle control unit sent, detect the adhesion state of anodal relay and negative pole relay respectively, guarantee to be in under the normal condition at anodal relay and negative pole relay, charge or go up the electricity to vehicle power battery for high pressure or low-voltage electric energy enough flow to first electric core group and second electric core group, realize charging. If the adhesion of the positive relay and/or the negative relay is detected, an alarm and a state detection report are sent to a user to remind the user to check, and the use safety of the vehicle is improved. The method can rapidly judge the relay with the adhesion problem in the power battery system with higher efficiency, effectively ensure the safe high voltage of the power battery and prolong the service life of components of the relay.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a power cell system provided by an embodiment of the present invention;
fig. 2 is a flowchart of a power battery detection method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of the adhesion detection of the high-low voltage platform relay according to the embodiment of the present invention;
fig. 4 is a flowchart of the detection before the high voltage platform of the battery system is powered on according to the embodiment of the present invention;
fig. 5 is a flow chart of the detection before charging of the high voltage platform of the battery system according to the embodiment of the present invention;
fig. 6 is a flowchart of the detection before the low voltage platform of the battery system is powered on according to the embodiment of the present invention;
fig. 7 is a flow chart of the detection before charging of the low voltage platform of the battery system according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
The embodiment of the application provides a power battery detection method, a power battery detection system and a vehicle, and the method can be used for rapidly judging the relay with the adhesion problem in the power battery system with higher efficiency, so that the safety of the power battery is ensured, and the safety of the vehicle is favorably ensured.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the utility model provides a power battery detection method, is applied to the battery management module in power battery system, battery management module and vehicle control unit are connected, power battery system still includes first electric core group, second electric core group, parallelly connected first relay at first electric core group both ends, the series connection is in first electric core group and second electric core group between the second relay, parallelly connected the third relay at second electric core group both ends, connect the positive pole relay between first electric core group and the positive interface of voltage charging and connect the negative pole relay between second electric core group and the negative interface of voltage charging, the method includes: if a high-low voltage platform switching signal sent by the vehicle control unit is received, detecting the adhesion state of the first relay, the second relay and the third relay; if the positive relay and the negative relay are not adhered, respectively detecting the adhesion states of the positive relay and the negative relay when a power-on instruction or a charging instruction sent by the whole vehicle controller is received; and if the positive relay and/or the negative relay are adhered, an alarm and a state detection report are sent to a user.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
In a first aspect, an embodiment of the present invention provides a power battery system, where the system includes: the power battery system further comprises a first battery cell group P1, a second battery cell group P2, a first relay K1 connected to two ends of the first battery cell group P1 in parallel, a second relay K2 connected between the first battery cell group P1 and the second battery cell group P2 in series, a third relay K3 connected to two ends of the second battery cell group P2 in parallel, a positive relay K5 connected between the second battery cell group P2 and the voltage charging positive electrode interface, and a negative relay K8 connected between the first battery cell group P1 and the voltage charging negative electrode interface.
In a specific embodiment, the power battery system provided by the application has two working modes, when the first relay K1 and the third relay K3 are opened, the second relay K2 is closed, and the first battery cell group and the second battery cell group are in a series connection state, if the voltages of the first battery cell group and the second battery cell group are equal and are both V, then, the voltage of the battery system is 2V at the moment, and the power battery system is in a high-voltage electric platform. The first electric core group P1 and the second electric core group P2 in the series connection state can supply power to the electric load at a voltage of 2V, and at the moment, the working requirement of the electric load can be met. For example, the voltage V may be 400V, and 2V may be 800V.
The high-voltage platform is used for charging vehicles, and charging can be directly carried out on the charging pile with the power supply voltage reaching 2V, so that the charging efficiency of the battery system is improved.
When the first relay K1 and the third relay K3 are closed, the second relay K2 is disconnected, 2N electric cores connected in series are averagely divided into a first electric core group P1 and a first electric core group P2 which are in parallel, the voltage of a battery system is reduced to V, and the system is in a low-voltage electric platform at the moment and can provide large current for an electric load, so that the system power and the system energy utilization rate are improved.
Wherein, fill electric pile supply voltage with low-voltage platform design for filling with corresponding low pressure and match to make the vehicle can fill on the electric pile that fills of low-voltage platform.
The application provides a battery management module is connected with the control end of each relay in the power battery system, can control the relay, and the sampling point carries out adhesion detection to the relay for battery management module with signal transmission, battery management module according to sampling signal, and when detecting there is the relay adhesion, battery management module can send the police dispatch newspaper to the vehicle, takes notes this trouble simultaneously.
In a second aspect, the embodiment of the present invention provides a power battery detection method applied to a battery management module in a power battery system, specifically, as shown in fig. 2, the method includes the following steps S101 to S103.
Step S101, if a high-low voltage platform switching signal sent by a vehicle controller is received, detecting the adhesion state of a first relay, a second relay and a third relay;
step S102, if the adhesion does not exist, respectively detecting the adhesion states of a positive relay and a negative relay when a power-on instruction or a charging instruction sent by a vehicle controller is received;
and step S103, if the positive relay and/or the negative relay are adhered, an alarm and a state detection report are sent to a user.
In the specific implementation process, when a user actively switches or a vehicle controller automatically switches a high-low voltage platform of a power battery system, the battery management module receives a high-low voltage platform switching signal sent by the vehicle controller, at the moment, the battery management module detects the adhesion states of the first relay, the second relay and the third relay, so that when the first relay, the second relay and the third relay are normal conditions, the high-low voltage platform of the power battery system can be switched, and the service life of a relay component is prolonged.
Specifically, as shown in fig. 3, the relay sticking detection process of the power battery system (switchable voltage platform power battery) may include: whether the current vehicle is in a voltage platform switching state or not is judged firstly, if yes, the adhesion states of the first relay K1, the second relay K2 and the third relay K3 are detected, and if the adhesion states are adhesion, the adhesion states of the positive relay K5 and the negative relay K8 are detected respectively when a power-on instruction or a charging instruction sent by the whole vehicle controller is received.
Specifically, the detecting of the stuck state of the first, second, and third relays K1, K2, and K3 may include: controlling the first relay K1 to be disconnected, detecting whether the voltage between the second detection point VG and the fifth detection point VA is zero, and if so, determining that the first relay K1 is in an adhesion state; controlling the second relay K2 to be switched off, detecting whether the voltage between the fifth detection point VA and the sixth detection point VB is zero, and if so, determining that the second relay K2 is in an adhesion state; and controlling the first relay K1 and the third relay K3 to be switched off, detecting whether the voltage between the first detection point VC and the second detection point VG is equal to the voltage of the first electric core group P1, and if so, determining that the third relay K3 is in a bonding state. The fifth detection point VA is located between the second relay K2 and the first electric core group P1, and the sixth detection point VB is located between the second relay K2 and the second electric core group P2.
Specifically, the adhesion detection mode of the first relay K1 may be as follows: after the battery management module controls the first relay K1 to be disconnected, detecting a voltage VAG between a fifth detection point VA and a second detection point VG at two ends of the first relay K1, and if the voltage VAG is equal to a total voltage VP1 of the first cell group P1 (wherein, the voltage difference value is less than or equal to 5V, the voltage difference value can also be considered to be equal), indicating that the first relay K1 is not adhered; if VAG is equal to 0V, the first relay K1 is stuck.
The adhesion detection mode of the second relay K2 can be as follows: after the battery management module sends a disconnection command to the second relay K2, the battery management module detects a voltage VAB between the fifth detection point VA and the sixth detection point VB, if the voltage VAB is 0V, it indicates that the first relay K1 is in an adhesion state, and if the voltage VAG is not equal to 0V, it indicates that the first relay K1 is not adhered.
The third relay K3 adhesion detection mode can be as follows: after the battery management module controls the first relay K1 and the third relay K3 to be switched off, detecting the voltage VGC between the second detection point VG and the first detection point VC, and if the voltage VGC is equal to the total voltage VP1 of the first cell group P1 (wherein, the voltage difference value is less than or equal to 5V, the voltage difference value can also be considered to be equal), indicating that the third relay K3 is adhered; if the voltage VGC is not equal to the total voltage VP1 of the first cell group P1, the third relay K3 is normal.
Of course, the adhesion detection mode of the second relay K2 may also be as follows: firstly, adhesion detection is carried out on the first relays K1 and K3, and if K1 and K3 are normal, the K1, the K2 and the K3 are controlled to be disconnected, and the adhesion condition of the K2 relay is detected. Detecting the voltage between the first detection point VC and the second detection point VG at two ends of the second relay K2 to obtain a voltage VGC, and if the voltage VGC is not equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1, indicating that the second relay K2 is normal; if the voltage VGC is equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1 (wherein, the voltage difference value of ≦ 5V can also be considered as equal), it indicates that the second relay K2 is stuck.
Of course, the adhesion states of the first relay K1 and the second relay K2 may be detected in other manners, which is not described in detail herein.
If the first relay K1, the second relay K2 or the third relay K3 are in the sticking state, an alarm and a state detection report are sent to the user. At this time, the power battery system of the vehicle is prohibited from switching between high and low voltage platforms.
In a specific embodiment, in order to avoid interference in the adhesion detection process and improve the accuracy of adhesion detection, the power battery system may further include a discharge relay K7, the discharge relay K7 is connected in parallel to both ends of the positive electrode and the negative electrode of the voltage charging interface, and the detection of the adhesion state of the positive electrode relay K5 may include: the second relay K2 is controlled to be closed, and the first relay K1, the third relay K3, the positive relay K5 and the negative relay K8 are opened; controlling a discharging relay K7 to be closed, discharging capacitive loads in the power battery system, and controlling a discharging relay K7 to be disconnected after discharging is finished so as to prevent the discharging relay from continuously consuming power; and detecting whether the voltage between a second detection point VG and a third detection point VD is equal to the sum of the voltages of the first electric core group P1 and the second electric core group P2, and if so, determining that the positive electrode relay K5 is in an adhesion state, wherein the second detection point VG is positioned between the negative electrode relay K8 and the first electric core group, and the third detection point VD is positioned between the positive electrode relay K5 and the discharging relay K7.
Specifically, as shown in fig. 1, the power battery system may include a discharge resistor R2 and a discharge relay K7 connected in series, wherein the other end of the discharge resistor is connected to the positive terminal of the output terminal of the power battery system, and the other end of the discharge relay K7 is connected to the negative terminal of the output terminal of the power battery system. For example, the resistance of the discharge resistor R2 can be selected to be 150K/10W, etc.
Wherein, power battery system can also include: the pre-charging relay K4 and the pre-charging resistor R1, and the pre-charging relay K4 and the pre-charging resistor R1 are connected in series and then connected in parallel to two ends of the positive electrode relay, and specifically, when receiving a power-on command or a charging command sent by the vehicle control unit, the method may further include: detecting a stuck state of the pre-charge relay K4, wherein if at least one of the positive relay K5 and the pre-charge relay K4 is stuck, the method may further include: controlling a second relay K1 to be closed, and controlling a discharging relay K7 to be closed, so as to discharge capacitive loads in the power battery system; and after the discharging is finished, detecting whether the voltage between the first detection point VC and the third detection point VD is zero, if so, determining that the positive relay K5 is in an adhesion state, and if not, determining that the pre-charging relay K4 is in the adhesion state, wherein the first detection point VC is positioned between the positive relay K5 and the second cell group.
Specifically, the adhesion detection method for the pre-charge relay K4 and the positive relay K5 may be as follows: firstly, performing adhesion detection on K1, K2 and K3, and if K1, K2 and K3 are normal, controlling K2 to be closed and K1, K3, K4 and K5 to be opened. The discharge relay K7 is closed again, and the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltage VGD of VG and VD is detected, and if the voltage VGD is not equal to the sum of the total voltage VP2 of the second cell core group P2 and the total voltage VP1 of the first cell core group P1, the fact that the pre-charging relay K4 and the positive relay K5 are normal is indicated; if the voltage VGD is equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1 (wherein, the voltage difference value is less than or equal to 5V, the difference value can be considered to be equal), it indicates that at least one of the pre-charge relay K4 and the positive relay K5 is stuck.
If at least one of the pre-charging relay K4 and the positive relay K5 is adhered, the subsequent detection method can be as follows:
if the voltage VGD is equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1, the control K2 is closed, and the control K1 and the control K3 are opened. The discharge relay K7 is closed again, and the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is not disconnected to form a complete loop, the voltage VCD between VC and VD is detected, and if the voltage VCD is 0V, the positive relay K5 is adhered (the pre-charging relay K4 is possibly adhered); if the voltage VCD is not equal to 0V, the pre-charging relay K4 is adhered, and the positive relay K5 is not adhered.
In a specific embodiment, the detecting the adhesion state of the negative relay specifically includes: controlling a second relay K2 to be closed, and controlling a discharging relay K7 to be closed, so as to discharge capacitive loads in the power battery system; and after the discharging is finished, whether the voltage between a first detection point VC and a fourth detection point VF is equal to the sum of the voltages of the first electric core group P1 and the second electric core group P2 is detected, if so, the negative relay K8 is determined to be in an adhesion state, wherein the first detection point VC is positioned between the positive relay K5 and the second electric core group P2, and the fourth detection point VF is positioned between the negative relay K8 and the discharging relay K7.
Specifically, the adhesion detection method for the negative electrode relay K8 may be as follows: firstly, performing adhesion detection on K1, K2 and K3, and if K1, K2 and K3 are normal, controlling K2 to be closed and K1, K3 and K8 to be opened. The discharge relay K7 is closed again, and the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltage VCF of VC and VF is detected, and if the voltage VCF is equal to the sum of the total voltage VP2 of the second electric core group P2 and the total voltage VP1 of the first electric core group P1 (the voltage difference is less than or equal to 5V and can be considered to be equal), the negative electrode relay K8 is adhered; if the voltage VCF is not equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1, the negative relay K8 is normal.
And if the positive relay K5 and/or the negative relay K8 are in the adhesion state, an alarm and a state detection report are sent to the user. At this time, the power battery system of the vehicle is prohibited from being charged and recharged.
It should be noted that the alarm here may be a voice alarm, a light alarm, a vehicle display screen text alarm, or a combination of multiple alarms, and the like, and the status detection report may include the existence of a stuck relay, the current status of the vehicle, and the like.
Of course, in other embodiments of the present application, detecting the adhesion states of the positive relay and the negative relay respectively may further include: disconnecting the positive relay, detecting whether the voltage difference between two ends of the positive relay is zero, and if so, determining that the positive relay is in an adhesion state; and disconnecting the negative relay, detecting whether the voltage difference between two ends of the negative relay is zero, and if so, determining that the negative relay is in an adhesion state.
In a specific embodiment, the power battery detection method provided by the present application may further include: if the high-low voltage platform switching signal sent by the vehicle controller is not received and the high-voltage power-on command sent by the vehicle controller is received, whether the second relay K2, the pre-charging relay K4, the positive relay K5 and the negative relay K8 are in an adhesion state or not is detected.
Specifically, as shown in fig. 4, a specific detection method for detecting the high-voltage platform of the battery system before power-on may be as follows: before the system is electrified, all relays are controlled to be in an off state, and the relays related to the electrification of the high-voltage platform system comprise a second relay K2, a pre-charging relay K4, a positive relay K5 and a negative relay K8, so that after all relays are disconnected, the adhesion states of the second relay K2, the pre-charging relay K4, the positive relay K5 and the negative relay K8 are detected.
Specifically, the second relay K2 sticking detection process may be as follows: and controlling the second relay K2 to be switched off, and detecting the adhesion condition of the second relay K2. Detecting voltages VG and VC at two ends of the second relay K2 to obtain a voltage VGC, and if the voltage VGC is not equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1, indicating that the second relay K2 is normal; if the voltage VGC is equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1 (wherein, the voltage difference value of ≦ 5V can also be considered as equal), it indicates that the second relay K2 is stuck.
The adhesion detection method of the pre-charging relay K4 and the positive pole relay K5 can be as follows: k2 is controlled to be closed, and K4 and K5 are controlled to be opened. The discharge relay K7 is closed again, and the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltage VGD of VG and VD is detected, and if the voltage VGD is not equal to the sum of the total voltage VP2 of the second cell core group P2 and the total voltage VP1 of the first cell core group P1, the fact that the pre-charging relay K4 and the positive relay K5 are normal is indicated; if the voltage VGD is equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1 (wherein, the voltage difference value is less than or equal to 5V, the difference value can be considered to be equal), it indicates that at least one of the pre-charge relay K4 and the positive relay K5 is stuck.
If at least one of the pre-charging relay K4 and the positive relay K5 is adhered, the second relay K2 is controlled to be closed, then the discharging relay K7 is controlled to be closed, and the capacitor of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is not switched off, the voltage VCD between VC and VD is detected, and if the voltage VCD is 0V, the positive relay K5 is stuck (the pre-charging relay K4 may be stuck); if the voltage VCD is not equal to 0V, the pre-charging relay K4 is adhered, and the positive relay K5 is not adhered.
The adhesion detection method of the negative relay K8 can be as follows: and the battery management module controls the K2 to be closed, and then the discharging relay K7 is closed, so that the capacitor of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is not switched off, the voltage VCF of VC and VF is detected, and if the voltage VCF is equal to the sum of the total voltage VP2 of the second electric core group P2 and the total voltage VP1 of the first electric core group P1 (the voltage difference is less than or equal to 5V and can be considered to be equal), the negative electrode relay K8 is adhered; if the voltage VCF is not equal to the sum of the total voltage VP2 of the second cell group P2 and the total voltage VP1 of the first cell group P1, the negative relay K8 is normal.
If the second relay K2, the pre-charging relay K4, the positive relay K5 or the negative relay K8 are in the adhesion state, an alarm and a state detection report are sent to a user. At this time, the power battery system of the vehicle is prohibited from powering up the high voltage platform.
In a specific embodiment, the power battery system may further include a charging relay K6, where the charging relay K6 is located between the positive relay and the voltage charging positive interface, and the power battery detection method provided by the present application may further include:
if the high-low voltage platform switching signal sent by the vehicle controller is not received and the high-voltage charging instruction sent by the vehicle controller is received, whether the second relay K2, the pre-charging relay K4, the positive relay K5, the negative relay K8 and the charging relay K6 are in an adhesion state or not is detected. Wherein, the testing process of charging relay K6 includes: the second relay K2 and the positive relay K5 are controlled to be closed, and the pre-charging relay K4 is opened; controlling the discharging relay to be closed, discharging capacitive loads in the power battery system, controlling the discharging relay to be disconnected after discharging is finished, detecting whether the voltage between the seventh detection point and the second detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the charging relay is adhered; and the seventh detection point is positioned between the charging relay and the voltage charging positive electrode interface.
Specifically, as shown in fig. 5, a specific detection method for detecting the high voltage platform of the battery system before charging may be as follows:
before the system charges, all relays are controlled to be in an off state, and the relays related to charging of the high-voltage platform system comprise a second relay K2, a pre-charging relay K4, a positive relay K5, a negative relay K8 and a charging relay K6, so that after all relays are turned off, the adhesion states of the second relay K2, the pre-charging relay K4, the positive relay K5, the negative relay K8 and the charging relay K6 are detected.
The detection mode of the adhesion state of the second relay K2, the pre-charging relay K4, the positive relay K5 and the negative relay K8 is the same as the detection mode in the electrification of the high-voltage platform system.
In addition, the charging relay K6 may be detected as follows: and the battery management module controls K2 and K5 to be closed, K4 to be opened, and then controls the discharging relay K7 to be closed, so that the capacitor of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltage VEG of VE and VG is detected, and if the voltage VEG is not equal to the sum of the total voltage VP2 of the second cell core group P2 and the total voltage VP1 of the first cell core group P1, the charging relay K6 is normal; if the voltage VEG is equal to the sum of the total voltage VP2 of the second electric core group P2 and the total voltage VP1 of the first electric core group P1 (the voltage difference is less than or equal to 5V, which can be considered to be equal), the charging relay K6 is proved to be stuck.
And if the second relay K2, the pre-charging relay K4, the positive relay K5, the negative relay K8 or the charging relay K6 are in the adhesion state, an alarm and a state detection report are sent to a user. At this time, the power battery system of the vehicle is prohibited from performing high-voltage platform charging.
In a specific embodiment, the power battery detection method provided by the present application may further include: if the high-low voltage platform switching signal sent by the vehicle controller is not received and the low-voltage power-on command sent by the vehicle controller is received, the adhesion states of the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5 and the negative relay K8 are detected.
Specifically, as shown in fig. 6, a specific detection method for detecting the low-voltage platform of the battery system before power-on may be as follows:
before the system is powered on, all relays are controlled to be in an off state, and the relays related to charging of the low-voltage platform system comprise a first relay K1, a third relay K3, a pre-charging relay K4, a positive relay K5 and a negative relay K8, so that after all relays are switched off, the adhesion states of the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5 and the negative relay K8 are detected.
Specifically, the sticking detection process of the first relay K1 may be as follows: the battery management module controls the first relay K1 to be disconnected, detects the voltage VAG between two ends VA and VG of the first relay K1, and if the voltage VAG is equal to the total voltage VP1 of the first cell group P1, the first relay K1 is not stuck (the voltage difference is less than or equal to 5V and can be considered to be equal); if voltage VAG is 0V, it indicates that first relay K1 is stuck.
The third relay K3 sticking detection process may be as follows: the battery management module controls the first relays K1 and K3 to be disconnected, detects voltages VGC of VG and VC, and if the voltage VGC is equal to the total voltage VP1 of the first cell group P1, the third relay K3 is stuck (the voltage difference value is less than or equal to 5V and can be considered to be equal); if the voltage VGC is not equal to the total voltage VP1 of the first cell group P1, the third relay K3 is normal.
The adhesion detection method of the pre-charging relay K4 and the positive pole relay K5 can be as follows: the third relay K3 is controlled to be closed, and the first relay K1, the pre-charging relay K4 and the positive relay K5 are controlled to be opened. And then controls the discharge relay K7 to close, so that the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltage VGD of VG and VD is detected, and if the voltage VGD is not equal to the total voltage VP1 of the first cell group P1, the fact that the pre-charging relay K4 and the positive electrode relay K5 are normal is indicated; if the voltage VGD is equal to the total voltage VP1 of the first cell group P1 (wherein, the voltage difference is less than or equal to 5V can be considered as equal), it indicates that at least one of the pre-charge relay K4 and the positive relay K5 is stuck.
If at least one of the pre-charging relay K4 and the positive relay K5 is adhered, the third relay K3 is controlled to be closed, and the first relay K1, the pre-charging relay K4 and the positive relay K5 are disconnected. And then the discharge relay K7 is controlled to be closed, and the capacitance of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is not switched off, the voltage VCD between VC and VD is detected, and if the voltage VCD is 0V, the positive relay K5 is stuck (the pre-charging relay K4 may be stuck); if the voltage VCD is not equal to 0V, the pre-charging relay K4 is adhered, and the positive relay K5 is not adhered.
The adhesion detection method of the negative relay K8 can be as follows: the battery management module controls the K1 and the K8 to be disconnected, then the discharging relay K7 is closed, and the capacitor of the capacitive load is discharged. After the discharging is finished, the discharging relay K7 is switched off, the voltages of VA and VF are detected, and if the voltage VAF is equal to the total voltage VP1 of the first electric core group P1 (the voltage difference is less than or equal to 5V and can be considered to be equal), the negative relay K8 is adhered; if the voltage VAF is not equal to the total voltage VP1 of the first cell group P1, the negative relay K8 is normal.
And if the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5 or the negative relay K8 are in the adhesion state, an alarm and a state detection report are sent to a user. At this point, the power battery system of the vehicle is prohibited from powering up the low voltage platform.
In a specific embodiment, the power battery detection method provided by the present application may further include: if the high-low voltage platform switching signal sent by the vehicle controller is not received and the low-voltage charging command sent by the vehicle controller is received, the adhesion states of the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5, the negative relay K8 and the charging relay K6 are detected.
Specifically, as shown in fig. 7, a specific detection method for the detection before the charging of the low voltage platform of the battery system may be as follows:
before the system is charged, all relays are controlled to be in an off state, and the relays related to charging of the low-voltage platform system comprise a first relay K1, a third relay K3, a pre-charging relay K4, a positive relay K5, a negative relay K8 and a charging relay K6, so that after all relays are turned off, the adhesion states of the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5, the negative relay K8 and the charging relay K6 are detected.
The detection mode of the adhesion state of the first relay K1, the third relay K3, the pre-charging relay K4 and the positive electrode relay K5 is the same as the detection mode in the power-on process of the low-voltage platform system.
The charging relay K6 is detected as follows: the battery management module controls K3 and K5 to be closed and K1 and K4 to be opened. Closing the discharging relay K7, discharging the capacitor of the capacitive load, after the discharging is finished, disconnecting the discharging relay K7, detecting the voltage VEG of VE and VG, and if the voltage VEG is not equal to the total voltage VP1 of the first cell group P1, enabling the charging relay K6 to be normal; if the voltage VEG is equal to the total voltage VP1 of the first cell group P1 (the voltage difference is less than or equal to 5V, the voltage difference can be considered to be equal), the charging relay K6 is indicated to be stuck.
And if the first relay K1, the third relay K3, the pre-charging relay K4, the positive relay K5, the negative relay K8 or the charging relay K6 are in an adhesion state, an alarm and a state detection report are sent to a user. At this time, the power battery system of the vehicle is prohibited from performing low-voltage platform charging.
It should be noted that, for the pre-charge relay K4, the charge relay K6 and the discharge relay K7, in addition to the above-mentioned adhesion detection method, in other embodiments of the present application, other detection methods may also be adopted, for example, the method of detecting whether the charge relay K6 is adhered may include: and (3) disconnecting the charging relay K6, detecting whether the voltage between two ends of the charging relay K6 is zero, if so, indicating that the charging relay K6 is adhered, and if not, indicating that the charging relay K6 is not adhered.
In summary, according to the power battery detection method provided by the embodiment of the invention, the adhesion problem of the relay of the power battery can be rapidly judged with high efficiency, and the safety of the power battery can be effectively ensured, so that the safety of the vehicle can be ensured.
In a third aspect, based on the same inventive concept, the present embodiment provides a vehicle 500, as shown in fig. 8, including: a vehicle body 501 and a power battery system 502 as described above in relation to the first aspect.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a power battery detection method, its characterized in that is applied to the battery management module in power battery system, battery management module and vehicle control unit are connected, power battery system still includes first electric core group, second electric core group, parallelly connected first relay at first electric core group both ends, establish ties the second relay between first electric core group and second electric core group, parallelly connected third relay at second electric core group both ends, connect the positive pole relay between second electric core group and the positive interface of voltage charging and connect the negative pole relay between first electric core group and the negative interface of voltage charging, the method includes:
if a high-low voltage platform switching signal sent by the vehicle control unit is received, detecting the adhesion state of the first relay, the second relay and the third relay;
if the positive relay and the negative relay are not adhered, respectively detecting the adhesion states of the positive relay and the negative relay when a power-on instruction or a charging instruction sent by the whole vehicle controller is received;
and if the positive relay and/or the negative relay are adhered, an alarm and a state detection report are sent to a user.
2. The power battery detection method of claim 1, wherein the power battery system further comprises a discharge relay, the discharge relay is connected in parallel to two ends of the voltage charging positive and negative electrode interfaces, and the detecting of the adhesion state of the positive electrode relay comprises:
controlling the second relay to be closed, and the first relay, the third relay, the positive relay and the negative relay to be opened;
controlling the discharging relay to be closed, discharging capacitive loads in the power battery system, and controlling the discharging relay to be disconnected after discharging is finished;
and detecting whether the voltage between a second detection point and a third detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the positive relay is in an adhesion state, wherein the second detection point is positioned between the negative relay and the first electric core group, and the third detection point is positioned between the positive relay and the discharging relay.
3. The power battery detection method of claim 2, wherein the power battery system further comprises a discharge relay, the discharge relay is connected in parallel to two ends of the voltage charging positive and negative electrode interfaces, and the detecting of the adhesion state of the negative electrode relay comprises:
controlling the second relay to be closed, and opening the first relay, the third relay and the negative relay;
controlling the discharge relay to be closed to discharge capacitive loads in the power battery system;
and detecting whether the voltage between a first detection point and a fourth detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the negative relay is in an adhesion state, wherein the first detection point is positioned between the positive relay and the second electric core group, and the fourth detection point is positioned between the negative relay and the discharging relay.
4. The power battery detection method of claim 3, wherein the detecting the stuck state of the first relay, the second relay, and the third relay comprises:
controlling the first relay to be switched off, detecting whether the voltage between the second detection point and the fifth detection point is zero, and if so, determining that the first relay is in an adhesion state;
controlling the second relay to be disconnected, detecting whether the voltage between the fifth detection point and the sixth detection point is zero, and if so, determining that the second relay is in an adhesion state;
controlling the first relay and the third relay to be disconnected, detecting whether the voltage between the first detection point and the second detection point is equal to the voltage of the first electric core group, and if so, determining that the third relay is in an adhesion state;
the fifth detection point is located between the second relay and the first electric core group, and the sixth detection point is located between the second relay and the second electric core group.
5. The power battery testing method of claim 2, wherein the power battery system further comprises a pre-charge relay connected in parallel across the positive relay, the method further comprising:
and if a high-low voltage platform switching signal sent by the vehicle control unit is not received and a high-voltage electrifying instruction sent by the vehicle control unit is received, detecting whether the second relay, the pre-charging relay, the positive relay and the negative relay are in an adhesion state.
6. The power battery detection method of claim 5, wherein the power battery system further comprises a charge relay positioned between the positive relay and the voltage charge positive interface, the method further comprising:
if a high-low voltage platform switching signal sent by the vehicle control unit is not received and a high-voltage charging instruction sent by the vehicle control unit is received, detecting whether the second relay, the pre-charging relay, the positive relay, the negative relay and the charging relay are in an adhesion state or not;
the detection process of the charging relay comprises the following steps: controlling the second relay and the positive relay to be closed, and disconnecting the pre-charging relay;
controlling the discharging relay to be closed, discharging capacitive loads in the power battery system, controlling the discharging relay to be opened after discharging is finished, detecting whether the voltage between a seventh detection point and the second detection point is equal to the sum of the voltages of the first electric core group and the second electric core group, and if so, determining that the charging relay is adhered;
the seventh detection point is located between the charging relay and the voltage charging positive electrode interface.
7. The power cell detection method of claim 5, further comprising:
and if a high-low voltage platform switching signal sent by the vehicle control unit is not received and a low-voltage power-on instruction sent by the vehicle control unit is received, detecting the adhesion state of the first relay, the third relay, the pre-charging relay, the positive relay and the negative relay.
8. The power cell detection method of claim 6, further comprising:
if a high-low voltage platform switching signal sent by the vehicle control unit is not received and a low-voltage charging instruction sent by the vehicle control unit is received, the adhesion states of the first relay, the third relay, the pre-charging relay, the positive relay, the negative relay and the charging relay are detected.
9. A power battery system, comprising: the battery management module is connected with the vehicle control unit, the power battery system further comprises a first battery cell group, a second battery cell group, a first relay connected in parallel at two ends of the first battery cell group, a second relay connected in series between the first battery cell group and the second battery cell group, a third relay connected in parallel at two ends of the second battery cell group, a positive relay connected between the second battery cell group and the voltage charging positive electrode interface, and a negative relay connected between the first battery cell group and the voltage charging negative electrode interface, and the battery management module realizes the power battery detection method according to any one of claims 1 to 8.
10. A vehicle, characterized by comprising: a vehicle body and a power battery system as claimed in claim 9.
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