CN111638466B - Method for identifying whether detachable battery pack is firmly connected with whole vehicle after replacement - Google Patents
Method for identifying whether detachable battery pack is firmly connected with whole vehicle after replacement Download PDFInfo
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- CN111638466B CN111638466B CN202010448568.5A CN202010448568A CN111638466B CN 111638466 B CN111638466 B CN 111638466B CN 202010448568 A CN202010448568 A CN 202010448568A CN 111638466 B CN111638466 B CN 111638466B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012795 verification Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 4
- 230000036541 health Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 208000019901 Anxiety disease Diseases 0.000 description 2
- 230000036506 anxiety Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a method for identifying whether a detachable battery pack is firmly connected with a whole vehicle after replacement, which adopts one of the following modes to detect and identify whether the detachable battery pack is firmly connected: (1) determining by detecting a high voltage interlock signal; (2) The whole vehicle control system VCU is communicated with the battery management system BMS for judgment; and (3) judging through checking the battery pack voltage. The invention can achieve the purpose of identifying whether the connection of the detachable battery pack is firm, solves the problem that the detachable power battery pack cannot be judged whether the connection of the battery pack is firm after replacement, effectively judges whether the connection of the battery pack is firm, can play a role in protecting the safety of electric equipment and circuits of automobiles, and plays a role in ensuring the driving safety.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method for identifying whether a detachable battery pack is firmly connected with a whole vehicle after replacement.
Background
The power battery pack is a power source of the electric automobile, most of the power battery packs of the electric automobiles sold in the market at present are fixed and not detachable, and the operation mode of the electric automobile type developed by a small part of main factories is that the whole power battery pack is replaced.
At present, some host factories are researching and developing detachable power battery packs, and the battery packs can be automatically replaced by automobile users, so that the method is simple and convenient to operate, and the problems of charging anxiety, mileage anxiety and the like of users caused by slow charging of electric vehicles can be solved. However, it is difficult to determine whether the battery pack is firmly connected by observing the physical connection after replacement. If the battery pack is not firmly connected, the danger of arc striking and the like at the poor contact position of the battery pack can possibly occur, and damage to the battery pack, on-vehicle electrical appliances, circuits and the like can be caused.
At present, whether the battery pack is connected or not can only be judged by visually observing the physical connection or using a checking circuit, but is limited by conditions such as space, visual field and the like, and almost cannot be judged.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks.
Therefore, the present invention is directed to a method for identifying whether a detachable battery pack is firmly connected with a whole vehicle after replacement.
In order to achieve the above-mentioned objective, an embodiment of the present invention provides a method for identifying whether a detachable battery pack is firmly connected with a whole vehicle after replacement, wherein the method comprises the following steps:
(1) Determination by detecting high voltage interlock signals
The VCU of the whole vehicle control system detects a high-voltage interlocking signal of the whole vehicle, receives the high-voltage interlocking signal from the BMS, and considers that the battery pack is firmly connected when the high-voltage interlocking signals of the BMS and the VCU are continuously valid;
(2) Communication judgment between VCU and BMS (battery management system) through whole vehicle control system
The VCU and the BMS perform security authentication and key matching;
after the matching is successful, the VCU requests the BMS to acquire the related information of the battery;
the BMS feeds back battery pack information required by the VCU;
the VCU requests the BMS to send the working state information of the battery pack after finishing verification;
the BMS feeds back information required by the VCU, and the VCU judges that the battery pack is firmly connected after verification is correct;
(3) Determination by checking battery pack voltage
And the VCU requests the BMS to send real-time battery pack state information, judges whether the battery pack voltage is normal according to the information, and judges that the battery pack is firmly connected if the battery pack voltage is within a preset error range.
Further, in the (1) th mode, the VCU receives a high voltage interlock signal from the BMS through a CAN bus and then performs a digital signal filtering process on the high voltage interlock signal.
Further, in the (2) th mode, the security authentication and key matching of the VCU and the BMS includes the steps of:
the VCU sends a request seed to the BMS for security authentication;
the BMS feeds back seeds to the VCU for security authentication;
the VCU transmits a key to the BMS;
the BMS calculates the secret key and matches the secret key of the VCU, and sends the matching result to the VCU.
Further, in the (2) mode, after the matching is successful, the VCU requests the BMS to obtain relevant information of the battery, including battery manufacturer and number information;
and the VCU requests the BMS to send working state information of the battery pack after finishing verification, wherein the working state information comprises battery pack electric quantity, electric current and fault information.
Further, in the (3) th aspect, the battery pack state information includes: the battery pack total voltage, the module unit voltage, the real-time battery pack temperature, the state of charge (SOC) of the real-time battery pack and the state of health (SOH) of the real-time battery pack.
According to the method for identifying whether the detachable battery pack is firmly connected with the whole vehicle after replacement, the purpose of identifying whether the detachable battery pack is firmly connected can be achieved through the three modes, the problem that whether the detachable power battery pack is firmly connected after replacement can not be solved, whether the battery pack is firmly connected is effectively judged, the effect of protecting electric equipment and circuits of the vehicle can be achieved, and the effect of guaranteeing driving safety is achieved. The invention can effectively reduce the misjudgment rate by judging in three modes; the method is not influenced by the state of the battery pack, any detachable battery pack can judge whether the connection is firm or not by the method, and the method has higher accuracy and higher speed than the method for judging whether the connection of the battery pack is firm or not by observing the physical connection mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method for identifying whether a detachable battery pack is firmly connected with a whole vehicle after replacement according to an embodiment of the invention;
FIG. 2 is a flow chart of the detection and judgment of the high voltage interlock signal according to the embodiment of the invention;
fig. 3 is a flowchart of a judgment process by a VCU in communication with a BMS according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Before describing the method for identifying whether the detachable battery pack is firmly connected with the whole vehicle after replacement, the following related terms are described:
and (3) battery pack: an electric automobile power battery pack; VCU, vehicle control system; BMS, battery management system; MCU, motor controller; CAN: a controller area network; SOC: battery pack state of charge; SOH: a battery pack health status; high pressure interlock: the electrical connection integrity of all the system loops connected to the high voltage bus on the electric vehicle is checked by using the low voltage signal.
The invention provides a method for identifying whether connection of a detachable battery pack is firm after replacement, wherein the detachable battery pack is internally provided with a BMS, a battery module, a signal acquisition unit and the like. The BMS has several functions: 1. detecting the voltage of the real-time module; 2. detecting the temperature of the real-time module; 3. detecting the SOC of the real-time module; 4. information storage functions such as battery pack manufacturers and numbers; 5. and detecting SOH of the battery pack.
As shown in fig. 1, in the method for identifying whether the detachable battery pack is firmly connected with the whole vehicle after replacement according to the embodiment of the invention, one of the following modes is adopted to detect and identify whether the detachable battery pack is firmly connected:
(1) Determination by detecting high voltage interlock signals
The VCU of the whole vehicle control system detects the high-voltage interlocking signal of the whole vehicle control system, receives the high-voltage interlocking signal from the BMS, and when the high-voltage interlocking signals of the BMS and the VCU are continuously valid, the battery pack is firmly connected.
Specifically, as shown in fig. 2, after the whole vehicle is powered down, the original battery pack on the vehicle is taken out, and the replacement battery pack is connected. And then the whole vehicle is electrified, a high-voltage interlocking switch at the BMS end is closed, the high-voltage interlocking signal is detected to be effective, the BMS is awakened, and the high-voltage interlocking signal is sent to the VCU through the CAN. The VCU detects the self-high-voltage interlocking signal, receives the BMS high-voltage interlocking signal sent by the CAN, performs steps such as digital signal filtering processing, judges that the BMS and the VCU high-voltage interlocking signal are continuously effective, and considers that the battery pack is firmly connected.
In the embodiment of the invention, if the high-voltage interlocking signal continuously changes in an invalid manner for 5 times or is always invalid, the connection of the battery pack is not firm, and the whole vehicle is powered down; and if not, judging that the battery pack is reliably connected.
(2) Communication judgment between VCU and BMS (battery management system) through whole vehicle control system
A) The VCU and the BMS perform security authentication and key matching;
specifically, as shown in fig. 3, the security authentication and key matching of the VCU and the BMS includes the following steps:
the VCU sends a request seed to the BMS for security authentication;
the BMS feeds back the seeds to the VCU for security authentication;
the VCU sends the secret key to the BMS;
the BMS calculates the key and matches the key of the VCU, and sends the matching result to the VCU.
B) After the matching is successful, the VCU requests the BMS to acquire the related information of the battery;
in the embodiment of the invention, after the matching is successful, the VCU requests the BMS to acquire the related information of the battery, including information of battery manufacturer, number and the like.
C) The BMS feeds back battery pack information required by the VCU;
d) The VCU requests the BMS to send the working state information of the battery pack after finishing verification;
specifically, the VCU requests the BMS to transmit the operating state information of the battery pack after completing the verification, including information such as the battery pack power, current, and failure.
E) And the BMS feeds back information required by the VCU, and the VCU judges that the battery pack is firmly connected after verification is correct.
(3) Determination by checking battery pack voltage
And the VCU requests the BMS to send real-time battery pack state information, judges whether the battery pack voltage is normal according to the information, and judges that the battery pack is firmly connected if the battery pack voltage is within a preset error range.
In an embodiment of the present invention, battery pack status information includes: the battery pack total voltage, the module unit voltage, the real-time battery pack temperature, the state of charge (SOC) of the real-time battery pack and the state of health (SOH) of the real-time battery pack.
According to the method for identifying whether the detachable battery pack is firmly connected with the whole vehicle after replacement, the purpose of identifying whether the detachable battery pack is firmly connected can be achieved through the three modes, the problem that whether the detachable power battery pack is firmly connected after replacement can not be solved, whether the battery pack is firmly connected is effectively judged, the effect of protecting electric equipment and circuits of the vehicle can be achieved, and the effect of guaranteeing driving safety is achieved. The invention can effectively reduce the misjudgment rate by judging in three modes; the method is not influenced by the state of the battery pack, any detachable battery pack can judge whether the connection is firm or not by the method, and the method has higher accuracy and higher speed than the method for judging whether the connection of the battery pack is firm or not by observing the physical connection mode.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. The method for identifying whether the detachable battery pack is firmly connected with the whole vehicle after replacement is characterized by detecting and identifying whether the detachable battery pack is firmly connected by adopting the following modes: the method comprises the following steps:
(1) Judging by detecting the high-voltage interlocking signal:
the VCU of the whole vehicle control system detects a high-voltage interlocking signal of the whole vehicle, receives the high-voltage interlocking signal from the BMS, and considers that the battery pack is firmly connected when the high-voltage interlocking signals of the BMS and the VCU are continuously valid;
after the whole vehicle is powered down, the original battery pack on the vehicle is taken out, and the replacement battery pack is connected; then the whole vehicle is electrified, a BMS end high-voltage interlocking switch is closed, the high-voltage interlocking signal is detected to be effective, the BMS is awakened, and the high-voltage interlocking signal is sent to the VCU through the CAN;
the VCU detects the self-high-voltage interlocking signal, receives the BMS high-voltage interlocking signal sent by the CAN, performs digital signal filtering processing, judges that the BMS and the VCU high-voltage interlocking signal are continuously effective, and considers that the battery pack is firmly connected;
(2) And the whole vehicle control system VCU and the battery management system BMS communicate and judge:
the VCU and the BMS perform security authentication and key matching;
after the matching is successful, the VCU requests the BMS to acquire the related information of the battery;
the BMS feeds back battery pack information required by the VCU;
the VCU requests the BMS to send the working state information of the battery pack after finishing verification;
the BMS feeds back information required by the VCU, and the VCU judges that the battery pack is firmly connected after verification is correct;
(3) Judging by checking the voltage of the battery pack:
the VCU requests the BMS to send real-time battery pack state information, judges whether the battery pack voltage is normal according to the information, and judges that the battery pack is firmly connected if the battery pack voltage is within a preset error range;
in the (1) th mode, the VCU receives a high-voltage interlock signal from the BMS through a CAN bus, and then performs digital signal filtering processing on the high-voltage interlock signal;
in the (2) th mode, the security authentication and key matching of the VCU and the BMS includes the steps of:
the VCU sends a request seed to the BMS for security authentication;
the BMS feeds back seeds to the VCU for security authentication;
the VCU transmits a key to the BMS;
the BMS calculates a secret key and matches the secret key of the VCU, and sends a matching result to the VCU; in the (2) mode, after the matching is successful, the VCU requests the BMS to acquire the related information of the battery, including battery manufacturer and number information;
the VCU requests the BMS to send working state information of the battery pack after finishing verification, wherein the working state information comprises battery pack electric quantity, current and fault information;
in the (3) th aspect, the battery pack state information includes: the battery pack total voltage, the module unit voltage, the real-time battery pack temperature, the state of charge (SOC) of the real-time battery pack and the state of health (SOH) of the real-time battery pack.
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| CN202010448568.5A CN111638466B (en) | 2020-05-25 | 2020-05-25 | Method for identifying whether detachable battery pack is firmly connected with whole vehicle after replacement |
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| CN202010448568.5A CN111638466B (en) | 2020-05-25 | 2020-05-25 | Method for identifying whether detachable battery pack is firmly connected with whole vehicle after replacement |
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| CN111638466B true CN111638466B (en) | 2024-03-29 |
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