CN111638467B - Method for identifying whether connection between detachable battery pack and external charging base is firm - Google Patents
Method for identifying whether connection between detachable battery pack and external charging base is firm Download PDFInfo
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- CN111638467B CN111638467B CN202010449291.8A CN202010449291A CN111638467B CN 111638467 B CN111638467 B CN 111638467B CN 202010449291 A CN202010449291 A CN 202010449291A CN 111638467 B CN111638467 B CN 111638467B
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- battery pack
- charging base
- bms
- base controller
- voltage
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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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a method for identifying whether connection between a detachable battery pack and an external charging base is firm, which comprises the following steps: detecting and identifying whether the detachable battery pack is firmly connected by adopting one of the following modes: (1) determining by detecting a high voltage interlock signal; (2) communication judgment with the BMS through the charging base controller; and (3) judging the reliability by checking the voltage of the battery pack. The invention can achieve the purpose of identifying whether the detachable battery pack is firmly connected, and can effectively reduce the misjudgment rate; the identification method is not influenced by the state of the battery pack, and any detachable battery pack can be used for judging whether the connection is firm or not.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method for identifying whether connection between a detachable battery pack and an external charging base is firm or not.
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. The removable power battery pack may be charged by an external charging base. Whether the power battery pack is firmly connected with the charging base or not is judged to have potential safety hazards only by means of physical connection. If the battery pack is not firmly connected, the risks of arc striking and the like at the poor contact position of the battery pack can occur, so that potential safety hazards can occur.
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, depending on the careful degree of a user, and the wrong judgment exists.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks.
Therefore, the present invention provides a method for identifying whether the detachable battery pack is firmly connected with the external charging base.
In order to achieve the above-mentioned object, an embodiment of the present invention provides a method for identifying whether a detachable battery pack is firmly connected to an external charging base, comprising the following steps:
detecting and identifying whether the detachable battery pack is firmly connected by adopting one of the following modes:
(1) Determination by detecting high voltage interlock signals
The charging base controller detects a self high-voltage interlocking signal, receives the high-voltage interlocking signal from the battery management system BMS, and considers that the battery pack is firmly connected when judging that the high-voltage interlocking signals controlled by the BMS and the charging base are continuously valid;
(2) Communication judgment between charging base controller and BMS
The charging base controller performs security authentication and key matching with the BMS;
after the matching is successful, the charging base controller requests the BMS to acquire the related information of the battery;
BMS feeds back battery pack information required by charging base control;
the charging base controller requests the BMS to send the working state information of the battery pack after the verification is completed;
the BMS feeds back information required by the charging base controller, and the charging base controller judges that the battery pack is firmly connected after verification is correct;
(3) Determination by checking battery pack voltage
And the charging base controller 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 charging base controller 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 safety authentication and key matching of the charging base controller and the BMS includes the steps of:
the charging base controller sends a request seed to the BMS for safety authentication;
the BMS feeds back seeds to the charging base controller for safety authentication;
the charging base controller transmits a key to the BMS;
the BMS calculates the secret key and matches the secret key of the charging base controller, and sends the matching result to the charging base controller.
Further, in the (2) mode, after the matching is successful, the charging base controller requests the BMS to acquire the related information of the battery, including battery manufacturer and number information;
and the charging base controller requests the BMS to send working state information of the battery pack after the verification is completed, 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 external charging base, the purpose of identifying whether the detachable battery pack is firmly connected can be achieved by judging in three modes together, and the misjudgment rate can be effectively reduced; the identification method is not influenced by the state of the battery pack, and any detachable battery pack can be used for judging whether the connection is firm or not. The invention can solve the problem that the detachable power battery pack and the external charging base are connected to judge whether the battery pack is firmly connected, effectively judge whether the battery pack is firmly connected, and can play a role in improving the charging safety of the battery pack. By adopting the method, any battery pack state can be judged whether the connection is firm or not by the method, and the accuracy and the speed are higher than those of judging whether the battery pack connection 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 securely connected to an external charging base according to an embodiment of the present 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 illustrating a communication judgment process with a BMS through a charging base controller 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 external charging base, the following terms are related:
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 between a detachable battery pack and an external charging base is firm, 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. The charging base is internally provided with a controller, and mainly realizes a charging control function.
As shown in fig. 1, in the method for identifying whether the detachable battery pack is firmly connected with the external charging base according to the embodiment of the invention, one of the following ways is adopted to detect and identify whether the detachable battery pack is firmly connected:
(1) Determination by detecting high voltage interlock signals
The charging base controller detects the self high-voltage interlocking signal, receives the high-voltage interlocking signal from the battery management system BMS, and considers that the battery pack is firmly connected when judging that the BMS and the high-voltage interlocking signal controlled by the charging base are continuously valid.
Specifically, as shown in fig. 2, after the battery pack is connected with the charging base, a user opens the charging base to perform charging, the BMS end high-voltage interlock switch is closed, the high-voltage interlock signal is detected to be effective, and the BMS is awakened and sends the high-voltage interlock signal to the charging base controller through the CAN. The charging base controller 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 charging base controller high-voltage interlocking signal are continuously effective, considers that the battery pack is firmly connected, and otherwise, prohibits charging.
In the embodiment of the invention, if the high-voltage interlocking signal continuously changes in an invalid state for 5 times or is always invalid, judging that the battery pack is not firmly connected, and prohibiting charging; and if not, judging that the battery pack is reliably connected.
(2) Communication judgment between charging base controller and BMS
A) The charging base controller performs security authentication and key matching with the BMS.
Specifically, as shown in fig. 3, the safety authentication and key matching of the charging base controller and the BMS includes the following steps:
the charging base controller sends a request seed to the BMS for safety authentication;
the BMS feeds back seeds to the charging base controller for safety authentication;
the charging base controller sends a secret key to the BMS;
the BMS calculates the key and matches with the key of the charging base controller, and sends the matching result to the charging base controller.
B) After the matching is successful, the charging base controller requests the BMS to acquire the related information of the battery.
Specifically, after the matching is successful, the charging base controller requests the BMS to acquire relevant information of the battery, including information of battery manufacturers, numbers and the like.
C) The BMS feeds back battery pack information required for the charging base control.
D) And the charging base controller requests the BMS to send the working state information of the battery pack after the verification is completed.
Specifically, the charging base controller requests the BMS to send working state information of the battery pack after the verification is completed, wherein the working state information comprises information such as battery pack capacity, current and faults.
E) And the BMS feeds back information required by the charging base controller, and the charging base controller judges that the battery pack is firmly connected after verification is correct.
(3) Determination by checking battery pack voltage
And the charging base controller 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 external charging base, the purpose of identifying whether the detachable battery pack is firmly connected can be achieved by judging in three modes together, and the misjudgment rate can be effectively reduced; the identification method is not influenced by the state of the battery pack, and any detachable battery pack can be used for judging whether the connection is firm or not. The invention can solve the problem that the detachable power battery pack and the external charging base are connected to judge whether the battery pack is firmly connected, effectively judge whether the battery pack is firmly connected, and can play a role in improving the charging safety of the battery pack. By adopting the method, any battery pack state can be judged whether the connection is firm or not by the method, and the accuracy and the speed are higher than those of judging whether the battery pack connection 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 external charging base is characterized by adopting one of the following modes:
(1) Judging by detecting the high-voltage interlocking signal:
the charging base controller detects a self high-voltage interlocking signal, receives the high-voltage interlocking signal from the battery management system BMS, and considers that the battery pack is firmly connected when judging that the high-voltage interlocking signals controlled by the BMS and the charging base are continuously valid;
(2) Judge through charging base controller and BMS communication:
the charging base controller performs security authentication and key matching with the BMS;
after the matching is successful, the charging base controller requests the BMS to acquire the related information of the battery;
BMS feeds back battery pack information required by charging base control;
the charging base controller requests the BMS to send the working state information of the battery pack after the verification is completed;
the BMS feeds back information required by the charging base controller, and the charging base controller judges that the battery pack is firmly connected after verification is correct;
(3) Judging by checking the voltage of the battery pack:
the charging base controller 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) manner, the charging base controller 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 safety authentication and key matching of the charging base controller and the BMS includes the steps of:
the charging base controller sends a request seed to the BMS for safety authentication;
the BMS feeds back seeds to the charging base controller for safety authentication;
the charging base controller transmits a key to the BMS;
the BMS calculates a secret key and matches the secret key of the charging base controller, and sends a matching result to the charging base controller;
in the (2) mode, after the matching is successful, the charging base controller requests the BMS to acquire the related information of the battery, including battery manufacturer and number information;
the charging base controller requests the BMS to send working state information of the battery pack after the verification is completed, wherein the working state information comprises battery pack electric quantity, electric 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202010449291.8A CN111638467B (en) | 2020-05-25 | 2020-05-25 | Method for identifying whether connection between detachable battery pack and external charging base is firm |
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| CN202010449291.8A CN111638467B (en) | 2020-05-25 | 2020-05-25 | Method for identifying whether connection between detachable battery pack and external charging base is firm |
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| CN111638467A CN111638467A (en) | 2020-09-08 |
| CN111638467B true CN111638467B (en) | 2023-09-22 |
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2020
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| CN106926737A (en) * | 2017-04-21 | 2017-07-07 | 阿尔特汽车技术股份有限公司 | Electric automobile DC charging connects check system and method |
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| CN111638467A (en) | 2020-09-08 |
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