CN215752028U - Wake-up source determining device of battery management system - Google Patents

Wake-up source determining device of battery management system Download PDF

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CN215752028U
CN215752028U CN202122296568.0U CN202122296568U CN215752028U CN 215752028 U CN215752028 U CN 215752028U CN 202122296568 U CN202122296568 U CN 202122296568U CN 215752028 U CN215752028 U CN 215752028U
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wake
circuit
resistor
resistors
signal
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赵雪明
杨红新
张建彪
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Svolt Energy Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The utility model discloses a battery management system awakening source determining device, which comprises: the power supply chip is provided with a wake-up port for detecting a plurality of wake-up sources; a wake-up circuit comprising a plurality of resistors connected in series; the wake-up circuit comprises a wake-up device, a plurality of wake-up switches and a control circuit, wherein the wake-up device is internally provided with the wake-up switches, one end of each wake-up switch is connected with a wake-up port, and the other end of each wake-up switch is connected with the input ends of different resistors except a first resistor in the wake-up circuit; and the first end of the control unit is connected with the power supply chip, and the second end of the control unit is connected with the input ends of other resistors except the first resistor and the resistor connected with the plurality of wake-up signals in the wake-up circuit. The utility model can simply, quickly and accurately determine the type of the wake-up signal and solve the problem of complex codes and logic caused by designing an acquisition circuit aiming at each wake-up signal by the traditional wake-up source determining device.

Description

Wake-up source determining device of battery management system
Technical Field
The utility model relates to the technical field of new energy automobile electronic circuits, in particular to a battery management system awakening source determining device.
Background
The BMS (battery management system) is equivalent to the brain of the power battery pack, and the BMS collects data of all ports, analyzes and processes the data, so that the safe and efficient work of the power battery is realized. In the case of connecting the storage battery to supply 12V of normal electricity, the operation mode includes two modes, namely a normal operation mode and a low power consumption mode, and the low power consumption mode is also called a sleep mode. In a parking state, the BMS and other ECUs may enter a sleep mode through a network management function, aiming to reduce power consumption of the battery pack and the storage battery.
The normal operation mode and the sleep mode of the BMS are implemented by a power supply chip (SBC). The SBC has 4I/O ports, two of which are used for the FCCU of the MCU to realize the soft reset function of software, and the other two ports (I/O0 and I/O4) are used for detecting an external wake-up source.
After the BMS enters the sleep mode, there are various ways to wake up the BMS, such as a key (KL15), a vehicle network message signal (CAN), a quick-charge gun signal (a +), a quick-charge gun connection signal (CC2), a bidirectional wake-up signal (FAULT) of a front-end acquisition chip, and the like. These wake-up signals are connected to two I/O ports of the SBC, and when any one of the wake-up signals is triggered, the level of the I/O port is pulled high, so as to wake up the BMS.
For the BMS, the occurrence of a wake-up source corresponds to the triggering of a function, for example, when a FAULT signal occurs, the input acquisition chip reports an error. When the A + signal exists, the vehicle with the meter can have a charging request. However, the contradiction is that the specific wake-up signal cannot be accurately determined due to the small number of I/O ports of the SBC, so the BMS must design a circuit for each signal of the wake-up source and perform signal acquisition through the pins of the MCU to determine the specific wake-up source.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the present invention is to overcome the problems of the existing battery management system wake-up source determining device that uses numerous MCU pins and the resulting code and logic are complex, thereby providing a battery management system wake-up source determining device.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the embodiment of the utility model provides a battery management system awakening source determining device, which comprises:
the power supply chip is provided with a wake-up port for detecting a plurality of wake-up sources;
a wake-up circuit comprising a plurality of resistors connected in series;
the wake-up circuit comprises a wake-up device, a plurality of wake-up switches and a control circuit, wherein the wake-up device is internally provided with the wake-up switches, one end of each wake-up switch is connected with a wake-up port, and the other end of each wake-up switch is connected with the input ends of different resistors except a first resistor in the wake-up circuit;
and the first end of the control unit is connected with the power supply chip, and the second end of the control unit is connected with the input ends of other resistors except the first resistor and the resistor connected with the plurality of wake-up signals in the wake-up circuit.
Optionally, the number of the wake-up ports is at least two, and the number of the wake-up circuits is one; the number of the resistors in the wake-up circuit is more than or equal to the number of all wake-up sources contained in all wake-up ports plus 2.
Optionally, the number of the wake-up ports and the number of the wake-up circuits are at least two, the wake-up ports correspond to the wake-up circuits one to one, and the number of the resistors in each wake-up circuit is greater than or equal to the number of the wake-up sources included in the wake-up port corresponding to the wake-up circuit plus 2.
Optionally, the number of wake-up ports is two.
Optionally, the resistors connected in series in the wake-up circuit have equal resistance values.
Optionally, the number of resistors in the wake-up circuit is equal to the number of wake-up sources plus 2.
Optionally, a second end of the control unit is connected to an input end of a last resistor in the wake-up circuit, and the plurality of wake-up signals are respectively connected to an input end of a second resistor to an input end of a penultimate resistor.
Optionally, the second terminal of the control unit is an ADC pin.
Optionally, an input port is further provided on the power supply chip.
Optionally, the wake-up signal includes at least two of: a key (KL15) signal, a CAN signal, a quick charging gun (A +) signal, a CC2 signal, a FAULT signal of an input acquisition chip and the like.
The technical scheme of the utility model has the following advantages:
1. under the condition that the I/O port resources of the power supply chip are insufficient, the wake-up circuits corresponding to the wake-up sources are designed for the IO ports of the power supply chip, the wake-up signals corresponding to the wake-up sources are respectively connected to the input ends of different resistors in the wake-up circuits, the pins of the control unit are connected with the input ends of other resistors in the wake-up circuits except the first resistor and the resistor connected with the wake-up signals, and the types of the wake-up sources are determined through the difference of voltage values acquired by the pins;
2. the type of the awakening source is determined by changing the difference of the voltage values acquired by the pins, so that the method is simpler, quicker and more accurate than the traditional method;
3. when the types of the awakening source signals are increased, the utility model can enable new awakening source signals to be accessed to the input end of the divider resistor of the circuit by adding the divider resistor in the awakening circuit, thereby judging the types of the awakening source signals and having expandability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a wake-up source determination device of a battery management system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wake-up source determination device of a battery management system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wake-up source determination device of a battery management system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wake-up source determination device of a battery management system according to still another embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In describing the present invention, it is noted that the term "and/or" as used in this specification and the appended claims refers to and includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The present invention provides a wake-up source determination device for a battery management system, as shown in fig. 1, the device includes:
the power supply chip 11 is provided with a wake-up port for detecting a plurality of wake-up sources;
a wake-up circuit 13 comprising a plurality of resistors connected in series;
a plurality of wake-up switches are arranged in the wake-up device 14, one end of each wake-up switch is connected with the wake-up port, and the other end of each wake-up switch is connected with the input ends of different resistors except the first resistor in the wake-up circuit;
and the first end of the control unit is connected with the power supply chip, and the second end of the control unit is connected with the input ends of other resistors in the awakening circuit except the first resistor and the resistor connected with the plurality of awakening signals.
Illustratively, as an embodiment of the present invention, the number of the wake-up ports is at least two, and the wake-up port connection wake-up circuit may be increased to determine the type of the wake-up signal as the number of the wake-up signals increases, where the number of the connected wake-up circuits is one; the number of the resistors in the wake-up circuit is greater than or equal to the number of all wake-up sources contained in all wake-up ports plus 2, one of the resistors is used for connecting the control unit to acquire voltage, the other resistor can be used for voltage division so as to conveniently calculate the voltage value acquired by the ADC pin of the control unit, and the specific connection can be as shown in FIG. 2.
Illustratively, as an embodiment of the present invention, the number of the wake-up ports and the number of the wake-up circuits are at least two, the wake-up ports are connected to the wake-up circuits in a one-to-one correspondence, the number of the resistors in each wake-up circuit is greater than or equal to the number of the wake-up sources included in the wake-up port corresponding to the wake-up circuit plus 2, and the specific connection may be as shown in fig. 3.
Preferably, the resistors connected in series in the wake-up circuit have equal resistance values, the resistors connected in series in the wake-up circuit may have unequal resistance values, and the equal resistance values may facilitate determination of a divided voltage value, so that the type of the wake-up source signal may be determined simply, quickly and accurately.
The number of the resistors in the wake-up circuit is equal to the number of the wake-up sources plus 2, wherein one resistor is used for connecting the control unit to collect voltage.
The second end of the control unit is connected with the input end of the last resistor in the wake-up circuit, and the plurality of wake-up signals are respectively connected with the input end of the second resistor to the input end of the penultimate resistor. And the second end of the control unit is an ADC pin and is used for acquiring the voltage value of the input end of the resistor connected with the ADC pin. And the power supply chip is also provided with an input port. The wake-up signal includes at least two of: a key (KL15) signal, a CAN signal, a quick charging gun (A +) signal, a CC2 signal, a FAULT signal of an input acquisition chip and the like.
Illustratively, in some embodiments of the present invention, as shown in fig. 3, the power supply chip 11 is provided with a wake-up port 15 and a wake-up port 18 for detecting a plurality of wake-up sources; the wake-up circuit 13 comprises a resistor 21, a resistor 22, a resistor 23, a resistor 24 and a resistor 25, one end 14 of the wake-up circuit 13 is connected to a voltage of 5V, the other end 19 of the wake-up circuit 13 is connected to a ground wire, the input end of the resistor 22 is connected to the wake-up switch 181, the wake-up switch 181 is connected to the wake-up port 18 of the power supply chip, the input end of the resistor 23 is connected to the wake-up switch 182, the wake-up switch 182 is connected to the wake-up port 18 of the power supply chip, the input end of the resistor 24 is connected to the wake-up switch 183, and the wake-up switch 183 is connected to the wake-up port 18 of the power supply chip; the first end of the control unit 12 is connected to the power supply chip 11, and the second end of the control unit 12 is connected to the input end of the resistor 25 in the wake-up circuit 13.
The external port 16 and the external port 17 in the power supply chip are used for controlling the FCCU of the unit 12 to implement a soft reset function of software. And the second end of the control unit is an ADC pin and is used for acquiring a voltage division value of the input end of the resistor 25 in the wake-up circuit 13.
Illustratively, in some embodiments of the present invention, the wake-up source ports are two wake-up ports 15 and 18, and the wake-up circuits are two, wherein one wake-up circuit 13 is connected to the wake-up port 18, and the other wake-up circuit is connected to the wake-up port 15 and has a similar form as the wake-up circuit 13, specifically, as shown in fig. 3, the wake-up port 15 of the power supply 11 is connected to a environmental switch 151 in the wake-up device, and the wake-up switch is connected to an input terminal of a resistor 21.
Wherein, the number of resistors in the wake-up circuit 13 is equal to the number of wake-up source signals 3 plus 2 to 5, and the resistance value of the resistor in the wake-up circuit 13 is R21＝R22＝R23＝R24＝R25。
When any one of the wake-up port 15 and the wake-up port 18 is in a high level state, the power supply chip 11 supplies power to the control unit 12 normally, so that the control unit 12 is in a normal working state; when the wake-up ports 15 and 18 are in the low level state, the power supply chip 11 stops supplying power to the control unit 12, and the battery management system BMS enters the sleep state.
Illustratively, in some embodiments of the present invention, when the wake-up source signal is determined, the wake-up source signal is respectively connected in parallel to a 5V voltage divider circuit, which wake-up source signal is incorporated into the circuit is determined by a voltage dividing value of a terminal resistor, and the determination of the wake-up source signal is performed in combination with the level states of the wake-up port 15 and the wake-up port 18 of the power supply chip 11, and when both the wake-up port 15 and the wake-up port 18 are at a low level, the BMS is in a sleep state; when the wake-up port 15 is in a high level state, the wake-up port is a wake-up source connected to the wake-up port 15; when the wake-up port 18 is in a high level state, it is a wake-up source connected to the wake-up port 18, so as to solve the problem that the specific signal source cannot be determined due to different connection wake-up ports but the same voltage division value.
Wherein, BMS is under the dormancy state, and wake-up circuit 13 leads to 5V voltage, and the port 18 awaken-up switch that awakens up in the awakening device 14 of power supply chip 11 all does not put through, is in low level state, and known by series connection partial pressure principle, the voltage that the ADC pin of the control unit 12 gathered is
Figure BDA0003273632240000061
When the BMS receives a FAULT signal of the input acquisition chip, the wake-up port 18 of the power supply chip 11 is pulled high, the wake-up switch 181 is closed, that is, the circuit connected to the input of the resistor 22 is turned on, and the input of the resistor 22 in the wake-up circuit 13 inputs a voltage of 5V, as known from the principle of serial voltage division, the voltage acquired by the ADC pin of the control unit 12 is
Figure BDA0003273632240000071
When the BMS receives a key (KL15) wake-up signal, the wake-up port of the power supply chip 11 is pulled high, the wake-up switch 182 is closed, that is, the circuit connected to the input terminal of the resistor 23 is turned on, the voltage of 5V is input to the input terminal of the resistor 23 in the serial voltage dividing circuit, and as can be seen from the principle of serial voltage division, the voltage collected by the ADC pin of the control unit 12 is
Figure BDA0003273632240000072
When the BMS receives a signal of a fast charging gun (a +), the wake-up port 18 of the power supply chip 11 is pulled high, the wake-up switch 183 is turned on, that is, the circuit connected to the input terminal of the resistor 24 is turned on, and the input terminal of the resistor 24 in the series voltage dividing circuit inputs a voltage of 5V, as known from the principle of series voltage division, the voltage collected by the ADC pin of the control unit 12 is
Figure BDA0003273632240000073
It can be found that when the voltage collected by the ADC pin of the control unit 12 is 1V, it can be determined that the BMS is in a sleep state; when the voltage collected by the ADC pin of the control unit 12 is 2.25V, it may be determined that the wake-up signal to wake up the BMS is a FAULT signal of the input collection chip; when the voltage collected by the ADC pin of the control unit 12 is 2.67V, it may be determined that the wake-up signal waking up the BMS is a key (KL15) signal; when the voltage collected by the ADC pin of the control unit 12 is 3.5V, it can be determined that the wake-up signal for waking up the BMS is a fast gun (a +) signal.
The wake-up source type is determined according to the difference of the voltage values acquired by the pins, so that compared with the traditional circuit, the wake-up source type wake-up circuit saves hardware resources and code amount, facilitates the realization of complex functions, and is simpler, quicker and more accurate.
Optionally, the wake-up port 15 of the power supply chip may be connected with other wake-up sources and wake-up circuits, so as to determine other signals including, but not limited to, a CAN wake-up signal, a CC2 wake-up signal, and the like.
For example, the wake-up circuit connected to the wake-up port 15 of the power supply chip may have a series resistor 31 and R connected between the wake-up circuit 13 and the power supply 14 as shown in fig. 231＝R21When receiving the wake-up source signal 151, the wake-up port 15 of the power supply chip 11 is pulled high, the wake-up switch 151 is turned on, that is, the circuit connected to the input terminal of the resistor 21 is turned on, and the input terminal of the resistor 31 in the serial voltage dividing circuit inputs 5V voltage, as known from the serial voltage dividing principle, the voltage collected by the ADC pin of the control unit 12 is the voltage collected by the ADC pin
Figure BDA0003273632240000074
Therefore, when the voltage collected by the ADC pin of the control unit 12 is 1.83V, it is determined that the wake-up signal for waking up the BMS is the input end wake-up signal 151.
For example, the wake-up circuit connected to the wake-up port 15 of the power supply chip may be connected to the wake-up circuit 45 at the wake-up port 15 as shown in fig. 4, where R is41＝R42＝R43When the BMS receives the wake-up signal 152 of the input acquisition chip, the wake-up port 15 of the power supply chip 11 is pulled high, the wake-up switch 152 is turned on, that is, the circuit connected to the input of the resistor 42 is turned on, the input of the resistor 42 in the wake-up circuit 45 inputs 3V voltage, according to the principle of serial voltage division, the voltage acquired by the ADC pin of the control unit 12 is
Figure BDA0003273632240000081
Therefore, when the voltage collected by the ADC pin of the control unit 12 is 2.5V, it is determined that the wake-up signal for waking up the BMS is the input end wake-up signal 152.
The utility model adds the divider resistor in the wake-up circuit to enable a new wake-up source signal to be accessed to the input end of the divider resistor of the circuit, thereby judging the type of the wake-up source signal and having expandability.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims (10)

1. A battery management system wake-up source determining apparatus, comprising:
the power supply chip is provided with a wake-up port for detecting a plurality of wake-up sources;
a wake-up circuit comprising a plurality of resistors connected in series;
the wake-up circuit comprises a wake-up device, a plurality of wake-up switches and a control circuit, wherein the wake-up device is internally provided with the wake-up switches, one end of each wake-up switch is connected with a wake-up port, and the other end of each wake-up switch is connected with the input ends of different resistors except a first resistor in the wake-up circuit;
and the first end of the control unit is connected with the power supply chip, and the second end of the control unit is connected with the input ends of other resistors except the first resistor and the resistor connected with the plurality of wake-up signals in the wake-up circuit.
2. The apparatus of claim 1, wherein the number of wake-up ports is at least two, and the number of wake-up circuits is one; the number of the resistors in the wake-up circuit is more than or equal to the number of all wake-up sources contained in all wake-up ports plus 2.
3. The apparatus of claim 1, wherein the number of the wake-up ports and the number of the wake-up circuits are at least two, the wake-up ports correspond to the wake-up circuits one to one, and the number of resistors in each wake-up circuit is greater than or equal to 2 plus the number of wake-up sources included in the wake-up port corresponding to the wake-up circuit.
4. The apparatus of claim 2 or 3, wherein the number of wake-up ports is two.
5. The apparatus of claim 1, wherein: the resistance values of a plurality of resistors connected in series in the wake-up circuit are equal.
6. The apparatus of claim 1, wherein: the number of resistors in the wake-up circuit is equal to the number of wake-up sources plus 2.
7. The apparatus of claim 6, wherein: the second end of the control unit is connected with the input end of the last resistor in the wake-up circuit, and the plurality of wake-up signals are respectively connected with the input end of the second resistor to the input end of the penultimate resistor.
8. The apparatus of claim 1, wherein the second terminal of the control unit is an ADC pin.
9. The device of claim 1, wherein a reset port is further provided on the power supply chip.
10. The apparatus of claim 1, wherein the wake-up signal comprises at least two of: the system comprises a key signal, a vehicle network message signal, a quick charging gun connection signal, a bidirectional awakening signal of a front-end acquisition chip and the like.
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