CN106169788A - Battery management unit, power supply method of battery management unit and battery system - Google Patents
Battery management unit, power supply method of battery management unit and battery system Download PDFInfo
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- CN106169788A CN106169788A CN201610563375.8A CN201610563375A CN106169788A CN 106169788 A CN106169788 A CN 106169788A CN 201610563375 A CN201610563375 A CN 201610563375A CN 106169788 A CN106169788 A CN 106169788A
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- 238000002955 isolation Methods 0.000 claims abstract description 31
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- 230000006870 function Effects 0.000 description 22
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- 230000009286 beneficial effect Effects 0.000 description 6
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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Abstract
The embodiment of the invention provides a battery management unit, a power supply method of the battery management unit and a battery system. The power supply method of the battery management unit in the embodiment of the invention is applied to the battery management unit comprising an isolation direct current converter, a Controller Area Network (CAN) converter, a non-isolation direct current converter, a logic chip and a first load; the isolation direct current converter, the non-isolation direct current converter and the first load respectively acquire electric energy of the battery pack from the battery pack, then the isolation direct current converter converts voltage of the acquired electric energy and provides the electric energy for the CAN converter by using the converted voltage, and then the non-isolation direct current converter converts the voltage of the acquired electric energy and provides the electric energy for the logic chip by using the converted voltage after receiving the wake-up signal. The technical scheme provided by the embodiment of the invention solves the problems of complex circuit structure, electric quantity waste and cost loss caused by using an additional power supply to supply power to the battery management unit in the prior art.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a battery management unit, a power supply method of the battery management unit and a battery system.
[ background of the invention ]
At present, a battery system mainly includes a battery pack, a battery management unit and a load, the battery pack only provides power for the load through the battery management unit, but does not provide power for electronic components in the battery management unit, so the power of the battery management unit is generally provided through an additional power supply outside the battery system.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the prior art, an extra power supply outside a battery system generally provides electric energy for a battery management unit in the battery system, and functional designs such as electrostatic impedance protection, large-current injection protection, overvoltage protection, undervoltage protection, reverse connection protection, quiescent current control and the like of a power supply port need to be considered, so that the circuit structure is complex, and electric quantity waste and cost loss are caused.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a battery management unit, a power supply method of the battery management unit, and a battery system, so as to solve the problems of complex circuit structure, power waste, and cost loss caused by using an additional power supply to supply power to the battery management unit in the prior art.
In one aspect, an embodiment of the present invention provides a battery management unit, where the battery management unit includes an isolated dc converter, a Controller Area Network (CAN) converter, a non-isolated dc converter, a logic chip, and a first load; wherein,
the input end of the isolation direct current converter is connected with the battery pack, the first output end of the isolation direct current converter is grounded, the second output end of the isolation direct current converter is connected with the input end of the CAN converter, and the first output end of the CAN converter is grounded;
the first input end of the non-isolated direct current converter is connected with the battery pack, the first output end of the non-isolated direct current converter is grounded, the second output end of the non-isolated direct current converter is connected with the input end of the logic chip, and the output end of the logic chip is grounded;
the input end of the first load is connected with the battery pack, and the output end of the first load is grounded.
In the aspect and any possible implementation manner described above, an implementation manner is further provided, where if the CAN converter does not have a wake-up function, the battery management unit further includes a wake-up chip; wherein,
the input end of the awakening chip is connected with the third output end of the isolation direct current converter, and the first output end of the awakening chip is grounded.
The above-described aspect and any possible implementation manner further provide an implementation manner that the second output terminal of the wake-up chip is connected to the second input terminal of the non-isolated dc converter.
The above aspect and any possible implementation manner further provide an implementation manner, if the CAN converter has a wake-up function, the second output terminal of the CAN converter is connected to the second input terminal of the non-isolated dc converter.
The above aspect and any possible implementation manner further provide an implementation manner, in which the battery management unit further includes a second load; wherein,
the input end of the second load is connected with the third output end of the non-isolated direct current converter, and the output end of the second load is grounded.
The above-described aspects and any possible implementation further provide an implementation in which the second load includes at least one of a logic circuit, a control chip, a driving circuit, and other electronic components.
One of the above technical solutions has the following beneficial effects:
according to the battery management unit provided by the embodiment of the invention, through the improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, the battery pack in the battery system provides electric energy for the battery management unit in the battery system, the complex circuit structure which needs to be considered when the additional power supply outside the battery system supplies power to the battery management unit is avoided, and the circuit structure inside the battery management unit is effectively simplified, so that the unnecessary electric quantity waste is avoided, the equipment cost and the power supply cost are saved, and further, the problems of complex circuit structure, electric quantity waste and cost loss caused by the fact that the additional power supply is used for supplying power to the battery management unit in the prior art are solved.
On the other hand, the embodiment of the invention provides a power supply method of a battery management unit, which is applied to the battery management unit comprising an isolation direct current converter, a Controller Area Network (CAN) converter, a non-isolation direct current converter, a logic chip and a first load;
the method comprises the following steps:
the isolated direct current converter, the non-isolated direct current converter and the first load respectively obtain electric energy of a battery pack from the battery pack;
the isolation direct current converter converts the voltage of the acquired electric energy and provides the electric energy for the CAN converter by using the converted voltage;
and the non-isolated direct current converter converts the acquired voltage of the electric energy after receiving the wake-up signal and provides the electric energy for the logic chip by using the converted voltage.
In the aspect and any possible implementation manner described above, an implementation manner is further provided, where if the CAN converter does not have a wake-up function, the battery management unit further includes a wake-up chip;
the method further comprises the following steps:
the isolation direct current converter also provides electric energy for the awakening chip by using the converted voltage.
As to the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner, where after receiving the wake-up signal, the non-isolated dc converter performs voltage conversion on the acquired electric energy, and provides the electric energy to the logic chip by using the converted voltage, including:
the non-isolated direct current converter receives a wake-up signal sent by the wake-up chip;
the non-isolated direct current converter converts the acquired voltage of the electric energy and provides the electric energy for the logic chip by using the converted voltage.
The above aspects and any possible implementation further provide an implementation if the CAN converter has a wake-up function;
after the non-isolated DC converter receives the wake-up signal, the voltage conversion is carried out on the acquired electric energy, and the converted voltage is used for providing electric energy for the logic chip, and the method comprises the following steps:
the non-isolated direct current converter receives a wake-up signal sent by the CAN converter;
the non-isolated direct current converter converts the acquired voltage of the electric energy and provides the electric energy for the logic chip by using the converted voltage.
The above aspect and any possible implementation manner further provide an implementation manner, in which the battery management unit further includes a second load;
the method further comprises the following steps:
and after receiving the wake-up signal, the non-isolated direct current converter also provides electric energy for the second load by using the converted voltage.
The above-described aspects and any possible implementation further provide an implementation in which the second load includes at least one of a logic circuit, a control chip, a driving circuit, and other electronic components.
One of the above technical solutions has the following beneficial effects:
according to the power supply method of the battery management unit provided by the embodiment of the invention, through improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, the battery pack in the battery system supplies electric energy to the battery management unit in the battery system, a complex circuit structure which needs to be considered when the battery management unit is supplied with power by the additional power supply outside the battery system is avoided, and the circuit structure inside the battery management unit is effectively simplified, so that unnecessary electric quantity waste is avoided, the equipment cost and the power supply cost are saved, and further, the problems of complex circuit structure, electric quantity waste and cost loss caused by the fact that the additional power supply is used for supplying power to the battery management unit in the prior art are solved.
In another aspect, an embodiment of the present invention provides a battery system, which includes a battery pack and the above battery management unit.
The above aspects and any possible implementations further provide an implementation in which the battery system further includes a load;
the output end of the battery pack is connected with the input end of the battery management unit;
the output end of the battery management unit is connected with the input end of the load.
One of the above technical solutions has the following beneficial effects:
according to the battery system provided by the embodiment of the invention, through the improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, the battery pack in the battery system provides electric energy for the battery management unit in the battery system, the complex circuit structure which needs to be considered when the battery management unit is supplied with power by the additional power supply outside the battery system is avoided, and the circuit structure inside the battery management unit is effectively simplified, so that the unnecessary electric quantity waste is avoided, the equipment cost and the power supply cost are saved, and further, the problems of complex circuit structure, electric quantity waste and cost loss caused by the fact that the additional power supply is used for supplying power to the battery management unit in the prior art are solved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a first embodiment of a battery management unit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a second embodiment of a battery management unit according to the present invention;
fig. 3 is a schematic flowchart of a power supply method of a battery management unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a battery system according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the input, output, and load in embodiments of the present invention, these inputs, outputs, and loads should not be limited to these terms. These terms are only used to distinguish the input, output and load from each other.
For example, a first input may also be referred to as a second input, and similarly, a second input may also be referred to as a first input, without departing from the scope of embodiments of the present invention.
Alternatively, for another example, the first output terminal may also be referred to as the second output terminal, and similarly, the second output terminal may also be referred to as the first output terminal, without departing from the scope of the embodiments of the present invention.
Alternatively, for another example, the first load may also be referred to as a second load, and similarly, the second load may also be referred to as a first load, without departing from the scope of embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Example one
Fig. 1 is a schematic circuit structure diagram of a battery management unit according to a first embodiment of the present invention.
As shown in fig. 1, the battery management unit includes: an isolated dc converter 11, a Controller Area Network (CAN) converter 12, a non-isolated dc converter 13, a logic chip 14, and a first load 15. Where GND shown in fig. 1 represents ground.
Specifically, as shown in fig. 1, an input end of the isolated dc converter 11 is connected to the battery pack, a first output end of the isolated dc converter 11 is grounded, a second output end of the isolated dc converter 11 is connected to an input end of the CAN converter 12, and a first output end of the CAN converter 12 is grounded.
Specifically, as shown in fig. 1, in the embodiment of the present invention, the isolation dc converter 11 is configured to obtain electric energy from a battery pack in the battery system, and convert a voltage of the obtained electric energy, and further, the isolation dc converter 11 provides electric energy to the CAN converter 12 by using the converted voltage.
As shown in fig. 1, a first input end of the non-isolated dc converter 13 is connected to the battery pack, a first output end of the non-isolated dc converter 13 is grounded, a second output end of the non-isolated dc converter 13 is connected to an input end of the logic chip 14, and an output end of the logic chip 14 is grounded;
specifically, as shown in fig. 1, in the embodiment of the present invention, the non-isolated dc converter 13 is configured to obtain electric energy from a battery pack in the battery system, and convert a voltage of the obtained electric energy, and further, after receiving the wake-up signal, the non-isolated dc converter 13 may provide the electric energy to the logic chip 14 by using the converted voltage.
As shown in fig. 1, the input terminal of the first load 15 is connected to the battery pack, and the output terminal of the first load 15 is grounded. It will be appreciated that the power of the first load 15 is directly supplied by the battery pack of the battery system, i.e. the supply voltage of the first load 15 is directly supplied without conversion. In one particular implementation, the first load 15 may include, but is not limited to, at least one of a fan and other electronic components.
It can be understood that, as shown in fig. 1, the voltage of the electric energy provided by the battery pack is different from the voltage of the electric energy converted by the isolated dc converter 11; and the voltage of the electric energy supplied by the battery pack is also different from the voltage of the electric energy converted by the non-isolated dc converter 13.
It should be noted that the voltage of the electric energy provided by the battery pack may be determined according to actual needs, and this is not particularly limited in the embodiment of the present invention. Specifically, the voltage of the electric power supplied from the battery pack may vary within a voltage range of 36V to 60V. For example, in one particular implementation, the voltage of the electrical energy provided by the battery pack may be 48V.
As shown in fig. 1, the voltage obtained by converting the voltage of the acquired electric energy by the isolated dc converter 11 and the voltage obtained by converting the voltage of the acquired electric energy by the non-isolated dc converter 13 may be preset according to actual needs, and this is not particularly limited in the embodiment of the present invention. The voltage obtained by converting the voltage of the acquired electric energy by the isolated dc converter 11 and the voltage obtained by converting the voltage of the acquired electric energy by the non-isolated dc converter 13 may be the same or different, and the embodiment of the present invention is not particularly limited thereto.
In a specific implementation process, as shown in fig. 1, the voltage obtained by converting the voltage of the obtained electric energy by the isolated dc converter 11 may be preset to be 12V in consideration of the voltage range of the electronic components inside the battery management unit.
In a specific implementation process, as shown in fig. 1, the voltage obtained by converting the voltage of the obtained electric energy by the non-isolated dc converter 13 may be preset to be 12V in consideration of the voltage range of the electronic components inside the battery management unit.
Specifically, as shown in fig. 1, in the embodiment of the present invention, the isolated dc converter 11 may directly obtain electric energy from the battery pack to supply power to itself; furthermore, the isolated dc converter 11 CAN directly convert the voltage of the electric energy obtained from the battery pack, and further supply the electric energy to the CAN converter 12 by using the converted voltage.
Specifically, as shown in fig. 1, in the embodiment of the present invention, the non-isolated dc converter 13 may directly obtain electric energy from the battery pack to supply power to itself; however, the non-isolated dc converter 13 will only operate after receiving the wake-up signal. That is, the non-isolated dc converter 13 converts the voltage of the electric energy obtained from the battery pack only after receiving the wake-up signal, and then supplies the electric energy to the logic chip 14 by using the converted voltage. That is, if the non-isolated dc converter 13 does not receive the wake-up signal, the non-isolated dc converter 13 does not convert the voltage of the electric energy obtained from the battery pack, and thus cannot provide the electric energy to the logic chip 14.
It should be noted that, as shown in fig. 1, the power supply from the isolated dc converter 11 to the CAN converter 12 CAN be performed without interruption, while the power supply from the non-isolated dc converter 13 to the logic chip 14 is performed after the condition of receiving the wake-up signal is satisfied. Therefore, uninterrupted electric energy is provided for the CAN converter 12 through the isolated direct current converter 11, the normal operation of the CAN converter 12 is ensured, and the information interaction between the battery management unit and an external controller is further ensured; the non-isolated dc converter 13 does not work before receiving the wake-up signal, and the logic chip 14 and other electronic components powered by the non-isolated dc converter 13 also do not work, so that power resources are effectively saved, and unnecessary power waste is avoided.
Specifically, the battery management unit provided by the embodiment of the present invention may further include a wake-up chip and a second load. Fig. 2 is a schematic circuit diagram of a battery management unit according to a second embodiment of the present invention. As shown in fig. 2, the battery management unit includes: an isolated dc converter 11, a CAN converter 12, a non-isolated dc converter 13, a logic chip 14, a first load 15, a wake-up chip 16 and a second load 17. Where GND shown in fig. 2 represents ground.
Specifically, as shown in fig. 2, in the embodiment of the present invention, a battery pack in the battery system may directly provide electric energy for the isolated dc converter 11, the non-isolated dc converter 13, and the first load 17; the isolated dc converter 11 provides electric energy for the CAN converter 12 and the wake-up chip 16 by using the converted voltage; after receiving the wake-up signal, the non-isolated dc converter 13 provides power to the logic chip 14 and the second load 17 by using the converted voltage.
In the embodiment of the present invention, the wake-up signal received by the non-isolated dc converter 13 may include, but is not limited to, the following two cases.
First, if the CAN converter 12 does not have the wake-up function, as shown in fig. 2, the battery management unit further includes a wake-up chip 16, and the non-isolated dc converter 13 receives a wake-up signal sent by the wake-up chip 16.
It should be noted that, as shown in fig. 2, in the embodiment of the present invention, the CAN converter 12 does not have a wake-up function, and may be that the CAN converter 12 does not have a function of receiving a wake-up signal sent by an external controller of the battery system; alternatively, the CAN converter 12 may not have a function of transmitting the wake-up signal to the non-isolated dc converter 13. At this time, the wake-up chip 16, which needs to have a wake-up function, receives a wake-up signal transmitted from the external controller of the battery system, and transmits the received wake-up signal to the non-isolated dc converter 13. Wherein the wake-up signal is used to wake up the non-isolated dc converter 13 to operate.
In a specific implementation process, as shown in fig. 2, an input end of the wake-up chip 16 is connected to the third output end of the isolated dc converter 11, and a first output end of the wake-up chip 16 is grounded. Specifically, a second output terminal of the wake-up chip 16 is connected to a second input terminal of the non-isolated dc converter 13.
It will be appreciated that the power for waking up the chip 16 is provided by the isolated dc converter 11 in the battery management unit using the converted voltage, as shown in fig. 2.
Secondly, if the CAN converter 12 has a wake-up function, as shown in fig. 1, the non-isolated dc converter 13 receives a wake-up signal sent by the CAN converter 12.
In a specific implementation, as shown in fig. 1, a second output terminal of the CAN converter 12 is connected to a second input terminal of the non-isolated dc converter 13.
As shown in fig. 1, in the embodiment of the present invention, the CAN converter 12 has a wake-up function, that is, the CAN converter 12 has a function of receiving a wake-up signal transmitted by an external controller of the battery system and a function of transmitting the received wake-up signal to the non-isolated dc converter 13. Wherein the wake-up signal is used to wake up the non-isolated dc converter 13 to operate.
In one specific implementation, to reduce unnecessary waste of power, the load of the isolated dc converter 11 may consider a minimum wake-up system. As shown in fig. 1, the isolated dc converter 11 only supplies power to the CAN converter 12, and the wake-up system in the battery management unit shown in fig. 1 only includes the CAN converter 12; alternatively, as shown in fig. 2, the isolated dc converter 11 only supplies power to the CAN converter 12 and the wake-up chip 16, and the wake-up system in the battery management unit shown in fig. 2 only includes the CAN converter 12 and the wake-up chip 16.
In particular, the isolated dc converter 11, the CAN converter 12 and the wake-up chip 16 may be selected to have as little static current as possible. Specifically, the input current of the isolated dc converter 11 is smaller, and the output current of the isolated dc converter 11 is also smaller, specifically, as shown in fig. 1, the output current of the isolated dc converter 11 may be hundreds of microamperes.
Specifically, as shown in fig. 2, in the embodiment of the present invention, the battery management unit may further include, but is not limited to, a second load 17.
In a specific implementation, as shown in fig. 2, an input terminal of the second load 17 is connected to the third output terminal of the non-isolated dc converter 13, and an output terminal of the second load 17 is grounded. That is, the non-isolated dc converter 13 may utilize the converted voltage to provide power to the second load 17 after receiving the wake-up.
Specifically, as shown in fig. 2, in the embodiment of the present invention, the second load 17 may include, but is not limited to, at least one of a logic circuit, a control chip, a driving circuit, and other electronic components.
It should be noted that, as shown in fig. 2, in the embodiment of the present invention, the voltage used by the first load 15 is the voltage of the electric energy provided by the battery pack in the battery system, and the voltage used by the second load 17 is the voltage converted by the non-isolated dc converter 13 in the battery management unit.
It will be appreciated that in one particular implementation, how power is supplied to the electronic components in the battery management unit may be determined based on the voltage used by the electronic components in the battery management unit.
For example, assume that the voltage of the power supplied by the battery pack is 48V, and the converted voltage of the non-isolated dc converter is 12V; if the voltage used by the fan in the battery management unit is 48V, the fan is directly powered by the battery pack, and at this time, the fan can be used as the first load 15; or, if the voltage used by the fan in the battery management unit is 12V, the fan may not be directly powered by the battery pack, but needs to be powered by the voltage converted by the non-isolated dc converter, and in this case, the fan may serve as the second load 17.
Alternatively, for example, a large-current driving circuit that cannot directly supply power from a voltage of 48V and needs to supply power from 12V belongs to the second load 17; and a large current driving circuit that can be directly supplied with a voltage of 48V may be used as the first load 15.
The battery management unit provided by the embodiment of the invention has the following beneficial effects:
according to the battery management unit provided by the embodiment of the invention, through the improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, and the battery pack in the battery system provides electric energy for the battery management unit in the battery system, so that a complex circuit structure which needs to be considered when the additional power supply outside the battery system supplies power to the battery management unit is avoided, the circuit structure inside the battery management unit is effectively simplified, further, unnecessary electric quantity waste is avoided, and the equipment cost and the power supply cost are saved.
Example two
Fig. 3 is a schematic flow chart of a power supply method for a battery management unit according to an embodiment of the present invention.
The power supply method of the battery management unit is applied to the battery management unit comprising an isolation direct current converter, a CAN converter, a non-isolation direct current converter, a logic chip and a first load;
as shown in fig. 3, the method includes:
s301, the isolated direct current converter, the non-isolated direct current converter and the first load respectively obtain electric energy from the battery pack.
The power for the isolated dc converter, the non-isolated dc converter and the first load is provided directly from the battery pack in the battery management unit. That is, the supply voltages of the isolated dc converter, the non-isolated dc converter and the first load are supplied directly without conversion.
In one particular implementation, the first load may include, but is not limited to, at least one of a fan and other electronic components.
It should be noted that the voltage of the electric energy provided by the battery pack may be determined according to actual needs, and this is not particularly limited in the embodiment of the present invention. Specifically, the voltage of the electric power supplied from the battery pack may vary within a voltage range of 36V to 60V. In one particular implementation, the voltage of the electrical energy provided by the battery pack may be 48V.
And S302, converting the voltage of the acquired electric energy by the isolated direct current converter, and providing the electric energy for the CAN converter by using the converted voltage.
Specifically, in the embodiment of the present invention, the isolation dc converter is configured to obtain electric energy from a battery pack in the battery system, convert a voltage of the obtained electric energy, and further provide the electric energy to the CAN converter by using the converted voltage.
It can be understood that the voltage of the electric energy provided by the battery pack is different from the voltage of the electric energy converted by the isolated dc converter.
It should be noted that the voltage of the electric energy converted by the isolated dc converter may be preset according to actual needs, and this is not particularly limited in the embodiment of the present invention.
In a specific implementation process, the voltage obtained by converting the voltage of the obtained electric energy by the isolated dc converter may be preset to be 12V in consideration of the voltage range of the electronic components inside the battery management unit.
Specifically, in the embodiment of the present invention, the output current of the isolated dc converter is small, and may be hundreds of microamperes.
In particular, isolating the load of the dc converter may allow for a minimal wake-up system. In a specific implementation process, the isolated dc converter only provides power to the CAN converter; or the isolated direct current converter only provides power for the CAN converter and the wake-up chip. Thus, the isolated dc converter, the CAN converter and the wake-up chip may be chosen to have as little static current as possible.
Specifically, in the embodiment of the invention, the isolated direct current converter can directly obtain electric energy from the battery pack to supply power for the isolated direct current converter; and the isolated direct current converter CAN directly convert the voltage of the electric energy acquired from the battery pack, and then the converted voltage is used for providing the electric energy for the CAN converter.
And S303, after receiving the wake-up signal, the non-isolated direct current converter converts the voltage of the acquired electric energy and provides the electric energy for the logic chip by using the converted voltage.
Specifically, in the embodiment of the present invention, the non-isolated dc converter is configured to obtain electric energy from a battery pack in the battery system, and convert a voltage of the obtained electric energy, and further, after receiving the wake-up signal, the non-isolated dc converter may provide the electric energy to the logic chip by using the converted voltage.
It is understood that the voltage of the electric energy provided by the battery pack is different from the voltage of the electric energy converted by the non-isolated dc converter. Specifically, the voltage of the electric energy converted by the non-isolated dc converter may be preset according to actual needs, which is not particularly limited in the embodiment of the present invention.
In a specific implementation process, in consideration of a voltage range of electronic components inside the battery management unit, a voltage obtained by converting the voltage of the obtained electric energy by the non-isolated dc converter may be preset to be 12V.
The voltage of the electric energy converted by the isolated dc converter may be the same as or different from the voltage of the electric energy converted by the non-isolated dc converter, and this is not particularly limited in the embodiment of the present invention.
Specifically, in the embodiment of the invention, the non-isolated dc converter can directly obtain electric energy from the battery pack to supply power to the non-isolated dc converter; however, the non-isolated dc converter will only operate after receiving the wake-up signal. That is, the non-isolated dc converter converts the voltage of the electric energy obtained from the battery pack only after receiving the wake-up signal, and then supplies the electric energy to the logic chip by using the converted voltage. That is, if the non-isolated dc converter does not receive the wake-up signal, the non-isolated dc converter does not convert the voltage of the acquired electric energy, and thus cannot provide the electric energy to the logic chip.
It should be noted that the isolation dc converter may supply power to the CAN converter without interruption, and the non-isolation dc converter may supply power to the logic chip only after receiving the wake-up signal. Therefore, uninterrupted electric energy is provided for the CAN converter through the isolated direct current converter, the normal operation of the CAN converter is ensured, and the information interaction between the battery management unit and an external controller is further ensured; the non-isolated direct current converter does not work before receiving the wake-up signal, and the logic chip and other electronic components powered by the non-isolated direct current converter also do not work, so that the electric energy resource is effectively saved, and unnecessary electric energy waste is avoided.
Specifically, in the embodiment of the present invention, the wake-up signal received by the non-isolated dc converter may include, but is not limited to, the following two cases.
First, if the CAN converter does not have a wake-up function, the battery management unit further includes a wake-up chip, and the non-isolated dc converter receives a wake-up signal sent by the wake-up chip.
It should be noted that, in the embodiment of the present invention, the CAN converter does not have a wake-up function, and may be a function that the CAN converter does not have a wake-up signal sent by the external controller of the battery system; alternatively, the CAN converter may not have a function of transmitting the wake-up signal to the non-isolated dc converter. At this time, the wake-up chip with the wake-up function is required to receive the wake-up signal sent by the external controller of the battery system and send the received wake-up signal to the non-isolated dc converter. The wake-up signal is used for waking up the non-isolated DC converter to work.
Specifically, the non-isolated dc converter receives the wake-up signal sent by the wake-up chip, and then converts the voltage of the obtained electric energy, and provides the electric energy for the logic chip by using the converted voltage.
In a specific implementation, the power for waking up the chip is provided by an isolated dc converter in the battery management unit using the converted voltage.
Secondly, if the CAN converter has the wake-up function, the non-isolated DC converter receives the wake-up signal sent by the CAN converter.
In the embodiment of the present invention, the CAN converter has a wake-up function, that is, the CAN converter has a function of receiving a wake-up signal transmitted by a controller outside the battery system, and further has a function of transmitting the received wake-up signal to the non-isolated dc converter. The wake-up signal is used for waking up the non-isolated DC converter to work.
Specifically, the non-isolated dc converter receives a wake-up signal sent by the CAN converter, and then converts the voltage of the obtained electric energy, and provides the electric energy for the logic chip by using the converted voltage.
Specifically, in the embodiment of the present invention, the battery management unit may further include a second load.
In a specific implementation, the non-isolated dc converter further provides power to the second load using the converted voltage after receiving the wake-up signal.
Specifically, in the embodiment of the present invention, the second load may include, but is not limited to, at least one of a logic circuit, a control chip, a driving circuit, and other electronic components.
It should be noted that, in the embodiment of the present invention, the voltage used by the first load is the voltage of the electric energy provided by the battery pack in the battery system, and the voltage used by the second load is the voltage converted by the non-isolated dc converter in the battery management unit.
It will be appreciated that in one particular implementation, how power is supplied to the electronic components in the battery management unit may be determined based on the voltage used by the electronic components in the battery management unit.
For example, assume that the voltage of the power supplied by the battery pack is 48V, and the converted voltage of the non-isolated dc converter is 12V; if the voltage used by the fan in the battery management unit is 48V, the fan is directly powered by the battery pack, and at the moment, the fan belongs to the first load; or, if the voltage used by the fan in the battery management unit is 12V, the fan may not be directly powered by the battery pack, but needs to be powered by the voltage converted by the non-isolated dc converter, and in this case, the fan belongs to the second load.
For parts of the present embodiment that are not described in detail, reference may be made to the description of fig. 1.
The power supply method of the battery management unit provided by the embodiment of the invention has the following beneficial effects:
according to the power supply method of the battery management unit provided by the embodiment of the invention, through improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, the battery pack in the battery system supplies electric energy to the battery management unit in the battery system, a complex circuit structure which needs to be considered when the battery management unit is supplied with power by the additional power supply outside the battery system is avoided, and the circuit structure inside the battery management unit is effectively simplified, so that unnecessary electric quantity waste is avoided, the equipment cost and the power supply cost are saved, and further, the problems of complex circuit structure, electric quantity waste and cost loss caused by the fact that the additional power supply is used for supplying power to the battery management unit in the prior art are solved.
EXAMPLE III
Fig. 4 is a schematic circuit diagram of a battery system according to an embodiment of the present invention.
As shown in fig. 4, the battery system includes a battery pack 41 and the above-described battery management unit 42.
Specifically, as shown in fig. 4, in the embodiment of the present invention, the battery system further includes a load 43; the output end of the battery pack 41 is connected with the input end of the battery management unit 42, and the output end of the battery management unit 42 is connected with the input end of the load 43.
Specifically, as shown in fig. 4, the direction of the arrow in the battery system indicates the flowing direction of the current, that is, the battery pack 41 in the battery system supplies the battery management unit 42 with the electric power, and supplies the load 43 with the electric power through the battery management unit 42.
For parts of the present embodiment that are not described in detail, reference may be made to the description of fig. 1 and 2.
The battery system provided by the embodiment of the invention has the following beneficial effects:
according to the battery system provided by the embodiment of the invention, through the improvement of the internal circuit in the battery management unit, the power supply of an additional power supply outside the battery system to the battery management unit is cancelled, the battery pack in the battery system provides electric energy for the battery management unit in the battery system, the complex circuit structure which needs to be considered when the battery management unit is supplied with power by the additional power supply outside the battery system is avoided, and the circuit structure inside the battery management unit is effectively simplified, so that the unnecessary electric quantity waste is avoided, the equipment cost and the power supply cost are saved, and further, the problems of complex circuit structure, electric quantity waste and cost loss caused by the fact that the additional power supply is used for supplying power to the battery management unit in the prior art are solved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A battery management unit is characterized by comprising an isolation direct current converter, a Controller Area Network (CAN) converter, a non-isolation direct current converter, a logic chip and a first load; wherein,
the input end of the isolation direct current converter is connected with the battery pack, the first output end of the isolation direct current converter is grounded, the second output end of the isolation direct current converter is connected with the input end of the CAN converter, and the first output end of the CAN converter is grounded;
the first input end of the non-isolated direct current converter is connected with the battery pack, the first output end of the non-isolated direct current converter is grounded, the second output end of the non-isolated direct current converter is connected with the input end of the logic chip, and the output end of the logic chip is grounded;
the input end of the first load is connected with the battery pack, and the output end of the first load is grounded.
2. The battery management unit of claim 1, wherein if the CAN converter does not have a wake-up function, the battery management unit further comprises a wake-up chip; wherein,
the input end of the awakening chip is connected with the third output end of the isolation direct current converter, and the first output end of the awakening chip is grounded.
3. The battery management unit of claim 2, wherein a second output of the wake-up chip is coupled to a second input of the non-isolated dc converter.
4. The battery management unit of claim 1, wherein the second output of the CAN converter is coupled to the second input of the non-isolated dc converter if the CAN converter has a wake-up function.
5. The battery management unit of claim 1, further comprising a second load; wherein,
the input end of the second load is connected with the third output end of the non-isolated direct current converter, and the output end of the second load is grounded.
6. The battery management unit of claim 5, wherein the second load comprises at least one of a logic circuit, a control chip, a driver circuit, and other electronic components.
7. A power supply method of a battery management unit is characterized by being applied to the battery management unit comprising an isolation direct current converter, a Controller Area Network (CAN) converter, a non-isolation direct current converter, a logic chip and a first load;
the method comprises the following steps:
the isolated direct current converter, the non-isolated direct current converter and the first load respectively obtain electric energy from a battery pack;
the isolation direct current converter converts the voltage of the acquired electric energy and provides the electric energy for the CAN converter by using the converted voltage;
and the non-isolated direct current converter converts the acquired voltage of the electric energy after receiving the wake-up signal and provides the electric energy for the logic chip by using the converted voltage.
8. The method of claim 7 wherein if the CAN converter does not have a wake-up function, the battery management unit further comprises a wake-up chip;
the method further comprises the following steps:
the isolation direct current converter also provides electric energy for the awakening chip by using the converted voltage.
9. The method of claim 8, wherein after receiving the wake-up signal, the non-isolated dc converter performs voltage conversion on the acquired electric energy, and provides electric energy for the logic chip by using the converted voltage, and the method comprises:
the non-isolated direct current converter receives a wake-up signal sent by the wake-up chip;
the non-isolated direct current converter converts the acquired voltage of the electric energy and provides the electric energy for the logic chip by using the converted voltage.
10. The method of claim 7 wherein if the CAN converter has a wake-up function;
after the non-isolated DC converter receives the wake-up signal, the voltage conversion is carried out on the acquired electric energy, and the converted voltage is used for providing electric energy for the logic chip, and the method comprises the following steps:
the non-isolated direct current converter receives a wake-up signal sent by the CAN converter;
the non-isolated direct current converter converts the acquired voltage of the electric energy and provides the electric energy for the logic chip by using the converted voltage.
11. The method of claim 7, wherein the battery management unit further comprises a second load;
the method further comprises the following steps:
and after receiving the wake-up signal, the non-isolated direct current converter also provides electric energy for the second load by using the converted voltage.
12. The method of claim 11, wherein the second load comprises at least one of a logic circuit, a control chip, a driver circuit, and other electronic components.
13. A battery system, characterized in that the battery system comprises a battery pack and a battery management unit according to any one of claims 1 to 6.
14. The battery system of claim 13, further comprising a load;
the output end of the battery pack is connected with the input end of the battery management unit;
the output end of the battery management unit is connected with the input end of the load.
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| CN106169788B (en) | 2018-12-21 |
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