CN112994191A - Current control unit, power supply unit and vehicle - Google Patents

Current control unit, power supply unit and vehicle Download PDF

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Publication number
CN112994191A
CN112994191A CN202110478122.1A CN202110478122A CN112994191A CN 112994191 A CN112994191 A CN 112994191A CN 202110478122 A CN202110478122 A CN 202110478122A CN 112994191 A CN112994191 A CN 112994191A
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China
Prior art keywords
module
sub
diode
power supply
diode module
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Granted
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CN202110478122.1A
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Chinese (zh)
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CN112994191B (en
Inventor
张金磊
曾炳光
刘涛
吴国华
朱建国
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Shenzhen Winline Technology Co Ltd
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Shenzhen Winline Technology Co Ltd
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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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention provides a current control unit, a power supply device and a vehicle, wherein the current control unit comprises a power supply module, a control module, a diode module, an output port and an input port, the control module is used for acquiring first temperature information of the diode module, and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module, thereby being beneficial to controlling the output current of an internal power supply module when supplying power to a load and reducing adverse effects on the service life and the safety of the power supply module caused by overlarge output current. The power supply device comprises M current control units, wherein the M current control units are connected in parallel and then charge to a load, the power supply device is simple in structure, a single device can use power supply modules with different types and different physical characteristics, the output current of the internal power supply module can be balanced by the device, and the service life, the safety and the reliability of the power supply device can be improved. The vehicle includes this power supply device.

Description

Current control unit, power supply unit and vehicle
Technical Field
The invention belongs to the field of electronics, and particularly relates to a current control unit, a power supply device and a vehicle.
Background
With the continuous revolution of lithium battery technology, the cost of the lithium battery is gradually reduced, and the application field of the lithium battery is more and more extensive. In the application of lithium batteries in various scenes, the parallel use is a conventional phenomenon. Through the parallel connection of the lithium batteries, the battery packs with various capacities for different application occasions can be designed. Under the general condition, the lithium cell group of same specification and same performance is parallelly connected and is used can not have the problem, but when parallelly connected lithium cell group comes from different manufacturers, there are multiple hidden dangers in the parallelly connected use of lithium cell group, especially when lithium cell group discharges, output current size between the different lithium cell groups is difficult unanimous, can lead to the output current of some lithium cell groups too big, arouse the damage of group battery, and simultaneously, also can bring the problem of lithium cell group safety of using, perhaps lead to the phenomenon of catching a fire even. How to realize the output current balance when the lithium battery packs with different specifications are connected in parallel, thereby inhibiting the output current of a single lithium battery pack from being overlarge and being more and more emphasized by people.
At present, in order to suppress the imbalance phenomenon of the lithium battery packs in parallel connection, the lithium battery packs are usually screened and tested in advance, and the same batch of battery packs produced by the same manufacturer are selected to be connected in parallel, so that the consistency of the discharge physical properties of the multiple lithium battery packs in parallel connection is ensured, and the consistency of the different lithium battery packs in the discharge process is further ensured physically. The method has large consumption of manpower and material resources, and the change of the physical characteristics of different lithium battery packs is difficult to keep consistent along with the increase of the service time of the lithium battery packs. Meanwhile, the method cannot effectively solve the problem of recycling the retired echelon lithium battery on the new energy automobile. Therefore, how to solve the parallel connection problem of the lithium battery pack more efficiently and more economically becomes more necessary.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a current control unit, a power supply device and a vehicle, so as to control the output current of a power supply module and avoid the influence of overlarge output current of the power supply module on the service life of the power supply module; in a scene that different power supply modules are connected in parallel, output currents among different power supply modules are balanced, and adverse effects on the service life and safety of a battery pack caused by overlarge output current of a single battery pack due to unbalanced output currents of different battery packs in the traditional lithium battery parallel connection use process are reduced; the reuse of the retired echelon lithium battery of the new energy automobile is facilitated, and the resource utilization rate is improved.
In order to achieve the above object, the present invention provides a current control unit, which includes a power supply module, a control module, a diode module, an output port and an input port, wherein the control module is connected to the diode module, an anode of the diode module is connected to the output port of the power supply module, a cathode of the diode module is connected to the output port, and an input end of the power supply module is connected to the input port; the output port and the input port are used for connecting a load;
the control module is used for acquiring first temperature information of the diode module and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module.
Further, the diode module comprises a plurality of sub-diode modules connected in series, each sub-diode module is conducted when not being short-circuited, and the first temperature information comprises temperature information of the sub-diode module in a conducting state; in the aspect of controlling the voltage drop of the diode module according to the first temperature information, the control module is specifically configured to: and when the temperature information of the first sub-diode module in the conducting state indicates that the temperature of the first sub-diode module is higher than a first preset temperature, controlling a second sub-diode module corresponding to the first sub-diode module to be in a non-short-circuited state.
Further, the current control unit further includes at least one switch module, the control module is connected to the control port of each switch module, the at least one switch module includes a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module; in the aspect of controlling the second sub-diode module to be in a non-short-circuited state, the control module is specifically configured to: and controlling the on-off state of the first switch module to be an off state through the control port of the first switch module.
Further, the current control unit is further configured to: and when the temperature information of the first sub-diode module represents that the temperature of the first sub-diode module is lower than a second preset temperature value, controlling the second sub-diode module to be in a short-circuited state.
Further, the current control unit further includes at least one switch module, the control module is connected to the control port of each switch module, the at least one switch module includes a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module; in the aspect of controlling the second sub-diode module to be in a short-circuited state, the control module is specifically configured to: and controlling the on-off state of the first switch module corresponding to the second sub-diode module to be a conducting state.
Furthermore, the diode module further comprises at least one temperature acquisition submodule, the control module is respectively connected with the at least one temperature acquisition submodule, each temperature acquisition submodule is arranged on one sub-diode module, a first temperature acquisition submodule in the at least one temperature acquisition submodule is arranged on the first sub-diode module, and the first temperature acquisition submodule is used for acquiring temperature information of the first sub-diode module; in the aspect of obtaining the first temperature information of the diode module, the control module is specifically configured to: and acquiring the temperature information of the sub-diode module in the conducting state through a temperature acquisition sub-module arranged on the sub-diode module in the conducting state.
Further, the sub-diode module includes a diode.
Further, the switch module includes a relay.
The invention also provides a power supply device, which comprises M current control units, wherein the output port of each current control unit is used for connecting the first end of a load after being combined, the input port of each current control unit is used for connecting the second end of the load after being combined, and M is a positive integer.
The invention also provides a vehicle, which comprises a load and the power supply device, wherein the power supply device is connected with the load.
The invention has the beneficial effects that:
1. the invention provides a current control unit, which comprises a power supply module, a control module, a diode module, an output port and an input port, wherein the control module is connected with the diode module; the output port and the input port are used for connecting a load; the control module is used for obtaining first temperature information of the diode module and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module. The control method is beneficial to controlling the output current of the internal power supply module when the power is supplied to the load, so that the damage of the power supply module caused by overlarge output current is avoided, and the service life and the safety of the power supply module are improved.
2. The invention provides a power supply device, which comprises M current control units, wherein the M current control units are connected in parallel and charge a load, the power supply device is simple in structure, different types and different physical characteristics of power supply modules can be used for a single device, the output current balance of an internal power supply module can be realized by the device at low cost, and the service life, the safety and the reliability of the power supply device are favorably improved. When the lithium battery recycling method is applied to the field of recycling of the lithium batteries of the new energy vehicles, the new energy vehicles can be reused by the aid of the retired echelon lithium batteries, and resource utilization rate is improved.
3. The invention provides a vehicle, which comprises the power supply device and a load, wherein the charging device is connected with the load. When the power supply device in the vehicle supplies power to the load, the output currents of different power supply modules in the vehicle are kept relatively balanced, and the service life, the safety and the reliability of the power supply device of the vehicle parallel power supply module are favorably improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic circuit diagram of a current control unit according to the present invention;
FIG. 2 is a graph illustrating temperature versus current for a diode;
FIG. 3 is a schematic circuit diagram of a diode module according to the present invention;
FIG. 4 is a schematic circuit diagram of another diode module provided by the present invention;
FIG. 5 is a schematic circuit diagram of a switch module according to the present invention;
FIG. 6 is a schematic circuit diagram of another switch module provided by the present invention;
FIG. 7 is a schematic circuit diagram of another switch module provided by the present invention;
FIG. 8 is a schematic circuit diagram of another switch module provided by the present invention;
FIG. 9 is a schematic circuit diagram of another diode module provided by the present invention;
FIG. 10 is a schematic circuit diagram of another diode module provided by the present invention;
FIG. 11 is a schematic circuit diagram of another current control unit provided by the present invention;
FIG. 12 is a schematic circuit diagram of a power supply apparatus provided in the present invention;
fig. 13 is a schematic circuit diagram of another power supply device provided by the 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 the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. 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 also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Example 1:
referring to fig. 1, fig. 1 is a schematic circuit diagram of a current control unit according to the present invention. The present embodiment provides a current control unit including: the LED driving circuit comprises a power supply module, a control module, a diode module, an output port and an input port, wherein the control module is connected with the diode module, the anode of the diode module is connected with the output end of the power supply module, the cathode of the diode module is connected with the output port, and the input end of the power supply module is connected with the input port; the output port and the input port are used for connecting a load;
the control module is used for acquiring first temperature information of the diode module and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module.
The single power supply module may be a battery or a battery pack composed of a plurality of batteries, such as a lithium battery and a lithium battery pack.
In practical application, when the power supply module needs to provide the output voltage of the preset value for the load, the output currents of the power supply module are different according to different actual output requirements, and the output currents of the power supply module are large and can bring a lot of adverse effects, so that when the power supply module outputs the voltage according to the load requirement, the output currents of the power supply module need to be controlled to avoid the power supply module from being in an overlarge output current state for a long time.
Specifically, referring to fig. 2, fig. 2 is a graph illustrating the relationship between the temperature and the current of the diode. Because the temperature of the diode module and the current flowing through the diode module are in a direct proportion relation, the current in the circuit is indirectly controlled within a reasonable range by regulating and controlling the circuit when the temperature of the diode module in the circuit is within a certain reasonable range. Because the diode modules connected in series in the power supply module and the load loop can generate voltage drop in a conducting state, the output current of the power supply module can be controlled in a combining range by adjusting the voltage drop of the diode modules connected in series in the power supply module and the load loop. In summary, the diode module is arranged in the power supply loop of the power supply module and the load, and the voltage drop of the diode module is adjusted according to the temperature information of the diode module, so that the control of the output current of the power supply module can be realized.
In this embodiment, the diode module includes a plurality of sub-diode modules connected in series, each sub-diode module is turned on when not being short-circuited, and the first temperature information includes temperature information of the sub-diode module in the on state; in the aspect of controlling the voltage drop of the diode module according to the first temperature information, the control module is specifically configured to:
and when the temperature information of the first sub-diode module in the conducting state indicates that the temperature of the first sub-diode module is higher than a first preset temperature, controlling a second sub-diode module corresponding to the first sub-diode module to be in a non-short-circuited state.
The first sub-diode module may be any one of a plurality of sub-diode modules, and the second sub-diode module is one of the plurality of sub-diode modules different from the first sub-diode module or a plurality of adjacent sub-diode modules. That is, whether one or more sub-diode modules are in an un-short-circuited state is controlled according to the temperature of one sub-diode module in the plurality of sub-diode modules.
In a specific implementation, referring to fig. 3, fig. 3 is a schematic circuit diagram of a diode module according to the present invention. The sub-diode modules may be diodes, and one diode module may include a plurality of sub-diode modules (only 3 sub-diode modules are exemplarily shown in fig. 3, since the first sub-diode module and the second sub-diode module may be selected from the plurality of sub-diode modules at will, which is not specifically shown in fig. 3, and in addition, the number of sub-diodes may be greater or smaller in practical application, which is not specifically limited herein).
The power supply module comprises a plurality of sub-diode modules, wherein each sub-diode module is conducted when the sub-diode module is not in a short circuit state, namely, in the plurality of sub-diode modules which are connected in series, except for the sub-diode modules at two ends, the anode of each sub-diode module is connected with the cathode of one sub-diode module which is adjacent to the sub-diode module, the cathode of each sub-diode module is connected with the anode of the other sub-diode module which is adjacent to the sub-diode module, the anode of one terminal sub-diode module in the sub-diode modules which are connected in series can be used as the anode of the whole diode module and is connected with the output end of the power supply module, and the cathode of the other terminal sub-diode module is used.
In specific implementation, whether another sub-diode module is short-circuited can be controlled through temperature information of one sub-diode module in the plurality of sub-diode modules connected in series. For example, referring to fig. 4, fig. 4 is a schematic circuit diagram of another diode module provided by the present invention, taking a sub-diode module as an example of a diode, and fig. 4 only schematically illustrates D1, D2 and DN in the plurality of sub-diode modules. For example, the temperature information of the sub-diode module D2 may be controlled according to the temperature information of the sub-diode module D1, and the temperature information of the sub-diode module DN may be controlled according to the temperature information of the sub-diode module D2, and so on, and the conduction state of one sub-diode in the series-connected sub-diode modules is affected by the temperature information of a certain sub-diode module, and the temperature information of the sub-diode module may also be used to control the conduction states of other sub-diode modules.
In practical application, the temperature information of one diode module may be used to control whether one sub-diode module is in a short-circuited state, or, in a case where a current value needs to be quickly adjusted, the temperature information of one sub-diode module may be used to determine whether a plurality of sub-diode modules are in a short-circuited state at the same time, where no specific limitation is made here. In addition, one or more sub-diode modules in a conducting state all the time can be included in the plurality of sub-diode modules, so that the regulation and control of the voltage drop of the diode modules can be started according to the temperature information of the sub-diode modules, and the number of the sub-diodes in the conducting state all the time can also be set based on actual requirements, for example, the number of the sub-diodes can be set to be one.
Specifically, the temperature of the diode and the current flowing through the diode are in a direct proportional relationship, that is, the higher the temperature of the sub-diode module is, the larger the current in the circuit is, and when the temperature of the conducted sub-diode module exceeds a first preset temperature, it is indicated that the output circuit of the power supply unit in the circuit exceeds a preset current value, and at this time, the number of the sub-diode modules in a conducting state in the circuit can be increased, so that the overall voltage drop of the diode module is improved. As shown in fig. 3 and 4, the number of the turned-on sub-diode modules increases, the conduction voltage drop between the two points VN and VP increases, the increase of the conduction voltage drop decreases the potential at VP, and further decreases the output current of the power supply module, and the decrease of the output current in the loop in turn decreases the temperature of the turned-on sub-diode modules. When the temperature of the sub-diode module which is conducted last time is still too high, the next sub-diode module is correspondingly continuously controlled to be conducted, the conduction voltage drop between the VN point and the VP point is further increased, the potential at the VP point is further reduced, the output current of the power supply module is increased and reduced, and the like, so that the purpose of reducing the temperature of the sub-diode module is finally achieved, the temperature of the diode module is ensured to be within a reasonable range, and the output current of the power supply module is controlled to be within the reasonable range.
In practical application, the first preset temperature value corresponding to each sub-diode module can be set to be the same value, and the value of the first preset temperature can be specifically selected according to actual needs, so that the output current of the power supply module can be adjusted to be not more than the output current capable of working normally.
In this embodiment, the current control unit further includes at least one switch module, the control module is respectively connected to the control port of each switch module, the at least one switch module includes a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module;
in the aspect of controlling the second sub-diode module to be in a state of not being short-circuited, the control module is specifically configured to: and controlling the on-off state of the first switch module to be an off state through the control port of the first switch module.
In a specific implementation, the switch module may be a relay. Because the switch module is connected with the corresponding sub-diode module in parallel, the corresponding sub-diode module is conducted when the switch module is disconnected.
In specific implementation, referring to fig. 5, fig. 5 is a schematic circuit schematic diagram of a switch module according to the present invention, where the second sub-diode module may be a single sub-diode module, and the control module may control whether one sub-diode module is in a short-circuited state through a control port of the switch module; or as shown in fig. 6, fig. 6 is a schematic circuit diagram of another switching module provided in the present invention, and one switching module may be used to simultaneously control whether a plurality of adjacent sub-diode modules are in a short-circuited state, so as to increase the amplitude of current regulation. The number of the sub-diode modules controlled by one switch at the same time can be set according to actual needs, and is not limited specifically here.
And the control port of each switch is connected with the control module. When the control module controls the voltage drop of the diode module, the control module is indirectly connected with the diode module through the switch modules connected in parallel in the diode module, and controls the conduction state of the sub-diode modules by controlling the on-off state of the switch modules connected in parallel with each sub-diode module so as to adjust the conduction voltage drop of the diode modules.
It should be noted that fig. 5 and 6 only schematically show 1 or 2 switch modules, and the number of switch modules in practical application is determined by the number of sub-diode modules which need to be controlled individually, and may be more or less. For example, if it is necessary to respectively control whether a first sub-diode module, a second sub-diode module, and a third sub-diode module of the plurality of sub-diode modules are in a short-circuited state, 3 switch modules are required, where one switch module is used to control whether one sub-diode module is in a short-circuited state, and the sub-diode modules corresponding to different switch modules are different; if the first sub-diode module and the second sub-diode module which are adjacent to each other need to be controlled simultaneously to be in a short-circuited state or not, and the third sub-diode module needs to be controlled independently to be in a short-circuited state or not, 2 switch modules are needed, one switch module corresponds to the first sub-diode module and the second sub-diode module, and one switch module corresponds to the third sub-diode module.
For example, taking the switch module as a relay and the sub-diode module as a diode as an example, referring to fig. 7, fig. 7 is a schematic circuit diagram of another switch module provided by the present invention. When the second sub-diode module is a single sub-diode module, the control module can control whether the sub-diode module D2 is in a short-circuited state through the control port of the switch module G01, and control whether the sub-diode module DN is in a short-circuited state through the switch module G02; alternatively, as shown in fig. 8, fig. 8 is a schematic circuit diagram of another switch module provided by the present invention. When one switch is used for simultaneously controlling whether a plurality of adjacent sub-diode modules are in a short-circuited state, if the second sub-diode module comprises the sub-diode module D2 and the sub-diode module D3, two ends of the switch module G03 are respectively connected with the anode of one terminal diode module (the sub-diode module D3) and the cathode of the other terminal diode module (the sub-diode module D2), and the switch module G03 can realize that whether the sub-diode module D2 and the sub-diode module D3 are in the short-circuited state or not at the same time, so that the amplitude of current regulation is increased. The number of the sub-diode modules controlled by one switch at the same time can be set according to actual needs, and is not limited specifically here.
In specific implementation, the plurality of sub-diode modules may include a sub-diode module which is always in a conducting state, the sub-diode module is not connected with the switch module in parallel, and each switch module may be in a conducting state in an initial state of a system default.
In this embodiment, the current control unit is further configured to: and when the temperature information of the first sub-diode module represents that the temperature of the first sub-diode module is lower than a second preset temperature value, controlling the second sub-diode module to be in a short-circuited state.
In specific implementation, besides increasing the conduction voltage drop through the sub-diode module and continuously reducing the output current value, the short circuit of the conducted sub-diode module can be set again when the temperature of the conducted sub-diode module is lower than a second preset temperature value, so that the output current can be controlled to rise. Specifically, the value of the second preset temperature should be set to be less than or equal to the value of the first preset temperature. In addition, in practical application, the second preset temperature value corresponding to each sub-diode module can be set to be the same; or the second preset temperature value corresponding to each sub-diode module can be set to be reduced in sequence, so that the turned-on sub-diode modules can be short-circuited in sequence, and the output current gradually rises.
In this embodiment, the current control unit further includes at least one switch module, the control module is respectively connected to the control port of each switch module, the at least one switch module includes a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module;
in the aspect of controlling the second sub-diode module to be in a short-circuited state, the control module is specifically configured to: and controlling the on-off state of the first switch module corresponding to the second sub-diode module to be a conducting state.
In a specific implementation, when one switch module is turned on, the sub-diode module corresponding to the switch module is short-circuited.
In this embodiment, the diode module further includes at least one temperature acquisition sub-module, the control module is respectively connected to the at least one temperature acquisition sub-module, each temperature acquisition sub-module is disposed on one sub-diode module, a first temperature acquisition sub-module of the at least one temperature acquisition sub-module is disposed on the first sub-diode module, and the first temperature acquisition sub-module is configured to acquire temperature information of the first sub-diode module;
in the aspect of obtaining the first temperature information of the diode module, the control module is specifically configured to: and acquiring the temperature information of the sub-diode module in the conducting state through a temperature acquisition sub-module arranged on the sub-diode module in the conducting state.
In a specific implementation, the temperature acquisition sub-modules may be temperature sensors, fig. 9 is a schematic diagram of a circuit principle of another diode module provided by the present invention, and fig. 9 is a schematic diagram of a circuit principle of another diode module, and each temperature acquisition sub-module may be disposed on a physical entity of a corresponding sub-diode module. The control module is indirectly connected with the diode modules through the temperature acquisition sub-modules arranged on the physical entity structures of the sub-diode modules so as to acquire the temperature information of the diode modules. Fig. 9 only shows some sub-diode modules and temperature acquisition sub-modules by way of example, in practical applications, the number of the temperature acquisition sub-modules may be greater or smaller, the number of the temperature acquisition sub-modules is determined by the number of the sub-diode modules that need to acquire temperature information, in addition, each temperature acquisition sub-module is used for acquiring the temperature information of the sub-diode module in which the temperature acquisition sub-module is located, the first temperature acquisition sub-module is not particularly shown in fig. 9, and any one sub-diode module may be arranged on the first sub-diode module as the first temperature acquisition sub-module.
For example, referring to fig. 10 again, fig. 10 is a schematic circuit diagram of another diode module provided by the present invention, taking a sub-diode module in the diode module as a diode as an example, fig. 10 exemplarily shows a temperature acquisition sub-module T1 and a temperature acquisition sub-module T2, the temperature acquisition sub-module T1 and the temperature acquisition sub-module T2 are respectively disposed on the sub-diode module D1 and the sub-diode module D2, and the control module may acquire temperature information of the sub-diode module D1 through the temperature acquisition sub-module T1 and acquire temperature information of the sub-diode module D2 through the temperature acquisition sub-module T2.
In specific implementation, an analog circuit design mode may be adopted inside the control module, or a digital circuit design mode may also be adopted, and accordingly, the signal transmitted by the temperature acquisition sub-module is an analog signal or a digital signal, and the specific design mode may be selected according to needs, for example, in consideration of no need to design a complex processing algorithm, an analog circuit design may be selected, or a digital circuit design may be adopted in consideration of the requirement of interference rejection capability.
In this embodiment, the sub-diode module includes a diode.
In this embodiment, the switch module includes a relay.
The following description is made with reference to specific examples.
Referring to fig. 11, fig. 11 is a schematic circuit diagram of another current control unit according to the present invention. In specific implementation, the control module may include a plurality of mutually independent sub-control modules, each sub-control module is connected to the corresponding temperature acquisition sub-module and the control port of the switch module, and controls the on-off state of the switch module according to the temperature information acquired by the temperature acquisition sub-module.
One diode module comprises diodes (sub-diode modules) in series: d1 and D2 … … DN, except the diodes DN, each diode is respectively provided with an independent temperature acquisition submodule T1 and an independent temperature acquisition submodule T2 … … TN-1, each temperature acquisition submodule respectively corresponds to different sub control modules C1 and C2 … … CN-1, and each sub control module corresponds to different relays (switch modules) G1 and G2 … … GN-1; wherein the content of the first and second substances,
the diodes D1 and D2 … … DN are in a series structure;
the physical bodies of the diodes D1 and D2 … … DN-1 are respectively provided with a temperature acquisition submodule T1 and a temperature acquisition submodule T2 … … TN-1;
the diodes D2 and D3 … … DN are respectively connected with the relays G1 and G2 … … GN-1 in parallel;
the sub-control modules C1 and C2 … … CN-1 comprise two parts of temperature information acquisition and relay control, and are respectively used for acquiring temperature information through temperature acquisition sub-modules T1 and T2 … … TN-1 and controlling the on and off of relays G1 and G2 … … GN-1;
the normal state of the relays G1 and G2 … … GN-1 is a conducting state, namely a closed state;
the control logic of each sub-control module in the sub-control modules C1 and C2 … … CN-1 is as follows: when the monitoring temperature is higher than a first preset temperature, controlling the corresponding relay to be switched off; such as: when the sub-control module C1 monitors that the temperature information acquired by the temperature acquisition sub-module T1 is higher than a first preset temperature, the corresponding relay G1 is controlled to be disconnected, when the sub-control module C2 monitors that the temperature information acquired by the temperature acquisition sub-module T2 is too high, the corresponding relay G2 is controlled to be disconnected, and the like.
Example 2:
referring to fig. 12, fig. 12 is a schematic circuit diagram of a power supply device according to the present invention. The present embodiment provides a power supply device, including M current control units according to embodiment 1, where an output port of each current control unit is combined and then used to connect to a first end of a load, an input port of each current control unit is combined and then used to connect to a second end of the load, and M is a positive integer.
In a specific implementation, the first end of the load may be an input end of the load, and the second end of the load may be an output end of the load.
In practical application, the physical characteristics of the power supply modules in different current control units of the same power supply device can be different, the power supply device can balance the output currents of different power supply modules connected in parallel by dynamically adjusting the number of sub-diode modules which are connected in series and conducted in the diode modules by utilizing the physical characteristics of the temperature and the current of the diodes, and the overlarge output current of individual power supply modules in the power supply modules connected in parallel is avoided; if the load demand current is not large, and the power supply device only comprises one current control unit, the output current of the power supply module in the power supply device is controlled within a relatively stable and safe range.
The following description is made with reference to specific examples.
Referring to fig. 13, fig. 13 is a schematic circuit diagram of another power supply device provided by the present invention. Wherein, M battery packs (power supply modules) in the power supply device are connected in parallel, including the battery pack 1 and the battery pack 2.. the battery pack M is connected to the parallel bus VPP by a diode cluster (i.e. a diode module including a plurality of sub-diode modules, the internal structure of the current control unit is simplified in fig. 13, and only the diode module and the switch module which are connected in series with the power supply module in the current control unit are exemplarily shown, and the internal structure of the current control unit in practical application can be referred to the description of the foregoing embodiment 1), for example, the internal diodes of the diode cluster corresponding to the battery pack 1 include D11 and D12 … … D1N; the internal diodes of the corresponding diode cluster of the battery pack 2 include D21, D22 … … D2N, and so on. The output terminal of the battery pack 1 is VN1, and the output terminal of the battery pack 2 is VN2 … … and the output terminal of the battery pack M is VNM. The voltage drop of the corresponding diode cluster of the battery pack 1 is VDD 1; the voltage drop of the diode cluster corresponding to the battery pack 2 is VDD2 … … and the voltage drop of the diode cluster corresponding to the battery pack M is VDDM. The output current of the battery pack 1 is IB1, the output current of the battery pack 2 is IB2 … …, and the output current of the battery pack M is IBM. The potentials VN1 and VN2 … … VNM of the battery output end and the parallel bus potential VPP satisfy the following relational expression:
VN1=VPP+VDD1 (1)
VN2=VPP+VDD2 (2)
VNM=VPP+VDDM (3)
assuming that all relays inside the diode clusters corresponding to each group of batteries are in an initial conduction state, i.e., a closed state, and the output current of the battery pack is in an unbalanced state, taking the battery pack 1 and the battery pack 2 as an example, the process of balancing the output currents of different battery packs is as follows:
IB1>IB2 (4)
since IB1> IB2, it can be known from the temperature-current relationship curve of the diodes in fig. 2 that the temperature of the diode cluster corresponding to the battery pack 1 is higher than the temperature of the diode cluster corresponding to the battery pack 2, and it is assumed that the temperature of the diode in the diode cluster corresponding to the battery pack 2 in the on state is not higher than the first preset temperature, and the temperature of the diode in the diode cluster corresponding to the battery pack 1 in the on state is higher than the first preset temperature, the current control unit where the battery pack 1 is located will control the corresponding relay to be turned off, increase the number of the diodes in the diode cluster in the on state, and increase the voltage drop across the diode cluster, that is, VDD1 will increase:
VDD1>VDD2 (5)
the following equations (1), (2) and (5) can be taken together:
VN1>VN2 (6)
the increase of the output potential VN1 of the battery pack 1 will result in the decrease of the output current of the battery pack 1, that is, IB1 is decreased, so that the sizes of IB1 and IB2 tend to be consistent, and so on, under the dynamic adjustment of the diode clusters, the output currents IB1 and IB2 … … IBM of the battery packs tend to be consistent, that is, the balancing effect of the output currents between the battery packs is achieved.
Example 3:
the present embodiment provides a vehicle including the power supply device and the load in embodiment 2 described above, the power supply device being connected to the load. Specifically, an output port of the power supply device is connected with an input end of a load, an input port of the power supply device is connected with an output end of the load, output ports of M current control units in the power supply device are combined to serve as output ports of the power supply device, and input ports of the M current control units are combined to serve as input ports of the power supply device.
Compared with the prior art, the invention provides a current control unit which comprises a power supply module, a control module, a diode module, an output port and an input port, wherein the control module is connected with the diode module, the anode of the diode module is connected with the output end of the power supply module, the cathode of the diode module is connected with the output port, and the input end of the power supply module is connected with the input port; the output port and the input port are used for connecting a load; the control module is used for obtaining first temperature information of the diode module and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module. The control method is beneficial to controlling the output current of the internal power supply module when the power is supplied to the load, so that the damage of the power supply module caused by overlarge output current is avoided, and the service life and the safety of the power supply module are improved.
The invention provides a power supply device, which comprises M current control units, wherein the M current control units are connected in parallel and then charge a load, the power supply device is simple in structure, can be matched with power supply modules with different types and different physical characteristics, is low in cost, is favorable for realizing the balance of output currents of the parallel power supply units, avoids overlarge output current of a single power supply module, and improves the service life, safety and reliability of the power supply device of the parallel power supply modules. When the lithium battery recycling method is applied to the field of recycling of the lithium batteries of the new energy vehicles, the new energy vehicles can be reused by the aid of the retired echelon lithium batteries, and resource utilization rate is improved.
The invention provides a vehicle, which comprises the power supply device and a load, wherein the charging device is connected with the load. When the power supply device in the vehicle supplies power to the load, the output currents of different power supply modules in the vehicle are kept relatively balanced, and the service life, the safety and the reliability of the power supply device of the vehicle parallel power supply module are favorably improved.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only the preferred embodiments of the invention have been described above, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A current control unit is characterized by comprising a power supply module, a control module, a diode module, an output port and an input port, wherein the control module is connected with the diode module, the anode of the diode module is connected with the output end of the power supply module, the cathode of the diode module is connected with the output port, and the input end of the power supply module is connected with the input port; the output port and the input port are used for connecting a load;
the control module is used for acquiring first temperature information of the diode module and controlling the voltage drop of the diode module according to the first temperature information so as to adjust the output current of the power supply module.
2. The current control unit according to claim 1, wherein the diode module includes a plurality of sub-diode modules connected in series, each sub-diode module is turned on when in a state of not being short-circuited, and the first temperature information includes temperature information of the sub-diode module in a turned-on state;
in the aspect of controlling the voltage drop of the diode module according to the first temperature information, the control module is specifically configured to: and when the temperature information of the first sub-diode module in the conducting state indicates that the temperature of the first sub-diode module is higher than a first preset temperature, controlling a second sub-diode module corresponding to the first sub-diode module to be in a non-short-circuited state.
3. The current control unit according to claim 2, further comprising at least one switch module, wherein the control module is connected to the control port of each switch module, and the at least one switch module comprises a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module;
in the aspect of controlling the second sub-diode module to be in a non-short-circuited state, the control module is specifically configured to: and controlling the on-off state of the first switch module to be an off state through the control port of the first switch module.
4. The current control unit of claim 2, wherein the current control unit is further configured to: and when the temperature information of the first sub-diode module represents that the temperature of the first sub-diode module is lower than a second preset temperature value, controlling the second sub-diode module to be in a short-circuited state.
5. The current control unit according to claim 4, further comprising at least one switch module, wherein the control module is connected to the control port of each switch module, and the at least one switch module comprises a first switch module, a first end of the first switch module is connected to the anode of the second sub-diode module, and a second end of the first switch module is connected to the cathode of the second sub-diode module;
in the aspect of controlling the second sub-diode module to be in a short-circuited state, the control module is specifically configured to: and controlling the on-off state of the first switch module corresponding to the second sub-diode module to be a conducting state.
6. The current control unit according to claim 2, wherein the diode module further comprises at least one temperature acquisition submodule, the control module is respectively connected to the at least one temperature acquisition submodule, each temperature acquisition submodule is arranged on one sub-diode module, a first temperature acquisition submodule of the at least one temperature acquisition submodule is arranged on the first sub-diode module, and the first temperature acquisition submodule is used for acquiring temperature information of the first sub-diode module;
in the aspect of obtaining the first temperature information of the diode module, the control module is specifically configured to: and acquiring the temperature information of the sub-diode module in the conducting state through a temperature acquisition sub-module arranged on the sub-diode module in the conducting state.
7. The current control unit of any of claims 2-6, wherein the sub-diode module comprises a diode.
8. Current control unit according to claim 3 or 5, characterized in that the switch module comprises a relay.
9. A power supply device, comprising M current control units according to any one of claims 1-8, wherein the output port of each current control unit is combined for connecting to a first terminal of a load, the input port of each current control unit is combined for connecting to a second terminal of the load, and M is a positive integer.
10. A vehicle characterized by comprising a load and the power supply device according to claim 9, the power supply device being connected to the load.
CN202110478122.1A 2021-04-30 2021-04-30 Current control unit, power supply unit and vehicle Active CN112994191B (en)

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CN211908409U (en) * 2020-03-27 2020-11-10 深圳市瑞能实业股份有限公司 Battery system charge-discharge switch circuit and power supply system
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Publication number Priority date Publication date Assignee Title
US20050231169A1 (en) * 2004-03-30 2005-10-20 Kazuhiro Seo Power supply apparatus
CN103318045A (en) * 2012-03-23 2013-09-25 三星Sdi株式会社 Vehicle and method of controlling the same
CN103427446A (en) * 2012-05-15 2013-12-04 成都信息工程学院 Parallel storage battery pack voltage difference control technology
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