CN115284878A - Vehicle power distribution assembly circuit, control method and operation vehicle - Google Patents
Vehicle power distribution assembly circuit, control method and operation vehicle Download PDFInfo
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- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
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- 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
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- 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
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a vehicle power distribution assembly circuit, a control method and an operation vehicle, belonging to the technical field of circuits and comprising the following steps: the detection and acquisition unit comprises a node arranged from the high-voltage battery to the bus bar, a node with a positive electrode interface and a negative electrode interface connected to the bus bar, and a temperature sensor at the node with the negative electrode interface and the positive electrode interface, wherein the temperature sensor uploads temperature data of the node to the BMS, and the BMS controls the on-off of each relay according to the temperature data. The vehicle power distribution assembly circuit, the control method and the working vehicle provided by the invention have the advantages that the integration level of functional modules is high, bus-bar-system convergence failure risk points are few, the full-coverage monitoring of the states of all relays is realized, the multi-temperature point distribution control is implemented by the conductive convergence main node and the high-power node, the state change inside the power distribution assembly is effectively monitored when the performance changes in the vehicle power distribution operation process, the node performance attenuation sign in the power distribution process is reported in advance, and the quality accident risk generated by the node performance attenuation sign is reduced.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a power distribution assembly circuit for a vehicle, a control method and an operation vehicle.
Background
New forms of energy commercial car, contain electric vehicle such as electronic heavily blocking, demand because of battery capacity is big, load power is high, consequently, the bicycle battery demand quantity is high, high-voltage wire harness connected node is many, it is complicated because of the circuit in the distribution box easily to appear in the high-voltage distribution process, electric node is many, node spiro union moment of torsion decay etc. is easy to take place in the use and leads to electrically conductive contact failure or the spiro union point design quantity is not enough to lead to the node current-carrying capacity under the specific operating mode not enough, thereby lead to the distribution assembly to appear the overheat phenomenon, performance decay that produces from this even, electrically conductive insulating layer is ageing, drop or even the major problem such as electrically conductive fusing.
So far, the hidden danger is not paid attention, the power distribution circuit of the electric vehicle still only adopts a current and voltage monitoring mode to calculate the power distribution power, as long as the power distribution power does not exceed the design power MAP, and the reasons that the actual power distribution power is smaller are not reported, so under a plurality of working conditions, the reasons are traced and investigated only after the vehicle maintenance or the conductive piece in the vehicle power distribution assembly is fused to cause serious consequences.
In view of this, it is urgently needed to improve the existing power distribution assembly circuit to enrich the diversity of monitoring modes and timely discover the occurrence of unexpected faults such as performance attenuation, aging and falling of the conductive insulating layer, even fusing of the conductive member, and the like in the power distribution assembly circuit.
Disclosure of Invention
The invention provides a power distribution assembly circuit for a vehicle, a control method and an operating vehicle, which are used for solving the problem that in the prior art, only power distribution power is monitored, and some defects in the power distribution assembly circuit cannot be found, and realizing comprehensive and diversified monitoring of the power distribution assembly circuit.
In a first aspect, the present invention provides a power distribution assembly circuit for a vehicle, comprising:
the system comprises a high-voltage battery, a battery management system main control module BMS, an external high-voltage interface unit, a power distribution unit and a detection acquisition unit which are integrated in the same space;
the external high-voltage interface unit comprises a plurality of groups of high-voltage input and output interfaces, each group of high-voltage input and output interfaces comprises a negative electrode interface and a positive electrode interface, all the positive electrode interfaces are connected to a first bus bar, all the negative electrode interfaces are connected to a second bus bar, the first bus bar is connected to a high-voltage positive electrode interface of the high-voltage battery, and the second bus bar is connected to a high-voltage negative electrode interface of the high-voltage battery;
the power distribution unit at least comprises a relay configured on a branch where each group of high-voltage input/output interfaces is located;
the detection acquisition unit at least comprises a node arranged from the high-voltage battery to the first bus bar, a node arranged from the high-voltage battery to the second bus bar, a node with each positive electrode interface connected to the first bus bar, a node with each negative electrode interface connected to the second bus bar, and a temperature sensor at least at one node in the nodes of each negative electrode interface and each positive electrode interface, wherein each temperature sensor uploads the temperature data of the node to the BMS;
and the BMS controls the on-off of each relay according to the temperature data.
According to the power distribution assembly circuit for the vehicle, provided by the invention, the detection acquisition unit further comprises a primary circuit signal acquisition module;
the first-stage circuit signal acquisition module comprises: the relay adhesion collection end points are arranged on the branch where each group of high-voltage input and output interfaces are located, each relay adhesion collection end point is connected to a relay adhesion collection port on the BMS and used for collecting the on-off state of the relay on the branch where each group of high-voltage input and output interfaces are located and uploading the collected on-off state to the BMS.
According to the vehicle power distribution assembly circuit provided by the invention, the high-voltage positive electrode interface of the high-voltage battery and the high-voltage negative electrode interface of the high-voltage battery are in a redundant design;
a positive manual maintenance switch MSD is connected in series between the first bus bar and each high-voltage positive interface of the high-voltage battery; the two adjacent MSDs are arranged in an interlocking mode, and a high-voltage interlocking acquisition end point is arranged on a wiring terminal of each MSD;
each high-voltage interlocking collection endpoint is respectively connected to a high-voltage interlocking collection port on the BMS, so that the BMS can determine whether the MSD acts correctly or not, and the first bus bar is communicated with at most one high-voltage positive electrode interface of the high-voltage battery.
According to the power distribution assembly circuit for the vehicle provided by the invention, the multiple groups of high-voltage input and output interfaces comprise: at least one set of charging input interface, at least one set of auxiliary interface and at least one set of output interface.
According to the power distribution assembly circuit for the vehicle, provided by the invention, a negative electrode interface and a positive electrode interface of each group of output interfaces are respectively provided with a high-voltage interlocking acquisition endpoint;
each high-voltage interlocking acquisition terminal is respectively connected to a high-voltage interlocking acquisition port on the BMS, so that the BMS can determine whether a high-voltage loop is constructed between the negative electrode interface and the positive electrode interface.
According to the invention, the power distribution assembly circuit for the vehicle further comprises: an external low pressure port unit and an internal low pressure port;
the external low-pressure port unit comprises a whole vehicle low-pressure port and an auxiliary low-pressure port;
the high voltage battery interacts with the BMS through the internal low voltage port.
According to the power distribution assembly circuit for the vehicle, provided by the invention, the high-voltage battery further comprises a heating auxiliary circuit anode interface adopting a redundancy design;
the branch where the positive electrode interface of each heating auxiliary circuit is located is connected to a first bus bar in a parallel mode through a heating auxiliary circuit relay;
a fuse and a heating auxiliary circuit relay adhesion acquisition endpoint are arranged between the heating auxiliary circuit positive electrode interface and the first bus bar;
each heating auxiliary road relay is connected to a relay control interface on the BMS, and each heating auxiliary road relay adhesion acquisition end point is connected to a relay adhesion acquisition port on the BMS.
According to the power distribution assembly circuit for the vehicle, the shunt module is connected between the high-voltage negative electrode interface of any high-voltage battery and the second bus bar in series; the shunt module uploads the collected high-voltage battery working current to the BMS;
and a current sensor is arranged between any one of the heating auxiliary way negative electrode interfaces and the second bus bar, and the current sensor uploads the collected heating auxiliary way current to the BMS.
In a second aspect, the present invention further provides a control method for a BMS in the vehicle power distribution assembly circuit according to any one of the above first aspects, comprising:
acquiring the on-off state of a relay on a branch where each group of high-voltage input/output interfaces are located and the temperature data of a node where each temperature sensor is located;
and executing a temperature grading control strategy according to the on-off state, the temperature data and the operation mode of the vehicle power distribution system so as to adjust the state of each relay.
According to the control method provided by the invention, the step of executing a temperature grading control strategy according to the on-off state, the temperature data and the operation mode of the vehicle power distribution system so as to adjust the state of each relay comprises the following steps:
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the running mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, relays of branches where all output interfaces are located are closed according to running electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting a three-level fault and adjusting the on-off of each relay so as to realize the low voltage of the battery;
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the charging mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, the relays of all branches where the output interfaces are located and the relays of the charging input interfaces are closed according to charging electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; and if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting a three-level fault and adjusting the on-off of each relay so as to realize the low voltage of the battery.
In a third aspect, the present invention provides a work vehicle comprising a vehicular power distribution assembly circuit as defined in any one of the first aspects above.
The vehicle power distribution assembly circuit, the control method and the working vehicle provided by the invention have the advantages that the integration level of functional modules is high, bus-bar-system convergence failure risk points are few, the full-coverage monitoring of the states of all relays is realized, the multi-temperature point distribution control is implemented by the conductive convergence main node and the high-power node, the state change inside the power distribution assembly is effectively monitored when the performance changes in the vehicle power distribution operation process, the node performance attenuation sign in the power distribution process is reported in advance, and the quality accident risk generated by the node performance attenuation sign is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a high-voltage distribution system of an electric vehicle in the prior art;
FIG. 2 is a schematic circuit diagram of a vehicle power distribution assembly circuit provided by the present invention;
FIG. 3 is a schematic flow chart of a control method provided by the present invention;
wherein the reference numerals are:
1: a high voltage battery; 2: a BMS;301: outputting a first positive electrode; 302: outputting a second positive electrode; 303: charging input first positive electrode; 304: charging and inputting a second positive electrode; 305: an auxiliary anode interface; 311: outputting a first cathode; 312: outputting a second cathode; 313: a charging input first negative electrode; 314: a charging input second cathode; 315: an accessory negative electrode interface; 401: a main negative relay; 402: a charging negative relay; 403: charging a first positive relay; 404: charging a second positive relay; 405: an accessory negative relay; 406: a heating master negative relay; 407: heating a main positive relay; 4011 to 4071: a relay control interface; 411: inputting a first positive MSD;412: inputting a second positive electrode MSD;421: an external accessory fuse; 422: a heating branch circuit first fuse; 423: a heating branch circuit second fuse; 501: a total negative shunt module; 5011: a total negative shunt module collects end points; 511: inputting a first negative current sensor module; 5111: inputting a first negative current sensor acquisition endpoint; 512: an internal accessory total negative current sensor module; 5121: an internal accessory total negative current sensor acquires an endpoint; 521-522: MSD high-voltage interlocking acquisition endpoints; 523 to 524: high-voltage interlocking acquisition endpoints of the high-voltage connector interface; 531: inputting a total negative node temperature acquisition endpoint; 532: inputting a total positive node temperature acquisition endpoint; 533: outputting a total negative node temperature acquisition endpoint; 534: outputting a total positive node temperature acquisition endpoint; 541 to 547: the relay is adhered to a high-voltage acquisition endpoint; 551: insulating a high voltage positive acquisition endpoint; 552: insulating a high-voltage negative acquisition endpoint; 553: collecting end points in an insulated manner; 601: a low-voltage port of the whole vehicle; 602: an accessory low pressure port; 603: an internal low pressure port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that, in the description of the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. Further, "and/or" indicates at least one of the connected objects, the character "/", generally indicating that the former and latter related objects are in an "or" relationship.
Fig. 1 is a schematic structural diagram of a high-voltage power distribution system of an electric vehicle in the prior art, and as shown in fig. 1, the high-voltage power distribution system of the electric vehicle currently used generally includes a power distribution module 100, a high-voltage detection module 200, a power distribution control module 300, and a high-voltage battery 400; the power distribution module 100 is respectively connected with the high-voltage detection module 200, the power distribution control module 300 and the high-voltage battery 400, and the power distribution control module 300 is connected with the high-voltage detection module 200; the power distribution control module 100 is configured to receive a control signal sent by the high voltage detection module 200, and control the power distribution module 100 to gate different connection loops according to the control signal; the high voltage detection module 200 is used for detecting the voltage of the high voltage distribution module 200 connection loop and confirming the fault state of the distribution module 100 according to the voltage of the distribution module 100 connection loop.
The high voltage detection module 200 in the existing high voltage distribution system only adopts a voltage monitoring mode, confirms the fault state of the distribution module 100 by calculating the distribution power, and does not pay attention to the reason causing the reduction of the distribution power, so under a plurality of working conditions, the investigation of the reason is not traced after the serious consequences are caused by the maintenance inspection of vehicles or the fusing of conductive pieces in a vehicle distribution assembly.
The reason for reducing the distribution power is generally that the high-voltage distribution system integrated in the distribution box has complex circuits and many electrical nodes, and in the using process, the bolt connection torque attenuation of each node easily occurs to cause poor contact of the conductive piece, or the design quantity of the bolt connection points is not enough to cause insufficient current carrying capacity of the nodes under specific working conditions, so that the power distribution assembly is over-heated and overheated, and even the performance attenuation, the aging of the conductive piece insulating layer, the falling and even the major faults of the conductive piece fusing and the like caused by the phenomenon can occur.
In order to overcome the defects of a circuit of a high-voltage power distribution System provided in the prior art, the invention provides a power distribution assembly circuit for a vehicle, which monitors the states of a Battery, charging and load in the power distribution process by using a Battery Management System (BMS) which integrates detection and power distribution control into a whole in a power Battery System for the vehicle, and controls the on-off of a high-voltage input/output interface in a power distribution module according to the change of each state in the power distribution process, especially the temperature change of some key transition nodes (such as a main loop screw joint or an electrical structure risk screw joint) so as to meet the requirement of directional power distribution.
In addition, on the basis of the vehicle power distribution assembly circuit, the invention sets a temperature control strategy according to the temperature state of the transition node so as to provide a control method for the vehicle power distribution assembly circuit.
Fig. 2 is a schematic circuit diagram of the power distribution assembly circuit for a vehicle provided by the present invention, and as shown in fig. 2, the power distribution assembly circuit for a vehicle provided by the present invention mainly includes: the high-voltage battery management system comprises a high-voltage battery 1, a battery management system main control module BMS2, an external high-voltage interface unit, a power distribution unit and a detection acquisition unit which are integrated in the same space.
The external high-voltage interface unit comprises a plurality of groups of high-voltage input and output interfaces, each group of high-voltage input and output interfaces comprises a negative electrode interface and a positive electrode interface, all the positive electrode interfaces are connected to a first bus bar, all the negative electrode interfaces are connected to a second bus bar, the first bus bar is connected to the high-voltage positive electrode interface of the high-voltage battery 1, and the second bus bar is connected to the high-voltage negative electrode interface of the high-voltage battery 2; the power distribution unit at least comprises a relay configured on a branch where each group of high-voltage input/output interfaces is located; the detection acquisition unit at least comprises a node arranged from the high-voltage battery to the first bus bar, a node arranged from the high-voltage battery to the second bus bar, a node with each positive electrode interface connected to the first bus bar, a node with each negative electrode interface connected to the second bus bar, and a temperature sensor at least at one node in the nodes of each negative electrode interface and each positive electrode interface, wherein each temperature sensor uploads the temperature data of the node to the BMS 2; and the BMS2 controls the on-off of each relay according to the temperature data.
In the power distribution assembly circuit for the vehicle, the high-voltage battery provides power for the M parallel branches (M is larger than or equal to 2), and the BMS2 integrates communication interaction, power distribution control and high-low voltage acquisition and processing functions.
The external high-voltage interface unit mainly comprises a plurality of groups of high-voltage input and output interfaces for load connection, wherein each group of high-voltage input and output interfaces respectively comprises a negative electrode interface and a positive electrode interface. As shown in fig. 2, the plurality of groups of high voltage input/output interfaces may include: an output first positive electrode 301, an output second positive electrode 302, a charge input first positive electrode 303, a charge input second positive electrode 304, an accessory positive electrode interface 305, an output first negative electrode 311, an output second negative electrode 312, a charge input first negative electrode 313, a charge input second negative electrode 314, and an accessory negative electrode interface 315.
The output first positive electrode 301 and the output first negative electrode 311 form a group of high-voltage output interfaces, the output second positive electrode 302 and the output second negative electrode 312 form another group of high-voltage output interfaces, and the two groups of high-voltage output interfaces are used for connecting a high-voltage load. The charging input first positive electrode 303 and the charging input first negative electrode 313 form a group of high voltage input interfaces, the charging input second positive electrode 304 and the charging input second negative electrode 314 form another group of high voltage input interfaces, and the two groups of high voltage input interfaces are used for being connected with a charging pile to charge a high voltage battery. The accessory positive interface 305 and the accessory negative interface 315 form a set of accessory output interfaces for connecting accessory loads.
The high-voltage battery is provided with a plurality of interfaces, and the high-voltage battery at least comprises a plurality of high-voltage positive electrode interfaces, a plurality of high-voltage negative electrode interfaces, a plurality of heating auxiliary circuit positive electrode interfaces and a plurality of heating auxiliary circuit negative electrode interfaces. As shown in fig. 2, the number of the high-voltage positive electrode interface, the high-voltage negative electrode interface, the heating auxiliary circuit positive electrode interface, and the heating auxiliary circuit negative electrode interface is two.
The positive electrode interfaces of all the input/output interfaces, such as the first positive electrode 301, the output second positive electrode 302, the charge input first positive electrode 303, the charge input second positive electrode 304, the accessory positive electrode interface 305, etc., are connected to a first bus bar, and the first bus bar is connected to at least one high-voltage positive electrode interface of the high-voltage battery 1 through at least one high-voltage branch line. Taking fig. 2 as an example, the first bus bar is connected in parallel to two high-voltage positive electrode interfaces of the high-voltage battery 1 through two high-voltage branch lines.
Likewise, all negative interfaces of the input/output interfaces, such as the output first negative 311, the output second negative 312, the charge input first negative 313, the charge input second negative 314, and the accessory negative interface 315, are connected to a second bus bar, and the second bus bar is also connected to at least one high-voltage negative interface of the high-voltage battery 1 through at least one high-voltage branch line. Taking fig. 2 as an example, the second bus bar is connected in parallel to two high-voltage negative electrode interfaces of the high-voltage battery 1 through two high-voltage branch lines.
The vehicle power distribution assembly circuit provided by the invention adopts bus system convergence, the function integration level is high, and the failure risk is less.
Furthermore, the temperature sensors are distributed on a plurality of confluence main nodes and high-power nodes, so that the temperature data at the nodes can be collected in real time and uploaded to the BMS2.
Optionally, the bus master node and the high-power node mainly include: a node of a high voltage battery to a first bus bar, a node of the high voltage battery to a second bus bar, a node of each positive interface connected to the first bus bar, a node of each negative interface connected to the second bus bar, and a node of each negative interface and each positive interface
Furthermore, in the vehicle power distribution assembly circuit provided by the invention, relays are arranged on the branches where the negative electrode interface or the positive electrode interface of each group of high-voltage input and output interfaces is located, and the on or off of the relays is controlled by the BMS2.
Specifically, the BMS2 may implement commissioning or disabling of each set of input/output interfaces by controlling on/off of the relay on each branch in conjunction with the temperatures at the bus master node and the high-power node.
For example, if the temperature at the node between the branch where the first positive electrode 301 is output and the first bus bar is higher than the preset temperature threshold, the BMS2 may control the relay on the branch where the first positive electrode 301 is output, and may synchronously turn off the relay on the branch where the first negative electrode 311 is output, until the fault is eliminated, and then the BMS2 controls the corresponding relay to pull in.
The vehicle power distribution assembly circuit provided by the invention has the advantages that the integration level of functional modules is high, bus-bar bus failure risk points are few, the full-coverage monitoring of all relay states is realized, the multi-temperature point distribution control is implemented on the conductive bus main node and the high-power node, the state change inside the power distribution assembly is effectively monitored when the performance of a vehicle is changed in the power distribution operation process, the node performance attenuation symptom in the power distribution process is reported in advance, and the quality accident risk generated by the node performance attenuation symptom is reduced.
Based on the content of the above embodiment, as an optional embodiment, the detection and acquisition unit further includes a primary circuit signal acquisition module; the first-stage circuit signal acquisition module comprises: the relay adhesion collection end points are arranged on the branch where each group of high-voltage input and output interfaces are located, each relay adhesion collection end point is connected to a relay adhesion collection port on the BMS and used for collecting the on-off state of the relay on the branch where each group of high-voltage input and output interfaces are located and uploading the collected on-off state to the BMS.
In the power distribution assembly circuit for the vehicle provided by the invention, the power distribution module mainly comprises: the system comprises relays controlled by a BMS (battery management system) on branches where each group of high-voltage input and output interfaces are located, manual Service Drain (MSD) modules operated manually and fuses blown passively by overload.
The detection acquisition unit mainly comprises a primary circuit signal acquisition module and a secondary circuit signal acquisition module. The related components of the primary circuit signal acquisition module are generally arranged in the high-voltage line, and the secondary circuit signal acquisition module is generally arranged near the high-voltage line.
The primary circuit signal acquisition module is mainly used for acquiring high-voltage signals, and comprises relay adhesion detection, shunt signal detection, insulation detection signals and the like in a circuit.
The most important temperature sensors in the secondary circuit signal acquisition module are arranged on a node from a high-voltage battery to a bus bar, a node from the bus bar to a charge-discharge branch and an external high-voltage interface node, and are used for acquiring temperature data of each node and reporting the temperature data to the BMS2. Referring to fig. 2, in the embodiment of the present invention, four temperature acquisition endpoints are mainly provided, including: inputting a total negative node temperature collection endpoint 531; input total positive node temperature acquisition endpoint 532; the four nodes are respectively used for acquiring temperature data of a second bus bar connected to a high-voltage negative interface (namely, an input total negative node temperature acquisition endpoint 531), a charging input second positive electrode 304 (an input total positive node temperature acquisition endpoint 532), a connection point of a charging input second negative electrode 314 and an output first negative electrode (an output total negative node temperature acquisition endpoint 533), and a first positive electrode 301 connected to a first bus bar (an output total positive node temperature acquisition endpoint 534).
The operating state of the vehicle power distribution assembly circuit is monitored by the BMS2 according to the temperature data output by the four temperature acquisition end points, and if any one of the temperature data is found to be greater than the preset temperature, the relevant relay can be controlled to be disconnected.
The primary circuit signal acquisition module includes relay adhesion acquisition endpoints disposed on a branch where each group of high-voltage input/output interfaces is located, as shown in fig. 2, the primary circuit signal acquisition module mainly includes adhesion acquisition endpoints disposed at positions of relays on branches where high-voltage input/output interfaces such as a first positive electrode 301, an output second positive electrode 302, a charge input first positive electrode 303, a charge input second positive electrode 304, an accessory positive electrode interface 305, an output first negative electrode 311, an output second negative electrode 312, a charge input first negative electrode 313, a charge input second negative electrode 314, and an accessory negative electrode interface 315 are located, which are respectively represented as relay adhesion high-voltage acquisition endpoints 541-547 in fig. 2.
Above-mentioned relay adhesion high pressure is gathered the endpoint and is all connected to the port is gathered to the corresponding relay adhesion on BMS2 through high-voltage signal line, and wherein every relay adhesion high pressure is gathered the endpoint and is connected to a relay adhesion on BMS2 and gather the port, BMS2 just can real-timely acquire the state of every relay like this to there is the relay of adhesion trouble in the discovery that can be timely, in order to further promote the protection to whole automobile-used distribution assembly circuit.
Based on the content of the above embodiment, as an optional embodiment, both the high-voltage positive interface of the high-voltage battery and the high-voltage negative interface of the high-voltage battery adopt a redundant design;
a positive manual maintenance switch MSD is connected in series between the first bus bar and each high-voltage positive interface of the high-voltage battery; two adjacent MSDs are arranged in an interlocking mode, and a high-voltage interlocking acquisition end point is arranged on a wiring terminal of each MSD;
each high-voltage interlocking collection endpoint is respectively connected to a high-voltage interlocking collection port on the BMS, so that the BMS can determine whether the MSD acts correctly or not, and the first bus bar is communicated with at most one high-voltage positive electrode interface of the high-voltage battery.
It should be noted that, the high-voltage positive interfaces of the plurality of high-voltage batteries and the corresponding high-voltage negative interfaces of the high-voltage batteries are matched, a parallel connection mode can be adopted to respectively provide power for a certain part of the high-voltage input and output interfaces, and the MSD connected in series in the circuit realizes the commissioning control of the respective related high-voltage input and output interfaces.
As an optional embodiment, a redundant design may also be adopted, that is, one group of high-voltage positive electrode interfaces and the corresponding high-voltage negative electrode interfaces of the high-voltage batteries are used as the main devices, the other group of high-voltage positive electrode interfaces and the corresponding high-voltage negative electrode interfaces of the high-voltage batteries are used as the standby devices, and the main-standby switching is realized by MSD connected in series in the circuit.
Taking fig. 2 as an example, an input first positive electrode MSD411 and an input second positive electrode MSD412 are respectively connected in series to the branches where the charge input first positive electrode 303 and the charge input second positive electrode 304 are located. In the case that the branches in which the charging input first positive electrode 303 and the charging input second positive electrode 304 are located are both connected to the first bus bar, on the one hand, the connection and disconnection between the charging input first positive electrode 303 and/or the charging input second positive electrode 304 and the first bus bar can be controlled by the input first positive electrode MSD411 and the input second positive electrode MSD412.
Further, MSD may be connected in series between the second bus bar and each high-voltage negative electrode interface of the high-voltage battery, so as to adopt a redundant design for the high-voltage negative electrode interfaces of the plurality of high-voltage batteries. Furthermore, MSD can be respectively designed on the positive branch of the heating auxiliary circuit and the negative branch of the heating auxiliary circuit, so as to realize the redundancy design of the corresponding branches.
According to the vehicle power distribution assembly circuit, the redundancy design is carried out on each branch circuit output by the high-voltage battery in a redundancy design mode, when any branch circuit fails, the standby branch circuit can be switched in time, and the stability of the vehicle power distribution assembly circuit can be improved.
Based on the content of the foregoing embodiments, as an optional embodiment, the multiple sets of high voltage input/output interfaces include: at least one set of charging input interfaces, at least one set of accessory interfaces, and at least one set of output interfaces.
As shown in fig. 2, the multiple groups of high voltage input/output interfaces specifically include: an output first positive electrode 301, an output second positive electrode 302, a charge input first positive electrode 303, a charge input second positive electrode 304, an accessory positive electrode interface 305, an output first negative electrode 311, an output second negative electrode 312, a charge input first negative electrode 313, a charge input second negative electrode 314, and an accessory negative electrode interface 315.
The output first positive electrode 301 and the output first negative electrode 311 form a group of high-voltage output interfaces, the output second positive electrode 302 and the output second negative electrode 312 form another group of high-voltage output interfaces, and the two groups of high-voltage output interfaces are used for connecting a high-voltage load. The charging input first positive electrode 303 and the charging input first negative electrode 313 form a group of high voltage input interfaces, the charging input second positive electrode 304 and the charging input second negative electrode 314 form another group of high voltage input interfaces, and the two groups of high voltage input interfaces are used for being connected with a charging pile to charge a high voltage battery. The accessory positive interface 305 and the accessory negative interface 315 form a set of accessory output interfaces for connecting accessory loads.
Wherein, in order to make the break-make of every group high voltage input output interface of control that BMS2 can be accurate, all configured the relay for every group high voltage input output interface, mainly include: a main negative relay 401, a charging negative relay 402, a charging first positive relay 403, a charging second positive relay 404, an auxiliary negative relay 405, a heating total negative relay 406, and a heating total positive relay 407. The layout position of each relay and the corresponding branch circuit to be controlled can be referred to fig. 2. Each relay corresponds to one of the relay control interfaces 4011 to 4071 in the BMS2.
Based on the content of the above embodiment, as an optional embodiment, a negative interface and a positive interface of each group of output interfaces are respectively provided with a high-voltage interlocking acquisition endpoint;
each high-voltage interlocking acquisition terminal is connected to a high-voltage interlocking acquisition port on the BMS respectively, so that the BMS can determine whether a high-voltage loop is constructed between the negative electrode interface and the positive electrode interface.
High voltage interlock, also known as a hazardous voltage interlock loop, refers to the use of low voltage signals to check the electrical connection integrity of all of the branches connected to the bus bars on the electrical distribution assembly circuit for a vehicle. When the entire high voltage circuit is disconnected or the integrity is damaged, the BMS may initiate safety measures, such as alarms or disconnection of the high voltage circuit.
Taking fig. 2 as an example, in the vehicle power distribution assembly circuit provided by the present invention, high voltage connector interface high voltage interlock acquisition terminals 523 to 524 are provided, which are respectively connected to the charging input second negative electrode 314 and the output first positive electrode 301; MSD high-voltage interlocking acquisition endpoints 521-522 are respectively connected to the input first positive MSD411 and the input second positive MSD412.
Further, communication connection between the MSD high-voltage interlocking acquisition endpoints 521-522 and the high-voltage connector interface high-voltage interlocking acquisition endpoints 523-524 and the BMS2 is established, so that the BMS2 can determine whether the whole high-voltage loop is complete by acquiring voltage values at the respective high-voltage interlocking acquisition endpoints.
Based on the content of the foregoing embodiment, as an alternative embodiment, referring to fig. 2, the power distribution assembly circuit for a vehicle provided by the present invention further includes: an external low pressure port unit and an internal low pressure port 603; the outward low-pressure port unit comprises a whole vehicle low-pressure port 601 and an auxiliary low-pressure port 602; the high voltage battery interfaces with BMS2 through the internal low voltage port 603.
Further, an insulated high voltage positive collection terminal 551, an insulated high voltage negative collection terminal 552 and an insulated ground collection terminal 553 are also provided in the BMS2, wherein the insulated high voltage positive collection terminal 551. The insulated high-voltage positive collection terminal 551 is mainly used for obtaining the insulation performance of the first bus bar, the insulated high-voltage negative collection terminal 552 is mainly used for obtaining the insulation performance of the second bus bar, and the insulated ground collection terminal 553 is mainly used for obtaining the ground insulation performance of the whole vehicle power distribution assembly circuit.
Based on the content of the foregoing embodiment, as an optional embodiment, the high voltage battery further includes a heating auxiliary circuit positive electrode interface adopting a redundant design;
the branch where the positive electrode interface of each heating auxiliary circuit is located is connected to a first bus bar in a parallel mode through a heating auxiliary circuit relay;
a fuse and a heating auxiliary circuit relay adhesion acquisition endpoint are arranged between the heating auxiliary circuit positive electrode interface and the first bus bar;
each heating auxiliary road relay is connected to a relay control interface on the BMS, and each heating auxiliary road relay adhesion acquisition endpoint is connected to a relay adhesion acquisition port on the BMS.
As shown in fig. 2, a first fuse 422 of the heating branch and a second fuse 423 of the heating branch are respectively connected in series to the branches where the positive interfaces of the two heating auxiliary circuits are located, so as to ensure that the current of the loop where the heating auxiliary circuit is located is smaller than a preset current threshold.
The two parallel branches are connected in series with a heating main positive relay 407, and the BMS2 controls the on-off of the heating main positive relay 407.
It should be noted that a relay adhesion high-voltage collection endpoint 547 is also arranged at the heating main positive relay 407, and voltage information and/or current information output by the endpoint is fed back to the BMS2, so that the BMS2 can determine the actual on-off state of the heating main positive relay 407.
Based on the content of the above embodiment, as an optional embodiment, a shunt module is connected in series between the high-voltage negative electrode interface of any one of the high-voltage batteries and the second bus bar; the shunt module uploads the collected high-voltage battery working current to the BMS;
and a current sensor is arranged between any one of the heating auxiliary way negative electrode interfaces and the second bus bar, and the current sensor uploads the collected heating auxiliary way current to the BMS.
Taking fig. 2 as an example, after two heating auxiliary negative electrode interfaces designed on the high voltage battery 1 are connected in parallel on a branch where the two heating auxiliary negative electrode interfaces are located, an internal auxiliary total negative current sensor module 512 is arranged in the circuit, so as to feed back the collected current of the loop where the heating auxiliary is located to the BMS2 in real time.
Further, a total heating negative relay 406 and a corresponding relay adhesion high-voltage acquisition end point 546 are arranged on the branch where the negative electrode interface of the whole heating auxiliary road is located, and the functions are not described in detail.
As an optional embodiment, a corresponding port may be further added to the BMS2 to collect the current of the branch where each group of the high voltage input/output interface is located, for example, a collection terminal 5111 of the first negative current sensor is provided to collect the current value of the branch where the first negative electrode 313 is located; setting an internal accessory total negative current sensor acquisition endpoint 5121 to obtain a current value in a loop between the accessory positive interface 305 and the accessory negative interface 315; the current values of the high-voltage battery and the branch where the second bus bar is located are obtained in real time when the total negative shunt module collection end point 5011 is set.
It should be noted that, according to the actual monitoring requirement, the current sensors may be additionally arranged in other loops in the entire vehicle power distribution assembly circuit, and the collected current information of the loops where the current sensors are located is uploaded to the BMS2, so that the BMS2 can make a control decision.
Furthermore, a fuse can be arranged between the positive electrode interface of each group of high-voltage input and output interfaces and the first bus bar, so that when the voltage in a loop where any one positive electrode interface and the first bus bar are located exceeds a preset current threshold, the loop where any one positive electrode interface and the first bus bar are located is automatically disconnected. For example, by adding the external accessory fuse 421, it is ensured that the branch current at which each high voltage input/output interface is located is smaller than the preset temperature threshold.
Based on the content of the foregoing embodiment, as an optional embodiment, a shunt module is connected in series between the high-voltage negative electrode interface of any one of the high-voltage batteries and the second bus bar; the current divider module uploads the collected high-voltage battery working current to the BMS; and a current sensor is arranged between any one heating auxiliary circuit cathode interface and the second bus bar, and the current sensor uploads the collected heating auxiliary circuit current to the BMS.
As an optional embodiment, a corresponding port may be further added to the BMS2 to collect the current of the branch where each group of the high voltage input/output interface is located, for example, a collection terminal 5111 of the first negative current sensor is provided to collect the current value of the branch where the first negative electrode 313 is located; an internal auxiliary total negative current sensor acquisition endpoint 5121 is set to obtain the current value in the loop between the auxiliary positive interface 305 and the auxiliary negative interface 315; the current values of the high-voltage battery and the branch where the second bus bar is located are obtained in real time when the total negative shunt module collection end point 5011 is set.
It should be noted that, according to the actual monitoring requirement, the current sensors may be additionally arranged in other loops in the entire vehicle power distribution assembly circuit, and the collected current information of the loops where the current sensors are located is uploaded to the BMS2, so that the BMS2 can make a control decision.
High-voltage signal not only relay adhesion detects, shunt signal detection, insulating detection signal etc. in addition, low-voltage signal is also not only temperature signal, current sensor signal, high-pressure interlocking signal etc..
Fig. 3 is a control method applied to the power distribution assembly circuit for a vehicle according to any of the above embodiments, and an implementation body of the control method is a BMS. In the actual operation process, the BMS mainly performs, but is not limited to, the following:
acquiring the on-off state of a relay on a branch where each group of high-voltage input/output interfaces are located and the temperature data of a node where each temperature sensor is located;
and executing a temperature grading control strategy according to the on-off state, the temperature data and the operation mode of the vehicle power distribution system so as to adjust the state of each relay.
In the vehicle power distribution assembly circuit provided by the invention, the BMS2 is mainly connected with the detection and acquisition module through the low-voltage signal line and the high-voltage signal line to acquire the working state in the power distribution process; the low-voltage control line is connected with the power distribution module to perform power distribution control; and the low-voltage power supply line and the low-voltage signal line are connected with the high-voltage battery, the charging hardware and the load hardware for communication interaction. Wherein, high, low pressure circuit mainly contains: the low-voltage signal line, the high-voltage signal line, the low-voltage control line, the low-voltage power supply line, the high-voltage branch line, the high-voltage busbar. The high-voltage signal referred to in the invention not only refers to the signal guided by the relay adhesion detection, but also includes the signal detected by the shunt, the insulation detection signal and the like, and the low-voltage signal referred to in the invention also refers to the temperature signal, and also includes the signal of each current sensor, the high-voltage interlocking signal and the like.
Wherein, the high-low voltage circuit for realizing the connection mainly comprises: the low-voltage signal line, the high-voltage signal line, the low-voltage control line, the low-voltage power supply line, the high-voltage branch line and the high-voltage bus bar can be selected according to actual connection requirements, and are not described in detail herein.
The control method based on the vehicle power distribution assembly circuit provided by the invention has the advantages that the integration level of the functional modules is high, bus-bar bus failure risk points are few, the full-coverage monitoring of the states of all relays is realized, the multi-temperature point distribution control is implemented by the conductive bus main node and the high-power node, the state change inside the power distribution assembly is effectively monitored when the performance of a vehicle is changed in the power distribution operation process, the node performance attenuation symptom in the power distribution process is reported in advance, and the quality accident risk generated by the node performance attenuation symptom is reduced.
As a control method provided by the present invention, with reference to fig. 3, the executing a temperature hierarchical control strategy according to an on-off state, the temperature data, and an operation mode of a vehicle power distribution system to adjust a state of each relay includes:
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the driving mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, the relays of all branches where the output interfaces are located are closed according to driving electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting three-level faults and adjusting the on-off state of each relay so as to realize the low voltage of the battery;
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the charging mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, the relays of all branches where the output interfaces are located and the relays of the charging input interfaces are closed according to charging electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; and if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting a three-level fault and adjusting the on-off of each relay so as to realize the low voltage of the battery.
As an optional embodiment, the control method provided by the present invention is a temperature hierarchical control strategy formulated according to temperature data returned by a temperature sensor in a secondary circuit signal acquisition module acquired by a BMS:
after the vehicle is electrified at low voltage, the BMS performs self-checking and judges a power distribution mode, and if no serious fault exists, the high-voltage electrifying logic is executed to enter a working state.
The BMS monitors temperature data returned by the temperature sensors in the secondary circuit signal acquisition modules in real time during the work of the vehicle power distribution system, and if the maximum value Tmax in all the temperature data is smaller than or equal to the first threshold Tm, the BMS continuously keeps a monitoring state and the power distribution system continuously operates.
If the maximum value Tmax in the temperature data is larger than the first threshold value Tm but smaller than the second threshold value Tn, the BMS needs to report a secondary fault and execute a battery operation secondary fault strategy, and the vehicle power distribution system has the permission of continuous operation but can perform power reduction operation.
And if the maximum value Tmax in the temperature data is larger than or equal to a second threshold Tn, reporting three-level faults by the BMS, executing a battery operation serious fault strategy, and executing high-voltage power-off logic.
It should be noted that, when the control method provided in the embodiment of the present invention is specifically executed, the control method can be implemented based on the vehicle power distribution assembly circuit described in any of the above embodiments, and details of this embodiment are not described herein.
Based on the content of the foregoing embodiment, as an alternative embodiment, the present invention further provides a work vehicle, where the work vehicle includes the vehicular power distribution assembly circuit provided in any one of the foregoing embodiments.
According to the working vehicle, the adopted vehicle power distribution assembly circuit, the control method and the working vehicle, the integration level of functional modules is high, bus-bar bus failure risk points are few, the state full-coverage monitoring of all relays is realized, the multi-temperature point distribution control is implemented by the conductive bus main node and the high-power node, the state change inside the power distribution assembly during the performance change in the vehicle power distribution operation process is effectively monitored, the node performance attenuation symptom in the power distribution process is reported in advance, and the quality accident risk generated by the node performance attenuation symptom is reduced.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. An automotive power distribution assembly circuit, comprising: the system comprises a high-voltage battery, a battery management system main control module BMS, an external high-voltage interface unit, a power distribution unit and a detection acquisition unit which are integrated in the same space;
the external high-voltage interface unit comprises a plurality of groups of high-voltage input and output interfaces, each group of high-voltage input and output interfaces comprises a negative electrode interface and a positive electrode interface, all the positive electrode interfaces are connected to a first bus bar, all the negative electrode interfaces are connected to a second bus bar, the first bus bar is connected to a high-voltage positive electrode interface of the high-voltage battery, and the second bus bar is connected to a high-voltage negative electrode interface of the high-voltage battery;
the power distribution unit at least comprises a relay configured on a branch where each group of the high-voltage input/output interfaces is located;
the detection acquisition unit at least comprises a node arranged from the high-voltage battery to the first bus bar, a node arranged from the high-voltage battery to the second bus bar, a node with each positive electrode interface connected to the first bus bar, a node with each negative electrode interface connected to the second bus bar, and a temperature sensor at least at one node in the nodes of each negative electrode interface and each positive electrode interface, wherein each temperature sensor uploads the temperature data of the node to the BMS;
and the BMS controls the on-off of each relay according to the temperature data.
2. The vehicle power distribution assembly circuit of claim 1, wherein the detection and acquisition unit further comprises a primary circuit signal acquisition module;
the first-stage circuit signal acquisition module comprises: the relay adhesion collection end points are arranged on the branch where each group of high-voltage input and output interfaces are located, each relay adhesion collection end point is connected to a relay adhesion collection port on the BMS and used for collecting the on-off state of the relay on the branch where each group of high-voltage input and output interfaces are located and uploading the collected on-off state to the BMS.
3. The vehicle power distribution assembly circuit according to claim 1, wherein a high-voltage positive interface of the high-voltage battery and a high-voltage negative interface of the high-voltage battery are both designed in a redundant manner;
a positive manual maintenance switch MSD is connected in series between the first bus bar and each high-voltage positive interface of the high-voltage battery; two adjacent MSDs are arranged in an interlocking mode, and a high-voltage interlocking acquisition end point is arranged on a wiring terminal of each MSD;
each high-voltage interlocking collection endpoint is respectively connected to a high-voltage interlocking collection port on the BMS, so that the BMS can determine whether the MSD acts correctly or not, and the first bus bar is communicated with at most one high-voltage positive electrode interface of the high-voltage battery.
4. The electrical distribution assembly circuit for vehicle of claim 1, wherein the plurality of sets of high voltage input and output interfaces comprises: at least one set of charging input interfaces, at least one set of accessory interfaces, and at least one set of output interfaces.
5. The vehicle power distribution assembly circuit according to claim 4, wherein a high-voltage interlocking acquisition terminal is respectively arranged on the negative electrode interface and the positive electrode interface of each group of output interfaces;
each high-voltage interlocking acquisition terminal is connected to a high-voltage interlocking acquisition port on the BMS respectively, so that the BMS can determine whether a high-voltage loop is constructed between the negative electrode interface and the positive electrode interface.
6. The automotive power distribution assembly circuit of claim 1, further comprising: an external low pressure port unit and an internal low pressure port;
the external low-voltage port unit comprises a whole vehicle low-voltage port and an auxiliary low-voltage port;
the high voltage battery interacts with the BMS through the internal low voltage port.
7. The electrical distribution assembly circuit for vehicles of claim 1, wherein the high voltage battery further comprises a heating auxiliary positive interface with redundant design;
the branch where the positive electrode interface of each heating auxiliary circuit is located is connected to a first bus bar in a parallel mode through a heating auxiliary circuit relay;
a fuse and a heating auxiliary circuit relay adhesion acquisition endpoint are arranged between the heating auxiliary circuit positive electrode interface and the first bus bar;
each heating auxiliary road relay is connected to a relay control interface on the BMS, and each heating auxiliary road relay adhesion acquisition endpoint is connected to a relay adhesion acquisition port on the BMS.
8. The vehicle power distribution assembly circuit of claim 7, wherein a shunt module is connected in series between the high voltage negative interface of any of the high voltage batteries and the second bus bar; the shunt module uploads the collected high-voltage battery working current to the BMS;
and a current sensor is arranged between any one of the heating auxiliary way negative electrode interfaces and the second bus bar, and the current sensor uploads the collected heating auxiliary way current to the BMS.
9. A control method applied to a BMS in the power distribution assembly circuit for a vehicle according to any one of claims 1 to 8, comprising:
acquiring the on-off state of a relay on a branch where each group of high-voltage input/output interfaces are located and the temperature data of a node where each temperature sensor is located;
and executing a temperature grading control strategy according to the on-off state, the temperature data and the operation mode of the vehicle power distribution system so as to adjust the state of each relay.
10. The control method of claim 9, wherein said executing a temperature staging control strategy to adjust the state of each of the relays based on the on-off state, the temperature data, and an operating mode of a vehicle power distribution system comprises:
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the running mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, relays of branches where all output interfaces are located are closed according to running electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off state of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting a three-level fault and adjusting the on-off of each relay so as to realize the low voltage of the battery;
under the condition that the low-voltage electrification of a vehicle power distribution system is determined and the running mode is the charging mode, if the maximum value in the temperature data is smaller than or equal to a first threshold value, the relays of all branches where the output interfaces are located and the relays of the charging input interfaces are closed according to charging electrification control logic; if the maximum value in the temperature data is larger than a first threshold value and smaller than a second threshold value, reporting a secondary fault and adjusting the on-off of each relay so as to enable the battery to run in a power-down mode until the maximum value in the temperature data is smaller than or equal to the first threshold value; and if the maximum value in the temperature data is larger than or equal to a second threshold value, reporting a three-level fault and adjusting the on-off of each relay so as to realize the low voltage of the battery.
11. A work vehicle comprising a vehicular power distribution assembly circuit according to any of claims 1-8.
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| CN116176302A (en) * | 2023-03-29 | 2023-05-30 | 奇瑞新能源汽车股份有限公司 | Dual-battery system, electric automobile and charging method thereof |
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| CN102222973A (en) * | 2011-06-14 | 2011-10-19 | 湘潭世通电气有限公司 | Direct-current power supply device for variable-propeller controller of large wind motor |
| CN203713584U (en) * | 2014-02-13 | 2014-07-16 | 安徽江淮汽车股份有限公司 | Battery cut-off unit of power battery pack |
| CN206524388U (en) * | 2017-02-08 | 2017-09-26 | 浙江安美科技有限公司 | A kind of electric automobile power battery high voltage control case |
| CN206773109U (en) * | 2017-06-07 | 2017-12-19 | 苏州协鑫新能源运营科技有限公司 | A kind of failure anticipation device of photovoltaic combiner box |
| CN107985080A (en) * | 2017-12-22 | 2018-05-04 | 珠海银隆电器有限公司 | Power cell of vehicle system high voltage distribution installation and power cell of vehicle system |
| CN108944459A (en) * | 2018-06-12 | 2018-12-07 | 中通客车控股股份有限公司 | A kind of high-voltage safety monitoring system and control method |
| CN110774937A (en) * | 2019-10-30 | 2020-02-11 | 电子科技大学 | A vehicle-mounted centralized power distribution parallel battery management system |
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| CN116176302A (en) * | 2023-03-29 | 2023-05-30 | 奇瑞新能源汽车股份有限公司 | Dual-battery system, electric automobile and charging method thereof |
| CN116176302B (en) * | 2023-03-29 | 2025-08-01 | 奇瑞新能源汽车股份有限公司 | Dual-battery system, electric automobile and charging method thereof |
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