CN111775706A - Power battery low-voltage manual maintenance switch control system and vehicle - Google Patents
Power battery low-voltage manual maintenance switch control system and vehicle Download PDFInfo
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- CN111775706A CN111775706A CN202010550648.1A CN202010550648A CN111775706A CN 111775706 A CN111775706 A CN 111775706A CN 202010550648 A CN202010550648 A CN 202010550648A CN 111775706 A CN111775706 A CN 111775706A
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- voltage
- relay
- battery pack
- power
- manual maintenance
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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
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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
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a power battery low-voltage manual maintenance switch control system and a vehicle, comprising: the system comprises a power battery pack, a battery pack circuit breaking unit, a battery management unit and a low-voltage manual maintenance switch; the power battery pack is connected with the battery pack circuit breaking unit, and the battery pack circuit breaking unit is used for completing the internal power distribution function of the power battery and controlling the voltage and the current of a high-voltage output loop of the power battery; the low-voltage manual maintenance switch is connected with an interlocking loop of the battery management unit and a battery management unit awakening power supply loop in series, and is connected with at least two high-voltage acquisition points in the battery pack breaking unit; the battery pack circuit breaking unit is connected with the battery management unit, and the battery management unit is used for controlling a relay and high-voltage loop detection in the battery pack circuit breaking unit. Compared with the traditional high-voltage MSD, the invention has smaller volume and lighter weight, the exposed part does not occupy the space of the whole vehicle, and the cost is low.
Description
Technical Field
The invention relates to the technical field of control of a low-voltage manual maintenance switch of a power battery, in particular to a control system of the low-voltage manual maintenance switch of the power battery and a vehicle.
Background
In recent years, with the vigorous national advance of the development of new energy automobiles, the development of power batteries is also greatly driven, and the safety of the power batteries is more and more important. In order to ensure the safety of the power battery during use and after-sales repair, a Manual Service Disconnect (MSD) has become the mainstream configuration of the power battery.
The traditional control system with the MSD is a high-voltage MSD control system, a fuse and a high-voltage copper bar are arranged in the high-voltage MSD, the effect of short-circuit protection can be achieved after the opposite insertion is completed, the effect of disconnecting the high-voltage bus bar can be achieved when the plug is pulled out, and the high-voltage safety of the power battery is guaranteed. However, the high-voltage MSD has a complex structure, and the cost is increased due to a large volume of the built-in fuse.
Therefore, a technical scheme for providing a low-voltage manual maintenance switch control system for a power battery is urgently needed, and the economic problems that a traditional high-voltage MSD built-in fuse is large in size, exposed outside a power battery pack, occupies the whole vehicle space and is high in cost can be solved; after the high-voltage MSD is cancelled, the safety problem that the high voltage is disconnected cannot be completely guaranteed in the using or maintaining process of the power battery; and a technical problem that the voltage and the insulation resistance value of the whole pack cannot be read after a Battery Management System (BMS) or a Battery Management Unit (BMU) is dormant.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a power battery low-voltage manual maintenance switch control system, which comprises: the system comprises a power battery pack, a battery pack circuit breaking unit, a battery management unit and a low-voltage manual maintenance switch;
the power battery pack is connected with the battery pack circuit-breaking unit, and the battery pack circuit-breaking unit is used for completing the internal power distribution function of the power battery and controlling the voltage and the current of a high-voltage output loop of the power battery;
the low-voltage manual maintenance switch is connected in series with an interlocking loop of the battery management unit and a battery management unit wake-up power supply loop, and is connected with at least two high-voltage acquisition points inside the battery pack disconnection unit;
the battery pack circuit breaking unit is connected with the battery management unit, and the battery management unit is used for controlling a relay and high-voltage loop detection in the battery pack circuit breaking unit.
Further, still include: a vehicle control unit;
and the vehicle control unit is in control connection with the battery management unit.
Further, still include: a controller;
the controller is connected with the vehicle control unit, the controller is also in control connection with the battery pack circuit-breaking unit, and the vehicle control unit is used for sending a fault instruction to the controller when the power battery pack breaks down, so that the controller stops the work of the vehicle high-voltage electric appliance.
Further, the battery pack disconnection unit includes: the device comprises a first relay, a second relay, a third relay and a pre-charging resistor; one end of the first relay and one end of the third relay are both connected with a first electrode of the power battery pack, the other end of the first relay is respectively connected with one end of the pre-charging resistor and a second electrode of the high-voltage output circuit, and the other end of the third relay is connected with the other end of the pre-charging resistor; one end of the second relay is connected with a third electrode of the power battery pack, and the other end of the second relay is connected with a fourth motor of the high-voltage output circuit;
the first relay, the second relay and the third relay are all connected with the battery management unit, and the battery management unit is used for detecting whether the power battery pack has faults or not according to the states of the first relay, the second relay and the third relay.
Further, the second relay is a pre-charge relay.
Further, the high-voltage output circuit includes: and the high-voltage output sub-loops are mutually connected in parallel.
Furthermore, each high-voltage output sub-loop is connected with the battery management unit;
the battery management unit is used for collecting the current value and/or the voltage value of each high-voltage output sub-loop.
Further, the battery pack disconnection unit further includes: one end of the shunt is connected with one end of the second relay, and one end of the shunt is connected with a third electrode of the power battery pack; and the acquisition end of the shunt is connected with the battery management unit.
Further, still include: a high-voltage sampling device;
the high-voltage sampling equipment is connected with the low-voltage manual maintenance switch.
In another aspect, the invention provides a vehicle provided with the power battery low-voltage manual maintenance switch control system.
The implementation of the invention has the following beneficial effects:
1) compared with the traditional high-pressure MSD, the volume is smaller, the weight is lighter, the exposed part does not occupy the space of the whole vehicle, and the cost is low;
2) after MSD is disconnected, the BMS or BMU is disconnected to wake up the power supply, and the BMS or BMU controls the relay to be disconnected, so that the high-voltage loop is disconnected;
3) a high-voltage insulation collection point is arranged inside, a high-voltage detection point in the BDU can be led into the low-voltage MSD, and the high-voltage insulation resistance value of the power battery pack is read through external equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural diagram of a control system of a low-voltage manual maintenance switch for a power battery according to an embodiment of the present invention;
FIG. 2 is a block diagram of another power battery low-voltage manual maintenance switch control system according to an embodiment of the present invention;
the system comprises a power battery pack 1, a battery pack 2, a battery pack circuit breaking unit 3, a battery management unit 4, a low-voltage manual maintenance switch 5, a vehicle control unit 6, a controller 7 and a high-voltage sampling device 7;
21-a first relay, 22-a second relay, 23-a third relay, 24-a pre-charging resistor, 25-a high-voltage output loop and 26-a current divider;
251-a first high-voltage output sub-circuit, 252-a second high-voltage output sub-circuit, 253-a third high-voltage output sub-circuit, 254-a fourth high-voltage output sub-circuit;
255-first high pressure sampling line, 256-second high pressure sampling line, 257-third high pressure sampling line, 258-fourth high pressure sampling line.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
It should be noted that when an element is referred to as being "connected" to another element, it can be either a circuit connection or a communication connection.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Fig. 1 is a structural diagram of a control system for a low-voltage manual maintenance switch of a power battery according to an embodiment of the present invention, and as shown in fig. 1, the present invention provides a control system for a low-voltage manual maintenance switch of a power battery, including: the system comprises a power battery pack 1, a battery pack breaking unit 2, a battery management unit 3 and a low-voltage manual maintenance switch 4;
the power battery pack 1 is connected with the battery pack circuit-breaking unit 2, and the battery pack circuit-breaking unit 2 is used for completing the internal power distribution function of the power battery and controlling the voltage and the current of a high-voltage output loop 25 of the power battery;
the low-voltage manual maintenance switch 4 is connected in series with an interlocking loop of the battery management unit 3 and a power supply loop awakened by the battery management unit 3, and meanwhile, the low-voltage manual maintenance switch 4 is connected with at least two high-voltage acquisition points inside the battery pack circuit breaking unit 2;
the battery pack circuit breaking unit 2 is connected with the battery management unit 3, and the battery management unit 3 is used for controlling a relay and high-voltage loop detection inside the battery pack circuit breaking unit 2.
Specifically, the power battery pack 1 may include multiple groups of power batteries connected in series, and each group of power batteries may include multiple single power batteries connected in series. The rated voltage of the single power battery is not specified in the specification, and can be set according to actual needs. In some possible embodiments, the power battery pack 1 may be provided in the pack breaking unit 2. It can be understood that the power battery pack 1 may also be disposed outside the battery pack disconnection unit 2, and the power battery pack 1 may be connected to the power interface of the battery pack disconnection unit 2 to provide power for the battery pack disconnection unit 2 and other electrical devices of the vehicle.
Specifically, the battery pack disconnection unit 2 may be configured to complete an internal power distribution function of the power battery, and control the voltage and the current of the high-voltage output circuit 25 of the power battery.
Illustratively, when the power battery pack 1 supplies power to four electrical appliances (M, N, O and P electrical appliances, respectively), the fuse with the rated current of 40A, N corresponds to the fuse with the rated current of 200A corresponding to the fuse with the rated current of 40A, O and the fuse with the rated current of 350A corresponding to P, the battery pack disconnection unit 2 can complete current distribution to the power battery pack 1 according to the rated currents of M, N, O and P electrical appliances or other working parameters, and safe operation of different electrical appliances is guaranteed.
Specifically, the battery management unit 3 may be the above-mentioned BMS or BMU, and the battery management unit 3 may monitor the operating parameters of the power supply circuits of different electrical appliances in real time, so as to monitor the safety of the power supply line. The connection mode of the battery management unit 3 and the battery pack circuit-breaking unit 2 is circuit connection and communication connection, the battery pack circuit-breaking unit 2 provides power for the battery management unit 3, and the battery management unit 3 monitors and controls the operation parameters of electronic components in the battery pack circuit-breaking unit 2.
Specifically, the low-voltage manual maintenance switch 4 is connected in series with an interlocking loop of the BMS or the BMU and a wake-up power supply loop of the BMS or the BMU, and is connected with a plurality of high-voltage acquisition points inside the BDU. The battery management unit 3 is used to supply electrical energy to the low voltage manual maintenance switch 4. The low-voltage manual maintenance switch 4 is further connected with the battery pack circuit breaking unit 2 through a first high-voltage sampling line 255, a second high-voltage sampling line 256, a third high-voltage sampling line 257 and a fourth high-voltage sampling line 258, and a high-voltage detection interface used for being connected with high-voltage detection equipment can be arranged inside the low-voltage manual maintenance switch 4, so that a user can conveniently detect the internal voltage value of the power battery pack.
On the basis of the above embodiments, in an embodiment of this specification, the power battery low-voltage manual maintenance switch control system further includes: a vehicle control unit 5;
the vehicle control unit 5 is connected with the battery management unit 3.
Specifically, the vehicle control unit 5 is in communication connection with the battery management unit 3, and the vehicle control unit 5 is used for sending out a prompt to remind the vehicle power battery pack 1 of maintenance when an internal fault occurs in the use process of the power battery pack 1. And the vehicle controller 5 is also used for processing and distributing information of each electrical subunit in the running of the whole vehicle. And the vehicle control unit 5 is also used for acquiring the voltage of the high-voltage loop, and judging the connection state of the whole package, the relay and the fuse through the voltage value.
On the basis of the above embodiments, in an embodiment of this specification, the power battery low-voltage manual maintenance switch control system further includes: a controller 6;
the controller 6 is connected with the vehicle control unit 5, and the controller 6 is also connected with the battery pack circuit-breaking unit 2.
Specifically, the controller 6 may be a two-in-one controller or a three-in-one controller 6, the controller 6 is in communication connection with the vehicle control unit 5, and the controller 6 is further electrically connected with the battery pack disconnection unit 2. The battery pack disconnection unit 2 is used to supply the controller 6 with electric power. The vehicle control unit 5 is used for sending a fault instruction to the controller 6 when the power battery pack 1 fails, so that the controller 6 stops the work of the high-voltage electric appliance of the vehicle. Wherein the three-in-one controller 6 includes a motor controller 6, a DC/DC, an electric compressor power supply or a PDU (power distribution unit). The two-in-one controller 6 may include a controller 6, a DC/DC or electric compressor power supply or PDU, or the like.
On the basis of the above embodiment, fig. 2 is a structural diagram of another power battery low-voltage manual maintenance switch control system provided in the embodiment of the present invention; as shown in fig. 2, in one embodiment of the present disclosure, the battery pack disconnection unit 2 includes: a first relay 21, a second relay 22, a third relay 23, and a pre-charge resistor 24; one end of the first relay 21 and one end of the third relay 23 are both connected with the first electrode of the power battery pack 1, the other end of the first relay 21 is respectively connected with one end of the pre-charging resistor 24 and the second electrode of the high-voltage output circuit 25, and the other end of the third relay 23 is connected with the other end of the pre-charging resistor 24; one end of the second relay 22 is connected with the third electrode of the power battery pack 1, and the other end of the second relay 22 is connected with the fourth motor of the high-voltage output circuit 25;
the first relay 21, the second relay 22 and the third relay 23 are all connected with the battery management unit 3, and the battery management unit 3 is used for detecting whether the power battery pack 1 is in fault according to the states of the first relay 21, the second relay 22 and the third relay 23.
Specifically, the rated parameters of the first relay 21, the second relay 22, the third relay 23 and the pre-charge resistor 24 are not specifically limited in the embodiment of the present specification, and may be set according to actual needs.
The first relay 21 and the third relay 23 are connected to the first electrode of the power battery pack 1 and used for controlling the output of the first electrode of the power battery pack 1, and the second relay 22 is connected to the third electrode of the power battery pack 1 and used for controlling the output of the third electrode of the power battery pack 1.
The first electrode and the second electrode are the same electrode, the third electrode and the fourth electrode are the same electrode, and the first electrode and the third electrode are opposite electrodes. The number of the first relay 21, the second relay 22, the third relay 23 and the pre-charging resistor 24 in the BDU is not fixed, and may be set according to the number of external high-voltage devices and control requirements, and it is understood that the control requirements may include: individual control and multiple simultaneous controls.
Specifically, the battery management unit 3 may be connected to the first electrode and the third electrode of the power battery pack 1, respectively, for monitoring the operating parameters of the power battery pack 1.
Wherein, the first relay 21 is a MAIN POSITIVE relay (MAIN POSITIVE relay), the second relay 22 is a pre-charge relay (precharge relay), the third relay 23 is a MAIN negative relay (MAIN negative relay), the loop connected with the POSITIVE pole of the power battery pack 1 is a MAIN POSITIVE CIRCUIT (MAIN POSITIVE CIRCUIT), the loop connected with the negative pole of the power battery pack 1 is a MAIN negative CIRCUIT (MAIN NEGATIVE CIRCUIT), ORGE LINES, the connecting line of the shunt 26 and the battery management unit 3 in the figure is a current signal collecting line, and the other thin LINES are high voltage sampling LINES (hv sampling LINES);
the battery pack disconnection unit 2 includes six bus connection interfaces (bus connection interfaces), and the shunt 26 is disposed in one of the bus connection interfaces; the battery pack disconnection unit 2 further comprises two low-voltage connectors (lvcon connectors), wherein one of the low-voltage connectors is a six-pin connector and is used for connecting the battery management unit 3, and the other low-voltage connector is a twelve-pin connector and is also used for connecting the battery management unit 3; the first high-voltage output sub-circuit 251, the second high-voltage output sub-circuit 252, the third high-voltage output sub-circuit 253, and the fourth high-voltage output sub-circuit 254 are all connected to the high-voltage electric devices through high-voltage connectors (hvconnectors).
The BDU provided by the embodiments of the present disclosure is internally provided with a first relay 21, a second relay 22, and a third relay 23, which may be added as needed if there are multiple external high-voltage devices and they need to be controlled individually, and it is understood that the first relays 21 are connected in parallel, the third relays 23 are connected in parallel, and the second relays 22 are connected in parallel with the first relays 21.
On the basis of the above embodiments, in one embodiment of the present specification, the second relay 22 is a pre-charge relay.
Specifically, the first relay 21 and the third relay 23 may be main relays; the second relay 22 may be a pre-charge relay. It can be understood that the operating parameters of the pre-charging relay can be set according to actual needs.
On the basis of the above embodiments, in one embodiment of the present specification, the high-voltage output circuit 25 includes: and the high-voltage output sub-loops are mutually connected in parallel.
Specifically, each high-voltage output sub-loop may include at least one fuse, and rated parameters of the fuse may be set according to actual needs. Each high voltage output sub-loop may output the same or different current or voltage.
On the basis of the above embodiments, in one embodiment of the present specification, each high voltage output sub-loop is connected to the battery management unit 3;
the battery management unit 3 is used for collecting the current value and/or the voltage value of each high-voltage output sub-loop.
Specifically, both ends of each high-voltage output sub-circuit may be connected to the battery management unit 3, and the battery management unit 3 may be configured to monitor the operating voltage or the operating current of the high-voltage output sub-circuit.
On the basis of the above embodiment, in an embodiment of the present specification, the battery pack disconnection unit 2 further includes: a shunt 26, one end of the shunt 26 is connected with one end of the second relay 22, and one end of the shunt 26 is connected with a third electrode of the power battery pack 1; the collecting end of the shunt 26 is connected with the battery management unit 3.
The battery management unit 3 is configured to detect a current value of the shunt 26.
Specifically, the battery management unit 3 is used to monitor the operating current of the power battery pack 1 through the shunt 26.
On the basis of the above embodiments, in an embodiment of this specification, the power battery low-voltage manual maintenance switch control system further includes: a high-voltage sampling device 7;
the high-voltage sampling device 7 is connected with the low-voltage manual maintenance switch 4.
Specifically, the high-voltage sampling device 7 is used for collecting high-voltage collection point voltage and insulation resistance inside the low-voltage manual maintenance switch 4. The high-voltage sampling device 7 is not particularly limited in the embodiments of the present specification.
The working principle of the power battery low-voltage manual maintenance switch control system provided by the embodiment of the specification can be as follows:
1. when the power battery pack 1 has an internal fault in the using process, the BMS detects the fault of the power battery pack 1 and sends an instruction to the vehicle control unit 5 and the three-in-one controller 6;
2. the vehicle controller 5 sends out an instruction to remind a vehicle power battery to be maintained, and the three-in-one controller 6 stops the work of high-voltage electric appliances of the vehicle after receiving the instruction;
3. disconnecting the low-voltage MSD, disconnecting the BMS awakening power supply loop and the interlocking loop, and controlling the main relay to be disconnected after the BMS detects that the awakening power supply loop is disconnected to finish the disconnection of the high-voltage loop;
4. and reading the internal voltage and the insulation resistance value of the power battery pack 1 through external sampling equipment, and confirming the state of the power battery pack 1.
At present, the fuse of the power battery pack 1 is basically integrated in a battery pack disconnection Unit 2 (BDU), and the BDU is specially designed for the inside of the power battery pack 1 and is also a kind of high-voltage distribution box. The manual maintenance switch control system of power battery low pressure that this specification embodiment provided, awakens power supply with BMS or BMU and connects in series in MSD plug and socket, can break off BMS or BMU's awakening power supply through the plug of disconnection MSD then, breaks off high-voltage circuit main relay, accomplishes the high-voltage circuit and opens circuit, and the built-in power battery high voltage insulation check point of this MSD simultaneously can read power battery group 1 internal voltage value and insulation resistance through external equipment under BMS or BMU dormancy condition.
The implementation of the invention further optimizes the size, quality and cost of the low-voltage manual maintenance switch 4; a low-voltage wake-up circuit of the battery management unit 3 is newly added, the BMU is switched off to wake up power supply through the disconnection of MSD, and a high-voltage main relay is switched off; the parameters such as voltage, insulation resistance and the like in the power battery pack 1 can be read by external physical equipment through the low-voltage manual maintenance switch 4;
in another aspect, the invention provides a vehicle provided with the power battery low-voltage manual maintenance switch control system.
Because the vehicle is provided with the power battery low-voltage manual maintenance switch control system, the vehicle has the technical effect of the power battery low-voltage manual maintenance switch control system, and the description is omitted.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A power battery low pressure manual maintenance switch control system characterized in that includes: the system comprises a power battery pack (1), a battery pack disconnection unit (2), a battery management unit (3) and a low-voltage manual maintenance switch (4);
the power battery pack (1) is connected with the battery pack circuit breaking unit (2), and the battery pack circuit breaking unit (2) is used for completing the internal power distribution function of the power battery and controlling the voltage and the current of a high-voltage output loop (25) of the power battery;
the low-voltage manual maintenance switch (4) is connected in series with an interlocking loop of the battery management unit (3) and a power supply wake-up loop of the battery management unit (3), and meanwhile, the low-voltage manual maintenance switch (4) is connected with at least two high-voltage acquisition points inside the battery pack circuit breaking unit (2);
the battery pack circuit breaking unit (2) is connected with the battery management unit (3), and the battery management unit (3) is used for controlling a relay and high-voltage loop detection in the battery pack circuit breaking unit (2).
2. The power cell low voltage manual maintenance switch control system of claim 1, further comprising: a vehicle control unit (5);
and the vehicle control unit (5) is in control connection with the battery management unit (3).
3. The power cell low voltage manual maintenance switch control system of claim 2, further comprising: a controller (6);
the controller (6) with vehicle control unit (5) are connected, controller (6) still with battery package circuit break unit (2) control connection, vehicle control unit (5) are used for when power battery group (1) breaks down to controller (6) send the trouble instruction, so that controller (6) stop whole car high voltage with electrical apparatus work.
4. The power cell low voltage manual maintenance switch control system according to claim 1, characterized in that the battery pack disconnection unit (2) comprises: a first relay (21), a second relay (22), a third relay (23) and a pre-charging resistor (24); one end of the first relay (21) and one end of the third relay (23) are both connected with a first electrode of the power battery pack (1), the other end of the first relay (21) is respectively connected with one end of the pre-charging resistor (24) and a second electrode of the high-voltage output circuit (25), and the other end of the third relay (23) is connected with the other end of the pre-charging resistor (24); one end of the second relay (22) is connected with a third electrode of the power battery pack (1), and the other end of the second relay (22) is connected with a fourth motor of the high-voltage output loop (25);
the first relay (21), the second relay (22) and the third relay (23) are connected with the battery management unit (3), and the battery management unit (3) is used for detecting whether the power battery pack (1) is in fault according to the states of the first relay (21), the second relay (22) and the third relay (23).
5. The power cell low voltage manual maintenance switch control system according to claim 4, characterized in that said second relay (22) is a pre-charge relay.
6. The power cell low voltage manual maintenance switch control system according to claim 1, wherein said high voltage output circuit (25) comprises: and the high-voltage output sub-loops are mutually connected in parallel.
7. The power battery low-voltage manual maintenance switch control system according to claim 1, characterized in that each high-voltage output sub-loop is connected with the battery management unit (3);
the battery management unit (3) is used for collecting the current value and/or the voltage value of each high-voltage output sub-loop.
8. The power cell low voltage manual maintenance switch control system according to claim 4, characterized in that the battery pack disconnection unit (2) further comprises: one end of the shunt (26) is connected with one end of the second relay (22), and one end of the shunt (26) is connected with the third electrode of the power battery pack (1); the collection end of the shunt (26) is connected with the battery management unit (3).
9. The power cell low voltage manual maintenance switch control system of claim 1, further comprising: a high-voltage sampling device (7);
the high-voltage sampling equipment (7) is connected with the low-voltage manual maintenance switch (4).
10. A vehicle provided with a power cell low voltage manual maintenance switch control system according to any one of claims 1-9.
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| CN202010550648.1A CN111775706A (en) | 2020-06-16 | 2020-06-16 | Power battery low-voltage manual maintenance switch control system and vehicle |
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| CN202010550648.1A CN111775706A (en) | 2020-06-16 | 2020-06-16 | Power battery low-voltage manual maintenance switch control system and vehicle |
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