CN217778405U - Electric loop of power distribution unit - Google Patents
Electric loop of power distribution unit Download PDFInfo
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- CN217778405U CN217778405U CN202221072076.1U CN202221072076U CN217778405U CN 217778405 U CN217778405 U CN 217778405U CN 202221072076 U CN202221072076 U CN 202221072076U CN 217778405 U CN217778405 U CN 217778405U
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Abstract
The utility model discloses an electric loop of a power distribution unit, which comprises a main positive interface of a battery, a charge-discharge circuit and a positive load interface which are connected in series in sequence; the charging and discharging circuit is used for controlling the on-off of a charging loop and a discharging loop of the battery and is also used for blocking feedback current from flowing from a main positive interface of the battery to a positive interface of a load when the charging loop is controlled to be conducted; when the discharging loop is controlled to be conducted, the feedback current is blocked from flowing from the positive interface of the load to the total positive interface of the battery. The utility model discloses can solve the battery and produce the technical problem of repayment electric current at the charge-discharge in-process.
Description
Technical Field
The utility model relates to a power distribution unit's technical field especially relates to a power distribution unit electric loop.
Background
The new energy automobile relay is a control element and is a core element of the new energy automobile. The new energy automobile mainly realizes the charging and discharging of the battery by controlling the corresponding relay in the operation process. However, in both charging and discharging processes, a reverse feedback current is easily generated, and the generated feedback current may damage components in the battery.
For the damage of each element in the battery caused by the generation of feedback current in the charging and discharging process of the battery, the currently adopted method only controls the feedback current through the whole vehicle end, and a small-electric-quantity vehicle like an arm vehicle does not generally need to charge the battery during discharging, so that a feedback device is not generally arranged, and the current feedback phenomenon cannot be avoided when the battery is in a full-charge state or at a subzero temperature.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric loop of power distribution unit to solve the battery and produce the technical problem of repayment electric current at the charge-discharge in-process.
According to an aspect of the utility model provides a power distribution unit electrical loop, include:
the battery main positive interface, the charge-discharge circuit and the load positive interface are sequentially connected in series;
the charging and discharging circuit is used for controlling the on-off of a charging loop and a discharging loop of the battery and is also used for blocking feedback current from flowing to the load positive interface from the battery total positive interface when the charging loop is controlled to be conducted; when the discharge loop is controlled to be conducted, feedback current is blocked from flowing from the load positive interface to the battery main positive interface.
Optionally, the charging and discharging circuit includes a charging circuit and a discharging circuit connected in series;
the charging circuit comprises a charging relay switch and a first diode which are connected in parallel, wherein the anode of the first diode is connected with the first end of the charging relay switch, and the cathode of the first diode is connected with the second end of the charging relay switch;
the discharging circuit comprises a discharging relay switch and a second diode which are connected in parallel, the negative pole of the second diode is connected with the first end of the discharging relay switch, and the positive pole of the second diode is connected with the second end of the discharging relay switch.
Optionally, a first end of the charging relay switch is connected to the battery main positive interface, a second end of the charging relay switch is connected to a first end of the discharging relay switch, and a second end of the discharging relay switch is connected to the load positive interface;
or the first end of the discharging relay switch is connected with the positive total interface of the battery, the second end of the discharging relay switch is connected with the first end of the charging relay switch, and the second end of the charging relay switch is connected with the positive load interface.
Optionally, the charging and discharging circuit includes a charging circuit and a discharging circuit connected in parallel;
the charging circuit comprises a charging relay switch and a third diode which are connected in series;
the first end of the charging relay switch is connected with the main positive interface of the battery, the second end of the charging relay switch is connected with the negative electrode of a third diode, and the negative electrode of the third diode is connected with the positive interface of the load; or the second end of the charging relay switch is connected with the positive load interface, the first end of the charging relay switch is connected with the positive pole of the third diode, and the negative pole of the third diode is connected with the total positive battery interface;
the discharging circuit comprises a discharging relay switch and a fourth diode which are connected in series;
the first end of the discharging relay switch is connected with the battery main positive interface, the second end of the discharging relay switch is connected with the anode of the fourth diode, and the cathode of the second diode is connected with the load positive interface; or the second end of the discharging relay switch is connected with the positive load interface, the first end of the discharging relay switch is connected with the negative electrode of the fourth diode, and the positive electrode of the fourth diode is connected with the total positive battery interface.
Optionally, the emergency stop protection circuit is further included;
the emergency stop protection circuit comprises a pre-charging relay coil, a battery management system and an emergency stop switch module;
a charging control interface of the battery management system is connected with one end of the charging relay coil, and the other end of the charging relay coil is connected with a first end of the emergency stop switch module;
a discharging control interface of the battery management system is connected with one end of the discharging relay coil, and the other end of the discharging relay coil is connected with the first end of the emergency stop switch module;
a pre-charging control interface of the battery management system is connected with one end of the pre-charging relay coil, and the other end of the pre-charging relay coil is connected with a first end of the emergency stop switch module;
and the second end of the emergency stop switch module is connected with a positive master control power supply interface of the battery management system.
Optionally, the charging relay further comprises a first indicating unit connected in parallel with the charging relay coil, a second indicating unit connected in parallel with the discharging relay coil, and a third indicating unit connected in parallel with the pre-charging relay coil.
Optionally, a pre-charging circuit is further included;
the battery main positive interface, the pre-charging circuit and the load positive interface are sequentially connected in series;
the pre-charging circuit comprises a pre-charging relay switch and a pre-charging resistor which are connected in series.
Optionally, the system further comprises a low-voltage power supply circuit;
the low-voltage power supply circuit comprises a DC/DC converter, a key switch and a low-voltage power supply port;
the first end of the key switch is connected with the first end of the battery master positive interface, and the second end of the key switch is connected with the positive input interface of the DC/DC converter;
and the positive output interface of the DC/DC converter is respectively connected with the positive input interface of the low-voltage power supply port and the positive master control power supply interface of the battery management system, and the negative output interface of the DC/DC converter is respectively connected with the negative input interface of the low-voltage power supply port and the negative master control power supply interface of the battery management system.
Optionally, a heating circuit is further included;
the heating circuit comprises a battery main positive interface, a heating positive relay switch, a fuse and a heating positive interface which are sequentially connected in series;
the positive electrode of the coil of the heating positive relay is connected with the positive electrode control interface of the heating positive relay of the battery management system, and the negative electrode of the coil of the heating positive relay is connected with the negative electrode control interface of the heating positive relay of the battery management system;
the heating positive relay further comprises a fifth indicating unit connected with the heating positive relay coil in parallel.
Optionally, the system further comprises a battery total negative interface, a shunt, a total negative relay switch and a load negative interface which are sequentially connected in series;
the heating device also comprises a heating negative relay switch and a heating negative interface which are connected in series;
the first end of the shunt is connected with the first end of the main negative relay switch, the second end of the main negative relay switch is respectively connected with the load interface and the first end of the heating negative relay switch, and the second end of the heating negative relay switch is connected with the heating negative interface;
the heating device also comprises a fourth indicating unit connected with the total negative relay coil in parallel and a sixth indicating unit connected with the heating negative relay coil in parallel.
According to the technical scheme of the embodiment of the utility model, in the charging process, the charging circuit is controlled to be conducted, and the current flows from the positive load interface to the total positive battery interface through the charging circuit, so as to charge the battery; in addition, the charge and discharge circuit can block the current flowing from the battery positive interface to the load positive interface, and the feedback current is prevented from flowing to the load positive interface. In the discharging process, the discharging circuit is controlled to be conducted, and current flows from the battery total positive interface to the load through the discharging circuit, so that discharging is realized; in addition, the charging and discharging circuit can block the total positive current flowing to the battery from the positive interface of the load, and damage to elements in the battery caused by the fact that feedback current flows to the battery is avoided.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an electrical circuit of a power distribution unit according to an embodiment of the present invention;
fig. 2 is a circuit diagram including a charging circuit and a discharging circuit according to a second embodiment of the present invention;
fig. 3 is another circuit diagram including a charging circuit and a discharging circuit according to a second embodiment of the present invention;
fig. 4 is another circuit diagram of an electrical circuit of a power distribution unit according to an embodiment of the present invention.
Reference numerals: a charge and discharge circuit-1; battery positive interface-2; load positive interface-3; an emergency stop switch module-4; a key switch-5; heating the positive connector-6; low voltage power supply port-7; battery total negative interface-8; heating the negative interface-9; a shunt-10; charging circuit-11 discharging circuit-12; load negative interface-100; an internal communication port-200; adaptation port-300; a whole vehicle communication port-400; charge relay switch-K1; charging relay coil-K11; discharge relay switch-K2; discharge relay coil-K22; a first diode-D1; a second diode-D2; a third diode-D3; a fourth diode-D4; pre-charge relay switch-K3; pre-charge relay coil-K33; a total negative relay switch-K4; total negative relay coil-K44; heating a positive relay switch-K5; heating a positive relay coil-K55; heating a negative relay switch-K6; heating the negative relay coil-K66.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
Example one
Fig. 1 is a diagram for illustrating a dual-purpose power distribution unit according to an embodiment of the present invention, as shown in fig. 1, the power distribution unit includes:
the battery charging and discharging circuit comprises a battery main positive interface 2, a charging and discharging circuit 1 and a load positive interface 3 which are sequentially connected in series;
the battery main positive interface 2 is used for controlling the on-off of a charging loop and a discharging loop of the battery and is also used for blocking feedback current from flowing from the battery main positive interface 2 to the load positive interface 3 when the charging loop is controlled to be conducted; when the discharge loop is controlled to be conducted, the feedback current is blocked from flowing from the load positive interface 3 to the battery total positive interface 2.
The battery total positive interface 2 and the load positive interface 3 are two ports on a positive bus of a power distribution unit in the battery pack respectively. The positive electrode bus also comprises a charge-discharge circuit 1 for controlling the charge and discharge of the battery.
Specifically, a charging circuit in the electrical circuit can be controlled to be switched on and off, and when the charging circuit is controlled to be switched on, current flowing from the load positive interface 3 flows into the battery main positive interface 2 through the charging and discharging circuit 1 to charge the battery. Meanwhile, a corresponding current blocking element can be arranged in the charge and discharge circuit 1, so that the current flowing from the load positive interface 3 to the battery main positive interface 2 can be conducted, and the current flowing from the battery main positive interface 2 to the load positive interface 3 can be blocked.
And the discharging loop in the electrical loop can also be controlled to be switched on and off, when the discharging loop is controlled to be switched on, the current flowing out of the battery main positive interface 2 flows into the load positive interface 3 through the charging and discharging circuit 1, and the discharging of the battery is realized. Meanwhile, a corresponding current blocking element can be arranged in the charging and discharging circuit 1, so that the current flowing into the load positive interface 3 from the battery positive interface 2 can be conducted, and the current flowing to the battery positive interface 2 from the load positive interface 3 can be blocked.
According to the technical scheme of the embodiment of the utility model, in the charging process, the charging circuit is controlled to be conducted, and the current flows from the load positive interface 3 to the battery main positive interface 2 through the charging circuit, so as to charge the battery; in addition, the charging and discharging circuit 1 can block the current flowing from the battery main positive interface 2 to the load positive interface 3, and the feedback current is prevented from flowing to the load positive interface 3. In the discharging process, the discharging circuit is controlled to be conducted, and current flows from the battery total positive interface 2 to the positive load through the discharging circuit, so that discharging is realized; in addition, the charge and discharge circuit 1 can block the total positive current flowing to the battery from the load positive interface 3, and damage to elements in the battery caused by feedback current flowing to the battery is avoided.
Example two
Fig. 2 and fig. 3 are circuit diagrams of a charging circuit and a discharging circuit according to a second embodiment of the present invention. The charge and discharge circuit 1 in fig. 2 includes a charge circuit 11 and a discharge circuit 12 connected in series.
The charging circuit 11 comprises a charging relay switch K1 and a first diode D1 which are connected in parallel, the anode of the first diode D1 is connected with the first end of the charging relay switch K1, and the cathode of the first diode D1 is connected with the second end of the charging relay switch K1.
The discharging circuit 12 includes a discharging relay switch K2 and a second diode D2 connected in parallel, a cathode of the second diode D2 is connected to a first end of the discharging relay switch K2, and an anode of the second diode D2 is connected to a second end of the discharging relay switch K2.
When the battery is charged, current flows in through the load positive interface 3, and then flows to the battery positive interface 2 through the charging relay switch K1 of the charging circuit 11 and the second diode D2 of the discharging circuit 12 in the charging and discharging circuit 1 respectively, so that the battery is charged; at this time, the discharging relay switch K2 is turned off, and when a current flows from the battery positive interface 2 to the charging/discharging circuit 1, the current is blocked by the second diode D2, so that the current cannot flow to the load positive interface 3, thereby blocking the feedback current.
When the battery discharges, current flows in through the battery main positive interface 2, and then flows to the load positive interface 3 through the discharge relay switch K2 of the discharge circuit 12 in the charge-discharge circuit 1 and the first diode D1 of the charge circuit respectively to realize the discharge of the battery; at this time, the charging relay switch K1 is turned off, and when a current flows into the charging and discharging circuit 1 from the positive load interface 3, the current is blocked by the first diode D1, so that the current cannot flow to the positive battery interface 2, thereby blocking the feedback current.
In addition, in the embodiment, the positions of the charging circuit 11 and the discharging circuit 12 can be interchanged, and the interchanged charging and discharging circuit 1 can still realize the controlled on-off of the charging circuit and the discharging circuit, and can block the feedback current.
Specifically, a first end of a charging relay switch K1 is connected with a battery main positive interface 2, a second end of the charging relay switch K1 is connected with a first end of a discharging relay switch K2, and a second end of the discharging relay switch K2 is connected with a load positive interface 3;
or, the first end of the discharging relay switch K2 is connected with the battery positive interface 2, the second end of the discharging relay switch K2 is connected with the first end of the charging relay switch K1, and the second end of the charging relay switch is connected with the load positive interface 3.
The charge and discharge circuit 1 in fig. 3 includes a charge circuit 11 and a discharge circuit 12 connected in parallel.
The charging circuit 11 comprises a charging relay switch K1 and a third diode D3 which are connected in series;
the first end of the charging relay switch K1 is connected with the battery main positive interface 2, the second end of the charging relay switch K1 is connected with the negative electrode of a third diode D3, and the negative electrode of the third diode D3 is connected with the load positive interface 3; or the second end of the charging relay switch K1 is connected with the load positive interface 3, the first end of the charging relay switch K1 is connected with the positive electrode of the third diode D3, and the negative electrode of the third diode D3 is connected with the battery main positive interface 2;
the discharge circuit 12 includes a discharge relay switch K2 and a fourth diode D4 connected in series;
the first end of the discharging relay switch is connected with the battery main positive interface 2, the second end of the discharging relay switch K2 is connected with the anode of a fourth diode D4, and the cathode of a second diode is connected with the load positive interface 3; or the second end of the discharging relay switch K2 is connected to the positive load interface 3, the first end of the discharging relay switch K2 is connected to the negative electrode of the fourth diode D4, and the positive electrode of the fourth diode D4 is connected to the positive battery interface 2.
Wherein, the first end of charge relay switch K1 links to each other with the first end of maintaining the switch, and the second end of charge relay switch K1 links to each other with the first end of discharge relay switch K2, and the second end of discharge relay switch K2 links to each other with load positive interface 3.
It should be noted that, when charging the battery, current flows into the positive load interface 3, and then flows into the positive battery interface 2 through the charging relay switch K1 and the third diode D3 of the charging circuit 11 in the charging and discharging circuit 1, respectively, so as to charge the battery; at this time, the discharging relay switch K2 is turned off, and when a current flows into the charging and discharging circuit 1 from the battery positive interface 2, the current is blocked by the third diode D3 and the discharging relay switch K2, so that the current cannot flow to the load positive interface 3, thereby blocking the feedback current.
When the battery discharges, current flows in through the battery main positive interface 2, and then flows to the load positive interface 3 through the discharge relay switch K2 and the fourth diode D4 of the discharge circuit 12 in the charge and discharge circuit 1 respectively to realize battery discharge; at this time, the charging relay switch K1 is turned off, and when a current flows into the charging and discharging circuit 1 from the load positive interface 3, the current is blocked by the fourth diode D4 and the charging relay switch K1, so that the current cannot flow to the battery positive interface 2, thereby blocking the feedback current. The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 in this embodiment may be free-wheeling diodes. The charging relay switch K1 and the discharging relay switch K2 correspond to the relay coils, and the charging relay switch K1 and the discharging relay switch K2 are switched on and off under the control of a battery management system.
In addition, in this embodiment, the positions of the charging relay switch K1 and the third diode D3 in the charging circuit 11 may be interchanged, the positions of the discharging relay switch K2 and the fourth diode D4 in the discharging circuit 12 may also be interchanged, and the charging and discharging circuit 1 after being interchanged can still realize controlled on-off of the charging loop and the discharging loop, and can block the feedback current.
In the embodiment, the setting modes of the charging circuit 11 and the discharging circuit 12 can both control the relay switch and the corresponding diodes by utilizing the one-way conduction characteristic of the diodes, and when charging, the charging relay switch K1 is controlled to be opened, so that current flows to the battery main positive interface 2 through the charging relay switch K1 and the corresponding diode positive electrode, charging is realized, and when the current flows to the charging and discharging circuit 1 from the battery main positive electrode, the current is limited by the corresponding diodes, so that feedback current is blocked; when discharging, the discharging relay switch is controlled to be opened, so that current flows to the load positive interface 3 through the discharging relay switch K2 and the anode of the corresponding diode, discharging is achieved, and when the current flows to the charging and discharging circuit 1 from the load positive, the current is limited by the corresponding diode, and feedback current is blocked.
EXAMPLE III
Fig. 4 is an overall circuit diagram of an electrical circuit of a power distribution unit according to a third embodiment of the present invention. As shown in fig. 4, the electric circuit includes:
the system comprises a battery main positive interface 2, a manual maintenance switch MSD, a charging circuit, a discharging circuit and a load positive interface 3 which are sequentially connected in series.
The charging circuit comprises a charging relay switch K1 and a first diode D1 which are connected in parallel, the positive electrode of the first diode D1 is connected with the first end of the charging relay switch K1, and the negative electrode of the first diode D1 is connected with the second end of the charging relay switch K1.
The discharging circuit comprises a discharging relay switch K2 and a second diode D2 which are connected in parallel, the negative pole of the second diode D2 is connected with the first end of the discharging relay switch K2, and the positive pole of the second diode D2 is connected with the second end of the discharging relay switch K2.
It should be noted that, in this embodiment, a manual maintenance switch is further connected in series between the battery main positive interface 2 and the charging and discharging circuit 1, so as to ensure the safety of maintenance personnel when the battery is repaired.
When charging for the battery, the battery management system receives the charge signal of putting in order car communication port 400 transmission, control charging relay switch K1 and correspond charging relay coil K11 and go up the electricity, make charging relay switch K1 closed, thereby make the electric current that flows in from load positive interface 3 flow to battery through second diode D2 and charging relay switch K1 respectively and always positive interface 2, charge for the battery, at this moment, discharge relay switch K2 disconnection, when by the electric current from battery always positive interface 2 flow in to charge-discharge circuit 1, the electric current can be blocked by second diode D2, make the electric current can't flow to load positive interface 3, thereby block the repayment electric current.
When the battery discharges, the battery management system receives a discharge signal transmitted by the finished automobile communication port 400, and controls the discharge relay coil K22 corresponding to the discharge relay switch K2 to be electrified, so that the discharge relay switch K2 is closed, current flows in through the battery main positive interface 2, and then flows to the load positive interface 3 through the first diode D1 and the discharge relay switch K2 in sequence, and the battery discharge is realized; at this time, the charge relay switch K1 is turned off, and when a current flows into the charge and discharge circuit 1 from the load positive interface 3, the current is blocked by the first diode D1, so that the current cannot flow to the battery main positive interface 2, thereby blocking the feedback current.
In a particular embodiment, the electrical circuit further comprises: an emergency stop protection circuit;
the emergency stop protection circuit comprises a pre-charging relay coil K33, a battery management system and an emergency stop switch module 4;
a charging control interface of the battery management system is connected with one end of a charging relay coil K11, and the other end of the charging relay coil K11 is connected with a first end of the emergency stop switch module 4;
a discharge control interface of the battery management system is connected with one end of a discharge relay coil K22, and the other end of the discharge relay coil K22 is connected with a first end of the emergency stop switch module 4;
a pre-charging control interface of the battery management system is connected with one end of a pre-charging relay coil K33, and the other end of the pre-charging relay coil K33 is connected with a first end of the emergency stop switch module 4;
and the second end of the emergency stop switch module 4 is connected with a positive main control power supply interface of the battery management system.
Wherein, scram protection switch is used for when detecting that battery management system is invalid, forces the scram protection circuit at disconnection charging relay coil K11, discharging relay coil K22 and pre-charging relay coil K33 place for charging relay coil K11, discharging relay coil K22 and pre-charging relay coil K33 fall the back after the power failure, charging relay switch K1, discharging relay switch K2 and pre-charging relay switch K3 disconnection, thereby play the effect to battery protection.
Specifically, the charging control interface, the discharging control interface and the pre-charging control interface of the battery management system are respectively connected to the corresponding charging relay coil K11, the discharging relay coil K22 and the pre-charging relay coil K33, and are used for controlling the charging of the charging relay coil K11, the discharging relay coil K22 and the pre-charging relay coil K33. Charging relay coil K11, discharging relay coil K22 and pre-charging relay coil K33 parallel connection, and charging relay coil K11, discharging relay coil K22 and pre-charging relay coil K33 all link to each other with scram protection switch's first section, and scram protection switch's second end is connected battery management system's master control power supply interface to realize scram protection circuit's return circuit control.
In a specific embodiment, the device further comprises a first indicating unit connected with the charging relay coil K11 in parallel, a second indicating unit connected with the discharging relay coil K22 in parallel and a third indicating unit connected with the pre-charging relay coil K33 in parallel.
This application is through parallelly connected instruction unit with relay coil for when the relay coil is electrified, corresponding identification signal can be shown to the instruction unit that corresponds, makes the staff can be through observing identification signal, thereby the power-on condition of the relay coil that can be easier observation corresponds. The indicating unit can adopt an LED lamp and the like with an easily observed indicating unit.
In a particular embodiment, the electrical circuit further comprises: a pre-charge circuit;
the battery main positive interface 2, the pre-charging circuit and the load positive interface 3 are connected in series in sequence.
The pre-charging circuit comprises a pre-charging relay switch K3 and a pre-charging resistor which are connected in series.
It should be noted that the electrical circuit includes a battery main positive interface 2, a pre-charging circuit and a load positive interface 3 which are connected in series in sequence, and when the line includes a manual maintenance switch, the manual maintenance switch can be connected in series between the battery main positive interface 2 and the pre-charging circuit. The pre-charging circuit is used for effectively protecting a capacitor, a fuse and a direct current contactor in the circuit; the direct power-on instant charging current is prevented from being possibly too large, the capacitor is possibly damaged due to the fact that the instant current is too large, and switching devices such as a direct current contactor can be damaged.
In a specific embodiment, the electrical circuit further comprises: a low voltage supply circuit;
the low-voltage power supply circuit comprises a DC/DC converter, a key switch 5 and a low-voltage power supply port 7;
the first end of the key switch 5 is connected with the battery main positive interface 2, and the second end of the key switch 5 is connected with the positive input interface of the DC/DC converter;
and the positive output interface of the DC/DC converter is respectively connected with the positive input interface of the low-voltage power supply port 7 and the positive master control power supply interface of the battery management system, and the negative output interface of the DC/DC converter is respectively connected with the negative input interface of the low-voltage power supply port 7 and the negative master control power supply interface of the battery management system.
It should be noted that the low-voltage power supply circuit is used for providing low-voltage power supply for the entire vehicle through the low-voltage power supply interface and providing low-voltage power supply for the battery management system. Wherein, the first end of the key switch 5 is connected with the battery main positive interface 2, and the second end of the key switch 5 is connected with the positive input interface of the DC/DC converter; the positive electrode output interface of the DC/DC converter is respectively connected with the positive electrode input interface of the low-voltage power supply port 7 and the positive electrode master control power supply interface of the battery management system, the negative electrode output interface of the DC/DC converter is respectively connected with the negative electrode input interface of the low-voltage power supply port 7 and the negative electrode master control power supply interface of the battery management system, the negative electrode input interface of the DC/DC converter is connected with the first end of the shunt 10, and the second end of the shunt 10 is connected with the battery master negative interface 8.
Specifically, the key switch 5 is used for controlling the on-off of the low-voltage power supply circuit, when the key switch 5 is switched on, the DC/DC converter starts to work, and converts the direct-current voltage applied by the battery main positive interface 2 into the required direct-current low voltage, so as to respectively provide the direct-current low voltage for the battery management system and the low-voltage power supply port 7, and the low-voltage power supply port 7 is connected with the whole vehicle.
In a particular embodiment, the electrical circuit further comprises: a heating circuit;
the heating circuit comprises a battery main positive interface 2, a heating positive relay switch K5, a fuse and a heating positive interface 6 which are sequentially connected in series;
the positive electrode of the coil of the heating positive relay is connected with the positive electrode control interface of the heating positive relay of the battery management system, and the negative electrode of the coil of the heating positive relay is connected with the negative electrode control interface of the heating positive relay of the battery management system;
a fifth indicating unit is also included in parallel with the heating positive relay coil K55.
It should be noted that the heating circuit is used for heating the battery at a low temperature to ensure the performance of the battery. The heating circuit comprises a battery main positive interface 2, a heating positive relay switch K5, a fuse and a heating positive interface 6 which are sequentially connected in series. Generally, a manual maintenance switch MSD can be connected in series between the battery main positive interface 2 and the heating positive relay switch K5. The positive coil of the positive relay is connected with the positive control interface of the positive heating relay of the battery management system, the negative coil of the positive heating relay is connected with the negative control interface of the positive heating relay of the battery management system, so that the battery management system is powered on the positive heating relay through the positive control interface of the positive heating relay, the positive heating relay switch K5 is controlled to be switched on, and the positive heating relay switch K6 is controlled to normally work.
In addition, the fifth indicating unit connected with the heating positive relay coil K55 in parallel is used for displaying the corresponding identification signal when the heating positive relay coil K55 is powered on, so that the staff can observe the identification signal, and the corresponding power-on condition of the heating positive relay coil K55 can be observed more easily. The indicating unit can adopt an LED lamp and the like with an easily observed indicating unit.
In a particular embodiment, the electrical circuit further comprises: the battery master negative interface 8, the shunt 10, the master negative relay switch K4 and the load negative interface 100 are sequentially connected in series;
the heating device also comprises a heating negative relay switch K6 and a heating negative interface 9 which are connected in series;
the first end of the shunt 10 is connected with the first end of the main negative relay switch K4, the second end of the main negative relay switch K4 is respectively connected with the load negative interface 100 and the first end of the heating negative relay switch K6, and the second end of the heating negative relay switch K6 is connected with the heating negative interface 9;
a fourth indicating unit is also included in parallel with the master negative relay coil K44 and a sixth indicating unit is included in parallel with the heating negative relay coil K66.
It should be noted that the electrical circuit further includes a battery total negative interface 8, a shunt 10, a total negative relay switch K4, and a load negative interface 100, which are connected in series in sequence, and further includes a heating negative relay switch K6 and a heating negative interface 9, which are connected in series. Wherein the first end of total negative relay switch K4 is connected to the first end of shunt 10, and the first end of load burden interface 100 and heating burden relay switch K6 is connected respectively to the second end of total negative relay switch K4, and heating burden interface 9 is connected to the second end of heating burden relay switch K6. In addition, the heating negative relay coil K66 and the total negative relay coil K44 are connected with the corresponding heating negative relay control interface and the total negative relay control interface on the battery management system, so that the battery management system directly controls the electrification of the heating negative relay coil K66 and the total negative relay coil K44. When the battery is charged, the charging relay switch K1 and the total negative relay switch K4 are closed; when the battery discharges, the discharging relay switch and the total negative relay switch K4 are closed; when the battery heats up, the heating positive relay switch K5 and the heating negative relay switch K6 are closed.
In addition, total negative relay coil K44 is parallelly connected with the fourth instruction unit, and heating negative relay coil K66 is parallelly connected with the sixth instruction unit for when total negative relay coil K44 and heating negative relay coil K66 go up the electricity, corresponding identification signal can be shown to the instruction unit that corresponds, makes the staff can be through observing identification signal, thereby the power-on condition of the positive relay coil K55 of heating that can be easier the observation. The indicating unit can adopt an LED lamp and the like with an easily observed indicating unit.
This application can force the scram protection switch of disconnection through the setting, when detecting battery management system inefficacy, force disconnection charging relay coil K11, the scram protection circuit at discharging relay coil K22 and pre-charging relay coil K33 place, make charging relay coil K11, discharging relay coil K22 and pre-charging relay coil K33 fall the back that falls, charging relay switch K1, discharging relay switch K2 and pre-charging relay switch K3 disconnection, thereby play the effect to battery protection. Be used for when relay coil is electrified through setting up the indicating unit, the corresponding indicating unit can show corresponding identification signal for the staff can be through observing identification signal, thereby can be easier the power-on condition of the relay coil that the observation corresponds. The indicating unit can adopt an LED lamp and the like with an easily observed indicating unit.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electrical circuit for a power distribution unit, comprising: the battery main positive interface, the charge-discharge circuit and the load positive interface are sequentially connected in series;
the charging and discharging circuit is used for controlling the on-off of a charging loop and a discharging loop of the battery and is also used for blocking feedback current from flowing to the load positive interface from the battery total positive interface when the charging loop is controlled to be conducted; when the discharge loop is controlled to be conducted, feedback current is blocked from flowing from the load positive interface to the battery main positive interface.
2. The power distribution unit electrical circuit of claim 1, wherein the charging and discharging circuit comprises a charging circuit and a discharging circuit in series;
the charging circuit comprises a charging relay switch and a first diode which are connected in parallel, wherein the anode of the first diode is connected with the first end of the charging relay switch, and the cathode of the first diode is connected with the second end of the charging relay switch;
the discharging circuit comprises a discharging relay switch and a second diode which are connected in parallel, the negative electrode of the second diode is connected with the first end of the discharging relay switch, and the positive electrode of the second diode is connected with the second end of the discharging relay switch.
3. The power distribution unit electrical circuit of claim 2, wherein a first terminal of the charge relay switch is connected to the battery main positive interface, a second terminal of the charge relay switch is connected to a first terminal of the discharge relay switch, and a second terminal of the discharge relay switch is connected to the load positive interface;
or the first end of the discharging relay switch is connected with the positive interface of the battery, the second end of the discharging relay switch is connected with the first end of the charging relay switch, and the second end of the charging relay switch is connected with the positive interface of the load.
4. The power distribution unit electrical circuit of claim 1, wherein the charging and discharging circuit comprises a charging circuit and a discharging circuit in parallel;
the charging circuit comprises a charging relay switch and a third diode which are connected in series;
the first end of the charging relay switch is connected with the main positive interface of the battery, the second end of the charging relay switch is connected with the negative electrode of a third diode, and the negative electrode of the third diode is connected with the positive interface of the load; or the second end of the charging relay switch is connected with the positive load interface, the first end of the charging relay switch is connected with the positive pole of the third diode, and the negative pole of the third diode is connected with the total positive battery interface;
the discharging circuit comprises a discharging relay switch and a fourth diode which are connected in series;
the first end of the discharging relay switch is connected with the battery main positive interface, the second end of the discharging relay switch is connected with the anode of the fourth diode, and the cathode of the second diode is connected with the load positive interface; or the second end of the discharging relay switch is connected with the positive load interface, the first end of the discharging relay switch is connected with the negative electrode of the fourth diode, and the positive electrode of the fourth diode is connected with the total positive battery interface.
5. The power distribution unit electrical circuit of claim 1, further comprising an emergency stop protection circuit;
the emergency stop protection circuit comprises a pre-charging relay coil, a battery management system and an emergency stop switch module;
a charging control interface of the battery management system is connected with one end of a charging relay coil, and the other end of the charging relay coil is connected with a first end of the emergency stop switch module;
a discharging control interface of the battery management system is connected with one end of a discharging relay coil, and the other end of the discharging relay coil is connected with a first end of the emergency stop switch module;
a pre-charging control interface of the battery management system is connected with one end of a pre-charging relay coil, and the other end of the pre-charging relay coil is connected with a first end of the emergency stop switch module;
and the second end of the emergency stop switch module is connected with a positive master control power supply interface of the battery management system.
6. The power distribution unit electrical circuit of claim 5, further comprising a first indicating unit in parallel with the charge relay coil, a second indicating unit in parallel with the discharge relay coil, and a third indicating unit in parallel with the pre-charge relay coil.
7. The power distribution unit electrical circuit of claim 1, further comprising a pre-charge circuit;
the battery main positive interface, the pre-charging circuit and the load positive interface are sequentially connected in series;
the pre-charging circuit comprises a pre-charging relay switch and a pre-charging resistor which are connected in series.
8. The power distribution unit electrical circuit of claim 1, further comprising a low voltage supply circuit;
the low-voltage power supply circuit comprises a DC/DC converter, a key switch and a low-voltage power supply port;
the first end of the key switch is connected with the first end of the battery master positive interface, and the second end of the key switch is connected with the positive input interface of the DC/DC converter;
and the positive output interface of the DC/DC converter is respectively connected with the positive input interface of the low-voltage power supply port and the positive master control power supply interface of the battery management system, and the negative output interface of the DC/DC converter is respectively connected with the negative input interface of the low-voltage power supply port and the negative master control power supply interface of the battery management system.
9. The power distribution unit electrical circuit of claim 1, further comprising a heating circuit;
the heating circuit comprises a battery main positive interface, a heating positive relay switch, a fuse and a heating positive interface which are sequentially connected in series;
the positive electrode of the coil of the heating positive relay is connected with the positive electrode control interface of the heating positive relay of the battery management system, and the negative electrode of the coil of the heating positive relay is connected with the negative electrode control interface of the heating positive relay of the battery management system;
and the fifth indicating unit is connected with the heating positive relay coil in parallel.
10. The power distribution unit electrical circuit of claim 1, further comprising a battery master negative interface, a shunt, a master negative relay switch, and a load negative interface connected in series in that order;
the heating negative relay switch and the heating negative interface are connected in series;
the first end of the shunt is connected with the first end of the main negative relay switch, the second end of the main negative relay switch is respectively connected with the load interface and the first end of the heating negative relay switch, and the second end of the heating negative relay switch is connected with the heating negative interface;
the heating relay further comprises a fourth indicating unit connected with the total negative relay coil in parallel and a sixth indicating unit connected with the heating negative relay coil in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221072076.1U CN217778405U (en) | 2022-05-05 | 2022-05-05 | Electric loop of power distribution unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221072076.1U CN217778405U (en) | 2022-05-05 | 2022-05-05 | Electric loop of power distribution unit |
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| Publication Number | Publication Date |
|---|---|
| CN217778405U true CN217778405U (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221072076.1U Active CN217778405U (en) | 2022-05-05 | 2022-05-05 | Electric loop of power distribution unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN217778405U (en) |
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2022
- 2022-05-05 CN CN202221072076.1U patent/CN217778405U/en active Active
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