Power supply system

Abstract

To provide a power supply system configured by connecting in parallel to a plurality of battery modules provided on electric motor vehicles for starting up more appropriately.SOLUTION: A system switch is installed between a stabilized power supply and a parallel connection point of power lines, and a plurality of module switches are installed between the parallel connection point and each battery control device. When the system is started, the system switch is turned on, the plurality of module switches are then turned on, and then the plurality of battery modules are started.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a power supply system, and more particularly to a power supply system configured by connecting a plurality of vehicle-mounted battery modules in parallel. [Background technology]

[0002] A power supply system of this type has been proposed in the past, which includes a first power supply connected to a load via a first switch, a second power supply connected to the load via a second switch, and a third power supply connected to the load via a third switch and having a lower internal resistance than the second power supply. In this system, when the output voltage of the first power supply becomes lower than the first voltage, the first switch is turned off and the second and third switches are turned on. Then, the third switch is turned off when a predetermined connection period has elapsed. This stabilizes the voltage supplied to the load by switching from multiple power sources. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-175148 A Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of efficient resource utilization, it is considered that battery modules installed in electric vehicles are used in a power supply system in which multiple battery modules are connected in parallel. In this case, when starting up the system, it is necessary to supply power from a stabilized power supply to a control device that starts up each battery module. However, if each battery module tries to start up at the same time, the output voltage of the stabilized power supply may drop and the system may not be able to start up.

[0005] The main object of the power supply system disclosed herein is to more appropriately start up a power supply system configured by connecting multiple battery modules in parallel and mounted on an electric vehicle. [Means for solving the problem]

[0006] The power supply system of the present disclosure employs the following measures to achieve the above-mentioned main object.

[0007] The power supply system of the present disclosure comprises: A power supply system configured by connecting in parallel a plurality of vehicle-mounted battery modules each having a battery and a battery control device that manages the battery, The battery control devices of the plurality of battery modules are connected in parallel to a stabilized power supply by a power supply line, a system switch attached between the stabilized power supply and the parallel connection point of the power supply line; a plurality of module switches attached between the parallel connection points of the power supply lines and each battery control device; a system control device that receives power from the stabilized power supply and controls the system; Equipped with The system control device includes: At the time of system startup, the system switch is turned on, and then the plurality of module switches are turned on in sequence to start up the plurality of battery modules in sequence. It is characterized by:

[0008] In the power supply system of the present disclosure, each battery control device of a plurality of battery modules is connected in parallel to a stabilized power supply by a power supply line, a system switch is attached between the stabilized power supply and a parallel connection point of the power supply line, and a plurality of module switches are attached between the parallel connection point of the power supply line and each battery control device. Then, when starting up the system, the system switch is turned on, and then the plurality of module switches are turned on in sequence to start up the plurality of battery modules in sequence. That is, the process of turning on the module switch and starting up the battery control devices connected to the module switches to start up the battery modules is repeated in sequence. In this way, since the battery modules are started up in sequence, it is possible to suppress a drop in output voltage from the stabilized power supply that may occur when starting up the battery control devices of the battery modules at the same time, and it is possible to start up the system more appropriately. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing an outline of the configuration of a power supply system 20 according to an embodiment of the present disclosure. [Diagram 2] 13 is a flowchart illustrating an example of a system startup process. [Diagram 3] FIG. 2 is an explanatory diagram showing an example of the change over time in voltage of a stabilized power supply at the time of system startup of the power supply system 20 of the embodiment and a power supply system of the comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, a mode (embodiment) for carrying out the present disclosure will be described. Fig. 1 is a configuration diagram showing an outline of the configuration of a power supply system 20 according to an embodiment of the present disclosure. The power supply system 20 is configured by connecting multiple battery modules 30a-30n in parallel, and includes a system electronic control unit (hereinafter referred to as a system ECU) 22, a stabilized power supply 51, a system switch 53, and multiple module switches 56a-56n in addition to the multiple battery modules 30a-30n.

[0011] The battery module 30a is configured as an on-board module that supplies power to a drive motor of an electric vehicle, and is incorporated into the power supply system 20 for reuse after being mounted on the electric vehicle. The battery module 30a has a battery 32a, a power control unit (hereinafter referred to as PCU) 34a, a module electronic control unit (hereinafter referred to as module ECU) 36a, and a battery electronic control unit (hereinafter referred to as battery ECU) 38a. The battery modules 30b to 30n have the same configuration as the battery module 30a.

[0012] The battery 32a is configured as, for example, a lithium-ion secondary battery. The PCU 34a is configured with an inverter that drives the driving motor, a boost converter that boosts the power from the battery and supplies it to the inverter, and the like. The battery ECU 38a inputs detection values ​​from a current sensor and a voltage sensor (not shown) attached to the output terminal of the battery 32a in order to manage the battery 32a, and calculates the charge ratio SOC of the battery 32a and the like. When the battery module 30a is mounted on the vehicle, the module ECU 36a functions as a motor electronic control unit that controls the drive of the driving motor by controlling the boost converter and the inverter in the PCU 34a, and when the battery module 30a is incorporated in the power supply system 20, it functions as a control device that starts up the battery module 30a.

[0013] The batteries 32a to 32n are connected to an output power line 44 by module power lines 42a to 42n via the PCUs 34a to 34n. The output power line 44 is an output power line of the power supply system 20.

[0014] The stabilized power supply 51 is connected to an external power supply (e.g., a 200V commercial power supply) by a power supply line 50, and is configured as a power supply circuit that supplies a predetermined stable voltage (e.g., 5V) using a transformer, a capacitor, etc. The stabilized power supply 51 is connected to a parallel connection power supply line 54 by a power supply line 52. A system switch 53 is attached to the power supply line 52. The parallel connection power supply line 54 is connected to the module ECUs 36a-36n by module power supply lines 55a-55n. Module switches 56a-56n are attached to the module power supply lines 55a-55n, respectively. Therefore, by turning on the system switch 53 and turning on each of the module switches 56a-56n, the predetermined voltage from the stabilized power supply 51 can be supplied to each of the module ECUs 36a-36n.

[0015] The system ECU 22 receives power from a stabilized power supply 51 via a power supply line 52, and controls the power supply system 20. The system ECU 22, for example, turns on and off a system switch 53 and each of the module switches 56a to 56n.

[0016] Next, the operation of the power supply system 20 of the embodiment configured as described above, particularly the operation at the time of system startup, will be described. Fig. 2 is a flowchart showing an example of a system startup process executed at the time of system startup of the power supply system 20.

[0017] In the system startup process, first, the stabilized power supply 51 is turned on (step S100), and the system ECU 22 is started up (step S110). Next, the system switch 53 is turned on (step S120), and the battery modules 30a to 30n are started up in sequence (steps S130 to S150), completing the system startup (step S160), and terminating the system startup process.

[0018] To start up the battery modules 30a-30n, first, among the battery modules 30a-30n arranged in order, the module switch 56a connected to the first battery module 30a is turned on (step S130), and the module ECU 36a is started up (step S140). Then, it is determined whether there is a battery module that has not yet been started up (step S150), and if it is determined that there is a battery module that has not yet been started up, the process returns to the process of turning on the module switch connected to the next battery module in step S130. By repeating these steps S130-S150, the battery modules 30a-30n are started up in sequence.

[0019] FIG. 3 is an explanatory diagram showing an example of a time change in the voltage of the stabilized power supply at the time of system startup of the power supply system 20 of the embodiment and the power supply system of the comparative example. As the comparative example, the system switch 53 and the module switches 56a to 56n are simultaneously turned on at the time of system startup in the hardware configuration of the power supply system 20 of the embodiment. In the figure, the voltage Vref is a minimum voltage required to start the module ECUs 36a to 36n. In the comparative example, when the system startup starts at time T1, the system switch 53 and the module switches 56a to 56n are simultaneously turned on. For this reason, the voltage from the stabilized power supply 51 drops significantly and falls below the minimum voltage Vref required to start the module ECUs 36a to 36n, resulting in a failure in system startup. On the other hand, in the embodiment, when the system startup starts at time T1, the system switch 53 is turned on, and then the module switches 56a to 56n are sequentially turned on. For this reason, although a slight voltage drop is observed from the stabilized power supply 51 when the switch is turned on, the voltage does not fall below the minimum voltage Vref required to start up the module ECUs 36a to 36n, and the system starts up normally.

[0020] In the power supply system 20 according to the embodiment described above, the batteries 32a-32n of the multiple reusable battery modules 30a-30n are connected in parallel to the output power line 44 by the module power lines 42a-42n, and the module ECUs 36a-36n of the battery modules 30a-30n are connected in parallel to a power supply line 52 connected to a stabilized power supply 51 using the module power supply lines 55a-55n and the parallel connection power supply line 54. A system switch 53 is attached to the power supply line 52, and module switches 56a-56n are attached to each of the module power supply lines 55a-55n. When the system is started, the system switch 53 is turned on, and then the module switches 56a-56n are turned on in sequence to start up the module ECUs 36a-36n in sequence. Since the battery modules 30a to 30n are started up in sequence in this manner, it is possible to suppress a significant drop in output voltage from the stabilized power supply 51 that may occur when the battery modules 30a to 30n are started up simultaneously, and the power supply system 20 can be started up more appropriately.

[0021] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on Means for Solving the Problems will be described below. In the embodiment, the batteries 32a-32n correspond to the "batteries", the battery modules 30a-30n correspond to the "battery modules", the stabilized power supply 51 corresponds to the "stabilized power supply", the system switch 53 corresponds to the "system switch", the parallel connection power supply line 54 corresponds to the "parallel connection point", the module ECUs 36a-36n correspond to the "battery control device", the module switches 56a-56n correspond to the "module switches", and the system ECU 22 corresponds to the "system control device".

[0022] Note that the correspondence between the main elements of the embodiment and the main elements of the invention described in the Means for Solving the Problem column does not limit the elements of the invention described in the Means for Solving the Problem column, since the embodiment is an example for specifically explaining the form for implementing the invention described in the Means for Solving the Problem column. In other words, the interpretation of the invention described in the Means for Solving the Problem column should be made based on the description in that column, and the embodiment is merely a specific example of the invention described in the Means for Solving the Problem column.

[0023] The present disclosure has been described above using embodiments, but the present disclosure is not limited to these embodiments in any way, and it goes without saying that the present disclosure can be embodied in various forms without departing from the gist of the present disclosure. [Industrial Applicability]

[0024] The present disclosure is applicable to the power supply system manufacturing industry and the like. [Explanation of symbols]

[0025] 20 power supply system, 22 system electronic control unit (system ECU), 30a to 30n battery module, 32a to 32n battery, 34a to 34n power control unit (PCU), 36a to 36n module electronic control unit (module ECU), 42a to 42n module power line, 44 output power line, 50 power line, 51 stabilized power supply, 52 power line, 53 system switch, 54 parallel connection power line, 55a to 55n module power line, 56a to 56n module switch.

Claims

[Claim 1] A power supply system configured by connecting in parallel a plurality of vehicle-mounted battery modules each having a battery and a battery control device that manages the battery, The battery control devices of the plurality of battery modules are connected in parallel to a stabilized power supply by a power supply line, a system switch attached between the stabilized power supply and the parallel connection point of the power supply line; a plurality of module switches attached between the parallel connection points of the power supply lines and each battery control device; a system control device that receives power from the stabilized power supply and controls the system; Equipped with The system control device includes: At the time of system startup, the system switch is turned on, and then the plurality of module switches are turned on in sequence to start up the plurality of battery modules in sequence. A power supply system comprising:

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