Vehicle drive source device

Abstract

This vehicle drive source device is provided with: a battery capable of supplying power to a drive motor of a vehicle via a high-voltage line; a battery monitoring unit having an integrated circuit connected to the high-voltage line and detecting a voltage between terminals of the battery, the battery monitoring unit being driven by using a low-voltage power source as a power source; a battery box accommodating the battery and the battery monitoring unit; the vehicle grounding connection part is electrically connected with vehicle grounding; and a connection line via which the integrated circuit is electrically connected with the vehicle ground connection portion. The driving source device for the vehicle can restrain reduction of endurance life of an integrated circuit and prevent damage of the integrated circuit.

Description

Technical Field

[0001] The present invention relates to a vehicle drive source device. Background Art

[0002] Electric vehicles (EVs) and hybrid vehicles (HEVs) use electricity stored in batteries (secondary batteries) to supply power to the electric motor, driving the vehicle. The vehicle is equipped with a battery pack that supplies high-voltage power. The battery pack also includes a battery monitoring unit that monitors the status of each battery within.

[0003] For example, Patent Document 1 discloses a vehicle control unit comprising: a control unit connectable to at least a first power line of the vehicle; one or more loads connectable downstream of the control unit; a removable internal rechargeable battery; and a housing capable of housing the control unit and the internal rechargeable battery. The control unit selectively supplies either a first power source supplied from the first power line or a second power source supplied from the internal rechargeable battery to the load, depending on the situation. Furthermore, the control unit is connected to ground via a connector, and the battery is also connected to ground.

[0004] For example, in Patent Document 2, a control device is connected to a power line and a ground line via a connector, and the power line and the ground line are connected to a battery.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-19094

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-168910 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] Figure 1It is a schematic wiring diagram of a vehicle drive source device of a comparative example. The battery pack 1 has a plurality of battery cells 1c connected in series. The voltage of the battery pack 1 is the total value obtained by multiplying the voltage of each battery cell 1c by the number of battery cells 1c. Integrated circuits 2 are arranged corresponding to each of the battery cells 1c from the frontmost battery cell 1c to the last battery cell 1c. The integrated circuit 2 is a voltage detection unit that detects the voltage between the terminals of the battery cell 1c. The integrated circuit 2 is housed in the circuit box 4 of the battery monitoring unit 3. The battery pack 1 and the battery monitoring unit 3 are housed in the battery box 5. For the battery pack 1 mounted on an EV, high safety is required. For example, if the parts that should be insulated are not sufficiently insulated and the insulation resistance is insufficient, the battery life may be reduced. In order to confirm that sufficient insulation resistance can be ensured, a withstand voltage check / insulation resistance check is performed on each of the plurality of battery cells 1c. In the withstand voltage check / insulation resistance check, one terminal of the insulation resistance meter 6 is connected to the positive terminal or negative terminal ( Figure 1 in this case, the negative terminal) of the last battery cell 1c via the high voltage line HVL and the high voltage connector HVC, and the other terminal of the insulation resistance meter 6 is connected to the battery box 5 (ground), and a prescribed voltage is applied.

[0011] The integrated circuit 2 is connected to the high voltage connector HVC via the voltage detection wire harness in the battery pack 1 and the high voltage line HVL. In addition, the ground wire is connected from the battery box 5 to the ground of the integrated circuit 2 via the circuit box 4. Therefore, in the withstand voltage check / insulation resistance check, the integrated circuit 2 arranged corresponding to the last battery cell 1c (the integrated circuit 2 arranged at the top in Figure 1 this case) is applied with a high voltage obtained by adding the prescribed voltage applied to the insulation resistance meter 6 and the voltage of the battery pack (total value). Thus, since a high load is applied to the integrated circuit 2, the durable life of the integrated circuit 2 is reduced, and in addition, the integrated circuit 2 with low withstand voltage may be damaged.

[0012] An object of the present disclosure is to provide a vehicle drive source device that can suppress a reduction in the durable life of an integrated circuit and prevent breakage of the integrated circuit.

[0013] Solution to the problem

[0014] In order to achieve the above object, the vehicle drive source device of the present disclosure includes:

[0015] A battery that can supply power to a drive motor of a vehicle via a high voltage line;

[0016] A battery monitoring unit having an integrated circuit connected to the high voltage line and detecting the voltage between the terminals of the battery, and being driven by a low voltage power supply;

[0017] A battery box that houses the battery and the battery monitoring unit;

[0018] A vehicle ground connection part that is electrically connected to the vehicle ground; and

[0019] A connection line,

[0020] The integrated circuit is electrically connected to the vehicle ground connection part via the connection line.

[0021] Advantages of the Invention

[0022] According to the present disclosure, it is possible to suppress a reduction in the durability life of the integrated circuit and prevent breakage of the integrated circuit. Description of the Drawings

[0023] Figure 1 is a schematic wiring diagram of a vehicle drive source device of a comparative example.

[0024] Figure 2 is a schematic wiring diagram of a vehicle drive source device according to an embodiment of the present disclosure.

[0025] Figure 3 is a perspective view showing a ground connection structure of a vehicle drive source device according to an embodiment of the present disclosure.

[0026] Description of Reference Numerals

[0027] GL Ground wire

[0028] GT Ground terminal

[0029] GT2 Second ground terminal

[0030] HVC High-voltage connector

[0031] HVL High-voltage line

[0032] LVC Low-voltage connector

[0033] LVC2 Second low-voltage connector

[0034] LVL Low-voltage line

[0035] LVL2 Second low-voltage line

[0036] 1 Battery pack

[0037] 1c Battery cell

[0038] 2 Integrated circuit

[0039] 3 Battery monitoring unit

[0040] 4 Circuit box

[0041] 5 Battery box

[0042] 6 Insulation resistance meter

[0043] 10 Battery box

[0044] 12 Peripheral wall

[0045] 14 Top plate

[0046] 16 Bottom wall

[0047] 20 Battery pack

[0048] 22 Battery cell

[0049] 30 Battery monitoring unit

[0050] 32 Circuit box

[0051] 34 Printed circuit board

[0052] 36 Integrated circuit

[0053] 38 Electronic circuit

[0054] 39 Transceiver circuit

[0055] 40 Grounding harness

[0056] 50 Connection wire

[0057] 60 Voltage detection harness Detailed implementation manners

[0058] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figure 2 It is a schematic wiring diagram of the vehicle drive source device according to the embodiment of the present disclosure. Figure 3 It is a perspective view showing the grounding connection structure of the vehicle drive source device according to the embodiment of the present disclosure. The vehicle drive source device 100 in this embodiment includes a battery box 10, a battery pack 20, a battery monitoring unit 30, a grounding harness 40, a connection wire 50, and a voltage detection harness 60. Here, the connection wire 50 includes a wiring pattern, a harness, and an aluminum wire disposed on a substrate.

[0059] The battery box 10 has an internal space, and has a peripheral wall 12 disposed around the internal space, a top plate 14 disposed at an upper position in the internal space, and a bottom wall 16 disposed at a lower position in the internal space. In the internal space of the battery box 10, a battery pack 20 and a battery monitoring unit 30 are accommodated. The battery box 10 is, for example, a metal housing such as a sheet metal stamping part or an aluminum die-cast part.

[0060] A high-voltage connector HVC is disposed on the peripheral wall 12. The high-voltage connector HVC has a positive terminal and a negative terminal. The positive terminal of the battery pack 20 is connected to the positive terminal of the inverter via the high-voltage line HVL and the positive terminal of the high-voltage connector HVC. The negative terminal of the battery pack 20 is connected to the negative terminal of the inverter via the high-voltage line HVL and the negative terminal of the high-voltage connector HVC.

[0061] A low-voltage connector LVC is disposed on the peripheral wall 12. The low-voltage connector LVC is electrically connected to a low-voltage power source. The low-voltage connector LVC has a ground terminal GT and a low-voltage connector terminal LVCT. The ground terminal GT is connected to vehicle ground (also referred to as "chassis ground") via a ground harness 40.

[0062] The low-voltage connector terminal LVCT is connected to a vehicle ECU (Electronic Control Unit) via a low-voltage line LVL.

[0063] A cooling pipe is disposed along the peripheral wall of the battery pack 20. The battery pack 20 has a plurality of battery cells 22. The plurality of battery cells 22 are connected in series or in parallel. By adjusting the number of battery cells 22 connected in series or in parallel, the rated capacity and the rated output current of the battery pack 20 are set.

[0064] The battery monitoring unit 30 has a circuit box 32, a printed circuit board 34, a plurality of integrated circuits 36, an electronic circuit 38, a transceiver circuit 39, a second low-voltage connector LVC2, and a connection wire 50. The printed circuit board 34 and the plurality of integrated circuits 36 are accommodated in the circuit box 32. The plurality of integrated circuits 36 are mounted on the printed circuit board 34. The second low-voltage connector LVC2 is mounted on the printed circuit board 34. The second low-voltage connector LVC2 has a second ground terminal GT2 and a second low-voltage connector terminal LVCT2. The second ground terminal GT2 is connected to the ground terminal GT of the low-voltage connector LVC via a low-voltage line LVL. The second ground terminal GT2 is respectively connected to the plurality of integrated circuits 36 via a connection wire 50. In addition, the low-voltage connector LVC and the second low-voltage connector LVC2 correspond to the "vehicle ground connection portion" of the present disclosure.

[0065] The second low-voltage connector terminal LVCT2 is connected to the low-voltage connector terminal LVCT via a low-voltage line LVL. The electronic circuit 38 has an arithmetic circuit, a control circuit, and a communication circuit. The electronic circuit 38 is connected to the second low-voltage connector terminal LVCT2 via a low-voltage line LVL. The transceiver circuit 39 is connected to the plurality of integrated circuits 36 via a low-voltage line LVL. The transceiver circuit 39 controls the communication between each of the plurality of integrated circuits 36 and the electronic circuit 38.

[0066] A plurality of integrated circuits 36 are respectively arranged corresponding to a plurality of battery cells 22, and are respectively connected to the positive terminal and the negative terminal of the battery cell 22 arranged corresponding to the integrated circuit 36 through a voltage detection wire harness 60. Thus, the integrated circuit 36 can detect the voltage between the terminals of the battery cell 22. The battery monitoring unit 30 monitors the state of the battery cell 22 based on the detection result of the integrated circuit 36.

[0067] Next, the withstand voltage inspection / insulation resistance inspection will be described. In the withstand voltage inspection / insulation resistance inspection, one terminal of an insulation resistance meter 6 (see Figure 1 ) is connected to the positive terminal or the negative terminal of the last battery cell 22 (the negative terminal in Figure 2 ) via a high voltage wire HVL and a high voltage connector HVC, and the other terminal of the insulation resistance meter 6 is connected to the battery box 10 (grounded), and a prescribed voltage is applied.

[0068] The integrated circuit 36 is connected to the high voltage connector HVC via the high voltage wire HVL in the battery pack 20. In addition, the ground wire is connected to the ground of the integrated circuit 36 from the vehicle ground (chassis ground) through a system different from the system that connects from the battery box 10 (grounded) to the ground of the integrated circuit 36. Specifically, the ground wire is connected to the ground of the integrated circuit 2 via the vehicle ground (chassis ground), a ground wire harness 40, a low voltage connector LVC, a second low voltage connector LVC2, and a connection wire 50. Thus, since the wire for connecting to the ground of the integrated circuit 36 is separated from the ground of the battery box 10, the integrated circuit 36 is not applied with voltage during the withstand voltage inspection / insulation resistance inspection, and no high load is applied to the integrated circuit 36. Therefore, a reduction in the durability life of the integrated circuit 36 can be suppressed, and in addition, breakage of the integrated circuit 36 with low withstand voltage can be prevented.

[0069] The vehicle drive source device 100 of the above-described embodiment includes: a battery (battery pack 20) that can supply power to a drive motor of the vehicle via a high voltage wire; a battery monitoring unit 30 that has an integrated circuit 36 connected to the high voltage wire and detects the voltage between the terminals of the battery, and is driven by a low voltage power supply; a battery box 10 that houses the battery and the battery monitoring unit 30; a vehicle ground connection part (low voltage connector LVC, second low voltage connector LVC2) that is electrically connected to the vehicle ground (chassis ground); and a connection wire 50 through which the integrated circuit 36 is electrically connected to the vehicle ground connection part. In addition, the vehicle ground connection part is electrically connected to the vehicle ground via a ground wire harness 40.

[0070] According to the above structure, in the withstand voltage inspection / insulation resistance inspection, one terminal of the insulation resistance meter 6 is connected to the positive terminal or negative terminal of the last battery cell 22, and the other terminal of the insulation resistance meter 6 is connected to the battery box 10 (grounded), and a prescribed voltage is applied. In this case, the ground wire is connected to the integrated circuit 36 from the vehicle ground (chassis ground) via the ground wire harness 40 and the connection wire 50 through a system different from the system that is grounded from the battery box 10 (grounded) to the integrated circuit 36. Therefore, in the withstand voltage inspection / insulation resistance inspection, at the time of inspection, the wire leading to the ground wire harness 40 and the connection wire 50 is not connected to the ground wire harness 40 leading to the battery box 10, and a high voltage is not applied to the integrated circuit 36 via the ground wire harness 40 and the connection wire 50. Therefore, a reduction in the durability life of the integrated circuit 36 can be suppressed. In addition, breakage of the integrated circuit 36 with low withstand voltage can be prevented. In addition, the withstand voltage inspection and the like can be performed during the assembly process of the vehicle drive source device 100, so that withstand voltage defects caused by assembly defects occurring during assembly can be detected. In addition, since it is not necessary to increase the insulation withstand voltage of the integrated circuit 36 by increasing the distance between wirings, enlargement of the device and an increase in cost can be suppressed.

[0071] In addition, in the vehicle drive source device 100 of the above-described embodiment, the vehicle ground connection portion includes a low voltage connector LVC. The low voltage connector LVC has a ground terminal GT that is electrically connected to the vehicle ground. The integrated circuit 36 is electrically connected to the ground terminal GT via the connection wire 50. In this way, by connecting to the ground terminal GT via the connection wire 50, the ground wire is connected from the vehicle ground (chassis ground) to the integrated circuit 36, so that the assembly workability can be improved.

[0072] In addition, in the vehicle drive source device 100 of the above-described embodiment, the low voltage connector LVC is electrically connected to a low voltage power source. In this way, by providing the ground terminal GT on the low voltage connector LVC that is electrically connected to the low voltage power source, the number of components can be reduced.

[0073] In addition, in the vehicle drive source device 100 of the above-described embodiment, the low voltage connector LVC is disposed outside the battery box 10. Thereby, it is possible to access the low voltage connector LVC from the outside of the battery box 10, so that the assembly workability can be further improved.

[0074] Furthermore, in the vehicle drive source device 100 of the above-described embodiment, the battery monitoring unit 30 includes a second low-voltage connector LVC2, which has a second ground terminal GT2. The integrated circuit 36 is electrically connected to the second ground terminal GT2 via a connecting wire 50, and the second ground terminal GT2 is electrically connected to the ground terminal GT via a second low-voltage wire. Thus, by connecting to the second ground terminal GT2 via the connecting wire 50, the ground wire is connected from the vehicle ground (chassis ground) to the integrated circuit 36, thereby improving assembly workability.

[0075] In addition, in the above embodiment, a vehicle ground connection portion using connectors (a low-voltage connector LVC and a second low-voltage connector LVC2) is shown, but the present disclosure is not limited to this. For example, a vehicle ground connection portion that does not use the following connector may also be used, which is a connector that connects the integrated circuit 36 and the vehicle ground via a wiring harness.

[0076] The above-mentioned embodiments are merely examples of specific implementations of the present disclosure, and the technical scope of the present disclosure should not be limited by these embodiments. That is, the present disclosure can be implemented in various forms without departing from the gist or main features thereof.

[0077] Industrial Applicability

[0078] The present disclosure is suitable for use in a vehicle equipped with a vehicle drive source device that is required to suppress reduction in the durability life of an integrated circuit and prevent damage to the integrated circuit.

Claims

1. A drive source device for a vehicle, characterized in that, Comprising: A battery capable of supplying electric power to a drive motor of a vehicle via a high-voltage line; A battery monitoring unit having an integrated circuit connected to the high-voltage line and detecting the voltage between terminals of the battery, and being driven by a low-voltage power supply; A battery box accommodating the battery and the battery monitoring unit; A vehicle ground connection part electrically connected to vehicle ground; And A connection line, The integrated circuit is electrically connected to the vehicle ground connection part via the connection line.

2. The vehicle drive source device according to claim 1, wherein The vehicle ground connection part has a low-voltage connector having a ground terminal electrically connected to vehicle ground, The integrated circuit is electrically connected to the ground terminal via the connection line.

3. The vehicle drive source device according to claim 2, wherein The low-voltage connector is electrically connected to the low-voltage power supply.

4. The vehicle drive source device according to claim 3, wherein The low-voltage connector is disposed outside the battery box.

5. The vehicle drive source device according to claim 2, wherein The battery monitoring unit has a second low-voltage connector having a second ground terminal, The integrated circuit is electrically connected to the second ground terminal via the connection line, The second ground terminal is electrically connected to the ground terminal via a second low-voltage line.

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