Vehicle driving source device

Abstract

To provide a vehicle driving source device which can suppress deterioration of durability of an integrated circuit and prevent breakage of the same.SOLUTION: A vehicle driving source device comprises: a battery which can supply a drive motor of a vehicle through a high voltage line with electric power; a battery monitoring part which is connected with the high voltage line, has an integrated circuit to detect inter-terminal voltage of the battery, and is driven by a low voltage power source; a battery case which accommodates both of the battery and the battery monitoring part; a vehicle ground connection part which is electrically connected to a vehicle ground; and a connection line. The integrated circuit is electrically connected through the connection line to the vehicle ground connection part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle drive source device. [Background technology]

[0002] An electric vehicle (EV) or hybrid vehicle is driven by supplying electric power stored in a battery (secondary battery) to an electric motor. The vehicle is equipped with a battery pack that supplies high-voltage power. The battery pack is equipped with a battery monitoring unit that monitors the status of each battery built in.

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

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

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-19094 [Patent Document 2] Japanese Patent Application Publication No. 2020-168910 Summary of the Invention [Problem to be solved by the invention]

[0006] FIG. 1 is a schematic wiring diagram of a vehicle drive source device according to a comparative example. The battery pack 1 includes multiple battery cells 1c connected in series. The voltage of the battery pack 1 is the sum of the number of battery cells 1c and the voltage per battery cell 1c. An integrated circuit 2 is provided for each battery cell 1c, from the front battery cell 1c to the rear battery cell 1c. The integrated circuit 2 is a voltage detection unit that detects the terminal voltage of the battery cell 1c. The integrated circuit 2 is housed in a circuit case 4 of a battery monitoring unit 3. The battery pack 1 and the battery monitoring unit 3 are housed in a battery case 5. High safety is required for the battery pack 1 installed in an EV. For example, if the parts that should be insulated are not sufficiently insulated and the insulation resistance is insufficient, the battery life may be shortened. To confirm that sufficient insulation resistance is ensured, a voltage resistance test and an insulation resistance test are performed on each of the multiple battery cells 1c. In the withstand voltage test / insulation resistance test, one terminal of the insulation resistance meter 6 is connected to the positive or negative terminal (negative terminal in Figure 1) of the last battery cell 1c via the high-voltage line HVL and high-voltage connector HVC, and the other terminal of the insulation resistance meter 6 is connected to the battery case 5 (ground), and a predetermined voltage is applied.

[0007] The integrated circuit 2 is connected to the high-voltage connector HVC via a voltage detection harness and a high-voltage line HVL inside the battery pack 1. In addition, a ground line is connected to the ground of the integrated circuit 2 from the battery case 5 via the circuit case 4. As a result, during a withstand voltage test / insulation resistance test, a high voltage that is the sum of a predetermined voltage applied to the insulation resistance meter 6 and the voltage (integrated value) of the battery pack is applied to the integrated circuit 2 arranged corresponding to the last battery cell 1c (the integrated circuit 2 arranged at the top in FIG. 1). This places a high load on the integrated circuit 2, which may shorten the durability life of the integrated circuit 2 and may damage integrated circuits 2 with low withstand voltage.

[0008] An object of the present disclosure is to provide a vehicle drive source device that can suppress a decrease in the durability life of an integrated circuit and prevent damage to the integrated circuit. [Means for solving the problem]

[0009] In order to achieve the above object, the vehicle drive source device according to the present disclosure comprises: a battery capable of supplying power to a drive motor of the vehicle via a high voltage line; a battery monitoring unit that is connected to the high voltage line, has an integrated circuit that detects a voltage between the terminals of the battery, and is driven using a low voltage power supply as a power source; a battery case that accommodates the battery and the battery monitoring unit; a vehicle ground connection portion electrically connected to a vehicle ground; A connecting line; Equipped with The integrated circuit is electrically connected to the vehicle ground connection via the connection line. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to suppress a decrease in the durability life of an integrated circuit and prevent damage to the integrated circuit. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic wiring diagram of a vehicle drive source device according to a comparative example. [Figure 2] FIG. 2 is a schematic wiring diagram of the vehicle drive source device according to the embodiment of the present disclosure. [Figure 3] FIG. 3 is a perspective view showing a ground connection structure of a vehicle drive source device according to the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 2 is a diagram illustrating a ground connection structure of a vehicle drive source device according to an embodiment of the present disclosure. Fig. 3 is a perspective view illustrating the ground connection structure of a vehicle drive source device according to an embodiment of the present disclosure. A vehicle drive source device 100 according to this embodiment includes a battery case 10, a battery pack 20, a battery monitoring unit 30, a ground harness 40, a connection line 50, and a voltage detection harness 60. Here, the connection line 50 includes a wiring pattern arranged on a circuit board, a harness, and an aluminum wire.

[0013] The battery case 10 has an internal space and includes a peripheral wall 12 arranged around the internal space, a top plate 14 arranged at an upper position in the internal space, and a bottom wall 16 arranged at a lower position in the internal space. The internal space of the battery case 10 accommodates a battery pack 20 and a battery monitoring unit 30. The battery case 10 is a housing made of metal, such as a pressed sheet metal part or an aluminum die-cast part.

[0014] 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.

[0015] 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 supply. The low-voltage connector LVC has a ground terminal GT and a low-voltage connector terminal LVCT. The ground terminal GT is connected to the vehicle ground (also called "chassis ground") via a ground harness 40.

[0016] The low-voltage connector terminal LVCT is connected to a vehicle ECU (Electronic Control Unit) via a low-voltage line LVL.

[0017] Cooling pipes are arranged 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. The predetermined capacity and predetermined output current of the battery pack 20 are set depending on the number of battery cells 22 connected in series or in parallel.

[0018] The battery monitoring unit 30 includes a circuit case 32, a printed circuit board 34, multiple integrated circuits 36, an electronic circuit 38, a transceiver circuit 39, a second low-voltage connector LVC2, and a connection line 50. The circuit case 32 accommodates the printed circuit board 34 and the multiple integrated circuits 36. The multiple integrated circuits 36 are mounted on the printed circuit board 34. The second low-voltage connector LVC2 is attached to the printed circuit board 34. The second low-voltage connector LVC2 includes 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 connected to each of the multiple integrated circuits 36 via the connection line 50. The low-voltage connector LVC and the second low-voltage connector LVC2 correspond to the "vehicle ground connection unit" of this disclosure.

[0019] 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 the low-voltage line LVL. The transceiver circuit 39 is connected to the multiple integrated circuits 36 via the low-voltage line LVL. The transceiver circuit 39 controls communication between the electronic circuit 38 and each of the multiple integrated circuits 36.

[0020] The integrated circuits 36 are arranged corresponding to the battery cells 22, respectively, and are connected by voltage detection harnesses 60 to the positive and negative terminals of the battery cells 22 arranged corresponding to the integrated circuits 36. This enables the integrated circuits 36 to detect the inter-terminal voltage of the battery cells 22. The battery monitoring unit 30 monitors the state of the battery cells 22 based on the detection results of the integrated circuits 36.

[0021] Next, we will explain the withstand voltage test / insulation resistance test. In the withstand voltage test / insulation resistance test, one terminal of the insulation resistance meter 6 (see FIG. 1) is connected to the positive or negative terminal (the negative terminal in FIG. 2) of the last battery cell 22 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 case 10 (ground), and a predetermined voltage is applied.

[0022] The integrated circuit 36 is connected to the high-voltage connector HVC via a high-voltage line HVL in the battery pack 20. The ground line is a separate system from the system connecting the battery case 10 (ground) to the ground of the integrated circuit 36, and is connected from the vehicle ground (chassis ground) to the ground of the integrated circuit 36. Specifically, the ground line is connected to the ground of the integrated circuit 36 via the vehicle ground (chassis ground), the ground harness 40, the low-voltage connector LVC, the second low-voltage connector LVC2, and the connection line 50. As a result, the ground connection line connected to the integrated circuit 36 is separated from the ground of the battery case 10, so that no voltage is applied to the integrated circuit 36 during a withstand voltage test / insulation resistance test, and therefore no high load is applied to the integrated circuit 36. This makes it possible to suppress a decrease in the durability life of the integrated circuit 36 and to prevent damage to an integrated circuit 36 with a low withstand voltage.

[0023] The vehicle drive source device 100 in the above embodiment includes a battery (battery pack 20) capable of supplying power to the vehicle's drive motor via a high-voltage line, a battery monitoring unit 30 connected to the high-voltage line and having an integrated circuit 36 that detects the voltage between the battery's terminals and driven by a low-voltage power supply, a battery case 10 that accommodates the battery and the battery monitoring unit 30, a vehicle ground connection unit (low-voltage connector LVC, second low-voltage connector LVC2) electrically connected to the vehicle ground (chassis ground), and a connection line 50, and the integrated circuit 36 is electrically connected to the vehicle ground connection unit via the connection line 50. Furthermore, the vehicle ground connection unit is electrically connected to the vehicle ground via a ground harness 40.

[0024] With the above configuration, when a predetermined voltage is applied during a withstand voltage test / insulation resistance test by connecting one terminal of the insulation resistance meter 6 to the positive or negative terminal of the rearmost battery cell 22 and connecting the other terminal of the insulation resistance meter 6 to the battery case 10 (ground), the ground line is connected from the vehicle ground (chassis ground) to the integrated circuit 36 via the ground harness 40 and connection line 50 in a separate system different from the system connecting the battery case 10 (ground) to the ground of the integrated circuit 36. Therefore, during the withstand voltage test / insulation resistance test, the line connecting the ground harness 40 and connection line 50 and the ground harness 40 connected to the battery case 10 are not connected at the time of the test. This prevents high voltage from being applied to the integrated circuit 36 via the ground harness 40 and connection line 50, thereby minimizing the reduction in the durability life of the integrated circuit 36. This also prevents damage to the integrated circuit 36 with a low withstand voltage. Furthermore, since withstand voltage tests and the like can be performed during assembly of the vehicle drive source device 100, it is possible to detect withstand voltage defects due to assembly errors that occur during assembly. Furthermore, since it is not necessary to increase the dielectric strength voltage of the integrated circuit 36 by increasing the distance between the wires, it is possible to prevent the device from becoming larger and the cost from increasing.

[0025] Furthermore, in the vehicle drive source device 100 according to the above embodiment, the vehicle ground connection portion includes a low-voltage connector LVC having a ground terminal GT electrically connected to the vehicle ground, and the integrated circuit 36 is electrically connected to the ground terminal GT via the connection line 50. Thus, by connecting to the ground terminal GT via the connection line 50, the ground line is connected from the vehicle ground (chassis ground) to the integrated circuit 36, thereby improving the ease of assembly.

[0026] In the vehicle drive source device 100 according to the above embodiment, the low-voltage connector LVC is electrically connected to the low-voltage power supply. By providing the ground terminal GT to the low-voltage connector LVC electrically connected to the low-voltage power supply, it is possible to reduce the number of parts.

[0027] Furthermore, in the vehicle drive source device 100 according to the above embodiment, the low-voltage connector LVC is disposed on the outside of the battery case 10. This allows access to the low-voltage connector LVC from the outside of the battery case 10, thereby further improving the ease of assembly.

[0028] Furthermore, in the vehicle driving source device 100 according to the above embodiment, the battery monitoring unit 30 includes a second low-voltage connector LVC2 having a second ground terminal GT2, the integrated circuit 36 is electrically connected to the second ground terminal GT2 via the connection line 50, and the second ground terminal GT2 is electrically connected to the ground terminal GT via the second low-voltage line. As a result, by connecting to the second ground terminal GT2 via the connection line 50, the ground line is connected from the vehicle ground (chassis ground) to the integrated circuit 36, thereby improving the ease of assembly.

[0029] In the above embodiment, a vehicle ground connection section using connectors (low-voltage connector LVC and second low-voltage connector LVC2) is shown, but the present disclosure is not limited to this, and may be, for example, a vehicle ground connection section that does not use a connector and connects the integrated circuit 36 and the vehicle ground with a harness.

[0030] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these embodiments. In other words, the present disclosure can be carried out in various forms without departing from its gist or main features. [Industrial Applicability]

[0031] The present disclosure is suitably used in vehicles equipped with a vehicle drive source device that is required to suppress a decrease in the durability life of an integrated circuit and to prevent damage to the integrated circuit. [Explanation of symbols]

[0032] GL Grand Line GT Ground terminal GT2 Second ground terminal HVC High Voltage Connectors HVL High Voltage Line LVC Low Voltage Connector LVC2 Secondary Low Voltage Connector LVL Low Voltage Line LVL2 Second low voltage line 1 Battery pack 1c battery cell 2. Integrated Circuits 3 Battery monitoring unit 4 Circuit Case 5 Battery case 6. Insulation resistance tester 10 Battery case 12 Peripheral wall 14 Top plate 16 Bottom wall 20 Battery pack 22 battery cells 30 Battery monitoring unit 32 Circuit Case 34 Printed Circuit Board 36 Integrated Circuits 38 Electronic circuit 39 Transceiver Circuit 40 Ground harness 50 connection lines 60 Voltage detection harness

Claims

1. a battery capable of supplying power to a drive motor of the vehicle via a high voltage line; a battery monitoring unit that is connected to the high voltage line, has an integrated circuit that detects a voltage between the terminals of the battery, and is driven using a low voltage power supply as a power source; a battery case that accommodates the battery and the battery monitoring unit; a vehicle ground connection portion electrically connected to a vehicle ground; A connecting line; Equipped with the integrated circuit is electrically connected to the vehicle ground connection via the connection line; Vehicle drive source device.

2. the vehicle ground connection portion includes a low voltage connector having a ground terminal electrically connected to the vehicle ground; the integrated circuit is electrically connected to the ground terminal via the connection line; 2. The vehicle drive source device according to claim 1.

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

4. The low-voltage connector is disposed outside the battery case.

4. The vehicle drive source device according to claim 3.

5. the battery monitor unit includes 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; 3. The vehicle drive source device according to claim 2.

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