Vehicle connection circuit and vehicle battery structure

Abstract

In vehicles with multiple batteries, each of the multiple short-circuit modes is addressed with the minimum necessary fuses. [Solution] The junction block 20 is interposed between the first battery 11 and the second battery 12 and the motor 40, electrically connecting the first battery 11, the second battery 12, and the motor 40. The junction block 20 includes a first path 51 that charges only the first battery 11, a second path 52 that charges only the second battery 12, and a third path 53 that charges both the first battery 11 and the second battery 12. The first path 51 has a first fuse 23 located on a path that does not overlap with the second path 52 and the third path 53. The second path 52 has a second fuse 28 located on a path that does not overlap with the first path 51 and the third path 53. The third fuse 30 is located on a path that overlaps with all three paths: the first path 51, the second path 52, and the third path 53.

Description

Technical Field

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[0001] The present disclosure relates to a vehicle connection circuit and a vehicle battery structure.

Background Art

[0002] Patent Document 1 describes a battery pack capable of interrupting a large current via a fuse even when a short circuit occurs during a vehicle collision.

Prior Art Documents

[0007] The vehicle connection circuit according to claim 1 allows for the handling of each of the multiple short-circuit modes with the minimum necessary number of fuses in a vehicle equipped with multiple batteries. Here, "minimum necessary number" means the number of fuses is the minimum required; for example, if there are three short-circuit modes with two batteries, each of the three short-circuit modes can be handled with three fuses. This reduces costs and simplifies the structure.

[0008] The vehicle connection circuit according to claim 2 is the vehicle connection circuit according to claim 1, wherein the first fuse is positioned closer to the branching point between the first path and the third path.

[0009] In the vehicle connection circuit according to claim 2, the circuit can be shut off on the upstream side if a short circuit occurs in the first path.

[0010] The vehicle connection circuit according to claim 3 is the vehicle connection circuit according to claim 1, wherein the second fuse is positioned closer to the confluence point of the second path and the third path.

[0011] In the vehicle connection circuit according to claim 3, the circuit can be shut off on the upstream side if a short circuit occurs in the second path.

[0012] The vehicle connection circuit according to claim 4 is the vehicle connection circuit according to claim 1, wherein the third fuse is located near the confluence point of the first path, the second path, and the third path.

[0013] In the vehicle connection circuit according to claim 4, the circuit can be shut off on the upstream side if a short circuit occurs in the third path.

[0014] The vehicle battery structure according to claim 5 comprises a first battery, a second battery configured to be connectable to the first battery, and a vehicle connection circuit according to any one of claims 1 to 4, which is interposed between the first battery, the second battery, and a motor, and electrically connects the first battery, the second battery, and the motor.

[0015] In the vehicle battery structure according to claim 5, in a vehicle equipped with multiple batteries, each of the multiple short-circuit modes can be handled with the minimum necessary fuse. [Effects of the Invention]

[0016] As described above, according to this disclosure, in a vehicle equipped with multiple batteries, each of the multiple short-circuit modes can be addressed with the minimum number of fuses required. [Brief explanation of the drawing]

[0017] [Figure 1] This block diagram shows an example of the configuration of a vehicle battery structure mounted on a vehicle according to the embodiment. [Figure 2] This figure shows an example of the circuit configuration of a vehicle battery structure according to the embodiment. [Figure 3] This figure shows an example of the circuit configuration of a vehicle battery structure according to the embodiment. [Figure 4] This figure shows an example of the circuit configuration of a vehicle battery structure according to the embodiment. [Figure 5] This figure shows the circuit configuration of a vehicle battery structure related to a comparative example.

Mode for Carrying Out the Invention

[0018] Hereinafter, an example of a mode for carrying out the technology of the present disclosure will be described in detail with reference to the drawings.

[0019] FIG. 1 is a block diagram showing an example of the configuration of a vehicle battery structure 100 mounted on a vehicle 200 according to the present embodiment. As shown in FIG. 1, the vehicle 200 according to the present embodiment is equipped with a vehicle battery structure 100 and a motor 40 for driving the vehicle 200. The vehicle battery structure 100 includes a battery 10 and a junction block 20, and the battery 10 includes a first battery 11 and a second battery 12. The first battery 11 and the second battery 12 are configured to be connectable to each other. The junction block 20 is an example of a vehicle connection circuit, and is interposed between the first battery 11 and the second battery 12 and the motor 40, and electrically connects the first battery 11, the second battery 12, and the motor 40.

[0020] FIGS. 2 to 4 are diagrams showing an example of the circuit configuration of the vehicle battery structure 100 according to the present embodiment. The circuit configurations of FIGS. 2 to 4 are the same. FIG. 2 shows a first path 51 (thick line), FIG. 3 shows a second path 52 (thick line), and FIG. 4 shows a third path 53 (thick line). The dotted arrows in FIGS. 2 to 4 indicate the direction in which the current flows.

[0021] As shown in FIGS. 2 to 4, when rapidly charging using the DC inlet 68, the junction block 20 is connected to the DC inlet 68 for rapidly charging the first battery 11 and the second battery 12. On the other hand, when normally charging using the 2-in-1 charger 60, the junction block 20 is connected to the solar panel 64 and the accessory battery 65 for normally charging the first battery 11 and the second battery 12 via the 2-in-1 charger 60. Also, the junction block 20 may be connected to a wiring plug connector (so-called AC100V outlet) 66 or an AC inlet 67 for charging the first battery 11 and the second battery 12 via the 2-in-1 charger 60. The 2-in-1 charger 60 includes a filter 61, a DC-DC converter 62, and an OBC (On-board Battery Charger) 63. The DC-DC converter 62 is connected to the solar panel 64 and the accessory battery 65, and converts the DC voltage supplied from the solar panel 64 and the accessory battery 65 into a predetermined DC voltage corresponding to the first battery 11 and the second battery 12. The OBC 63 is connected to the wiring plug connector 66 or the AC inlet 67, and converts the AC voltage supplied from the wiring plug connector 66 or the AC inlet 67 into a predetermined DC voltage corresponding to the first battery 11 and the second battery 12. Each of the DC-DC converter 62 and the OBC 63 is connected to the junction block २०.

[0022] The junction block 20 includes a positive-side system main relay 21, a first current sensor 22, a first fuse 23, a first DC relay 24, a DC fuse 25, a second DC relay 26, a second current sensor $27$, a second fuse $28$, a third DC relay 29, a third fuse 30, a negative-side system main relay 31, an AC fuse 32, a positive-side system sub-relay 33, a fourth DC relay 34, a fifth DC relay 35, and a voltage sensor 36.

[0023] One end of wiring W1 is connected to the positive side of DC inlet 68, and the other end is connected to wiring W2 via contact P1. One end of wiring W2 is connected to motor 40, and the other end is connected to the positive side of first battery 11. One end of wiring W3 is connected to the negative side of first battery 11, and the other end is connected to wiring W5 via contact P4. One end of wiring W4 is connected to wiring W3 via contact P3, and the other end is connected to wiring W6 via contact P5. One end of wiring W5 is connected to motor 40, and the other end is connected to the positive side of second battery 12. One end of wiring W6 is connected to the negative side of second battery 12, and the other end is connected to motor 40. One end of wiring W7 is connected to the negative side of DC inlet 68, and the other end is connected to wiring W6 via contact P6. One end of wiring W8 is connected to the positive side of OBC63, and the other end is connected to wiring W1 via contact P8. One end of wiring W9 is connected to the negative side of OBC63, and the other end is connected to wiring W7 via contact P9. One end of wiring W10 is connected to the positive side of DCDC converter 62 and the positive side of OBC63, and the other end is connected to wiring W2 via contact P2. One end of wiring W11 is connected to the negative side of DCDC converter 62 and the negative side of OBC63, and the other end is connected to wiring W6 via contact P7.

[0024] The junction block 20 according to this embodiment includes a first path 51 (shown by a thick line in Figure 2), a second path 52 (shown by a thick line in Figure 3), and a third path 53 (shown by a thick line in Figure 4). The first path 51 is a path that charges only the first battery 11 from the DC inlet 68 and passes through wirings W1, W2, W3, W4, W6, and W7. The second path 52 is a path that charges only the second battery 12 from the DC inlet 68 and passes through wirings W1, W2, motor 40, and wirings W5, W6, and W7. The third path 53 is a path that charges both the first battery 11 and the second battery 12 from the DC inlet 68 and passes through wirings W1, W2, W3, W5, W6, and W7.

[0025] The positive-side system main relay 21 is located between contact P1 of wiring W1 and contact P2 of wiring W2, and switches between the first path 51 and the second path 52. The first current sensor 22 is located between the negative side of the first battery 11 of wiring W3 and contact P3, and measures the current flowing through the first path 51 or the third path 53. The first fuse 23 is located between contact P3 of wiring W4 and the first DC relay 24. The first DC relay 24 is located between the first fuse 23 and contact P5 of wiring W4, and switches between the first path 51 and the third path 53. The DC fuse 25 is located between contact P3 of wiring W3 and the second DC relay 26. The second DC relay 26 is located between the DC fuse 25 and contact P4 of wiring W3, and switches between the first path 51 and the third path 53. The second current sensor 27 is located between contact P4 of wiring W5 and the positive side of the second battery 12, and measures the current flowing through the second path 52 or the third path 53. The second fuse 28 is located between contact P4 of wiring W5 and the third DC relay 29. The third DC relay 29 is located between the second fuse 28 of wiring W5 and the motor 40, and switches between the first path 51 and the second path 52. The third fuse 30 is located between contact P5 of wiring W6 and the negative side system main relay 31. The negative side system main relay 31 is located between the third fuse 30 of wiring W6 and contact P7, and switches the first path 51, the second path 52, and the third path 53 on / off. The AC fuse 32 is located between the positive side system sub-relay 33 of wiring W10 and contact P2. The positive-side system sub-relay 33 is located between the AC fuse 32 of wiring W10 and the positive side of the DC-DC converter 62 and OBC 63, and switches the connection / disconnection with the 2-in-1 charger 60. The fourth DC relay 34 is located between contacts P9 and P6 of wiring W7, and switches the connection / disconnection with the DC inlet 68. The fifth DC relay 35 is located between contacts P1 and P8 of wiring W1, and switches the connection / disconnection with the DC inlet 68. The voltage sensor 36 is located between wiring W1 and wiring W7, and measures the voltage between wiring W1 and wiring W7.

[0026] In this embodiment, the first fuse 23 is positioned on a path that does not overlap with the second path 52 and the third path 53 in the first path 51. In other words, the first fuse 23 only needs to be positioned between contact P3 and contact P5. Contact P3 is the branching point between the first path 51 and the third path 53. It is desirable that the first fuse 23 be positioned closer to contact P3, or in other words, in the vicinity of contact P3, between contact P3 and contact P5. That is, the closer the first fuse 23 is positioned to the first battery 11, the more upstream the circuit can be interrupted.

[0027] The second fuse 28 is positioned on a path that does not overlap with the first path 51 and the third path 53 in the second path 52. In other words, the second fuse 28 only needs to be positioned between contact P4 and the motor 40. Contact P4 is the junction point of the second path 52 and the third path 53. It is desirable that the second fuse 28 be positioned closer to contact P4, or in other words, in the vicinity of contact P4, between contact P4 and the motor 40. In other words, the closer the second fuse 28 is positioned to the second battery 12, the more upstream the circuit can be interrupted.

[0028] The third fuse 30 is located on the path where the first path 51, the second path 52, and the third path 53 all overlap. In other words, the third fuse 30 should be located between contact P5 and contact P6. Contact P5 is the confluence point of the first path 51, the second path 52, and the third path 53. It is desirable that the third fuse 30 be located closer to contact P5, or in other words, near contact P5, between contact P5 and contact P6. In other words, the closer the third fuse 30 is located to the second battery 12, the more upstream the circuit can be interrupted.

[0029] As described above, by arranging the first fuse 23, the second fuse 28, and the third fuse 30, the three fuses can handle various short-circuit modes. For example, the DC inlet 68 can be set to 400V, the first fuse 23 to 400A, and the second fuse 28 to 400A. In this case, 400V charging of the first battery 11 or 400V charging of the second battery 12 becomes possible. If a short circuit occurs due to a malfunction or the like while charging the first battery 11, the circuit is interrupted by blowing the first fuse 23 on the first path 51. Similarly, if a short circuit occurs due to a malfunction or the like while charging the second battery 12, the circuit is interrupted by blowing the second fuse 28 on the second path 52. Alternatively, for example, the DC inlet 68 can be set to 800V and the third fuse 30 to 700A. In this case, 800V charging of both the first battery 11 and the second battery 12 becomes possible. If a short circuit occurs due to a malfunction or other reason while charging the first battery 11 and the second battery 12, the circuit is interrupted by blowing the third fuse 30 on the third path 53. Furthermore, 800V charging of the first battery 11 and the second battery 12 is possible even while driving. Even while driving, if a short circuit occurs due to a malfunction or other reason while charging the first battery 11 and the second battery 12, the circuit is interrupted by blowing the third fuse 30 on the third path 53.

[0030] Figure 5 shows the circuit configuration of a vehicle battery structure 100A according to a comparative example. In Figure 5, the first path 51 is shown by a fine dotted line, the second path 52 is shown by a dashed line, and the third path 53 is shown by a coarse dotted line. As shown in Figure 5, the vehicle battery structure 100A according to a comparative example includes a junction block 20A. The junction block 20A includes a fourth fuse 37 (e.g., 700A) and a fifth fuse 38 (e.g., 700A) instead of the first fuse 23 and the second fuse 28.

[0031] The fourth fuse 37 is located between contact P2 of wiring W2 and the positive side of the first battery 11. The fifth fuse 38 is located between the negative side of the second battery 12 of wiring W6 and contact P5. The third fuse 30 is located between contacts P5 and P6 of wiring W6. In this case, since the fourth fuse 37 is shared by the first path 51 and the third path 53, it cannot be used to protect against short circuits in each path. In other words, if the fourth fuse 37 blows, the first path 51 and the third path 53 become unusable. Also, the amperage (capacity) of the fourth fuse 37 needs to be increased (for example, to 700A) to protect against short circuits in the third path 53. Similarly, since the fifth fuse 38 is shared by the second path 52 and the third path 53, it cannot be used to protect against short circuits in each path. In other words, if the fifth fuse 38 blows, the second path 52 and the third path 53 become unusable. Furthermore, in order to accommodate the third path 53, the amperage (capacity) of the fifth fuse 38 needs to be increased (for example, to 700A).

[0032] In contrast, in the junction block 20 according to this embodiment, a first fuse 23, a second fuse 28, and a third fuse 30 are provided for each of the first path 51, second path 52, and third path 53, respectively, so that a short circuit in each path can be addressed. In other words, even if the first fuse 23 blows, the second path 52 and the third path 53 can still be used. Also, since the first fuse 23 is not shared with the third path 53, the amperage (capacity) of the first fuse 23 can be reduced (for example, to 400A). Similarly, even if the second fuse 28 blows, the first path 51 and the third path 53 can still be used. Also, since the second fuse 28 is not shared with the third path 53, the amperage (capacity) of the second fuse 28 can be reduced (for example, to 400A).

[0033] Thus, according to this embodiment, in a vehicle equipped with multiple batteries, each of the multiple short-circuit modes can be handled with the minimum necessary fuses.

[0034] The technical scope of this disclosure is not limited to the embodiments described above. Various modifications or improvements can be made to the embodiments without departing from the spirit, and such modified or improved forms are also included within the technical scope of this disclosure. [Explanation of symbols]

[0035] 11. Battery No. 1 12 Second Battery 20 Junction Blocks 23 First Fuse 28 Second Fuse 30 Third Fuse 40 motors 51 First Route 52 Second Route 53 Third Route 100 Vehicle Battery Structure 200 vehicles

Claims

1. A vehicle connection circuit interposed between a first battery and a second battery, which are installed in a vehicle and configured to be connectable to each other, and a motor, which electrically connects the first battery, the second battery, and the motor, A first path for charging only the first battery, A second path that charges only the second battery, A third path for charging the first battery and the second battery, A first fuse is provided on a path in the first path that does not overlap with the second and third paths, A second fuse is provided on a path in the second path that does not overlap with the first path and the third path, A third fuse is provided on a path where the first path, the second path, and the third path all overlap, Vehicle connection circuit including.

2. The first fuse is located near the branching point of the first path and the third path. The vehicle connection circuit according to claim 1.

3. The second fuse is positioned near the junction of the second and third paths. The vehicle connection circuit according to claim 1.

4. The third fuse is located near the junction of the first path, the second path, and the third path. The vehicle connection circuit according to claim 1.

5. First battery and A second battery configured to be connectable to the first battery, A vehicle connection circuit according to any one of claims 1 to 4, interposed between the first battery and the second battery and the motor, and electrically connecting the first battery, the second battery and the motor, A vehicle battery structure equipped with the following features.

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