Power distribution circuit, circuit board, power distribution box and electric vehicle

Abstract

The embodiment of the invention provides a power distribution circuit, a circuit board, a power distribution box and an electric vehicle. The power distribution circuit comprises a vehicle-mounted charger amp; a DC converter, a first connector, a second connector, a first fuse, a second fuse, and a first position; the first position comprises two ends which are not connected with each other; a vehicle-mounted charger amp; the output positive electrode of the direct-current converter is electrically connected with the first end of the first fuse, and the second end of the first fuse is electrically connected with the first end of the first connector and the first end of the second fuse; the second end of the second fuse is electrically connected with the first end of the first position; the second end of the first position is electrically connected with the first end of the second connector; a vehicle-mounted charger amp; the output negative electrode of the direct-current converter is electrically connected with the second end of the first connector and the second end of the second connector; the first position is used for accessing a first relay or accessing a first copper bar. The high-voltage power distribution box can meet power distribution requirements of various different vehicle types, and customized development of the high-voltage power distribution box and an internal circuit board thereof is reduced.

Description

[Technical field]

[0001] The present invention relates to the field of electric vehicles, and in particular to a power distribution circuit, a circuit board, a power distribution box and an electric vehicle. [Background technology]

[0002] Different models have different power distribution requirements. For example, some models include a heater for the passenger compartment (Positive-Temperature-Coefficient, PTC), some have their own controller and do not need to be configured with relays; some do not have a controller and need to be controlled by external relays. Due to the different power distribution solutions required by different models, the high-voltage distribution box and its internal circuit board usually need to be customized. [Summary of the invention]

[0003] In view of this, an embodiment of the present invention provides a power distribution circuit, a circuit board, a distribution box and an electric vehicle, which can adapt to the power distribution requirements of a variety of different vehicle models and reduce the customized development of high-voltage distribution boxes and their internal circuit boards.

[0004] In a first aspect, an embodiment of the present invention provides a power distribution circuit, the power distribution circuit comprising: an on-board charger & DC converter, a first connector, a second connector, a first fuse, a second fuse, and a first position;

[0005] The first position includes two ends that are not connected to each other;

[0006] The output positive electrode of the vehicle charger & DC converter is electrically connected to the first end of the first fuse, the second end of the first fuse is electrically connected to the first end of the first connector and the first end of the second fuse; the second end of the second fuse is electrically connected to the first end of the first position;

[0007] The second end of the first position is electrically connected to the first end of the second connector;

[0008] The output negative electrode of the vehicle charger & DC converter is electrically connected to the second end of the first connector and the second end of the second connector;

[0009] The first position is used to connect to the first relay or the first copper busbar. The power distribution circuit provided by the embodiment of the present invention reserves a relay installation position so that the second connector can be configured with 0 relays or 1 relay, thereby realizing 2 different power distribution functions and adapting to the power distribution requirements of various different vehicle models, thereby reducing the customized development of the high-voltage distribution box and its internal circuit board.

[0010] On the other hand, an embodiment of the present invention provides a circuit board, including the above-mentioned power distribution circuit. Since the circuit board provided in the embodiment of the present invention includes the above-mentioned power distribution circuit, it can also adapt to the power distribution requirements of various different vehicle models, reducing the customized development of the high-voltage distribution box and its internal circuit board.

[0011] On the other hand, an embodiment of the present invention provides a power distribution box, including the above-mentioned circuit board. Since the power distribution box provided in the embodiment of the present invention includes the above-mentioned circuit board, it can also adapt to the power distribution requirements of various different vehicle models, reducing the customized development of the high-voltage power distribution box and its internal circuit board.

[0012] On the other hand, an embodiment of the present invention provides an electric vehicle, including the above-mentioned power distribution box. Since the electric vehicle provided in the embodiment of the present invention includes the above-mentioned power distribution box, it can also adapt to the power distribution requirements of various different models, reducing the customized development of the high-voltage power distribution box and its internal circuit board.

Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of a power distribution circuit provided by an embodiment of the present invention;

[0015] Figure 2 for Figure 1 A schematic diagram of a power distribution circuit in which a first relay is connected to the first position;

[0016] Figure 3 for Figure 1 A schematic diagram of a power distribution circuit connected to a first copper busbar at a first position;

[0017] Figure 4 A schematic diagram of another power distribution circuit provided by an embodiment of the present invention;

[0018] Figure 5 for Figure 4 A schematic diagram of a power distribution circuit in which a third fuse is connected to the second position and the third position is empty;

[0019] Figure 6 for Figure 4 A schematic diagram of a power distribution circuit in which the second position is empty and the third position is connected to the second copper busbar;

[0020] Figure 7 A schematic diagram of another power distribution circuit provided by an embodiment of the present invention;

[0021] Figure 8 for Figure 7 The fifth position is used to connect to the third relay or the fourth copper busbar.

[0022] Fig. 9 for Figure 8 Schematic diagram of a power distribution circuit with 0 relays configured in the third connector;

[0023] Fig.10 for Figure 8 A schematic diagram of a power distribution circuit in which a third connector is configured with a relay;

[0024] Fig.11 for Figure 8 A schematic diagram of a power distribution circuit in which a third connector is configured with a relay;

[0025] Fig.12 for Figure 8 Schematic diagram of a power distribution circuit with two relays configured in the third connector;

[0026] Fig.13 A schematic diagram of a circuit board provided by an embodiment of the present invention;

[0027] Fig.14 A schematic diagram of a power distribution box provided in an embodiment of the present invention;

[0028] Fig.15 A schematic diagram of an electric vehicle provided in an embodiment of the present invention. [Specific implementation method]

[0029] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0032] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] Figure 1 A schematic diagram of a power distribution circuit provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the power distribution circuit provided by the embodiment of the present invention includes: an on-board charger (OBC) & a DC-DC converter (DCDC) 1, a first connector 2, a second connector 3, a first fuse 5, a second fuse 6, and a first position 7; the first position 7 includes two ends that are not connected to each other;

[0034] The input end of the vehicle charger & DC converter 1 is used to be electrically connected to an AC power source;

[0035] The output positive electrode 11 of the on-board charger & DC converter 1 is electrically connected to the first end 51 of the first fuse 5, and the second end 52 of the first fuse 5 is electrically connected to the first end 21 of the first connector 2 and the first end 61 of the second fuse 6;

[0036] The second end 62 of the second fuse 6 is electrically connected to the first end 71 of the first position 7;

[0037] The second end 72 of the first position 7 is electrically connected to the first end 31 of the second connector 3;

[0038] The output negative electrode 12 of the vehicle charger & DC converter 1 is electrically connected to the second end 22 of the first connector 2 and the second end 32 of the second connector 3;

[0039] The first position 7 is used to connect the first relay or the first copper busbar.

[0040] like Figure 1 As shown, the power distribution circuit provided in the embodiment of the present invention further includes: a relay power supply positive electrode H0 and a first relay power supply negative electrode H1.

[0041] For example, Figure 2 for Figure 1 The schematic diagram of the power distribution circuit in which the first position is connected to the first relay is as follows: Figure 2As shown, the first end 71 of the first position 7 is used to be electrically connected to the first load end A1 of the first relay A, and the second end 72 of the first position 7 is used to be electrically connected to the second load end A2 of the first relay A. The positive electrode H0 of the relay power supply is used to be electrically connected to the first control end A3 of the first relay A, and the negative electrode H1 of the first relay power supply is used to be electrically connected to the second control end A4 of the first relay A.

[0042] For example, Figure 3 for Figure 1 The schematic diagram of the power distribution circuit connected to the first copper busbar at the first position is as follows: Figure 3 As shown, the first end 71 and the second end 72 of the first position 7 are electrically connected through the first copper bus B.

[0043] The power distribution circuit provided in the embodiment of the present invention reserves a relay installation position so that the second connector 3 can be configured with 0 relays (see Figure 3 ) or 1 relay (see Figure 2 ), so it can realize 2 different power distribution functions, be compatible with the power distribution requirements of 2 different models, improve the versatility of the power distribution circuit, and thus reduce the customized development of the high-voltage distribution box and its internal circuit board.

[0044] like Figure 1-Figure 3 As shown, the power distribution circuit provided in the embodiment of the present invention is arranged on a circuit board N.

[0045] The first connector 2 includes two ends, namely a first end 21 and a second end 22. Therefore, the first connector 2 is a 2-pin connector, which is usually used to connect a power battery inside a car.

[0046] The second connector 3 includes two ends, namely a first end 31 and a second end 32. Therefore, the second connector 3 is also a 2-pin connector, which is usually used to connect high-voltage electrical appliances inside the car, such as an air-conditioning compressor or a passenger compartment PTC.

[0047] Figure 4 A schematic diagram of another power distribution circuit provided by an embodiment of the present invention is shown as follows: Figure 4 As shown, compared to Figure 1 The power distribution circuit shown, Figure 4 The power distribution circuit shown also includes: a third connector 4, a second position 8, a third position 9, and a fourth position C.

[0048] The second position 8, the third position 9, and the fourth position C each include two ends that are not connected to each other;

[0049] The first end 81 of the second position 8 is electrically connected to the second end 52 of the first fuse 5 and the first end 61 of the second fuse 6; the first end 91 of the third position 9 is electrically connected to the second end 62 of the second fuse 6 and the first end 71 of the first position 7; the second end 82 of the second position 8 is electrically connected to the second end 92 of the third position 9 and the first end C1 of the fourth position C; the second end C2 of the fourth position C is electrically connected to the first end 41 of the third connector 4;

[0050] The output negative electrode 13 of the on-board charger & DC converter 1 is also electrically connected to the second end 42 of the third connector 4;

[0051] The second position 8 is used to connect the third fuse or is empty;

[0052] The third position 9 is used to connect the second copper bar when the second position 8 is empty or is empty when the second position 8 is connected to the third fuse;

[0053] The fourth position C is used to connect the second relay or the third copper busbar.

[0054] The second copper busbar and the third fuse are mutually exclusive. Figure 4 Both cannot exist at the same time in the distribution circuit shown.

[0055] When the second position 8 and the third position 9 are empty, the two ends are disconnected and there is no need to use a copper busbar to connect them.

[0056] like Figure 4 As shown, the power distribution circuit provided in the embodiment of the present invention further includes: a second relay power supply negative electrode H2.

[0057] For example, Figure 5 for Figure 4 A schematic diagram of a power distribution circuit in which the third fuse is connected to the second position and the third position is empty. Figure 5 As shown, when the second position 8 is connected to the third fuse D and the third position 9 is empty, the second connector 3 uses the second fuse 6 and the third connector 4 uses the third fuse D. Therefore, the second connector 3 and the third connector 4 do not share a fuse. At this time, the first position 7 and the fourth position C can be connected to a relay or a copper busbar. For example, Figure 5 As shown, the first position 7 is connected to the first copper bus B, and the first end 71 and the second end 72 of the first position 7 are electrically connected through the first copper bus B; the fourth position C is connected to the third copper bus B, and the first end C1 and the second end C2 of the fourth position C are electrically connected through the third copper bus B.

[0058] For example, Figure 6 for Figure 4 The second position is empty and the third position is connected to the second copper busbar. Figure 6As shown, when the second position 8 is empty and the third position 9 is connected to the second copper busbar E, the second connector 3 and the third connector 4 share the second fuse 6 .

[0059] Therefore, the second connector 3 and the third connector 4 share a fuse. At this time, the first position 7 and the fourth position C can be connected to a relay or a copper busbar. Figure 6 As shown, the first position 7 is connected to the first relay A; the fourth position C is connected to the second relay F.

[0060] like Figure 6 As shown, the first end C1 of the fourth position C is used to be electrically connected to the first load end F1 of the second relay F, and the second end C2 of the fourth position C is used to be electrically connected to the second load end F2 of the second relay F; the relay power supply positive electrode H0 is also used to be electrically connected to the first control end F3 of the second relay F, and the second relay power supply negative electrode H2 is used to be electrically connected to the second control end F4 of the second relay F.

[0061] Therefore, the power distribution circuit provided in the embodiment of the present invention can achieve the following power distribution requirements by reserving relay installation positions, copper busbar connection points and fuse installation points:

[0062] 1) The second connector 3 can be configured with 0 relays or 1 relay;

[0063] 2) The second connector 3 and the third connector 4 can share a fuse (see Figure 6 ) or do not share a fuse (see Figure 5 );

[0064] 3) The third connector 4 can be configured with 0 relays (see Figure 5 ) or 1 relay (see Figure 6 ).

[0065] Therefore, the power distribution circuit provided by the embodiment of the present invention can realize 8 different power distribution functions, be compatible with the power distribution requirements of 8 different vehicle models, improve the versatility of the power distribution circuit, and thus reduce the customized development of the high-voltage distribution box and its internal circuit board.

[0066] Figure 4-Figure 6 In the embodiment, the third connector 4 includes two ends, namely a first end 41 and a second end 42. Therefore, the third connector 4 can be configured as a 2-pin connector, which is usually used to connect high-voltage electrical appliances inside the car, such as an air conditioning compressor or a passenger compartment PTC.

[0067] Figure 7 A schematic diagram of another power distribution circuit provided by an embodiment of the present invention is shown as follows: Figure 7 As shown, compared to Figure 4 The power distribution circuit shown, Figure 7The power distribution circuit shown also includes: a fifth position J; the fifth position J includes two terminals that are not connected to each other; the fifth position J is used to connect to the third relay K or to connect to the fourth copper busbar L or is empty.

[0068] In some possible embodiments, the fifth position J is empty, and the two ends of the fifth position J are not connected to the circuit.

[0069] In some possible embodiments, the fifth position J is used to connect to the third relay K or the fourth copper bus L.

[0070] For example, Figure 8 for Figure 7 The fifth position is used to connect to the third relay or the fourth copper bar of the power distribution circuit, as shown in the figure. Figure 8 As shown, the first end J1 of the fifth position J is electrically connected to the second end 82 of the second position 8, the second end 92 of the third position 9, and the first end C1 of the fourth position C;

[0071] The second end J2 of the fifth position J is electrically connected to the third end 43 of the third connector 4;

[0072] The output negative electrode 12 of the on-board charger & DC converter 1 is also electrically connected to the fourth end 44 of the third connector 4;

[0073] Compared to Figure 4-Figure 7 , Figure 8 The third connector 4 in the embodiment also includes a third end 43 and a fourth end 4. Therefore, the third connector 4 can be configured as a 2-pin connector or a 4-pin connector.

[0074] like Figure 7-Figure 8 As shown, the power distribution circuit provided in the embodiment of the present invention further includes: a third relay power supply negative electrode H3.

[0075] For example, Fig. 9 for Figure 8 The schematic diagram of the power distribution circuit with 0 relays configured in the third connector is as follows: Fig. 9 As shown, the fourth position C is connected to the third copper bar B, and the first end C1 and the second end C2 of the fourth position C are electrically connected through the third copper bar B; the fifth position J is connected to the fourth copper bar L, and the first end J1 and the second end J2 of the fifth position J are electrically connected through the fourth copper bar L, so the third connector is configured with 0 relays.

[0076] For example, Fig.10 for Figure 8 A schematic diagram of a power distribution circuit in which a third connector is configured with a relay, such as Fig.10As shown, the fourth position C is connected to the second relay F, and the fifth position J is connected to the fourth copper bar L. The first end J1 and the second end J2 of the fifth position J are electrically connected through the fourth copper bar L, so the third connector is configured with one relay.

[0077] For example, Fig.11 for Figure 8 A schematic diagram of a power distribution circuit in which a third connector is configured with a relay, such as Fig.11 As shown, the fourth position C is connected to the third copper busbar B, and the first end C1 and the second end C2 of the fourth position C are electrically connected through the third copper busbar B; the fifth position J is connected to the third relay K, so the third connector is configured with 1 relay.

[0078] Among them, the first end J1 of the fifth position J is used to be electrically connected to the first load end K1 of the third relay K, and the second end J2 of the fifth position J is used to be electrically connected to the second load end K2 of the third relay K; the positive pole H0 of the relay power supply is used to be electrically connected to the first control end K3 of the third relay K, and the negative pole H3 of the third relay power supply is used to be electrically connected to the second control end K4 of the third relay K.

[0079] For example, Fig.12 for Figure 8 The schematic diagram of the power distribution circuit with two relays configured in the third connector is as follows: Fig.12 As shown, the fourth position C is connected to the second relay F, and the fifth position J is connected to the third relay K, so the third connector is configured with 2 relays.

[0080] In summary, the relays in the embodiments of the present invention all include two control terminals and two load terminals. The two control terminals are respectively connected to the positive and negative electrodes of the relay power supply; the two load terminals are connected to the two terminals at the location. Among them, the two load terminals of the relay are not polarity-specific.

[0081] When the third connector 3 is 2 pins, 0 or 1 relay can be configured. When the third connector 3 is 4 pins, 0, 1 or 2 relays can be configured.

[0082] The power distribution circuit provided in the embodiment of the present invention can meet the following power distribution requirements by reserving relay installation positions, copper busbar connection points and fuse installation points:

[0083] 1) The second connector 3 can be configured with 0 relays or 1 relay;

[0084] 2) The second connector 3 and the third connector 4 may share a fuse or may not share a fuse;

[0085] 3) The third connector 4 is compatible with 2pin and 4pin;

[0086] 3) The third connector 4 can be configured with 0 relays, 1 relay or 2 relays.

[0087] Table 1 20 power distribution schemes that can be implemented by the power distribution circuit provided by the embodiment of the present invention

[0088]

[0089] The above four requirements can be combined arbitrarily. As shown in Table 1, the power distribution circuit provided in the embodiment of the present invention can realize 20 different power distribution schemes and be compatible with the power distribution requirements of 20 different vehicle models, thereby improving the versatility of the power distribution circuit and reducing the customized development of the high-voltage distribution box and its internal circuit board.

[0090] Before electric vehicles leave the factory, manufacturers use Figure 7 When the power distribution circuit is shown, according to the power distribution requirements of the electric vehicle model, it can be determined whether the second connector and the third connector share a fuse, whether the second connector is configured with a relay, whether the third connector uses 2pin / 4pin, and the number of relays configured for the third connector.

[0091] For example, the power of high-voltage electrical appliances in electric vehicles is relatively large and must be equipped with separate insurance. In this case, it is necessary to select a second connector and a third connector that do not share a fuse.

[0092] For example, if the power of high-voltage electrical appliances in electric vehicles is relatively small, the second connector and the third connector can share a fuse to save costs.

[0093] An embodiment of the present invention further provides a circuit board, Fig.13 A schematic diagram of a circuit board provided by an embodiment of the present invention, such as Fig.13 As shown, the circuit board provided in the embodiment of the present invention includes the power distribution circuit in the above-mentioned power distribution circuit embodiment.

[0094] An embodiment of the present invention further provides a power distribution box. Fig.14 A schematic diagram of a power distribution box provided by an embodiment of the present invention, such as Fig.14 As shown, the power distribution box provided in the embodiment of the present invention includes the above-mentioned circuit board, and the circuit board includes the power distribution circuit in the above-mentioned power distribution circuit embodiment.

[0095] An embodiment of the present invention further provides an electric vehicle, Fig.15 A schematic diagram of an electric vehicle provided by an embodiment of the present invention is shown in FIG. Fig.15 As shown, the electric vehicle provided in the embodiment of the present invention includes the above-mentioned distribution box, and the distribution box includes the above-mentioned circuit board, and the circuit board includes the distribution circuit in the above-mentioned distribution circuit embodiment.

[0096] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A power distribution circuit, characterized in that: The power distribution circuit comprises: an on-board charger & DC converter (1), a first connector (2), a second connector (3), a first fuse (5), a second fuse (6), and a first position (7); The first position (7) includes two ends that are not connected to each other; The input end of the vehicle charger & DC converter (1) is used to be electrically connected to an AC power source; The output positive electrode (11) of the on-board charger & DC converter (1) is electrically connected to the first end (51) of the first fuse (5); the second end (52) of the first fuse (5) is electrically connected to the first end (21) of the first connector (2) and the first end (61) of the second fuse (6); the second end (62) of the second fuse (6) is electrically connected to the first end (71) of the first position (7); The second end (72) of the first position (7) is electrically connected to the first end (31) of the second connector (3); The output negative electrode (12) of the vehicle charger & DC converter (1) is electrically connected to the second end (22) of the first connector (2) and the second end (32) of the second connector (3); The first position (7) is used to connect to the first relay (A) or to connect to the first copper busbar (B).

2. The circuit according to claim 1, characterized in that The power distribution circuit also includes: a relay power supply positive electrode (H0), a first relay power supply negative electrode (H1); The first end (71) of the first position (7) is used to be electrically connected to the first load end (A1) of the first relay (A), and the second end (72) of the first position (7) is used to be electrically connected to the second load end (A2) of the first relay (A); The positive electrode (H0) of the relay power supply is used to be electrically connected to the first control end (A3) of the first relay (A), and the negative electrode (H1) of the first relay power supply is used to be electrically connected to the second control end (A4) of the first relay (A).

3. The circuit according to claim 1 or 2, characterized in that: The power distribution circuit further comprises: a third connector (4), a second position (8), a third position (9), and a fourth position (C); The second position (8), the third position (9), and the fourth position (C) each include two ends that are not connected to each other; The first end (81) of the second position (8) is electrically connected to the second end (52) of the first fuse (5) and the first end (61) of the second fuse (6); The first end (91) of the third position (9) is electrically connected to the second end (62) of the second fuse (6) and the first end (71) of the first position (7); The second end (82) of the second position (8), the second end (92) of the third position (9), and the first end (C1) of the fourth position (C) are electrically connected; The second end (C2) of the fourth position (C) is electrically connected to the first end (41) of the third connector (4); The output negative electrode (13) of the vehicle charger & DC converter (1) is also electrically connected to the second end (42) of the third connector (4); The second position (8) is used to connect the third fuse (D) or is empty; The third position (9) is used to connect the second copper busbar (E) when the second position (8) is empty or is empty when the second position (8) is connected to the third fuse (D); The fourth position (C) is used to connect to the second relay (F) or the third copper busbar (G).

4. The circuit according to claim 3, characterized in that The power distribution circuit further comprises: a second relay power supply cathode (H2); The first end (C1) of the fourth position (C) is used to be electrically connected to the first load end (F1) of the second relay (F), and the second end (C2) of the fourth position (C) is used to be electrically connected to the second load end (F2) of the second relay (F); The positive electrode (H0) of the relay power supply is also used to be electrically connected to the first control terminal (F3) of the second relay (F), and the negative electrode (H2) of the second relay power supply is used to be electrically connected to the second control terminal (F4) of the second relay (F).

5. The circuit according to claim 3, characterized in that The power distribution circuit further comprises: a fifth position (J); the fifth position (J) comprises two terminals which are not connected to each other; The fifth position (J) is used to connect to the third relay (K) or the fourth copper busbar (L) or is empty; When the fifth position (J) is empty, the two ends of the fifth position (J) are not connected to the circuit; When the fifth position (J) is used to connect to the third relay (K) or the fourth copper busbar (L), the first end (J1) of the fifth position (J) is electrically connected to the second end (82) of the second position (8), the second end (92) of the third position (9), and the first end (C1) of the fourth position (C); the second end (J2) of the fifth position (J) is electrically connected to the third end (43) of the third connector (4); and the output negative electrode (12) of the on-board charger & DC converter (1) is also electrically connected to the fourth end (44) of the third connector (4).

6. The circuit according to claim 5, characterized in that The power distribution circuit further includes: a third relay power supply negative electrode (H3); The first end (J1) of the fifth position (J) is used to be electrically connected to the first load end (K1) of the third relay (K), and the second end (J2) of the fifth position (J) is used to be electrically connected to the second load end (K2) of the third relay (K); The positive electrode (H0) of the relay power supply is used to be electrically connected to the first control end (K3) of the third relay (K), and the negative electrode (H3) of the third relay power supply is used to be electrically connected to the second control end (K4) of the third relay (K).

7. The circuit according to claim 3, characterized in that The first connector (2) is used for electrically connecting to a power storage battery inside the vehicle, and the second connector (3) and the third connector (4) are both used for electrically connecting to high-voltage electrical appliances inside the vehicle.

8. A circuit board, characterized in that: include: The power distribution circuit according to any one of claims 1 to 7.

9. A distribution box, characterized in that: include: The circuit board of claim 8.

10. An electric vehicle, characterized in that: Includes the distribution box as claimed in claim 9.

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