A power distribution circuit, a circuit board, a power distribution box and an electric vehicle

Abstract

The embodiment of the application provides a power distribution circuit, a circuit board, a power distribution box and an electric vehicle, and the power distribution circuit comprises: a vehicle-mounted charger & direct current 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; the output positive pole of the vehicle-mounted charger & direct current converter and the first end of the first fuse are electrically connected; 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 and the first end of the first position are electrically connected; the second end of the first position and the first end of the second connector are electrically connected; the output negative pole of the vehicle-mounted charger & direct current converter and the second end of the first connector and the second end of the second connector are electrically connected; and the first position is used for connecting a first relay or a first copper bar. The power distribution circuit can adapt to the power distribution requirements of various vehicle models, and the customized development of a high-voltage power distribution box and an internal circuit board thereof is reduced.

Description

[0001] The present application 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.

[0002] Different vehicle models have different power distribution requirements. For example, some vehicle models include a heater (Positive-Temperature-Coefficient, PTC) for the passenger compartment, some have controllers and do not need to be configured with relays, and some do not have controllers and need to be controlled by external relays. Because different vehicle models have different power distribution requirements, high-voltage power distribution boxes and their internal circuit boards usually need to be custom developed.

[0003] Therefore, the embodiments of the present application provide a power distribution circuit, a circuit board, a power distribution box and an electric vehicle, which can adapt to the power distribution requirements of various different vehicle models and reduce the custom development of high-voltage power distribution boxes and their internal circuit boards.

[0004] In a first aspect, the embodiments of the present application provide a power distribution circuit, which comprises: a vehicle charger & DC converter, a first connector, a second connector, a first fuse, a second fuse and a first position.

[0005] The first position comprises two ends that are not connected to each other.

[0006] The output positive pole 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, and 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 pole 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 for connecting a first relay or a first copper bar. The power distribution circuit provided by the embodiments of the present application can configure 0 relays or 1 relay through the reserved relay mounting position of the second connector, thereby realizing two different power distribution functions, adapting to the power distribution requirements of various different vehicle models, and reducing the custom development of high-voltage power distribution boxes and their internal circuit boards.

[0010] ​​​In another aspect, the embodiment of the present application provides a circuit board comprising the power distribution circuit. Since the circuit board provided by the embodiment of the present application comprises the power distribution circuit, the power distribution requirements of various vehicle models can be met, and the customized development of the high-voltage power distribution box and the internal circuit board thereof is reduced.

[0011] In another aspect, the embodiment of the present application provides a power distribution box comprising the circuit board. Since the power distribution box provided by the embodiment of the present application comprises the circuit board, the power distribution requirements of various vehicle models can be met, and the customized development of the high-voltage power distribution box and the internal circuit board thereof is reduced.

[0012] In another aspect, the embodiment of the present application provides an electric vehicle comprising the power distribution box. Since the electric vehicle provided by the embodiment of the present application comprises the power distribution box, the power distribution requirements of various vehicle models can be met, and the customized development of the high-voltage power distribution box and the internal circuit board thereof is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

[0015] Figure 2 A schematic diagram of a power distribution circuit provided by the embodiment of the present application; Figure 1 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0016] Figure 3 A schematic diagram of a power distribution circuit provided by the embodiment of the present application; Figure 1 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0017] Figure 4 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0018] Figure 5 A schematic diagram of a power distribution circuit provided by the embodiment of the present application; Figure 4 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0019] Figure 6 A schematic diagram of a power distribution circuit provided by the embodiment of the present application; Figure 4 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0020] Figure 7 A schematic diagram of a power distribution circuit provided by the embodiment of the present application;

[0021] Figure 8 for Figure 7 A schematic diagram of the power distribution circuit where the fifth position is used to connect to the third relay or the fourth copper busbar;

[0022] Figure 9 for Figure 8 A schematic diagram of a power distribution circuit with zero relays configured in the third connector.

[0023] Figure 10 for Figure 8 A schematic diagram of a power distribution circuit with a third connector configured with one relay;

[0024] Figure 11 for Figure 8 A schematic diagram of a power distribution circuit with a third connector and a relay;

[0025] Figure 12 for Figure 8 A schematic diagram of the power distribution circuit with two relays configured in the third connector;

[0026] Figure 13 A schematic diagram of a circuit board provided in an embodiment of the present invention;

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

[0028] Figure 15 This is a schematic diagram of an electric vehicle provided in an embodiment of the present invention.

Detailed Implementation Methods

[0029] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Figure 1 A schematic diagram of a power distribution circuit provided in an embodiment of the present invention is shown below. Figure 1 As shown, the power distribution circuit provided in this embodiment of the invention includes: an on-board charger (OBC) & 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 unconnected terminals;

[0034] The input terminal of the vehicle charger & DC converter 1 is used for electrical connection with an AC power source;

[0035] The positive output terminal 11 of the vehicle charger & DC converter 1 is electrically connected to the first terminal 51 of the first fuse 5, and the second terminal 52 of the first fuse 5 is electrically connected to the first terminal 21 of the first connector 2 and the first terminal 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 and the first end 31 of the second connector 3 are electrically connected;

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

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

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

[0041] For example, Figure 2 for Figure 1 A schematic diagram of the power distribution circuit where the first relay is connected at the first position is shown below. Figure 2As shown, the first end 71 of the first position 7 is electrically connected to the first load end A1 of the first relay A, and the second end 72 of the first position 7 is electrically connected to the second load end A2 of the first relay A. The positive pole H0 of the relay power supply is electrically connected to the first control end A3 of the first relay A, and the negative pole H1 of the first relay power supply is electrically connected to the second control end A4 of the first relay A.

[0042] Exemplarily, Figure 3 For Figure 1 The schematic diagram of the power distribution circuit in which the first position accesses the first copper bar is as shown in Figure 3 As shown, the first end 71 of the first position 7 is electrically connected to the first load end A1 of the first relay A, and the second end 72 of the first position 7 is electrically connected to the second load end A2 of the first relay A. The positive pole H0 of the relay power supply is electrically connected to the first control end A3 of the first relay A, and the negative pole H1 of the first relay power supply is electrically connected to the second control end A4 of the first relay A.

[0043] The power distribution circuit provided by the embodiment of the present application can make the second connector 3 configure 0 relay (see Figure 3 ) or 1 relay (see Figure 2 ), so as to realize two different power distribution functions and achieve the compatibility of the power distribution requirements of two different vehicle models, thereby improving the universality of the power distribution circuit and reducing the customized development of the high-voltage power distribution box and the internal circuit board thereof.

[0044] As shown, Figures 1-3 The power distribution circuit provided by the embodiment of the present application is arranged on the circuit board N.

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

[0046] The second connector 3 includes two ends, i.e., the first end 31 and the second end 32. Therefore, the second connector 3 is also a two-pin connector, which is usually used to connect the high-voltage electrical appliances inside the vehicle, such as the air conditioner compressor or the passenger cabin PTC, etc.

[0047] Figure 4 The schematic diagram of another power distribution circuit provided by the embodiment of the present application is as shown in Figure 4 Compared with the power distribution circuit shown in Figure 1 The power distribution circuit shown in Figure 4 The power distribution circuit further 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 and the second end 62 of the second fuse 6 and the first end 71 of the first position 7 are electrically connected; the second end 82 of the second position 8 and the second end 92 of the third position 9 are electrically connected to 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 negative output terminal 13 of the on-board charger & DC converter 1 is also electrically connected to the second terminal 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 busbar when the second position 8 is empty, or to be empty when the third fuse is connected to the second position 8.

[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 The two cannot coexist in the power distribution circuit shown.

[0055] When positions 8 and 9 are empty, the two ends are disconnected and no copper busbar is needed for connection.

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

[0057] For example, Figure 5 for Figure 4 A schematic diagram of a power distribution circuit where the third fuse is connected to the second position and the third position is empty. (See diagram below.) 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, as... Figure 5 As shown, the first position 7 is connected to the first copper busbar B, and the first end 71 and the second end 72 of the first position 7 are electrically connected through the first copper busbar B; 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.

[0058] For example, Figure 6 for Figure 4 The diagram shows a power distribution circuit where the second position is empty and the third position is connected to the second copper busbar. (See diagram for example.) 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 single 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, as... 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 terminal C1 of the fourth position C is used to electrically connect to the first load terminal F1 of the second relay F, and the second terminal C2 of the fourth position C is used to electrically connect to the second load terminal F2 of the second relay F; the positive terminal H0 of the relay power supply is also used to electrically connect to the first control terminal F3 of the second relay F, and the negative terminal H2 of the second relay power supply is used to electrically connect to the second control terminal F4 of the second relay F.

[0061] Therefore, the power distribution circuit provided in this embodiment of the invention can meet 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 single fuse (see...). Figure 6 ) or not sharing a single 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 in this embodiment of the invention can realize eight different power distribution functions, and is compatible with the power distribution needs of eight different vehicle models, thereby improving the versatility of the power distribution circuit and reducing the need for customized development of high-voltage power distribution boxes and their internal circuit boards.

[0066] Figures 4-6 In this design, the third connector 4 includes two ends: a first end 41 and a second end 42. Therefore, the third connector 4 can be configured as a 2-pin connector, typically used to connect high-voltage electrical components inside a vehicle, such as an air conditioning compressor or a passenger compartment PTC.

[0067] Figure 7 This is a schematic diagram of another power distribution circuit provided in an embodiment of the present invention, such as... Figure 7 As shown, compared to Figure 4 The power distribution circuit shown is Figure 7The power distribution circuit shown also includes: a fifth position J; the fifth position J includes two unconnected terminals; the fifth position J is used to connect to the third relay K or the fourth copper busbar L or is empty.

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

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

[0070] For example, Figure 8 for Figure 7 A schematic diagram of the power distribution circuit where the fifth position is used to connect the third relay or the fourth copper busbar, as shown below. Figure 8 As shown, the first end J1 of the fifth position J, 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.

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

[0072] The negative output terminal 12 of the vehicle charger & DC converter 1 is also electrically connected to the fourth terminal 44 of the third connector 4;

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

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

[0075] For example, Figure 9 for Figure 8 A schematic diagram of a power distribution circuit with zero relays configured for the third connector in the middle, as shown below. Figure 9 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 fourth copper busbar L, and the first end J1 and the second end J2 of the fifth position J are electrically connected through the fourth copper busbar L. Therefore, the third connector is configured with 0 relays.

[0076] For example, Figure 10 for Figure 8 A schematic diagram of a power distribution circuit with a third connector and one relay is shown below. Figure 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, 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 that the third connector is configured with one relay.

[0077] Exemplarily, Figure 11 For Figure 8 In another third connector, the schematic diagram of the power distribution circuit configured with one relay is shown in the figure, Figure 11 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; and the fifth position J is connected to the third relay K, so that the third connector is configured with one relay.

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

[0079] Exemplarily, Figure 12 For Figure 8 In another third connector, the schematic diagram of the power distribution circuit configured with one relay is shown in the figure, Figure 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 that the third connector is configured with two relays.

[0080] In summary, the relay in the embodiment of the application comprises two control ends and two load ends. The two control ends are connected to the positive and negative poles of the relay power supply respectively; and the two load ends are connected to the two ends of the position. Among them, the two load ends of the relay are not polarized.

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

[0082] The power distribution circuit provided by the embodiment of the application can realize the following power distribution requirements by reserving the relay installation position, the copper bar connection point and the fuse installation point.

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

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

[0085] 3) The third connector 4 can be 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 The power distribution circuit provided by the embodiment of the present application can realize 20 power distribution schemes

[0088]

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

[0090] Before the electric vehicle is shipped, the manufacturer uses Figure 7 The power distribution circuit shown in the figure, according to the power distribution requirements of the electric vehicle model, it can be decided 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 in the third connector.

[0091] For example, the power of the high-voltage electrical appliances in the electric vehicle is large, and must be separately configured with an insurance, at this time, the second connector and the third connector need to be selected not to share a fuse.

[0092] For example, the power of the high-voltage electrical appliances in the electric vehicle is small, and the second connector and the third connector can share a fuse, thereby saving cost.

[0093] The embodiment of the present application also provides a circuit board, Figure 13 A schematic diagram of a circuit board provided by the embodiment of the present application is shown in the figure, the circuit board provided by the embodiment of the present application includes the power distribution circuit in the power distribution circuit embodiment. Figure 13

[0094] The embodiment of the present application also provides a power distribution box, Figure 14 A schematic diagram of a power distribution box provided by the embodiment of the present application is shown in the figure, the power distribution box provided by the embodiment of the present application includes the circuit board, and the circuit board includes the power distribution circuit in the power distribution circuit embodiment. Figure 14

[0095] The embodiment of the present application also provides an electric vehicle, Figure 15 A schematic diagram of an electric vehicle provided by the embodiment of the present application is shown in the figure, the electric vehicle provided by the embodiment of the present application includes the power distribution box, and the power distribution box includes the circuit board, and the circuit board includes the power distribution circuit in the power distribution circuit embodiment. Figure 15

[0096] ​​​The above description is only the preferred embodiment of the present specification, and is not used to limit the present specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification shall be included in the protection scope of the present specification.

Claims

1. A power distribution circuit, characterized by, The power distribution circuit comprises: a vehicle charger & DC converter (1), a first connector (2), a second connector (3), a first fuse (5), a second fuse (6), a first position (7); The first position (7) comprises two ends that are not connected to each other; The input end of the vehicle charger & DC converter (1) is electrically connected to an AC power supply; The output positive pole (11) of the vehicle 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), and 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 pole (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 for connecting a first relay (A) or a first copper bar (B); The power distribution circuit further comprises a relay power supply positive pole (H0) and a first relay power supply negative pole (H1); The first end (71) of the first position (7) is electrically connected to the first load end (A1) of the first relay (A), and the second end (72) of the first position (7) is electrically connected to the second load end (A2) of the first relay (A); The relay power supply positive pole (H0) is electrically connected to the first control end (A3) of the first relay (A), and the first relay power supply negative pole (H1) is electrically connected to the second control end (A4) of the first relay (A); 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 comprise 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) 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); The output negative pole (13) of the vehicle charger & DC converter (1) is further electrically connected to the second end (42) of the third connector (4); The second position (8) is used for connecting a third fuse (D) or is empty. The third position (9) is used for connecting to the second copper bar (E) when the second position (8) is empty or connecting to the third fuse (D) when the second position (8) is connected to the third fuse (D); The fourth position (C) is used for connecting to the second relay (F) or connecting to the third copper bar (G); The power distribution circuit further comprises a fifth position (J); the fifth position (J) comprises two ends which are not connected to each other; The fifth position (J) is used for connecting to the third relay (K) or connecting to the fourth copper bar (L) or being 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 for connecting to the third relay (K) or connecting to the fourth copper bar (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 pole (12) of the vehicle-mounted charger & DC converter (1) is further electrically connected to the fourth end (44) of the third connector (4).

2. The circuit of claim 1, wherein, The power distribution circuit further comprises a second relay power supply negative pole (H2); The first end (C1) of the fourth position (C) is used for being 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 for being electrically connected to the second load end (F2) of the second relay (F); The relay power supply positive pole (H0) is further used for being electrically connected to the first control end (F3) of the second relay (F), and the second relay power supply negative pole (H2) is used for being electrically connected to the second control end (F4) of the second relay (F).

3. The circuit of claim 1, wherein, The power distribution circuit further comprises a third relay power supply negative pole (H3); The first end (J1) of the fifth position (J) is used for being 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 for being electrically connected to the second load end (K2) of the third relay (K); The relay power supply positive pole (H0) is used for being electrically connected to the first control end (K3) of the third relay (K), and the third relay power supply negative pole (H3) is used for being electrically connected to the second control end (K4) of the third relay (K).

4. The circuit of claim 1, wherein, The first connector (2) is used for being electrically connected to the power storage battery inside the automobile, and the second connector (3) and the third connector (4) are both used for being electrically connected to the high-voltage electrical appliances inside the automobile.

5. A circuit board, characterized by The power distribution circuit according to any one of claims 1-4. The circuit board according to claim 5.

6. A distribution box characterized in that, The power distribution box according to claim 6. ​ 7. An electric vehicle, characterized by ​

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