Battery pack

Abstract

The present application relates to the technical field of BDUs, and discloses a battery pack. A circuit board comprises a board body, circuit structures, and connecting points; the circuit structures are arranged on the board body, and a plurality of circuit structures are provided; each circuit structure comprises at least two printed branches, and the cross-sectional area A of a wire of each printed branch satisfies that 1 mm2≤A≤2 mm2; the connecting points are arranged on the printed branches, and the connecting points on the at least two printed branches of each circuit structure are used for connecting electrical devices of different specifications. In the circuit board provided by the present application, a plurality of electrical devices can be connected by means of the printed branches, thereby reducing the number of used wire harnesses, saving the assembly space, simplifying the assembly process, avoiding the defects such as mis-connection and missed connection, being conducive to implementing automated production, and avoiding the problems of wear and aging of wire harnesses.

Description

Battery pack

[0001] This application claims priority to Chinese Patent Application No. 2024116061193, filed on November 12, 2024, entitled "Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of BDU technology, specifically to battery packs. Background Technology

[0003] BDU (Battery Drive Unit) typically connects its internal electrical components using wiring harnesses and copper busbars. The numerous wiring harnesses inside are intricate and complex, making assembly cumbersome and prone to misconnections and omissions, which makes automated production difficult. Furthermore, the wiring harnesses are susceptible to wear and aging. Summary of the Invention

[0004] In view of this, this application provides a battery pack to solve the problem that the BDU contains a large number of wire harnesses, which are complicated, cumbersome to assemble, and prone to misconnection or omission.

[0005] This application provides a circuit board, including:

[0006] plate body;

[0007] A loop structure is provided on the board body and has multiple sets. Each set of the loop structure includes at least two printed branches. The area A of the trace cross-section of each printed branch satisfies 1mm. 2 ≤A≤2mm 2 ;

[0008] Connection points are provided on the printed branches, and the connection points on at least two of the printed branches in each group of the circuit structure are used to connect electrical components of different specifications.

[0009] Beneficial effects: The board has multiple sets of circuit structures, which can connect multiple electrical components through printed branches, reducing the use of wire harnesses, saving assembly space, simplifying the assembly process, avoiding problems such as misinterpretation and missing connections, and facilitating automated production; it also avoids wire harness wear and aging problems. Each set of circuit structures includes at least two printed branches. Although it can connect electrical components of different specifications, integrating them on the circuit board can easily cause heat dissipation problems. In this embodiment, the area A of the trace cross-section of each printed branch satisfies 1mm². 2 ≤A≤2mm 2 While meeting the requirements of the circuit board, it can also maintain spacing, which is conducive to heat dissipation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 is a schematic diagram of a BDU from one perspective according to an embodiment of this application;

[0012] Figure 2 is a schematic diagram of a BDU from another perspective according to an embodiment of this application;

[0013] Figure 3 is an exploded view of a BDU according to an embodiment of this application;

[0014] Figure 4 is a schematic diagram of a circuit board of a BDU according to an embodiment of this application.

[0015] Explanation of reference numerals in the attached drawings: 1. Plate body; 2. Heating fuse; 3. Heating relay; 4. Pre-charge relay; 5. Pre-charge resistor; 6. Second coil control terminal connection point; 7. Second load terminal connection point; 8. Third coil control terminal connection point; 9. Third load terminal connection point; 11. Fourth load terminal connection point; 12. Heating circuit positive connection point; 13. Heating circuit negative connection point; 14. Coil control external connection point; 15. Pre-charge circuit positive connection point; 16. Pre-charge circuit negative connection point; 20. First connection point; 30. Second connection point; 40. Third connection point; 50. Fourth connection point; 60. Rectangular frame; 10. First printing branch; 70. Second printing branch; 80. Third printing branch. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] The embodiments of this application are described below with reference to Figures 1 to 4.

[0018] According to an embodiment of this application, in one aspect, a circuit board is provided, including a board body 1, a circuit structure, and connection points; the circuit structure is disposed on the board body 1 and has multiple sets, each set of the circuit structure including at least two printed branches, and the area A of the trace cross-section of each printed branch satisfies 1mm². 2 ≤A≤2mm 2Connection points are set on the printed branches, and the connection points on at least two of the printed branches in each group of the circuit structure are used to connect electrical components of different specifications.

[0019] The board 1 has multiple sets of circuit structures, which can connect multiple electrical components through printed branches, reducing the use of wire harnesses, saving assembly space, simplifying the assembly process, avoiding problems such as misinterpretation and missing connections, and facilitating automated production; it also avoids wire harness wear and aging problems. Each set of circuit structures includes at least two printed branches. Although it can connect electrical components of different specifications, integrating them on the circuit board can easily cause heat dissipation problems. In this embodiment, the area A of the trace cross-section of each printed branch satisfies 1mm². 2 ≤A≤2mm 2 While meeting the requirements of the circuit board, it can also maintain spacing, which is conducive to heat dissipation.

[0020] Specifically, in this embodiment, the multiple loop structure consists of at least two loop structures, that is, two or more. The printed branches are the printed circuits on the circuit board in this embodiment.

[0021] In one specific embodiment, the area A of the trace cross-section of each of the printed branches is 1 mm². 2 .

[0022] In another specific embodiment, the area A of the trace cross-section of each of the printed branches is 2 mm². 2 .

[0023] In another specific embodiment, the area A of the trace cross-section of each of the printed branches is 1.5 mm². 2 .

[0024] As shown in Figure 4, the thickness of the printed traces is uniform. Therefore, the cross-sectional area of ​​the printed traces mainly depends on the area occupied by the printed traces on the board. The cross-sectional area of ​​the printed traces is perpendicular to the length direction of the board in Figure 4. Therefore, the cross-sectional area of ​​the printed traces in Figure 4 is mainly reflected in the space occupied by the printed traces in the width direction of the board. The various rectangular frames 60 in Figure 4 can represent the areas that can be covered on the board after different electrical components are connected.

[0025] In one embodiment, the circuit structure includes a heating circuit, the printed branches of the heating circuit include at least two first printed branches 10, the connection points of the first printed branches 10 include first connection points 20, and the first connection points 20 of the at least two first printed branches 10 are used to connect heating fuses 2 of different specifications.

[0026] At least two of the first connection points 20 of the first printed branch 10 are used to connect heating fuses 2 of different specifications, which can form heating circuits of different specifications to meet more usage needs.

[0027] As an alternative implementation, the heating fuse 2 can be of the same size and specification, and the corresponding first printed branch 10 and first connection point 20 can be set only in one set on the heating circuit.

[0028] Specifically, a fuse is a device that disconnects a circuit by melting one or more specially designed fusible elements when the current exceeds a specified value for a sufficiently long time.

[0029] In this embodiment, the function of the heating fuse is as follows: when a short circuit occurs in the heating circuit, the fusible element inside the heating fuse melts rapidly in a short time due to instantaneous heat accumulation, thereby disconnecting the heating circuit and protecting other electrical components, lines and batteries in the heating circuit from damage.

[0030] In one embodiment, at least two of the first connection points 20 are spaced apart, and the distance between any two of the first connection points 20 is between 38 mm and 40 mm.

[0031] The distance between each pair of the first connection points 20 is between 38mm and 40mm, which is compatible with the specifications of commonly used heating fuses 2. If the spacing is too large, it will be difficult to weld the terminals of the heating fuse 2 to the first connection point 20 of the circuit board, which will easily cause poor soldering and reduce the welding strength and reliability.

[0032] In one specific embodiment, at least two first connection points 20 are spaced apart, and the distance between any two first connection points 20 is 38mm.

[0033] In another specific embodiment, at least two of the first connection points 20 are spaced apart, with a distance of 39 mm between each pair of first connection points 20.

[0034] In another specific embodiment, at least two of the first connection points 20 are spaced apart, with a distance of 40 mm between each pair of the first connection points 20.

[0035] In one embodiment, the circuit structure includes a heating circuit, the printed branches of the heating circuit include at least two second printed branches 70, the connection points of the second printed branches 70 include second connection points 30, and the second connection points 30 of the at least two second printed branches 70 are used to connect heating relays 3 of different specifications.

[0036] At least two of the second printed branches 70 have their second connection points 30 used to connect heating relays 3 of different specifications, which can form heating circuits of different specifications to meet more usage needs.

[0037] Specifically, a relay is a non-manually operated mechanical switching device that has only one rest position and can connect, carry, and disconnect current under normal circuit conditions (including overload operating conditions).

[0038] In this embodiment, the heating relay 3 is used in the heating circuit as a switch to realize the on / off switching and overcurrent control of the heating circuit.

[0039] In a further embodiment, the plate 1 is also provided with a positive connection point 12 and a negative connection point 13 for the heating circuit. The positive connection point 12 and the negative connection point 13 are respectively connected to other electrical components of the BDU through wiring harnesses. The positive connection point 12 and the negative connection point 13 are spaced apart and located at both ends of the heating fuse 2.

[0040] In one embodiment, at least two second connection points 30 are distributed at intervals, and the distance B between any two second connection points 30 satisfies 14mm≤B≤21mm.

[0041] The distance B between any two second connection points 30 satisfies 14mm≤B≤21mm. This distance B is suitable for the specifications of commonly used heating relays 3. If the distance is too large, it will be difficult to solder the terminals of the heating relay 3 to the second connection point 30 of the circuit board, which will easily cause poor soldering and reduce the soldering strength and reliability.

[0042] In one specific embodiment, at least two second connection points 30 are spaced apart, and the distance B between any two second connection points 30 is 14 mm.

[0043] In another specific embodiment, at least two second connection points 30 are spaced apart, and the distance B between any two second connection points 30 is 21 mm.

[0044] In another specific embodiment, at least two second connection points 30 are spaced apart, and the distance B between any two second connection points 30 is 17 mm.

[0045] In a specific implementation, the second connection point 30 includes a second coil control terminal connection point 6 and a second load terminal connection point 7. The second coil control terminal connection point 6 and the second load terminal connection point 7 are respectively connected to different terminals of the heating relay 3 to cooperate with the second printed branch 70 to realize the connection of the heating circuit.

[0046] In a further embodiment, the second coil control terminal connection point 6 has at least two spaced-apart points, and the distance between each pair of second coil control terminal connection points 6 is between 18.7 mm and 20.3 mm.

[0047] In a further embodiment, the second load end connection point 7 has at least two spaced apart, and the distance between each two second load end connection points 7 is between 14.9 mm and 16.5 mm.

[0048] In one embodiment, the area C of the printed branch trace of the heating circuit satisfies 1 mm². 2 ≤C≤2mm 2 .

[0049] If the cross-sectional area C of the printed branch of the heating circuit is too small, it cannot meet the overcurrent requirements of the heating circuit, leading to severe overheating or even burning of the circuit board; if the cross-sectional area C of the printed branch of the heating circuit is too large, it occupies too much space on the board body 1, which is not conducive to wiring. In this embodiment, the cross-sectional area C of the printed branch of the heating circuit satisfies 1mm². 2 ≤C≤2mm 2 This can meet the overcurrent requirements of the heating circuit without taking up too much space on plate 1.

[0050] In one specific embodiment, the area C of the printed branch trace of the heating circuit is 1 mm². 2 .

[0051] In another specific embodiment, the area C of the cross-sectional area of ​​the printed branch of the heating circuit is 2 mm². 2 .

[0052] In another specific embodiment, the area C of the printed branch trace of the heating circuit is 1.5 mm². 2 .

[0053] In one embodiment, the circuit structure includes a pre-charge circuit, the printed branches of the pre-charge circuit include at least two third printed branches 80, the connection points of the third printed branches 80 include a third connection point 40 and a fourth connection point 50, the third connection points 40 of the at least two third printed branches 80 are used to connect pre-charge relays 4 of different specifications, and the fourth connection points 50 of the at least two third printed branches 80 are used to connect pre-charge resistors 5 of different specifications.

[0054] At least two of the third printed branches 80 have third connection points 40 for connecting precharge relays 4 of different specifications, and at least two of the third printed branches 80 have fourth connection points 50 for connecting precharge resistors 5 of different specifications, which can form precharge circuits of different specifications to meet more usage needs.

[0055] In a specific implementation, the third connection point 40 includes a third coil control terminal connection point 8 and a third load terminal connection point 9. The third coil control terminal connection point 8 and the third load terminal connection point 9 are respectively connected to different terminals of the precharge relay 4 to cooperate with the third printed branch 80 to realize the connection of the precharge circuit.

[0056] In this embodiment, the precharge relay is used as a switch in the precharge circuit to enable the circuit to switch on and off and handle overcurrent.

[0057] In this embodiment, the pre-charge resistor is a power resistor. When the vehicle executes the high-voltage command, it first closes the pre-charge circuit to charge the X capacitor at the electric drive end. At this time, the pre-charge resistor acts as a current-limiting resistor to prevent the pre-charge circuit from being damaged by a large current surge at the moment of power-on.

[0058] In a further embodiment, the board 1 is also provided with a pre-charge circuit positive connection point 15 and a pre-charge circuit negative connection point 16, which are respectively connected to other electrical components of the BDU via wiring harnesses. The pre-charge circuit positive connection point 15 and the pre-charge circuit negative connection point 16 are respectively located at both ends of the length direction of the board 1. The pre-charge relay 4 is located near the pre-charge circuit negative connection point 16, the pre-charge resistor 5 is located near the pre-charge circuit positive connection point 15, and the heating relay 3 is located between the pre-charge relay 4 and the pre-charge resistor 5.

[0059] In a further embodiment, the plate 1 is also provided with a coil control external connection point 14, and the second coil control terminal connection point 6 on the heating circuit is connected to the coil control external connection point 14 through the first printed line; the third coil control terminal connection point 8 on the pre-charge circuit is connected to the coil control external connection point 14 through the second printed line.

[0060] Specifically, the connection points of the third printed branch 80 include a third connection point 40 and a fourth connection point 50, realizing the series connection of the pre-charge relay 4 and the pre-charge resistor 5.

[0061] As an alternative implementation, the circuit structure may include a pre-charge circuit. The printed branches of the pre-charge circuit include at least two third printed branches 80 and at least two fourth printed branches. The connection points of the third printed branches 80 include third connection points 40, and the third connection points 40 of the at least two third printed branches 80 are used to connect pre-charge relays 4 of different specifications. The connection points of the fourth printed branches include fourth connection points 50, and the fourth connection points 50 of the at least two fourth printed branches are used to connect pre-charge resistors 5 of different specifications. The arrangement of the third connection points 40 on the third printed branches 80 and the fourth connection points 50 on the fourth printed branches enables the pre-charge relays 4 and pre-charge resistors 5 to be connected in parallel.

[0062] In one embodiment, at least two of the third connection points 40 are distributed at intervals, and the distance D between any two of the third connection points 40 satisfies 14mm≤D≤21mm.

[0063] The distance D between each pair of the third connection points 40 needs to be adapted to the specifications of the commonly used precharge relays 4. If the distance D between each pair of the third connection points 40 is too large, it will be difficult to solder the terminals of the precharge relays 4 to the third connection points 40 on the board body 1 of the circuit board, which will easily cause poor soldering and reduce the soldering strength and reliability.

[0064] In one specific embodiment, at least two of the third connection points 40 are spaced apart, and the distance D between any two of the third connection points 40 is 14 mm.

[0065] In another specific embodiment, at least two of the third connection points 40 are spaced apart, and the distance D between any two of the third connection points 40 is 21 mm.

[0066] In another specific embodiment, at least two of the third connection points 40 are spaced apart, and the distance D between any two of the third connection points 40 is 18 mm.

[0067] In one embodiment, at least two of the fourth connection points 50 are spaced apart, and the distance E between any two of the fourth connection points 50 satisfies 65mm≤E≤100mm.

[0068] The distance E between each pair of the fourth connection points 50 needs to be adapted to the specifications of the commonly used pre-charge resistor 5. If the distance E between each pair of the fourth connection points 50 is too large, it will be difficult to solder the terminals of the pre-charge resistor 5 to the fourth connection points 50 on the board body 1 of the circuit board, which will easily cause poor soldering and reduce the soldering strength and reliability.

[0069] In one specific embodiment, at least two of the fourth connection points 50 are spaced apart, and the distance E between any two of the fourth connection points 50 is 65 mm.

[0070] In another specific embodiment, at least two of the fourth connection points 50 are spaced apart, and the distance E between any two of the fourth connection points 50 is 100 mm.

[0071] In another specific embodiment, at least two of the fourth connection points 50 are spaced apart, and the distance E between any two of the fourth connection points 50 is 88 mm.

[0072] In a specific implementation, the fourth connection point 50 includes a fourth load end connection point 11, which is located at both ends of the pre-charge resistor 5 and is respectively connected to different terminals of the pre-charge resistor 5 to cooperate with the third printed branch 80 to realize the connection of the pre-charge circuit.

[0073] For a smaller pre-charge resistor 5 (with a power of less than 60W), the distance E between the fourth connection points 50 at both ends of the pre-charge resistor 5 is between 67mm and 71mm; specifically, the distance between the fourth load connection points 11 at both ends of the pre-charge resistor 5 is between 67mm and 71mm, specifically 67mm, 71mm, or 69mm.

[0074] For a larger pre-charge resistor 5 (the power of the pre-charge resistor 5 is greater than or equal to 60W), the distance E between the fourth connection points 50 at both ends of the pre-charge resistor 5 is between 65mm and 100mm; specifically, the distance between the fourth load terminal connection points 11 at both ends of the pre-charge resistor 5 is between 65mm and 100mm; specifically, it can be 65mm, 100mm, or 88mm.

[0075] In one embodiment, the area F of the trace cross-section of the printed branch of the precharge circuit satisfies 1mm². 2 ≤F≤2mm 2 .

[0076] If the cross-sectional area F of the printed branch of the pre-charge circuit is too small, it cannot meet the overcurrent requirements of the pre-charge circuit, leading to severe overheating and potentially burning out the circuit board. If the cross-sectional area F of the printed branch of the pre-charge circuit is too large, it occupies too much space on the board, which is not conducive to routing. In this embodiment, the cross-sectional area F of the printed branch of the pre-charge circuit satisfies 1mm². 2 ≤F≤2mm 2 It can meet the overcurrent requirements of the precharge circuit without taking up too much space on board 1.

[0077] In one specific embodiment, the area F of the printed branch trace of the pre-charge circuit is 1 mm². 2.

[0078] In another specific embodiment, the area F of the printed branch trace of the pre-charge circuit is 2 mm². 2 .

[0079] In another specific embodiment, the area F of the printed branch trace of the pre-charge circuit is 1.5 mm². 2 .

[0080] In one embodiment, the circuit structure includes a heating circuit and a pre-charge circuit. The connection point on the printed branch of the heating circuit is used to connect a heating relay 3, and the connection point on the printed branch of the pre-charge circuit is used to connect a pre-charge relay 4. The distance G between the pre-charge relay 4 and the heating relay 3 satisfies that G≥3mm.

[0081] The distance G between the pre-charge relay 4 and the heating relay 3 is greater than or equal to 3mm, which can ensure a good heat dissipation effect.

[0082] Specifically, the distance G between the pre-charge relay 4 and the heating relay 3 can be 3mm or 4mm.

[0083] In this embodiment, when soldering the circuit board to the electrical components, corresponding connection points can be selected according to the different requirements of the BDU and battery system to solder electrical components such as heating fuses 2, heating relays 3, pre-charge relays 4, and pre-charge resistors 5 of different specifications. Alternatively, when soldering the circuit board to the electrical components, corresponding electrical components can be soldered to all connection points. In actual use, the specifications of electrical components can be selected as needed.

[0084] In this embodiment, the electrical components are integrated on the circuit board, and the circuit connection is achieved through the circuit structure on the circuit board.

[0085] The board 1 has multiple sets of circuit structures, which can connect multiple electrical components through printed branches, reducing the use of wire harnesses, saving assembly space, simplifying the assembly process, avoiding problems such as misinterpretation and missing connections, and facilitating automated production; it also avoids wire harness wear and aging problems. Each set of circuit structures includes at least two printed branches. Although it can connect electrical components of different specifications, integrating them on the circuit board can easily cause heat dissipation problems. In this embodiment, the area A of the trace cross-section of each printed branch satisfies 1mm². 2 ≤A≤2mm 2 While meeting the requirements of the circuit board, it can also maintain spacing, which is conducive to heat dissipation.

[0086] In this embodiment, the battery includes the aforementioned BDU, a housing, and a battery pack. Both the battery pack and the BDU are connected within the housing, and the battery pack is connected to the BDU. The housing has a base plate, and the circuit board is arranged parallel to the base plate.

[0087] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery pack comprising a BDU, the BDU comprising a circuit board; characterized in that, The circuit board includes: plate(1); The circuit structure is arranged on the plate body (1) and has multiple groups, each group of the circuit structure including at least two printed branches, and the area A of the wire cross section of each printed branch satisfies 1mm 2 ≤A≤2mm 2 ; Connection points are provided on the printed branches, and the connection points on at least two of the printed branches of at least one set of the circuit structure are used to connect electrical devices of different specifications.

2. The battery pack of claim 1, wherein, The circuit structure includes a heating circuit, and the printed branches of the heating circuit include at least two first printed branches (10). The connection points of the first printed branches (10) include first connection points (20). The first connection points (20) of the at least two first printed branches (10) are used to connect heating fuses (2) of different specifications.

3. The battery pack of claim 2, wherein, At least two of the first connection points (20) are spaced apart, and the distance between any two of the first connection points (20) is between 38 mm and 40 mm.

4. The battery pack of claim 1, wherein, The circuit structure includes a heating circuit, and the printed branches of the heating circuit include at least two second printed branches (70). The connection points of the second printed branches (70) include second connection points (30). The second connection points (30) of the at least two second printed branches (70) are used to connect heating relays (3) of different specifications.

5. The battery pack of claim 4, wherein, At least two second connection points (30) are distributed at intervals, and the distance B between any two second connection points (30) satisfies 14mm≤B≤21mm.

6. The battery pack of claim 2 or 4, wherein, The area C of the cross section of the printed branch of the heating circuit satisfies, 1 mm 2 ≤ C ≤ 2 mm 2 .

7. The battery pack of claim 2 or 4, wherein, The circuit structure includes a pre-charge circuit, and the printed branches of the pre-charge circuit include at least two third printed branches (80). The connection points of the third printed branches (80) include a third connection point (40) and a fourth connection point (50). The third connection points (40) of the at least two third printed branches (80) are used to connect pre-charge relays (4) of different specifications, and the fourth connection points (50) of the at least two third printed branches (80) are used to connect pre-charge resistors (5) of different specifications.

8. The battery pack of claim 7, wherein, At least two of the third connection points (40) are distributed at intervals, and the distance D between any two of the third connection points (40) satisfies 14mm≤D≤21mm; And / or, at least two of the fourth connection points (50) are spaced apart, and the distance E between any two of the fourth connection points (50) satisfies 65mm≤E≤100mm; And / or, the area F of the cross section of the wire of the printing branch of the pre-charge circuit satisfies, 1mm 2 ≤ F ≤ 2mm 2 .

9. The battery pack of any one of claims 1-5 or 8, wherein, The circuit structure includes a heating circuit and a pre-charge circuit. The connection point on the printed branch of the heating circuit is used to connect the heating relay (3). The connection point on the printed branch of the pre-charge circuit is used to connect the pre-charge relay (4). The distance G between the pre-charge relay (4) and the heating relay (3) satisfies that G≥3mm.

10. The battery pack of any one of claims 1-5 or 8, wherein, It also includes a housing, the housing having a base plate, the BDU being disposed on the housing, and the circuit board being disposed parallel to the base plate.

11. The battery pack of any one of claims 1-5 or 8, wherein, The thickness of each of the at least two printed branches is consistent.

12. The battery pack of claim 2, wherein, The plate (1) is also provided with a positive connection point (12) for the heating circuit and a negative connection point (13) for the heating circuit. The positive connection point (12) and the negative connection point (13) of the heating circuit are spaced apart and located at both ends of the heating fuse (2).

13. The battery pack of claim 7, wherein, The second connection point (30) includes a second coil control terminal connection point (6) and a second load terminal connection point (7). The second coil control terminal connection point (6) and the second load terminal connection point (7) are respectively connected to different terminals of the heating relay (3) to cooperate with the second printed branch (70) to connect the heating circuit.

14. The battery pack of claim 13, wherein, The second coil control terminal connection point (6) is provided at least two at intervals, and the distance between two adjacent second coil control terminal connection points (6) is between 18.7 mm and 20.3 mm.

15. The battery pack of claim 13, wherein, The second load end connection point (7) is provided at least two intervals, and the distance between two adjacent second load end connection points (7) is between 14.9mm and 16.5mm.

16. The battery pack of claim 13, wherein, The third connection point (40) includes a third coil control terminal connection point (8) and a third load terminal connection point (9). The third coil control terminal connection point (8) and the third load terminal connection point (9) are respectively connected to different terminals of the precharge relay (4) to cooperate with the third printed branch (80) to connect the precharge circuit.

17. The battery pack of claim 16, wherein, The plate (1) is also provided with a pre-charge circuit positive connection point (15) and a pre-charge circuit negative connection point (16), which are respectively located at both ends of the plate (1) in the length direction. The precharge relay (4) is located near the negative connection point (16) of the precharge circuit, the precharge resistor (5) is located near the positive connection point (15) of the precharge circuit, and the heating relay (3) is located between the precharge relay (4) and the precharge resistor (5).

18. The battery pack of claim 17, wherein, The plate (1) is also provided with a coil control external connection point (14). The second coil control terminal connection point (6) on the heating circuit is connected to the coil control external connection point (14) through the first printed line. The third coil control terminal connection point (8) on the pre-charge circuit is connected to the coil control external connection point (14) through the second printed line.

19. The battery pack of claim 8, wherein, The fourth connection point (50) includes a fourth load terminal connection point (11), which is located at both ends of the pre-charge resistor (5) and is respectively connected to different terminals of the pre-charge resistor (5) to cooperate with the third printed branch (80) to connect the pre-charge circuit.

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