Battery Pack

Abstract

The present invention relates to the technical field of BDU, and discloses a battery pack. The circuit board comprises a board body, a loop structure and a connection point. The loop structure is arranged on the board body and has a plurality of groups. Each group of loop structures comprises at least two printed branches. The area A of the wiring cross section of each printed branch meets the requirement of 1 mm 2 ≤A≤2mm 2 The connection points are arranged on the printed branches, and the connection points on at least two printed branches of each loop structure are used to connect electrical components of different specifications. The circuit board provided by the present invention can realize the connection between multiple electrical components through the printed branches, reduce the use of wire harnesses, save assembly space, simplify the assembly process, avoid the occurrence of undesirable problems such as misinterpretation and missing connection, and facilitate the realization of automated production; avoid the wear and aging of the wire harness.

Description

Technical Field

[0001] The present invention relates to the technical field of BDU, and in particular to a battery pack. Background Art

[0002] BDU (battery drive unit), the internal electrical components are usually connected by wiring harnesses and copper busbars; there are a large number of wiring harnesses inside, which are complicated and cumbersome to assemble, and it is very easy to have wrong connection and missed connection problems, making it difficult to achieve automated production; in addition, the wiring harnesses are prone to wear and aging problems. Summary of the invention

[0003] In view of this, the present invention provides a battery pack to solve the problem that there are a large number of wiring harnesses inside the BDU, which are complicated and cumbersome to assemble, and are prone to wrong connection and missing connection.

[0004] The present invention provides a circuit board, comprising:

[0005] plate body;

[0006] The loop structure is arranged on the plate body and has a plurality of groups, each group of the loop structure includes at least two printed branches, and the area A of the wiring cross section of each printed branch meets the requirement of 1mm 2 ≤A≤2 mm 2 ;

[0007] The connection points are arranged on the printed branches, and the connection points on at least two printed branches of each group of the loop structure are used to connect electrical devices of different specifications.

[0008] Beneficial effects: Multiple sets of loop structures are provided on the board, and multiple electrical components can be connected through printed branches, which reduces the use of wire harnesses, saves assembly space, simplifies the assembly process, avoids problems such as misunderstanding and missing connections, and facilitates automated production; avoids wear and aging of the wire harness. Each set of loop structures includes at least two printed branches. Although they can connect electrical components of different specifications, they are prone to heat dissipation problems after being integrated on the circuit board. In this embodiment, the area A of the wiring cross section of each printed branch meets the requirement of 1mm 2 ≤A≤2 mm 2 ; While meeting the requirements of the circuit board, it can also maintain the spacing, which is conducive to heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A schematic diagram of a BDU from one viewing angle according to an embodiment of the present invention;

[0011] Figure 2 is a schematic diagram of another viewing angle of a BDU according to an embodiment of the present invention;

[0012] Figure 3 An exploded view of a BDU according to an embodiment of the present invention;

[0013] Figure 4 The figure is a schematic diagram of a circuit board of a BDU according to an embodiment of the present invention.

[0014] Description of reference numerals:

[0015] 1. Board; 2. Heating fuse; 3. Heating relay; 4. Pre-charging relay; 5. Pre-charging 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-charging circuit positive connection point; 16. Pre-charging 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 printed branch; 70. Second printed branch; 80. Third printed branch. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0017] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0018] According to an embodiment of the present invention, on the one hand, a circuit board is provided, comprising a board body 1, a loop structure and a connection point; the loop structure is arranged on the board body 1, and has a plurality of groups, each group of the loop structure comprises at least two printed branches, and the area A of the wiring cross section of each printed branch meets the requirement of 1mm 2 ≤A≤2 mm 2 The connection points are arranged on the printed branches, and the connection points on at least two printed branches of each group of the loop structure are used to connect electrical devices of different specifications.

[0019] The board 1 is provided with multiple sets of loop structures, which can realize the connection between multiple electrical components through printed branches, reduce the use of wire harnesses, save assembly space, simplify the assembly process, avoid the occurrence of misunderstandings, missed connections and other undesirable problems, and facilitate the realization of automated production; avoid the wear and aging of the wire harness. Each set of the loop structure includes at least two printed branches. Although they can connect electrical components of different specifications, they are prone to heat dissipation problems after being integrated on the circuit board. In this embodiment, the area A of the wiring cross section of each printed branch meets the requirements of 1mm 2 ≤A≤2 mm 2 ; While meeting the requirements of the circuit board, it can also maintain the spacing, which is conducive to heat dissipation.

[0020] Specifically, in this embodiment, the plurality of loop structures are at least two loop structures, that is, greater than or equal to two. The printed branch circuit is a printed circuit on the board body of the circuit board in this embodiment.

[0021] In a specific embodiment, the area A of the wiring cross section of each printed branch is 1 mm 2 .

[0022] Specifically, in another embodiment, the area A of the wiring cross section of each printed branch is 2 mm 2 .

[0023] Specifically, in another embodiment, the area A of the cross section of each printed branch is 1.5 mm 2 .

[0024] like Figure 4 As shown in FIG. 1 , the thickness of the printed branch is consistent. Therefore, the area of ​​the wiring cross section of the printed branch mainly depends on the area occupied by the printed branch on the board. The wiring cross section of the printed branch is Figure 4 The cross section is perpendicular to the length of the plate, so Figure 4 The routing cross section of the printed branch is mainly reflected in the space occupied by the printed branch in the width direction of the board. Figure 4 Each rectangular frame 60 may represent an area that can be covered on the board after different electrical components are connected.

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

[0026] The first connection points 20 of at least two of the first printed branches 10 are used to connect heating fuses 2 of different specifications, so as to form heating circuits of different specifications to meet more usage requirements.

[0027] As a convertible embodiment, the heating fuses 2 may be provided with the same size, and the corresponding first printed branches 10 and first connection points 20 may be provided in only one group on the heating circuit.

[0028] Specifically, a fuse is a device that breaks the current by melting one or several proportional specially designed fuses when the current exceeds the specified value for a long enough time, thereby disconnecting the circuit to which it is connected.

[0029] In this embodiment, the function of the heating fuse is as follows: when an abnormal short circuit occurs in the heating circuit, the internal fuse of the heating fuse quickly melts in a short period of time due to instantaneous heat accumulation, thereby disconnecting the heating circuit and protecting other electrical components, circuits and batteries in the heating circuit from damage.

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

[0031] The distance between each two of the first connection points 20 is between 38 mm and 40 mm, which is adapted to the specifications of the commonly used heating fuse 2. Too large a spacing is not conducive to the welding of the terminals of the heating fuse 2 and the first connection points 20 of the circuit board, which is prone to cause cold soldering and reduce the welding strength and reliability.

[0032] In a specific embodiment, at least two of the first connection points 20 are spaced apart from each other, and the distance between every two of the first connection points 20 is 38 mm.

[0033] Specifically, in another embodiment, at least two of the first connection points 20 are spaced apart from each other, and the distance between every two of the first connection points 20 is 39 mm.

[0034] Specifically, in another embodiment, at least two of the first connection points 20 are spaced apart from each other, and the distance between every two of the first connection points 20 is 40 mm.

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

[0036] The second connection points 30 of at least two of the second printing branches 70 are used to connect heating relays 3 of different specifications, so as to form heating circuits of different specifications and meet more usage requirements.

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

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

[0039] In a further embodiment, a heating circuit positive connection point 12 and a heating circuit negative connection point 13 are further provided on the board body 1, and the heating circuit positive connection point 12 and the heating circuit negative connection point 13 are respectively connected to other electrical components of the BDU through a wiring harness. The heating circuit positive connection point 12 and the heating circuit negative connection point 13 are arranged at intervals and are located at both ends of the heating fuse 2.

[0040] In one embodiment, at least two of the second connection points 30 are spaced apart from each other, and a distance B between every two of the second connection points 30 satisfies 14 mm ≤ B ≤ 21 mm.

[0041] The distance B between every two of the second connection points 30 satisfies 14mm≤B≤21mm. This spacing B is adapted to the specifications of the commonly used heating relay 3. Too large a spacing is not conducive to the welding of the terminals of the heating relay 3 and the second connection points 30 of the circuit board, and it is easy to cause cold soldering, and the welding strength and reliability will be reduced.

[0042] In a specific embodiment, at least two of the second connection points 30 are spaced apart from each other, and a distance B between every two of the second connection points 30 is 14 mm.

[0043] In another specific embodiment, at least two of the second connection points 30 are spaced apart from each other, and a distance B between every two of the second connection points 30 is 21 mm.

[0044] In another specific embodiment, at least two of the second connection points 30 are spaced apart from each other, and a distance B between every two of the second connection points 30 is 17 mm.

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

[0046] In a further embodiment, there are at least two second coil control end connection points 6 that are spaced apart from each other, and the distance between every two second coil control end connection points 6 is between 18.7 mm and 20.3 mm.

[0047] In yet another embodiment, there are at least two second load-end connection points 7 that are spaced apart from each other, and the distance between every two second load-end connection points 7 is between 14.9 mm and 16.5 mm.

[0048] In one embodiment, the cross-sectional area C of the printed branch of the heating loop satisfies: 1 mm 2 ≤C≤2 mm 2 .

[0049] If the cross-sectional area C of the printed branch of the heating circuit is too small, it cannot meet the overcurrent requirement of the heating circuit, resulting in severe heating 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 more space on the board 1, which is not conducive to wiring. In this embodiment, the cross-sectional area C of the printed branch of the heating circuit meets the requirement of 1mm 2 ≤C≤2 mm 2 , which can meet the flow requirement of the heating circuit without taking up too much space of the plate body 1.

[0050] In a specific embodiment, the area C of the wiring cross section of the printed branch of the heating loop is 1 mm 2 .

[0051] In another specific embodiment, the area C of the wiring cross section of the printed branch of the heating loop is 2 mm 2 .

[0052] In another specific embodiment, the area C of the wiring cross section of the printed branch of the heating loop is 1.5 mm 2 .

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

[0054] The third connection points 40 of at least two of the third printed branches 80 are used to connect pre-charging relays 4 of different specifications, and the fourth connection points 50 of at least two of the third printed branches 80 are used to connect pre-charging resistors 5 of different specifications, thereby forming pre-charging circuits of different specifications to meet more usage requirements.

[0055] In a specific implementation, the third connection point 40 includes a third coil control end connection point 8 and a third load end connection point 9, and the third coil control end connection point 8 and the third load end connection point 9 are respectively connected to different terminals of the pre-charging relay 4 to cooperate with the third printed branch 80 to achieve connectivity of the pre-charging circuit.

[0056] In this embodiment, the pre-charging relay is a relay applied to the pre-charging circuit as a switch of the pre-charging circuit to realize the on / off and overcurrent of the pre-charging circuit.

[0057] In this embodiment, the pre-charging resistor is a power resistor. When the vehicle executes a high-voltage power command, the pre-charging circuit is first closed to charge the X capacitor at the electric drive end. At this time, the pre-charging resistor acts as a current limiting resistor to prevent the pre-charging circuit from being impacted by a large current at the moment of power-on, thereby preventing the electrical components, circuits and batteries on the pre-charging circuit from being damaged.

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

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

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

[0061] As a convertible implementation, the circuit structure may include a pre-charging circuit, the printed branch of the pre-charging circuit includes at least two third printed branches 80 and at least two fourth printed branches, the connection points of the third printed branches 80 include a third connection point 40, and the third connection points 40 of at least two third printed branches 80 are used to connect pre-charging relays 4 of different specifications; the connection points of the fourth printed branch include and a fourth connection point 50, and the fourth connection points 50 of at least two fourth printed branches are used to connect pre-charging resistors 5 of different specifications. The setting of the third connection point 40 on the third printed branch 80 and the setting of the fourth connection point 50 on the fourth printed branch realize the parallel connection of the pre-charging relay 4 and the pre-charging resistor 5.

[0062] In one embodiment, at least two of the third connection points 40 are spaced apart from each other, and a distance D between every two of the third connection points 40 satisfies 14 mm ≤ D ≤ 21 mm.

[0063] The distance D between each two of the third connection points 40 needs to be adapted to the specifications of the commonly used pre-charging relay 4. If the distance D between each two of the third connection points 40 is too large, it will be detrimental to the welding between the terminals of the pre-charging relay 4 and the third connection points 40 on the board body 1 of the circuit board, and will easily cause cold solder joints, resulting in reduced welding strength and reliability.

[0064] In a specific embodiment, at least two of the third connection points 40 are spaced apart from each other, and a distance D between every 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 from each other, and a distance D between every 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 from each other, and a distance D between every 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 from each other, and a distance E between every two of the fourth connection points 50 satisfies 65 mm ≤ E ≤ 100 mm.

[0068] The distance E between each two of the fourth connection points 50 needs to be adapted to the specifications of the commonly used pre-charging resistor 5. If the distance E between each two of the fourth connection points 50 is too large, it will be detrimental to the welding between the terminal of the pre-charging resistor 5 and the fourth connection point 50 on the board body 1 of the circuit board, and it will easily cause cold solder joints, resulting in reduced welding strength and reliability.

[0069] In a specific embodiment, at least two of the fourth connection points 50 are spaced apart from each other, and a distance E between every 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 from each other, and a distance E between every 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 from each other, and a distance E between every 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 disposed at both ends of the pre-charging resistor 5 and respectively connected to different terminals of the pre-charging resistor 5 to cooperate with the third printed branch 80 to achieve connectivity of the pre-charging circuit.

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

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

[0075] In one embodiment, the area F of the wiring cross section of the printed branch of the pre-filling loop satisfies, 1mm 2 ≤F≤2mm 2 .

[0076] If the area F of the printed branch of the pre-filling circuit is too small, it cannot meet the overcurrent requirement of the pre-filling circuit, resulting in severe heat generation and burning of the circuit board; if the area F of the printed branch of the pre-filling circuit is too large, it will occupy more space on the board 1, which is not conducive to wiring. In this embodiment, the area F of the printed branch of the pre-filling circuit meets the requirements of 1mm2 ≤F≤2 mm 2 It can meet the overcurrent requirement of the pre-charging circuit without occupying too much space of the board body 1.

[0077] In a specific embodiment, the area F of the wiring cross section of the printed branch of the pre-filling loop is 1 mm 2 .

[0078] In another specific embodiment, the area F of the wiring cross section of the printed branch of the pre-filling loop is 2 mm 2 .

[0079] In another specific embodiment, the area F of the wiring cross section of the printed branch of the pre-filling loop is 1.5 mm 2 .

[0080] In one embodiment, the circuit structure includes a heating circuit and a pre-charging 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-charging circuit is used to connect the pre-charging relay 4, and the distance G between the pre-charging relay 4 and the heating relay 3 satisfies, G≥3mm.

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

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

[0083] In this embodiment, when the circuit board and the electrical components are welded, corresponding connection points can be selected according to different requirements of the BDU and the battery system to weld electrical components of different specifications such as the heating fuse 2, the heating relay 3, the pre-charging relay 4 and the pre-charging resistor 5. When the circuit board and the electrical components are welded, corresponding electrical components can be welded on all connection points. In actual use, the specification of the electrical components can be selected according to the needs.

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

[0085] The board 1 is provided with multiple sets of loop structures, which can realize the connection between multiple electrical components through printed branches, reduce the use of wire harnesses, save assembly space, simplify the assembly process, avoid the occurrence of misunderstandings, missed connections and other undesirable problems, and facilitate the realization of automated production; avoid the wear and aging of the wire harness. Each set of the loop structure includes at least two printed branches. Although they can connect electrical components of different specifications, they are prone to heat dissipation problems after being integrated on the circuit board. In this embodiment, the area A of the wiring cross section of each printed branch meets the requirements of 1mm 2 ≤A≤2 mm 2 ; While meeting the requirements of the circuit board, it can also maintain the spacing, which is conducive to heat dissipation.

[0086] In this embodiment, the battery includes the above-mentioned BDU, a housing and a battery pack, the battery pack and the BDU are both connected in the housing, and the battery pack is connected to the BDU. The housing is provided with a bottom plate, and the circuit board is arranged parallel to the bottom plate.

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

Claims

1. A battery pack, comprising a BDU, wherein the BDU comprises a circuit board; characterized in that: The circuit board comprises: Plate(1); A loop structure is arranged on the plate body (1) and has a plurality of groups, each group of the loop structure comprises at least two printed branches, and the area A of the wiring cross section of each printed branch satisfies: 1 mm 2 ≤A≤2 mm 2 ; A connection point is arranged on the printed branch, and the connection points on at least two printed branches of at least one group of the loop structure are used to connect electrical components of different specifications; The circuit structure comprises a heating circuit, the printed branch of the heating circuit comprises at least two second printed branches (70), the connection points of the second printed branches (70) comprise a second connection point (30), and the second connection points (30) of at least two of the second printed branches (70) are used to connect heating relays (3) of different specifications; at least two of the second connection points (30) are spaced apart, and a distance B between every two of the second connection points (30) satisfies 14 mm ≤ B ≤ 21 mm; the second connection points (30) comprise a second coil control terminal connection point (6) and a second negative terminal connection point (70). The load-end connection point (7), the second coil control-end connection point (6) and the second load-end connection point (7) are respectively connected to different terminals of the heating relay (3) to cooperate with the second printed branch (70) to achieve connectivity of the heating circuit; the second coil control-end connection point (6) has at least two spaced-apart connections, and the distance between each two second coil control-end connection points (6) is between 18.7 mm and 20.3 mm; the second load-end connection point (7) has at least two spaced-apart connections, and the distance between each two second load-end connection points (7) is between 14.9 mm and 16.5 mm; The circuit structure comprises a pre-charging circuit, wherein the printed branch of the pre-charging circuit comprises at least two third printed branches (80), the connection points of the third printed branches (80) comprise a third connection point (40) and a fourth connection point (50), the third connection points (40) of at least two of the third printed branches (80) are used to connect pre-charging relays (4) of different specifications, and the fourth connection points (50) of at least two of the third printed branches (80) are used to connect pre-charging resistors (5) of different specifications; at least two of the third connection points (40) are distributed at intervals, and the distance D between each two of the third connection points (40) satisfies 14 mm ≤ D ≤ 21 mm; at least two of the fourth connection points (50) are distributed at intervals, and the distance E between each two of the fourth connection points (50) satisfies 65 mm ≤ E ≤ 100 mm; the area F of the wiring cross section of the printed branch of the pre-charging circuit satisfies 1 mm 2 ≤F≤2 mm 2 , the heating relay (3) is arranged between the pre-charging relay (4) and the pre-charging resistor (5).

2. The battery pack according to claim 1, characterized in that: The loop structure comprises a heating loop, the printed branch of the heating loop comprises at least two first printed branches (10), the connection points of the first printed branches (10) comprise a first connection point (20), and the first connection points (20) of at least two of the first printed branches (10) are used to connect heating fuses (2) of different specifications.

3. The battery pack according to claim 2, characterized in that: At least two of the first connection points (20) are spaced apart, and the distance between each two of the first connection points (20) is between 38 mm and 40 mm.

4. The battery pack according to claim 2, characterized in that: The cross-sectional area C of the printed branch of the heating circuit satisfies, 1mm 2 ≤C≤2 mm 2 .

5. The battery pack according to any one of claims 1 to 4, characterized in that: The circuit structure comprises a heating circuit and a pre-charging circuit, the connection point on the printing branch of the heating circuit is used to connect a heating relay (3), the connection point on the printing branch of the pre-charging circuit is used to connect a pre-charging relay (4), and the spacing G between the pre-charging relay (4) and the heating relay (3) satisfies G≥3mm.

6. The battery pack according to any one of claims 1 to 4, characterized in that: It also includes a shell, the shell is provided with a bottom plate, the BDU is arranged on the shell, and the circuit board is arranged parallel to the bottom plate.

Images