Line arrangement structure with low branch voltage difference

Abstract

The utility model discloses a line arrangement structure with low branch voltage difference. The line arrangement structure comprises a first branch, a second branch, a third branch and a battery pack, the battery packs of the first branch circuit and the third branch circuit are arranged on the two sides of the battery pack of the second branch circuit in a crossed mode, the battery pack of the second branch circuit is arranged between the first branch circuit and the third branch circuit, and the first branch circuit, the second branch circuit and the third branch circuit form branch circuits with the same wire harness total length. According to the utility model, by adjusting the arrangement position of the battery pack and optimizing the wiring harness connection scheme, the total lengths of the branch wiring harnesses are close, the difference of branch wiring resistance is reduced, and the branch voltage difference caused by the difference of the wiring resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wiring harness line connection, in particular to a line arrangement structure with low branch pressure difference. Background Art

[0002] In order to ensure that each slave device can be accurately identified through the automatic addressing hard line, the layout and wiring of the battery pack in the vehicle have been carefully designed. Taking 6 battery packs divided into 3 branches as an example, the usual wiring method is to correspond the consecutive battery box numbers with the branch connection relationship. Specifically, battery boxes 01 and 02 are classified as one branch, battery boxes 03 and 04 are the second branch, and battery boxes 05 and 06 form the third branch. This layout can significantly reduce the total length of the wiring harness. At the same time, the slave board can use the automatic addressing function to set the address of each slave device.

[0003] However, there is a major problem with the traditional battery system wiring harness connection scheme. Due to the large differences in branch harness lengths, the voltage difference between branches increases, which affects the performance of the entire battery system. The generation of this voltage difference is not only related to the length of the harness, but also to the physical location and number of battery packs in the branch.

[0004] The defects of the prior art are mainly manifested in the wiring harness connection design of the battery system. In the current wiring harness connection design, there is a pressure difference problem caused by wire resistance between the branches. The existence of this pressure difference not only increases the risk of the battery system reporting a pressure difference failure, but also has an adverse effect on the normal operating performance of the battery system. Specifically, when there is a large pressure difference caused by wire resistance between the branches in the battery system, the system may misjudge it as a fault, thereby causing a pressure difference reporting failure. This misjudgment not only affects the stability of the battery system, but may also have a negative impact on the life of the battery. Therefore, it is necessary to further improve and perfect the wiring harness connection design of the battery system in view of the deficiencies in the prior art, so as to solve the pressure difference problem caused by wire resistance, reduce the possibility of pressure difference reporting failure, and improve the operating performance and stability of the battery system. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art. To achieve the above purpose, a line arrangement structure with low branch pressure difference is adopted to solve the problems raised in the above background technology.

[0006] A circuit arrangement structure with low branch voltage difference comprises a first branch, a second branch, a third branch, and a battery pack;

[0007] The battery packs of the first branch and the third branch are cross-arranged on both sides of the battery pack of the second branch, the battery pack of the second branch is arranged between the first branch and the third branch, and the first branch, the second branch, and the third branch form branches with the same total wiring harness length.

[0008] As a further solution of the utility model: the battery pack includes a first battery box and a second battery box connected to the first branch, a third battery box and a fourth battery box connected to the second branch, and a fifth battery box and a sixth battery box connected to the third branch.

[0009] As a further solution of the utility model: the first branch includes a first positive output wiring harness connected to the positive pole of the first battery box, a first inter-box series line connected between the first battery box and the second battery box, and a first negative output wiring harness connected to the negative pole of the second battery box.

[0010] As a further solution of the utility model: the second branch includes a second positive output wiring harness connected to the positive pole of the third battery box, a second inter-box series line connected between the third battery box and the fourth battery box, and a second negative output wiring harness connected to the negative pole of the fourth battery box.

[0011] As a further solution of the utility model: the third branch includes a third positive output wiring harness connected to the positive pole of the fifth battery box, a third inter-box series line connected between the fifth battery box and the sixth battery box, and a third negative output wiring harness connected to the negative pole of the sixth battery box.

[0012] As a further solution of the present invention: the maximum voltage difference between the first branch, the second branch, and the third branch ranges from 30 mV to 40 mV.

[0013] As a further solution of the utility model: the first branch, the second branch, and the third branch are all 50mm 2 Copper wire.

[0014] As a further solution of the present invention: the overall length of the wiring harness of the first branch, the second branch, and the third branch ranges from 10m to 11m.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] By adopting the above technical solution, by reasonably adjusting the arrangement position of the battery pack, the total length of each branch wiring harness can be made as close as possible, thereby reducing the difference in wiring harness length. This adjustment can significantly reduce the voltage difference caused by the difference in wiring harness length.

[0017] Secondly, optimizing the wiring harness connection scheme can redesign the layout and connection method of the wiring harness to more effectively reduce the difference in branch line resistance. The branch voltage difference caused by the difference in line resistance can be further reduced by improving the direction of the wiring harness, increasing the diameter of the wiring harness, or selecting materials with lower impedance.

[0018] It can significantly improve the performance of the battery system and improve its stability and reliability. By reducing the branch pressure difference, it can ensure that the battery system operates more efficiently and prolong its service life. In addition, these optimization measures can also simplify the design and production process of the battery system, reduce costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings:

[0020] Figure 1 A schematic diagram of the circuit arrangement structure of an embodiment disclosed in the present application;

[0021] Figure 2 It is a schematic diagram of the overall structure of the circuit arrangement structure of the embodiment disclosed in this application;

[0022] Figure 3 It is a schematic diagram of the detailed structure of branches of the line arrangement structure of the embodiment disclosed in this application.

[0023] In the figure: 1. First branch; 11. First battery box; 12. Second battery box; 13. First positive output harness; 14. First inter-box series wire; 15. First negative output harness; 2. Second branch; 21. Third battery box; 22. Fourth battery box; 23. Second positive output harness; 24. Second inter-box series wire; 25. Second negative output harness; 3. Third branch; 31. Fifth battery box; 32. Sixth battery box; 33. Third positive output harness; 34. Third inter-box series wire; 35. Third negative output harness; 4. Battery pack. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Please refer to Figure 1 In an embodiment of the utility model, a circuit arrangement structure with a low branch pressure difference includes a first branch 1, a second branch 2, a third branch 3, and a battery pack 4;

[0026] In this embodiment, the position of the battery box in the same branch is adjusted in combination with the arrangement positions of the six battery boxes, thereby optimizing the connection relationship of the three branch line harnesses;

[0027] Specifically, Figure 2 As shown, the figure is a schematic diagram of the overall structure; the first branch 1 and the battery pack 4 of the third branch 3 are cross-arranged on both sides of the battery pack 4 of the second branch 2, and the battery pack 4 of the second branch 2 is arranged between the first branch 1 and the third branch 3, and the first branch 1, the second branch 2, and the third branch 3 form branches with the same total length of the wiring harness.

[0028] In this embodiment, the maximum voltage difference between the first branch 1, the second branch 2, and the third branch 3 is in the range of 30mV to 40mV, and all adopt 50mm 2 Copper conductors. The overall length of the harness ranges from 10m to 11m.

[0029] like Figure 3 As shown, the figure is a detailed structural diagram of the branch of the line layout structure;

[0030] In this embodiment, the battery pack 4 includes a first battery box 11 and a second battery box 12 connected to the first branch 1, a third battery box 21 and a fourth battery box 22 connected to the second branch 2, and a fifth battery box 31 and a sixth battery box 32 connected to the third branch 3.

[0031] In this embodiment, the first branch 1 includes a first positive output harness 13 connected to the positive electrode of the first battery box 11, a first inter-box series line 14 connected between the first battery box 11 and the second battery box 12, and a first negative output harness 15 connected to the negative electrode of the second battery box 12. Specifically, the overall length of the harness is 10.093m. At a current of 400A, the voltage drop of the first branch 1 caused by the line resistance is 1437mV.

[0032] In this embodiment, the second branch 2 includes a second positive output harness 23 connected to the positive electrode of the third battery box 21, a second inter-box series line 24 connected between the third battery box 21 and the fourth battery box 22, and a second negative output harness 25 connected to the negative electrode of the fourth battery box 22. Specifically, the overall length of the harness is 10.363m. At a current of 400A, the voltage drop of the second branch 2 caused by the line resistance is 1475mV.

[0033] In this embodiment, the third branch 3 includes a third positive output wiring harness 33 connected to the positive pole of the fifth battery box 31, a third inter-box series line 34 connected between the fifth battery box 31 and the sixth battery box 32, and a third negative output wiring harness 35 connected to the negative pole of the sixth battery box 32. Specifically, the overall length of the wiring harness is 10.184m. At a current of 400A, the voltage drop of the third branch 3 caused by the line resistance is 1450mV.

[0034] The above wiring harness connection scheme is shown in the following table:

[0035]

[0036] Note: The branch connection wire is 50mm2 copper wire, and the resistivity is 0.0192Q.mm" / m (@50℃)

[0037] The above wiring harness connection scheme can reduce the maximum voltage difference between the three branches (such as between the first branch 1 and the second branch 2) to 38mV, which reduces the branch voltage difference by 601mV compared with the original connection scheme, effectively reducing the voltage difference problem caused by the wiring harness connection between branches.

[0038] Changing the conventional battery system wiring harness connection method to ensure that the length of the connection harness for each branch is basically the same and the wire resistance difference between branches is reduced can effectively reduce the voltage difference between branches.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A line arrangement structure with low branch pressure difference, characterized in that: It comprises a first branch (1), a second branch (2), a third branch (3), and a battery pack (4); The battery packs of the first branch and the third branch are cross-arranged on both sides of the battery pack of the second branch, the battery pack of the second branch is arranged between the first branch and the third branch, and the first branch, the second branch, and the third branch form branches with the same total wiring harness length.

2. A line arrangement structure with low branch pressure difference according to claim 1, characterized in that: The battery pack comprises a first battery box (11) and a second battery box (12) connected to a first branch, a third battery box (21) and a fourth battery box (22) connected to the second branch, and a fifth battery box (31) and a sixth battery box (32) connected to the third branch.

3. A line arrangement structure with low branch pressure difference according to claim 2, characterized in that: The first branch includes a first positive output wiring harness (13) connected to the positive electrode of the first battery box, a first inter-box series line (14) connected between the first battery box and the second battery box, and a first negative output wiring harness (15) connected to the negative electrode of the second battery box.

4. The circuit arrangement structure with low branch pressure difference according to claim 2, characterized in that: The second branch includes a second positive output wiring harness (23) connected to the positive electrode of the third battery box, a second inter-box series line (24) connected between the third battery box and the fourth battery box, and a second negative output wiring harness (25) connected to the negative electrode of the fourth battery box.

5. The circuit arrangement structure with low branch pressure difference according to claim 2, characterized in that: The third branch includes a third positive output wiring harness (33) connected to the positive electrode of the fifth battery box, a third inter-box series line (34) connected between the fifth battery box and the sixth battery box, and a third negative output wiring harness (35) connected to the negative electrode of the sixth battery box.

6. A line arrangement structure with low branch pressure difference according to any one of claims 1 to 5, characterized in that: The maximum voltage difference between the first branch, the second branch, and the third branch ranges from 30 mV to 40 mV.

7. A line arrangement structure with low branch pressure difference according to claim 6, characterized in that: The first branch, the second branch, and the third branch all use 50mm 2 Copper wire.

8. A line arrangement structure with low branch pressure difference according to claim 7, characterized in that: The overall length of the wiring harness of the first branch, the second branch, and the third branch ranges from 10 m to 11 m.

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