Low-voltage large-current copper bar connecting structure

Abstract

The utility model provides a low-voltage large-current copper bar connecting structure. The low-voltage large-current copper bar connecting structure comprises a cabinet body, a plurality of battery units, a first copper bar assembly and a second copper bar assembly, the plurality of battery units are stacked in the cabinet body from top to bottom; the first copper bar assembly and the second copper bar assembly are arranged on one side in the cabinet body; the end, close to the top of the cabinet body, of the first copper bar assembly penetrates through the top of the cabinet body and then is fixed to the outer side face of the top of the cabinet body. The end, close to the top of the cabinet body, of the second copper bar assembly penetrates through the top of the cabinet body and then is fixed to the outer side face of the top of the cabinet body. The first copper bar assembly is connected with the first pole of each battery unit, and the second copper bar assembly is connected with the second pole of each battery unit. The low-voltage large-current copper bar connection mode is achieved, bias current is small, the size is small, safety and reliability are achieved, external wiring is convenient, the load current can reach 2400A, and installation and maintenance are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a low voltage large current copper bar connecting structure. BACKGROUND

[0002] The busbar cabinet is an important part of the energy storage system, and its main function is to interact with the AC side and the DC side. The charging and discharging of the energy storage system is carried out through the busbar cabinet. Specifically, the power lines of the cluster management box are collected into the busbar cabinet, the busbar cabinet is connected with the UPS, and the UPS is connected to the external power supply or load. The energy storage system can exchange energy with the outside world through the above path.

[0003] When the number of battery clusters increases, the number of power line bundles of the cluster management box also increases, and the weight becomes heavier, which increases the stress on the wiring points in the busbar cabinet. Under the working condition of transportation vibration, the connection of the wire bundle is prone to looseness or even falling off. In serious cases, the loose or falling wire bundle may touch other metals and cause short circuit, resulting in burning of the equipment and failure of the function of the energy storage system, so that normal charging and discharging cannot be carried out. Moreover, the connection mode of the existing low-voltage large-current product has the defects of large bias current, complex connection, large space occupation, and increased cost of the whole cabinet. SUMMARY

[0004] Therefore, the utility model embodiment provides a low-voltage large-current copper bar connecting structure, which aims to solve the problems of the existing low-voltage large-current product connection mode, such as large bias current, complex connection, large space occupation, and increased cost of the whole cabinet.

[0005] To achieve the above-mentioned purpose, the utility model embodiment provides a low-voltage large-current copper bar connecting structure, which comprises a cabinet body, a plurality of battery units, a first copper bar assembly and a second copper bar assembly. The plurality of battery units are stacked from top to bottom in the cabinet body. The first copper bar assembly and the second copper bar assembly are arranged on one side of the cabinet body. One end of the first copper bar assembly near the top of the cabinet body penetrates through the top of the cabinet body and is fixed to the outer side of the top of the cabinet body. One end of the second copper bar assembly near the top of the cabinet body penetrates through the top of the cabinet body and is fixed to the outer side of the top of the cabinet body. The first copper bar assembly is connected with the first pole of each battery unit, and the second copper bar assembly is connected with the second pole of each battery unit.

[0006] As a preferred embodiment, the first copper bar assembly and the second copper bar assembly are arranged in parallel and symmetrically, and a first gap is arranged between the first copper bar assembly and the second copper bar assembly.

[0007] In a preferred embodiment, both the first copper busbar assembly and the second copper busbar assembly are disposed between the cabinet and the battery unit; a second gap is provided between the first copper busbar assembly and the cabinet, and between the second copper busbar assembly and the cabinet;

[0008] A third gap is provided between the first copper busbar assembly and the battery cell, as well as between the second copper busbar assembly and the battery cell.

[0009] In a preferred embodiment, the first copper busbar assembly includes a first copper busbar, a second copper busbar, a third copper busbar, and a fourth copper busbar; one end of the first copper busbar is fixed to the top of the cabinet, and the other end is connected to the second copper busbar and the third copper busbar respectively; the end of the second copper busbar away from the first copper busbar is fixed to the third copper busbar; the end of the third copper busbar away from the first copper busbar is connected to the fourth copper busbar; the second copper busbar, the third copper busbar, and the fourth copper busbar are respectively connected to the first pole of the corresponding battery unit.

[0010] In a preferred embodiment, the end of the first copper busbar away from the top of the cabinet is located between the second copper busbar and the third copper busbar.

[0011] In a preferred embodiment, the second copper busbar, the third copper busbar, and the fourth copper busbar are respectively connected to the first pole of the corresponding battery unit via a first connecting line; the third copper busbar and the fourth copper busbar are respectively fixedly connected to a corresponding fixing frame inside the cabinet.

[0012] In a preferred embodiment, the first copper busbar is an L-shaped copper busbar; the third copper busbar and the fourth copper busbar are both strip-shaped copper busbars.

[0013] In a preferred embodiment, the second copper busbar is a bent copper busbar, comprising an integrally formed first connecting portion, a first bent portion, and a first straight portion; the first connecting portion is vertically disposed on one side of the first bent portion, the first straight portion is vertically disposed on the other side of the first bent portion, and the first connecting portion and the first straight portion extend in opposite directions; the first connecting portion is connected to the first copper busbar, and the end of the first straight portion away from the first bent portion is fixed to the third copper busbar; a fourth gap is provided between the first straight portion and the third copper busbar.

[0014] In a preferred embodiment, the second copper busbar assembly includes a fifth copper busbar, a sixth copper busbar, a seventh copper busbar, and an eighth copper busbar; one end of the fifth copper busbar is fixed to the top of the cabinet, and the other end is connected to the sixth copper busbar and the seventh copper busbar respectively; the end of the sixth copper busbar away from the fifth copper busbar is fixed to the seventh copper busbar; the end of the seventh copper busbar away from the fifth copper busbar is connected to the eighth copper busbar; the sixth copper busbar, the seventh copper busbar, and the eighth copper busbar are respectively connected to the second pole of the corresponding battery unit.

[0015] In a preferred embodiment, the end of the fifth copper busbar furthest from the top of the cabinet is positioned between the sixth and seventh copper busbars.

[0016] In a preferred embodiment, the sixth copper busbar, the seventh copper busbar, and the eighth copper busbar are respectively connected to the second pole of the corresponding battery unit via a second connecting line; the seventh copper busbar and the eighth copper busbar are respectively fixedly connected to a corresponding fixing frame inside the cabinet.

[0017] In a preferred embodiment, the fifth copper busbar is an L-shaped copper busbar; the seventh and eighth copper busbars are both strip-shaped copper busbars.

[0018] In a preferred embodiment, the sixth copper busbar is a bent copper busbar, comprising an integrally formed second connecting portion, a second bent portion, and a second straight portion; the second connecting portion is perpendicularly disposed on one side of the second bent portion, and the second straight portion is perpendicularly disposed on the other side of the second bent portion, with the second connecting portion and the second straight portion extending in opposite directions; the second connecting portion is connected to the fifth copper busbar, and the end of the second straight portion away from the second bent portion is fixed to the seventh copper busbar; a fifth gap is provided between the second straight portion and the seventh copper busbar.

[0019] In a preferred embodiment, the first copper busbar and the fifth copper busbar are symmetrically arranged; the second copper busbar and the sixth copper busbar are symmetrically arranged; the third copper busbar and the seventh copper busbar are symmetrically arranged; and the fourth copper busbar and the eighth copper busbar are symmetrically arranged.

[0020] In a preferred embodiment, an "L"-shaped PC sheet is provided on the side of the sixth copper busbar away from the first copper busbar assembly, the side of the seventh copper busbar away from the first copper busbar assembly, and the side of the eighth copper busbar away from the first copper busbar assembly.

[0021] In a preferred embodiment, the first copper busbar assembly is a positive copper busbar assembly, and the second copper busbar assembly is a negative copper busbar assembly; the first electrode is the positive electrode, and the second electrode is the negative electrode.

[0022] Compared to existing technologies, the structure of this application has the following technical advantages: This structure enables a rational layout of various electrical components within the cabinet, optimizing the cabinet's design. While improving the overall aesthetics and convenience of the cabinet, it reduces its size and footprint, meeting the requirements of space-constrained environments. Simultaneously, it effectively enhances the safety and reliability of the cabinet during use. By connecting the positive and negative terminals of the battery unit to the first copper busbar assembly (positive copper busbar) and the second copper busbar assembly (negative copper busbar) respectively, this application achieves a low-voltage, high-current copper busbar connection method. It features low bias current, small size, safety and reliability, and convenient external wiring. The load current can reach 2400A. It allows for a rational layout of the copper busbars, enabling reasonable cable distribution, effectively optimizing wiring space, and facilitating installation and maintenance. Furthermore, this structure effectively improves the heat dissipation of each copper busbar and fuse, facilitating the installation and maintenance of various components within the combiner cabinet. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the low-voltage, high-current copper busbar connection structure according to an embodiment of the present invention (with the cabinet cover in the open state);

[0025] Figure 2 for Figure 1 A schematic diagram of the internal structure of a low-voltage, high-current copper busbar connection structure;

[0026] Figure 3 for Figure 1 The structural diagrams of the first copper busbar assembly and the second copper busbar assembly are shown.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Specifically, such as Figures 1 to 3As shown, one embodiment of this utility model provides a low-voltage, high-current copper busbar connection structure, including a cabinet 10, several battery units 20, a first copper busbar assembly 30, and a second copper busbar assembly 40; the several battery units 20 are stacked from top to bottom inside the cabinet 10; the first copper busbar assembly 30 and the second copper busbar assembly 40 are both disposed on one side inside the cabinet 10; one end of the first copper busbar assembly 30 near the top of the cabinet 10 passes through the top of the cabinet 10 and is fixed to the outer side of the top of the cabinet 10; one end of the second copper busbar assembly 40 near the top of the cabinet 10 passes through the top of the cabinet 10 and is fixed to the outer side of the top of the cabinet 10; the first copper busbar assembly 30 is connected to the first electrode 21 of each battery unit 20, and the second copper busbar assembly 40 is connected to the second electrode 22 of each battery unit 20.

[0034] This application achieves a low-voltage, high-current copper busbar connection method by connecting the positive and negative terminals of the battery cells to the first copper busbar assembly (positive copper busbar) and the second copper busbar assembly (negative copper busbar), respectively. This method features low bias current, small size, safety, reliability, and convenient external wiring, with a load current reaching 2400A. Both the first and second copper busbar assemblies employ multi-segment copper busbar connections, allowing the battery cells on the cabinet to be connected via different segmented copper busbars. This effectively prevents excessive bias current accumulation at either the top or bottom of the cabinet, keeping the bias current within a controllable range.

[0035] In a preferred embodiment, the first copper busbar assembly 30 and the second copper busbar assembly 40 are arranged parallel to each other and symmetrically, with a first gap (not shown in the figure) between them. This arrangement allows for a reasonable layout of the copper busbars, achieving a rational distribution of cables, effectively optimizing cabling space, facilitating installation and maintenance, and simultaneously improving the heat dissipation of each copper busbar.

[0036] In a preferred embodiment, both the first copper busbar assembly 30 and the second copper busbar assembly 40 are disposed between the cabinet 10 and the battery unit 20; a second gap (not marked in the figure) is provided between the first copper busbar assembly 30 and the cabinet 10 and between the second copper busbar assembly 40 and the cabinet 10.

[0037] A third gap (not shown in the figure) is provided between the first copper busbar assembly 30 and the battery unit 20, and between the second copper busbar assembly 40 and the battery unit 20. This arrangement allows for a reasonable layout of the copper busbars, achieving a reasonable distribution of cables, effectively optimizing wiring space, facilitating installation and maintenance, and simultaneously improving the heat dissipation of each copper busbar and fuse, thus facilitating the installation and maintenance of various components within the combiner cabinet.

[0038] In a preferred embodiment, the first copper busbar assembly 30 includes a first copper busbar 31, a second copper busbar 32, a third copper busbar 33, and a fourth copper busbar 34; one end of the first copper busbar 31 is fixed to the top of the cabinet 10, and the other end is connected to the second copper busbar 32 and the third copper busbar 33 respectively; the end of the second copper busbar 32 away from the first copper busbar 31 is fixed to the third copper busbar 33; the end of the third copper busbar 33 away from the first copper busbar 31 is connected to the fourth copper busbar 34; the second copper busbar 32, the third copper busbar 33, and the fourth copper busbar 34 are respectively connected to the first pole 21 of the battery unit 20 that is adapted to it (i.e., located on the same horizontal line).

[0039] In this embodiment, the first copper busbar assembly is composed of multiple copper busbars connected together, realizing a low-voltage, high-current copper busbar connection method. It has the characteristics of small bias current, small size, safety and reliability, and convenient external wiring. It can reasonably arrange the copper busbars, realize the reasonable distribution of cables, effectively optimize the wiring space, and is convenient for installation and maintenance.

[0040] In a preferred embodiment, the end of the first copper busbar 31 away from the top of the cabinet 10 is located between the second copper busbar 32 and the third copper busbar 33.

[0041] In a preferred embodiment, the second copper busbar 32, the third copper busbar 33, and the fourth copper busbar 34 are respectively connected to the first pole 21 of the battery unit 20 through the first connecting line 50; the third copper busbar 33 and the fourth copper busbar 34 are respectively fixedly connected to the corresponding fixing frame inside the cabinet 10.

[0042] In a preferred embodiment, the first copper busbar 31 is an L-shaped copper busbar; the third copper busbar 33 and the fourth copper busbar 34 are both strip-shaped copper busbars. This arrangement allows for a reasonable layout of the copper busbars, achieving a rational distribution of cables, effectively optimizing cabling space, facilitating installation and maintenance, and simultaneously improving the heat dissipation of each copper busbar.

[0043] As a preferred embodiment, such as Figure 3As shown, the second copper busbar 32 is a bent copper busbar, including an integrally formed first connecting portion 321, a first bent portion 322, and a first straight portion 323. The first connecting portion 321 is vertically disposed on one side of the first bent portion 322, and the first straight portion 323 is vertically disposed on the other side of the first bent portion 322, with the first connecting portion 321 and the first straight portion 323 extending in opposite directions. The first connecting portion 321 is connected to the first copper busbar 31, and the end of the first straight portion 323 away from the first bent portion 322 is fixed to the third copper busbar 33. A fourth gap is provided between the first straight portion 323 and the third copper busbar 33. This design facilitates connection, saves connection space, provides good connection stability, and is aesthetically pleasing and neat. Simultaneously, it effectively improves the problem of insufficient cable space affecting the electrical performance of the busbar cabinet and effectively enhances the heat dissipation of each copper busbar.

[0044] In a preferred embodiment, the second copper busbar assembly 40 includes a fifth copper busbar 41, a sixth copper busbar 42, a seventh copper busbar 43, and an eighth copper busbar 44; one end of the fifth copper busbar 41 is fixed to the top of the cabinet 10, and the other end is connected to the sixth copper busbar 42 and the seventh copper busbar 43 respectively; the end of the sixth copper busbar 42 away from the fifth copper busbar 41 is fixed to the seventh copper busbar 43; the end of the seventh copper busbar 43 away from the fifth copper busbar 41 is connected to the eighth copper busbar 44; the sixth copper busbar 42, the seventh copper busbar 43, and the eighth copper busbar 44 are respectively connected to the second pole 22 of the battery unit 20 that are adapted to each other (i.e., located on the same horizontal line).

[0045] In this embodiment, the second copper busbar assembly is composed of multiple copper busbars connected together, realizing a low-voltage, high-current copper busbar connection method. It has the characteristics of small bias current, small size, safety and reliability, and convenient external wiring. It can reasonably arrange the copper busbars, realize the reasonable distribution of cables, effectively optimize the wiring space, and is convenient for installation and maintenance.

[0046] In a preferred embodiment, the end of the fifth copper busbar 41 away from the top of the cabinet 10 is located between the sixth copper busbar 42 and the seventh copper busbar 43.

[0047] In a preferred embodiment, the sixth copper busbar 42, the seventh copper busbar 43, and the eighth copper busbar 44 are respectively connected to the second pole 22 of the battery unit 20 through the second connecting line 60; the seventh copper busbar 43 and the eighth copper busbar 44 are respectively fixedly connected to the corresponding fixing frame inside the cabinet 10.

[0048] In a preferred embodiment, the fifth copper busbar 41 is an L-shaped copper busbar; the seventh copper busbar 43 and the eighth copper busbar 44 are both strip-shaped copper busbars.

[0049] As a preferred embodiment, such as Figure 3 As shown, the sixth copper busbar 42 is a bent copper busbar, including an integrally formed second connecting part 421, a second bent part 422, and a second straight part 423. The second connecting part 421 is vertically disposed on one side of the second bent part 422, and the second straight part 423 is vertically disposed on the other side of the second bent part 422, with the second connecting part 421 and the second straight part 423 extending in opposite directions. The second connecting part 421 is connected to the fifth copper busbar 41, and the end of the second straight part 423 away from the second bent part 422 is fixed to the seventh copper busbar 43. A fifth gap is provided between the second straight part 423 and the seventh copper busbar 43. This design facilitates connection, saves connection space, provides good connection stability, and is aesthetically pleasing and neat. Simultaneously, it effectively improves the problem of insufficient cable space affecting the electrical performance of the busbar cabinet and effectively enhances the heat dissipation of each copper busbar.

[0050] In a preferred embodiment, the first copper busbar 31 and the fifth copper busbar 41 are symmetrically arranged; the second copper busbar 32 and the sixth copper busbar 42 are symmetrically arranged; the third copper busbar 33 and the seventh copper busbar 43 are symmetrically arranged; and the fourth copper busbar 34 and the eighth copper busbar 44 are symmetrically arranged. This arrangement allows for a rational layout of the copper busbars, achieving a reasonable distribution of cables, effectively optimizing cabling space, reducing the size of the cabinet, minimizing floor space, and meeting the requirements of space-constrained environments.

[0051] In a preferred embodiment, an "L"-shaped PC sheet 70 is provided on the side of the sixth copper busbar 42 away from the first copper busbar assembly 30, the side of the seventh copper busbar 43 away from the first copper busbar assembly 30, and the side of the eighth copper busbar 44 away from the first copper busbar assembly 30. This effectively ensures the insulation and stability of the connection between each copper busbar and the battery unit.

[0052] In a preferred embodiment of this application, the first copper busbar assembly 30 is a positive copper busbar assembly, and the second copper busbar assembly 40 is a negative copper busbar assembly; the first electrode 21 is a positive electrode, and the second electrode 22 is a negative electrode.

[0053] It is understood that in other embodiments, the first copper busbar assembly 30 is a negative copper busbar assembly, and the second copper busbar assembly 40 is a positive copper busbar assembly; the first electrode 21 is a negative electrode, and the second electrode 22 is a positive electrode.

[0054] The structure of this application is applicable to combiner cabinets. Through this structure, the various electrical components inside the cabinet can be rationally arranged, the cabinet can be optimized, and the overall aesthetics and convenience of the cabinet can be improved. At the same time, the size of the cabinet is reduced, the footprint is reduced, and the usage requirements of space-constrained places are met. Meanwhile, the safety and reliability of the cabinet during use are effectively enhanced.

[0055] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A low-voltage, high-current copper busbar connection structure, characterized in that, The device includes a cabinet, several battery cells, a first copper busbar assembly, and a second copper busbar assembly. The battery cells are stacked from top to bottom inside the cabinet. Both the first and second copper busbar assemblies are located on one side of the cabinet. One end of the first copper busbar assembly near the top of the cabinet passes through the top of the cabinet and is fixed to the outer surface of the top of the cabinet. One end of the second copper busbar assembly near the top of the cabinet passes through the top of the cabinet and is fixed to the outer surface of the top of the cabinet. The first copper busbar assembly is connected to the first terminal of each battery cell, and the second copper busbar assembly is connected to the second terminal of each battery cell.

2. The low-voltage, high-current copper busbar connection structure according to claim 1, characterized in that, The first copper busbar assembly and the second copper busbar assembly are arranged parallel to each other and symmetrically, and a first gap is provided between the first copper busbar assembly and the second copper busbar assembly.

3. The low-voltage, high-current copper busbar connection structure according to claim 1, characterized in that, Both the first copper busbar assembly and the second copper busbar assembly are disposed between the cabinet and the battery unit; a second gap is provided between the first copper busbar assembly and the cabinet, and between the second copper busbar assembly and the cabinet; A third gap is provided between the first copper busbar assembly and the battery cell, as well as between the second copper busbar assembly and the battery cell.

4. The low-voltage, high-current copper busbar connection structure according to claim 1, characterized in that, The first copper busbar assembly includes a first copper busbar, a second copper busbar, a third copper busbar, and a fourth copper busbar; one end of the first copper busbar is fixed to the top of the cabinet, and the other end is connected to the second copper busbar and the third copper busbar respectively; the end of the second copper busbar away from the first copper busbar is fixed to the third copper busbar; the end of the third copper busbar away from the first copper busbar is connected to the fourth copper busbar; the second copper busbar, the third copper busbar, and the fourth copper busbar are respectively connected to the first pole of the corresponding battery unit.

5. The low-voltage, high-current copper busbar connection structure according to claim 4, characterized in that, The end of the first copper busbar furthest from the top of the cabinet is positioned between the second and third copper busbars; The second copper busbar, the third copper busbar, and the fourth copper busbar are respectively connected to the first pole of the corresponding battery unit via a first connecting line; the third copper busbar and the fourth copper busbar are respectively fixedly connected to the corresponding fixing frame inside the cabinet. The first copper busbar is an "L"-shaped copper busbar; the third copper busbar and the fourth copper busbar are both strip-shaped copper busbars.

6. The low-voltage, high-current copper busbar connection structure according to claim 4, characterized in that, The second copper busbar is a bent copper busbar, comprising an integrally formed first connecting portion, a first bent portion, and a first straight portion; the first connecting portion is vertically disposed on one side of the first bent portion, the first straight portion is vertically disposed on the other side of the first bent portion, and the first connecting portion and the first straight portion extend in opposite directions; the first connecting portion is connected to the first copper busbar, and the end of the first straight portion away from the first bent portion is fixed to the third copper busbar; a fourth gap is provided between the first straight portion and the third copper busbar.

7. The low-voltage, high-current copper busbar connection structure according to claim 4, characterized in that, The second copper busbar assembly includes a fifth copper busbar, a sixth copper busbar, a seventh copper busbar, and an eighth copper busbar; one end of the fifth copper busbar is fixed to the top of the cabinet, and the other end is connected to the sixth copper busbar and the seventh copper busbar respectively; the end of the sixth copper busbar away from the fifth copper busbar is fixed to the seventh copper busbar; the end of the seventh copper busbar away from the fifth copper busbar is connected to the eighth copper busbar; the sixth copper busbar, the seventh copper busbar, and the eighth copper busbar are respectively connected to the second pole of the corresponding battery unit.

8. The low-voltage, high-current copper busbar connection structure according to claim 7, characterized in that, The fifth copper busbar is located between the sixth and seventh copper busbars at one end away from the top of the cabinet. The sixth copper busbar, the seventh copper busbar, and the eighth copper busbar are respectively connected to the second pole of the corresponding battery unit via a second connecting line; the seventh copper busbar and the eighth copper busbar are respectively fixedly connected to the corresponding fixing frame inside the cabinet. The fifth copper busbar is an "L"-shaped copper busbar; the seventh and eighth copper busbars are both strip-shaped copper busbars; The sixth copper busbar is a bent copper busbar, comprising an integrally formed second connecting portion, a second bent portion, and a second straight portion; the second connecting portion is perpendicularly disposed on one side of the second bent portion, and the second straight portion is perpendicularly disposed on the other side of the second bent portion, with the second connecting portion and the second straight portion extending in opposite directions; the second connecting portion is connected to the fifth copper busbar, and the end of the second straight portion away from the second bent portion is fixed to the seventh copper busbar; a fifth gap is provided between the second straight portion and the seventh copper busbar.

9. The low-voltage, high-current copper busbar connection structure according to claim 7, characterized in that, The first copper busbar and the fifth copper busbar are symmetrically arranged; the second copper busbar and the sixth copper busbar are symmetrically arranged; the third copper busbar and the seventh copper busbar are symmetrically arranged; the fourth copper busbar and the eighth copper busbar are symmetrically arranged.

10. The low-voltage, high-current copper busbar connection structure according to claim 7, characterized in that, The sixth copper busbar is provided with an "L"-shaped PC sheet on the side away from the first copper busbar assembly, the seventh copper busbar is provided with an "L"-shaped PC sheet on the side away from the first copper busbar assembly, and the eighth copper busbar is provided with an "L"-shaped PC sheet on the side away from the first copper busbar assembly. The first copper busbar assembly is a positive electrode copper busbar assembly, and the second copper busbar assembly is a negative electrode copper busbar assembly; the first electrode is the positive electrode, and the second electrode is the negative electrode.

Images