Fixing buckle of confluence terminal and battery cell confluence assembly
By designing a spaced-out mounting section and isolation groove structure, the creepage problem of existing fixing clips under high voltage is solved, achieving efficient anti-creep performance and compact space utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-04-03
AI Technical Summary
Existing fixing clips are difficult to effectively prevent creepage in high-voltage applications, and increasing the width of the separator to enhance the barrier effect will reduce the space utilization of the battery pack.
A fixing clip for a bus terminal is designed, which uses two spaced mounting parts to form a mounting groove and an isolation groove. The creepage distance is increased by using a clamp and an isolation groove, and the anti-creep performance is further enhanced by setting notches and baffles on the extension plate.
It effectively avoids creepage and improves space utilization, making the assembly of fixing clips, bus terminals and battery cells more compact.
Smart Images
Figure CN224082641U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a fixing clip for a bus terminal and a battery cell bus assembly. Background Technology
[0002] In lithium battery applications, multiple individual cells are typically connected in series or parallel via bus terminals to form a battery pack for use in devices. The battery pack contains multiple bus terminals, which are secured together using clips. (Refer to...) Figure 1 As shown, a conventional fixing clip 1' includes at least two sets of clamping plate assemblies and a partition 12'. The partition 12' is disposed between two adjacent bus terminals 2' to separate them and prevent creepage. The thickness direction (X direction in the figure) of the partition 12' is the same as the arrangement direction of the two adjacent bus terminals 2'. The two sets of clamping plate assemblies are respectively disposed on both sides of the thickness direction of the partition 12' and are used to fix the ends 21' of the two bus terminals 2' respectively. Specifically, the two clamping plates 11' in each set of clamping plate assemblies clamp the ends 21' of the corresponding bus terminals 2'.
[0003] The existing fixing clip 1' has the following shortcomings: Since this structure mainly uses the partition 12' to prevent creepage, the partition 12' is difficult to effectively prevent creepage in high-voltage applications. If the width of the partition 12' is increased to achieve the creepage prevention effect, the overall external contour of the fixing clip 1' needs to be increased, reducing the overall space utilization of the battery pack. Utility Model Content
[0004] The purpose of this invention is to provide a fixing clip for a bus terminal and a battery cell bus assembly, which has high space utilization and good anti-creep performance.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A fixing clip for a bus terminal is provided, comprising two mounting portions for mounting two adjacent bus terminals respectively. The two mounting portions are spaced apart along the arrangement direction of the two adjacent bus terminals. Each mounting portion includes an end plate and two clamping plates spaced apart on the end plate. The end plate and the two clamping plates form a mounting groove for inserting the bus terminal. The groove opening of one mounting portion is opposite to the groove opening of the other mounting portion. A connecting plate is provided between the end plates of one mounting portion and the end plates of the other mounting portion. The connecting plate and the two end plates form an isolation groove.
[0007] Furthermore, the two clamping plates are spaced apart along a first direction, and at least one end of the end plate along the first direction protrudes from the side of the corresponding clamping plate away from the mounting groove.
[0008] Furthermore, in the same mounting part, the two clamping plates are a first clamping plate and a second clamping plate, one end of the end plate protrudes from the side of the first clamping plate away from the mounting groove, the second clamping plate is connected to the end of the end plate away from the first clamping plate, and one end of the second clamping plate extends toward the centerline of the isolation groove.
[0009] Furthermore, the connecting plate is disposed at a non-end end of the end plate, such that the two sides of the connecting plate in the thickness direction respectively form the isolation groove between the two end plates.
[0010] Furthermore, an extension plate is provided inside the isolation groove. The extension plate is perpendicular to the depth direction of the isolation groove. The extension plate has a notch that can separate the two ends of the extension plate along the arrangement direction of two adjacent bus terminals.
[0011] Furthermore, the isolation groove is provided with a plurality of the expansion plates, which are spaced apart along the depth direction of the isolation groove.
[0012] Furthermore, the width of the notch is greater than or equal to 1 mm.
[0013] Furthermore, the expansion plate has notches at both opposite ends.
[0014] Furthermore, a baffle is provided between the two clamping plates, and the baffle forms one of the side walls of the mounting groove.
[0015] Furthermore, the free end of the clamp is provided with a guide slope for inserting the bus terminal.
[0016] A battery cell busbar assembly is also provided, including a fixing clip for the busbar terminals and at least two busbar terminals, wherein the opposite ends of two adjacent busbar terminals are respectively inserted into two mounting slots on the fixing clip.
[0017] Furthermore, the bus terminal is interference-fitted with the mounting groove, with an interference amount δ = 0.05-0.1 mm.
[0018] The beneficial effects of this utility model are as follows: By setting two spaced-apart mounting portions and forming mounting grooves on the mounting portions, and by setting an isolation groove between the two mounting portions, it is advantageous to increase the creepage distance between two adjacent bus terminals by utilizing the outer wall of the mounting groove and the isolation groove. When adjacent bus terminals are blocked by a clamp and an isolation groove, current needs to flow through the groove walls of the clamp and the isolation groove to conduct to each other, i.e., creepage occurs. In this embodiment, the fixing buckle, under the action of the clamp and the isolation groove, helps to increase the creepage distance between two adjacent bus terminals, effectively avoiding creepage. Furthermore, the distribution of the clamp and the isolation groove is along the arrangement direction of the bus terminals, which avoids increasing the component size in the thickness direction of the bus terminals, making the assembly of the entire fixing buckle, bus terminals, and battery cell more compact and improving the overall space utilization. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of a fastener in the prior art.
[0020] Figure 2 This is a schematic diagram of a battery cell busbar assembly according to an embodiment of the present invention.
[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0022] Figure 4 This is a schematic diagram from a first-view perspective of the fixing clip of the bus terminal according to an embodiment of the present utility model.
[0023] Figure 5 This is a schematic diagram from a second perspective of the fixing clip of the bus terminal according to an embodiment of the present utility model.
[0024] Figure 6 This is a third-view schematic diagram of the fixing clip of the bus terminal according to an embodiment of the present utility model.
[0025] Figure 7 This is a schematic diagram from a fourth perspective of the fixing buckle of the bus terminal according to an embodiment of the present utility model.
[0026] Figure 8 This is a partial schematic diagram of the fixing buckle of the bus terminal according to another embodiment of the present invention.
[0027] Figure 1 middle:
[0028] 1′, Fixing buckle; 11′, Clamping plate; 12′, Partition plate; 2′, Bus terminal; 21′, End.
[0029] Figures 2 to 7 middle:
[0030] 1. Mounting section; 10. End plate; 11. Clamping plate; 11a. First clamping plate; 111. Limiting section; 11b. Second clamping plate; 112. Guide slope; 13. Baffle; 14. Mounting groove; 15. Clearance area; 2. Connecting plate; 3. Extension plate; 31. Notch; 4. Isolation groove; 5. Bus terminal. Detailed Implementation
[0031] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0032] like Figures 2 to 7 As shown, this utility model provides a fixing clip for a bus terminal (hereinafter referred to as a fixing clip), used to fix two adjacent bus terminals 5. The bus terminal 5, also known as an aluminum bus or copper bus, is used to connect multiple cells in a battery pack. The fixing clip includes two mounting parts 1 and a connecting plate 2. The two mounting parts 1 are respectively used to mount two adjacent bus terminals 5, and the two mounting parts 1 are connected and fixed together by the connecting plate 2, so that the mounting parts 1 and the connecting plate 2 form an integral structure for mounting and fixing the bus terminals 5. The two mounting parts 1 are spaced apart along the arrangement direction of the two adjacent bus terminals 5 (X direction in the figure). The mounting part 1 includes an end plate 10 and two clamping plates 11, which are respectively a first clamping plate 11a and a second clamping plate 11b, which are spaced apart on the end plate 10 along the Z direction in the figure. The end plate 10 and the two clamping plates 11 form a mounting groove 14 for inserting the end of the bus terminal 5. The entire fixing clip has two mounting slots 14. During installation, the fixing clip is located between two adjacent bus terminals 5, with the opening of the mounting slot 14 of one mounting part 1 facing away from the opening of the mounting slot 14 of the other mounting part 1, and the openings of the two mounting slots 14 facing the two adjacent bus terminals 5 respectively. The connecting plate 2 is disposed between the two mounting parts 1, and the opposite ends of the connecting plate 2 are respectively connected to the end plates 10 of the two mounting parts 1, forming an isolation groove 4 between the connecting plate 2 and the two end plates 10.
[0033] It is understood that by providing two spaced-apart mounting portions 1 and forming mounting grooves 14 on the mounting portions 1, and by providing an isolation groove 4 between the two mounting portions 1, it is advantageous to increase the creepage distance between two adjacent bus terminals 5 by utilizing the outer wall of the mounting groove 14 and the isolation groove 4. Since there is a barrier between two adjacent bus terminals 5, the current needs to flow through the groove walls of the clamp and the isolation groove 4 to conduct to each other, i.e., creepage occurs. In this embodiment, the fixing buckle, under the action of the clamp and the isolation groove 4, helps to increase the creepage distance between two adjacent bus terminals 5, effectively preventing creepage. Furthermore, the distribution of the clamp 11 and the isolation groove 4 is arranged along the arrangement direction of the bus terminals 5, which avoids increasing the component size in the thickness direction of the bus terminals 5 (Z direction in the figure), making the assembly of the entire fixing buckle, bus terminals, and battery cells more compact and improving the overall space utilization.
[0034] In an alternative embodiment, refer to Figure 4 As shown, two clamping plates 11 are parallel and spaced apart along a first direction (Z direction in the diagram). The first direction is perpendicular to the arrangement direction of two adjacent bus terminals 5. Along the first direction, at least one end of the end plate 10 protrudes from the side of the corresponding clamping plate away from the mounting groove 14. Specifically, when the end of the bus terminal 5 is inserted into the mounting groove 14, the first clamping plate 11a is located at the top of the bus terminal 5, and the second clamping plate 11b is located at the bottom of the bus terminal 5. The top end of the end plate 10 protrudes from the side of the first clamping plate 11a away from the mounting groove 14. It can be understood that when creepage occurs on the side of the first clamping plate 11a away from the mounting groove 14, the current needs to pass through the end area of the end plate 10 protruding from the first clamping plate 11a. This structure helps to increase the creepage distance of the upper surface of the fixing buckle and avoid creepage. Of course, in some embodiments, the two ends of the end plate 10 along the first direction can protrude from the first clamping plate 11a and the second clamping plate 11b respectively to increase the creepage distance of the upper and lower surfaces of the fixing buckle. Alternatively, one end of the end plate 10 along the first direction can protrude beyond the second clamping plate 11b to increase the creepage distance of the lower surface of the fixing buckle. In specific applications, the appropriate option can be chosen flexibly based on the actual spatial structure of the battery pack.
[0035] It should be noted that, for the sake of providing a detailed explanation of the structure of the fixing buckle, the fixing buckle described in this embodiment is based on... Figure 4 The state shown is the baseline, that is, two adjacent bus terminals are arranged in the horizontal direction, and the first clamping plate 11a and the second clamping plate 11b are arranged in the vertical direction.
[0036] In an alternative embodiment, refer to Figure 4 and Figure 6As shown, the first clamping plate 11a and the second clamping plate 11b are spaced apart on the end plate 10 along a first direction. One end of the end plate 10 corresponding to the first clamping plate 11a protrudes from the side of the first clamping plate 11a away from the mounting groove 14, thereby increasing the creepage distance of the upper surface of the fixing buckle. The second clamping plate 11b is connected to the end of the end plate 10 away from the first clamping plate 11a, and one end of the second clamping plate 11b extends towards the centerline of the isolation groove 4. Alternatively, the end of the end plate 10 corresponding to the second clamping plate 11b is connected to the non-end of the second clamping plate 11b, causing one end of the second clamping plate 11b to protrude from the groove wall of the isolation groove 4. This structure ensures that the current on the lower surface of the fixing buckle must pass through the lower surface of the second clamping plate 11b, the end of the second clamping plate 11b protruding from the isolation groove 4, and the groove wall of the isolation groove 4 to conduct. Therefore, this structure helps to increase the creepage distance of the lower surface of the isolation buckle. In some applications, due to the spatial constraints of the battery pack, the lower surface of the fixing clip needs to be flatter because it is close to the battery cell. Therefore, to increase the creepage distance of the fixing clip, one end of the end plate 10 can protrude from the first clamping plate 11a, and the other end of the end plate 10 can be connected to the non-end of the second clamping plate 11b, with one end of the second clamping plate 11b extending towards the centerline of the isolation groove 4.
[0037] In an alternative embodiment, refer to Figure 6 As shown, two end plates 10 are spaced apart along a first direction, and a connecting plate 2 is disposed between the two end plates 10. The two ends of the connecting plate 2 are respectively connected to the non-ends of the two end plates 10, so that the two opposite sides of the connecting plate 2 (i.e., Figure 6 The upper and lower sides (shown) form isolation grooves 4 between the two end plates 10. It is understood that by placing the connecting plate 2 at a non-end position on the end plate 10, isolation grooves 4 can be formed both above and below the connecting plate 2. When the upper surface of the fixing buckle creeps, the current needs to pass through the groove wall of the upper isolation groove 4; when the lower surface of the fixing buckle creeps, the current needs to pass through the groove wall of the lower isolation groove 4. Therefore, this structure helps to increase the creepage distance between the upper and lower surfaces of the fixing buckle.
[0038] In an alternative embodiment, refer to Figure 4 , Figure 6 and Figure 7As shown, an extension plate 3 is provided inside the isolation groove 4. The extension plate 3 is perpendicular to the depth direction of the isolation groove 4, that is, the extension plate 3 is horizontally arranged. A notch 31 is provided on the extension plate 3, which can separate the two ends of the extension plate 3 along the arrangement direction of two adjacent bus terminals 5. It can also be understood that the notch 31 is a long groove penetrating the thickness direction (Z direction in the figure) of the extension plate 3 on opposite sides, and the length of the notch 31 extends along the Y direction in the figure, so that the notch 31 can separate the corresponding areas of the two ends of the extension plate 3 along the X direction in the figure. This structure requires the current in the corresponding area to pass through the notch 31 of the extension plate 3 and then through the groove wall of the isolation groove 4 before creepage occurs, which is beneficial to further improve the creepage distance of the corresponding area. In some application scenarios, in order to adapt to the spatial structure of the battery pack, the length of the second clamping plate 11b is less than the length of the end plate 10, and a clearance area 15 is formed between one end of the second clamping plate 11b and the end plate 10. Since the current on the bus terminal 5 in the clearance area 15 can flow directly to the isolation groove 4 through the lower end of the end plate 10, the creepage distance of the lower surface of the second clamping plate 11b is missing. Therefore, by setting the extension plate 3 and setting the notch 31 at the corresponding position in the clearance area 15, the creepage distance reduced due to the absence of the second clamping plate 11b can be compensated, so as to ensure the anti-creep performance of the fixing buckle.
[0039] Specifically, the expansion plate 3 has notches 31 at both ends along the Y direction shown in the figure. It is understood that because the two clamping plates are positioned on both sides of the bus terminal 5 in the thickness direction, the ends of the bus terminal in the width direction (Y direction shown in the figure) will directly extend past the end plate 10 for creepage. Therefore, by providing notches 31 at both ends of the expansion plate 3 in the width direction (Y direction shown in the figure), the creepage distance in this area is increased, ensuring the anti-creep performance of the fixing clip. Furthermore, by providing notches 31 at opposite ends of the expansion plate 3, the entire expansion plate 3 is prevented from being partially separated. This structure allows the expansion plate 3 to also serve to connect and fix the two mounting parts 1, improving the overall structural strength of the fixing clip.
[0040] Specifically, the width of the notch 31 is B, where B ≥ 1 mm. It is understood that the width of the notch 31 is designed to be greater than 1 mm to prevent current from directly breaking down the air and flowing along the lower surface of the expansion plate 3 in high-voltage applications. Therefore, by designing the width of the notch 31 to be greater than 1 mm, current must pass through the notch 31 and enter the area between the connecting plate 2 and the expansion plate 3 to achieve creepage, thereby ensuring the anti-creep performance of the fixing clip. In this embodiment, the value of the width B of the notch 31 includes, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm.
[0041] Specifically, in high-voltage applications, to further improve the anti-creep performance of the fixing clips, multiple extension plates 3 can be installed within the isolation groove 4, with the extension plates 3 spaced apart along the depth direction of the isolation groove 4. Since the current needs to pass through the gaps 31 of the multiple extension plates 3 sequentially during creepage, this helps to increase the creepage distance in the corresponding area.
[0042] In an alternative embodiment, refer to Figure 4 and Figure 7 As shown, a baffle 13 is provided between the two clamping plates 11, forming one side wall of the mounting groove 14. Alternatively, the end plate 10, the first clamping plate 11a, the second clamping plate 11b, and the baffle 13 together form the mounting groove 14 for inserting the bus terminal 5. By providing the baffle 13, the current in the end region of the bus terminal 5 in the width direction must pass through the baffle 13 before flowing into the isolation groove 4, thereby increasing the creepage distance in the corresponding region. In practical applications, the baffle 13 can be provided according to the specific spatial structure of the fixing clip; that is, there can be one baffle 13 located at one end of the clamping plate 11; or there can be two baffles 13 located at opposite ends of the clamping plate 11.
[0043] Specifically, refer to Figure 5 As shown, the mounting part 1 includes an end plate 10, a first clamping plate 11a, a second clamping plate 11b, and a baffle 13. The end plate 10, the two clamping plates, and the baffle 13 form a mounting groove 14 for inserting the bus terminal 5. In this structure, the two clamping plates restrict the thickness of the bus terminal 5 on both sides. The baffle 13 restricts one end of the bus terminal 5 in the width direction. The first clamping plate 11a has a limiting part 111 on the side facing the mounting groove 14, so that the bus terminal 5 can be clamped between the baffle 13 and the limiting part 111, thus limiting the width of the bus terminal 5.
[0044] In another embodiment, reference is made to Figure 8As shown, the free end of the clamping plate 11 is provided with a guide slope 112 for inserting the busbar terminal 5. Alternatively, it can be understood that the guide slope 112 is provided at the opening of the mounting groove 14 to facilitate the insertion of the busbar terminal 5 into the mounting groove 14 along the guide slope 113. Specifically, the length of the guide slope 112 is L, where L = 1.5-2 mm. In this embodiment, the length L of the guide slope 112 includes, but is not limited to, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, and 2 mm. The angle γ of the guide slope 112 is 15-30°. The angle γ of the guide slope 112 includes, but is not limited to, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, and 30°. It should be noted that the guide slope 112 is existing technology in the field of machining, and its specific location and orientation will not be described here. In this embodiment, both clamping plates 11 in the same mounting part 1 are provided with guide slopes 112. Of course, in other embodiments, guide slopes 112 may be provided only on the first clamping plate 11a or the second clamping plate 11b.
[0045] like Figure 2 and Figure 3 As shown, this embodiment also provides a cell busbar assembly for connecting multiple cells within a battery pack, i.e., multiple cells are connected in series or parallel through the cell busbar assembly. The busbar terminals are used for electrical connection to the terminals on the cells. The cell busbar assembly includes a fixing clip and at least two busbar terminals 5. The fixing clip is installed between two adjacent busbar terminals 5. The fixing clip has two mounting slots 14 with opposite orientations, and the ends of the busbar terminals 5 are inserted into the corresponding mounting slots 14 to achieve installation and fixation of the busbar terminals 5. By forming an isolation groove 4 between the two mounting portions 1, the creepage distance between the two busbar terminals 5 is increased, thereby ensuring the anti-creep performance of the entire cell busbar assembly.
[0046] Specifically, to improve the installation stability between the bus terminal 5 and the fixing clip, the bus terminal 5 and the mounting groove 14 on the mounting part 1 are interference-fitted, with an interference amount δ = 0.05-0.1mm. In this embodiment, the value range of the interference amount δ includes, but is not limited to, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm and 0.1mm.
[0047] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A fixing clip for a bus terminal, characterized in that, The device includes two mounting portions (1) for mounting two adjacent bus terminals (5), which are spaced apart along the arrangement direction of the two adjacent bus terminals (5). Each mounting portion (1) includes an end plate (10) and two clamping plates (11) spaced apart on the end plate (10). The end plate (10) and the two clamping plates (11) form a mounting groove (14) for inserting the bus terminal (5). The opening of the mounting groove (14) of one mounting portion (1) is opposite to the opening of the mounting groove (14) of the other mounting portion (1). A connecting plate (2) is provided between the end plate (10) of one mounting portion (1) and the end plate (10) of the other mounting portion (1). The connecting plate (2) and the two end plates (10) form an isolation groove (4).
2. The fixing buckle of the bus terminal according to claim 1, characterized in that, The two clamping plates (11) are spaced apart along a first direction, and at least one end of the end plate (10) along the first direction protrudes from the side of the corresponding clamping plate (11) away from the mounting groove (14).
3. The fixing clip for the bus terminal according to claim 2, characterized in that, In the same mounting part (1), the two clamping plates (11) are a first clamping plate (11a) and a second clamping plate (11b), respectively. One end of the end plate (10) protrudes from the side of the first clamping plate (11a) away from the mounting groove (14). The second clamping plate (11b) is connected to the end of the end plate (10) away from the first clamping plate (11a), and one end of the second clamping plate (11b) extends toward the centerline of the isolation groove (4).
4. The fixing buckle of the bus terminal according to claim 1, characterized in that, The connecting plate (2) is disposed at the non-end of the end plate (10) so that the two sides of the connecting plate (2) in the thickness direction respectively form the isolation groove (4) between the two end plates (10).
5. The fixing buckle of the bus terminal according to claim 1, characterized in that, An expansion plate (3) is provided inside the isolation groove (4). The expansion plate (3) is perpendicular to the depth direction of the isolation groove (4). A notch (31) is provided on the expansion plate (3). The notch (31) can separate the two ends of the expansion plate (3) along the arrangement direction of two adjacent bus terminals (5).
6. The fixing clip for the bus terminal according to claim 5, characterized in that, The isolation groove (4) is provided with a plurality of expansion plates (3), which are distributed at intervals along the depth direction of the isolation groove (4).
7. The fixing clip for the bus terminal according to claim 5, characterized in that, The width of the notch (31) is greater than or equal to 1 mm.
8. The fixing clip for the bus terminal according to claim 5, characterized in that, The expansion plate (3) has notches (31) at both opposite ends.
9. The fixing clip for the bus terminal according to claim 1, characterized in that, A baffle (13) is provided between the two clamps, and the baffle (13) forms one of the side walls of the mounting groove (14).
10. The fixing buckle of the bus terminal according to claim 1, characterized in that, The free end of the clamp is provided with a guide slope for inserting the bus terminal (5).
11. A battery cell busbar assembly, characterized in that, Includes a fixing buckle for a bus terminal as described in any one of claims 1 to 9 and at least two bus terminals (5), with the opposite ends of two adjacent bus terminals (5) respectively inserted into two mounting slots (14) on the fixing buckle.
12. The battery cell busbar assembly according to claim 11, wherein the busbar terminal (5) is interference-fitted with the mounting groove (14) and the interference amount δ=0.05-0.1mm.