Battery pack tab support structure

Abstract

According to the battery pack tab support structure provided by the invention, when a naked battery cell is assembled, the middle lower part of the battery cell tab passes through the tab guide edge and then penetrates out of the tab bundling hole, and then the tab bundle is welded on the battery connecting piece in a lap welding manner, so that series-parallel connection of the battery cell is realized, the plate frame support adopts the trapezoidal groove to fix the battery cell, the movement of the battery cell is avoided, and the battery cell assembly efficiency is improved. The main reinforcing ribs are additionally arranged on the inner surfaces of the trapezoidal grooves, so that the overall strength of the battery pack is improved, and the screw holes and the positioning columns are arranged in the grooves according to the arrangement of the battery core connecting sheets, so that the pcb and the connecting copper bars are fixed. According to the structure, on the basis of meeting the lightweight requirement of the battery pack, the insulating property of the battery pack is enhanced, and the overall strength of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a lithium battery tab support structure. Background Technology

[0002] With the development of various technologies and applications in the new energy field, and the changes in the current international situation, new energy batteries have attracted much attention and have a huge market prospect. Soft-pack lithium-ion batteries have advantages such as light weight, high energy density, good safety performance, long cycle life, and large battery capacity, and have been widely used in the new energy field.

[0003] Compared to other types of battery packs, soft-pack lithium-ion battery packs require the positive and negative tabs of the bare cell output terminals to be welded together in a series-parallel design. Then, the tabs and connecting pieces are welded together to achieve the series-parallel connection between the cells. The bare cell tabs are thin and easily damaged during stretching, making welding difficult. Furthermore, longer tabs can lead to tab redundancy, increasing the risk of tab insertion and potentially causing internal short circuits, resulting in battery failure. In existing technologies, to achieve insulation between the bare cell body and the tabs and to better weld and fix the tabs to the battery connecting pieces, tab brackets are typically placed between the bare cell and the battery connecting pieces. However, due to the internal structure limitations of the bare cell, the designed tab brackets are difficult to assemble, and the tabs are easily damaged when passing through the tab bracket. Welding within the tab bracket after it passes through is difficult and inefficient. Additionally, the regular tab bracket structure cannot meet the requirements for lightweight battery packs. Utility Model Content

[0004] In view of the technical problems mentioned in the background art, the purpose of this utility model is to provide a lithium-ion battery tab bracket with a reasonable structural design that meets the requirements of lightweight battery pack and can improve the overall electrical safety and structural stability of the battery pack.

[0005] To achieve the above objectives, this utility model application provides a battery pack tab support structure, including: a frame support, a fixed trapezoidal groove, a tab gathering hole, a wire harness storage hole, a main reinforcing rib, a fixing screw hole, and a positioning post. The frame support is connected to the PCB sampling board through the screw hole. The frame support has a recessed fixed trapezoidal groove structure inside. The tab gathering hole is provided in the width direction of the recessed fixed trapezoidal groove. The wire harness storage hole is located in the bottom width direction of the recessed fixed trapezoidal groove. The main reinforcing rib is provided in a transversely evenly distributed manner inside the recessed fixed trapezoidal groove. The thickness of the main reinforcing rib is consistent with the thickness of the frame support.

[0006] Preferably, the plate frame support structure adopts an integrated plate frame structure, which is connected to the PCB sampling board through screw holes;

[0007] Preferably, buffer foam is arranged between the adjacent sunken fixed trapezoidal grooves;

[0008] Preferably, the frame adopts an inward-locking structure around its perimeter;

[0009] Preferably, the recessed fixed trapezoidal groove is arranged recessedly along the length of the plate frame support, forming a groove-shaped cavity inside, and the thickness of the bottom of the recessed fixed trapezoidal groove is slightly less than the thickness of the waist of the trapezoidal groove;

[0010] Preferably, there are two electrode tab receiving holes, and the width of the electrode tab receiving holes is much larger than the thickness of the electrode tab bundle;

[0011] Preferably, the recessed fixed trapezoidal groove is provided with horizontally evenly distributed main reinforcing ribs, and the thickness of the main reinforcing ribs is consistent with the thickness of the plate frame support.

[0012] Preferably, the bottom of the plate frame support is provided with transverse reinforcing ribs and longitudinal reinforcing ribs, and screw holes are provided at the intersection of the transverse and longitudinal reinforcing ribs;

[0013] Preferably, the board frame support is provided with transverse and longitudinal secondary reinforcing ribs in the trapezoidal grooves at the input and output ends, and positioning posts are provided at the transverse and longitudinal secondary reinforcing ribs to fix the connecting copper busbars on the PCB board.

[0014] Compared with the prior art, the advantages of this utility model are as follows: The plate frame support adopts an internal sunken trapezoidal groove structure, and the main body width direction is provided with electrode tab gathering holes, which are evenly distributed between adjacent sunken fixed trapezoidal grooves. Together with the electrode tab guide edge of the sunken fixed trapezoidal groove, they achieve electrode tab gathering and insulation. The main body of the support has evenly distributed main body reinforcing ribs inside the groove, which increases the overall strength of the support while providing more support surface for the PCB board fixation, thus providing overall stability of the battery pack. The groove structure also has secondary reinforcing ribs of varying thickness, which are provided with screw holes and positioning posts to fix the support, PCB board, input copper busbar, and output copper busbar, further improving the insulation performance of the battery pack and enhancing the overall strength of the battery pack. Attached Figure Description

[0015] Figure 1 This is a front view of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the present invention;

[0017] Explanation of main component symbols: 1. Plate frame; 2. Fixing trapezoidal groove; 3. Electrode gathering hole; 4. Wire harness storage hole; 5. Main reinforcing rib; 6. Fixing screw hole; 7. Positioning post. Specific Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-2 As shown, a battery pack tab support structure includes: a frame support, a fixed trapezoidal groove, tab gathering holes, wire harness storage holes, main reinforcing ribs, fixing screw holes, and positioning posts. The frame support is connected to the PCB sampling board through screw holes. The recessed fixed frame support has a recessed fixed trapezoidal groove structure inside. The tab gathering holes are provided in the width direction of the recessed fixed trapezoidal groove. The wire harness storage holes are provided in the bottom width direction of the trapezoidal groove. The main reinforcing ribs are provided in the recessed fixed trapezoidal groove and are evenly distributed laterally. The thickness of the main reinforcing ribs is consistent with the thickness of the frame support.

[0020] Frame 1: This is the main structure of the tab support, using an integrated frame structure. It is connected to the PCB sampling board via screw holes. The interior of the support body features a recessed, fixed trapezoidal groove structure. Adjacent recessed trapezoidal grooves have tab gathering holes. The waist of the groove structure serves as the tab guide edge. The lower tabs of the battery cells are distributed along the guide edge. Buffer foam is placed between adjacent recessed trapezoidal grooves. Together with the tab gathering holes and the tab guide edge of the groove structure, this effectively gathers the tabs while ensuring cell insulation. The bottom plane of the trapezoidal groove is used to fix the battery cells, increasing the fixation and insulation between them. Wiring harness storage holes are provided on both sides of the trapezoidal groove width, facilitating the routing of the basic sampling wiring harness of the battery pack and improving the space utilization of the battery pack. The support uses an inward-locking structure around its perimeter, increasing the assembly strength between the tab support and the housing.

[0021] Fixed Trapezoidal Slot 2: Different sized recessed fixed trapezoidal slots are distributed along the length of the bracket, forming a groove-shaped cavity inside. The thickness of the bottom of the trapezoidal slot is slightly less than the thickness of the waist of the trapezoidal slot. While meeting the fixing strength, the weight of the bracket itself is reduced, which can meet the overall lightweight requirements of the battery pack. At the same time, the waists on both sides of the trapezoidal slot are the tab guide edges. Buffer foam is placed between adjacent tab guide edges to improve the insulation between the cells. The tab guide edges form a 51° angle with the bracket frame to prevent excessive bending angles when welding the base of the cell tabs and the upper middle part of adjacent tabs, which could cause damage to the tabs.

[0022] 3. A tab convergence hole: A tab convergence hole is provided between adjacent recessed fixed trapezoidal slots on the main frame of the bracket. There are two tab convergence holes in the width direction of the bracket, namely the positive tab convergence hole and the negative tab convergence hole of the battery cell. The parallel battery cell tabs pass through the tab guide edge of the trapezoidal slot and then pass through the tab convergence hole. They are welded to the aluminum busbar of the battery on the PCB board, which can better converge the parallel battery cell tabs. The width of the tab convergence hole is much larger than the thickness of the tab bundle, leaving space on the left and right sides of the tab bundle. While increasing the efficiency of the tab bundle connection, it avoids the wear of the tab bundle by the bracket and improves the overall electrical safety of the battery pack.

[0023] Wire harness storage hole 4: Wire harness storage holes are provided on both sides of the bottom width direction of the trapezoidal groove of the bracket. The current, voltage and other sampling lines of the battery pack pass through the wire harness storage holes and are connected to the sampling interface of the PCB board on the bracket, which improves the space utilization of the battery pack and reduces the weight of the bracket.

[0024] Main reinforcing rib 5: The trapezoidal groove of the bracket is equipped with horizontally evenly distributed main reinforcing ribs. The thickness of the main reinforcing ribs is consistent with the thickness of the plate frame bracket, which can better decompose the stress of the bracket and improve the overall strength of the bracket. The main reinforcing ribs provide more support surfaces for fixing the bracket to the PCB board, which can improve the overall stability of the battery pack.

[0025] Fixing screw hole 6: The bracket is combined with the arrangement of the battery connecting copper busbar. Some longitudinal reinforcing ribs are added at the horizontal reinforcing rib positions, and screw holes are set at the intersection points to fix the bracket, PCB board and copper busbar, thereby enhancing the overall insulation of the battery pack.

[0026] Positioning post 7: The bracket has horizontal and vertical secondary reinforcing ribs in the trapezoidal grooves at the input and output ends of the battery module. Positioning posts are set at the horizontal and vertical secondary reinforcing ribs, with 2 posts at each of the input and output ends, to fix the connecting copper busbars on the PCB board, preventing the copper busbars from rotating during the operation of the battery pack, thereby increasing the insulation performance of the battery pack.

[0027] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail to the present invention without departing from the scope of the present invention as defined in the appended claims are within the scope of protection of the present invention.

Claims

1. A battery pack tab holder structure, comprising: The plate frame support, fixed trapezoidal groove, electrode lug gathering hole, wire harness storage hole, main reinforcing rib, fixing screw hole, and positioning post are characterized in that the plate frame support is provided with a recessed fixed trapezoidal groove inside, the recessed fixed trapezoidal groove is provided with an electrode lug gathering hole in the width direction, the wire harness storage hole is provided in the bottom width direction of the recessed fixed trapezoidal groove, the main reinforcing rib is provided in the recessed fixed trapezoidal groove and the thickness of the main reinforcing rib is consistent with the thickness of the plate frame support.

2. The battery pack tab holder structure of claim 1, wherein, The plate frame support adopts an integrated plate frame structure, and the whole is connected to the PCB sampling plate through screw holes.

3. The battery pack tab holder structure of claim 2, wherein, Buffer foam is arranged between the adjacent sunken fixed trapezoidal grooves.

4. The battery pack tab holder structure of claim 2, wherein, The plate frame support adopts an inward snap-fit ​​structure around its perimeter.

5. The battery pack tab holder structure of claim 2, wherein, The sunken fixed trapezoidal groove is arranged sunkenly along the length of the plate frame support, forming a groove-shaped cavity inside. The thickness of the bottom of the sunken fixed trapezoidal groove is slightly less than the thickness of the waist of the trapezoidal groove.

6. The battery pack tab holder structure of claim 2, wherein, There are two tab-gathering holes in the width direction of the plate frame, and the width of the tab-gathering holes is much larger than the thickness of the tab bundle.

7. The battery pack tab holder structure of claim 2, wherein, The recessed fixed trapezoidal groove is provided with horizontally evenly distributed main reinforcing ribs, and the thickness of the main reinforcing ribs is consistent with the thickness of the plate frame support.

8. The battery pack tab holder structure of claim 2, wherein, The bottom of the plate frame support is provided with transverse reinforcing ribs and longitudinal reinforcing ribs, and screw holes are provided at the intersection of the transverse and longitudinal reinforcing ribs.

9. The battery pack tab holder structure of claim 2, wherein, The board frame support is provided with transverse and longitudinal secondary reinforcing ribs in the trapezoidal grooves at the input and output ends, and positioning posts are provided at the transverse and longitudinal secondary reinforcing ribs to fix the connecting copper busbars to the PCB board.

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