High-rate large battery cell
By using a symmetrically arranged core and staggered tab design, combined with aluminum and copper flexible connectors, the problems of insufficient overcurrent capacity and high welding difficulty in traditional large battery cells are solved, achieving a high-efficiency improvement in battery performance.
Patent Information
- Application Number
- CN202422636738.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Traditional large-cell designs suffer from insufficient overcurrent capacity of single-sided tabs and increased welding difficulty and low process efficiency due to stacked design.
The first and second cores are symmetrically arranged, with staggered positive and negative electrode tabs on each core. They are welded to the tabs using aluminum and copper flexible connectors, and Mylar film is used as an insulating layer to ensure the safety of the battery cell.
It improves the current carrying capacity of the battery cell, reduces the welding difficulty, improves the process efficiency, and enhances the current carrying capacity of the battery without reducing the battery rate performance.
Smart Images
Figure CN223680141U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of battery cell design, especially to a high rate large battery cell. BACKGROUND
[0002] In the development process of energy storage systems, with the increasing demand for battery capacity of energy storage devices, large-capacity battery cells are increasingly widely used. However, the traditional large battery cell adopts a single-sided tab winding structure design. This design cannot meet the requirements of large current charging and discharging when the capacity of the battery cell increases due to the limited current-carrying capacity of the single-sided tab. To solve this problem, some energy storage companies have introduced a laminated battery cell design, that is, each tab is equipped with an independent tab. Although this method can enhance the current-carrying capacity of the battery cell, it also leads to a doubling of the number of tabs, increasing the welding difficulty in battery cell manufacturing, and the laminated process is less efficient than the winding process.
[0003] Therefore, it is imperative to redesign a high-rate large battery cell. SUMMARY
[0004] In view of the defects of the prior art, the utility model provides a high-rate large battery cell, aiming to solve the problem of insufficient current-carrying capacity caused by single-sided tab design and increased welding difficulty and reduced process efficiency caused by laminated design after increasing the capacity of the large battery cell in the prior art.
[0005] To achieve the above purpose, the utility model adopts the technical scheme of a high-rate large battery cell, comprising a shell, the shell is configured with symmetrically arranged first and second winding cores, the upper end surface of the first winding core is symmetrically provided with a first misaligned positive tab group and a first misaligned negative tab group, the upper end surface of the second winding core is symmetrically provided with a second misaligned positive tab group and a second misaligned negative tab group, the upper end of the shell is provided with a cover plate assembly, the cover plate assembly comprises a cover plate body and a positive pole structure and a negative pole structure embedded in the cover plate body respectively, the bottom end surface of the positive pole structure is welded with an aluminum soft connecting piece, the bottom end surface of the aluminum soft connecting piece is welded on the first and second misaligned positive tab groups, the bottom end surface of the negative pole structure is welded with a copper soft connecting piece, and the bottom end surface of the copper soft connecting piece is welded on the first and second misaligned negative tab groups.
[0006] Based on the above, the beneficial effects of a high-multiplying large battery cell are to solve the problems of insufficient overcurrent capacity caused by single-sided tab design and increased welding difficulty and reduced process efficiency caused by the lamination design of the large cell after increasing the capacity in the prior art; mainly embodied in: the utility model discloses a double-cell structure of the first winding core and the second winding core, and the first misaligned positive tab group, the first misaligned negative tab group, the second misaligned positive tab group and the second misaligned negative tab group arranged on each winding core, effectively increase the number of tabs, thereby improving the overcurrent capacity of the cell, specifically, the misaligned positive tab group is composed of mutually misaligned back-to-positive tabs and face-to-positive tabs, and the misaligned negative tab group is composed of mutually misaligned back-to-negative tabs and face-to-negative tabs, which not only increases the number of tabs, but also ensures that the tabs will not be thick due to the original lamination design of the two-sided tabs, thereby avoiding the problem of increased welding difficulty, and also speeding up the process efficiency; the utility model also adopts aluminum soft connecting pieces and copper soft connecting pieces of double-butterfly structure, and ultrasonic welding of the two-sided same-pole tabs of the double cells to the soft connecting pieces, so that the overcurrent capacity of the cell is further improved, and the battery multiplicity is also increased without reducing the battery multiplicity performance.
[0007] Further, the first misaligned positive tab group includes a first back-to-positive tab and a first face-to-positive tab, the first misaligned negative tab group includes a first back-to-negative tab and a first face-to-negative tab, the second misaligned positive tab group includes a second back-to-positive tab and a second face-to-positive tab, and the second misaligned negative tab group includes a second back-to-negative tab and a second face-to-negative tab, and the misaligned distance of the first back-to-positive tab and the first face-to-positive tab, the first back-to-negative tab and the first face-to-negative tab, the second back-to-positive tab and the second face-to-positive tab, and the second back-to-negative tab and the second face-to-negative tab is 10mm.
[0008] Further, the bottom end face of the cover plate body is symmetrically provided with an inner pole column mounting groove on both sides, an external contact hole is provided through the center of the inner pole column mounting groove, the positive pole column structure is composed of a positive pole column body and a positive external contact, the negative pole column structure is composed of a negative pole column body and a negative external contact, the positive pole column body and the negative pole column body are respectively adapted to the two inner pole column mounting grooves, the positive external contact and the negative external contact are respectively exposed outside the cell through the respective external contact holes, and a ring of insulating adhesive layer is provided around the two external contact holes, for insulating and isolating the positive external contact and the negative external contact from the cover plate body.
[0009] Based on the above, the beneficial effects of the two inner pole column mounting grooves are to respectively mount the positive pole column structure and the negative pole column structure; the beneficial effect of the external contact hole is to facilitate the electrical signal connection of the positive pole column structure and the negative pole column structure with external equipment; the beneficial effect of the positive pole column body is to conductively connect the first and second offset positive lug groups through the aluminum soft connecting piece; the beneficial effect of the positive external contact is to realize the positive connection of the battery cell with the outside through the external circuit or equipment; the beneficial effect of the negative pole column body is to conductively connect the first and second offset negative lug groups through the copper soft connecting piece; and the beneficial effect of the negative external contact is to realize the negative connection of the battery cell with the outside through the external circuit or equipment.
[0010] Further, the upper end face of the aluminum soft connecting piece is laser welded on the bottom end face of the positive pole column body, the bottom end face of the aluminum soft connecting piece is ultrasonically welded on the upper end faces of the first and second back-facing positive lug groups and the first and second facing positive lug groups, the upper end face of the copper soft connecting piece is laser welded on the bottom end face of the negative pole column body, and the bottom end face of the copper soft connecting piece is ultrasonically welded on the upper end faces of the first and second back-facing negative lug groups and the first and second facing negative lug groups.
[0011] Further, the positive pole column structure is made of aluminum metal, and the negative pole column structure is made of copper metal.
[0012] Further, a Mylar film is arranged between the first and second winding cores, which is used as an insulating isolation layer to prevent the short circuit of the battery cell between the first and second winding cores.
[0013] Based on the above, the beneficial effect of the Mylar film is to prevent the short circuit of the battery cell between the two winding cores, thereby improving the safety of the battery cell.
[0014] In order to make the above features of the utility model and the purposes to be achieved more clearly, the utility model will be further described in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 is a perspective view of the utility model;
[0016] Figure 2 is an exploded schematic view of the utility model;
[0017] Figure 3 is a schematic view of the first and second winding cores of the utility model;
[0018] Figure 4 is a schematic view of the upper end face of the cover plate body of the utility model;
[0019] Figure 5: it is the schematic view of the lower end surface of the cover plate body of the utility model;
[0020] Figure 6 : it is the cover plate body schematic view of the utility model that welded aluminum flexible connecting piece and copper flexible connecting piece;
[0021] Figure 7 : it is the marking schematic view of T1, H1 and W1 of the utility model;
[0022] Figure 8 : it is the marking schematic view of T2, H2 and W2 of the utility model;
[0023] Figure 9 : it is the marking schematic view of L1, L2, L3, L4, L5, L6, W3, W4, W5, W6, H3 and H4 of the utility model;
[0024] Figure 10 : it is the marking schematic view of L7, L8, W7, W8 and T3 of the utility model;
[0025] Figure 11 : it is the marking schematic view of L11, L12, L13, L14, L15 and W11 of the utility model;
[0026] Figure 12 : it is the marking schematic view of L11, L16, L17, L18, L19, W11 and W12 of the utility model.
[0027] BRIEF DESCRIPTION OF DRAWINGS: 1 - shell, 2 - first winding core, 21 - first misaligned positive lug group, 211 - first back positive lug, 212 - first face positive lug, 22 - first misaligned negative lug group, 221 - first back negative lug, 222 - first face negative lug, 221 - first back negative lug, 222 - first face negative lug, 3 - second winding core, 31 - second misaligned positive lug group, 311 - second back positive lug, 312 - second face positive lug, 32 - second misaligned negative lug group, 321 - second back negative lug, 322 - second face negative lug, 4 - cover plate assembly, 41 - cover plate body, 411 - inner pole mounting groove, 412 - external contact hole, 4121 - insulating adhesive layer, 42 - positive pole structure, 421 - aluminum flexible connecting piece, 422 - positive pole body, 423 - positive external contact, 43 - negative pole structure, 431 - copper flexible connecting piece, 432 - negative pole body, 433 - negative external contact, 5 - Mylar film. DETAILED DESCRIPTION
[0028] As Figures 1-6As shown, a high-magnification large battery cell includes a shell 1, a first winding core 2 and a second winding core 3 are symmetrically arranged in the shell 1, a first misaligned positive lug group 21 and a first misaligned negative lug group 22 are symmetrically arranged on the upper end face of the first winding core 2, a second misaligned positive lug group 31 and a second misaligned negative lug group 32 are symmetrically arranged on the upper end face of the second winding core 3, a cover plate assembly 4 is arranged on the upper end of the shell 1, the cover plate assembly 4 includes a cover plate body 41 and a positive pole column structure 42 and a negative pole column structure 43 embedded in the cover plate body 41 respectively, an aluminum soft connecting piece 421 is welded on the bottom end face of the positive pole column structure 42, the bottom end face of the aluminum soft connecting piece 421 is welded on the first misaligned positive lug group 21 and the second misaligned positive lug group 31, a copper soft connecting piece 431 is welded on the bottom end face of the negative pole column structure 43, and the bottom end face of the copper soft connecting piece 431 is welded on the first misaligned negative lug group 22 and the second misaligned negative lug group 32.
[0029] The first misaligned positive lug group 21 includes a first backward positive lug 211 and a first forward positive lug 212, the first misaligned negative lug group 22 includes a first backward negative lug 221 and a first forward negative lug 222, the second misaligned positive lug group 31 includes a second backward positive lug 311 and a second forward positive lug 312, and the second misaligned negative lug group 32 includes a second backward negative lug 321 and a second forward negative lug 322, the misaligned distance of the first backward positive lug 211 and the first forward positive lug 212, the first backward negative lug 221 and the first forward negative lug 222, the second backward positive lug 311 and the second forward positive lug 312, and the second backward negative lug 321 and the second forward negative lug 322 is 10mm.
[0030] Two inner pole column installation grooves 411 are symmetrically arranged on the bottom end face of the cover plate body 41, an external contact hole 412 is arranged through the center of the inner pole column installation groove 411, the positive pole column structure 42 is composed of a positive pole column body 422 and a positive external contact 423, the negative pole column structure 43 is composed of a negative pole column body 432 and a negative external contact 433, the positive pole column body 422 and the negative pole column body 432 are respectively fitted into the two inner pole column installation grooves 411, the positive external contact 423 and the negative external contact 433 are respectively exposed to the outside of the battery through the respective external contact holes 412, and a ring of insulating adhesive layer 4121 is arranged around the two external contact holes 412, for insulating and isolating the positive external contact 423 and the negative external contact 433 from the cover plate body 41.
[0031] The upper end face of the aluminum soft connecting piece 421 is laser welded on the bottom end face of the positive column body 422, the bottom end face of the aluminum soft connecting piece 421 is ultrasonic welded on the upper end faces of the first back positive lug 211, the first face positive lug 212, the second back positive lug 311 and the second face positive lug 312, the upper end face of the copper soft connecting piece 431 is laser welded on the bottom end face of the negative column body 432, and the bottom end face of the copper soft connecting piece 431 is ultrasonic welded on the upper end faces of the first back negative lug 221, the first face negative lug 222, the second back negative lug 321 and the second face negative lug 322.
[0032] The positive column structure 42 is made of aluminum metal, and the negative column structure 43 is made of copper metal.
[0033] The first winding core 2 and the second winding core 3 are provided with a Mylar film 5, which is used as an insulating isolation layer to prevent the short circuit between the first winding core 2 and the second winding core 3.
[0034] In summary, the specific implementation manner of the utility model is:
[0035] Referring to Figures 1-12
[0036] Embodiment one
[0037] The embodiment provides a high-multiplying large battery cell, which is suitable for a lithium iron phosphate system with a model of 72*346*204 (thickness T1*width W1*height H1), a capacity equal to 600+ / -50 Ah and an energy equal to 1920+ / -160 Wh. The battery structure retains a conventional square structure and is composed of a shell 1, a first winding core 2, a second winding core 3, a cover plate assembly 4, an aluminum soft connecting piece 421, a copper soft connecting piece 431, a Mylar film 5 and the like.
[0038] The first winding core 2 and the second winding core 3 are symmetrically designed and have the same size, i.e., the thickness T2 = 34-36 mm, the width W2 = 341-343 mm, and the height H2 = 197-200 mm. The first staggered positive lug group 21 is located on the left side of the first winding core 2, and the first staggered negative lug group 22 is located on the right side. The horizontal distance L1 between the center of the first back positive lug 211 on the left side of the first winding core 2 and the left edge of the first winding core 2 is 48±2 mm, and the distance L2 between the center of the first face positive lug 212 and the center of the first back positive lug 211 is 50±2 mm. The staggered distance between the first back positive lug 211 and the first face positive lug 212 is 10 mm. The horizontal distance L3 between the center of the first back negative lug 221 on the right side of the first winding core 2 and the right edge of the first winding core 2 is L1, and the distance L4 between the center of the first face negative lug 222 and the center of the first back negative lug 221 is L2. The first back positive lug 211, the first face positive lug 212, the first back negative lug 221, and the first face negative lug 222 have the same size, i.e., the upper width W3 = W5 = 36 mm, the lower width W4 = W6 = 40 mm, and the height H3 = H4 = 28 mm.
[0039] On the back side, the distance between the first back positive lug 211 and the first back negative lug 221 is L5 = W1-L1-L3-5 mm = 245±2 mm. On the face side, the distance between the first face positive lug 212 and the first face negative lug 222 is L6 = W1-L1-L3-L2-L4-5 mm = 145±2 mm.
[0040] The soft connection includes an aluminum soft connection 421 (for cooperation with the positive electrode) and a copper soft connection 431 (for cooperation with the negative electrode), and both have a double-butterfly structure. The aluminum soft connection 421 and the copper soft connection 431 are symmetrically designed in the horizontal and vertical directions, and have the same size, i.e., the horizontal width W7 = 60 mm, the length of the two butterfly structures in the vertical direction L7 = 40 mm, the length of the middle concave part L8 = 10 mm, the width W8 = 20 mm, and the thickness T3 = 2 mm.
[0041] The width W11 of the cover plate body 41 is T1-1 mm = 71 mm, the length L11 is W1-1 = 345 mm, the horizontal distance L12 between the center of the positive outer contact 423 and the center of the negative outer contact 433 is 296 mm, the side length L13 of the positive outer contact 423 and the negative outer contact 433 is 24 mm, the side length L14 of the insulating adhesive layer 4121 outside the positive outer contact 423 and the negative outer contact 433 is 26 mm, the distance L15 from the front edge of the insulating adhesive layer 4121 to the front edge of the cover plate body 41 is 25 mm, the horizontal distance L16 between the center of the positive pole body 422 and the center of the negative pole body 432 is 196.5 mm, the width W12 of the positive pole body 422 and the negative pole body 432 is 40 mm, the length L17 is nL7+L8 = 90 mm (n≥2), the horizontal distance L18 from the center of the positive pole body 422 to the left edge of the cover plate body 41 is (L11-L16) / 2 = 76.52 mm, and the horizontal distance L19 from the center of the positive pole body 422 to the rear edge of the cover plate body 41 is (W11-W12) / 2+W12 / 2 = 35.5 mm.
[0042] It should be particularly noted that the first offset positive lug group 21, the first offset negative lug group 22, the second offset positive lug group 31 and the second offset negative lug group 32 can increase the number of offset lugs according to the required overcurrent capacity of the capacity expansion of the battery cell.
[0043] Example Two
[0044] The embodiment provides a high-multiplying large battery cell, which is also applicable to a lithium iron phosphate system with a model of 80x346x204 (thickness T1xwidth W1xheight H1), a capacity equal to 670±50 Ah and an energy equal to 2144±160 Wh. The battery structure retains a conventional square structure and is composed of a shell 1, a first winding core 2, a second winding core 3, a cover plate assembly 4, an aluminum flexible connecting piece 421, a copper flexible connecting piece 431, a Mylar film 5 and the like.
[0045] The first winding core 2 and the second winding core 3 are symmetrically designed and have the same size, i.e., the thickness T2 = 38-40 mm, the width W2 = 341-343 mm, and the height H2 = 197-200 mm. The first staggered positive lug group 21 is located on the left side of the first winding core 2, and the first staggered negative lug group 22 is located on the right side. The horizontal distance L1 between the center of the first back positive lug 211 on the left side of the first winding core 2 and the left edge of the first winding core 2 is 48±2 mm, and the distance L2 between the center of the first face positive lug 212 and the center of the first back positive lug 211 is 50±2 mm. The staggered distance between the first back positive lug 211 and the first face positive lug 212 is 10 mm. The horizontal distance L3 between the center of the first back negative lug 221 on the right side of the first winding core 2 and the right edge of the first winding core 2 is L1, and the distance L4 between the center of the first face negative lug 222 and the center of the first back negative lug 221 is L2. The first back positive lug 211, the first face positive lug 212, the first back negative lug 221, and the first face negative lug 222 have the same size, i.e., the upper width W3 = W5 = 36 mm, the lower width W4 = W6 = 40 mm, and the height H3 = H4 = 28 mm.
[0046] On the back side, the distance between the first back positive lug 211 and the first back negative lug 221 is L5 = W1-L1-L3-5 mm = 245±2 mm. On the face side, the distance between the first face positive lug 212 and the first face negative lug 222 is L6 = W1-L1-L3-L2-L4-5 mm = 145±2 mm.
[0047] The soft connection includes an aluminum soft connection piece 421 (for cooperation with the positive electrode) and a copper soft connection piece 431 (for cooperation with the negative electrode), and both have a double-butterfly structure. The aluminum soft connection piece 421 and the copper soft connection piece 431 are symmetrically designed in the horizontal and vertical directions, and have the same size, i.e., the horizontal width W7 = 60 mm, the length of the two butterfly structures in the vertical direction L7 = 40 mm, the length of the middle concave part L8 = 10 mm, the width W8 = 20 mm, and the thickness T3 = 2 mm.
[0048] The width W11 of the cover plate body 41 is T1-1 mm=71 mm, the length L11 is W1-1=345 mm, the horizontal distance L12 between the center of the positive outer contact 423 and the center of the negative outer contact 433 is 296 mm, the side length L13 of the positive outer contact 423 and the negative outer contact 433 is 24 mm, the side length L14 of the insulating adhesive layer 4121 outside the positive outer contact 423 and the negative outer contact 433 is 26 mm, the distance L15 from the front edge of the insulating adhesive layer 4121 to the front edge of the cover plate body 41 is 25 mm, the horizontal distance L16 between the center of the positive post body 422 and the center of the negative post body 432 is 196.5 mm, the width W12 of the positive post body 422 and the negative post body 432 is 40 mm, the length L17 is nL7+L8=90 mm (n≥2), the horizontal distance L18 from the center of the positive post body 422 to the left edge of the cover plate body 41 is (L11-L16) / 2=76.52 mm, and the horizontal distance L19 from the center of the positive post body 422 to the rear edge of the cover plate body 41 is (W11-W12) / 2+W12 / 2=35.5 mm.
[0049] The above description is only the optimal solution embodiment of the present application, and is not used to limit the present application. Various modifications or replacements of the present application made by those skilled in the art without departing from the essence and protection scope of the present application should be within the protection scope of the present application.
Claims
1. A high rate large battery cell comprising a housing (1), characterized in that: The shell (1) is provided with symmetrically arranged first winding core (2) and second winding core (3), the upper end face of the first winding core (2) is symmetrically provided with first misaligned positive lug group (21) and first misaligned negative lug group (22), the upper end face of the second winding core (3) is symmetrically provided with second misaligned positive lug group (31) and second misaligned negative lug group (32), the upper end of the shell (1) is provided with a cover plate assembly (4), the cover plate assembly (4) includes a cover plate body (41) and a positive pole column structure (42) and a negative pole column structure (43) embedded in the cover plate body (41) respectively, the bottom end face of the positive pole column structure (42) is welded with an aluminum soft connecting piece (421), the bottom end face of the aluminum soft connecting piece (421) is welded on the first misaligned positive lug group (21) and the second misaligned positive lug group (31), the bottom end face of the negative pole column structure (43) is welded with a copper soft connecting piece (431), the bottom end face of the copper soft connecting piece (431) is welded on the first misaligned negative lug group (22) and the second misaligned negative lug group (32).
2. A high rate large battery cell according to claim 1, characterized in that: The first misaligned positive lug group (21) includes a first backward positive lug (211) and a first forward positive lug (212), the first misaligned negative lug group (22) includes a first backward negative lug (221) and a first forward negative lug (222), the second misaligned positive lug group (31) includes a second backward positive lug (311) and a second forward positive lug (312), the second misaligned negative lug group (32) includes a second backward negative lug (321) and a second forward negative lug (322), the misaligned distance of the first backward positive lug (211) and the first forward positive lug (212), the first backward negative lug (221) and the first forward negative lug (222), the second backward positive lug (311) and the second forward positive lug (312), the second backward negative lug (321) and the second forward negative lug (322) are all 10mm.
3. A high rate large battery cell according to claim 2, characterized in that: The bottom end face of the cover plate body (41) is symmetrically provided with an inner pole column mounting groove (411) on both sides, the center of the inner pole column mounting groove (411) is provided with an external contact hole (412), the positive pole column structure (42) is composed of a positive pole column body (422) and a positive external contact (423), the negative pole column structure (43) is composed of a negative pole column body (432) and a negative external contact (433), the positive pole column body (422) and the negative pole column body (432) are respectively fitted into the two inner pole column mounting grooves (411), the positive external contact (423) and the negative external contact (433) are respectively exposed outside the battery cell through the respective external contact holes (412), and a ring of insulating adhesive layer (4121) is provided around the two external contact holes (412) for insulating and isolating the positive external contact (423) and the negative external contact (433) from the cover plate body (41).
4. A high rate large battery cell according to claim 3, wherein: The upper end face of the aluminum soft connecting piece (421) is laser welded on the bottom end face of the positive column body (422), the bottom end face of the aluminum soft connecting piece (421) is ultrasonic welded on the upper end faces of the first back positive lug (211), the first face positive lug (212), the second back positive lug (311) and the second face positive lug (312), the upper end face of the copper soft connecting piece (431) is laser welded on the bottom end face of the negative column body (432), and the bottom end face of the copper soft connecting piece (431) is ultrasonic welded on the upper end faces of the first back negative lug (221), the first face negative lug (222), the second back negative lug (321) and the second face negative lug (322).
5. The high rate large battery cell of claim 1, wherein: The positive column structure (42) is made of aluminum metal, and the negative column structure (43) is made of copper metal.
6. A high rate large battery cell according to claim 1, wherein: A Mylar film (5) is arranged between the first winding core (2) and the second winding core (3), and the Mylar film (5) is used as an insulating isolation layer to prevent short circuit between the first winding core (2) and the second winding core (3).