CN213278217U

CN213278217U - Flexible package battery module structure capable of secondary repair

Info

Publication number: CN213278217U
Application number: CN202021345792.3U
Authority: CN
Inventors: 杨显生
Original assignee: Shanghai Xuanyi New Energy Development Co Ltd
Current assignee: Shanghai Xuanyi New Energy Development Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-05-25
Anticipated expiration: 2030-07-09

Abstract

The utility model discloses a but secondary prosthetic flexible package battery module structure can solve battery electricity core and hardly reuse and the lower technical problem of electric core internal circulation performance. The battery cell comprises a conductive elastic sheet inserted on a tab of a battery cell body, and a fixed support arranged on the positive end or the negative end of the battery cell body; end plates are arranged at two ends of the cell body in parallel, and the heat conducting plate is fixed at the bottoms of the two end plates; the large wedge-shaped blocks are sequentially inserted into the wedge-shaped holes of the fixed support; the small wedge-shaped blocks are sequentially wedged into one end of the large wedge-shaped block and wedged into the fixed bracket, so that the large wedge-shaped block is wedged into the fixed position; the current conducting plate between the electric cores is arranged between the electric core bodies and tightly attached to and fixed with the electric conducting elastic sheet. The utility model utilizes the function of wedge force, improves the reliability of mechanical contact conduction and the large current conduction capability, avoids the secondary repair and separation of the battery cell due to the series-parallel connection of the welding lugs; in addition, the battery system is convenient to disassemble and maintain the single battery cell, and the maintenance cost of a client is reduced.

Description

Flexible package battery module structure capable of secondary repair

Technical Field

The utility model relates to a new forms of energy storage battery technical field, concretely relates to but secondary prosthetic flexible package battery module structure.

Background

The power lithium ion battery is used as an energy storage device and is popularized and applied in pure electric vehicles. When the battery system is attenuated to a certain degree, according to the regulations, the general battery system is not enough to support the effective mileage of the automobile when the energy is attenuated to 70% or 80% of the original energy, and the battery system is out of service, but more than 10% or 20% of the energy use value is still remained. Because the current battery system, whether a flexible package battery cell or a square battery cell, adopts a positive and negative electrode welding mode, the nondestructive disassembly cannot be realized, so that the battery cannot be reused on the surface of the battery cell; in addition, the service life of the battery is mostly the cycle performance attenuation caused by relative dryness of electrolyte in the battery cell due to the expansion of the pole piece and the reaction of the electrolyte in the cycle process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a but secondary prosthetic flexible package battery module structure can solve the current battery electricity core and hardly reuse and the lower technical problem of electric core internal circulation performance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a flexible package battery module structure capable of secondary repair comprises:

comprises a cell body, the cell body comprises a positive pole and a negative pole,

the battery pack is characterized by also comprising small wedge-shaped blocks, large wedge-shaped blocks, conductive elastic sheets, fixed supports, heat-conducting plates, battery pack covers and conductive plates for connecting the battery cells;

the conductive elastic sheet is inserted on a tab of the battery cell body, and the fixing support is arranged at the positive end or the negative end of the battery cell body;

the two ends of the cell body are provided with end plates in parallel, the end plates comprise a first end plate and a second end plate, and the first end plate, the second end plate and the fixed support are sequentially fixed to form a module;

the heat conducting plate is fixed at the bottom of the two end plates;

the large wedge-shaped blocks are sequentially inserted into the wedge-shaped holes of the fixed support;

the small wedge-shaped blocks are sequentially wedged into one end of the large wedge-shaped block and wedged into the fixed support, so that the large wedge-shaped block is wedged into the fixed position, and the conductive elastic sheet is tightly pressed on the lug by means of the wedging force of the wedge-shaped blocks;

placing the current-conducting plate between the electric cores between the electric core bodies, tightly attaching the current-conducting plate and the electric-conducting elastic sheet together, and welding the current-conducting plate and the electric-conducting elastic sheet together;

and (5) arranging and flattening the air bags of the battery cells in the same direction, and buckling a battery pack cover.

Further, in the above-mentioned case,

the conductive elastic sheet is made by folding copper foil into a U shape and then flattening; the tab of the battery cell is inserted between the two layers of copper foils and tightly pressed close to the tab under the pressure of the large wedge-shaped block.

Further, in the above-mentioned case,

the conductive elastic sheet is made by folding copper foil with the thickness of 0.3-1 mm into a U shape and then flattening.

Further, in the above-mentioned case,

in order to improve the contact area and ensure the conductive property, salient points are punched on the conductive elastic sheet and are in contact with the lug.

Further, in the above-mentioned case,

the diameter of the salient points is 0.5-3 mm, and the number of the salient points is 50-150;

further, the small wedge-shaped blocks are made of aluminum and plastic;

the large wedge-shaped block is made of metal aluminum materials, copper materials and plastics;

the fixing support is made of plastic.

Furthermore, heat conduction grease or heat conduction gasket is smeared between the bottom surfaces of the heat conduction plate and the battery cell body, and the vibration buffering effect is achieved.

Furthermore, the current conducting plate between the electric cores and the conducting elastic sheet are fixed in a laser welding mode.

The utility model also discloses a disassembling method of the flexible package battery module structure capable of secondary repair, which is also based on the flexible package battery module structure capable of secondary repair,

the method comprises the following steps:

21) taking out the small wedge-shaped block;

22) the wedging force of the large wedge-shaped block is removed;

23) integrally taking out the conductive plate and the conductive elastic sheet;

24) disassembling the battery pack cover and the heat conducting plate;

25) loosening the fixing bolts, dismounting the first end plate and the second end plate, and separating the cell body from other components;

26) the fixing support is disassembled, and the battery cell bodies are respectively stored.

According to the above technical scheme, the utility model discloses a but secondary prosthetic flexible package battery module structure has following beneficial effect:

1. different from the traditional flexible package battery cell, the final sealing and edge folding process is cancelled, and the air bag design battery module structure during liquid injection is reserved so as to be convenient for secondary final sealing after liquid replenishing;

2. when the module structure is designed, the effect of the wedge force is utilized, the reliability of mechanical contact conduction and the large-current conduction capability are improved, series-parallel connection of welding lugs is avoided, and secondary repair and sorting of the battery cell are realized by reutilization; in addition, the single-battery-core disassembly maintenance of the battery system is facilitated, and the maintenance cost of a client is reduced;

3. provides a packaging structure which breaks through the difficulty of thickness limit in traditional cell packaging and is beneficial to electricity

The core is internally heat-conducting, and the grouping rate of the battery pack is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a partial structural schematic diagram of the present invention;

fig. 3 is a schematic view of the structure of the conductive elastic sheet of the present invention;

fig. 4 is a schematic top view of the conductive elastic sheet of the present invention;

FIG. 5 is a schematic view of the internal structure of the present invention;

fig. 6 is a schematic diagram of a side view of the heat conducting plate and the battery cover of the present invention;

fig. 7 is a schematic view of the parallel combination of the end plates of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Fig. 1-7 show the schematic structural diagrams of the flexible package battery cell of the embodiment of the present invention, which are connected to the tab of the battery cell when the battery cell is grouped into a module, and are free from welding when the battery cell is fixed. To illustrate the mechanism, the positive terminal structure is taken as an example, and the negative terminal structure is the same.

The structure comprises a small wedge-shaped block 1, a large wedge-shaped block 2, a conductive elastic sheet 3 and a fixed support 4. The conductive elastic sheet 3 is made by folding copper foil with the thickness of 0.3-1 mm into a U shape and then flattening as shown in figure 3, wherein the middle of two layers of copper foil is convenient for inserting into a tab 5 of a battery cell 5, and the tab 5 is tightly attached to the tab under the pressure of a large wedge-shaped block 2, in order to improve the contact area and ensure the conductive characteristic, salient points are punched on the conductive elastic sheet, the salient points are in contact with the tab 5, the diameter of the salient points is 0.5-3 mm, and the number of the salient points is 50-150. The small wedge-shaped block 1 can be made of aluminum, plastic and the like, the large wedge-shaped block 2 can be made of metal aluminum, copper, plastic and the like, and the fixed support 4 is made of plastic and the like.

As shown in fig. 5, 6 and 7, the battery pack according to the embodiment is constructed. The battery pack is composed of a small wedge-shaped block 1, a large wedge-shaped block 2, a conductive elastic sheet 3, a fixing support 4, a battery cell 6, a heat conduction plate 7, a battery pack cover 8, an end plate 9, an end plate 10, a conductive plate 11 connected among the battery cells and 4 long bolts for connection and fixation.

The assembly sequence and the function are as follows:

1. firstly, the conductive elastic sheet 3 is inserted on the tab 5 of the battery cell 6, and then the fixing support 4 is collided with the positive end of the battery cell and has the same structure with the negative end. Forming a basic assembly unit, arranging the battery cell, the end plates 9 and 10 together according to the required series-parallel connection requirement as shown in figure 7, sequentially penetrating the holes in the end plates 9 and 10 and the fixing support 4 by bolts to form a module, fixing the heat conducting plate 7 at the bottom of the two end plates, and smearing heat conducting grease or a heat conducting gasket between the heat conducting plate 7 and the bottom surface of the battery cell 6 to play a role in vibration buffering;

2. sequentially inserting the large wedge-shaped blocks 2 into the wedge-shaped holes of the fixed support 2;

3. then the small wedge-shaped block 1 is wedged into one end of the large wedge-shaped block 2 in sequence and wedged into the fixed support 4, so that the large wedge-shaped block 2 is wedged into a fixed position, the conductive elastic sheet 3 is tightly pressed on the lug 5 by means of the wedging force of the wedge-shaped block, and the convex point on the conductive elastic sheet 3 is tightly contacted with the lug 5 to play a role in conducting high current;

4. placing the current-conducting plate 11 between the electric cores 6, tightly attaching the current-conducting plate to the conductive elastic sheet 3, and welding the current-conducting plate to the conductive elastic sheet 3 in a laser welding manner;

5. level the gasbag with electric core according to same orientation arrangement, buckle group battery lid 8, accomplish the utility model discloses an assembly of battery module.

Simultaneously the utility model discloses after the group battery accomplished the life in first stage, the retirement utilized the stage to the echelon. The battery pack may be disassembled in the following order:

(1) taking out the small wedge-shaped block 1, (2) dismounting the wedging force of the large wedge-shaped block 2, (3) integrally taking out the current conducting plate 8 and the conducting elastic sheet 3, (4) dismounting the battery pack cover 8 and the heat conducting plate 7, (5) loosening the fixing bolt, dismounting the end plates 9 and 10, separating the electric core 6 and other components, (6) dismounting the fixing support 4, and respectively storing the electric core 6. The battery cell 6 can be repaired or reused.

The utility model discloses electric core structure's repair method. The battery cell 6 is subjected to charging and discharging treatment, capacity grading and grouping are carried out, and then the battery cell is discharged to the cut-off voltage of 2.75 or the cut-off voltage value which does not damage the battery theoretically. The liquid is mended in groups on the purpose-built notes liquid machine again, seals, puts the back, and the partial volume carries out again according to the utility model discloses a mode assembly, uses.

From the above, the original assembly manufacturing process comprises lamination, welding, packaging (packaging film forming, top sealing, side sewing), drying, liquid injection, pre-sealing, formation, primary sealing, air bag cutting, fine sealing, edge folding, capacity grading, aging and warehousing;

the utility model discloses the technology of structure electricity core does: lamination-welding-packaging (top sealing-side sealing) -drying-injecting liquid-pre-sealing-formation-air-pumping final sealing (keeping air bag as large as possible) -shaping-capacity grading-aging-warehousing. Except that the finished airbag remains in the assembly process.

To sum up, the embodiment of the utility model provides a solved soft-packing electric core with utmost point ear welding on the busbar when in groups to cause permanent fixed, can't implement electric core level when echelon utilizes and utilize. Meanwhile, a new battery cell structure and an assembly process are adopted, the heat conduction of the bottom of the flexible package battery cell and the liquid supplementing function before echelon utilization are achieved, and the use cycle times of echelon utilization are prolonged. The utility model discloses the module structure is suitable for the soft-packaged electric core of all thin-sheet formula utmost point ears.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a but secondary prosthetic flexible package battery module structure, includes electric core body (6), and electric core body (6) are including anodal and negative pole, its characterized in that:

the battery pack is characterized by also comprising a small wedge-shaped block (1), a large wedge-shaped block (2), a conductive elastic sheet (3), a fixed support (4), a heat conducting plate (7), a battery pack cover (8) and a conductive plate (11) for connection between the cells;

the conductive elastic sheet (3) is inserted on a tab (5) of the cell body (6), and the fixed support (4) is arranged at the positive end or the negative end of the cell body (6);

the two ends of the battery cell body (6) are provided with end plates in parallel, the end plates comprise a first end plate (9) and a second end plate (10), and the first end plate (9), the second end plate (10) and the fixed support (4) are sequentially fixed to form a module;

the heat conduction plate (7) is fixed at the bottom of the two end plates;

the large wedge-shaped blocks (2) are sequentially inserted into the wedge-shaped holes of the fixed support (4);

the small wedge-shaped blocks (1) are sequentially wedged into one end of the large wedge-shaped block (2) and wedged into the fixed support (4), so that the large wedge-shaped block (2) is wedged into a fixed position, and the conductive elastic sheet (3) is tightly pressed on the lug (5) by means of the wedging force of the wedge-shaped blocks;

placing the current-conducting plate (11) between the electric cores between the electric core bodies (6), tightly attaching the current-conducting plate to the electric-conducting elastic sheet (3), and welding the current-conducting plate to the electric-conducting elastic sheet (3);

and (4) arranging the air bags of the battery cells in the same direction, and fastening a battery pack cover (8).

2. The secondarily repairable flexibly packaged battery module structure according to claim 1, wherein:

the conductive elastic sheet (3) is made by folding copper foil into a U shape and then flattening; the lug of the battery cell is inserted between the two layers of copper foils and tightly pressed close to the lug under the pressure of the large wedge-shaped block (2).

3. The secondarily repairable flexibly packaged battery module structure according to claim 2, wherein: the conductive elastic sheet (3) is made by folding a copper foil with the thickness of 0.3-1 mm into a U shape and then flattening.

4. The secondarily repairable flexibly packaged battery module structure according to claim 1, wherein: and the conductive elastic sheet (3) is punched with salient points which are contacted with the lugs (5).

5. The secondarily repairable flexibly packaged battery module structure according to claim 4, wherein: the diameter of the salient points is 0.5-3 mm, and the number of the salient points is 50-150.

6. The secondarily repairable flexibly packaged battery module structure according to claim 1, wherein:

the small wedge-shaped block (1) is made of aluminum and plastic;

the large wedge-shaped block (2) is made of metal aluminum materials, copper materials and plastics;

the fixing support (4) is made of plastic.

7. The secondarily repairable flexibly packaged battery module structure according to claim 1, wherein:

heat conduction grease or heat conduction gasket is smeared between the bottom surfaces of the heat conduction plate (7) and the electric core body (6), and meanwhile, the vibration buffering effect is achieved.

8. The secondarily repairable flexibly packaged battery module structure according to claim 1, wherein:

and the conductive plate (11) between the electric cores and the conductive elastic sheet (3) are fixed in a laser welding mode.