CN218919117U - Polymer cell group - Google Patents

Abstract

The utility model relates to a polymer battery cell group, which comprises a bottom plate, a top plate, a pull plate and at least one battery cell. The bottom plate, the top plate and the pulling plate are enclosed to form a frame structure; the cells are encased in the frame structure. The frame structure wraps the battery cells or the battery cells of a plurality of battery cells, under the action of the pulling force of the pulling plate, the bottom plate and the top plate can apply certain pressure to the battery cells, the battery cells can be orderly arranged without using bonding materials, displacement does not occur, and meanwhile, the expansion space of the battery cell group can be well controlled, so that the battery cell interface is compact, and the battery cell recycling service life is guaranteed.

Description

Polymer cell group

Technical Field

The utility model relates to the technical field of electric cores, in particular to a polymer electric core group.

Background

The polymer lithium ion battery core generally adopts an aluminum plastic film as a packaging material, and the structural strength of the polymer lithium ion battery core is far lower than that of a cylindrical battery or a square aluminum shell battery, so that the polymer lithium ion battery core is less applied to the field of new energy.

The common grouping method of the polymer lithium ion battery cells comprises the following steps: the first method is to combine the battery cell and the bonding buffer material into a battery cell module, the bonding buffer material required by the scheme is required to have a wide temperature resistant range, the bonding performance of the bonding buffer material is not changed substantially at a low temperature of-20 ℃ or even-40 ℃, the bonding buffer material cannot be hardened into a solid, otherwise, the hardened bonding buffer material can form a sharp point, and the battery cell is punctured or damaged in the process of charging and discharging expansion of the battery. In a high-temperature environment at 60 ℃ or even 80 ℃, the bonding buffer material can also bond the battery cell, so that the battery cell is ensured not to slide in use under various working conditions. Such an adhesive buffer material requires such high cost, and the battery cells cannot be disassembled and recycled by using the material. The second method is to arrange the battery cell in a plastic bracket and connect the battery cell to form a module through the bracket. The corresponding plastic mould is arranged on each cell, and the mould cost is high. And the plastic brackets are grouped, so that the size space is relatively large, and various wastes are caused. The two schemes reserve excessive expansion spaces for the polymer battery cells, the battery cycle increasing process is actually a thickness expansion increasing process, the excessive expansion spaces cause loose battery cell interfaces, the service life of the battery in cycle use is reduced, and the expected service life cannot be reached.

For this reason, it is highly desirable to provide a polymer cell stack that has a well controlled expansion space to meet the manufacturing requirements.

Disclosure of Invention

In view of the above, the present utility model aims at overcoming the drawbacks of the prior art, and its primary objective is to provide a polymer battery cell set, which can well control the expansion space of the battery cell set, and ensure the service life of the battery cell, so as to overcome the drawbacks of the prior art.

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

the application provides a polymer battery cell group, which comprises a bottom plate, a top plate, a pull plate and at least one battery cell; the pull plate is connected with the bottom plate and the top plate, and the bottom plate, the top plate and the pull plate form a frame structure; the battery cell is wrapped in the frame structure; the pull plates are penetrated with strip-shaped through holes, and a space is reserved between every two adjacent pull plates.

Preferably, the cells are stacked together into a cell module; at least one end of the battery cell module is provided with a base plate.

Preferably, the pull plate comprises a first pull plate and three second pull plates; mounting notches are formed in three side surfaces of the bottom plate and the top plate respectively; the end parts of the second pull plates are fixed at the corresponding mounting notches; the upper and lower ends of the first pulling plate are correspondingly fixed on one side surface of the bottom plate and the top plate.

Preferably, two through holes are formed in the first pull plate, and the tabs of the battery core are exposed from the two through holes.

Preferably, a space is reserved between the first pull plate and the body of the battery cell.

Preferably, one side edge of the bottom plate and one side edge of the top plate are extended with a flange; the flange is located on the first pulling plate side.

Preferably, the outer sides of the bottom plate and the top plate are respectively provided with a reinforcing grid.

Preferably, the pad is an elastic pad.

Preferably, the bottom plate, the top plate and the pulling plate are metal plates or plastic plates.

Preferably, the pulling plate is an elastic plate.

Compared with the prior art, the utility model has obvious advantages and beneficial effects, and particularly, the technical scheme shows that the polymer battery cell group comprises a bottom plate, a top plate, a pull plate and at least one battery cell. The frame structure wraps the battery cells or the battery cells of a plurality of battery cells, under the action of the pulling force of the pulling plate, the bottom plate and the top plate can apply certain pressure to the battery cells, the battery cells can be orderly arranged without using bonding materials, displacement does not occur, and meanwhile, the expansion space of the battery cell group can be well controlled, so that the battery cell interface is compact, and the cycle service life of the battery is ensured.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model.

FIG. 2 is another angular schematic view of FIG. 1 according to an embodiment of the present utility model.

FIG. 3 is a schematic side view of an embodiment of the present utility model.

FIG. 4 is an exploded view of an embodiment of the present utility model.

FIG. 5 is another angular schematic view of FIG. 4 in accordance with an embodiment of the utility model.

The attached drawings are used for identifying and describing:

10. bottom plate 11, top plate

12. Flange 13, backing plate

14. Cell 15, through hole

16. First pull plate 17, second pull plate

18. Mounting notch 19, reinforcing grid

20. Cell module 21 and cell

22. And a tab.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 5, a specific structure of a preferred embodiment of the present utility model is shown, which is a polymer cell set.

The frame structure can limit the battery cells 21 and simultaneously give certain pressure to the battery cell module 20, the frame structure enables the battery cells 21 to be orderly arranged without displacement, and meanwhile, the expansion space of the battery cell module 21 can be well controlled, so that the interface of the battery cells 21 is compact, the cycle service life of the battery is guaranteed, the manufacturing cost is lower, and the battery is safer.

Referring to fig. 1-5, the present application provides a polymer battery cell set, which includes a bottom plate 10, a top plate 11, a pull plate, and at least one battery cell 21; the pull plate is connected with the bottom plate 10 and the top plate 11, and the bottom plate 10, the top plate 11 and the pull plate form a frame structure; the battery cells 21 are wrapped in the frame structure; the pull plates are penetrated with strip-shaped through holes 15, and a space is reserved between the adjacent pull plates. One or more of the cells 21 are stacked together and placed into a frame structure. The frame structure limits the side surface of the battery cell module 20, the end part of the battery cell module 20 is tightly pressed by the bottom plate 10 and the top plate 11, and the expansion space of the polymer battery cell module can be well controlled, so that the interface of the battery cell 21 is compact, the cycle service life of the battery is ensured, the safety is higher, and the manufacturing cost is lower. The adjacent pull plates are spaced, which is also beneficial to the inspection of the cell module 20, and the deformation condition of the cell module 20 can be directly observed, and the weight is also beneficial to reduction. Preferably, at least one end of the cell module 20 is provided with a backing plate 13. The spacer 13 helps to further compensate for the space between the bottom plate 10, top plate 11 and cell module 20. The pad 13 has a certain elasticity, and the pad 13 is preferably a rubber insulation pad 13. The existence of the backing plate 13 enables the expansion space of the cell module 20 to be changed within a certain value, which is more beneficial to improving the safety and guaranteeing the service life. Preferred assembly steps for the polymer cell stack: placing a bottom plate 10, wherein the bottom plate 10 is connected with the pulling plate by screws; placing the battery cell 21; placing a backing plate 13; placing the top plate 11 and applying a certain pressure to the top plate 11 and the pulling plate; the pulling plate is connected with the top plate 11 through screws; and finally, assembling the polymer cell group. In addition, the pull plate and the bottom plate 10 and the top plate 11 may be fixed by rivets, bolts, or the like.

Referring to fig. 4, the pull plate preferably includes a first pull plate 16 and three second pull plates 17; mounting notches 18 are formed on three side surfaces of the bottom plate 10 and the top plate 11 respectively; the end parts of the second pull plates 17 are fixed at the corresponding mounting notches 18; the upper and lower ends of the first pull plate 16 are respectively fixed to one of the side surfaces of the bottom plate 10 and the top plate 11. The end of the second pull plate 17 is fixed at the corresponding mounting notch 18, so that the second pull plate 17 and the side surfaces of the bottom plate 10 and the top plate 11 are flush, positioning is facilitated, the firmness of assembly is increased, and assembly is more convenient.

Preferably, two through holes 15 are provided on the first pull plate 16, and the tab 22 of the battery cell 21 is exposed from the two through holes 15. The through holes 15 can effectively reduce the weight of the first and second pull plates 16 and 17. The through holes 15 can also improve the structure of the first pull plate 16 and the second pull plate 17, and after the through holes 15 are formed on the first pull plate 16 and the second pull plate 17 relative to the complete plate-shaped structure, the elastic recovery capability of the through holes is better, the previous shape can be recovered better, and the capability of dynamically controlling the expansion space is better and stronger. The first pull plate 16 is provided with two through holes 15, so that the tab 22 of the battery cell 21 is exposed, and the tab 22 of the battery cell 21 is conveniently connected with multiple purposes.

Preferably, a space is left between the first pull plate 16 and the body of the cell 21. This design prevents the first pull plate 16 from pulling away the distance between the first pull plate and the insulating film seal of the cell 21, and prevents the first pull plate from being pressed against the seal of the cell 21 to affect the position of the tab 22.

Preferably, one side of the bottom plate 10 and the top plate 11 extends to form a flange 12; the flange 12 is located on the side of the first pulling plate 16. The flange 12 can reserve a connection space between the first pull plate 16 and the housing, and can further protect the tab 22 of the battery core 21 and prevent the tab 22 from being offset.

Preferably, the outer sides of the bottom plate 10 and the top plate 11 are provided with reinforcing grids 19. The reinforcing mesh 19 may be rectangular, square, circular, parallelogram, or the like. The reinforcing grid 19 prevents deformation of the bottom plate 10 and the top plate 11 and improves the load carrying capacity thereof.

Preferably, the bottom plate 10, the top plate 11 and the pulling plate are metal plates or plastic plates.

Preferably, the pulling plate is an elastic plate. The pulling plate is preferably a rubber plate or a plastic plate, has elasticity, and is insulated.

The polymer cell group in the application has at least the following advantages: 1. when the battery is developed, the battery cell is changed into a module, the module can be used as a structural member, the vulnerability of the structure of the polymer battery cell is changed, and meanwhile, the infinite expansibility of the battery cell module is realized, and the battery cell module can be connected in series and parallel to realize the free combination of voltage and capacity. 2. When the battery is used, the battery core is held under the pre-compression, the fitting degree of the positive electrode interface and the negative electrode interface of the battery core is improved, the interface is optimized, the consumption of electrolyte is reduced, the cycle performance of the battery is improved, and in actual use, the pre-compression module is adopted, so that the cycle life is prolonged by more than one time. 3. When the battery is recovered, the battery core module can be disassembled, then the battery core module can be recycled secondarily, the battery core can also be disassembled, the battery core can be recycled secondarily, and the degree of freedom of recycling is enlarged.

In summary, the key point of the design of the utility model is that the battery core module 20 can arrange the battery cores 21 neatly under the action of the frame structure without displacement, and can well control the expansion space of the battery core 21 group, so that the interface of the battery cores 21 is compact, the cycle service life of the battery is ensured, the manufacturing cost is lower, and the battery is safer. In addition, the frame structure makes the recovery of electric core 21 also more convenient, is favorable to the resource recycling.

The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (10)

1. A polymer cell stack characterized by: the battery cell comprises a bottom plate, a top plate, a pull plate and at least one battery cell; the pull plate is connected with the bottom plate and the top plate, and the bottom plate, the top plate and the pull plate form a frame structure; the battery cell is wrapped in the frame structure; the pull plates are penetrated with strip-shaped through holes, and a space is reserved between every two adjacent pull plates.

2. The polymer cell stack of claim 1, wherein: the battery cells are stacked together to form a battery cell module; at least one end of the battery cell module is provided with a base plate.

3. The polymer cell stack of claim 1, wherein: the pull plate comprises a first pull plate and three second pull plates; mounting notches are formed in three side surfaces of the bottom plate and the top plate respectively; the end parts of the second pull plates are fixed at the corresponding mounting notches; the upper and lower ends of the first pulling plate are correspondingly fixed on one side surface of the bottom plate and the top plate.

4. A polymer cell stack according to claim 3, characterized in that: two through holes are formed in the first pull plate, and the lugs of the battery cell are exposed from the two through holes.

5. The polymer cell stack of claim 3 or 4, wherein: and a space is reserved between the first pull plate and the body of the battery cell.

6. A polymer cell stack according to claim 3, characterized in that: a flange extends from one side of the bottom plate and one side of the top plate; the flange is located on the first pulling plate side.

7. The polymer cell stack of claim 1, wherein: the outer side of the bottom plate and the top plate is provided with reinforcing grids.

8. The polymer cell stack of claim 2, wherein: the backing plate is an elastic backing plate.

9. The polymer cell stack of claim 1, wherein: the bottom plate, the top plate and the pulling plate are metal plates or plastic plates.

10. The polymer cell stack of claim 1 or 9, wherein: the pulling plate is an elastic plate.

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