Battery monomer and battery pack

Abstract

The single battery comprises a box body and a plurality of single batteries, the single batteries are assembled in the box body, the battery pack comprises a shell, a battery cell, a coating film and a protective film, the battery cell is arranged in the shell, and the battery cell is provided with a bottom surface attaching area and a side surface attaching area which are adjacent to each other. The coating film comprises a bottom film and a side film which are connected with each other, the bottom film is attached to the bottom face attaching area, the side film is attached to the side face attaching area, and through holes are formed in the side film. And the protective film is coated on the battery cell and the coating film. The utility model solves the problem that the inside of the battery pack is corroded and short-circuited due to the powder falling phenomenon of the single battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery monomer and battery package. BACKGROUND

[0002] With the continuous expansion of the application field of lithium ion battery, lithium battery has rapidly become a new generation of energy storage solution, and is widely used in communication energy storage, power energy storage, hybrid electric vehicle and photovoltaic home energy storage and many other fields, and provides reliable power support for these applications. In the production process of lithium battery, the electric core inevitably suffers from bumping in the transfer process, which causes the phenomenon of active material falling off, which is easy to cause the contact between the falling off material and the shell, thereby causing internal corrosion short circuit and other safety hazards. SUMMARY

[0003] One purpose of the utility model is to provide a battery monomer and battery package, which aims to solve the technical problem that the monomer battery is prone to falling off phenomenon and causes internal corrosion short circuit of the battery package.

[0004] To achieve the above purpose, the utility model provides a kind of scheme: a kind of battery monomer, it is characterized by comprising: shell;

[0005] Electric core, electric core is set in shell, and electric core is provided with adjacent bottom surface bonding area and side bonding area;

[0006] Coating film, coating film includes mutually connected bottom film and side film, bottom film is attached to bottom surface bonding area, and side film is attached to side bonding area, and side film is provided with through hole;

[0007] Protective film, protective film is covered in electric core and coating film.

[0008] Optionally, side bonding area includes first bonding area and second bonding area, first bonding area, second bonding area and bottom surface bonding area are adjacent respectively, and the surface area of first bonding area corresponding to the side wall of electric core is less than the surface area of second bonding area corresponding to the side wall of electric core;

[0009] Side film includes first film and second film, first film is connected to second film, first film is attached to first bonding area, and second film is attached to second bonding area.

[0010] Optionally, through hole is set in first film and / or second film.

[0011] Optionally, when through hole is set in first film and second film, through hole is spaced apart in the direction parallel to bottom surface bonding area.

[0012] Optionally, when through hole is set in first film or second film, through hole is spaced apart in the direction perpendicular to bottom surface bonding area.

[0013] Optionally, a first fold is formed between the first film and the bottom film, and a second fold is formed between the first film and the second film.

[0014] Optionally, in a direction perpendicular to the bottom surface bonding area, the height of the side film is L1, and the height of the battery cell is L2, and 1 / 3≤L1 / L2≤1 / 2.

[0015] Optionally, in a length direction of the battery cell, the length of the battery cell is L3, and the length of the bottom film is L4, and 1 / 5≤L4 / L3≤1 / 4.

[0016] Optionally, in the length direction of the battery cell, the length of the second film is L5, and 10mm≤L5≤20mm.

[0017] Optionally, the battery cell comprises a connecting bonding area, and the connecting bonding area and the bottom surface bonding area jointly cover the bottom surface of the battery cell.

[0018] The cladding film comprises a connecting film, the connecting film is arranged in the connecting bonding area, the connecting film connects adjacent bottom films, and the through hole is further arranged in the connecting film and / or the bottom film.

[0019] To achieve the above-mentioned purpose, one scheme provided by the application is: a battery pack comprising a box body and a plurality of battery cells according to any one of the above-mentioned battery cells, and the plurality of battery cells are assembled in the box body.

[0020] The battery pack has the following beneficial effects:

[0021] The battery cell comprises a box body and a plurality of battery cells, the plurality of battery cells are assembled in the box body, the battery pack comprises an outer shell, a battery cell, a cladding film and a protective film, the battery cell is arranged in the outer shell, and the battery cell is provided with adjacent bottom surface bonding areas and side surface bonding areas. The cladding film comprises a bottom film and a side film connected with each other, the bottom film is arranged in the bottom surface bonding area, the side film is arranged in the side surface bonding area, and the side film is provided with a through hole. The protective film clads the battery cell and the cladding film.

[0022] The number of the cladding films is two, and the two cladding films are arranged on both ends of the battery cell respectively. The bottom film is adhered to the side wall of the battery cell covered by the bottom surface bonding area by using adhesive tape or adhesive paper, and the side film is adhered to the side wall of the battery cell covered by the side surface bonding area by using adhesive tape or adhesive paper. The side wall of the battery cell prone to powder dropping is cladded by the cladding film, so that the degree of powder dropping of the battery cell is improved. The area of the side film is large, and the through hole is arranged on the side film. The electrolyte can smoothly infiltrate the battery cell through the through hole without affecting the connection strength between the cladding film and the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0024] Figure 1 is a structural schematic diagram of the cladding film provided by the embodiment of the present application;

[0025] Figure 2 is a three-view diagram of the battery monomer provided by the embodiment of the present application;

[0026] Figure 3 is a structural schematic diagram for connecting the film provided by the embodiment of the present application;

[0027] Figure 4 is a cross-sectional structural schematic diagram for showing the battery monomer with the connected film provided by the embodiment of the present application.

[0028] Explanation of reference numerals:

[0029] 20, shell; 30, battery core; 31, bottom surface bonding area; 32, side surface bonding area; 321, first bonding area; 322, second bonding area; 33, connecting bonding area; 40, cladding film; 41, bottom film; 42, side film; 421, through hole; 422, first film; 423, second film; 43, first folding edge; 44, second folding edge; 45, connecting film; 50, protective film. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of the cladding film 40 provided by the embodiment of the present application, Figure 2 is a three-view diagram of the battery monomer provided by the embodiment of the present application.

[0032] The utility model discloses an implementation scheme provides a kind of battery pack, including box and multiple single batteries, single battery is assembled in box, battery pack includes shell 20, electric core 30, cladding film 40 and protective film 50, electric core 30 is set in shell 20, electric core 30 is provided with adjacent bottom surface bonding area 31 and side bonding area 32.

[0033] Electric core 30 is bent in the process of transportation or processing, and the particles of active material or material are easily detached from the bent part of electric core 30 to form powder. This phenomenon may cause the shell of the battery pack to contact the powder, resulting in internal corrosion and short circuit of the battery pack, thereby affecting the performance, stability and safety of the battery.

[0034] In practical application, the number of cladding film 40 is two, and the two cladding films 40 are respectively attached to the ends of electric core 30. The bottom film 41 is attached to the side wall of electric core 30 covered by the bottom surface bonding area 31 through adhesive tape or adhesive paper, and the side film 42 is attached to the side wall of electric core 30 covered by the side surface bonding area 32 through adhesive tape or adhesive paper. The side wall of electric core 30 prone to powder is covered by cladding film 40, thereby improving the degree of powder falling of electric core 30. The area of side film 42 is large, and a through hole 421 is formed in the side film 42. The electrolyte can smoothly penetrate the through hole 421 to soak electric core 30 without affecting the connection strength of cladding film 40 and electric core 30.

[0035] In the embodiment, electric core 30 can be a cuboid, bottom surface bonding area 31 includes part of the bottom wall of electric core 30, side wall bonding area includes part of the side wall with small surface area of electric core 30 and part of the side wall with large surface area of electric core 30. The material of cladding film 40 can be polyethylene, polypropylene, polyimide, etc.

[0036] Further, referring to Figure 1 and Figure 2 , side bonding area 32 includes first bonding area 321 and second bonding area 322, first bonding area 321, second bonding area 322 and bottom surface bonding area 31 are adjacent respectively, the surface area of side wall corresponding to first bonding area 321 is smaller than the surface area of side wall corresponding to second bonding area 322, side film 42 includes first film 422 and second film 423, first film 422 is connected to second film 423, first film 422 is attached to first bonding area 321, and second film 423 is attached to second bonding area 322.

[0037] In practical applications, the first bonding area 321 corresponds to the side wall of the battery cell 30 with a smaller surface area, and the second bonding area 322 corresponds to the two opposite side walls of the battery cell 30 with a larger surface area. Correspondingly, the side film 42 includes a first film 422 and two second films 423, the first film 422 is arranged between the two second films 423, and the bottom film 41 and the two second films 423 are respectively connected with the first film 422. The first film 422 is bonded to the side wall of the battery cell 30 corresponding to the first bonding area 321, and the two second films 423 are respectively bonded to the two opposite side walls of the battery cell 30 corresponding to the second bonding area 322. By reasonably configuring the first bonding area 321 and the second bonding area 322 with different areas, the best combination of the cladding film 40 and the battery cell 30 is ensured, thereby improving the overall performance and safety of the battery pack.

[0038] Further, referring to Figure 1 and Figure 2 , the through hole 421 is arranged on the first film 422 and / or the second film 423. Figure 1 and Figure 2 It is shown that the through hole 421 is arranged on the first film 422.

[0039] In practical applications, by arranging multiple through holes 421 on the first film 422 and the second film 423, the permeation channels of the electrolyte can be effectively increased, thereby improving the wettability of the battery cell 30. The interval arrangement of the through hole 421 ensures that the electrolyte is uniformly distributed on the surface of the battery cell 30, reduces the problem of lack of electrolyte caused by excessive local concentration, and further improves the overall performance and cycle life of the battery. In addition, the arrangement of the through hole 421 also helps to reduce the stress of the battery cell 30 during thermal cycling and reduce the risk of thermal runaway, thereby enhancing the safety of the battery.

[0040] Further, when the through hole 421 is arranged on the first film 422 and the second film 423, the through hole 421 is arranged in multiple intervals along a direction parallel to the bottom surface bonding area 31.

[0041] In practical applications, multiple through holes 421 are arranged on the first film 422 and the second film 423, and are arranged in multiple intervals along a direction parallel to the bottom surface bonding area 31, which can effectively increase the contact area and flow channel of the electrolyte, promote the uniform distribution of the electrolyte in the battery cell 30, and further improve the overall electrochemical performance of the battery cell 30. In addition, the arrangement of the through hole 421 can reduce the stress generated during the charging and discharging process of the battery cell 30, reduce the risk of gas accumulation, and thereby improve the safety and stability of the battery. By reasonable interval arrangement, the through hole 421 can effectively prevent the battery cell 30 from overheating and degrading, and improve the service life of the battery.

[0042] In this embodiment, the arrangement of the through holes 421 can be arranged along a rectangular array. It should be noted that the more the through holes 421 are opened, the lower the reliability of the adhesion of the first film 422 and the second film 423 to the battery cell 30, and the better the flow effect, pressure relief effect, and heat dissipation effect of the electrolyte.

[0043] Optionally, referring to Figure 2 When the through holes 421 are opened in the first film 422 or the second film 423, the through holes 421 are arranged in multiple along a direction perpendicular to the bottom surface bonding area 31.

[0044] In actual application, the through holes 421 are only opened in the first film 422 or the second film 423, which can improve the reliability of the adhesion of the side film 42 to the battery cell 30.

[0045] In this embodiment, the through holes 421 are opened in the first film 422, and the multiple through holes 421 are arranged along a rectangular array along a direction perpendicular to the bottom surface bonding area 31. In other embodiments, the through holes 421 can also be opened in the second film 423.

[0046] Optionally, referring to Figure 1 A first fold 43 is formed between the first film 422 and the bottom film 41, and a second fold 44 is formed between the first film 422 and the second film 423.

[0047] In actual application, the first fold 43 between the first film 422 and the bottom film 41 and the second fold 44 between the first film 422 and the second film 423 respectively form obvious positioning marks on the edges of the films and the battery cell 30, which ensures that the films maintain stable positions during assembly and use, thereby reducing the risk of displacement and deformation of the films.

[0048] The existence of the folds not only optimizes the alignment accuracy of the films, but also provides certain mechanical support during assembly, ensuring the close adhesion of the films to the battery cell 30. Such close adhesion helps to improve the air tightness and liquid tightness of the battery cell 30, prevent electrolyte leakage, and improve the overall performance and safety of the battery.

[0049] Optionally, referring to Figure 1 and Figure 2 Along a direction perpendicular to the bottom surface bonding area 31, the height of the side film 42 is L1, and the height of the battery cell 30 is L2, 1 / 3≤L1 / L2≤1 / 2.

[0050] In practical applications, setting the proportional relationship between the height L1 of the side film 42 and the height L2 of the battery cell 30 (1 / 3≤L1 / L2≤1 / 2) can effectively optimize the protection effect of the side film 42, ensuring that it covers the side wall of the battery cell 30 and forms a good protective layer. At the same time, this proportional relationship provides reliable adhesion strength, thereby significantly reducing the phenomenon of powder falling caused by the shedding of active materials. This design not only enhances the structural stability and safety of the battery, but also improves the overall performance and life of the battery cell 30 during use.

[0051] Optionally, referring to Figure 1 and Figure 2 , along the length direction of the battery cell 30, the length of the battery cell 30 is L3, and the length of the bottom film 41 is L4, 1 / 5≤L4 / L3≤1 / 4.

[0052] In practical applications, setting the proportional relationship between the length L4 of the bottom film 41 and the length L3 of the battery cell 30 (1 / 5≤L4 / L3≤1 / 4) can effectively improve the protection ability of the bottom film 41 to the battery cell 30. By reasonably controlling the length of the bottom film 41, it is ensured that it covers the bottom area of the battery cell 30, thereby forming a good sealing and protective layer to prevent powder falling.

[0053] This proportional relationship helps to enhance the adhesion strength between the bottom film 41 and the battery cell 30, ensuring the stability of the two during use and reducing the displacement of the film caused by physical vibration or external force.

[0054] Optionally, referring to Figure 1 and Figure 2 , along the length direction of the battery cell 30, the length of the second film 423 is L5, 10mm≤L5≤20mm.

[0055] In practical applications, by reasonably controlling the length of the second film 423, the adhesion strength between the film and the battery cell 30 can be improved, thereby reducing the risk of displacement and shedding of the film during use. This design helps to reduce the performance decline and safety hazards caused by the powder falling of the battery cell 30.

[0056] Optionally, referring to Figure 3 and Figure 4 , the battery cell 30 includes a connection bonding area 33, and the connection bonding area 33 and the bottom bonding area 31 jointly cover the bottom surface of the battery cell 30. The coating film 40 includes a connection film 45, the connection film 45 is arranged in the connection bonding area 33, the connection film 45 connects adjacent bottom films 41, and the through hole 421 is also provided in the connection film 45 and / or the bottom film 41.

[0057] In practical applications, by opening the through hole 421 on the connecting film 45 and the bottom film 41, the permeation of the electrolyte and the discharge of the gas can be further promoted, and the electrochemical performance of the battery cell 30 can be improved. At the same time, the arrangement of the connecting film 45 ensures the close combination of the coating film 40 and the battery cell 30, reduces the risk of film displacement and falling caused by external impact, and reduces the occurrence of the powder falling phenomenon of the battery cell 30.

[0058] In the embodiment, the two ends of the connecting film 45 are provided with the bottom film 41 and the side film 42, that is, the two bottom films 41 are connected with each other through the connecting film 45. When the coating film 40 is attached to the battery cell 30, the bottom film 41 and the connecting film 45 jointly cover the bottom wall of the battery cell 30.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0060] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element through a middle element.

[0061] In addition, the descriptions involving "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0062] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: shell; The battery cell is disposed in the housing and has adjacent bottom bonding area and side bonding area; A covering film, comprising a bottom film and a side film connected to each other, wherein the bottom film is adhered to the bottom surface adhesion area, and the side film is adhered to the side surface adhesion area, and the side film has through holes; A protective film, which covers the battery cell and the covering film.

2. The battery cell according to claim 1, characterized in that, The side bonding area includes a first bonding area and a second bonding area. The first bonding area, the second bonding area and the bottom bonding area are adjacent to each other. The surface area of ​​the first bonding area corresponding to the side wall of the battery cell is smaller than the surface area of ​​the second bonding area corresponding to the side wall of the battery cell. The side membrane includes a first membrane and a second membrane, the first membrane being connected to the second membrane, the first membrane being adhered to the first adhesion area, and the second membrane being adhered to the second adhesion area.

3. The battery cell according to claim 2, characterized in that, The perforation is formed in the first membrane and / or the second membrane.

4. The battery cell according to claim 3, characterized in that, When the through holes are formed in the first membrane and the second membrane, a plurality of through holes are provided at intervals along a direction parallel to the bottom bonding area.

5. The battery cell according to claim 3, characterized in that, When the through holes are formed in the first membrane or the second membrane, a plurality of through holes are provided at intervals along a direction perpendicular to the bottom bonding area.

6. The battery cell according to claim 2, characterized in that, A first fold is formed between the first film and the base film, and a second fold is formed between the first film and the second film.

7. The battery cell according to any one of claims 1 to 6, characterized in that, Along the direction perpendicular to the bottom bonding area, the height of the side film is L1, the height of the battery cell is L2, and 1 / 3≤L1 / L2≤1 / 2.

8. The battery cell according to any one of claims 1 to 6, characterized in that, Along the length direction of the battery cell, the length of the battery cell is L3, and the length of the bottom film is L4, where 1 / 5 ≤ L4 / L3 ≤ 1 / 4.

9. The battery cell according to any one of claims 2 to 6, characterized in that, Along the length of the battery cell, the length of the second membrane is L5, 10mm≤L5≤20mm.

10. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell includes a connection bonding area, and the connection bonding area and the bottom bonding area together cover the bottom surface of the battery cell; The covering film includes a connecting film, which is attached to the connecting and bonding area and connects to the adjacent bottom film. The through-hole is also formed in the connecting film and / or the bottom film.

11. A battery pack, characterized in that, It includes a housing and a plurality of battery cells as described in any one of claims 1-10, wherein the plurality of battery cells are assembled in the housing.

Images