Battery cell insulating film and battery
By designing the battery cell insulating film with an integrated molded structure, and setting a liquid inlet gap on the side edges, the problem of poor performance of the battery cell insulating film is solved, preventing powder from contacting the shell, improving the safety of the battery and the electrolyte infiltration effect .
Patent Information
- Application Number
- CN202420169382.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-23
AI Technical Summary
After collision and impact of the battery cell insulating film of the existing battery, the pole sheet powder may contact the shell through the gap, resulting in the shell corrosion and liquid leakage, and poor performance.
A battery cell insulating film is designed, which is an integrated molded structure, including four sides and bottom surfaces, and a liquid inlet notch is provided on the side edges. The accommodating cavity is connected to the outside through the assembly opening and the liquid inlet notch, so as to prevent the powder from contacting through the gap. Ensure the wetting effect of the electrolyte.
It effectively prevents the shell from corroding and leaking liquid, improves the service life and safety performance of the battery, and ensures sufficient electrolyte infiltration of the battery cell, significantly reducing the possibility of electrochemical corrosion between the powder and the shell.
Smart Images
Figure CN222338456U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a battery core insulating film and a battery. Background Art
[0002] During the battery packaging process, in order to prevent the core from directly contacting the shell and causing corrosion and leakage of the shell, the core will be wrapped with a cell insulation film. At the same time, in order to improve the wetting effect of the core in the electrolyte, a hole will be opened at the bottom of the cell insulation film. However, when using batteries or modules, collisions are inevitable. A certain degree of impact is likely to cause the powder on the pole piece to fall off. Since the general cell insulation film is wrapped with the core by connecting the side of the insulation film with tape, the bottom of the side of the cell insulation film is not integrated with the bottom of the cell insulation film. The fallen powder may contact the shell through the gap there, so the shell is still at risk of corrosion and leakage.
[0003] Therefore, the prior art has the problem of poor performance of the battery cell insulation film. Utility Model Content
[0004] The main purpose of the utility model is to provide a battery core insulating film and a battery, so as to solve the problem of poor performance of the battery core insulating film in the prior art.
[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cell insulating film is provided, including an insulating film body, the insulating film body is an integrally formed structure, including a first side surface, a second side surface, a third side surface, a fourth side surface and a bottom surface, the first side surface, the second side surface, the third side surface and the fourth side surface are connected end to end in sequence, and the first side surface, the second side surface, the third side surface and the fourth side surface are respectively connected to the bottom surface and form a accommodating cavity, and an assembly opening connected to the accommodating cavity is arranged at the top of the accommodating cavity; at least one side edge of the insulating film body has a liquid inlet notch.
[0006] Furthermore, the periphery of the liquid inlet notch is spaced apart from the bottom surface.
[0007] Furthermore, the distance from the liquid inlet notch to the end of the side edge close to the assembly opening is greater than the distance from the liquid inlet notch to the end of the side edge far from the assembly opening.
[0008] Furthermore, each side edge of the insulating film body has a liquid inlet notch.
[0009] Furthermore, the liquid inlet notches of different side edges have the same position in the vertical direction.
[0010] Furthermore, the liquid inlet notches of different side edges have different positions in the vertical direction.
[0011] Furthermore, at least one side edge of the insulating film body has a plurality of liquid inlet notches arranged at intervals along the length direction of the side edge.
[0012] Furthermore, the battery cell insulation film further comprises an insulation sheet, and the insulation sheet is arranged on a side of the bottom surface away from the assembly opening.
[0013] Furthermore, the first side surface and the third side surface have a first fold line and a second fold line, the first fold line is parallel to the side edge and divides the corresponding first side surface or third side surface into equal parts, there are two second fold lines, the two second fold lines are arranged at the end of the corresponding first side surface or third side surface away from the assembly opening and are symmetrically arranged about the first fold line, and there is an angle greater than 0 degrees between the first fold line and the second fold line; the second side surface and / or the fourth side surface has a third fold line at one end away from the assembly opening, both ends of the third fold line are respectively connected to the first side surface and the third side surface, and the third fold line is perpendicular to the side edge.
[0014] According to another aspect of the present invention, a battery is provided, comprising the above-mentioned battery cell insulation film.
[0015] When using the battery cell insulation film in the present application, the insulation film body 10 is set as an integrally formed structure, that is, all side surfaces and the bottom surface of the insulation film body 10 are an integrally formed structure, instead of the structure in the prior art in which the bottom surface of the battery cell insulation film is extended and folded from the side surface. Since the accommodating cavity is connected to the outside only through the assembly opening 20 and the liquid inlet notch 40, the problem that the powder dropped from the battery cell may contact the shell through the gap at the fold and cause the shell to be corroded and leak can be solved, thereby improving the service life and safety performance of the battery.
[0016] At the same time, a liquid inlet notch 40 is provided on the side edge 30 of the insulating film body 10 , and the electrolyte can enter the accommodating cavity through the liquid inlet notch 40 , so that the electrolyte infiltration effect of the battery cell can be ensured through the liquid inlet notch 40 . BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0018] Figure 1 A schematic structural diagram of a battery core insulating film according to a specific embodiment of the utility model is shown;
[0019] Figure 2 Shows Figure 1 A schematic diagram of the positional relationship between a first fold line and a second fold line of a cell insulation film;
[0020] Figure 3 Shows Figure 1Schematic diagram of the position of the third fold line of the battery cell insulation film.
[0021] The above drawings include the following reference numerals:
[0022] 10. Insulating film body; 20. Assembly opening; 30. Side edge; 40. Liquid inlet notch; 50. First fold line; 60. Second fold line; 70. Third fold line. DETAILED DESCRIPTION
[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0025] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0026] In order to solve the problem of poor performance of a battery cell insulation film in the prior art, the present application provides a battery cell insulation film and a battery.
[0027] Furthermore, the battery in the present application has the following cell insulating film.
[0028] like Figure 1 As shown, the battery cell insulation film in the present application includes an insulation film body 10, which is an integrally formed structure, including a first side surface, a second side surface, a third side surface, a fourth side surface and a bottom surface, wherein the first side surface, the second side surface, the third side surface and the fourth side surface are connected end to end in sequence, and the first side surface, the second side surface, the third side surface and the fourth side surface are respectively connected to the bottom surface and form a accommodating cavity, and an assembly opening 20 connected to the accommodating cavity is arranged at the top of the accommodating cavity.
[0029] At least one side edge 30 of the insulating film body 10 has a liquid inlet notch 40 .
[0030] When using the cell insulation film in the present application, since there is an insulation film body 10, the insulation film body 10 can prevent the battery cell from directly contacting the shell, thereby preventing the shell from corroding and leaking. The insulation film body 10 is an integrated structure, including a first side surface, a second side surface, a third side surface, a fourth side surface and a bottom surface, the first side surface, the second side surface, the third side surface and the fourth side surface are connected end to end in sequence, and the first side surface, the second side surface, the third side surface and the fourth side surface are respectively connected to the bottom surface and surround a receiving cavity, and an assembly opening 20 connected to the receiving cavity is provided at the top of the receiving cavity, so that the battery cell can be placed into the receiving cavity through the assembly opening 20, thereby realizing the coating of the battery cell by the insulation film body 10.
[0031] When using the battery cell insulation film in the present application, the insulation film main body 10 is set as an integrally formed structure, that is, all side surfaces and the bottom surface of the insulation film main body 10 are an integrally formed structure, instead of the structure in the prior art in which the bottom surface of the battery cell insulation film is extended and folded from the side surface. Since the accommodating cavity is connected to the outside only through the assembly opening 20 and the liquid inlet notch 40, the problem that the powder dropped from the battery cell may contact the shell through the gap at the folding part and cause the shell to be corroded and leak can be solved, thereby improving the service life and safety performance of the battery.
[0032] At the same time, a liquid inlet notch 40 is provided on the side edge 30 of the insulating film body 10 , and the electrolyte can enter the accommodating cavity through the liquid inlet notch 40 , so that the electrolyte infiltration effect of the battery cell can be ensured through the liquid inlet notch 40 .
[0033] Therefore, the insulating film body 10 in the present application is configured as a structure in which the four sides are integrally formed with the bottom surface, and a liquid inlet notch 40 is provided on its side edge 30, so as to prevent the shell from being corroded and ensure that the battery cell is fully infiltrated with the electrolyte. Therefore, the battery cell insulating film in the present application effectively solves the problem of poor performance of the battery cell insulating film in the prior art.
[0034] Optionally, the periphery of the liquid inlet notch 40 is spaced apart from the bottom surface.
[0035] When using the cell insulation film of the present application, by setting the periphery of the liquid inlet notch 40 apart from the bottom surface, it is further ensured that powder dropped from the cell cannot contact the shell through the liquid inlet notch 40, thereby more fully avoiding the problem of shell corrosion and leakage.
[0036] Optionally, the distance from the inlet notch 40 to the end of the side edge 30 close to the assembly opening 20 is greater than the distance from the inlet notch 40 to the end of the side edge 30 away from the assembly opening 20. This arrangement ensures that the electrolyte can more easily enter the interior of the accommodating cavity through the inlet notch 40.
[0037] Preferably, each side edge 30 of the insulating film body 10 has a liquid inlet notch 40 .
[0038] Optionally, the liquid inlet notches 40 of different side edges 30 are located at the same position in the vertical direction.
[0039] Optionally, the liquid inlet notches 40 of different side edges 30 are located at different positions in the vertical direction. This arrangement can effectively ensure that the electrolyte can more fully infiltrate the battery cell after entering the accommodating cavity.
[0040] Optionally, at least one side edge 30 of the insulating film body 10 has a plurality of liquid inlet notches 40 spaced apart along the length direction of the side edge 30. That is, when it is necessary to improve the wetting effect of the electrolyte on the battery cell, it can be achieved by providing a plurality of liquid inlet notches 40 on the same side edge 30.
[0041] Of course, in the above-mentioned embodiments of the present application, the liquid inlet notch 40 is only provided on the side edge 30 of the insulating film body 10 .
[0042] Optionally, the battery cell insulation film further comprises an insulation sheet, which is arranged on a side of the bottom surface away from the assembly opening 20. Such an arrangement can further effectively reduce the risk of powder leakage, thereby ensuring the protection effect of the battery housing.
[0043] Specifically, the insulating film body 10 includes a first side surface, a second side surface, a third side surface and a fourth side surface connected in sequence end to end, the first side surface and the third side surface have a first fold line 50 and a second fold line 60, the first fold line 50 is parallel to the side edge 30 and divides the corresponding first side surface or the third side surface into equal parts, there are two second fold lines 60, the two second fold lines 60 are arranged at the end of the corresponding first side surface or the third side surface away from the assembly opening 20 and are symmetrically arranged about the first fold line 50, and there is an angle greater than 0 degrees between the first fold line 50 and the second fold line 60; the second side surface and / or the fourth side surface has a third fold line 70 at one end away from the assembly opening 20, the two ends of the third fold line 70 are respectively connected to the first side surface and the third side surface, and the third fold line 70 and the side edge 30 are perpendicular to each other.
[0044] Since the insulating film body 10 in the present application is not in sheet form like a traditional battery cell insulating film but in pocket form, a fold line is set in the present application so that when the battery cell insulating film in the present application is stored, the battery cell insulating film can be folded and stored to reduce the space occupied by the battery cell insulating film.
[0045] In a specific embodiment of the present application, Figure 2 and Figure 3As shown, the specific folding method of the insulating film body 10 is: fold the side ADHE from the AD end along the center line RO to the inside of the one-piece battery cell insulating film with a notch, and then fold the EH side along the creases EO and HO respectively, and the side BCGF is also folded similarly. At this time, the side ADHE and the side BCGF are both recessed inward, and finally the bottom surface EFGH is folded along the crease XY. At this point, the one-piece battery cell insulating film with a notch can also be stored like an ordinary battery cell insulating film.
[0046] Of course, other fold lines may also be provided in the present application, so as to realize other folding methods of the insulating film body 10 , so as to reduce the space occupied when storing the battery cell insulating film.
[0047] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:
[0048] 1. The notched one-piece battery cell insulating film of the utility model has a side surface and a bottom surface that are integrated as a whole, which can effectively prevent the powder falling off the battery cell from contacting the shell, thereby improving the safety after the powder falls off. During the charging process of the battery cell, the winding core will expand, which may cause a gap at the bottom of the side of the battery cell insulating film. The powder falling off the winding core due to collision can easily contact the shell through the gap. Therefore, the notched one-piece battery cell insulating film can significantly reduce the possibility of electrochemical corrosion between the powder and the shell.
[0049] 2. The notched integrated battery cell insulation film of the utility model adds notches at the four edges of the battery cell insulation film near the bottom surface, which can enhance the electrolyte infiltration effect of the core roll. During liquid injection, the electrolyte can quickly enter the battery cell insulation film; therefore, the notched integrated battery cell insulation film can meet the wetting requirements of the core roll.
[0050] 3. The notched integrated battery insulating film of the utility model adopts a folding method tailored to its structural characteristics, and can achieve the design goal of the special structure while making the storage space requirement of this specially designed battery insulating film almost the same as that of ordinary battery insulating films.
[0051] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A battery core insulating film, characterized in that: The insulating film body (10) is an integrally formed structure, comprising a first side surface, a second side surface, a third side surface, a fourth side surface and a bottom surface, wherein the first side surface, the second side surface, the third side surface and the fourth side surface are connected end to end in sequence, and the first side surface, the second side surface, the third side surface and the fourth side surface are respectively connected to the bottom surface and enclose a receiving cavity, and an assembly opening (20) communicating with the receiving cavity is provided at the top of the receiving cavity; At least one side edge (30) of the insulating film body (10) has a liquid inlet notch (40).
2. The battery cell insulating film according to claim 1, characterized in that: The periphery of the liquid inlet notch (40) is spaced apart from the bottom surface.
3. The battery core insulating film according to claim 1, characterized in that: The distance from the liquid inlet notch (40) to the end of the side edge (30) close to the assembly opening (20) is greater than the distance from the liquid inlet notch (40) to the end of the side edge (30) far from the assembly opening (20).
4. The battery core insulating film according to claim 1, characterized in that: Each of the side edges (30) of the insulating film body (10) has a liquid inlet notch (40).
5. The battery core insulating film according to claim 1, characterized in that: The liquid inlet notches (40) of different side edges (30) are located at the same position in the vertical direction.
6. The battery core insulating film according to claim 1, characterized in that: The liquid inlet notches (40) of different side edges (30) have different positions in the vertical direction.
7. The battery core insulating film according to claim 1, characterized in that: At least one of the side edges (30) of the insulating film body (10) has a plurality of liquid inlet notches (40) arranged at intervals along the length direction of the side edge (30).
8. The battery cell insulating film according to any one of claims 1 to 7, characterized in that: The battery cell insulation film further comprises an insulation sheet, which is arranged on a side of the bottom surface away from the assembly opening (20).
9. The battery core insulating film according to any one of claims 1 to 7, characterized in that: The first side surface and the third side surface have a first fold line (50) and a second fold line (60), the first fold line (50) is parallel to the side edge (30) and divides the corresponding first side surface or the third side surface into equal parts, there are two second fold lines (60), the two second fold lines (60) are arranged at an end of the corresponding first side surface or the third side surface away from the assembly opening (20) and are symmetrically arranged about the first fold line (50), and the first fold line (50) and the second fold line (60) have an angle greater than 0 degrees; The second side surface and / or the fourth side surface has a third fold line (70) at one end away from the assembly opening (20), the two ends of the third fold line (70) are respectively connected to the first side surface and the third side surface, and the third fold line (70) is perpendicular to the side edge (30).
10. A battery, characterized in that: A battery cell insulating film comprising the battery cell insulating film according to any one of claims 1 to 9.