Insulating film and battery
By designing multiple insulating films in the battery and using the gaps between the film layers to absorb vibration, the problem of fatigue fracture caused by the vibration of the battery cell leading to the pins is solved, thus improving the battery's shock resistance and insulation performance.
Patent Information
- Application Number
- CN202423319029.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-31
AI Technical Summary
When the battery charge is low, the gap between the cell and the casing is large. When the battery vibrates, the cell causes the top cover pins to vibrate, which can lead to fatigue and breakage of the pins, affecting the battery's lifespan.
Design an insulating film comprising at least two film layers with gaps between them to absorb and disperse vibration forces. Utilize the buffering properties of the multilayer film to reduce the vibration and impact forces on the battery cell and prevent pin breakage.
The multi-layered buffer design reduces the damage to the pins caused by cell vibration, improves the battery's shock resistance, and reduces the risk of short circuit between the cell and the casing.
Smart Images
Figure CN223941976U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to an insulating film and a battery. Background Technology
[0002] In related technologies, an insulating film is placed between the battery cell and the casing to prevent direct contact and short circuit between the cell and the casing. However, when the battery capacity is low, the gap between the cell and the casing is large. The battery will vibrate during transportation or use. The cell will cause the pins on the top cover of the battery to vibrate, making the pins prone to fatigue fracture, which will lead to battery failure. Utility Model Content
[0003] The present invention provides an insulating film and a battery that can improve the technical problem of fatigue fracture of the battery top cover pins caused by the vibration of the battery cell.
[0004] In a first aspect, embodiments of the present invention provide an insulating film, the insulating film comprising:
[0005] At least one first film layer; and
[0006] At least one second membrane layer is located on one side of the first membrane layer in a first direction, and at least a portion of the second membrane layer is connected to the first membrane layer;
[0007] The second film layer is continuously disposed, and at least a portion of the second film layer is separated from the first film layer by a first gap.
[0008] In some embodiments, the second film layer includes:
[0009] At least one first sub-part is disposed at an angle relative to the first film layer;
[0010] In the first direction, the first sub-part and the first film layer are spaced apart from each other to form at least a portion of the first gap.
[0011] In some embodiments, the first sub-part is connected to the first membrane layer.
[0012] In some embodiments, in a first direction, the orthographic projections of two adjacent first sub-parts onto the first film layer do not overlap.
[0013] In some embodiments, the second membrane layer further includes:
[0014] At least one second sub-part, which connects two adjacent first sub-parts;
[0015] The second sub-section is inclined relative to the first membrane layer.
[0016] In some embodiments, the first sub-part includes a first end close to the first membrane layer and a second end far from the first membrane layer in a first direction;
[0017] In this configuration, between two adjacent first sub-parts, the two ends of the second sub-part are respectively connected to the first end of one first sub-part and the second end of the other first sub-part.
[0018] In some embodiments, in a first direction, the orthographic projection of the first sub-part onto the first film layer does not overlap with the orthographic projection of the second sub-part onto the first film layer.
[0019] In some embodiments, the insulating film further includes:
[0020] At least one third membrane layer is located on the side of the second membrane layer opposite to the first membrane layer and is connected to the second membrane layer;
[0021] In this embodiment, at least a portion of the second film layer is separated from the third film layer by a second gap.
[0022] In some embodiments, the insulating film includes:
[0023] Multiple insulating parts are connected to each other to separate the battery casing and the battery cell;
[0024] Each insulating part includes at least one first film layer and at least one second film layer.
[0025] Secondly, embodiments of this utility model provide a battery, the battery comprising:
[0026] case;
[0027] Battery cells; and
[0028] An insulating film is placed between the housing and the battery cell.
[0029] The beneficial effects of the embodiments of this utility model are as follows:
[0030] In an embodiment of this utility model, by forming a first gap between the first and second layers of the insulating film, when the battery vibrates, the insulating film absorbs and disperses the vibration force and impact force using the first gap, thereby reducing the vibration force and impact force on the battery cell and improving the situation where the pins are prone to fatigue fracture due to the vibration of the battery cell. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a cross-sectional schematic diagram of the insulating film provided in an embodiment of this utility model;
[0033] Figure 2 This is a schematic diagram of the structure of the insulating film provided in an embodiment of this utility model.
[0034] Explanation of reference numerals in the attached figures:
[0035] 100. Insulating film; 10. Insulating part; 101. First insulating part; 102. Second insulating part; 103. Third insulating part; 11. First film layer; 12. Second film layer; 121. First sub-part; 122. Second sub-part; 13. Third film layer; 2. First gap; 3. Second gap; 4. First end; 5. Second end. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0037] This application proposes an insulating film, Figures 1 to 2 These are some embodiments of the present application. As shown in the accompanying drawings, the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction. The first direction and the second direction intersect, and both the first direction and the second direction are perpendicular to the third direction. The following description uses the first direction X, the second direction Y, and the third direction Z.
[0038] Please see Figure 1 In some embodiments of this application, the insulating film 100 includes at least one first film layer 11 and at least one second film layer 12, the second film layer 12 being located on one side of the first film layer 11 in the first direction X, and at least a portion of the second film layer 12 being connected to the first film layer 11; that is, in this embodiment, the insulating film 100 is formed by stacking multiple film layers.
[0039] The number of the first film layer 11 and the second film layer 12 is not limited.
[0040] In one embodiment, both a first film layer 11 and a second film layer 12 are provided, that is, the second film layer 12 can be provided on any side of the first film layer 11 in the first direction X.
[0041] In another embodiment, there is one first film layer 11 and two second film layers 12, that is, the two second film layers 12 are respectively disposed on opposite sides of the first film layer 11 in the first direction X.
[0042] In another embodiment, two first film layers 11 are provided, and one second film layer 12 is provided, with the second film layer 12 located between the two first film layers 11.
[0043] In another embodiment, multiple first film layers 11 and multiple second film layers 12 are provided, and the multiple first film layers 11 and multiple second film layers 12 are staggered in the first direction X.
[0044] In some embodiments of this application, the second film layer 12 is continuously disposed, and at least a portion of the second film layer 12 and the first film layer 11 are spaced apart by a first gap 2; in this embodiment, by forming the first gap 2 inside the insulating film 100, the insulating film 100 has a buffering function.
[0045] The shape of the first gap 2 is not limited; it can be a triangle, a square, a circle, or an irregular shape.
[0046] In the technical solution of this application, by forming a first gap 2 between the first film layer 11 and the second film layer 12 of the insulating film 100, when the battery vibrates, the insulating film 100 absorbs and disperses the vibration force and impact force by utilizing the first gap 2, thereby reducing the vibration force and impact force on the battery cell, and improving the situation where the pins are prone to fatigue fracture due to the vibration of the battery cell.
[0047] Since the second film layer 12 is continuously arranged, the shape of the second film layer 12 can be changed or a groove can be provided on the side of the second film layer 12 close to the first film layer 11, so that the first film layer 11 and the second film layer 12 can form a first gap 2 after being connected.
[0048] In some embodiments of this application, at least a portion of the second film layer 12 is folded to form a first gap 2 between it and the first film layer 11.
[0049] Furthermore, it should be noted that since the insulating film 100 between the battery cell and the casing has at least two layers, namely the first film layer 11 and the second film layer 12, the thickness of the insulating film 100 is thicker than that of the insulating film layer in the related art. Therefore, in this embodiment, when the battery vibrates, the occurrence of short circuits between the casing and the battery cell caused by scratches on the insulating film 100 due to particles on the inner wall of the casing or the surface of the battery cell can be reduced.
[0050] In some embodiments of this application, the second film layer 12 further includes at least one first sub-part 121, which is inclined relative to the first film layer 11. In the first direction X, at least a portion of the first sub-part 121 is spaced apart from the first film layer 11 to form at least a portion of the first gap 2. In this embodiment, by providing the first sub-part 121 to be inclined relative to the first film layer 11, when the first film layer 11 is connected to the second film layer 12, at least a portion of the first sub-part 121 does not directly contact the first film layer 11, thereby forming at least a portion of the first gap 2. At the same time, when the battery vibrates, the first gap 2 can absorb and disperse the vibration force and impact force to play a buffering role, thereby improving the situation where the pins are prone to fatigue fracture due to the vibration of the battery cell.
[0051] In some embodiments of this application, the first sub-part 121 is connected to the first film layer 11; this arrangement can increase the size of the first gap 2, thereby improving the buffering capacity of the insulating film 100.
[0052] In some embodiments of this application, a plurality of first sub-parts 121 are arranged in the second direction Y; that is, in this embodiment, a plurality of first gaps 2 are formed in the insulating film 100, and because the second film layer 12 is integrally formed, the plurality of first gaps 2 are not connected to each other. While ensuring that the insulating film 100 has a certain strength, the entire insulating film 100 can play a buffering role, so as to avoid the situation where the battery cell drives the pin to vibrate and the pin to fatigue break due to the inability of the local insulating film 100 to play a buffering role.
[0053] Furthermore, the spacing between two adjacent first sub-parts 121 is not limited among the plurality of first sub-parts 121.
[0054] In one embodiment of this application, in the second direction Y, there is an overlapping portion between two adjacent first sub-parts 121.
[0055] In another embodiment of this application, there is no overlap between two adjacent first sub-parts 121 in the second direction Y.
[0056] In the second direction Y, when two adjacent first sub-parts 121 have overlapping portions or do not have overlapping portions, at least a portion of the first sub-parts 121 and the first film layer 11 are formed with a first gap 2, thereby enabling the insulating film 100 to perform a buffering function.
[0057] In some embodiments of this application, in the first direction X, the orthographic projections of two adjacent first sub-parts 121 on the first film layer 11 do not overlap; this arrangement ensures that the entire portion of each first sub-part 121 is directly opposite the first film layer 11 in the first direction X, thereby increasing the size of the first gap 2 and improving the buffering capacity of the insulating film 100.
[0058] It is understandable that if there is an overlap between two adjacent first sub-parts 121 in the first direction X, at least a portion of the first gap 2 will be formed between the two adjacent first sub-parts 121 and the first film layer 11. Since the two adjacent first sub-parts 121 are parallel to each other, the first gap 2 formed has two parallel sides. This makes the two first sub-parts 121 that enclose at least a portion of the first gap 2 easily deformed when the insulating film 100 is subjected to vibration and impact, which may lead to the insulating film 100 failing to play a buffering role.
[0059] In some embodiments of this application, the second film layer 12 further includes at least one second sub-part 122, which connects two adjacent first sub-parts 121; that is, in this embodiment, the two adjacent first sub-parts 121 are connected by the second sub-part 122 so that the second film layer 12 is continuously disposed.
[0060] It is understandable that since there are multiple first sub-parts 121 arranged in the second direction Y, there are also multiple second sub-parts 122 arranged in the second direction Y.
[0061] In some embodiments of this application, the first sub-part 121 includes a first end 4 near the first film layer 12 and a second end 5 away from the first film layer 11 in the first direction X; wherein, between two adjacent first sub-parts 121, the two ends of the second sub-part 122 are respectively connected to the first end 4 of one first sub-part 121 and the second end 5 of the other first sub-part 121; this arrangement allows the second film layer 12 to be folded and formed, which is more convenient for operators or tooling to process and form the insulating film 100.
[0062] In some embodiments of this application, the first end 4 of the first sub-part 121 is connected to the first film layer 11. Therefore, when the second sub-part 122 is connected to the first end 4, it is also connected to the first film layer 11. That is, the first sub-part 121, the second sub-part 122 and the first film layer 11 can form a triangular first gap 2. By utilizing the stability of the triangle, a certain structural support can be provided for the cells inside the battery when the battery vibrates.
[0063] Meanwhile, when the battery is fully charged and the cell expands, the insulating film 100, being made of a non-rigid material, can undergo a certain deformation, preventing the cell from being subjected to excessive pressure. At this time, the insulating film 100 and the expanded cell are tightly bonded together, further mitigating the vibration and impact forces on the cell.
[0064] In some embodiments of this application, the second sub-part 121 is inclined relative to the first film layer 11; in the first direction X, the orthographic projection of the first sub-part 121 on the first film layer 11 does not overlap with the orthographic projection of the second sub-part 122 on the first film layer 11; this arrangement allows the first sub-part 121, the second sub-part 122 and the first film layer 11 to form a larger first gap 2 in a triangular arrangement, so that the insulating film 100 can provide good buffering performance for the battery cell.
[0065] In some embodiments of this application, the insulating film 100 further includes at least one third film layer 13, which is located on the side of the second film layer 12 away from the first film layer 11 and is connected to the second film layer 12; wherein, at least a portion of the second film layer 12 and the third film layer are spaced apart by a second gap 3; by providing the first gap 2 and the second gap 3, the buffering performance of the insulating film 100 is improved.
[0066] The shapes and areas of the first gap 2 and the second gap 3 can be the same or different; no restrictions are imposed here.
[0067] In some embodiments of this application, the first sub-part 121 and the second sub-part 122 can form a first gap 2 between themselves and the first film layer 11, and also a second gap 3 between themselves and the third film layer 13. That is, the first sub-part 121 and the second sub-part 122 are connected to both the first film layer 11 and the third film layer 13.
[0068] In some embodiments of this application, at least one of the first film layer 11 and the third film layer 13 is arranged in a flat plate shape; this arrangement ensures that the surface of the insulating film 100 is flat, thereby avoiding the occurrence of bubbles, wrinkles or unevenness in some areas when the insulating film 100 is covering the battery cell, so as to reduce the risk of internal short circuit in the battery.
[0069] In some embodiments of this application, the insulating film 100 is made of polyethylene terephthalate.
[0070] In some embodiments of this application, the second film layer 12 is fused together with the adjacent first film layer 11 and third film layer 13 or integrally formed.
[0071] Furthermore, there is no limitation on the number of first film layer 11, second film layer 12 and third film layer 13 in the insulating film 100; it is sufficient to ensure that the insulating film 100 has at least one second film layer 12.
[0072] Please see Figure 2 In some embodiments of this application, the insulating film 100 includes a plurality of insulating portions 10, which are interconnected to separate the battery casing and the battery cell; wherein each insulating portion includes at least one first film layer 11 and at least one second film layer 12; this arrangement is such that the plurality of insulating portions are respectively disposed in the area where the battery cell and the casing can contact each other, thereby ensuring insulation between the casing and the battery cell.
[0073] Since each insulating part 10 includes at least one first film layer 11 and at least one second film layer 12, the insulating film 100 can buffer the battery cell.
[0074] In some embodiments of this application, each insulating portion 10 includes a first film layer 11, a second film layer 12 and a third film layer 13, so that the insulating portion 10 can buffer the battery cell while avoiding the occurrence of bubbles, wrinkles or unevenness in the local area of the insulating portion 10, thereby reducing the risk of internal short circuit in the battery.
[0075] There are no restrictions on the form in which multiple insulating parts 10 cover the battery cell, as long as the insulating film 10 can completely separate the battery cell and the casing.
[0076] In some embodiments of this application, the plurality of insulating portions 10 include a first insulating portion 101, two second insulating portions 102 and two third insulating portions 103. The two second insulating portions 102 are respectively located on both sides of the second insulating film 100 in the second direction Y and are connected to the first insulating portion 101; the two third insulating portions 103 are respectively located on both sides of the two second insulating portions 102 in the third direction Z and are connected to the second insulating portions 102. That is, in this embodiment, the insulating film 100 covers the battery cell by folding the second insulating portions 102 and the third insulating portions 103.
[0077] In some embodiments of this application, the first insulating part 101 has a dimension of L1 in the second direction Y, and the third insulating part 103 has a dimension of L2 in the third direction Z; wherein L1 and L2 satisfy: L1 < L2; this arrangement allows the third insulating part 103 to seal the gaps in the insulating film 100 after covering the battery cell, thereby improving the insulation performance of the insulating film 100.
[0078] It is understandable that, since the third insulating part 103 is connected to a second insulating part 102, when the insulating film 100 covers the battery cell, since L1 < L2, at least a portion of the third insulating part 103 can also overlap with another second insulating part 102, thereby sealing the gaps in the insulating film 100.
[0079] This application also proposes a battery, which includes a casing, a cell, and an insulating film 100, as described above. Since this battery adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0080] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. An insulating film, characterized in that, include: At least one first film layer; and At least one second film layer is located on one side of the first film layer in a first direction, and at least a portion of the second film layer is connected to the first film layer; The second film layer is continuously disposed, and at least a portion of the second film layer is separated from the first film layer by a first gap.
2. The insulating film according to claim 1, characterized in that, The second film layer includes: At least one first sub-part is disposed at an angle relative to the first film layer; In the first direction, the first sub-part and the first film layer are spaced apart to form at least a portion of the first gap.
3. The insulating film according to claim 2, characterized in that, The first sub-part is connected to the first membrane layer.
4. The insulating film according to claim 2, characterized in that, In the first direction, the orthographic projections of two adjacent first sub-parts onto the first film layer do not overlap.
5. The insulating film according to claim 4, characterized in that, The second film layer further includes: At least one second sub-part, wherein the second sub-part connects two adjacent first sub-parts; The second sub-section is inclined relative to the first film layer.
6. The insulating film according to claim 5, characterized in that, The first sub-part includes a first end close to the first membrane layer and a second end far from the first membrane layer in the first direction; In this configuration, between two adjacent first sub-parts, the two ends of the second sub-part are respectively connected to the first end of one first sub-part and the second end of the other first sub-part.
7. The insulating film according to claim 5, characterized in that, In the first direction, the orthographic projection of the first sub-part onto the first film layer does not overlap with the orthographic projection of the second sub-part onto the first film layer.
8. The insulating film according to any one of claims 1 to 7, characterized in that, The insulating film further includes: At least one third film layer is located on the side of the second film layer opposite to the first film layer and is connected to the second film layer; Wherein, at least a portion of the second film layer is spaced apart from the third film layer to form a second gap.
9. The insulating film according to any one of claims 1 to 7, characterized in that, The insulating film comprises: Multiple insulating portions, which are interconnected to separate the battery casing and the battery cell; Each of the insulating portions includes at least one first film layer and at least one second film layer.
10. A battery, characterized in that, include: case; Battery cell; and The insulating film as described in any one of claims 1 to 9, wherein the insulating film is disposed between the housing and the battery cell.