Insulating film, pin structure, and battery

Abstract

An insulating film (100), a pin structure, and a battery. The insulating film (100) comprises an insulating film body (1) and an adhesive (2); the insulating film body (1) comprises a first insulating part (11) and a second insulating part (12); the first insulating part (11) extends in a first direction; the second insulating part (12) extends in a second direction and is connected to the first insulating part (11); the adhesive (2) is arranged on the first insulating part (11); the projection of the adhesive (2) on the insulating film body (1) falls on the first insulating part (11) and falls outside the second insulating part (12); and the adhesive (2) is configured to connect the first insulating part (11) and a pin (5).

Description

Insulating film, pin structure and battery

[0001] This application claims priority to the Chinese patent application No. 202420792501.7 filed on April 16, 2024 with the Chinese Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to an insulating film, a pin structure and a battery. BACKGROUND

[0003] The pin sticker film is pasted on the side of the pin that contacts the core package, so as to prevent the pin from contacting the core package and causing internal short circuit of the battery. Since the pin is arranged in an L shape, the pin has two contact surfaces that contact the core package and intersect with each other.

[0004] In the related art, the pin sticker film is fixed on the pin by applying glue on the surface of the pin sticker film that contacts the pin, and the pasting process is to paste the pin sticker film on the two contact surfaces of the pin in sequence. SUMMARY

[0005] However, this arrangement may cause the pasted part of the pin sticker film to be pulled when pasting the pin sticker film on the other contact surface of the pin after pasting the pin sticker film on one contact surface of the pin, thereby resulting in poor or failed pasting of the pin sticker film on the pin.

[0006] In a first aspect, the present application provides an insulating film, comprising:

[0007] an insulating film body, the insulating film body comprising a first insulating portion and a second insulating portion, the first insulating portion extending along a first direction, the second insulating portion extending along a second direction and connected with the first insulating portion, the first direction and the second direction being on different planes and intersecting each other; and

[0008] a glue body disposed on the first insulating portion, a projection of the glue body on the insulating film body falling on the first insulating portion and outside the second insulating portion, the glue body being configured to connect the first insulating portion and the pin.

[0009] In a second aspect, the present application provides a pin structure, comprising:

[0010] an insulating film; and

[0011] a pin, the pin comprising a pole post connecting portion and a tab connecting portion connected with each other, one of the pole post connecting portion and the tab connecting portion extending along a first direction, and the other extending along a second direction;

[0012] wherein the first insulating portion is connected with the pole post connecting portion through the glue body, or the first insulating portion is connected with the tab connecting portion through the glue body.

[0013] In a third aspect, the present application provides a battery comprising the pin structure. Advantages

[0014] In the technical solution of the present application, the first insulating part of the insulating film body is fixed relative to the pin by being provided with the gel. Since the gel is not provided on the second insulating part of the insulating film body, when the first insulating part is bonded to the pin by the gel, the second insulating part will naturally fit along the surface of the pin due to the elastic deformation of the insulating film body. Compared with the related art in which the contact part between the pin and the pin film (i.e. the insulating film body) is bonded by using glue, since the second insulating part in the present application is not provided with glue, the second insulating part in the present application will not pull the first insulating part when it is in contact with the pin, thereby avoiding poor or failed bonding between the insulating film body and the pin due to pulling during bonding. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a perspective view of an insulating film according to an embodiment of the present application;

[0016] FIG. 2 is a perspective view of an insulating film according to another embodiment of the present application;

[0017] FIG. 3 is a partial exploded view of a battery according to an embodiment of the present application;

[0018] FIG. 4 is an enlarged view of A in FIG. 1;

[0019] FIG. 5 is a structural view of an insulating film according to an embodiment of the present application;

[0020] FIG. 6 is an assembly view of an insulating film and a pin according to an embodiment of the present application;

[0021] FIG. 7 is an enlarged view of B in FIG. 1.

[0022] REFERENCE NUMERALS

[0023] 100, insulating film; 1, insulating film body; 11, first insulating part; 111, first sub-part; 112, second sub-part; 12, second insulating part; 13, bending part; 2, gel; 3, bending line; 4, notch; 5, pin; 51, pole post connecting part; 52, tab connecting part; 6, core package; 7, top cover assembly; 8, pole post; 9, lead-out side; 10, tab. Embodiments of the present application

[0024] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0026] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish the description and have no special meaning.

[0027] The present application provides an insulating film, Figs. 1 to 7 are some embodiments of the present application. Among them, as shown by the direction mark in the drawing, the X direction is the first direction, the Y direction is the third direction, and the Z direction is the second direction.

[0028] Please refer to Figs. 1 to 3, in some embodiments, the insulating film 100 includes an insulating film body 1, the insulating film body 1 includes a first insulating part 11 and a second insulating part 12, the first insulating part 11 extends along the first direction X, the second insulating part 12 extends along the second direction Z, and is connected with the first insulating part 11, the first insulating part 11 and the second insulating part 12 are located in different planes; wherein the first insulating part 11 and the second insulating part 12 are in contact with the pin 5, so that the insulating film body 1 can separate the pin 5 and the core package 6.

[0029] Among them, the pole post connecting part 51 on the pin 5 is connected with the pole post 8 on the top cover assembly 7, and the tab connecting part 52 is connected with the tab 10 on the core package 6.

[0030] In some embodiments, the insulating film 100 further comprises a colloid 2, the colloid 2 is arranged on the first insulating part 11, and the colloid 2 is configured to connect the first insulating part 11 and the pin 5. The colloid 2 can realize relative fixation of the insulating film body 1 and the pin 5.

[0031] In the technical solution of the present application, the colloid 2 is arranged on the first insulating part 11 to realize relative fixation of the first insulating part 11 in the insulating film body 1 and the pin 5. Since the colloid 2 is not arranged on the second insulating part 12 of the insulating film body 1, when the first insulating part 11 is bonded to the pin 5 through the colloid 2, the second insulating part 12 can naturally adhere to the pin 5 along the surface of the pin 5 due to the elastic deformation of the insulating film body 1. Compared with the related art in which the contact part between the pin 5 and the pin film (i.e., the insulating film body 1) is bonded by glue, since no glue is arranged on the second insulating part 12 in the present application, the second insulating part 12 will not pull the first insulating part 11 when it contacts the pin, thereby avoiding poor bonding effect or bonding failure between the insulating film body 1 and the pin 5 due to pulling during bonding.

[0032] It should be noted that since the pin 5 is arranged in an L shape, including the pole connecting part 51 and the tab connecting part 52 connected perpendicularly to each other, in the related art, after the first insulating part 11 is pasted to the pole connecting part 51 or the tab connecting part 52, the second insulating part 12 is pasted to the tab connecting part 52 or the pole connecting part 51, and the insulating film body 1 needs to be deformed to be pasted to the tab connecting part 52 or the pole connecting part 51, which can easily pull the first insulating part 11. Similarly, if the colloid 2 is arranged on the second insulating part 12, the second insulating part 12 needs to avoid contacting the pin 5 during the pasting process of the first insulating part 11 to affect the pasting effect of the first insulating part 11. The technical solution in the embodiment of the present application can effectively solve this defect.

[0033] The first insulating part 11 and the second insulating part 12 can be in contact with one of the pole connecting part 51 and the tab connecting part 52, respectively. In an embodiment of the present application, the first insulating part 11 is connected to the pole connecting part 51, and the second insulating part 12 is in contact with the tab connecting part 52. In another embodiment of the present application, the first insulating part 11 is connected to the tab connecting part 52, and the second insulating part 12 is in contact with the pole connecting part 51.

[0034] Please refer to FIG. 3. In an embodiment of the present application, the first insulating part 11 is connected to the pole connecting part 51, and the second insulating part 12 is in contact with the tab connecting part 52.

[0035] In addition, since the tab connecting portion 52 is in contact with the diaphragm of the core package 6, that is, the lead-out side 9 of the core package 6 provided with the tab 10, the short circuit risk of this part is small, and therefore the length of the second insulation portion 12 in the second direction Z can be as shown in FIG. 1, the second insulation portion 12 can shield the contact area between the tab connecting portion 52 and the core package 6; the length of the second insulation portion 12 in the second direction Z can be as shown in FIG. 2, the second insulation portion 12 can also completely shield the contact area between the tab connecting portion 52 and the core package 6.

[0036] In addition, since the connecting portion of the pin 5 and the tab connecting portion 52 has a corner, in order to avoid the adhesive film body 1 being pulled when being bent at the corner position and affecting the pasting position of the first insulation portion 11 and the tab connecting portion 51, please refer to FIG. 4, in some embodiments of the present application, the first insulation portion 11 includes a first sub-portion 111 and a second sub-portion 112 connected to each other; wherein the adhesive 2 is arranged on the first sub-portion 111, and the second insulation portion 12 is connected to the second sub-portion 112. That is, the coating position of the adhesive 2 on the first insulation portion 11 is spaced apart from the bending position of the adhesive film body 1 at the corner, so as to avoid the adhesive film body 1 being pulled when being bent and affecting the pasting effect of the adhesive film body 1 and the pin 5.

[0037] Please refer to FIG. 5, in some embodiments of the present application, the length of the second sub-portion 112 in the first direction X is L; wherein L satisfies: 0.5mm≤L≤2mm. That is, setting L to satisfy the interval range of 0.5mm≤L≤2mm can avoid the adhesive film body 1 being pulled when being pasted, and at the same time can ensure the fitting effect between the adhesive film body 1 and the pin 5; if the value of L is less than 0.5mm, the first insulation portion 11 will be pulled due to the bending of the adhesive film body 1 during the pasting process, thereby affecting the pasting efficiency of the adhesive film body 1 and affecting the pasting effect of the adhesive film body 1; if the value of L is greater than 2mm, it will cause the poor fitting effect of the adhesive film body 1 at the corner of the pin 5.

[0038] Please refer to FIG. 5 and FIG. 6, the adhesive film body 1 further includes a bending portion 13 extending along a third direction Y, one end of the bending portion 13 is connected to the first insulation portion 11 in the first direction X, the other end of the bending portion 13 is connected to the second insulation portion 12 in the second direction Z, and the cross section of the bending portion 13 perpendicular to the third direction Y is arc-shaped; wherein since the corner of the pin 5 is arc-shaped, in order to make the adhesive film body 1 better fit the pin 5, the cross section of the bending portion 13 of the adhesive film body 1 corresponding to the corner of the pin 5 is also arc-shaped. One end of the bending portion 13 is connected to the second sub-portion 112 in the first direction X.

[0039] It can be understood that, since the insulating film body 1 is bent along the shape of the corner of the pin 5 at the corner, the bending part 13 formed is also arranged in an arc shape.

[0040] In some embodiments of the present application, the projection of the adhesive 2 on the insulating film body 1 also falls outside the bending part 13. That is, in this embodiment, the adhesive 2 is not arranged in the bending part 13, so as to avoid the adhesive 2 in the bending part 13 being pasted to the pin 5 when the bending part 13 is bent, thereby pulling the first insulating part 11 which has been pasted to the pin 5.

[0041] In addition, since the insulating film body 1 is bent at the corner of the pin 5, the smaller the length of the second insulating part 12 in the second direction Z, the better the fitting effect of the bending part 13 at the corner of the pin 5.

[0042] Since the second insulating part 12 is not provided with the adhesive 2, when the core package 6 is connected to the pin 5, the bending part 13 can still be fitted to the corner of the pin 5 under the abutting action of the core package 6.

[0043] Please refer to FIG. 5 again, in some embodiments of the present application, the thickness of the first insulating part 11 in the second direction Z is D1, and the thickness of the adhesive 2 in the second direction Z is D2; wherein D1 and D2 satisfy: 0.5D1≤D2≤0.75D1.

[0044] In this embodiment, the thickness D2 of the adhesive 2 satisfies the interval range of 0.5D1≤D2≤0.75D1, so as to ensure the pasting performance of the adhesive 2 and facilitate the removal of the insulating film body 1 on the pin 5 by the operator, if the value of D2 is less than 0.5D1, the pasting performance of the adhesive 2 is poor, and it is not easy to ensure the pasting effect of the insulating film body 1 and the pin 5; if the value of D2 is greater than 0.75D1, the adhesive 2 is easy to be left on the pin 5 when the insulating film body 1 is removed on the pin 5.

[0045] In some embodiments of the present application, D1 also satisfies: 0.1mm≤D1≤0.3mm. That is, in this embodiment, the value of D1 is set to satisfy the interval range of 0.1mm≤D1≤0.3mm to ensure the insulation effect of the first insulation part 11. If the value of D1 is less than 0.1mm, the insulation effect of the first insulation part 11 is poor. If the value of D1 is greater than 0.3mm, it will lead to an increase in the use cost of the insulation film body 1, and at the same time, the size of the first insulation part 11 in the second direction Z is too large, and it will also occupy the space requirement of the core package 6 in the second direction Z. The value of D1 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm.

[0046] It can be understood that, on the basis of simultaneously satisfying 0.5D1≤D2≤0.75D1 and 0.1mm≤D1≤0.3mm, D2 also satisfies: 0.05mm≤D2≤0.225mm. The value of D2 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.225mm.

[0047] In some embodiments of the present application, the bending part 13 is provided with a bending line 3 extending in the third direction Y. That is, in this embodiment, the bending line 3 is provided to facilitate the bending of the insulation film body 1 at the corner corresponding to the pin 5. The bending line 3 can be a pressure mark formed on the bending part 13, or a thinning area formed on the bending part 13 during the production of the insulation film body 1.

[0048] Referring to FIG. 7, the bending part 13 is provided with a notch 4 on at least one side in the third direction Y; the notch 4 is arranged on the bending line 3. The notch 4 is arranged to facilitate the positioning of the position of the bending line 3 by the operator or operating instrument, so as to correspond the position of the bending line 3 to the corner position of the pin 5.

[0049] In an embodiment of the present application, a notch 4 is arranged at one end of the bending line 3; in another embodiment of the present application, notches 4 are arranged at both ends of the bending line 3. The shape of the notch 4 can be arc-shaped, triangular, etc.

[0050] The application also provides a pin structure, which comprises an insulating film 100 and a pin 5. The insulating film 100 is as described above, and the pin 5 comprises a pole connecting portion 51 and a tab connecting portion 52 connected to each other, one of the pole connecting portion 51 and the tab connecting portion 52 extends along a first direction X, and the other one extends along a second direction Z.

[0051] In some embodiments of the application, the first insulating portion 11 is connected to the pole connecting portion 51 through the adhesive 2, or the first insulating portion 11 is connected to the tab connecting portion 52 through the adhesive 2. That is, the first insulating portion 11 can be connected to the pole connecting portion 51 or the tab connecting portion 52, and correspondingly, the second insulating portion 12 is in contact with the tab connecting portion 52 or the pole connecting portion 51.

[0052] In an embodiment of the application, the first insulating portion 11 is connected to the pole connecting portion 51, and the second insulating portion 12 is in contact with the tab connecting portion 52. That is, in this embodiment, the relative fixation of the first insulating portion 11 in the insulating film body 1 to the pole connecting portion 51 is achieved by providing the first insulating portion 11 with the adhesive 2. However, since the second insulating portion 12 on the insulating film body 1 is not provided with the adhesive 2, when the first insulating portion 11 is bonded to the pole connecting portion 51 through the adhesive 2, the insulating film body 1 can elastically deform, and the second insulating portion 12 can naturally fit on the tab connecting portion 52 along the surface of the pin 5. Compared with the related art in which the contact position between the pin 5 and the pin film (i.e., the insulating film body 1) is bonded by using glue, in the embodiment, since the second insulating portion 12 is not provided with glue when it is in contact with the tab connecting portion 52 on the pin 5, the second insulating portion 12 will not pull the first insulating portion 11, thereby avoiding poor bonding or bonding failure between the insulating film body 1 and the pin 5 due to pulling during bonding.

[0053] It can be understood that the technical solutions in which the first insulating portion 11 is connected to the tab connecting portion 52 and the second insulating portion 12 is in contact with the pole connecting portion 51 also have the technical effects described above, and details are not described herein.

[0054] In an embodiment of the application, a projection of the pole connecting portion 51 along the second direction Z completely falls on the first insulating portion 11. That is, the first insulating portion 11 completely separates the pole connecting portion 51 and the core wrap 6, thereby avoiding short circuit caused by contact between the pin 5 and the core wrap 6.

[0055] In another embodiment of the application, a projection of the tab connecting portion 52 along the first direction X completely falls on the second insulating portion 12. That is, the second insulating portion 12 completely separates the tab connecting portion 52 and the core wrap 6, thereby avoiding short circuit caused by contact between the pin 5 and the core wrap 6.

[0056] To ensure the insulation effect of the pin 5 and the core package 6, the application has at least one of the above two embodiments. Referring to FIG. 6, in an embodiment of the application, the sizes of the first insulation part 11 and the second insulation part 12 are greater than the sizes of the pole connecting part 51 and the tab connecting part 52, that is, the projection of the pin 5 on the insulation film body 1 completely falls on the insulation film body 1, thereby avoiding the pin 5 from contacting the core package 6 and short-circuiting.

[0057] The application also provides a battery, which comprises the pin structure as described above. Since the battery adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

Claims

1. An insulating film, comprising: an insulating film body (1) comprising a first insulating portion (11) extending along a first direction and a second insulating portion (12) extending along a second direction and connected with the first insulating portion (11), the first direction and the second direction being on different planes and intersecting each other; and a colloid (2) disposed on the first insulating portion (11), a projection of the colloid (2) on the insulating film body (1) falling on the first insulating portion (11) and outside the second insulating portion (12), the colloid (2) being configured to connect the first insulating portion (11) with a pin (5). The first insulating portion (11) comprises a first sub-portion (111) and a second sub-portion (112) connected with each other; 2. The insulating film according to claim 1, wherein wherein the colloid (2) is disposed on the first sub-portion (111), and the second insulating portion (12) is connected with the second sub-portion (112). A length of the second sub-portion (112) in the first direction is defined as L; wherein the L satisfies: 0.5 mm≤L≤2 mm.

3. The insulating film according to claim 2, wherein The insulating film body (1) further comprises a bending portion (13) extending along a third direction, one end of the bending portion (13) being connected with the first insulating portion (11) in the first direction, the other end of the bending portion (13) being connected with the second insulating portion (12) in the second direction, a cross section of the bending portion (13) perpendicular to the third direction being arc-shaped; 4. The insulating film according to claim 1, wherein The third direction is perpendicular to the first direction and the second direction. A bending line (3) extending along the third direction is disposed on the bending portion (13).

5. The insulating film according to claim 4, wherein At least one side of the bending portion (13) in the third direction is provided with a notch (4); 6. The insulating film according to claim 5, wherein The notch (4) is disposed on the bending line (3). The projection of the colloid (2) on the insulating film body (1) also falls outside the bending portion (13).

7. The insulating film according to claim 4, wherein A thickness of the first insulating portion (11) in the second direction is defined as D1, and a thickness of the colloid (2) in the second direction is defined as D2; wherein the D1 and the D2 satisfy: 0.5D1≤D2≤0.75D1.

8. The insulating film according to any one of claims 1 to 7, wherein The D1 further satisfies: 0.1 mm≤D1≤0.3 mm.

9. The insulating film according to claim 8, wherein 10.A pin structure, comprising: an insulating film comprising the insulating film according to any one of claims 1 to 9; and a pin (5) comprising a pole connecting portion (51) and a tab connecting portion (52) connected with each other, one of the pole connecting portion (51) and the tab connecting portion (52) extending along the first direction, and the other extending along the second direction; wherein the first insulating portion (11) is connected with the pole connecting portion (51) through the colloid (2), or the first insulating portion (11) is connected with the tab connecting portion (52) through the colloid (2). A projection of the pin (5) on the insulating film body (1) falls completely on the insulating film body (1). ​ 11. The pin structure of claim 10, wherein, ​ 12. A battery comprising the pin structure of claim 11.

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