Insulating film, pin structure and battery

Abstract

The utility model provides an insulating film, a pin structure and a battery, the insulating film comprises an insulating film body and a colloid, the insulating film body comprises a first insulating part and a second insulating part; the colloid is arranged on the first insulating part, and the colloid is configured to connect the first insulating part and the pin; according to the technical scheme of the utility model, the first insulating part is provided with the colloid, so that the first insulating part in the insulating film body and the pin are relatively fixed, and the colloid is not arranged on the second insulating part of the insulating film body, so that the first insulating part and the pin in the insulating film body are relatively fixed. When the first insulating part is bonded to the pin through the colloid, the insulating film body can generate elastic deformation, and the second insulating part can be naturally attached to the pin along the surface of the pin, so that the technical problem of poor attaching effect or attaching failure during attaching of the insulating film can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an insulating film, a pin structure and a battery. Background Art

[0002] A pin film is pasted on the side of the battery cell where the pin contacts the core package to prevent the pin from contacting the core package and causing a short circuit inside the battery. Since the pin is set in an L shape, the pin has two contact surfaces that contact the core package and intersect with each other.

[0003] In the related art, glue is applied to the surface of the pin film that contacts the pin, so as to fix the pin film on the pin. The pasting process is to paste the pin film on the two contact surfaces of the pin in turn. However, such a setting will cause the pin film to be easily pulled when it is pasted to one contact surface of the pin and then to the other contact surface of the pin, thereby causing the pin film to have been pasted on the pin to have a poor fitting effect or even a failed fitting. Utility Model Content

[0004] The embodiments of the utility model provide an insulating film, a pin structure and a battery, which can improve the technical problem in the related art that the pin film is fully coated with glue and pasted to the pin, resulting in poor pasting effect or pasting failure of the pin film during the pasting process.

[0005] In a first aspect, an embodiment of the utility model provides an insulating film, comprising:

[0006] 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 to the first insulating portion, the first direction and the second direction being located on different planes and intersecting; and

[0007] The colloid is arranged on the first insulating part; the projection of the colloid on the insulating film body falls on the first insulating part and falls outside the second insulating part, and the colloid is configured to connect the first insulating part and the pin.

[0008] In one embodiment, the first insulating portion includes a first sub-portion and a second sub-portion connected to each other;

[0009] The colloid is arranged on the first sub-part, and the second insulating part is connected to the second sub-part.

[0010] In some embodiments, the length of the second sub-portion in the first direction is defined as L; wherein L satisfies: 0.5 mm ≤ L ≤ 2 mm.

[0011] In some embodiments, the insulating film body further includes a bent portion extending along a third direction, one end of the bent portion is connected to the first insulating portion in the first direction, the other end of the bent portion is connected to the second insulating portion in the second direction, and the cross section of the bent portion perpendicular to the third direction is arc-shaped;

[0012] The third direction is perpendicular to the first direction and the second direction.

[0013] In some embodiments, a bending line extending along the third direction is provided on the bending portion.

[0014] In some embodiments, the curved portion is provided with a notch on at least one side in the third direction;

[0015] The notch is arranged on the bending line.

[0016] In some embodiments, a projection of the colloid on the insulating film body also falls outside the curved portion.

[0017] In some embodiments, the thickness of the first insulating portion in the second direction is defined as D1, and the thickness of the colloid in the second direction is defined as D2; wherein D1 and D2 satisfy: 0.5D1≤D2≤0.75D1.

[0018] In some embodiments, D1 also satisfies: 0.1 mm ≤ D1 ≤ 0.3 mm.

[0019] In a second aspect, an embodiment of the utility model provides a pin structure, including:

[0020] an insulating film, the insulating film comprising the insulating film as described above; and

[0021] A pin, wherein the pin comprises a pole connection portion and a tab connection portion connected to each other, one of the pole connection portion and the tab connection portion extends along the first direction, and the other extends along the second direction;

[0022] Wherein, the first insulating part is connected to the pole connecting part through the colloid, or the first insulating part is connected to the pole lug connecting part through the colloid.

[0023] In one embodiment, a projection of the pin on the insulating film body completely falls on the insulating film body.

[0024] In a third aspect, an embodiment of the utility model provides a battery, comprising the pin structure as described above.

[0025] Beneficial effects of the embodiments of the utility model:

[0026] In the technical solution of the utility model, the first insulating part and the pin in the insulating film body are relatively fixed by providing the colloid on the first insulating part, and since the colloid is not provided on the second insulating part of the insulating film body, when the first insulating part is bonded to the pin through the colloid, since the insulating film body can undergo elastic deformation, the second insulating part will naturally adhere to the pin along the surface of the pin; compared with the related art in which the contact parts between the pin and the pin film (i.e., the insulating film body) are all bonded with glue, since glue is not provided on the second insulating part in the present application, the second insulating part in the present application will not pull the first insulating part when in contact with the pin, thereby avoiding the technical problem of poor bonding effect or bonding failure when the insulating film is bonded. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a three-dimensional schematic diagram of an insulating film provided by an embodiment of the utility model;

[0029] Figure 2 is a three-dimensional schematic diagram of an insulating film provided by another embodiment of the utility model;

[0030] Figure 3 It is a partial exploded schematic diagram of a battery provided in an embodiment of the utility model;

[0031] Figure 4 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0032] Figure 5 It is a schematic structural diagram of an insulating film provided by an embodiment of the utility model;

[0033] Figure 6 It is a schematic diagram of the assembly of the insulating film and the pins provided in the embodiment of the utility model;

[0034] Figure 7 yes Figure 1 A magnified schematic diagram of point B in the middle.

[0035] Reference numerals:

[0036] 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. Colloid; 3. Bending line; 4. Notch; 5. Pin; 51. Pole connecting part; 52. Tab connecting part; 6. Core package; 7. Top cover assembly; 8. Pole; 9. Lead-out side; 10. Tab. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0038] A pin film is pasted on the side of the battery cell where the pin contacts the core package to prevent the pin from contacting the core package and causing a short circuit inside the battery. Since the pin is set in an L shape, the pin has two contact surfaces that contact the core package and intersect with each other.

[0039] In the related art, glue is applied to the surface of the pin film that contacts the pin, so as to fix the pin film on the pin. The pasting process is to paste the pin film on the two contact surfaces of the pin in turn. However, such a setting will cause the pin film to be easily pulled when it is pasted to one contact surface of the pin and then to the other contact surface of the pin, thereby causing the pin film to have been pasted on the pin to have a poor fitting effect or even a failed fitting.

[0040] In view of this, the utility model proposes an insulating film. Figures 1 to 7 Some embodiments of the utility model are shown in the figures, where the X direction is the first direction, the Y direction is the third direction, and the Z direction is the second direction.

[0041] See also Figures 1 to 3In some embodiments, the insulating film 100 includes an insulating film body 1, the insulating film body 1 includes a first insulating portion 11 and a second insulating portion 12, the first insulating portion 11 extends along a first direction X, the second insulating portion 12 extends along a second direction Z, and is connected to the first insulating portion 11, and the first insulating portion 11 and the second insulating portion 12 are located in different planes; wherein the first insulating portion 11 and the second insulating portion 12 are both in contact with the pin 5, so that the insulating film body 1 can separate the pin 5 and the core package 6.

[0042] The pole connecting portion 51 is connected to the pole 8 on the top cover assembly 7 , and the pole ear connecting portion 52 is connected to the pole ear 10 on the core package 6 .

[0043] In some embodiments, the insulating film 100 further includes a colloid 2, which is disposed on the first insulating portion 11 and is configured to connect the first insulating portion 11 with the pin 5. The colloid 2 can achieve relative fixation between the insulating film body 1 and the pin 5.

[0044] In the technical solution of the present utility model, the first insulating part 11 and the pin 5 in the insulating film body 1 are relatively fixed by providing the colloid 2 on the first insulating part 11, and since the colloid 2 is not provided 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, since the insulating film body 1 can undergo elastic deformation, the second insulating part 12 will naturally adhere to the pin 5 along the surface of the pin 5; compared with the related art in which the contact parts between the pin 5 and the pin film (i.e., the insulating film body 1) are all bonded with glue, since no glue is provided on the second insulating part 12 in the present application, the second insulating part 12 in the present application will not pull the first insulating part 11 when in contact with the pin, thereby avoiding the technical problem of poor bonding effect or bonding failure when the insulating film 100 is bonded.

[0045] It should be noted that, since the pin 5 is arranged in an L-shape, including a pole connection part 51 and a pole lug connection part 52 which are vertically connected to each other, the parts are labeled with names in the embodiment of the present application for explanation. In the related art, after the first insulating part 11 is pasted with the pole connection part 51 or the pole lug connection part 52, when the second insulating part 12 is pasted with the pole lug connection part 52 or the pole connection part 51, the insulating film body 1 needs to be deformed to be pasted with the pole lug connection part 52 or the pole connection part 51, and this process easily causes pulling on the first insulating part 11; similarly, if the second insulating part 12 is provided with a colloid 2, during the pasting process of the first insulating part 11, it is also necessary to avoid the second insulating part 12 from contacting with the pin 5 to affect the pasting effect of the first insulating part 11. The above embodiment of the present application can effectively solve this technical problem.

[0046] Among them, the first insulating part 11 and the second insulating part 12 described in the above embodiments can be respectively in contact with one of the pole connection part 51 and the pole tab connection part 52; in one embodiment of the present application, the first insulating part 11 is connected to the pole connection part 51, and the second insulating part 12 is in contact with the pole tab connection part 52; in another embodiment of the present application, the first insulating part 11 is connected to the pole tab connection part 52, and the second insulating part 12 is in contact with the pole connection part 51.

[0047] In a specific embodiment of the present 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 pole tab connecting portion 52 .

[0048] In addition, since the tab connection portion 52 is in contact with the diaphragm of the core package 6, that is, in contact with the lead-out side 9 of the core package 6 on which the tab 10 is provided, the short circuit risk of this part is relatively small, so the length of the second insulating portion 12 in the second direction Z is not limited. Figure 1 to Figure 2 As shown, the second insulating portion 12 may partially cover the contact area between the pole tab connecting portion 52 and the core package 6, or may completely cover the contact area between the pole tab connecting portion 52 and the core package 6, which is not limited here.

[0049] Furthermore, since the connection between the pole connecting portion 51 and the pole lug connecting portion 52 on the pin 5 has a corner, in order to prevent the insulating film body 1 from pulling the pasting position between the first insulating portion 11 and the pole connecting portion 51 when bending at the corner, please refer to Figure 4In some embodiments of the present application, the first insulating portion 11 includes a first sub-portion 111 and a second sub-portion 112 connected to each other; wherein the colloid 2 is disposed on the first sub-portion 111, and the second insulating portion 12 is connected to the second sub-portion 112. That is, there is a certain distance between the coating position of the colloid 2 on the first insulating portion 11 and the bending position of the insulating film body 1 at the corner, thereby further avoiding the problem of poor adhesion between the insulating film body 1 and the pin 5 caused by pulling when the insulating film body 1 is bent.

[0050] See also Figure 5 In some embodiments of the present application, the length of the second sub-portion 112 in the first direction X is defined as L; wherein, L satisfies: 0.5mm≤L≤2mm. That is, setting L to satisfy this interval range can avoid the problem of pulling of the insulating film body 1 during pasting, and at the same time ensure the pasting effect of the insulating film body 1; if the L value is less than 0.5mm, during the pasting process, the first insulating portion 11 will be affected by the bending of the insulating film body 1 and thus pulled, thereby affecting the pasting efficiency of the insulating film body 1 and the pasting effect of the insulating film body 1; if the L value is greater than 2mm, the pasting effect of the insulating film body 1 at the corner of the pin 5 will be poor.

[0051] See also Figure 5 and Figure 6 The insulating film body 1 further includes a curved portion 13 extending along a third direction Y, one end of the curved portion 13 is connected to the first insulating portion 11 in the first direction X, and the other end of the curved portion 13 is connected to the second insulating portion 12 in the second direction Z, and the cross section of the curved 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 insulating film body 1 better fit the pin 5, the cross section of the curved portion 13 of the insulating film body 1 corresponding to the corner of the pin 5 is also arc-shaped. Specifically, one end of the curved portion 13 is connected to the second sub-portion 112 in the first direction X.

[0052] It can be understood that, since the insulating film body 1 is bent at the corner of the pin 5 along the shape of the corner, the bent portion 13 is also arranged in an arc shape.

[0053] In some embodiments of the present application, the projection of the colloid 2 on the insulating film body 1 also falls outside the bending portion 13. That is, in this embodiment, the bending portion 13 is not provided with the colloid 2, so as to prevent the colloid 2 located at the bending portion 13 from sticking to the pin 5 when the bending portion 13 is bent, thereby pulling the first insulating portion 11.

[0054] 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 portion 12 in the second direction Z, the better the fit between the bent portion 13 and the corner of the pin 5. Since the second insulating portion 12 is not provided with the colloid 2, when the core package 6 is connected to the pin 5, the bent portion 13 can still fit the corner of the pin 5 due to the abutment of the core package 6.

[0055] Please refer again Figure 5 In some embodiments of the present application, the thickness of the first insulating portion 11 in the second direction Z is defined as D1, and the thickness of the colloid 2 in the second direction Z is defined as D2; wherein, the D1 and the D2 satisfy: 0.5D1≤D2≤0.75D1. That is, in this embodiment, the thickness D2 of the colloid 2 is set to satisfy this interval range to ensure the adhesive performance of the colloid 2 and facilitate the operator to remove the insulating film body 1 from the pin 5. If the D2 value is less than 0.5D1, the adhesive performance of the colloid 2 is poor, and it is not easy to ensure the adhesive effect of the insulating film body 1 and the pin 5; if the D2 value is greater than 0.75D1, when the insulating film body 1 is removed from the pin 5, the colloid 2 is likely to remain on the pin 5.

[0056] Furthermore, in some embodiments of the present application, the D1 also satisfies: 0.1mm≤D1≤0.3mm. That is, in this embodiment, the value of D1 is set to satisfy this interval to ensure the insulation effect of the first insulating part 11. If the D1 value is less than 0.1mm, the insulation effect of the first insulating part 11 is poor; if the D1 value is greater than 0.3mm, the use cost of the insulating film body 1 will increase, and the size of the first insulating part 11 in the second direction Z will be 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. The value of D1 is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0057] It can be understood that, on the basis of satisfying 0.5D1≤D2≤0.75D1 and 0.1mm≤D1≤0.3mm., the D2 also satisfies: 0.05mm≤D2≤0.225mm. Among them, 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. The value of D2 is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0058] In some embodiments of the present application, a bending line 3 extending along the third direction Y is provided on the bending portion 13. That is, in this embodiment, the provision of the bending line 3 can facilitate the bending of the insulating film body 1 at the corner corresponding to the pin 5. The provision form of the bending line 3 is not limited, and the bending line 3 may be formed by providing an indentation on the bending portion 13, or by providing a thinning area on the bending portion 13 when producing the insulating film body 1 to form the bending line 3.

[0059] See also Figure 7 The bending portion 13 is provided with a notch 4 on at least one side in the third direction Y; the notch 4 is provided on the bending line 3. The notch 4 is provided to facilitate an operator or an operating device to locate the position of the bending line 3, so that the position of the bending line 3 corresponds to the corner position of the pin 5.

[0060] It should be noted that the number and shape of the notches 4 are not limited. In one embodiment, the notch 4 is provided at one end of the bending line 3; in another embodiment, the notch 4 is provided at both ends of the bending line 3. The shape of the notch 4 can be arc, triangle, etc.

[0061] The utility model also proposes a pin structure, which includes an insulating film 100 and a pin 5. The insulating film 100 is as described in the above embodiment. The pin 5 includes a pole connection part 51 and a pole tab connection part 52 that are connected to each other. One of the pole connection part 51 and the pole tab connection part 52 extends along the first direction X, and the other extends along the second direction Z.

[0062] In some embodiments of the present application, the first insulating portion 11 is connected to the pole connecting portion 51 through the colloid 2, or the first insulating portion 11 is connected to the pole tab connecting portion 52 through the colloid 2. That is, the first insulating portion 11 can be connected to the pole connecting portion 51 or the pole tab connecting portion 52, and correspondingly, the second insulating portion 12 is in contact with the pole tab connecting portion 52 or the pole connecting portion 51.

[0063] See also Figure 3 In a specific embodiment of the present 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 pole tab connecting portion 52 . That is, in this embodiment, by providing the colloid 2 on the first insulating part 11, the relative fixation of the first insulating part 11 and the pole connecting part 51 in the insulating film body 1 is achieved. Since the second insulating part 12 on the insulating film body 1 is not provided with the colloid 2, when the first insulating part 11 is bonded to the pole connecting part 51 through the colloid 2, since the insulating film body 1 can undergo elastic deformation, the second insulating part 12 will naturally adhere to the pole lug connecting part 52 along the surface of the pin 5. 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 glued, when the second insulating part 12 in this embodiment contacts the pole lug connecting part 52 on the pin 5, since no glue is provided on the second insulating part 12, the first insulating part 11 will not be pulled, thereby avoiding the technical problem of poor bonding effect or bonding failure when the insulating film 100 is bonded.

[0064] It can be understood that, in another embodiment of the present application, the technical solution in which the first insulating part 11 is connected to the pole lug connecting part 52 and the second insulating part 12 is in contact with the pole connecting part 51 also has the technical effects described above, which will not be repeated here.

[0065] In one embodiment of the present application, the projection of the pole connecting portion 51 in 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 package 6, thereby preventing the pin 5 from contacting the core package 6 and causing a short circuit.

[0066] In another embodiment of the present application, the projection of the tab connection portion 52 in the first direction X completely falls on the second insulating portion 12. That is, the second insulating portion 12 completely separates the tab connection portion 52 and the core package 6, thereby preventing the pin 5 from contacting the core package 6 and causing a short circuit.

[0067] To ensure the insulation effect between the pin 5 and the core package 6, the present application has at least one of the above two embodiments. Figure 6 In a preferred embodiment of the present application, the sizes of the first insulating part 11 and the second insulating part 12 are both larger than the sizes of the pole connecting part 51 and the pole ear connecting part 52, that is, the projection of the pin 5 on the insulating film body 1 completely falls on the insulating film body 1, thereby avoiding short circuit between the pin 5 and the core package 6.

[0068] The utility model also proposes a battery, which includes a pin structure. The pin structure is as described above. Since the battery adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0069] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An insulating film, characterized in that: include: 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 to the first insulating portion, the first direction and the second direction being located on different planes and intersecting; and The colloid is arranged on the first insulating part; the projection of the colloid on the insulating film body falls on the first insulating part and falls outside the second insulating part, and the colloid is configured to connect the first insulating part and the pin.

2. The insulating film according to claim 1, wherein The first insulating portion includes a first sub-portion and a second sub-portion connected to each other; The colloid is arranged on the first sub-part, and the second insulating part is connected to the second sub-part.

3. The insulating film according to claim 2, characterized in that The length of the second sub-portion in the first direction is defined as L; wherein L satisfies: 0.5 mm ≤ L ≤ 2 mm.

4. The insulating film according to claim 1, wherein The insulating film body further includes a bent portion extending along a third direction, one end of the bent portion is connected to the first insulating portion in the first direction, the other end of the bent portion is connected to the second insulating portion in the second direction, and the cross section of the bent portion perpendicular to the third direction is arc-shaped; The third direction is perpendicular to the first direction and the second direction.

5. The insulating film according to claim 4, characterized in that The bending portion is provided with a bending line extending along the third direction.

6. The insulating film according to claim 5, characterized in that The bent portion is provided with a notch on at least one side in the third direction; The notch is arranged on the bending line.

7. The insulating film according to claim 4, characterized in that The projection of the colloid on the insulating film body also falls outside the curved portion.

8. The insulating film according to any one of claims 1 to 7, characterized in that: The thickness of the first insulating portion in the second direction is defined as D1, and the thickness of the colloid in the second direction is defined as D2; wherein D1 and D2 satisfy: 0.5D1≤D2≤0.75D1.

9. The insulating film according to claim 8, characterized in that The D1 also satisfies: 0.1 mm ≤ D1 ≤ 0.3 mm.

10. A pin structure, characterized in that: include: An insulating film, the insulating film comprising the insulating film according to any one of claims 1 to 9; and A pin, wherein the pin comprises a pole connection portion and a tab connection portion connected to each other, one of the pole connection portion and the tab connection portion extends along the first direction, and the other extends along the second direction; Wherein, the first insulating part is connected to the pole connecting part through the colloid, or the first insulating part is connected to the pole lug connecting part through the colloid.

11. The pin structure according to claim 10, characterized in that: The projection of the pin on the insulating film body completely falls on the insulating film body.

12. A battery, characterized in that: Comprising the pin structure as claimed in claim 11.

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