Insulation protection film, naked battery cell, battery and battery pack
By designing an insulating protective film to cover the bottom, sides and top of the battery electrode group, the control ear edge is within the range of 15%≤G/H≤95%, which solves the problems of poor insulation performance of the electrode group and the susceptibility to damage to the ear, and achieves better insulation protection and welding effects.
Patent Information
- Application Number
- CN202422379199.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The lack of a unified coating method for battery pole sets in the prior art, resulting in poor insulation performance of the pole sets, and the extreme ears are susceptible to compression or interference, affecting ultrasonic welding.
An insulating protective film is designed to cover the bottom, length side, width side and top of the electrode group. The dimensions of the third part in the width direction are G, and the edges of the ear are H, 15%≤G/H≤95%, to ensure that the exterior of the ear on the outer side of the ear is as small as possible and avoid compression and interference.
The insulation performance of the electrode group is improved, prevents the electrode ear from being damaged, avoids interference between the insulation film and the electrode ear, and ensures the smooth progress of the ultrasonic welding of the electrode ear.
Smart Images
Figure CN223245873U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to an insulating protective film, a bare cell, a battery, and a battery pack. Background Art
[0002] During the production of bare battery cells, an insulating protective film is typically used to coat the electrode group to protect it and ensure its insulation performance. However, current technology lacks a unified coating method for the electrode group, so there is still room for improvement. Utility Model Content
[0003] In view of this, the present application provides an insulating protective film, a bare cell, a battery and a battery pack, the purpose of which is to solve the above technical problems to a certain extent.
[0004] The present application provides an insulating protective film, which is used to cover an electrode group, wherein the electrode group has an electrode ear located at the top, and the electrode group also has a length direction and a width direction. The insulating protective film includes:
[0005] A bottom portion, the bottom portion being used to cover the bottom portion of the electrode group;
[0006] two first areas, the two first areas being respectively located on both sides of the bottom in the width direction;
[0007] The first region includes a first portion and two second portions, the first portion being connected to a side portion of the bottom portion in the width direction, the two second portions being connected to two sides of the first portion in the length direction, and the first region further includes a third portion corresponding to each second portion, the third portion being connected to a side of the corresponding second portion away from the bottom portion in the width direction;
[0008] The first portion is used to cover the side of the electrode group in the width direction, the second portion is used to cover the side of the electrode group in the length direction, and the third portion is used to cover the top of the electrode group;
[0009] The first region further includes a fourth portion, the fourth portion being connected to a side of the first portion in the width direction away from the bottom portion, the side of the fourth portion connected to the first portion being smaller in the length direction than the side of the first portion connected to the fourth portion, such that the fourth portion is spaced apart from both third portions.
[0010] The dimension of the third portion in the width direction is G, the margin of the electrode tab of the electrode group is H, and 15%≤G / H≤95%.
[0011] Preferably, 55%≤G / H≤85%, the insulating protection film further includes two second regions, and the two second regions are respectively located on both sides of the bottom in the length direction.
[0012] Preferably, the dimension of the fourth portion in the width direction is E, the thickness of a single pole group is D1, 0.5ND1+2.5mm≤E≤ND1 mm, wherein N is the number of pole groups.
[0013] Preferably, the two third portions included in each of the first regions have different sizes in the width direction.
[0014] Preferably, the dimension of the second portion in the length direction is B, the thickness of a single pole group is D1, 0.5ND1+2.5mm≤B≤ND1 mm, wherein N is the number of pole groups.
[0015] Preferably, the two second portions included in each first region have different sizes in the length direction.
[0016] Preferably, the insulating protective film is adhered to the outer side of the electrode group.
[0017] A second aspect of the present application provides a bare battery cell, which includes the insulating protective film as described above.
[0018] A third aspect of the present application provides a battery, comprising the bare battery cell as described above.
[0019] A fourth aspect of the present application provides a battery pack, comprising a plurality of batteries as described above.
[0020] In this way, the insulating protective film provided in accordance with the embodiment of the present application can cover the bottom, sides in the length direction, sides in the width direction and top of the pole group, thereby forming insulating protection for the pole group. According to the insulating protective film provided in accordance with the embodiment of the present application, the dimension of the third part in the width direction is G, the margin of the pole ear of the pole group is H, 20%≤G / H≤90%, which is conducive to making the pole group part outside the pole ear exposed as small as possible, improving the insulation performance of the pole group after being covered by the insulating protective film, and preventing the pole piece located outside the pole ear from being crushed during assembly, and also avoiding interference between the insulating film and the pole ear, affecting the subsequent ultrasonic welding of the pole ear, and avoiding causing the pole ear to tear.
[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0023] Figure 1 A schematic diagram of an insulating film provided according to an embodiment of the present application is shown;
[0024] Figure 2 Another schematic diagram of an insulating film provided according to an embodiment of the present application is shown;
[0025] Figure 3 A schematic diagram showing an example of multiple pole groups provided according to an embodiment of the present application;
[0026] Figure 4 A schematic diagram showing an example of a single pole group provided according to an embodiment of the present application;
[0027] Figure 5 A schematic diagram showing another example of a single pole group provided according to an embodiment of the present application;
[0028] Figure 6 A schematic diagram showing another example of multiple pole groups provided according to an embodiment of the present application is shown.
[0029] Reference numerals:
[0030] 100 - insulating protective film; 110 - bottom; 111 - first region; 112 - first part; 113 - second part; 114 - third part; 115 - fourth part; 116 - second region; 120 - notch; 200 - pole group; 210 - pole ear; 300 - length direction; 400 - width direction. DETAILED DESCRIPTION
[0031] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.
[0032] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0034] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0035] According to a first aspect of the embodiment of the present application, an insulating protective film 100 is provided. Figures 1 to 6 The structure and working principle of the insulating protection film 100 will be described in detail.
[0036] According to the insulating protective film 100 provided in an embodiment of the present application, the insulating protective film 100 is used to cover the electrode group 200. The electrode group 200 has a pole ear 210 located at the top. The electrode group 200 also has a length direction 300 and a width direction 400. The insulating protective film 100 includes a bottom 110 and two first regions 111. In the embodiment, the bottom 110 is used to cover the bottom 110 of the electrode group 200, and the two first regions 111 are respectively located on both sides of the bottom 110 in the width direction 400.
[0037] In the embodiment, the first region 111 includes a first portion 112 and two second portions 113. The first portion 112 is connected to the side of the bottom 110 in the width direction 400, and the two second portions 113 are respectively connected to the two sides of the first portion 112 in the length direction 300. The first region 111 also includes a third portion 114 corresponding to each second portion 113. The third portion 114 is connected to the side of the corresponding second portion 113 away from the bottom 110 in the width direction 400. In the embodiment, the first portion 112 is used to cover the side of the electrode assembly 200 in the width direction 400, the second portion 113 is used to cover the side of the electrode assembly 200 in the length direction 300, and the third portion 114 is used to cover the top of the electrode assembly 200.
[0038] In an embodiment, the first area also includes a fourth part, which is connected to the side of the first part away from the bottom in the width direction, and the size of the side of the fourth part connected to the first part in the length direction is smaller than the size of the side of the first part connected to the fourth part in the length direction, so that the fourth part is spaced apart from the two third parts.
[0039] In an embodiment, the dimension of the third portion 114 in the width direction 400 is G, the margin of the electrode tab 210 of the electrode group 200 is H, and 15%≤G / H≤95%.
[0040] Thus, the insulating protective film 100 provided in the embodiment of the present application can cover the bottom 110, the side in the length direction 300, the side in the width direction 400, and the top of the electrode group 200, thereby forming an insulating protection for the electrode group 200. According to the insulating protective film 100 provided in the embodiment of the present application, the size of the third portion 114 in the width direction 400 is G, and the fourth portion is spaced apart from the third portion. Thus, the fourth portion cooperates with the third portion to cover the top of the electrode group 200, with the third portion being the main portion. The pole piece between the two tabs is protected, and the fourth part focuses on protecting the outer pole piece. The margin of the tab 210 of the pole group 200 is H, 15%≤G / H≤95%, which is conducive to making the portion of the pole group 200 outside the tab 210 exposed as small as possible, improving the insulation performance of the pole group 200 after being covered by the insulating protection film 100, and preventing the pole piece located outside the tab 210 from being crushed during assembly. It can also avoid interference between the insulating film and the tab 210, affecting the subsequent ultrasonic welding of the tab 210, and avoiding tearing of the tab 210.
[0041] like Figure 1 As shown, Figure 1 1 shows a schematic diagram of the insulating protective film 100, which is essentially a plan view of the insulating protective film 100. In the embodiment, Figure 1It can be understood as a view obtained by observing the insulating protective film 100 along the height direction of the electrode group 200. In this view, the insulating protective film 100 is observed in the "unfolded" state, that is, the state not yet coated on the electrode group 200. In the subsequent description of the embodiment of the present application, unless it is clearly stated that the insulating protective film 100 is coated on the electrode group 200, the rest of the description of the orientation is referred to. Figure 1 Examples in .
[0042] Continue to refer Figure 2 , Figure 2 Shown with Figure 1 The insulating protective film 100 is shown in FIG. Figure 2 In the figure, the specific areas and parts are not shown in detail, but the boundaries between the areas and parts are shown. Figure 1 See also Figure 2 Different regions and different parts within a region can be divided by notches 120. For example, the bottom 110 and the first regions 111 connected to both sides of the bottom 110 in the width direction 400 are divided by notches 120 along the length direction 300. Different parts within the first region 111, for example, the first part 112 and the second part 113, and the second part 113 and the third part 114 can both be divided by notches 120.
[0043] In the embodiment, the "notch 120" is essentially a "crease" between different areas and different parts. After the insulating protective film 100 is coated on the electrode group 200, the position corresponding to the notch 120 is exactly the "edge" of the electrode group 200. The "edge" referred to here is not limited to the edge of the rectangular structure, but should also be broadly understood as the intersection of adjacent sides of the electrode group 200.
[0044] In an embodiment, the notch 120 is located between different regions and between different portions. Compared to the regions or portions on both sides of the notch 120, the notch 120 may have a smaller thickness, so that one region can be rotated relative to the other region to achieve the purpose of covering the surface of the electrode assembly 200. In an embodiment, the smaller thickness of the notch 120 can be achieved by carving the insulating protective film 100. In other words, the notch 120 can be carved on the insulating protective film 100.
[0045] In other examples, the insulating protective film 100 may be folded repeatedly to produce the same Figure 1 and Figure 2 For the creases at the same position in the middle, it can also be understood that, through repeated folding, the thickness of the position where the crease is located is still smaller than the thickness of the areas or parts on both sides thereof.
[0046] In the embodiment, as an example, both ends of each score 120 may not be flush with the outer edge of the insulating protection film 100, or in other words, both ends of each score 120 are located at the outer edge of the insulating protection film 100. Figure 2 , and combined with Figure 1 Taking the first region 111 and the bottom 110 as an example, the notch 120 extending along the length direction 300 divides the two. However, both ends of the notch 120 in the length direction 300 do not reach the edge of the insulating protection film 100.
[0047] Therefore, in the embodiment, the setting of the notch 120 in the insulating protective film 100 is equivalent to "hiding" the notch 120. The advantage of this setting method is that, since the thickness of the notch 120 is relatively small, hiding the notch 120 is conducive to avoiding the situation in which, during the covering process, different areas or parts of the insulating protective film 100 are torn from the end of the notch 120 at the outer edge of the insulating protective film 100 to the inside of the insulating protective film 100 when pulling occurs between different areas or parts, causing damage to the insulating protective film 100 and failure of the insulating protective film 100 to protect the electrode group 200.
[0048] like Figure 1 As shown, in an embodiment, the bottom 110 and the first portion 112 and fourth portion 115 of the first region 111 can all be rectangular. In an embodiment, the first portion 112 of the first region 111 is connected to the long side of the bottom 110. As an example, the first portion 112 can be the same length as the long side of the bottom 110. Also as an example, the second portion 113, the third portion 114, and the second region 116 to be described later can all be trapezoidal or substantially trapezoidal.
[0049] As an example, the second portion 113 and the third portion 114 can each be, for example, substantially a right-angled trapezoid. A base of the second portion 113 is connected to the wide side of the first portion 112, and a right-angled side of the second portion 113 can be connected to a base of the third portion 114. The term "substantially a right-angled trapezoid" herein should be understood to mean that the second portion 113 and the third portion 114 are substantially in the shape of a right-angled trapezoid. In actual applications, the corners of the second portion 113 and the third portion 114 can be, for example, rounded, so that the second portion 113 and the third portion 114 are not strictly "right-angled trapezoids."
[0050] In the embodiment, according to the above description, combined with Figure 1 The dimension of the third portion 114 in the width direction 400 is substantially the height of the third portion 114 which is a substantially right-angled trapezoid. Figure 1 It has been specifically shown in .
[0051] In the embodiment, the third portion 114 covers the top of the electrode group 200 from one side of the top of the electrode group 200 in the width direction 400 to the top of the electrode group 200, that is, the edge of the third portion 114 facing away from the second portion 113, that is, the narrower bottom edge eventually faces the electrode ear 210 (see Figures 3 to 6 ).
[0052] In the embodiment, G / H is essentially the percentage of the height of the third portion 114 to the margin of the tab 210. If it is less than 15%, the insulating protective film 100 does not adequately cover the electrode assembly 200. The so-called "outer side" of the tab 210 refers to the side of the tab 210 that faces away from the other tab 210 in the longitudinal direction 300. Due to insufficient coverage, the pole piece of the electrode assembly 200 on this side will be excessively exposed, resulting in insufficient insulation protection of the pole piece and possible subsequent pressure damage to the pole piece. If it is greater than 95%, the coverage is excessive and may cause interference with the tab 210.
[0053] Furthermore, as an example, in the embodiments, the insulating protective film 100 can be, for example, a Mylar film. After being coated on the electrode assembly 200, the insulating protective film 100 can be affixed to the outside of the electrode assembly 200 using tape. Furthermore, in the embodiments, although the meaning is generally understood, it should be noted that the electrode assembly 200 should be understood to include an assembly formed by a electrode sheet and a separator, with the electrode tab 210 extending outward from the electrode sheet. Therefore, it can be understood that after the insulating protective film 100 is coated on the outside of the electrode assembly 200, the two together essentially form a bare cell.
[0054] According to the insulating protective film 100 provided in the embodiments of the present application, the value range of G / H can preferably be, for example, 55% ≤ G / H ≤ 85%. Within this preferred range, the amount of insulating protective film 100 used is taken into account. That is, when the third portion 114 is provided with an appropriately sized portion, the area of the third portion 114 is not excessively increased, while also avoiding over- or under-coating. As an example, G / H can be any integer value between 55% and 85%, for example.
[0055] In addition, the insulating protective film 100 may also include two second regions 116, and the two second regions 116 are respectively located on both sides of the bottom 110 in the length direction 300. As an example, the two second regions 116 and the fourth part 115 to be described later can both be formed into a roughly isosceles trapezoid (still not an isosceles trapezoid in the strict sense because of the setting of the rounded corners), and the bottom edge of the second region 116 can be connected to the wide side of the bottom 110.
[0056] According to the insulating protection film 100 provided in the embodiment of the present application, the dimension of the fourth portion 115 in the width direction 400 is E, that is, the height dimension of the fourth portion 115 as a substantially isosceles trapezoid is E. In the embodiment, E satisfies 0.5ND1+2.5mm≤E≤ND1.
[0057] In an embodiment, Figure 4 As shown, Figure 4 Schematic diagram showing a three-dimensional view of a single wound pole group. Figure 1 In an embodiment, the value of D1 can be, for example, 10 mm to 100 mm. According to the insulating protective film 100 provided in an embodiment of the present application, the size of the second portion 113 in the length direction 300 is B, 0.5ND1+2.5mm≤B≤ND1 mm, where N is the number of pole groups.
[0058] Thus, according to the insulating protective film 100 provided in the embodiment of the present application, after the insulating protective film 100 covers the electrode assembly 200, the second portion 113 is located on the two sides of the electrode assembly 200 in the length direction 300. Since the width of the two second portions 113 opposing each other in the width direction 400 exceeds half the width of the entire electrode assembly, these two corresponding second portions 113 can be folded to form an overlapping protective region, thereby further improving the insulation performance of the electrode assembly 200. Here, the lower limit value of B is 2.5 mm, which is greater than half the number of wound electrode groups and is the minimum value for forming an effective overlapping protective region. The upper limit of B can obviously be the same as the width of the entire wound electrode group.
[0059] In addition, the two third portions included in each first region have different sizes in the width direction, and the two second portions included in each first region have different sizes in the length direction, thereby providing more flexibility in the application of the insulating protective film.
[0060] According to a second aspect of an embodiment of the present application, a bare cell is provided. The bare cell includes the above insulating protective film 100 and the above electrode group 200. The electrode group 200 is covered by the insulating protective film 100 to form a bare cell.
[0061] According to a third aspect of an embodiment of the present application, a bare cell is provided. The battery includes the bare cell as described above and may further include a shell. The bare cell may be loaded into the shell to form a battery.
[0062] According to a fourth aspect of an embodiment of the present application, a battery pack is provided. The battery pack includes a plurality of batteries as described above and may further include a box. The plurality of batteries as described above are arranged in the box to form a battery module.
[0063] The above are only preferred embodiments of the present application and do not limit the scope of protection of the present application. All equivalent structural transformations made based on the contents of the present application specification and drawings under the innovative concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.
Claims
1. An insulating protective film, characterized in that: The insulating protective film is used to cover the electrode group, the electrode group has a pole ear located at the top, and the electrode group also has a length direction and a width direction. The insulating protective film includes: A bottom portion, the bottom portion being used to cover the bottom portion of the electrode group; two first areas, the two first areas being respectively located on both sides of the bottom in the width direction; The first region includes a first portion and two second portions, the first portion being connected to a side portion of the bottom portion in the width direction, the two second portions being connected to two sides of the first portion in the length direction, and the first region further includes a third portion corresponding to each second portion, the third portion being connected to a side of the corresponding second portion away from the bottom portion in the width direction; The first portion is used to cover the side of the electrode group in the width direction, the second portion is used to cover the side of the electrode group in the length direction, and the third portion is used to cover the top of the electrode group; The first region further includes a fourth portion, the fourth portion being connected to a side of the first portion in the width direction away from the bottom portion, the side of the fourth portion connected to the first portion being smaller in the length direction than the side of the first portion connected to the fourth portion, such that the fourth portion is spaced apart from both third portions. The dimension of the third portion in the width direction is G, the margin of the electrode tab of the electrode group is H, and 15%≤G / H≤95%.
2. The insulating protective film according to claim 1, wherein 55%≤G / H≤85%, the insulating protection film further includes two second regions, and the two second regions are respectively located on both sides of the bottom in the length direction.
3. The insulating protective film according to claim 1, wherein The dimension of the fourth portion in the width direction is E, the thickness of a single pole group is D1, 0.5ND1+2.5mm≤E≤ND1 mm, where N is the number of pole groups.
4. The insulating protective film according to claim 1, wherein The two third portions included in each of the first regions have different sizes in the width direction.
5. The insulating protective film according to any one of claims 1 to 4, characterized in that The dimension of the second portion in the length direction is B, the thickness of a single pole group is D1, 0.5ND1+2.5mm≤B≤ND1 mm, where N is the number of pole groups.
6. The insulating protective film according to claim 5, characterized in that The two second portions included in each first region have different sizes in the length direction.
7. The insulating protective film according to any one of claims 1 to 4, characterized in that The insulating protection film is bonded to the outer side of the electrode group.
8. A bare battery cell, characterized in that: The bare battery cell includes the insulating protective film according to any one of claims 1 to 7.
9. A battery, characterized in that: The battery comprises the bare cell as claimed in claim 8.
10. A battery pack, characterized in that: The battery pack includes a plurality of batteries as claimed in claim 9.