Insulation assembly for battery and battery
By incorporating elastic portions of varying thicknesses and positions within the battery insulation assembly, the problem of uneven stress release during core charging was resolved, resulting in uniform core expansion and improved battery performance and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-24
AI Technical Summary
During the charging process, existing square aluminum-cased batteries are prone to wrinkling due to uneven stress release between the core and the outer casing. This can affect electrolyte distribution and battery performance, and even pose safety risks.
An insulating component is designed, comprising a base film, a first elastic part, a second elastic part, and a third elastic part. By setting elastic parts of different thicknesses and positions, it is ensured that the core is subjected to uniform force during expansion, thus avoiding the formation of wrinkles.
The design of multiple elastic sections provides appropriate expansion space, ensuring uniform stress on the core, avoiding electrolyte breakage, and improving battery performance and safety.
Smart Images
Figure CN224036607U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of batteries, and more specifically, to an insulating component for batteries and a battery. Background Technology
[0002] A square aluminum-cased battery consists of a core, a top cover, an insulating assembly, and an aluminum casing. The insulating assembly is located between the core and the casing to prevent the casing from becoming charged due to contact between the core and the casing. However, cores with different tolerance designs have varying gaps between the core and the casing. During charging, the core expands. When the core expands, the portion closer to the casing is constrained by the limited space between them, resulting in stress. This stress release is uneven, especially on the non-tab side of the core, where it directly contacts the casing. This unevenness is particularly pronounced because as the core expands, its internal pressure pushes it towards the casing, but the rigidity of the casing hinders stress release at different points. Stress release is easier in areas with larger gaps between the core and the casing, while it is more limited in areas with smaller gaps. This uneven stress distribution causes wrinkles to form on the core during expansion, especially at the center of the large surface area of the casing where the core contacts the casing. The formation of wrinkles disrupts the structural integrity of the core, thereby affecting the uniform distribution of the electrolyte and creating a phenomenon known as "electrolyte bridging." Electrolyte bridging refers to the inability of the electrolyte to form a continuous conductive path within the core due to discontinuities in its internal structure (such as wrinkles). This significantly reduces the core's conductivity and energy density, leading to a decline in battery performance, such as increased internal resistance, reduced energy output, and shortened cycle life. Furthermore, electrolyte bridging can also cause problems such as internal battery overheating and pressure buildup, exacerbating core damage and even posing safety risks.
[0003] Therefore, in the existing square aluminum-cased battery structure, the insulating components usually have elastic parts on their surface to absorb stress and improve the wrinkling of the core. However, the ability of the elastic parts, which are evenly distributed on the surface of the insulating components, to absorb stress is also relatively uniform. When the stress on different areas of the core is different, the effect is often not good, and the core is still prone to wrinkling. Utility Model Content
[0004] The main objective of this invention is to provide an insulating component and a battery for use in batteries, in order to solve the problem in the prior art that the core is prone to wrinkling due to uneven stress release on the outer shell side during the core charging and expansion process.
[0005] In order to achieve the above object, according to one aspect of the present application, an insulating assembly for a battery is provided, comprising: a base film, a first elastic part, a second elastic part and a third elastic part, the base film having opposite first and second sides, the first side facing a jelly-roll of the battery, and the second side facing a shell of the battery; the first elastic part is arranged on the first side of the base film; the second elastic part is arranged on the second side of the base film; the third elastic part is arranged on the second side of the base film, and in a direction perpendicular to the first side, the thickness of the third elastic part is greater than the thickness of the second elastic part, the third elastic part is located on the periphery of the second elastic part, and the third elastic part is used for abutting and matching with an edge portion of the shell.
[0006] Further, the third elastic part is a plurality of, and the second elastic part is provided with the third elastic part on opposite sides.
[0007] Further, the projection area of the second elastic part on the second side accounts for 35%-45% of the projection area of the second side on the surface of the jelly-roll, and the projection area of all the third elastic parts on the second side accounts for 40%-50% of the projection area of the second side on the surface of the jelly-roll.
[0008] Further, the second elastic part comprises a plurality of first bosses, and the third elastic part comprises a plurality of second bosses, and in a direction parallel to the first side, the cross-sectional area of the first boss is greater than the cross-sectional area of the second boss.
[0009] Further, the distance between adjacent first bosses is greater than the distance between adjacent second bosses, so that the distribution density of the first bosses is less than the distribution density of the second bosses.
[0010] Further, the first boss and / or the second boss are arranged as at least one of a cylindrical boss and a prismatic boss.
[0011] Further, the projection area of the first elastic part on the first side accounts for 80%-95% of the projection area of the first side on the surface of the jelly-roll.
[0012] Further, the insulating assembly further comprises a non-elastic part, the non-elastic part is arranged on a side of the first elastic part away from the base film, and the non-elastic part is used for contact matching with the surface of the jelly-roll.
[0013] Further, in a direction perpendicular to the first side, the thickness of the first elastic part is greater than the thickness of the non-elastic part, and the thickness of the non-elastic part is greater than the thickness of the base film.
[0014] According to another aspect of the present application, a battery is provided, comprising a shell, a jelly-roll and the above-mentioned insulating assembly for the battery, the jelly-roll and the insulating assembly are both located in the shell, and the insulating assembly is located between the jelly-roll and the shell.
[0015] The utility model discloses a technical scheme, through setting up multiple elastic parts, and the position and thickness of second elastic part and third elastic part are different, thereby making battery in the charging process, can give the proper expansion space to the core, can ensure the core big face stress uniformity simultaneously, thereby reduces the core near the side of shell and produces the wrinkle because of uneven stress, further avoids electrolyte broken bridge phenomenon, thereby promotes the performance of battery. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings are provided to explain various aspects of the present application and are not intended to limit the present application. In the drawings:
[0017] Figure 1 A structure schematic view of the insulation assembly of the utility model is shown;
[0018] Figure 2 A structure schematic view of the insulation assembly from another angle is shown;
[0019] Figure 3 A top view of the insulation assembly is shown;
[0020] Figure 4 A sectional view of the insulation assembly is shown;
[0021] Figure 5 A sectional view of the battery is shown.
[0022] In the above drawings, the following reference signs are used:
[0023] 10. Base film; 20. First elastic part; 30. Second elastic part; 31. First boss; 40. Third elastic part; 41. Second boss; 50. Non-elastic part. Detailed Implementation
[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.
[0027] To address the problem in the prior art where uneven stress release on the outer shell side of the core during charging expansion leads to wrinkles in the core, this invention provides an insulating component and a battery for batteries.
[0028] like Figures 1 to 5 An insulating assembly for a battery is shown, comprising: a base film 10, a first elastic portion 20, a second elastic portion 30, and a third elastic portion 40. The base film 10 has opposing first and second sides, the first side facing the battery core and the second side facing the battery casing. The first elastic portion 20 is disposed on the first side of the base film 10; the second elastic portion 30 is disposed on the second side of the base film 10; and the third elastic portion 40 is disposed on the second side of the base film 10. In a direction perpendicular to the first side, the thickness of the third elastic portion 40 is greater than the thickness of the second elastic portion 30. The third elastic portion 40 is located around the second elastic portion 30 and is used to abut against the edge portion of the casing.
[0029] The battery can give the winding core appropriate expansion space during the charging process, and can ensure that the winding core is uniformly stressed, thereby reducing the wrinkles of the winding core near the side of the shell due to uneven stress, and further avoiding the electrolyte bridge breaking phenomenon, thereby improving the performance of the battery. Specifically, on the one hand, the elastic part is arranged on the opposite first side and second side, so that the base film 10 and the winding core, the base film 10 and the shell have elastic parts, so that the first elastic part 20, the second elastic part 30 and the third elastic part 40 remain in a natural state before the winding core expands, and fill the gap between the winding core and the base film 10 and between the base film 10 and the shell. When the winding core expands, the elastic parts between the winding core and the base film 10 and between the base film 10 and the shell can be deformed under stress, thereby giving the winding core a larger expansion space and avoiding wrinkles due to uneven expansion of the winding core. On the other hand, considering that the binding strength of the center and the edge part of the large surface of the shell is different, the closer to the edge of the large surface and the other side of the shell, the greater the binding strength, and the binding strength of the center of the large surface is the weakest, so the thickness of the second elastic part 30 and the third elastic part 40 is different, and the third elastic part 40 is arranged on the side of the second elastic part 30. In this way, the third elastic part 40 abuts against the edge part of the shell, and when the winding core expands, it first impacts the edge part of the shell, thereby compensating for the weakness that the binding force of the center of the shell is less than that of the edge part, so that the large surface of the shell can be uniformly restrained, thereby improving the problem of the center of the large surface of the shell bulging due to the expansion of the winding core and the different binding forces of the large surface of the shell, so that the winding core can expand uniformly, thereby avoiding the problem of wrinkles of the winding core.
[0030] It should be noted that the battery is a cuboid structure, and the base film 10 is arranged between the large surface of the shell and the winding core. Figure 1 , Figure 2As shown, the insulation assembly of the embodiment further comprises a bottom support sheet, the insulation assembly as a whole is in U shape, the bottom support sheet is located at the bottom of the battery, and the base film 10 is arranged on the opposite sides of the bottom support sheet, and the bottom support sheet connects the base films 10 on the two sides into a whole. In order to match the shape of the battery, the base film 10 of the embodiment is arranged in a rectangular shape, one side of which is adjacent to the bottom support sheet, and the remaining three edges are all folded to the other sides of the battery. The middle part of the base film 10 matches the large surface of the battery, that is, the position where the first elastic part 20, the second elastic part 30 and the third elastic part 40 are arranged. The large surface of the shell refers to the larger surface among the circumferential surfaces of the shell of the battery, and the rectangular battery has two opposite large surfaces. The small surface of the shell refers to the smaller surface among the circumferential surfaces. In the embodiment of the application, the edge part of the shell can be defined by each surface of the shell, for example, the edge part of the large surface of the shell refers to the part close to the four sides of the large surface of the shell, which is distinguished from the middle part of the large surface of the shell. The first elastic part 20, the second elastic part 30 and the third elastic part 40 of the embodiment are all arranged between the large surface of the shell and the roll core. Of course, according to the actual situation, for example, when the volume of the battery is large, the first elastic part 20, the second elastic part 30 and the third elastic part 40 can also be arranged between each surface of the shell and the roll core, or when the battery is arranged in a cylindrical structure, the first elastic part 20, the second elastic part 30 and the third elastic part 40 can also be arranged between the entire circumferential surface of the shell and the roll core, so as to reduce the wrinkles of the roll core.
[0031] In the embodiment, the third elastic part 40 is multiple, and the second elastic part 30 is provided with the third elastic part 40 on the opposite sides, so as to enhance the support and contact of the edge of the shell, so as to further uniformly disperse the pressure when the roll core expands, and avoid local stress concentration. Taking the second elastic part 30 as an example, the second elastic part 30 has two groups of opposite sides, wherein the side close to the top cover of the battery and the side close to the bottom of the battery are opposite sides, and the two sides close to the small surface of the battery are also opposite sides. The third elastic part 40 can be arranged on the opposite sides of any one group of the second elastic part 30, or can also be arranged on the opposite sides of the two groups of the second elastic part 30 at the same time, so that the third elastic part 40 is arranged around the second elastic part 30. In this way, the second elastic part 30 is arranged in the middle part of the third elastic part 40, so that each edge of the large surface has the third elastic part 40, so that when the roll core expands, the stress of each edge of the large surface of the shell is greater than that of the center of the large surface, so as to improve the wrinkle problem of the roll core.
[0032] For example, Figure 3As shown, the second elastic part 30 is arranged on the two sides of the small face of the battery, and the third elastic part 40 is arranged on the edge of the large face of the battery and adjacent to the small face of the battery. When the base film 10 is connected to the top cover of the battery away from the top of the bottom support, and the base film 10 is connected to the bottom of the battery close to the bottom of the bottom support, the first elastic part 20, the second elastic part 30, and the third elastic part 40 are arranged on the large face between the top cover and the bottom of the battery, and the second elastic part 30 is arranged between the third elastic part 40, that is, the second elastic part 30 is arranged in the middle of the large face, so that the edge of the large face with strong restraint force is subjected to greater pressure from the third elastic part 40 than the elastic force from the second elastic part 30 to the middle of the large face, thereby enabling the large face of the shell to uniformly constrain the roll core, thereby avoiding the problem of the center of the large face of the shell bulging due to the expansion of the roll core, thereby improving the roll core wrinkle problem, and further improving the structural stability of the battery in different charging states, thereby enhancing the safety and consistency of the battery. Of course, the positions of the second elastic part 30 and the third elastic part 40 can also be adjusted according to actual conditions, for example, the second elastic part 30 can be arranged at the center of the large face, and the third elastic part 40 can be arranged only on one side of the second elastic part 30.
[0033] Preferably, the projection area of the second elastic part 30 on the second side accounts for 35%-45% of the projection area of the second side on the surface of the roll core, and the projection area of all the third elastic parts 40 on the second side accounts for 40%-50% of the projection area of the second side on the surface of the roll core. In this way, by accurately controlling the area ratio of the second elastic part 30 and the third elastic part 40, the force transmission and dispersion during the expansion of the roll core are optimized, thereby ensuring that the expansion force of the roll core can act uniformly on the entire insulating assembly during the expansion of the roll core, thereby avoiding excessive local stress that can damage the battery. Specifically, the second elastic part 30 of the present embodiment is provided with two third elastic parts 40 on the circumferential side, and the sum of the projection areas of the two third elastic parts 40 on the large face of the battery accounts for 40%-50% of the projection area of the second side on the large face of the battery, thereby ensuring the stability of the roll core during the expansion process and avoiding wrinkles caused by hard contact. The second elastic part 30 ensures that the middle of the large face of the shell is subjected to less force than the edge of the large face, thereby avoiding the bulging of the middle of the large face, and the sum of the projection areas of the second elastic part 30 and the two third elastic parts 40 on the large face of the battery is greater than or equal to 75% of the projection area of the second side on the large face of the battery, thereby ensuring the proportion of the elastic part on the second side, thereby ensuring the effectiveness of the elastic part, and further improving the structural stability and safety of the battery during the charging process, thereby prolonging the service life of the battery.
[0034] In the embodiment, the second elastic part 30 includes a plurality of first bosses 31, and the third elastic part 40 includes a plurality of second bosses 41. In the direction parallel to the first side surface, the cross-sectional area of the first boss 31 is greater than that of the second boss 41, so as to realize the graded response to the expansion force of the winding core, the first boss 31 provides weaker elastic support in the early stage of the expansion of the winding core, and the second boss 41 provides stronger elastic support in the later stage of the expansion of the winding core, so as to ensure the uniform stress of the winding core in the whole charging process, while avoiding the local bulging of the large surface of the shell, thereby improving the structural stability and electrical performance of the battery in different charging states. As shown in Figure 3 、 Figure 4 the first boss 31 and the second boss 41 are both columnar structures protruding from the second side surface, such as a cylinder, a prism, etc., and both extend perpendicularly to the second side surface in the direction away from the second side surface by a certain distance. The second boss 41 extends by a greater distance than the first boss 31, so the second boss 41 is arranged in an elongated structure compared with the first boss 31.
[0035] In the embodiment, the distance between adjacent first bosses 31 is greater than the distance between adjacent second bosses 41, so that the distribution density of the first boss 31 is less than that of the second boss 41, thereby further optimizing the force transmission path during the expansion of the winding core, so as to ensure that the expansion force of the winding core can be uniformly transmitted, and local stress concentration is avoided. Specifically, as shown in Figure 3 the area of the second boss 41 of the embodiment is small and arranged in a concentrated manner, while the area of the first boss 31 is large and arranged in a dispersed manner. The lower density means that each first boss 31 can cover a larger surface area of the winding core, thereby providing lower elastic resistance in the area, so as to ensure that when the winding core is simultaneously pressed during the expansion process, the second elastic part 30 and the third elastic part 40 are avoided to form excessive stress concentration in the central area. Preferably, the maximum deformability of the first elastic part 20 is 50%, and the shape is a cuboid solid. When the maximum deformability is exceeded, the first elastic part 20 changes to a non-elastic state. The maximum deformability of the second elastic part 30 is 50%, and it changes to a non-elastic state when the maximum deformability is exceeded. The maximum deformability of the third elastic part 40 is 60%, and it changes to a non-elastic state when the maximum deformability is exceeded. The elastic modulus of the first elastic part 20, the second elastic part 30 and the third elastic part 40 is the same.
[0036] In the embodiment, the first boss 31 and / or the second boss 41 are arranged as at least one of a cylindrical boss and a prismatic boss, so as to realize the efficient dispersion of the expansion force of the winding core and stress release, while being able to ensure the close contact between the insulating assembly and the winding core and the shell. Specifically, as shown in Figure 3As shown, the first protrusion 31 of the embodiment is provided in a square shape, the bottom surface of the first protrusion 31 coincides with the second side surface, and the top surface abuts against the shell as the core expands. The second protrusion 41 is provided in a cylindrical shape, one of the two bottom surfaces of the cylinder coincides with the second side surface, and the other abuts against the shell. Of course, according to actual needs, the first protrusion 31 and the second protrusion 41 can also be provided in a cylindrical shape or a prismatic shape, etc., as long as the use requirements can be met.
[0037] In the embodiment, the first elastic part 20 accounts for 80%-95% of the projection area of the first side surface on the surface of the core, thereby ensuring the proportion of the first elastic part 20, so as to effectively provide sufficient deformation space and internal restraint force, make the stress of the core uniform, reduce or eliminate the wrinkle problem caused by uneven stress release of the core, and further improve the overall performance and consistency of the core.
[0038] In the embodiment, the insulating assembly further comprises a non-elastic part 50, which is arranged on the side of the first elastic part 20 away from the base film 10. The non-elastic part 50 is used to contact and cooperate with the surface of the core, thereby achieving preliminary restraint of the core expansion, avoiding disordered expansion of the core in the initial charging stage, and ensuring close contact between the core and the insulating assembly. Specifically, the first elastic part 20 is arranged between the base film 10 and the non-elastic part 50. The non-elastic part 50 has no deformation and can abut against the core in a plane, so as to make the local restraint force of the core uniform and the restraint effect good. The surface size of the non-elastic part 50 is not less than the surface size of the first elastic part 20, so that the non-elastic part 50 can cover the first elastic part 20 as a whole, or the non-elastic part 50 and the first elastic part 20 can be arranged in a stacked manner, so that the core can be in contact with the non-elastic part 50 as a whole when it expands, thereby achieving hard contact between the core and the insulating assembly, so that the core can expand uniformly as a whole, and the local wrinkles in the core expansion process caused by uneven local stress of the first elastic part 20 are avoided. In this way, the core expansion force passes through the non-elastic part 50, the first elastic part 20 and the third elastic part 40 with a larger thickness in sequence, first impacts the shell edge, makes up for the weakness that the center restraint force of the shell is smaller than the edge, makes the large surface of the shell uniformly restrained, and can improve the problem of center bulging of the large surface of the shell caused by different large surface restraint forces of the core expansion.
[0039] In the embodiment, the thickness of the first elastic part 20 is greater than the thickness of the non-elastic part 50, and the thickness of the non-elastic part 50 is greater than the thickness of the base film 10 in the direction perpendicular to the first side face. In this way, the first elastic part 20 has a higher thickness, which can provide sufficient deformation space and elastic recovery capability to adapt to the expansion of the core during charging; the non-elastic part 50, although the thickness is smaller than that of the first elastic part 20, is still greater than that of the base film 10, which can prevent the core from directly contacting the shell and can play a buffering role; the base film 10, as the basic layer of the entire insulation assembly, has the smallest thickness, and mainly plays a role in supporting and connecting other parts.
[0040] The embodiment also provides a battery, which comprises a shell, a core and the above-mentioned insulation assembly for the battery, the core and the insulation assembly are located in the shell, and the insulation assembly is located between the core and the shell. In this way, the insulation assembly with specific elastic properties between the core and the shell is ensured, so as to realize uniform control of the expansion of the core and stress release, and at the same time, the close contact between the core and the shell can be ensured, thereby effectively improving the problem of wrinkles of the core. Optionally, the insulation assembly can adopt a Mylar film.
[0041] The deformation process of the insulation assembly of the embodiment in use is as follows: in the assembly process, the edge of the base film 10 away from the bottom support plate is laser welded with the plastic under the top cover of the battery, so that the insulation assembly completely wraps the core. Between the base film 10 and the core, the first elastic part 20 and the non-elastic part 50 are included in turn, and the non-elastic part 50 abuts against the core; when the core is charged and expanded, the expansion force is transmitted to the first elastic part 20, the base film 10, the second elastic part 30, the third elastic part 40 and the shell through the non-elastic part 50; as the number of charging and discharging of the core increases, the first elastic part 20 deforms first, followed by the third elastic part 40, and finally the second elastic part 30 deforms, and the core gradually steps from the first state to the second state and then to the third state. When the core has a certain expansion, but the deformation rate of the first elastic part 20 is less than 50%, the third elastic part 40 abuts against the shell and the elastic deformation rate is less than 10%, at this time, the core is in the first state; when the core continues to expand, the deformation rate of the first elastic part 20 is less than 50%, the third elastic part 40 abuts against the shell and the elastic deformation rate is greater than 10% but less than 50%, the second elastic part 30 abuts against the shell, and the deformation rate of the second elastic part 30 is less than 50%, at this time, the core is in the second state; when the first elastic part 20, the second elastic part 30 and the third elastic part 40 break through the maximum deformation rate and become non-elastic, at this time, the insulation assembly does not have elasticity, completely abuts against the core, and the core is in the third state. In this way, through the cooperation of each part of the insulation assembly, the expansion space of the core is given, and at the same time, the stress of the large surface of the core is uniform, and the wrinkles on the side of the core close to the shell caused by stress difference are eliminated; the transformation of the elastic deformation state and the non-deformation state of each elastic part gradually forms internal restraint, improves the wrinkles of the core, and improves the consistency of the core.
[0042] It should be noted that the plurality in the above embodiments means at least two.
[0043] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:
[0044] 1. By setting multiple elastic parts, the problem that the winding core is prone to wrinkles in the prior art is solved.
[0045] 2. By setting multiple elastic parts, and the positions and thicknesses of the second elastic part and the third elastic part are different, so that the battery can give the winding core appropriate swelling space during the charging process, and at the same time, it can ensure that the winding core is uniformly stressed on the large surface, thereby reducing wrinkles on the side of the winding core close to the shell due to uneven stress, and further avoiding the electrolyte bridge breaking phenomenon, thereby improving the performance of the battery.
[0046] 3. The elastic parts are arranged on the opposite first side and second side, so that the elastic parts are arranged between the base film and the winding core and between the base film and the shell. In this way, before the winding core swells, the first elastic part, the second elastic part and the third elastic part maintain a natural state, filling the gap between the winding core and the base film and between the base film and the shell. When the winding core swells, the elastic parts between the winding core and the base film and between the base film and the shell can be deformed under stress, thereby giving the winding core a larger swelling space and avoiding wrinkles due to uneven swelling of the winding core.
[0047] 4. The thicknesses of the second elastic part and the third elastic part are different, and the third elastic part is arranged on the circumferential side of the second elastic part. In this way, the third elastic part abuts against the edge portion of the shell, and when the winding core swells, it first impacts the edge portion of the shell, thereby compensating for the weakness that the central binding force of the shell is smaller than the edge portion, so that the large surface of the shell can be uniformly restrained, thereby improving the problem of central bulging of the large surface of the shell caused by different binding forces of the large surface of the shell due to swelling of the winding core, so that the winding core can swell uniformly, and further avoiding the problem of wrinkles of the winding core.
[0048] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the utility model.
[0049] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.
[0050] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above-described drawings are used only to distinguish similar objects and do not necessarily have to describe a particular chronological or sequential order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An insulating component for a battery, characterized in that, include: The base film (10) has a first side and a second side opposite to each other, the first side facing the core of the battery and the second side facing the outer casing of the battery; A first elastic portion (20) is disposed on a first side surface of the base film (10); The second elastic portion (30) is disposed on the second side surface of the base film (10); The third elastic part (40) is disposed on the second side of the base film (10) in a direction perpendicular to the first side. The thickness of the third elastic part (40) is greater than the thickness of the second elastic part (30). The third elastic part (40) is located on the periphery of the second elastic part (30). The third elastic part (40) is used to abut against the edge portion of the outer shell.
2. The insulating assembly for a battery according to claim 1, characterized in that, There are multiple third elastic portions (40), and the third elastic portions (40) are provided on both sides opposite to the second elastic portions (30).
3. The insulating component for a battery according to claim 2, characterized in that, The projected area of the second elastic part (30) on the second side accounts for 35%-45% of the projected area of the second side on the surface of the core, and the projected area of all the third elastic parts (40) on the second side accounts for 40%-50% of the projected area of the second side on the surface of the core.
4. The insulating assembly for a battery according to claim 1, characterized in that, The second elastic part (30) includes a plurality of first protrusions (31), and the third elastic part (40) includes a plurality of second protrusions (41). Along the direction parallel to the first side, the cross-sectional area of the first protrusion (31) is larger than the cross-sectional area of the second protrusion (41).
5. The insulating assembly for a battery according to claim 4, characterized in that, The distance between adjacent first protrusions (31) is greater than the distance between adjacent second protrusions (41) so that the distribution density of the first protrusions (31) is less than the distribution density of the second protrusions (41).
6. The insulating assembly for a battery according to claim 5, characterized in that, The first boss (31) and / or the second boss (41) are configured as at least one of a cylindrical boss and a prismatic boss.
7. The insulating component for a battery according to any one of claims 1 to 6, characterized in that, The projected area of the first elastic part (20) on the first side accounts for 80%-95% of the projected area of the first side on the surface of the core.
8. The insulating component for a battery according to any one of claims 1 to 6, characterized in that, The insulating component further includes a non-elastic portion (50) disposed on the side of the first elastic portion (20) away from the base film (10), and the non-elastic portion (50) is used to contact and engage with the surface of the core.
9. The insulating assembly for a battery according to claim 8, characterized in that, Along the direction perpendicular to the first side, the thickness of the first elastic portion (20) is greater than the thickness of the non-elastic portion (50), and the thickness of the non-elastic portion (50) is greater than the thickness of the base film (10).
10. A battery, characterized in that, The battery includes a housing, a winding core, and an insulating assembly for a battery as described in any one of claims 1 to 9, wherein the winding core and the insulating assembly are both located within the housing, and the insulating assembly is located between the winding core and the housing.