Electrode insulation structure and battery
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-30
Smart Images
Figure CN224437888U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery cell structure technology, and in particular to an electrode group insulation structure. This utility model also relates to a battery using this electrode group insulation structure. Background Technology
[0002] In existing battery structures, the cover plate is welded to the casing as a single unit. The main purpose is to provide space for the battery electrode assembly, while connecting pieces and other means are used to achieve electrical connection between the battery electrode assembly and the top cover. An insulating film is used to achieve insulation performance inside the battery.
[0003] The insulating film, as a key component, primarily functions to encapsulate the battery electrode assembly, achieving internal insulation. However, in existing technologies, the insulating film in current structures is typically thin, generally around 0.1mm, and made of PP plastic. It only provides insulation protection for the battery electrode assembly and cannot absorb the expansion forces generated during normal battery use. This results in poor battery durability and also restricts the full realization of its performance. Utility Model Content
[0004] In view of this, the present invention aims to propose an electrode group insulation structure that can better absorb the expansion force generated during normal battery use, thereby improving battery durability.
[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0006] An electrode group insulation structure includes a structural body, the structural body including an insulating film and a buffer layer disposed on one side of the insulating film, the buffer layer conforming to the insulating film, and having a recessed portion on at least one side of the buffer layer facing the insulating film;
[0007] The structure body has a first part and a second part arranged opposite to each other, the area of the first part is larger than that of the second part, and the first part is used to cover one opposite side surface of the pole group, and the second part is used to cover the other opposite side surface of the pole group.
[0008] The recessed portion includes a plurality of first pits disposed on the buffer layer corresponding to the first portion, and a plurality of second pits disposed on the buffer layer corresponding to the second portion, wherein the distribution density of the first pits is greater than the distribution density of the second pits.
[0009] Furthermore, the structural body also has a middle portion for covering the bottom surface of the pole group; the recessed portion includes a plurality of third pits disposed on the buffer layer corresponding to the middle portion, and the distribution density of the third pits is greater than the distribution density of the second pits.
[0010] Furthermore, the middle portion is located between the two first portions, and the second portion is provided on each of the two opposite sides of each first portion; the structural body also has a third portion located on the two opposite sides of the middle portion, and the second portions on both sides and the third portions on the corresponding sides are stacked and covered on the pole group.
[0011] Furthermore, creases are provided between the first part and the second part, and between the second part and the middle part; the relationship between the depth l of the crease and the thickness L of the structural cup body satisfies: l = (1 / 3 - 1 / 2)L.
[0012] Furthermore, the middle portion is provided with a channel through which the electrolyte passes, and the channel extends through the main body of the structure.
[0013] Furthermore, the channel is formed by a slit formed on the structural body.
[0014] Furthermore, the thickness of the insulating film is between 0.08 mm and 0.25 mm; and / or, the thickness H of the buffer layer is between 0.15 mm and 1 mm.
[0015] Furthermore, the relationship between H of the buffer layer and the recess depth h of the recessed portion satisfies: h / H = 1 / 8 - 1 / 4.
[0016] Furthermore, the insulating film is made of plastic; and / or the buffer layer is made of foam.
[0017] Compared with the prior art, this utility model has the following advantages:
[0018] (1) The electrode group insulation structure of this utility model includes an insulating film and a buffer layer disposed on one side of the insulating film and conforming to the insulating film, and a recessed portion is provided on at least one side of the buffer layer facing the insulating film. Furthermore, the structure body has a first part and a second part arranged opposite to each other, the area of the first part being larger than that of the second part. The first part is used to cover one opposite side surface of the electrode group, and the second part is used to cover the other opposite side surface of the electrode group. The recessed portion includes a plurality of first pits disposed on the buffer layer corresponding to the first part, and a plurality of second pits disposed on the buffer layer corresponding to the second part. The distribution density of the first pits is greater than that of the second pits. This arrangement can absorb the expansion force generated during normal battery use. Moreover, because the distribution density of the first pits is larger, it can better meet the absorption requirements of the expansion force of the larger surface area of the electrode group, thereby reducing the overall expansion of the battery, improving battery durability, and facilitating the full utilization of battery performance.
[0019] (2) The structure body also has a middle part for covering the bottom surface of the electrode group, and the buffer layer of the middle part is provided with multiple third pits with a distribution density greater than that of the second pit. This arrangement can provide better support for the electrode group and better buffer energy absorption effect, thereby eliminating the traditional bottom support plate at the bottom of the electrode group, which is conducive to simplifying the production process and improving production efficiency.
[0020] (3) The middle part of the structure body is located between the two first parts, and the two opposite sides of each first part are respectively provided with second parts. The structure body also has a third part located on the two opposite sides of the middle part. The second parts on both sides and the third parts on the corresponding sides are stacked and covered on the pole group. This arrangement allows the structure body to fit the shape of the pole group more closely, reduces the gaps and voids between the structure body and the pole group, and helps to improve the integrity of the structure body wrapping, thereby having a better insulation effect and an absorption effect on expansion force.
[0021] (4) Creases are provided between the first part and the second part, and between the second part and the middle part. The relationship between the depth l of the crease and the thickness L of the structural cup body satisfies l = (1 / 3 - 1 / 2)L. This setting makes the structural body more foldable and allows it to be easily covered on different surfaces of the pole group. The crease depth l is between 1 / 3 and 1 / 2 of the thickness L of the structural body. This ensures that the crease is easy to fold while avoiding weakening the overall strength of the structural body due to excessive crease depth, thereby ensuring its service life and reliability.
[0022] (5) The middle part of the electrode group insulation structure is provided with a channel for the electrolyte to pass through, and the channel runs through the structure body. In this way, the setting of the insulation structure can prevent the electrolyte from affecting the flow of electrolyte, so that the electrolyte can enter the electrode group through these channels and fully wet the electrode material, thereby helping to ensure the normal operation of the battery.
[0023] (6) The channel for the electrolyte to pass through the middle part is formed by the gap formed on the structure body. This design can simplify the processing technology, reduce manufacturing difficulty and processing cost while ensuring the strength of the insulating film. It can also prevent impurities from passing through the gap and affecting the battery performance.
[0024] (7) The thickness of the insulating film is between 0.08mm and 0.25mm, and the thickness H of the buffer layer is between 0.15mm and 1mm. In this way, while ensuring good insulation performance and not affecting the heat dissipation of the cell, it can provide effective buffer protection for the cell, effectively avoid the electrode group and the insulating film from being damaged by impact or vibration, improve the reliability and durability of the battery, and help the battery performance to be fully utilized.
[0025] (8) The relationship between H of the buffer layer and the depth h of the recessed part satisfies h / H=1 / 8-1 / 4. This setting can avoid the strength of the buffer layer being weakened due to excessive depth of the recess, thereby helping to ensure the structural strength of the buffer layer and effectively preventing it from cracking after long-term use.
[0026] (9) The insulating film is made of plastic and the buffer layer is made of foam. This design can ensure the insulating performance of the insulating film while giving it good buffering performance, thereby improving the reliability and durability of the battery.
[0027] Another objective of this utility model is to provide a battery, including a battery casing and an electrode assembly disposed within the battery casing, wherein the electrode assembly is covered by the aforementioned electrode assembly insulation structure, and the electrode assembly abuts against the side wall and bottom wall of the battery casing through the structure body.
[0028] The battery described in this invention, by incorporating the aforementioned electrode insulation structure, can absorb the expansion force generated during normal use of the electrode assembly, thereby improving battery durability and facilitating the full utilization of battery performance. Simultaneously, the electrode insulation structure eliminates the need for a battery base plate, simplifying the production process and improving production efficiency. Attached Figure Description
[0029] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0030] Figure 1 This is an overall schematic diagram of the electrode group insulation structure described in an embodiment of the present utility model;
[0031] Figure 2 This is a schematic diagram of the sandwich structure of the electrode group insulation structure described in the embodiment of this utility model;
[0032] Figure 3 This is an exploded view of the overall structure of the battery described in this embodiment of the present invention;
[0033] Explanation of reference numerals in the attached figures:
[0034] 1. Main body of the structure; 11. First part; 12. Second part; 13. Middle part; 14. Third part; 15. Crease; 16. Channel;
[0035] 2. Insulating film; 3. Buffer layer; 31. Recess; 311. First pit; 312. Second pit; 313. Third pit;
[0036] 4. Electrode assembly; 5. Battery casing; 51. Cover; 52. Casing body. Detailed Implementation
[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0038] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0039] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.
[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0041] Example 1
[0042] In existing battery structures, the cover plate and casing are welded together as a single unit. The primary purpose is to provide space for the battery electrode assembly and to achieve electrical connection between the electrode assembly and the top cover via connecting tabs. An insulating film provides insulation for the battery's internal structure. As a key component, the insulating film's main function is to encapsulate the battery electrode assembly and provide internal insulation. However, in existing technologies, the insulating film is typically thin, generally around 0.1mm, and made of PP (Polypropylene) plastic. This film only provides insulation protection for the battery electrode assembly and cannot absorb the expansion forces generated during normal battery use. This results in poor battery durability and limits its full performance potential.
[0043] In view of this, this embodiment specifically proposes an electrode group insulation structure that can effectively absorb the expansion force generated during normal battery use, thereby improving battery durability. In terms of the overall structure, as... Figure 1 and Figure 2As shown, the structure includes a structural body 1, which includes an insulating film 2 and a buffer layer 3 disposed on one side of the insulating film 2. The buffer layer 3 is shaped to conform to the insulating film 2 and has a recess 31 on at least the side of the buffer layer 3 facing the insulating film 2. The structural body 1 has a first portion 11 and a second portion 12 arranged opposite to each other. The area of the first portion 11 is larger than that of the second portion 12, and the first portion 11 is used to cover one opposite side surface of the electrode assembly 4, while the second portion 12 is used to cover the other opposite side surface of the electrode assembly 4. The recess 31 includes a plurality of first pits 311 disposed on the buffer layer 3 corresponding to the first portion 11, and a plurality of second pits 312 disposed on the buffer layer 3 corresponding to the second portion 12, and the distribution density of the first pits 311 is greater than the distribution density of the second pits 312. This design can absorb the expansion force generated during normal battery use. Moreover, because the distribution density of the first pit 311 is relatively large, it can better meet the requirements for absorbing the expansion force of the large surface of the electrode group 4, thereby reducing the overall expansion of the battery, improving battery durability, and facilitating the full utilization of battery performance.
[0044] Furthermore, in specific implementations, a recessed portion 31 can also be provided on the side of the buffer layer 3 facing the casing, thereby further reducing the force transmitted to the internal battery cell. Together with the recessed portion 31 on the side of the buffer layer 3 facing the battery cell, it plays a multi-level buffering role, effectively protecting the battery cell from damage caused by external impacts. Each recessed portion 31 can not only provide… Figure 1 The semi-circle shown can also be a strip or other shapes. The buffer layer 3 and the insulating film 2 can be connected by heat pressing or bonding.
[0045] Additionally, it should be noted that related structures not mentioned in this embodiment, such as pole groups, can be referred to by those skilled in the art, and will not be described in detail here.
[0046] In this embodiment, as a preferred implementation, such as Figure 1 As shown, the structural body 1 also has a middle portion 13 for covering the bottom surface of the electrode assembly 4. The recessed portion 31 includes a plurality of third recesses 313 corresponding to the middle portion 13 and disposed on the buffer layer 3, and the distribution density of the third recesses 313 is greater than the distribution density of the second recesses 312. This arrangement provides better support for the electrode assembly 4 and better buffering and energy absorption, thereby eliminating the need for a traditional bottom support plate at the bottom of the electrode assembly 4, which simplifies the production process and improves production efficiency. In this embodiment, as a preferred implementation, the same... Figure 1As shown, the middle part 13 is located between the two first parts 11, and the two opposite sides of each first part 11 are respectively provided with a second part 12. The structural body 1 also has a third part 14 located on the two opposite sides of the middle part 13. The second parts 12 on both sides and the third parts 14 on the corresponding sides are stacked and covered on the pole group 4.
[0047] The advantage of this arrangement is that it allows the structural body 1 to fit more closely to the shape of the pole group 4, reducing gaps and voids between the structural body 1 and the pole group 4, which helps to improve the integrity of the enclosure of the structural body 1, thereby achieving better insulation and absorption of expansion forces.
[0048] In this embodiment, as a preferred implementation, creases 15 are provided between the first part 11 and the second part 12, and between the second part 12 and the middle part 13. This arrangement allows the structure body 1 to fold more smoothly, making it easier to cover different surfaces of the pole group 4. The relationship between the depth l of the crease 15 and the thickness L of the structure body 1 satisfies: l = (1 / 3 - 1 / 2)L. This ensures that folding at the crease 15 is convenient while avoiding weakening the overall strength of the structure body 1 due to excessively deep creases 15, thereby ensuring its service life and reliability. In a specific implementation, there can be two creases 15 to facilitate bending. The creases 15 are set after the buffer layer 3 and the insulating film 2 are pressed together, and can be set on the surface of the structure body 1 facing the pole group 4 or on the surface of the structure body 1 away from the pole group 4, as long as it makes the folding of the structure body 1 smoother and the relationship between the depth l of the crease 15 and the thickness L of the structure body 1 satisfies: l = (1 / 3 - 1 / 2)L.
[0049] In this embodiment, as a preferred implementation, the following continues... Figure 1 As shown, the middle part 13 is provided with channels 16 for the electrolyte to pass through, and the channels 16 penetrate the main body 1. This arrangement can prevent the insulation structure from affecting the flow of the electrolyte, allowing the electrolyte to enter the electrode assembly 4 through these channels 16, achieving full wetting of the electrode material, thereby ensuring the normal operation of the battery.
[0050] In this embodiment, as a preferred implementation, it is also as follows: Figure 1 As shown, channel 16 is formed by a slit formed on the structural body 1. This arrangement can effectively ensure the strength of the insulating film 2 while simplifying the processing technology, reducing manufacturing difficulty and processing costs, and also preventing impurities from passing through the slit and affecting battery performance.
[0051] In this embodiment, as a preferred implementation, the thickness of the insulating film 2 is between 0.08mm and 0.25mm, and the thickness H of the buffer layer 3 is between 0.15mm and 1mm. The advantage of this arrangement is that it provides effective buffer protection for the battery cell while ensuring good insulation performance and not affecting cell heat dissipation. This effectively prevents the electrode assembly 4 and the insulating film 2 from being damaged by impact or vibration, improving the reliability and durability of the battery and facilitating the full utilization of battery performance.
[0052] In this embodiment, as a preferred implementation, the relationship between the depth H of the buffer layer 3 and the depth h of the recess 31 satisfies: h / H = 1 / 8 - 1 / 4. This setting can prevent the strength of the buffer layer 3 from being weakened due to excessive recess depth, thereby helping to ensure the structural strength of the buffer layer 3 and effectively preventing cracking after long-term use.
[0053] In this embodiment, as a preferred implementation, the insulating film 2 is made of plastic, and the buffer layer 3 is made of foam. This arrangement effectively ensures the insulating performance of the insulating film 2 while giving it good buffering performance, thereby improving the reliability and durability of the battery.
[0054] In specific implementation, the insulating film 2 can be made of plastic materials such as PP (Polypropylene), PC (Polycarbonate), or PET (Polyethylene Terephthalate), while the buffer layer 3 can be made of materials such as MPP foam (Melamine Polypropylene Foam), PU foam (Polyurethane Foam), or silicone foam, which have good compressibility, good impact absorption capacity, and can withstand the corrosion of electrolyte.
[0055] The electrode group insulation structure of this embodiment includes an insulating film 2, a buffer layer 3 disposed on one side of the insulating film 2 and conforming to the insulating film 2, and a structural body 1 with a recessed portion 31 at least on the side of the buffer layer 3 facing the insulating film 2. The structural body 1 has a first portion 11 and a second portion 12 arranged opposite to each other. The area of the first portion 11 is larger than that of the second portion 12, and the first portion 11 is used to cover one opposite side surface of the electrode group 4, while the second portion 12 is used to cover the other opposite side surface of the electrode group 4. The recessed portion 31 includes a plurality of first pits 311 disposed on the buffer layer 3 corresponding to the first portion 11, and a plurality of second pits 312 disposed on the buffer layer 3 corresponding to the second portion 12, with the distribution density of the first pits 311 being greater than the distribution density of the second pits 312. This arrangement can absorb the expansion force generated during normal battery use, thereby reducing the overall expansion of the battery, improving battery durability, and facilitating the full utilization of battery performance.
[0056] Example 2
[0057] This embodiment relates to a battery, such as Figure 3 As shown, it includes a battery housing 5 and an electrode assembly 4 disposed inside the battery housing 5. The electrode assembly 4 is covered with the electrode assembly insulation structure in the embodiment, and the electrode assembly 4 abuts against the side wall and bottom wall of the battery housing 5 through the structural body 1.
[0058] The battery in this embodiment, by incorporating the electrode group insulation structure as described in Embodiment 1, can absorb the expansion force generated during normal battery use, thereby reducing the overall expansion of the battery, improving battery durability, and facilitating the full utilization of battery performance. Simultaneously, the electrode group insulation structure eliminates the need for the traditional bottom support plate located at the bottom of electrode group 4, thus simplifying the production process and improving production efficiency.
[0059] Furthermore, the battery casing 5 in this embodiment includes a cover 51 and a casing body 52. Meanwhile, since no other structural modifications were made to the battery, and... Figure 3 Only the battery casing 5, insulation structure, and electrode assembly 4 are shown in the diagram.
[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A pole group insulation structure, characterized in that: The structure includes a structural body, which includes an insulating film and a buffer layer disposed on one side of the insulating film. The buffer layer conforms to the insulating film and has a recess on at least one side of the buffer layer facing the insulating film. The structure body has a first part and a second part arranged opposite to each other, the area of the first part is larger than that of the second part, and the first part is used to cover one opposite side surface of the pole group, and the second part is used to cover the other opposite side surface of the pole group. The recessed portion includes a plurality of first pits disposed on the buffer layer corresponding to the first portion, and a plurality of second pits disposed on the buffer layer corresponding to the second portion, wherein the distribution density of the first pits is greater than the distribution density of the second pits.
2. The electrode group insulation structure according to claim 1, characterized in that: The structural body also has a middle portion for covering the bottom surface of the pole group; The recessed portion includes a plurality of third pits disposed on the buffer layer corresponding to the middle portion, and the distribution density of the third pits is greater than the distribution density of the second pits.
3. The electrode group insulation structure according to claim 2, characterized in that: The middle portion is located between the two first portions, and the second portion is provided on two opposite sides of each of the first portions; The structure body also has a third part located on two opposite sides of the middle part, and the second part on both sides and the third part on the corresponding side are stacked and covered on the pole group.
4. The electrode group insulation structure according to claim 2, characterized in that: Creases are provided between the first part and the second part, and between the second part and the middle part; The relationship between the depth l of the crease and the thickness L of the structural body satisfies: l＝(1 / 3-1 / 2)L。 5. The electrode group insulation structure according to claim 2, characterized in that: The middle section is provided with a channel for the electrolyte to pass through, and the channel is set through the main body of the structure.
6. The electrode group insulation structure according to claim 5, characterized in that: The channel is formed by a slot formed on the structure body.
7. The electrode group insulation structure according to claim 1, characterized in that: The thickness of the insulating film is between 0.08 mm and 0.25 mm; and / or, The thickness H of the buffer layer is between 0.15mm and 1mm.
8. The electrode group insulation structure according to claim 1, characterized in that: The relationship between the H of the buffer layer and the depth h of the recessed portion satisfies: h / H = 1 / 8 - 1 / 4.
9. The electrode group insulation structure according to any one of claims 1 to 8, characterized in that: The insulating film is made of plastic; and / or, The buffer layer is made of foam.
10. A battery, characterized in that: The battery includes a battery housing and an electrode assembly disposed within the battery housing, and the electrode assembly is covered by an electrode assembly insulation structure as described in any one of claims 1 to 9, wherein the electrode assembly abuts against the side wall and bottom wall of the battery housing through the structure body.