Flexible package battery air bag
By introducing a stretchable extension and a hollow chamber structure into the lithium-ion battery soft-package battery air bag, the problem of air bag bursting caused by the large gas production of silicon negative electrode materials is solved, and greater gas containment and transportation convenience are achieved.
Patent Information
- Application Number
- CN202422541287.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-21
AI Technical Summary
Silicon negative electrode materials produce a large amount of gas during the first charge and discharge process of lithium-ion batteries, resulting in the battery cell air bag being insufficient to contain the gas, and there is a risk of the air bag bursting during formation.
A soft-package battery air bag is designed, comprising a first bag body and a second bag body. The second bag body has an expandable extension and a hollow structure chamber, which are connected by a gas channel and are used to store formed gas. The extension expands under gas pressure to increase the gas space.
The gas storage space is increased, which reduces the risk of the air bag bursting during the first charge and discharge of the battery cell, and ensures the convenience of transportation and storage.
Smart Images
Figure CN223401647U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of lithium-ion batteries, and more specifically, relates to a soft-package battery air bag. Background Art
[0002] Lithium-ion batteries are widely used in power, consumer, and energy storage applications due to their high energy density, high charging efficiency, superior cycle performance, and high output power. With the continuous advancement of technology, the application areas of lithium-ion batteries are constantly expanding, and higher requirements are being placed on the structure and performance of lithium-ion batteries. To better meet customer needs, the application frequency of silicon-carbon materials is increasing.
[0003] Currently, silicon has the highest known specific capacity of any anode material, reaching 4200 mAh / g. Compared to graphite anode materials, silicon also has a higher lithium intercalation and deintercalation potential, effectively preventing lithium precipitation during high-rate charge and discharge, thereby improving battery safety. However, silicon anode materials generate much more gas than graphite during the initial charge and discharge process. This can lead to the original battery cell gas pocket being insufficient to contain the generated gas, posing a risk of bursting the pocket during formation. Utility Model Content
[0004] The purpose of this application is to provide a soft-package battery air bag to solve the technical problem in the prior art that the silicon negative electrode material produces a large amount of gas during the first charge and discharge process, which may cause the original battery cell air bag to be insufficient to contain the produced gas and there is a risk of bursting the air bag during formation.
[0005] To achieve the above objectives, the technical solution adopted in this application is:
[0006] Provided is a soft-package battery air bag, comprising:
[0007] a first bag body, the first bag body being used to accommodate the battery cell; and
[0008] The second bag body includes a main body and an expandable extension part. The hollow structure of the main body and the gap structure of the extension part together constitute a chamber for storing the formed gas; the main body is connected to the first bag body, and a gas channel is formed at the connection between the main body and the first bag body. The chamber and the first bag body are connected to each other through the gas channel.
[0009] Optionally, the extension portion is provided on at least one of the two sides of the main body thickness.
[0010] Optionally, in the expanded state of the second bag body, the inner wall of the chamber corresponding to the side of the second bag body provided with the extension portion is stepped, so that the chamber gradually expands from the side close to the first bag body to the direction away from the first bag body.
[0011] Optionally, the extension portion is connected to the surface of the main body and is in a frill and / or bulge shape.
[0012] Optionally, the width of the main body is L, there is an overlapping portion between the main body and the extended portion, the sum of the widths of the overlapping portions is X, and 0<X<L.
[0013] Optionally, the number of the extensions is n, where n is a positive integer, the width of the overlapping portion of each extension and the main body is x, and the widths of the extensions are l1, l2, l3...l n , where l1, l2, l3...l n <L,l1+l2+l3…l n +(n-1)x=L.
[0014] Optionally, a sealed edge is provided at the connection between the main body and the first bag body, the width of the sealed edge is b, the number of extensions is n, n is a positive integer, and the width of the overlapping part of each extension with the main body is x, wherein b<x.
[0015] Optionally, assuming that the hollow structure of the main body can accommodate a gas volume of V0, the width of the main body is L, the second bag body can accommodate a gas volume of V1, 0.9(n(xb)+L)V0 / L≤V1≤1.1(n(xb)+L)V0 / L.
[0016] Optionally, the length of the gas channel is a, and the width of the main body is K, wherein a<K.
[0017] Optionally, the main body and the extension portion are an integrated structure.
[0018] The beneficial effects of the soft-package battery air bag provided in this application are:
[0019] During formation, the battery cell is placed in the first bag body, and the gas generated by the formation of the battery cell flows into the cavity of the second bag body through the gas channel and is stored. The gas first inflates the main body, and then the pressure of the gas pushes the extension part to expand, and a gap structure is formed in the middle of the extension part. The gas enters the gap structure of the extension part, thereby increasing the space for holding gas. Compared with the prior art, the second bag body of the soft-package battery air bag of the present application is provided with an expandable extension part, which increases the space for holding gas. When not in use, the extension part will maintain its original unexpanded state, occupying very little space or almost no space. While ensuring that storage and transportation difficulties are not increased, the gas storage performance of the second bag body is improved, and the risk of the air bag bursting due to the large amount of gas produced during the first charge and discharge of the battery cell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0021] Figure 1 Schematic diagram of the structure of the soft-package battery air bag provided in the embodiment of this application Figure 1 ;
[0022] Figure 2 for Figure 1 A schematic structural diagram of a soft-package battery air bag from another angle;
[0023] Figure 3 This is a schematic structural diagram of the stepped inner wall of the chamber of the soft-package battery air bag provided in an embodiment of the present application during expansion of the second bag body.
[0024] Description of reference numerals:
[0025] 1. Soft-package battery air bag; 10. First bag body; 20. Second bag body; 21. Main body; 22. Extension; 23. Chamber; 24. Gas channel; 25. Edge sealing. DETAILED DESCRIPTION
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0027] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0030] Please also refer to Figures 1 to 3 The soft-package battery air bag 1 provided in an embodiment of the present application is now described. The soft-package battery air bag 1 includes a first bag body 10 and a second bag body 20. The first bag body 10 is used to accommodate battery cells. The second bag body 20 includes a main body 21 and an extendable extension 22. The hollow structure of the main body 21 and the void structure of the extension 22 together form a chamber 23 for storing the formed gas. The main body 21 is connected to the first bag body 10. A gas channel 24 is formed at the connection between the main body 21 and the first bag body 10. The chamber 23 and the first bag body 10 are connected to each other through the gas channel 24.
[0031] The soft-package battery air bag 1 of the present application, when formed, the battery cell is placed in the first bag body 10, and the gas generated by the formation of the battery cell flows into the chamber 23 of the second bag body 20 through the gas channel 24 and is stored in the chamber 23 of the second bag body 20. The gas first inflates the main body 21, and then the pressure of the gas pushes the extension part 22 to stretch, forming a gap structure in the middle of the extension part 22. The gas enters the gap structure of the extension part 22, thereby achieving the effect of increasing the space for containing gas.
[0032] Compared with the prior art, the second bag body 20 of the soft-package battery air bag 1 of the present application is provided with an expandable extension portion 22, which increases the space for holding gas. When not in use, the extension portion 22 will maintain its original unexpanded state, occupying very little space or almost no space. While ensuring that storage and transportation difficulties are not increased, the gas storage performance of the second bag body 20 is improved, and the risk of the air bag bursting due to the large amount of gas produced during the first charge and discharge of the battery cell is reduced.
[0033] It can be understood that the main body 21 and the extension part 22 are sealed and connected. The main body 21 and the extension part 22 can be independent structures respectively, and a sealed connection is formed by a fixed connection, such as a connection generated by hot pressing, or a connection by an adhesive, etc. The main body 21 and the extension part 22 can also be an integrated structure.
[0034] In some preferred embodiments, the main body 21 and the extension portion 22 are an integrated structure, which has better sealing performance and reduces the possibility of air leakage.
[0035] In some embodiments of the present application, the extension portion 22 is provided on at least one of the two thickness surfaces of the main body 21. That is, the extension portion 22 can be provided on only one of the two thickness surfaces of the main body 21, or can be provided on both thickness surfaces of the main body 21. The larger area of the two thickness surfaces of the main body 21 facilitates the design of the length and width of the extension portion 22, as well as the opening design of the gap structure of the extension portion 22. Furthermore, while maintaining the overall length of the second bag body 20 relative to the overall length of existing air bags, the gas holding capacity of the second bag body 20 can be increased. During processing, the existing equipment can continue to be used without changing the limit size or limit fixtures, thus saving costs.
[0036] See also Figure 3 In some embodiments of the present application, when the second bag body 20 is in an expanded state, the inner wall of the chamber 23 corresponding to the side of the second bag body 20 provided with the extension portion 22 is stepped, so that the chamber 23 gradually expands from the side close to the first bag body 10 toward the direction away from the first bag body 10. The side of the chamber 23 close to the first bag body 10 is the side connected to the gas channel 24. On the one hand, after the gas enters the chamber 23, the second bag body 20 gradually expands. When the chamber 23 is filled with gas, the cavity wall stretches, causing the gas channel 24 to close, thereby achieving the effect of blocking gas backflow. On the other hand, the volume of the side of the chamber 23 far from the first bag body 10 is larger than the side close to the first bag body 10, so the pressure on the inflowing gas is smaller, and the gas is more likely to flow to the side with a larger volume, thereby playing a diversion role.
[0037] In some embodiments of the present application, the extension portion 22 is connected to the surface of the main body 21 and has a frilled and / or raised shape. When the extension portion 22 is frilled, the side surface of the extension portion 22 forms an angle with the surface of the main body 21, which is greater than or equal to 0° and less than 90°. The top end surface of the extension portion 22 can be flat, curved, or bent. When the extension portion 22 is raised, its side surface extends vertically, and the top end surface can be flat or curved.
[0038] It can be understood that when the extension portion 22 is in a frill shape and is in an unstretched state, there is an overlapping portion between the main body 21 and the extension portion 22, such as Figure 2 As shown, Figure 2 The raised portion in the middle is the overlapping portion, and part of the extension portion 22 may be attached to the surface of the main body 21, which can reduce the space occupied during storage and transportation.
[0039] Assuming the width of the main body 21 is L, and there is an overlap between the main body 21 and the extension 22, with the sum of the widths of the overlapping portions being X, then 0 < X < L. There can be one or more extensions 22. When there is only one extension 22, the sum of the widths of the single extension 22 and the main body 21 is X. When there are multiple extensions 22, the sum of the widths of the overlapping portions of each extension 22 with the main body 21 is X. The relationship 0 < X < L ensures that the overall length of the second bag body 20 is not increased by the extensions 22, allowing the original processing equipment to continue to be used.
[0040] In some embodiments of the present application, Figure 1 As shown, the number of the extensions 22 is n, where n is a positive integer. The width of the overlapping portion of each extension 22 and the main body 21 is x, and the widths of the extensions 22 are l1, l2, l3...l n , where l1, l2, l3...l n <L,l1+l2+l3…l n +(n-1)x=L.
[0041] In some embodiments of the present application, a sealed edge is provided at the connection between the main body 21 and the first bag body 10, the width of the sealed edge is b, the number of extensions 22 is n, n is a positive integer, and the width of the overlapping part of each extension 22 and the main body 21 is x, where b<x.
[0042] In some embodiments of the present application, assuming that the hollow structure of the main body 21 can accommodate a gas volume of V0, the width of the main body 21 is L, the gas volume that the second bag body 20 can accommodate is V1, 0.9(n(xb)+L)V0 / L≤V1≤1.1(n(xb)+L)V0 / L.
[0043] In some embodiments of the present application, the length of the gas channel 24 is a, and the width of the main body 21 is K, where a<K, which reserves space for edge sealing to avoid the problem of gas backflow caused by the gas channel 24 being too large and difficult to seal.
[0044] Optionally, the gas channel 24 and the edge seal are provided at the connection between the first bag body 10 and the main body 21. In some embodiments, the edge seal is provided on one side or both sides of the gas channel 24 along the length direction of the connection, such as Figure 1 In the example, the sealing edges are respectively provided on both sides of the gas channel 24 .
[0045] It can be understood that the gas channel 24 can be one or more. When the number of gas channels 24 is multiple, the multiple gas channels 24 can be arranged regularly, irregularly, or staggered, etc., and can mainly connect the chamber 23 of the first bag body 10 and the second bag body 20.
[0046] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A soft-package battery air bag, characterized by: include: A first bag body (10), the first bag body (10) being used to accommodate a battery cell; as well as A second bag body (20), the second bag body (20) comprises a main body (21) and an extendable extension (22), the hollow structure of the main body (21) and the void structure of the extension (22) together forming a chamber (23) for storing the formed gas; the main body (21) is connected to the first bag body (10), a gas channel (24) is formed at the connection between the main body (21) and the first bag body (10), and the chamber (23) and the first bag body (10) are communicated with each other through the gas channel (24).
2. The soft package battery air bag according to claim 1, characterized in that: The extension portion (22) is provided on at least one of the two thickness sides of the main body (21).
3. The soft package battery air bag according to claim 2, characterized in that: In the expanded state of the second bag body, the second bag body (20) is provided with a side of the extension portion (22), and the inner wall of the corresponding chamber (23) is stepped, so that the chamber (23) gradually expands from the side close to the first bag body (10) to the direction away from the first bag body (10).
4. The soft package battery air bag according to claim 1, wherein: The extension portion (22) is connected to the surface of the main body (21) and is in a frill and / or convex shape.
5. The soft package battery air bag according to any one of claims 1 to 3, characterized in that: The width of the main body (21) is L. There is an overlapping portion between the main body (21) and the extension portion (22). The sum of the widths of the overlapping portions is X, and 0<X<L.
6. The soft package battery air bag according to claim 5, characterized in that: The number of the extensions (22) is n, where n is a positive integer. The width of the overlapping portion of each extension and the main body is x, and the widths of the extensions (22) are l1, l2, l3...l n , where l1, l2, l3...l n <L,l1+l2+l3…l n +(n-1)x=L.
7. The soft package battery air bag according to claim 5, characterized in that: A sealing edge (25) is provided at the connection between the main body (21) and the first bag body (10), the width of the sealing edge (25) is b, the number of the extension parts (22) is n, n is a positive integer, and the width of the overlapping part of each extension part (22) and the main body (21) is x, wherein b<x.
8. The soft package battery air bag according to claim 7, characterized in that: Assuming that the hollow structure of the main body (21) can accommodate a gas volume of V0, the width of the main body (21) is L, the gas volume that the second bag body (20) can accommodate is V1, 0.9(n(xb)+L)V0 / L≤V1≤1.1(n(xb)+L)V0 / L.
9. The soft package battery air bag according to claim 1, characterized in that: The length of the gas channel (24) is a, and the width of the main body (21) is K, wherein a<K.
10. The soft package battery air bag according to claim 1, characterized in that: The main body (21) and the extension portion (22) are an integrated structure.