A soft-pack battery structure and power supply device

Abstract

This utility model provides a soft-pack battery structure and power device, relating to the field of battery technology. The soft-pack battery structure includes a wound cell, a soft-pack cylindrical body, and a cover. The wound cell is provided with a current collector. The soft-pack cylindrical body wraps around the wound cell and includes an aluminum film portion and an aluminum foil portion. The aluminum foil portion extends from the aluminum film portion along a first direction, which is the length direction of the soft-pack cylindrical body. The aluminum foil portion is arranged around the periphery of the cover to connect the end of the cover to the soft-pack cylindrical body. The cover is welded to the current collector. This utility model, on the one hand, reduces the overall weight of the battery by wrapping the aluminum foil portion around the wound cell; on the other hand, the aluminum film portion provides better protection for the wound cell, ensuring the current collector connection and preventing short circuits or poor contact, thus achieving the purpose of sealing the cover. This balances the battery's lightweight design and sealing protection, thereby improving the battery's performance.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202521685156.8, filed on August 8, 2025, entitled "A Soft Pack Battery Structure and Power Application Device". Technical Field

[0003] This utility model relates to the field of battery technology, and more specifically, to a soft-pack battery structure and an electrical device. Background Technology

[0004] Pouch batteries are widely used in power batteries and energy storage systems. In the event of thermal runaway or physical damage, pouch batteries will bulge and crack instead of exploding directly, thus reducing safety hazards. However, common pouch battery manufacturing processes are difficult, and inadequate sealing can easily occur during processing, leading to electrolyte leakage or decomposition, which hinders the realization of the lightweight advantages of pouch batteries. Utility Model Content

[0005] The purpose of this utility model is to provide a soft-pack battery structure and power device. On the one hand, the aluminum foil part wrapping the wound battery cell can reduce the overall weight of the battery. On the other hand, the aluminum film part can provide better protection for the wound battery cell, ensure the current collector connection and avoid short circuits or poor contact, thus taking into account both the lightweight and sealing protection effect of the battery.

[0006] The first aspect of this utility model provides a pouch battery structure, which includes: A wound battery cell, wherein the wound battery cell is provided with a current collector; A flexible cylindrical body is wrapped around the wound battery cell. The flexible cylindrical body is provided with an aluminum film portion and an aluminum foil portion. The aluminum foil portion is led out from the aluminum film portion along a first direction, where the first direction is the length direction of the flexible cylindrical body. The cover body has an aluminum foil portion arranged around its periphery to connect the cover body to the end of the soft-pack cylinder body, and the cover body is welded to the manifold.

[0007] In one possible embodiment of the present invention, the aluminum foil portion includes a first aluminum foil portion and a second aluminum foil portion, and the cover includes a first cover and a second cover. The first cover and the second cover are respectively installed at opposite ends of the flexible tube body, the first aluminum foil portion is disposed corresponding to the first cover, and the second aluminum foil portion is disposed corresponding to the second cover.

[0008] In one possible embodiment of the present invention, the aluminum film portion is located between the first aluminum foil portion and the second aluminum foil portion along the first direction.

[0009] In one possible embodiment of the present invention, a first current collector and a second current collector are respectively provided at opposite ends of the wound battery cell, a first welding part is provided at the center of the first cover, a second welding part is provided at the center of the second cover, the first current collector is welded to the first welding part, and the second current collector is welded to the second welding part.

[0010] In one possible embodiment of the present invention, the aluminum film portion includes a first protective layer, an aluminum foil layer, and a second protective layer stacked in the direction from the flexible cylindrical body to the wound battery cell.

[0011] In one possible embodiment of the present invention, the first protective layer is a single-layer structure or a double-layer structure, and the second protective layer is a single-layer structure or a double-layer structure.

[0012] In one possible embodiment of this utility model, the first protective layer is made of PET or PBT, and the second protective layer is made of CPP or PP.

[0013] In one possible embodiment of this utility model, the thickness D of the aluminum foil portion satisfies: 100um≤D≤600um.

[0014] In one possible embodiment of this utility model, the first cover or the second cover is provided with a liquid injection vent hole and a liquid injection vent cap, wherein the liquid injection vent cap is detachably installed on the liquid injection vent hole.

[0015] The second aspect of this utility model provides an electrical device, including the soft-pack battery structure described in any of the above embodiments.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The soft-pack battery structure and power device provided by this utility model have an aluminum film part and an aluminum foil part. On the one hand, the aluminum foil part wraps around the wound battery cell, which can reduce the overall weight of the battery. On the other hand, the aluminum film part can provide better protection for the wound battery cell, blocking external moisture and air from entering the cavity, preventing electrolyte decomposition and resisting external physical damage. The cover is installed at the end of the soft-pack battery, and the current collector is welded to the cover to ensure the connection of the current collector and avoid short circuits or poor contact. The aluminum foil part is led out from the aluminum film part along the length of the soft-pack battery, so that the flexible aluminum foil part can be wrapped around the cover to achieve the purpose of sealing the cover, taking into account both the lightweight and sealing protection effect of the battery, thereby improving the product performance of the battery. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the soft-pack battery structure provided in some embodiments of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the soft-pack battery structure provided in some embodiments of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the cover structure of the soft-pack battery structure provided in some embodiments of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the cover structure of the soft-pack battery structure provided in some embodiments of this utility model. Figure 2 ; Figure 5 This is a cross-sectional view of the aluminum film portion of a soft-pack battery structure provided in some embodiments of the present invention.

[0019] Explanation of key component symbols; 100-Pouch battery structure; 110-Wound cell; 111-First current collector; 112-Second current collector; 120-Pouch body; 121-Aluminum film section; 1211-First protective layer; 1212-Aluminum foil layer; 1213-Second protective layer; 122-First aluminum foil section; 123-Second aluminum foil section; 130-Cover; 131-First cover; 1311-First welding section; 1312-Injection and venting hole; 1313-Injection and venting cap; 132-Second cover; 1321-Second welding section; X-First direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 based on the specific circumstances.

[0026] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] refer to Figure 1 As shown, an embodiment of this application provides a pouch battery structure 100, which includes a wound battery cell 110, a pouch body 120, and a cover 130.

[0028] Specifically, in combination Figure 1 and Figure 2 As shown, the wound cell 110 is provided with a current collector, and the soft-pack cylindrical body 120 is wrapped around the wound cell 110. The soft-pack cylindrical body 120 is provided with an aluminum film portion 121 and an aluminum foil portion. On the one hand, the aluminum foil portion wrapped around the wound cell 110 can reduce the overall weight of the battery. On the other hand, the aluminum film portion 121 can provide better protection for the wound cell 110, blocking external moisture and air from entering the containment cavity, preventing electrolyte decomposition, and resisting external physical damage.

[0029] In this embodiment, the aluminum foil portion extends from the aluminum film portion 121 along the first direction X, where the first direction X is the length direction of the flexible cylindrical body 120. The aluminum foil portion is arranged around the periphery of the cover body 130 so that the cover body 130 is connected to the end of the flexible cylindrical body 120. The cover body 130 is welded to the current collector and is installed at the end of the flexible cylindrical body 120. The current collector is welded to the cover body 130 to ensure the connection of the current collector and avoid short circuits or poor contact. The aluminum foil portion extends from the aluminum film portion 121 along the length direction of the flexible cylindrical body 120, so that the flexible aluminum foil portion can be arranged around the cover body 130 to achieve the purpose of sealing the cover body 130, taking into account both the lightweight and sealing protection effect of the battery.

[0030] Understandably, pouch batteries are characterized by high safety, lightweight, excellent electrochemical performance, and flexible and diverse structures. In the event of thermal runaway or puncture, the pouch body 120 can provide a buffer space for the battery cell and release internal pressure through expansion and deformation. This usually manifests as fire or smoke, but can prevent direct explosion.

[0031] refer to Figure 1 and Figure 2 As shown, the pouch battery structure 100 has a first direction X. For example, the first direction X is defined as the height direction of the pouch battery structure 100. It is understood that the above definitions are only for ease of understanding the relative positional relationships of the parts in the pouch battery structure 100 and should not be construed as limitations on this application.

[0032] In one embodiment, alternatively, referencing Figure 1 and Figure 2As shown, the aluminum foil portion includes a first aluminum foil portion 122 and a second aluminum foil portion 123, and the cover 130 includes a first cover 131 and a second cover 132. The first cover 131 and the second cover 132 are respectively installed at opposite ends of the flexible cylindrical body 120. The first aluminum foil portion 122 is disposed corresponding to the first cover 131, and the second aluminum foil portion 123 is disposed corresponding to the second cover 132. The flexible cylindrical body 120 has a hollow structure. The first cover 131 and the second cover 132 respectively enclose the openings at opposite ends of the flexible cylindrical body 120. The first aluminum foil portion 122 is disposed around the circumference of the first cover 131 to wrap the first cover 131, and the second aluminum foil portion 123 is disposed around the circumference of the second cover 132 to wrap the second cover 132, thereby improving airtightness and preventing electrolyte leakage.

[0033] Optionally, combined Figure 2 and Figure 5 As shown, the aluminum film portion 121 includes a first protective layer 1211, an aluminum foil layer 1212, and a second protective layer 1213 stacked in the direction from the flexible cylindrical body 120 to the wound battery cell 110. Correspondingly, the aluminum film portion 121 has a stacked structure, with the aluminum foil layer 1212 located between the first protective layer 1211 and the second protective layer 1213. The first protective layer 1211 is the outermost layer, and the second protective layer 1213 is located on the side of the aluminum foil layer 1212 closest to the wound battery cell 110. Both the first protective layer 1211 and the second protective layer 1213 can provide good protection and control the temperature change of the wound battery cell 110, thus extending its cycle life. For example, the aluminum film portion 121 is made of aluminum-plastic film.

[0034] In summary, the soft-pack battery structure 100 has an aluminum film portion 121 and an aluminum foil portion in its soft-pack cylindrical body 120. On the one hand, the aluminum foil portion wraps around the wound cell 110, which can reduce the overall weight of the battery. On the other hand, the aluminum film portion 121 can provide better protection for the wound cell 110, blocking external moisture and air from entering the containment cavity, preventing electrolyte decomposition, and resisting external physical damage. The cover 130 is installed at the end of the soft-pack cylindrical body 120, and the current collector is welded to the cover 130 to ensure the current collector connection and avoid short circuits or poor contact. The aluminum foil portion extends from the aluminum film portion 121 along the length of the soft-pack cylindrical body 120, so that the flexible aluminum foil portion can be wrapped around the cover 130 to achieve the purpose of sealing the cover 130, taking into account both the lightweight and sealing protection effect of the battery, thereby improving the product performance of the battery.

[0035] refer to Figure 1 As shown, an embodiment of this application provides another pouch battery structure 100, which includes a wound cell 110, a pouch body 120, and a cover 130.

[0036] Specifically, in combination Figure 1 and Figure 2 As shown, the wound battery cell 110 is provided with a current collector, and a flexible cylindrical body 120 is wrapped around the wound battery cell 110. The flexible cylindrical body 120 is provided with an aluminum film portion 121 and an aluminum foil portion. The aluminum foil portion extends from the aluminum film portion 121 along a first direction X, where the first direction X is the length direction of the flexible cylindrical body 120. The aluminum foil portion is arranged around the periphery of the cover 130 so that the cover 130 is connected to the end of the flexible cylindrical body 120. The cover 130 is welded to the current collector. The flexible cylindrical body 120 is provided with an aluminum film portion 121 and an aluminum foil portion, on the one hand, the aluminum foil portion wraps around the wound battery cell. 110 can reduce the overall weight of the battery. On the other hand, the aluminum film portion 121 can provide better protection for the wound cell 110, blocking external moisture and air from entering the containment cavity, preventing electrolyte decomposition and resisting external physical damage. The cover 130 is installed at the end of the soft-pack cylinder 120, and the current collector is welded to the cover 130 to ensure the current collector connection and avoid short circuits or poor contact. The aluminum foil portion is led out from the aluminum film portion 121 along the length direction of the soft-pack cylinder 120, so that the flexible aluminum foil portion can be wrapped around the cover 130 and achieve the purpose of sealing the cover 130, taking into account both the lightweight and sealing protection effect of the battery.

[0037] In one embodiment, alternatively, referencing Figure 1 and Figure 2 As shown, the aluminum foil portion includes a first aluminum foil portion 122 and a second aluminum foil portion 123, and the cover 130 includes a first cover 131 and a second cover 132. The first cover 131 and the second cover 132 are respectively installed at opposite ends of the flexible cylindrical body 120. The first aluminum foil portion 122 is disposed corresponding to the first cover 131, and the second aluminum foil portion 123 is disposed corresponding to the second cover 132. The flexible cylindrical body 120 has a hollow structure. The first cover 131 and the second cover 132 respectively enclose the openings at opposite ends of the flexible cylindrical body 120. The first aluminum foil portion 122 is disposed around the circumference of the first cover 131 to wrap the first cover 131, and the second aluminum foil portion 123 is disposed around the circumference of the second cover 132 to wrap the second cover 132. The connection position between the flexible cylindrical body 120 and the first cover 131 is then sealed by a combination of "laser welding + hot melt adhesive" to improve airtightness and prevent electrolyte leakage.

[0038] Optionally, such as Figure 1As shown, along the first direction X, the aluminum film portion 121 is located between the first aluminum foil portion 122 and the second aluminum foil portion 123. Along the height direction of the soft-pack battery structure 100, the first aluminum foil portion 122, the aluminum film portion 121, and the second aluminum foil portion 123 are arranged sequentially. The aluminum film portion 121 is located in the middle of the soft-pack body 120. The aluminum film portion 121 increases the mechanical strength of the soft-pack body 120 and reduces the loosening of the wound cell 110. The aluminum film portion 121 leads out the first aluminum foil portion 122 and the second aluminum foil portion 123 from both ends along the height direction of the soft-pack battery structure 100, so that the heat generated at the position of the aluminum film portion 121 can be conducted through the first aluminum foil portion 122 and the second aluminum foil portion 123 to optimize the heat conduction path of the battery.

[0039] Optionally, refer to Figure 3 and Figure 4 As shown, the wound battery cell 110 has a first current collector 111 and a second current collector 112 respectively at its opposite ends. The first cover 131 has a first welding part 1311 at its center, and the second cover 132 has a second welding part 1321 at its center. The first current collector 111 is welded to the first welding part 1311, and the second current collector 112 is welded to the second welding part 1321. The first current collector 111 is fixedly connected to the center of the first cover 131 by laser welding or resistance welding. On the one hand, the second current collector 112 is fixedly connected to the center of the second cover 132 by laser welding or resistance welding, so that the current flows directly from the center of the battery cell to the first cover 131 or the second cover 132, thereby reducing the current path length and reducing the internal resistance. On the other hand, welding the current collector to the center position may reduce the risk of current collector displacement or breakage caused by the expansion of the wound battery cell. For example, the first current collector 111 is a positive current collector, and the corresponding second current collector 112 is a negative current collector.

[0040] Optionally, combined Figure 2 and Figure 5 As shown, the aluminum film portion 121 includes a first protective layer 1211, an aluminum foil layer 1212, and a second protective layer 1213 stacked in the direction from the flexible cylindrical body 120 to the wound battery cell 110. Correspondingly, the aluminum film portion 121 has a stacked structure, with the aluminum foil layer 1212 located between the first protective layer 1211 and the second protective layer 1213. The first protective layer 1211 is the outermost layer, and the second protective layer 1213 is located on the side of the aluminum foil layer 1212 closest to the wound battery cell 110. Both the first protective layer 1211 and the second protective layer 1213 can provide good protection and control the temperature change of the wound battery cell 110, thus extending its cycle life. For example, the aluminum film portion 121 is made of aluminum-plastic film.

[0041] Optionally, the first protective layer 1211 may be a single-layer structure or a double-layer structure, and the second protective layer 1213 may be a single-layer structure or a double-layer structure. The first protective layer 1211 may be a single-layer structure or a double-layer structure. The first protective layer 1211 may be a nylon layer, and the second protective layer 1213 may be a single-layer structure or a double-layer structure. The second protective layer 1213 may be a heat-sealing layer to achieve better protection.

[0042] For example, the first protective layer 1211 is made of PET or PBT. PET (polyethylene terephthalate) has high strength, high temperature resistance, and smooth surface, making it suitable as an outer protective layer. PBT (polybutylene terephthalate) has high mechanical strength, chemical resistance, and electrical insulation properties. The second protective layer 1213 is made of CPP or PP. CPP (cast polypropylene) has excellent heat-sealing performance and good flexibility. PP (polypropylene) has high temperature resistance and low manufacturing cost.

[0043] In one embodiment, optionally, the thickness D of the aluminum foil portion satisfies: 100um ≤ D ≤ 600um, that is, the thickness D of the aluminum foil portion is greater than or equal to 100um and less than or equal to 600um. It can be understood that the thickness D of the aluminum foil portion satisfies: 100um ≤ D ≤ 600um, with the thickness D greater than or equal to 100um. Making the thickness D of the aluminum foil portion greater than or equal to 100um improves barrier properties, preventing electrolyte leakage due to microcracks or processing defects, and enhances puncture resistance, preventing breakage during electrode expansion or external impact. Furthermore, making the thickness D of the aluminum foil portion less than or equal to 600um avoids increasing material costs when the thickness D is too large, and may also cause difficulties in the battery injection molding process due to excessive rigidity. The thickness D of the aluminum foil portion can be any value between 100um and 600um, for example, the thickness D of the aluminum foil portion is 100um, 150um, 300um, 400um, 500um, 600um, etc.

[0044] In one embodiment, reference Figure 2As shown, the first cover 131 or the second cover 132 is provided with an injection vent 1312 and an injection vent cap 1313. The injection vent cap 1313 is detachably installed on the injection vent 1312. The injection vent cap 1313 is used to close the injection vent 1312 and to release gas promptly after opening the injection vent 1312, preventing leakage of the soft-pack battery due to gas expansion, or even thermal runaway, thus ensuring stable battery operation. Electrolyte can also be injected into the battery through the injection vent 1312. In another embodiment, the injection vent cap 1313 can be sealed on the injection vent 1312, allowing gas inside the battery to be released through the formation process of the injection vent 1312.

[0045] An embodiment of this utility model also provides an electrical device, including the pouch battery structure 100 in the above embodiment. The electrical device including the pouch battery structure 100 has all the beneficial effects of the pouch battery structure 100, which will not be described in detail here.

[0046] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0047] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A soft-pack battery structure, characterized in that, include: A wound battery cell, wherein the wound battery cell is provided with a current collector; A flexible cylindrical body is wrapped around the wound battery cell. The flexible cylindrical body is provided with an aluminum film portion and an aluminum foil portion. The aluminum foil portion is led out from the aluminum film portion along a first direction, where the first direction is the length direction of the flexible cylindrical body. The cover body has an aluminum foil portion arranged around its periphery to connect the cover body to the end of the soft-pack cylinder body, and the cover body is welded to the manifold.

2. The soft-pack battery structure according to claim 1, characterized in that, The aluminum foil portion includes a first aluminum foil portion and a second aluminum foil portion, and the cover includes a first cover and a second cover. The first cover and the second cover are respectively installed at opposite ends of the flexible tube body. The first aluminum foil portion is disposed corresponding to the first cover, and the second aluminum foil portion is disposed corresponding to the second cover.

3. The soft-pack battery structure according to claim 2, characterized in that, The aluminum film portion is located between the first aluminum foil portion and the second aluminum foil portion along the first direction.

4. The soft-pack battery structure according to claim 2, characterized in that, The wound battery cell has a first current collector and a second current collector respectively at its two ends. The first cover has a first welding part at its center and the second cover has a second welding part at its center. The first current collector is welded to the first welding part and the second current collector is welded to the second welding part.

5. The pouch battery structure according to any one of claims 1 to 4, characterized in that, The aluminum film portion includes a first protective layer, an aluminum foil layer, and a second protective layer stacked in the direction from the flexible cylindrical body to the wound battery cell.

6. The soft-pack battery structure according to claim 5, characterized in that, The first protective layer is a single-layer structure or a double-layer structure, and the second protective layer is a single-layer structure or a double-layer structure.

7. The soft-pack battery structure according to claim 5, characterized in that, The first protective layer is made of PET or PBT, and the second protective layer is made of CPP or PP.

8. The pouch battery structure according to any one of claims 1 to 4, characterized in that, The thickness D of the aluminum foil portion satisfies: 100um ≤ D ≤ 600um.

9. The pouch battery structure according to any one of claims 2 to 4, characterized in that, The first cover or the second cover is provided with a liquid injection vent hole and a liquid injection vent cap, and the liquid injection vent cap is detachably installed on the liquid injection vent hole.

10. An electrical appliance, characterized in that, Includes the pouch battery structure as described in any one of claims 1 to 9.

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