A humidifying sheet

Abstract

This utility model discloses a humidity regulating sheet, comprising an encapsulation layer, a moisture-absorbing layer, and a semi-permeable layer arranged sequentially from bottom to top. The encapsulation layer consists of a first high-temperature heat-sealable film and an adhesive, with the adhesive disposed on the bottom surface of the first high-temperature heat-sealable film. The semi-permeable layer is formed by hot-pressing a second high-temperature heat-sealable film and a breathable and waterproof film together. The area of ​​the moisture-absorbing layer is smaller than the area of ​​the semi-permeable layer and the first high-temperature heat-sealable film. The bottom edge of the semi-permeable layer is joined to the top edge of the first high-temperature heat-sealable film by hot-pressing, thereby encapsulating the moisture-absorbing layer between the semi-permeable layer and the encapsulation layer. The adhesive is used to fix the humidity regulating sheet in place. This utility model can significantly reduce encapsulation costs while ensuring stable water absorption and humidity regulating performance of the humidity regulating sheet.

Description

Technical Field

[0001] This utility model belongs to the field of humidity regulation technology for new energy vehicle battery packs, and specifically relates to a humidity regulating sheet. Background Technology

[0002] The safety of new energy vehicles has always been a major concern, with the safe operation of the battery pack being particularly crucial. Therefore, ensuring a stable internal environment for the battery pack is paramount. Under varying weather conditions or extreme environments, the humidity inside the battery pack can fluctuate significantly. Excessive humidity can lead to condensation, potentially causing corrosion and aging, and in severe cases, even electrical short circuits, resulting in fires and seriously threatening personal safety.

[0003] For the humidity control of the internal environment of battery packs, the breathable and waterproof membrane (PTFE membrane) used in the encapsulation of fiber humidity control products on the market is expensive. Furthermore, a buffer layer of equal area to the breathable and waterproof membrane is usually attached to the membrane, completely covering and protecting it. Specifically, 70-80% of the breathable and waterproof membrane is bonded to the corresponding buffer layer with adhesive, while 20-30% remains unbonded, creating ventilation gaps that allow moisture to escape or enter the fiber humidity control product. This results in a utilization rate of only 20-30% for the breathable and waterproof membrane, leading to waste. Additionally, the high cost of the encapsulation materials for fiber humidity control products also limits their further application in the new energy vehicle industry. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a humidity regulating sheet that can greatly reduce the packaging cost while ensuring the stability of the water absorption and humidity regulating performance of the humidity regulating sheet.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A humidity regulating sheet includes an encapsulation layer, a moisture-absorbing layer, and a semi-permeable layer arranged sequentially from bottom to top. The encapsulation layer consists of a first high-temperature heat-sealable film and an adhesive, with the adhesive disposed on the bottom surface of the first high-temperature heat-sealable film. The semi-permeable layer is formed by hot-pressing a second high-temperature heat-sealable film and a breathable and waterproof film together. The area of ​​the moisture-absorbing layer is smaller than the area of ​​the semi-permeable layer and the first high-temperature heat-sealable film. The bottom edge of the semi-permeable layer is joined to the top edge of the first high-temperature heat-sealable film by hot-pressing to encapsulate the moisture-absorbing layer between the semi-permeable layer and the encapsulation layer. The adhesive is used to fix the humidity regulating sheet in place.

[0007] Furthermore, the first high-temperature heat-sealing film and the adhesive have the same area, and the adhesive is located directly below the first high-temperature heat-sealing film. The semi-permeable layer and the encapsulation layer have the same area. The moisture-absorbing layer is located directly above the encapsulation layer, and the semi-permeable layer is located directly above the moisture-absorbing layer.

[0008] Furthermore, the semi-permeable layer is formed by hot-pressing together a second high-temperature resistant heat-sealing film and a breathable waterproof film. An installation window is provided on the second high-temperature resistant heat-sealing film, and the breathable waterproof film is hot-pressed together with the second high-temperature resistant heat-sealing film at the installation window.

[0009] Furthermore, the semi-permeable layer is formed by hot-pressing and splicing two second high-temperature resistant heat-sealing films and one breathable and waterproof film. The width of one of the second high-temperature resistant heat-sealing films in the semi-permeable layer along the front-back direction is equal to the length of the other second high-temperature resistant heat-sealing film along the front-back direction. The length of the breathable and waterproof film along the front-back direction is equal to the width of one of the second high-temperature resistant heat-sealing films along the front-back direction. The left edge of the breathable and waterproof film is hot-pressed and spliced ​​with the right edge of the left second high-temperature resistant heat-sealing film, and the right edge of the breathable and waterproof film is hot-pressed and spliced ​​with the left edge of the right second high-temperature resistant heat-sealing film.

[0010] Furthermore, the semi-permeable layer is formed by hot-pressing together a second high-temperature heat-sealing film and a breathable waterproof film, wherein the length of the breathable waterproof film in the front-to-back direction is equal to the width of the second high-temperature heat-sealing film in the front-to-back direction.

[0011] Furthermore, the absorbent layer is formed from a single piece of absorbent cotton; or, the absorbent layer is formed by stacking multiple pieces of absorbent cotton of equal area from bottom to top.

[0012] Furthermore, the absorbent cotton is polyester fiber absorbent cotton.

[0013] Furthermore, the breathable and waterproof membrane is a PTFE membrane.

[0014] Furthermore, both the first high-temperature heat-sealing film and the second high-temperature heat-sealing film are PET films.

[0015] Furthermore, the adhesive is a double-sided adhesive.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The humidity regulating sheet of this utility model includes an encapsulation layer, a moisture-absorbing layer, and a semi-permeable layer arranged sequentially from bottom to top. The encapsulation layer consists of a first high-temperature heat-sealing film and an adhesive, with the adhesive disposed on the bottom surface of the first high-temperature heat-sealing film. The semi-permeable layer is formed by hot-pressing a second high-temperature heat-sealing film and a breathable and waterproof film together. The area of ​​the moisture-absorbing layer is smaller than the area of ​​the semi-permeable layer and the first high-temperature heat-sealing film. The bottom edge of the semi-permeable layer is connected to the top edge of the first high-temperature heat-sealing film by hot-pressing to encapsulate the moisture-absorbing layer between the semi-permeable layer and the encapsulation layer. The adhesive is used to fix the humidity regulating sheet in place. Because the semi-permeable layer is formed by hot-pressing a second high-temperature resistant heat-sealing film and a breathable and waterproof film, the breathable and waterproof film on the semi-permeable layer can fully perform its breathable function. In contrast, the breathable and waterproof film in commercially available fiber moisture-regulating sheets in the background technology only partially performs its breathable function. Thus, even if the area of ​​the semi-permeable layer in this moisture-regulating sheet is equal to the area of ​​the breathable and waterproof film in commercially available fiber moisture-regulating sheets in the background technology, the area of ​​the breathable and waterproof film used in the semi-permeable layer of this moisture-regulating sheet is smaller than that of the breathable and waterproof film in commercially available fiber moisture-regulating sheets in the background technology. Since the cost of the second high-temperature resistant heat-sealing film is lower than that of the breathable and waterproof film, if the area of ​​the breathable and waterproof film on the semi-permeable layer of this moisture-regulating sheet is equal to the area of ​​the breathable and waterproof film in commercially available fiber moisture-regulating sheets in the background technology, this moisture-regulating sheet can greatly reduce the packaging cost while maintaining the same breathability ratio. Moreover, since the breathability ratio remains unchanged, the water absorption and moisture retention performance of this moisture-regulating sheet remains stable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the layered structure of the humidification sheet in one embodiment of the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the semi-permeable layer;

[0020] Figure 3 This is a schematic diagram of the layered structure of the humidification sheet in another embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the semi-permeable layer;

[0022] Figure 5 This is a schematic diagram of the structure of the semi-permeable layer in another embodiment of the present invention.

[0023] The following are the labels in the figure: 1. Encapsulation layer, 101. First high-temperature heat-sealing film, 102. Adhesive, 2. Moisture-absorbing layer, 201. Moisture-absorbing cotton, 3. Semi-breathable layer, 301. Second high-temperature heat-sealing film, 302. Breathable and waterproof film. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0025] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, 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. They 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 on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 according to the specific circumstances.

[0027] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] like Figure 1 and Figure 3 As shown, a humidity regulating sheet includes an encapsulation layer 1, a moisture-absorbing layer 2, and a semi-permeable layer 3 arranged sequentially from bottom to top; the encapsulation layer 1 is composed of a first high-temperature heat-sealable film 101 and an adhesive 102, with the adhesive 102 disposed on the bottom surface of the first high-temperature heat-sealable film 101; the semi-permeable layer 3 is formed by hot-pressing a second high-temperature heat-sealable film 301 and a breathable and waterproof film 302, see Figures 1-5 The area of ​​the moisture-absorbing layer 2 is smaller than that of the semi-permeable layer 3 and the first high-temperature heat-sealing film 101. The bottom edge of the semi-permeable layer 3 and the top edge of the first high-temperature heat-sealing film 101 are connected together by heat pressing to encapsulate the moisture-absorbing layer 2 between the semi-permeable layer 3 and the encapsulation layer 1. The adhesive 102 is used to fix the humidity-regulating sheet.

[0029] The moisture-absorbing layer 2 absorbs moisture from the ambient air around the humidity-regulating sheet or releases moisture into the ambient air through the breathable and waterproof membrane 302 in the semi-permeable layer 3, thereby controlling the humidity of the environment. When the moisture-absorbing layer 2 reaches its limit, any moisture re-entering the humidity-regulating sheet easily turns into flowing water. The breathable and waterproof membrane 302 in the semi-permeable layer 3 prevents the flowing water generated inside the humidity-regulating sheet from flowing out into the environment. Additionally, the second high-temperature heat-sealing film 301 in the semi-permeable layer 3 and the first high-temperature heat-sealing film 101 in the encapsulation layer 1 also prevent the flowing water generated inside the humidity-regulating sheet from flowing out. The breathable and waterproof membrane 302 is a PTFE membrane, while the first and second high-temperature heat-sealing films 101 and 301 are both PET films.

[0030] Since the semi-permeable layer 3 is formed by hot-pressing a second high-temperature resistant heat-sealing film 301 and a breathable and waterproof membrane 302, the breathable and waterproof membrane 302 on the semi-permeable layer 3 can fully perform its breathable function. In contrast, the breathable and waterproof membrane 302 in commercially available fiber-based humidity-regulating sheets in the background technology only partially performs its breathable function. Therefore, while the area of ​​the semi-permeable layer 3 in this humidity-regulating sheet is equal to the area of ​​the breathable and waterproof membrane 302 in commercially available fiber-based humidity-regulating sheets in the background technology, the area of ​​the breathable and waterproof membrane 302 used on the semi-permeable layer 3 in this humidity-regulating sheet is smaller than that in commercially available fiber-based humidity-regulating sheets in the background technology. The area of ​​the breathable and waterproof membrane 302 in the wet sheet product is such that, since the cost of the second high-temperature heat-sealing film 301 is lower than the cost of the breathable and waterproof membrane 302, if the area of ​​the breathable and waterproof membrane 302 on the semi-breathable layer 3 in this moisture-conditioning sheet is equal to the area of ​​the breathable and waterproof membrane 302 in the fiber moisture-conditioning sheet products on the market in the background technology, then compared with the fiber moisture-conditioning sheet products on the market in the background technology, this moisture-conditioning sheet can greatly reduce the packaging cost while ensuring that the air permeability ratio remains unchanged. Moreover, since the air permeability ratio remains unchanged, the water absorption and moisture retention performance of this moisture-conditioning sheet remains stable.

[0031] This humidity-regulating sheet is designed based on existing products, retaining a portion of the breathable and waterproof membrane 302 to ensure that the air permeability ratio of the semi-breathable layer 3 is the same as that of the breathable and waterproof membrane 302 in commercially available fiber humidity-regulating sheet products in the background technology, that is, the air permeability ratio of the semi-breathable layer 3 is still 20-30%. At the same time, the remaining part of the semi-breathable layer 3 adopts a second high-temperature heat-sealing film 301 with better sealing strength and lower cost, thereby significantly reducing the sealing cost while maintaining the overall water retention rate and water absorption rate of the humidity-regulating sheet.

[0032] In one embodiment, the first high-temperature heat-sealing film 101 and the adhesive 102 have the same area and the adhesive 102 is located directly below the first high-temperature heat-sealing film 101. The semi-permeable layer 3 and the encapsulation layer 1 have the same area. The moisture-absorbing layer 2 is located directly above the encapsulation layer 1 and the semi-permeable layer 3 is located directly above the moisture-absorbing layer 2.

[0033] In one embodiment, the semi-permeable layer 3 is formed by hot-pressing a second high-temperature resistant heat-sealing film 301 and a breathable waterproof film 302 together. An installation window is provided on the second high-temperature resistant heat-sealing film 301, and the breathable waterproof film 302 is hot-pressed together with the second high-temperature resistant heat-sealing film 301 at the installation window. Figure 1 and Figure 2 .

[0034] In one embodiment, the semi-permeable layer 3 is formed by hot-pressing two second high-temperature resistant heat-sealing films 301 and one breathable waterproof film 302 together. The width of one of the second high-temperature resistant heat-sealing films 301 in the front-back direction is equal to the length of the other second high-temperature resistant heat-sealing film 301 in the front-back direction. The length of the breathable waterproof film 302 in the front-back direction is equal to the width of one of the second high-temperature resistant heat-sealing films 301 in the front-back direction. The left edge of the breathable waterproof film 302 is hot-pressed together with the right edge of the left second high-temperature resistant heat-sealing film 301, and the right edge of the breathable waterproof film 302 is hot-pressed together with the left edge of the right second high-temperature resistant heat-sealing film 301. (See figure...) Figure 3 and Figure 4 .

[0035] In one embodiment, the semi-permeable layer 3 is formed by hot-pressing together a second high-temperature resistant heat-sealing film 301 and a breathable waterproof film 302. The length of the breathable waterproof film 302 in the front-to-back direction is equal to the width of the second high-temperature resistant heat-sealing film 301 in the front-to-back direction. Figure 5 In this embodiment, since the semi-permeable layer 3 is formed by hot-pressing together only a second high-temperature heat-sealing film 301 and a breathable waterproof film 302, the hot-pressing splicing process is simpler.

[0036] In one embodiment, the moisture-absorbing layer 2 is formed by a single piece of moisture-absorbing cotton 201; or, the moisture-absorbing layer 2 is formed by stacking multiple pieces of moisture-absorbing cotton 201 of equal area from bottom to top. The number of pieces of moisture-absorbing cotton 201 may be increased or decreased appropriately according to the required water absorption rate of the moisture-absorbing layer 2.

[0037] Preferably, the absorbent cotton 201 is polyester fiber absorbent cotton 201.

[0038] In one embodiment, the adhesive 102 is a double-sided adhesive. Specific Implementation

[0040] The moisture-absorbing layer 2 consists of a single piece of moisture-absorbing cotton 201 with a length of 55mm, a width of 30mm, and a thickness of 0.05-0.2mm. The moisture-absorbing layer 2, composed of moisture-absorbing cotton 201, is used for moisture absorption and control. The semi-permeable layer 3 has a length of 80mm, a width of 50mm, and a thickness of 0.05-0.2mm, and provides partial ventilation. The ventilation rate can be determined according to the area of ​​the breathable waterproof membrane 302 in the semi-permeable layer 3. The first high-temperature heat-sealing film 101 in the encapsulation layer 1 has a length of 80mm, a width of 50mm, and a thickness of 0.05-0.2mm. The first high-temperature heat-sealing film 101 makes this humidity-regulating sheet suitable for high-temperature environments. The adhesive 102 in the encapsulation layer 1 has a length of 80mm, a width of 50mm, and a thickness of 0.05-0.2mm and is used for mounting and fixing the humidity-regulating sheet.

[0041] This humidity regulating sheet can be used in the battery packs of new energy vehicles to regulate the humidity of the internal environment of the battery pack, prevent condensation, and provide reliable humidity protection for the safe operation of the battery in the battery pack.

[0042] In summary, this humidity regulating sheet significantly reduces packaging costs, meets market demands, and facilitates the large-scale application of humidity regulating sheets. Specifically, this humidity regulating sheet is suitable for widespread use in automotive battery packs of different price ranges, thereby further improving overall safety.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A humidity-controlling sheet, characterized by: The device includes an encapsulation layer (1), a moisture-absorbing layer (2), and a semi-permeable layer (3) arranged sequentially from bottom to top. The encapsulation layer (1) is composed of a first high-temperature heat-sealing film (101) and an adhesive (102), with the adhesive (102) disposed on the bottom surface of the first high-temperature heat-sealing film (101). The semi-permeable layer (3) is formed by hot-pressing a second high-temperature heat-sealing film (301) and a breathable and waterproof film (302). The area of ​​the moisture-absorbing layer (2) is smaller than the area of ​​the semi-permeable layer (3) and the first high-temperature heat-sealing film (101). The bottom edge of the semi-permeable layer (3) is connected to the top edge of the first high-temperature heat-sealing film (101) by hot-pressing to encapsulate the moisture-absorbing layer (2) between the semi-permeable layer (3) and the encapsulation layer (1). The adhesive (102) is used to fix the humidity-regulating sheet.

2. The humidity-controlling sheet according to claim 1, wherein: The first high-temperature heat-sealing film (101) and the adhesive (102) have the same area and the adhesive (102) is located directly below the first high-temperature heat-sealing film (101). The semi-permeable layer (3) and the encapsulation layer (1) have the same area. The moisture-absorbing layer (2) is located directly above the encapsulation layer (1). The semi-permeable layer (3) is located directly above the moisture-absorbing layer (2).

3. The humidity-controlling sheet according to claim 1, wherein: The semi-permeable layer (3) is formed by hot pressing together a second high-temperature heat-sealing film (301) and a breathable waterproof film (302). An installation window is provided on the second high-temperature heat-sealing film (301), and the breathable waterproof film (302) is hot-pressed together with the second high-temperature heat-sealing film (301) at the installation window.

4. The humidity-controlling sheet according to claim 1, wherein: The semi-permeable layer (3) is formed by hot-pressing two pieces of second high-temperature heat-sealing film (301) and one piece of breathable waterproof film (302). The width of one piece of second high-temperature heat-sealing film (301) in the front-back direction is equal to the length of the other piece of second high-temperature heat-sealing film (301) in the front-back direction. The length of the breathable waterproof film (302) in the front-back direction is equal to the width of one piece of second high-temperature heat-sealing film (301) in the front-back direction. The left edge of the breathable waterproof film (302) is hot-pressed and spliced ​​with the right edge of the left second high-temperature heat-sealing film (301). The right edge of the breathable waterproof film (302) is hot-pressed and spliced ​​with the left edge of the right second high-temperature heat-sealing film (301).

5. The humidity-controlling sheet according to claim 1, wherein: The semi-permeable layer (3) is formed by hot pressing together a second high-temperature heat-sealing film (301) and a breathable waterproof film (302). The length of the breathable waterproof film (302) in the front-to-back direction is equal to the width of the second high-temperature heat-sealing film (301) in the front-to-back direction.

6. The humidity-controlling sheet according to claim 1, wherein: The absorbent layer (2) is formed by a single piece of absorbent cotton (201); or, the absorbent layer (2) is formed by stacking multiple pieces of absorbent cotton (201) of equal area from bottom to top.

7. A humidity regulating sheet according to claim 6, characterized in that: The absorbent cotton (201) is polyester fiber absorbent cotton (201).

8. The humidity-controlling sheet according to claim 1, wherein: The breathable and waterproof membrane (302) is a PTFE membrane.

9. The humidity-controlling sheet according to claim 1, wherein: Both the first high-temperature heat-sealing film (101) and the second high-temperature heat-sealing film (301) are PET films.

10. The humidity-controlling sheet according to claim 1, wherein: The adhesive (102) is a double-sided adhesive.

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