Packaging bag, electrochemical device, and electronic device

Abstract

The utility model discloses a kind of packaging bag, electrochemical device and electronic equipment, packaging bag includes: laminated heat-seal layer, metal layer and outer layer;The heat-seal layer is provided with groove, the opening of the groove is towards the heat-seal layer side opposite to the metal layer, the bonding force between the bottom wall of the groove and the metal layer is A, A is 3N / 15mm at least.The packaging bag of the utility model can effectively avoid heat-seal layer and metal layer fall off.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical energy storage technology, and in particular to a packaging bag, an electrochemical device, and an electronic device. Background Technology

[0002] In related technologies, the electrochemical device includes an aluminum-plastic film and a battery cell. After the aluminum-plastic film is perforated, the battery cell can be placed into the perforation of the aluminum-plastic film. After the aluminum-plastic film is sealed, the battery cell is encapsulated. The aluminum-plastic film includes a heat-sealing layer, a metal layer, and an outer layer. The outer layer mainly serves to resist external friction, compression, or puncture by sharp objects, protecting the internal structure from damage. The metal layer mainly serves to isolate gases such as oxygen, water vapor, and carbon dioxide, and the metal layer can be made of aluminum. The heat-sealing layer mainly serves to heat-seal the battery, and the heat-sealing layer can be made of PP (polypropylene).

[0003] Furthermore, during the manufacturing of the aluminum-plastic film, the metal layer is bonded to the heat-sealing layer and the outer layer on both sides, respectively. To accommodate more battery cells, existing aluminum-plastic films typically have a groove laser-cut into the heat-sealing layer, increasing the film's volume to hold more cells. However, laser heating weakens the adhesion between the heat-sealing layer and the metal layer at the groove, potentially causing them to detach. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a packaging bag that can effectively prevent the heat-sealing layer and metal layer from peeling off.

[0005] This invention also proposes an electrochemical device.

[0006] This utility model also proposes an electronic device.

[0007] According to a first aspect of the present invention, a packaging bag includes: a heat-sealing layer, a metal layer, and an outer layer stacked together; the heat-sealing layer is provided with a groove, the opening of the groove facing the side of the heat-sealing layer opposite to the metal layer, and the adhesive force between the bottom wall of the groove and the metal layer is A, where A≥3N / 15mm.

[0008] The packaging bag according to the embodiments of this utility model has at least the following beneficial effects: the heat-sealing layer is provided with a groove, which can be used to increase the capacity of the packaging bag. The adhesive force between the bottom wall of the groove and the metal layer is A, where A ≥ 3 N / 15 mm. Thus, the adhesive force between the heat-sealing layer and the metal layer at the groove location is relatively large, which can effectively prevent the heat-sealing layer and the metal layer from detaching.

[0009] According to some embodiments of the present invention, the heat-sealing layer of the packaging bag includes a thinning area and a normal area. The thinning area is provided with the groove. The length of the thinning area is L1, and the length of the normal area is L2, where L1 / L2 = 0.85~0.95.

[0010] According to some embodiments of the present invention, the adhesive force between the normal area and the metal layer of the packaging bag is B, where 3N / 15mm≤B≤15N / 15mm.

[0011] According to some embodiments of the present invention, the thickness of the thinned area is H1, the thickness of the normal area is H2, and H1 / H2 = 0.33~0.65.

[0012] According to some embodiments of the present invention, the packaging bag has 3N / 15mm ≤ A ≤ 15N / 15mm.

[0013] An electrochemical device according to a second aspect of the present invention includes a packaging bag as described in any one of the first aspects of the present invention.

[0014] The electrochemical device according to the embodiments of this utility model has at least the following beneficial effects: the heat-sealing layer is provided with a groove, which can be used to increase the capacity of the packaging bag. The adhesion force between the bottom wall of the groove and the metal layer is A, where A ≥ 3 N / 15 mm. Thus, the adhesion force between the heat-sealing layer and the metal layer at the groove location is relatively large, which can effectively prevent the heat-sealing layer and the metal layer from detaching. Furthermore, the electrochemical device with this packaging bag has high safety.

[0015] According to some embodiments of the present invention, the electrochemical device further includes a battery cell, the packaging bag is provided with a storage cavity, and the battery cell is disposed in the storage cavity.

[0016] According to some embodiments of the present invention, the electrochemical device of the storage chamber includes a first wall and a second wall, the second wall surrounding the edge connected to the first wall, and the first wall having the groove.

[0017] According to some embodiments of the present invention, in an electrochemical device, the first wall is located on one side in the thickness direction of the battery cell.

[0018] An electronic device according to a third aspect of the present invention includes the electrochemical device described in any one of the second aspects of the present invention.

[0019] The electronic device according to the embodiments of this utility model has at least the following beneficial effects: The heat-sealing layer is provided with a groove, which can be used to increase the capacity of the packaging bag. The adhesion force between the bottom wall of the groove and the metal layer is A, where A ≥ 3 N / 15 mm. Thus, the adhesion force between the heat-sealing layer and the metal layer at the groove location is relatively large, which can effectively prevent the heat-sealing layer and the metal layer from detaching. Furthermore, the electrochemical device with this packaging bag has high safety. Even further, the electronic device with this electrochemical device has high safety.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The embodiments in this application are not limited to the drawings described below, which are only examples of those used in this application. Some embodiments. Those skilled in the art can obtain drawings of other embodiments based on the content of this application. The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the packaging bag according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the packaging bag according to the second embodiment of the present invention.

[0022] Figure label: Packaging bag 100, heat seal layer 200, metal layer 300, outer layer 400, groove 500, normal area 600, thinning area 700, first wall 800, second wall 900. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. 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.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] This application provides an electrochemical device, including any device in which an electrochemical reaction occurs to interconvert chemical energy and electrical energy. Specific, non-limiting examples include all types of primary electrochemical devices, secondary electrochemical devices, fuel electrochemical devices, solar electrochemical devices, or capacitors. In particular, the electrochemical device is a lithium secondary electrochemical device, including lithium metal secondary electrochemical devices, lithium-ion secondary electrochemical devices, lithium polymer secondary electrochemical devices, or lithium-ion polymer secondary electrochemical devices.

[0029] In some embodiments, the electrochemical device includes a positive electrode, a negative electrode, and a membrane, with the membrane located between the positive and negative electrodes. Between the electrodes, and the diaphragm used in the electrochemical device is the diaphragm described above in this application.

[0030] In some embodiments, the positive electrode may include a positive electrode current collector and a positive electrode active material layer disposed on at least one side of the positive electrode current collector.

[0031] In some embodiments, the positive current collector is a metal foil or a composite current collector. In some embodiments, the metal foil is an aluminum foil. The composite current collector may include a metal foil substrate and a conductive layer disposed on at least one side of the metal foil substrate.

[0032] In some embodiments, the electrochemical device has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0033] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0034] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0035] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0036] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0037] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by winding.

[0038] In some embodiments, the electrochemical device may be cylindrical, flat, or polygonal in shape.

[0039] In some embodiments, the electrochemical device is provided with tabs that allow current to be drawn out of the device. The tabs include a positive tab and a negative tab.

[0040] In some embodiments, the electrochemical device may include a housing. The housing is used to encapsulate the electrochemical device and components such as the electrolyte. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0041] As an example, the electrochemical device can be a cylindrical electrochemical device, a prismatic electrochemical device, a soft-pack electrochemical device, or an electrochemical device of other shapes. Prismatic electrochemical devices include, but are not limited to, square-shell electrochemical devices, blade-shaped electrochemical devices, and multi-prismatic electrochemical devices, such as hexagonal prismatic electrochemical devices.

[0042] This application provides an electronic device that includes the electrochemical device described above.

[0043] The electronic device described in this application is not particularly limited and may be any electronic device known in the prior art.

[0044] The application of the electrochemical device of the present invention is not particularly limited, and it can be used in any electronic device known in the prior art.

[0045] According to some embodiments of the present invention, electronic devices include, but are not limited to, mobile phones, smartphones, laptops, tablets, wearable devices, smartwatches, smart bracelets, smart glasses, power banks, televisions, game consoles, game controllers, digital cameras, smart speakers, headphones, keyboards, mice, monitors, drones, audio equipment, home appliances, toys, power tools, automobiles, motorcycles, electric bicycles, bicycles, robots, robot dogs, industrial robots, and android robots.

[0046] In related technologies, the electrochemical device includes an aluminum-plastic film and a battery cell. After the aluminum-plastic film is perforated, the battery cell can be placed into the perforations in the film. After the aluminum-plastic film is sealed, the battery cell is encapsulated. The aluminum-plastic film includes a heat-sealing layer 200, a metal layer 300, and an outer layer 400. The outer layer 400 mainly serves to resist external friction, compression, or puncture by sharp objects, protecting the internal structure from damage. The metal layer 300 mainly serves to isolate gases such as oxygen, water vapor, and carbon dioxide. The metal layer 300 can be made of aluminum. The heat-sealing layer 200 mainly performs the heat-sealing function. The heat-sealing layer 200 can be made of PP.

[0047] Furthermore, during the fabrication of the aluminum-plastic film, the metal layer 300 is bonded to the heat-sealing layer 200 and the outer layer 400 on both sides, respectively. To accommodate more battery cells, existing aluminum-plastic films typically use laser technology to create a groove 500 on the heat-sealing layer 200, thereby increasing the film's volume to accommodate more cells. However, laser heating weakens the adhesion between the heat-sealing layer 200 and the metal layer 300 at the groove 500, potentially causing them to detach. Therefore, this application proposes a packaging bag 100.

[0048] Please refer to Figure 1In some embodiments, the packaging bag 100 includes: a heat-sealing layer 200, a metal layer 300, and an outer layer 400 stacked together. The heat-sealing layer 200 can be a PP layer, a PE layer, or a CPP layer. The metal layer 300 can be an aluminum layer. The outer layer 400 can be a nylon layer. The heat-sealing layer 200 is provided with a groove 500, the opening of which faces the side of the heat-sealing layer 200 opposite to the metal layer 300. The shape of the groove 500 can be consistent with the shape of the battery cell, which facilitates the placement of the battery cell. Alternatively, the battery cell may have a layer of hot melt adhesive, and the shape of the groove 500 can be consistent with the shape of the hot melt adhesive, which facilitates the placement of the hot melt adhesive. The adhesive force between the bottom wall of the groove 500 and the metal layer 300 is A, where A ≥ 3 N / 15 mm. Specifically, the heat-sealing layer 200 is provided with a groove 500, which can be used to increase the capacity of the packaging bag 100. The adhesion between the bottom wall of the groove 500 and the metal layer 300 is A, where A≥3N / 15mm. Thus, the adhesion between the heat-sealing layer 200 and the metal layer 300 at the groove 500 is relatively large, which can effectively prevent the heat-sealing layer 200 and the metal layer 300 from falling off.

[0049] To further clarify, the adhesive force between the bottom wall of the groove 500 and the metal layer 300 can be 3N / 15mm, 4N / 15mm, 5N / 15mm, 6N / 15mm, 7N / 15mm, 8N / 15mm, 9N / 15mm, 10N / 15mm, 11N / 15mm, 12N / 15mm, 13N / 15mm, 14N / 15mm, 15N / 15mm, 16N / 15mm, 17N / 15mm, 18N / 15mm, 19N / 15mm, 20N / 15mm, etc., or fall within the range of any two of the above values. "N / 15mm" indicates that during the peeling process between the metal layer 300 and the heat-sealing layer 200, the tensile force corresponding to every 15mm elongation is 1 Newton. Specifically, the testing process for the packaging bag 100 can be to peel off the heat-sealing layer 200 and the metal layer 300 by a certain length as the starting point, and then peel them off at a certain angle (90° or 180°) and speed, and then measure the force required to peel off the heat-sealing layer 200 and the metal layer 300.

[0050] Furthermore, the manufacturing process of the heat-sealed bag can involve preparing a heat-sealing layer 200, a metal layer 300, and an outer layer 400, and then bonding both sides of the metal layer 300 to the heat-sealing layer 200 and the outer layer 400 respectively using an adhesive. The bonding process can utilize polyurethane adhesive, acrylic adhesive, or acrylate adhesive. After bonding is complete, grooves 500 are created on the heat-sealing layer 200 using a laser.

[0051] Please refer to the table below for further information.

[0052]

[0053] In the table above, the test procedure for the adhesive strength between the heat-sealing layer 200 and the metal layer 300 can be as follows: peel off a certain length of the heat-sealing layer 200 and the metal layer 300 as the starting point, and then peel at a certain angle (90° or 180°) and speed. The force required to peel the heat-sealing layer 200 and the metal layer 300 is then measured. Thus, when the adhesive strength between the heat-sealing layer 200 and the metal layer 300 is greater than 3N / 15mm, the heat-sealing layer 200 and the metal layer 300 will not detach from each other.

[0054] Further, please refer to Figure 1 In some embodiments, the heat-sealing layer 200 includes a thinned area 700 and a normal area 600, with the thinned area 700 having a groove 500. Specifically, the normal area 600 refers to the unprocessed area on the heat-sealing layer 200, and the thinned area 700 refers to the area on the heat-sealing layer 200 where the groove 500 is provided. The thickness of the normal area 600 remains constant, while the depth of the groove 500 can be set according to the situation. For example, the depth of the groove 500 can be 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, or 30μm, or within a range of any two of the above values. In some cases, through holes can be provided on the heat-sealing layer 200, so that the heat-sealing layer 200 and the metal layer 300 together form a groove 500, the bottom wall of which is the metal layer 300, and there is no heat-sealing layer 200. The length of the thinned region 700 is L1, and the length of the normal region 600 is L2, where L1 / L2 = 0.85~0.95. L1 / L2 can be equal to 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, or 0.95, or fall within the range of any two of the above values.

[0055] Furthermore, in some embodiments, the adhesive force between the normal area 600 and the metal layer 300 is B, where 3N / 15mm ≤ B ≤ 15N / 15mm. Specifically, the adhesive force between the normal area 600 and the metal layer 300 can be 3N / 15mm, 4N / 15mm, 5N / 15mm, 6N / 15mm, 7N / 15mm, 8N / 15mm, 9N / 15mm, 10N / 15mm, 11N / 15mm, 12N / 15mm, 13N / 15mm, 14N / 15mm, 15N / 15mm, or within any two of the above values. If the adhesive force between the normal area 600 and the metal layer 300 is too small, it may result in poor adhesion between the normal area 600 and the metal layer 300, making them prone to peeling. If the adhesion between the normal zone 600 and the metal layer 300 is too strong, it will result in a higher cost of adhesive, which in turn will lead to a higher manufacturing cost of the packaging bag 100.

[0056] Furthermore, to effectively prevent the heat-sealing layer 200 and the metal layer 300 from detaching from the groove 500 after the heat-sealing layer 200 is formed, a high-performance adhesive can be used before bonding the heat-sealing layer 200 and the metal layer 300, thereby improving the adhesion between them. The normal area 600, being unaffected by laser heating, exhibits greater adhesion; therefore, the adhesion strength in the normal area 600 is greater than that in the thinned area 700.

[0057] Furthermore, in some embodiments, the thickness of the thinned region 700 is H1, and the thickness of the normal region 600 is H2, with H1 / H2 = 0.33~0.65. H1 / H2 can be equal to 0.33, 0.34, 0.35, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.5, 0.55, 0.6, 0.61, 0.62, 0.63, 0.64, or 0.65, or fall within the range of any two of the above values.

[0058] Furthermore, in some embodiments, 3N / 15mm ≤ A ≤ 15N / 15mm. Specifically, A can be 3N / 15mm, 4N / 15mm, 5N / 15mm, 6N / 15mm, 7N / 15mm, 8N / 15mm, 9N / 15mm, 10N / 15mm, 11N / 15mm, 12N / 15mm, 13N / 15mm, 14N / 15mm, 15N / 15mm, or within any two of the above values. When the adhesive force between the bottom wall of the groove 500 and the metal layer 300 is low, this can cause the heat-sealing layer 200 and the metal layer 300 to easily detach. When the adhesive force between the bottom wall of the groove 500 and the metal layer 300 is high, it increases the manufacturing cost of the packaging bag 100.

[0059] In some embodiments, the electrochemical device includes the encapsulation bag 100 of any of the above embodiments. Specifically, the heat-sealing layer 200 is provided with a groove 500, which can be used to increase the capacity of the encapsulation bag 100. The adhesive force between the bottom wall of the groove 500 and the metal layer 300 is A, where A ≥ 3 N / 15 mm. Thus, the adhesive force between the heat-sealing layer 200 and the metal layer 300 at the groove 500 is relatively large, which can effectively prevent the heat-sealing layer 200 and the metal layer 300 from detaching. Furthermore, the electrochemical device with this encapsulation bag 100 has higher safety.

[0060] Furthermore, in some embodiments, the electrochemical device also includes a battery cell, and the encapsulation bag 100 is provided with a storage cavity in which the battery cell is disposed. After the battery cell is disposed in the storage cavity, a portion of the battery cell may be located in a recess 500. Compared to a configuration without a recess 500, the configuration of the recess 500 can increase the energy density of the electrochemical device.

[0061] Further, please refer to Figure 2 In some embodiments, the cavity wall of the storage cavity includes a first wall 800 and a second wall 900, the second wall 900 surrounding the edge connected to the first wall 800, and the first wall 800 being provided with a groove 500. Specifically, there are two first walls 800, each connected to one end of the second wall 900. The second wall 900 may be annular in shape.

[0062] Furthermore, in some embodiments, the first wall 800 is located on one side in the cell thickness direction. Specifically, after the first wall 800 is located on one side in the cell thickness direction, the groove 500 can accommodate a portion of the cell, thereby increasing the energy density of the electrochemical device.

[0063] In some embodiments, the electronic device includes the electrochemical device of any of the above embodiments. Specifically, the heat-sealing layer 200 is provided with a groove 500, which can be used to increase the capacity of the packaging bag 100. The adhesive force between the bottom wall of the groove 500 and the metal layer 300 is A, where A ≥ 3 N / 15 mm. Thus, the adhesive force between the heat-sealing layer 200 and the metal layer 300 at the groove 500 is relatively large, which can effectively prevent the heat-sealing layer 200 and the metal layer 300 from detaching. Furthermore, the electrochemical device with this packaging bag 100 has higher safety. Even further, the electronic device with this electrochemical device has higher safety.

[0064] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Furthermore, the embodiments and features of this utility model can be combined with each other unless otherwise specified.

Claims

1. A packaging bag, characterized in that, include: A heat-sealing layer, a metal layer, and an outer layer are stacked together; the heat-sealing layer is provided with a groove, the opening of the groove faces the side of the heat-sealing layer opposite to the metal layer, and the adhesion force between the bottom wall of the groove and the metal layer is A, where A≥3N / 15mm.

2. The packaging bag according to claim 1, characterized in that, The heat-sealing layer includes a thinning zone and a normal zone. The thinning zone is provided with the groove. The length of the thinning zone is L1, and the length of the normal zone is L2, where L1 / L2 = 0.85~0.

95.

3. The packaging bag according to claim 2, characterized in that, The adhesion force between the normal area and the metal layer is B, where 3N / 15mm ≤ B ≤ 15N / 15mm.

4. The packaging bag according to claim 2, characterized in that, The thickness of the thinned area is H1, and the thickness of the normal area is H2, where H1 / H2 = 0.33~0.

65.

5. The packaging bag according to claim 1, characterized in that, 3N / 15mm≤A≤15N / 15mm.

6. An electrochemical device, characterized in that, Includes the packaging bag as described in any one of claims 1 to 5.

7. The electrochemical device according to claim 6, characterized in that, The electrochemical device also includes a battery cell, and the packaging bag is provided with a storage cavity, in which the battery cell is disposed.

8. The electrochemical device according to claim 7, characterized in that, The storage cavity wall includes a first wall and a second wall, the second wall surrounding the edge connected to the first wall, and the first wall having the groove.

9. The electrochemical device according to claim 8, characterized in that, The first wall is located on one side in the thickness direction of the battery cell.

10. An electronic device, characterized in that, Includes the electrochemical device as described in any one of claims 6 to 9.

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