Battery and electronic equipment

Abstract

The utility model discloses a battery and electronic equipment, and the battery comprises a first battery cell which is provided with a first tab; the second battery cell is provided with a second tab; the packaging structure comprises a partition plate which comprises a first surface and a second surface which are oppositely arranged; the first packaging film comprises a first main body part, a first edge sealing part, two second edge sealing parts and a third edge sealing part; the first edge sealing part is arranged on one side deviating from the first tab, and the first edge sealing part is positioned between the first surface and the first main body part in the thickness direction of the partition plate; the second packaging film comprises a second main body part, a fourth edge sealing part, two fifth edge sealing parts and a sixth edge sealing part; the fourth edge sealing part is arranged on one side deviating from the second tab, and the fourth edge sealing part is positioned between the second surface and the second main body part in the thickness direction of the partition plate. The battery provided by the utility model can have relatively high energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and electronic equipment. Background Art

[0002] In the related technology, the internal series battery uses the principle of series voltage division to reduce the current entering the battery under the same charging power, thereby greatly reducing the heat generated during the charging process, thereby effectively improving the charging speed of the mobile phone.

[0003] In a soft-pack battery, when there are two battery cells in the packaging film, a partition is used between the two battery cells to separate them so that the two battery cells can work independently. The partition and the packaging film realize the packaging of the battery cells. The existing packaging film is connected to the partition in the following way: one packaging film is packaged on one side of the partition to form a receiving cavity for placing the battery cell, and the other packaging film is packaged on the other side of the partition to form a receiving cavity for placing the battery cell. In this way, the soft-pack battery has two battery cells. Furthermore, when the packaging film is packaged on the partition, the packaging film and the partition will form a bottom seal, a side seal and a top seal, and the bottom seal will result in a lower energy density of the battery. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery that can have a higher energy density.

[0005] The utility model also provides an electronic device.

[0006] A battery according to a first embodiment of the present invention includes:

[0007] A first battery cell having a first tab;

[0008] The second battery cell has a second electrode tab;

[0009] A packaging structure, the packaging structure comprising:

[0010] The partition includes a first surface and a second surface that are arranged opposite to each other;

[0011] A first packaging film, comprising a first main body and a first edge sealing portion, wherein the first edge sealing portion is connected to the first surface, the first main body and the first surface jointly define a first accommodation cavity, and the first battery cell is arranged in the first accommodation cavity; the first edge sealing portion is arranged on a side away from the first electrode tab, and in the thickness direction of the partition, the first edge sealing portion is located between the first surface and the first main body;

[0012] The second packaging film includes a second main body and a fourth edge sealing portion, wherein the fourth edge sealing portion is connected to the second surface, and the second main body and the second surface jointly define a second accommodating cavity, wherein the second battery cell is arranged in the second accommodating cavity; the fourth edge sealing portion is arranged on a side away from the second pole ear, and in the thickness direction of the partition, the fourth edge sealing portion is located between the second surface and the second main body.

[0013] The battery according to the embodiment of the utility model has at least the following beneficial effects: the first packaging film is located on the first side of the partition, the second packaging film is located on the second side of the partition, the first main body and the first side of the partition form a first accommodating cavity, the first battery cell is arranged in the first accommodating cavity, the second main body and the second side of the partition form a second accommodating cavity, and the second battery cell is arranged in the second accommodating cavity. In the prior art, the projection of the first edge sealing portion does not overlap with the projection of the first main body in the thickness direction of the partition, and the projection of the second edge sealing portion does not overlap with the projection of the second main body in the thickness direction of the partition, which will increase the length of the battery and result in a lower energy density of the battery. In the present application, along the thickness direction of the partition, the first edge sealing portion is located between the first main body and the first side, and along the thickness direction of the partition, the fourth edge sealing portion is located between the second main body and the second side. Therefore, the battery of the present application can have a higher energy density.

[0014] According to some embodiments of the battery of the present invention, the thickness of the first edge sealing portion is H1, the width of the first edge sealing portion is D1, the packaging coefficient of the first packaging film is λ1, the expansion coefficient of the first packaging film is k1, λ1=a(D1 / H1), 0.5≤(H1 / (λ1(k1+5)))*10000≤4.5.

[0015] According to some embodiments of the present invention, for batteries, 15 mm ≤ λ1 ≤ 55 mm, 4.05 ≤ k1 ≤ 9.51, and 0.8 ≤ a ≤ 1.2.

[0016] According to some embodiments of the battery of the present invention, the thickness of the fourth edge sealing portion is H2, the width of the fourth edge sealing portion is D2, the packaging coefficient of the second packaging film is λ2, the expansion coefficient of the second packaging film is k2, λ2=a(D2 / H2), 0.5≤(H2 / (λ2(k2+5)))*10000≤4.5.

[0017] According to some embodiments of the present invention, for batteries, 15 mm ≤ λ2 ≤ 55 mm, 4.05 ≤ k2 ≤ 9.51, and 0.8 ≤ a ≤ 1.2.

[0018] In the battery according to some embodiments of the present invention, the first edge sealing portion is entirely attached to the separator; and / or the fourth edge sealing portion is entirely attached to the separator.

[0019] According to some embodiments of the battery of the present invention, a first chamfer is provided at a corner of the first accommodating cavity away from the partition, and the radius of the first chamfer is 0.5mm to 2mm; and / or a second chamfer is provided at a corner of the second accommodating cavity away from the partition, and the radius of the second chamfer is 0.5mm to 2mm.

[0020] In the battery according to some embodiments of the present invention, the width of the first edge sealing portion is D1, and 1 mm ≤ D1 ≤ 3.8 mm.

[0021] In the battery according to some embodiments of the present invention, the width of the fourth edge sealing portion is D2, and 1mm≤D2≤3.8mm.

[0022] The electronic device according to the second aspect of the present invention comprises the battery described in any one of the first aspect.

[0023] The electronic device according to the embodiment of the utility model has at least the following beneficial effects: the first packaging film is located on the first surface of the partition, the second packaging film is located on the second surface of the partition, the first main body and the first surface of the partition form a first accommodating cavity, the first battery cell is arranged in the first accommodating cavity, the second main body and the second surface of the partition form a second accommodating cavity, and the second battery cell is arranged in the second accommodating cavity. In the prior art, the projection of the first edge sealing portion does not overlap with the projection of the first main body in the thickness direction of the partition, and the projection of the second edge sealing portion does not overlap with the projection of the second main body in the thickness direction of the partition, which will increase the extra length of the battery and lead to a lower energy density of the battery. In the present application, along the thickness direction of the partition, the first edge sealing portion is located between the first main body and the first surface, and along the thickness direction of the partition, the fourth edge sealing portion is located between the second main body and the second surface. Therefore, the battery of the present application can have a higher energy density. Further, the electronic device with the battery has a better endurance.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 Schematic diagram of batteries according to some embodiments of the present invention;

[0027] Figure 2 Schematic diagram of a first packaging film in a battery in some embodiments of the utility model;

[0028] Figure 3Schematic diagram of the second packaging film in the battery of some embodiments of the present utility model.

[0029] Reference numerals:

[0030] Battery 10, first battery cell 100, first pole ear 110, second battery cell 200, second pole ear 210, partition 300, first surface 310, second surface 320, first packaging film 400, first main body 410, first edge sealing portion 420, second edge sealing portion 430, third edge sealing portion 440, first accommodating cavity 500, second packaging film 600, second main body 610, fourth edge sealing portion 620, fifth edge sealing portion 630, sixth edge sealing portion 640, second accommodating cavity 700. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 the present invention.

[0033] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Please refer to Figures 1 to 3In some embodiments, the battery 10 includes: a first battery cell 100, a second battery cell 200 and a packaging structure. The first battery cell 100 has a first pole ear 110. The first battery cell 100 is electrically connected to the outside world through the first pole ear 110, wherein the first pole ear 110 may be provided with two, one is a positive pole ear, and the other is a negative pole ear, so that the positive and negative electrodes of the first battery cell 100 are connected to the outside world. The first battery cell 100 can be formed by winding or lamination. The second battery cell 200 has a second pole ear 210. The second battery cell 200 is electrically connected to the outside world through the second pole ear 210, wherein the second pole ear 210 may be provided with two, one is a positive pole ear, and the other is a negative pole ear, so that the positive and negative electrodes of the second battery cell 200 are connected to the outside world. The packaging structure includes: a partition 300, a first packaging film 400 and a second packaging film 600. The partition 300 includes a first surface 310 and a second surface 320 arranged opposite to each other, and the shape of the partition 300 may be rectangular. The partition 300 can separate the first battery cell 100 from the second battery cell 200, effectively avoiding the problem of short circuit. The first packaging film 400 includes a first main body 410, a first edge sealing portion 420, two second edge sealing portions 430 and a third edge sealing portion 440. The first packaging film 400 can be an aluminum-plastic film. The aluminum-plastic film is heat-sealed on the partition 300 by a heat sealing process to form a first edge sealing portion 420, two second edge sealing portions 430 and a third edge sealing portion 440. The thickness of the first packaging film 400 can be 50um to 115um. Among them, the first edge sealing portion 420, the two second edge sealing portions 430 and the third edge sealing portion 440 are all surrounded by the periphery of the first main body 410 and connected to the first main body 410. The first edge sealing portion 420, the two second edge sealing portions 430 and the third edge sealing portion 440 are all connected to the first surface 310, and the first main body portion 410 and the first surface 310 jointly define a first accommodating cavity 500, and the first battery cell 100 is disposed in the first accommodating cavity 500. The first edge sealing portion 420 is disposed on the side away from the first pole tab 110, and along the thickness direction of the partition 300, the first edge sealing portion 420 is located between the first main body portion 410 and the first surface 310. The second packaging film 600 includes a second main body portion 610, a fourth edge sealing portion 620, two fifth edge sealing portions 630 and a sixth edge sealing portion 640, and the second packaging film 600 may be an aluminum-plastic film. The aluminum-plastic film is heat-sealed on the partition 300 by a heat-sealing process to form the fourth edge sealing portion 620, the two fifth edge sealing portions 630 and the sixth edge sealing portion 640.The fourth edge sealing portion 620, the two fifth edge sealing portions 630 and the sixth edge sealing portion 640 are together surrounding the periphery of the second main body portion 610 and are connected to the second main body portion 610; the fourth edge sealing portion 620, the two fifth edge sealing portions 630 and the sixth edge sealing portion 640 are all connected to the second surface 320, the second main body portion 610 and the second surface 320 jointly define a second accommodating cavity 700, and the second battery cell 200 is arranged in the second accommodating cavity 700; the fourth edge sealing portion 620 is arranged on the side away from the second pole ear 210, and along the thickness direction of the partition 300, the fourth edge sealing portion 620 is located between the second main body portion 610 and the second surface 320. Specifically, the first packaging film 400 is located on the first surface 310 of the partition 300, the second packaging film 600 is located on the second surface 320 of the partition 300, the first main body 410 and the first surface 310 of the partition 300 form a first accommodating cavity 500, the first battery cell 100 is arranged in the first accommodating cavity 500, the second main body 610 and the second surface 320 of the partition 300 form a second accommodating cavity 700, and the second battery cell 200 is arranged in the second accommodating cavity 700. In the prior art, the projection of the first edge sealing portion 420 in the thickness direction of the partition 300 is parallel to the first main body The projection of the second edge sealing portion 430 does not overlap with the projection of the second main body portion 610 in the thickness direction of the partition 300, which will increase the extra length of the battery 10, resulting in a lower energy density of the battery 10. In the present application, along the thickness direction of the partition 300, the first edge sealing portion 420 is located between the first main body portion 410 and the first surface 310, and along the thickness direction of the partition 300, the fourth edge sealing portion 620 is located between the second main body portion 610 and the second surface 320. Therefore, the battery 10 of the present application can have a higher energy density.

[0037] The following is a detailed description of the process of connecting the first packaging film 400, the second packaging film 600 and the partition 300. First, the first packaging film 400 is punched out to form a first main body 410, a first edge seal 420, two second edge seals 430 and a third edge seal 440, wherein the first main body 410 can protrude from the first edge seal 420, the two second edge seals 430 and the third edge seal 440 to form a groove. Afterwards, the first edge seal 420 is folded so that the first edge seal 420 and the first main body 410 overlap, and then the first edge seal 420 is heat-sealed on the first surface 310 of the partition 300 by a heat sealer. Afterwards, the first battery cell 100 is placed in the first accommodating cavity 500, and then the two second edge seals 430 and the third edge seal 440 are heat-sealed. In this way, the connection between the first packaging film 400 and the partition 300 is completed. Next, the second packaging film 600 is punched out into a second main body 610, a fourth edge seal 620, two fifth edge seals 630 and a sixth edge seal 640, wherein the second main body 610 can protrude from the fourth edge seal 620, the two fifth edge seals 630 and the sixth edge seal 640 to form a groove. Afterwards, the fourth edge seal 620 is folded so that the fourth edge seal 620 overlaps with the second main body 610, and then the fourth edge seal 620 is heat-sealed on the second surface 320 of the partition 300 by a heat sealer. Afterwards, the second battery cell 200 is placed in the second accommodating cavity 700, and then the two fifth edge seals 630 and the sixth edge seal 640 are heat-sealed. In this way, the connection between the second packaging film 600 and the partition 300 is completed.

[0038] For further information, please refer to Figure 1 In some embodiments, the first edge seal 420 is entirely attached to the partition 300; and / or the fourth edge seal 620 is entirely attached to the partition 300. Specifically, the first edge seal 420 is entirely attached to the partition 300, which means that the first edge seal 420 is parallel to the partition 300, that is, the first edge seal 420 will not be lifted up on the partition 300. Specifically, when the first edge seal 420 is lifted up, the first edge seal 420 will occupy the space of the first accommodating cavity 500, resulting in a smaller volume of the first battery cell 100 placed therein, thereby making the energy density of the battery 10 lower. Similarly, the fourth edge seal 620 is entirely attached to the partition 300, which means that the fourth edge seal 620 is parallel to the partition 300, that is, the fourth edge seal 620 will not be lifted up on the partition 300. When the fourth edge sealing portion 620 is tilted, the fourth edge sealing portion 620 will occupy the space of the second receiving cavity 700 , resulting in a smaller volume of the second battery cell 200 placed therein, thereby lowering the energy density of the battery 10 .

[0039] Further, in some embodiments, a first chamfer is provided at a corner of the first accommodating cavity 500 away from the partition 300, and the radius of the first chamfer is 0.5 mm to 2 mm; and / or, a second chamfer is provided at a corner of the second accommodating cavity 700 away from the partition 300, and the radius of the second chamfer is 0.5 mm to 2 mm. Specifically, during the long-term charging and discharging cycle of the battery 10, the sharp edges and corners in the first packaging film 400 will cause tiny scratches on the surface of the first battery cell 100, and gradually expand under repeated physical effects, eventually causing damage to the first battery cell 100. Therefore, after the first chamfer is provided on the first packaging film 400, the sharp edges and corners can be prevented from scratching the surface of the first battery cell 100, thereby protecting the first battery cell 100 and extending the service life. Similarly, the sharp edges in the second packaging film 600 may cause tiny scratches on the surface of the second battery cell 200, which will gradually expand under repeated physical effects and eventually damage the second battery cell 200. Therefore, after setting a second chamfer on the second packaging film 600, the sharp edges can be prevented from scratching the surface of the second battery cell 200, thereby protecting the second battery cell 200 and extending its service life.

[0040] Please refer to Figure 2In some embodiments, the thickness of the first edge sealing portion 420 is H1, the width of the first edge sealing portion 420 is D1, the packaging coefficient of the first packaging film 400 is λ1, the expansion coefficient of the first packaging film 400 is k1, λ1=a(D1 / H1), 0.5≤(H1 / (λ1(k1+5)))*10000≤4.5. For example, D1=15mm, H1=0.065mm, then λ1=23mm. Specifically, the shape of the first edge sealing portion 420 can be a rectangle, and the width of the first edge sealing portion 420 determines whether the sealing of the battery 10 is good. If the width of the first edge sealing portion 420 is small, then the battery 10 may have a risk of leakage or the moisture in the environment may easily penetrate into the battery 10. If the width of the first edge sealing portion 420 is large, then the final volume of the battery 10 will be larger and the energy density of the battery 10 will be lower. Therefore, the width of the first edge sealing portion 420 needs to be within a reasonable range. The thickness of the first edge sealing portion 420 is the thickness of the first packaging film 400, which is mainly determined by the material of the first packaging film 400. Similarly, the packaging coefficient of the first packaging film 400 and the expansion coefficient of the first packaging film 400 are also determined by the material of the first packaging film 400. Specifically, after knowing the thickness of the first edge sealing portion 420, the packaging coefficient of the first packaging film 400 and the expansion coefficient of the first packaging film 400, the width of the first edge sealing portion 420 can be determined by λ1=a(D1 / H1), 0.5≤(H1 / (λ1(k1+5)))*10000≤4.5, wherein a is a constant, and a is mainly determined by the material of the first packaging film 400. The packaging coefficient specifically refers to the viscosity value of the first packaging film 400 adhered to the partition 300 after being hot-pressed by the hot press. The first packaging film 400 of different materials has different effects of adhering to the partition 300 under the hot pressing process.

[0041] It should be noted that the widths of the second edge sealing portion 430 and the third edge sealing portion 440 can also be calculated using the above principle. Specifically, the widths of the second edge sealing portion 430 and the third edge sealing portion 440 are equal to the width of the first edge sealing portion 420, and the thicknesses of the second edge sealing portion 430 and the third edge sealing portion 440 are equal to the thickness of the first edge sealing portion 420.

[0042] Furthermore, the sealing effect of the first packaging film 400 and the second packaging film 600 directly affects the safety and life of the battery 10. Once over-sealing and under-sealing are both likely to cause poor quality, it is necessary to strictly control the thickness and width of the sealing edge of the first packaging film 400 and the second packaging film 600 to avoid external moisture, air infiltration, electrolyte leakage and other problems. Further, the relationship between the packaging width and thickness of the sealing edge of the first packaging film 400 is introduced below. Specifically, in some embodiments, 15mm≤λ1≤55mm, 4.05≤k1≤9.51, 0.8≤a≤1.2. Specifically, when the relationship between the packaging width and thickness of the sealing edge of the first packaging film 400 satisfies the above formula, the first packaging film 400 has a better sealing effect. When λ1<15mm, this will result in poor packaging effect of the first packaging film 400, which may cause the battery 10 to have a risk of leakage or moisture in the environment to easily penetrate into the battery 10. When 55mm<λ1, the width of the first edge sealing portion 420 finally formed will be larger, thereby reducing the energy density of the battery 10. After the first packaging film 400 is connected to the partition 300 to form the first accommodating cavity 500, the first battery cell 100 will cause the first packaging film 400 to expand when the electrolyte reacts. The expansion coefficient of the first packaging film 400 refers to the degree to which the first packaging film 400 can expand under the action of external force. Among them, when k1<4.05, the expansion degree of the first packaging film 400 is small, which may cause the first battery cell 100 to pierce the first packaging film 400 or cause the first packaging film 400 to explode. When 9.51<k1, the expansion degree of the first packaging film 400 is large, that is, the deformation degree of the first packaging film 400 is large, so when the battery 10 is placed in an electronic device, the large expansion degree of the battery 10 will cause the battery 10 to squeeze other components in the electronic device.

[0043] Specifically, the following table may be referred to, wherein in the following table, λ may be either λ1 or λ2. Similarly, k may be either k1 or k2.

[0044] Table 1 Example parameters

[0045]

[0046] Table 2 Performance of Examples and Comparative Examples

[0047] Serial number 70℃24h Storage Thermal Measurement Swelling Package tension / N Example 1 0.8％ 45 Example 2 1.0％ 32 Example 3 0.9％ 54 Example 4 1.2％ 27 Example 5 1.1％ 28 Comparative Example 1 7.2％ 15 Comparative Example 2 6.5％ 26

[0048] Table 2 is explained below. The battery 10 is subjected to a 24-hour thermal storage swelling test at 70°C: the battery 10 is placed in a 70°C environment for 24 hours, then taken out and the thickness of the battery 10 is tested using 600PPG within 3 minutes. Swelling = (thickness after 24 hours at 70°C - thickness before test) / thickness before test.

[0049] Package tensile test: The seal position is tensile tested using a tensile tester.

[0050] The performance data shows that the packaging of the battery 10 of the embodiment is good, and the battery 10 does not swell even when left in a high temperature environment for a long time. However, in comparative examples 1 and 2, the swelling is large at high temperatures, indicating that the battery 10 has a broken gap that causes moisture in the environment to enter, triggering a side reaction and causing swell.

[0051] The width of the first edge sealing portion 420 is described above. In order to ensure the consistency of the first packaging film 400 and the second packaging film 600 in the battery 10, the width of the fourth edge sealing portion 620 is described below. In some embodiments, please refer to Figure 3 , the thickness of the fourth edge sealing portion 620 is H2, the width of the fourth edge sealing portion 620 is D2, the packaging coefficient of the second packaging film 600 is λ2, the expansion coefficient of the second packaging film 600 is k2, λ2=a(D2 / H2), 0.5≤(H2 / (λ2(k2+5)))*10000≤4.5, for example, D2=15mm, H2=0.065mm, then λ2=23mm. Among them, a is a constant, and a is mainly determined by the material of the first packaging film 400. Specifically, the width of the fourth edge sealing portion 620 determines whether the sealing of the battery 10 is good. If the width of the fourth edge sealing portion 620 is small, then the battery 10 may have a risk of leakage or the moisture in the environment may easily penetrate into the interior of the battery 10. If the width of the fourth edge sealing portion 620 is large, then the final volume of the battery 10 will be larger and the energy density of the battery 10 will be lower. Therefore, the width of the fourth edge sealing portion 620 needs to be within a reasonable range. The thickness of the fourth edge sealing portion 620 is the thickness of the second packaging film 600, which is mainly determined by the material of the second packaging film 600. Similarly, the packaging coefficient of the second packaging film 600 and the expansion coefficient of the second packaging film 600 are also determined by the material of the second packaging film 600. Specifically, after knowing the thickness of the fourth edge sealing portion 620, the packaging coefficient of the second packaging film 600 and the expansion coefficient of the second packaging film 600, the width of the fourth edge sealing portion 620 can be determined by λ2=(D2 / H2), 0.5≤(H2 / (λ2(k2+5)))*10000≤4.5.

[0052] It should be noted that the widths of the fifth edge sealing portion 630 and the sixth edge sealing portion 640 can also be calculated using the above principle. Specifically, the widths of the fifth edge sealing portion 630 and the sixth edge sealing portion 640 are both equal to the width of the fourth edge sealing portion 620, and the thicknesses of the fifth edge sealing portion 630 and the sixth edge sealing portion 640 are both equal to the thickness of the fourth edge sealing portion 620.

[0053] Further, in some embodiments, 15mm≤λ2≤55mm, 4.05≤k2≤9.51, 0.8≤a≤1.2. Specifically, when λ2<15mm, this will result in poor packaging effect of the second packaging film 600, which may cause the battery 10 to have a risk of leakage or moisture in the environment to easily penetrate into the battery 10. When 55mm<λ2, this will make the width of the fourth edge sealing portion 620 finally formed larger, thereby reducing the energy density of the battery 10. After the second packaging film 600 is connected to the partition 300 to form the second accommodating cavity 700, the second battery cell 200 will cause the second packaging film 600 to expand when the electrolyte reacts. The expansion coefficient of the second packaging film 600 refers to the degree to which the second packaging film 600 can expand under the action of external force. Among them, when k2<4.05, the expansion degree of the second packaging film 600 is small, which may cause the second battery cell 200 to pierce the second packaging film 600 or cause the second packaging film 600 to explode. When 9.51<k2, the second packaging film 600 expands to a greater extent, that is, the second packaging film 600 is deformed to a greater extent, so when the battery 10 is placed in an electronic device, the greater expansion of the battery 10 causes the battery 10 to squeeze into other components in the electronic device. Specifically, the experimental data can refer to the above-mentioned Table 1 and Table 2, which will not be described in detail here.

[0054] Further, in some embodiments, the width of the first edge sealing portion 420 is D1, 1mm≤D1≤3.8mm. Specifically, when D1<1mm, the width of the first edge sealing portion 420 is small, which may result in poor packaging effect of the first packaging film 400, thereby creating a risk of leakage. When 3.8mm<D1, the width of the first edge sealing portion 420 is large, which may make the final volume of the battery 10 larger, thereby making the energy density of the battery 10 lower. It should be noted that the widths of the second edge sealing portion 430 and the third edge sealing portion 440 can be equal to the width of the first edge sealing portion 420. It should be supplemented that the thickness of the first edge sealing portion 420 is H1, 45um≤H1≤115um.

[0055] Further, in order to ensure the consistency of the first packaging film 400 and the second packaging film 600, the width of the fourth edge sealing portion 620 is introduced below. In some embodiments, the width of the fourth edge sealing portion 620 is D2, 1mm≤D2≤3.8mm. Specifically, when D2<1mm, the width of the fourth edge sealing portion 620 is small, which may lead to poor packaging effect of the second packaging film 600, thereby generating the risk of leakage. When 3.8mm<D2, the width of the fourth edge sealing portion 620 is large, which may make the final volume of the battery 10 larger, thereby making the energy density of the battery 10 lower. It should be noted that the widths of the fifth edge sealing portion 630 and the sixth edge sealing portion 640 can be equal to the width of the fourth edge sealing portion 620. It should be supplemented that the thickness of the fourth edge sealing portion 620 is H2, 45um≤H2≤115um.

[0056] Further, in some embodiments, the thickness of the separator 300 is L, 10um≤L≤30um. Specifically, the separator 300 mainly serves to separate the first battery cell 100 and the second battery cell 200. When L<10um, the thickness of the separator 300 is thin, which will result in the separator 300 not being able to separate the first battery cell 100 and the second battery cell 200 effectively, thereby causing the risk of short circuit between the first battery cell 100 and the second battery cell 200. When 30um<L, the thickness of the separator 300 is large, which will result in a large final thickness of the battery 10, thereby reducing the energy density of the battery 10.

[0057] Further, in some embodiments, the material of the partition 300 is an insulating material. When the material of the partition 300 is an insulating material, the partition 300 can effectively prevent the first battery cell 100 and the second battery cell 200 from short-circuiting. The insulating material can specifically be a main body layer and an encapsulation layer, the encapsulation layer is wrapped in the main body layer, and the material of the main body layer can be a polymer material or a metal material, the polymer material is one of polytetrafluoroethylene, polypropylene carbonate, silicone, vinylon, polypropylene, acid-tincture modified polypropylene, and polyethylene, and the metal material is one of Ni, Cu, Fe, Al, Mg, Ti, Pt, and stainless steel. The encapsulation layer is one of polypropylene, acid-tincture modified polypropylene, polyethylene, and polystyrene.

[0058] In some embodiments, the electronic device includes the battery 10 of any one of the above embodiments. The first packaging film 400 is located on the first surface 310 of the partition 300, the second packaging film 600 is located on the second surface 320 of the partition 300, the first main body 410 and the first surface 310 of the partition 300 form a first accommodating cavity 500, the first battery cell 100 is disposed in the first accommodating cavity 500, the second main body 610 and the second surface 320 of the partition 300 form a second accommodating cavity 700, and the second battery cell 200 is disposed in the second accommodating cavity 700. In the prior art, the projection of the first edge sealing portion 420 is aligned with the first main body 410 in the thickness direction of the partition 300. 10 does not overlap, and the projection of the second edge sealing part 430 does not overlap with the projection of the second main body 610 in the thickness direction of the partition 300, which will increase the extra length of the battery 10, resulting in a lower energy density of the battery 10. In the present application, along the thickness direction of the partition 300, the first edge sealing part 420 is located between the first main body 410 and the first face 310, and along the thickness direction of the partition 300, the fourth edge sealing part 620 is located between the second main body 610 and the second face 320. Therefore, the battery 10 of the present application can have a higher energy density. Furthermore, the endurance of the electronic device with the battery 10 is better.

[0059] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: A first battery cell having a first tab; The second battery cell has a second electrode tab; A packaging structure, the packaging structure comprising: The partition includes a first surface and a second surface that are arranged opposite to each other; A first packaging film, comprising a first main body and a first edge sealing portion, wherein the first edge sealing portion is connected to the first surface, the first main body and the first surface jointly define a first accommodation cavity, and the first battery cell is arranged in the first accommodation cavity; the first edge sealing portion is arranged on a side away from the first electrode tab, and in the thickness direction of the partition, the first edge sealing portion is located between the first surface and the first main body; The second packaging film includes a second main body and a fourth edge sealing portion, wherein the fourth edge sealing portion is connected to the second surface, and the second main body and the second surface jointly define a second accommodating cavity, wherein the second battery cell is arranged in the second accommodating cavity; the fourth edge sealing portion is arranged on a side away from the second pole ear, and in the thickness direction of the partition, the fourth edge sealing portion is located between the second surface and the second main body.

2. The battery according to claim 1, characterized in that The thickness of the first edge sealing portion is H1, the width of the first edge sealing portion is D1, the packaging coefficient of the first packaging film is λ1, the expansion coefficient of the first packaging film is k1, λ1=a(D1 / H1), 0.5≤(H1 / (λ1(k1+5)))*10000≤4.

5.

3. The battery according to claim 2, characterized in that 15mm≤λ1≤55mm, 4.05≤k1≤9.51, 0.8≤a≤1.

2.

4. The battery according to claim 2, characterized in that The thickness of the fourth edge sealing portion is H2, the width of the fourth edge sealing portion is D2, the packaging coefficient of the second packaging film is λ2, the expansion coefficient of the second packaging film is k2, λ2=a(D2 / H2), 0.5≤(H2 / (λ2(k2+5)))*10000≤4.

5.

5. The battery according to claim 4, characterized in that 15mm≤λ2≤55mm, 4.05≤k2≤9.51, 0.8≤a≤1.

2.

6. The battery according to claim 1, characterized in that The first edge sealing portion is entirely attached to the partition; and / or the fourth edge sealing portion is entirely attached to the partition.

7. The battery according to claim 1, characterized in that A first chamfer is provided at a corner of the first accommodating cavity away from the partition, and the radius of the first chamfer is 0.5mm to 2mm; and / or a second chamfer is provided at a corner of the second accommodating cavity away from the partition, and the radius of the second chamfer is 0.5mm to 2mm.

8. The battery according to claim 1, characterized in that The width of the first edge sealing portion is D1, 1mm≤D1≤3.8mm.

9. The battery according to claim 8, characterized in that The width of the fourth edge sealing portion is D2, 1mm≤D2≤3.8mm.

10. An electronic device, characterized in that Comprising the battery as claimed in any one of claims 1 to 9.

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