CN116982202A - An electrochemical device and electronic equipment - Google Patents
An electrochemical device and electronic equipment Download PDFInfo
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- CN116982202A CN116982202A CN202280010287.9A CN202280010287A CN116982202A CN 116982202 A CN116982202 A CN 116982202A CN 202280010287 A CN202280010287 A CN 202280010287A CN 116982202 A CN116982202 A CN 116982202A
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- tab
- sealing
- electrochemical device
- glue
- housing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
一种电化学装置(100)以及电子设备，电化学装置(100)包括设有第一封印面(1222)的第一壳体(12)、设有第二封印面(1422)的第二壳体(14)、包括有第一极片组件(32)和第一极耳(34)的第一电极组件(30)、包括有第二极片组件(42)和第二极耳(44)的第二电极组件(40)、第一极耳胶(50)、第二极耳胶(60)以及隔离件(20)，隔离件(20)设于第一壳体(12)与第二壳体(14)之间，并形成收容第一极片组件(32)的第一腔体(101)和收容第二极片组件(42)的第二腔体(102)。第一极耳(34)包括两表面分别设有第一极耳胶(50)及第二极耳胶(60)的第一封印部(342)，第一封印部(342)的第一表面(3421)与第一封印面(1222)的距离D1小于第二表面(3422)与第二封印面(1422)的距离D2，设于第一表面(3421)上的第一极耳胶(50)的熔点为T1，设于第二表面(3422)上的第二极耳胶(60)的熔点为T2,满足T1>T2。如此，可以提高封印区(100a)的封装可靠性。
An electrochemical device (100) and electronic equipment. The electrochemical device (100) includes a first shell (12) provided with a first sealing surface (1222), and a second shell provided with a second sealing surface (1422). The body (14), the first electrode assembly (30) including the first pole piece assembly (32) and the first pole tab (34), the second pole piece assembly (42) and the second pole tab (44) The second electrode assembly (40), the first tab glue (50), the second tab glue (60) and the separator (20), the separator (20) is provided between the first housing (12) and the second Between the housings (14), a first cavity (101) for accommodating the first pole piece assembly (32) and a second cavity (102) for accommodating the second pole piece assembly (42) are formed. The first tab (34) includes a first sealing portion (342) with a first tab glue (50) and a second tab glue (60) respectively provided on two surfaces. The first surface of the first sealing portion (342) The distance D 1 between (3421) and the first sealing surface (1222) is less than the distance D 2 between the second surface (3422) and the second sealing surface (1422). The first tab glue provided on the first surface (3421) The melting point of (50) is T 1 , the melting point of the second tab glue (60) disposed on the second surface (3422) is T 2 , and T 1 >T 2 is satisfied. In this way, the packaging reliability of the sealing area (100a) can be improved.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to an electrochemical device and an electronic apparatus.
Background
Currently, batteries are widely used in electronic products such as unmanned aerial vehicles, mobile phones, flat panels, notebook computers and the like. Since a single cell is not capable of achieving the desired output power in certain application scenarios; therefore, a plurality of battery cells are generally connected in series, parallel or series-parallel with each other so that the plurality of battery cells cooperate together to achieve the desired power output. However, although the output power can be improved by connecting a plurality of battery cells in series, parallel or series-parallel connection, the energy density of the whole battery pack is low. Therefore, the design of the same-pouch serial/parallel battery is proposed, the same-pouch serial/parallel battery comprises a housing and a plurality of electrode assemblies arranged in the same housing, the electrode assemblies connected in series are separated by a separator to avoid decomposition of electrolyte under high voltage, the electrode assemblies connected in parallel are separated by the separator to avoid mutual interference, and the electrode lugs of the plurality of electrode assemblies extend out from the side edges of the housing to be connected outside the housing.
Disclosure of Invention
The inventors of the present application have found through studies that, since a separator exists between electrode assemblies in the same-pouch series/parallel battery, when packaging is performed by the heat sealing head, since the distances between the tab adhesives on the two opposite surfaces of the tab and the heat sealing head are different, uneven melting of the tab adhesives on the two surfaces of the tab is easily caused at the time of heat sealing, and there is a risk of poor seal.
In view of the above, the present application provides an electrochemical device and an electronic apparatus for improving the safety of the electrochemical device.
To solve the above technical problems, a first aspect of the present application: the utility model provides an electrochemical device, including first casing, second casing, separator, first electrode subassembly, second electrode subassembly, first utmost point ear is glued and second utmost point ear is glued, the separator is located between first casing and the second casing, electrochemical device is equipped with first cavity between first casing and the separator, electrochemical device is equipped with the second cavity between second casing and separator, first electrode subassembly includes first utmost point ear and accepts in first cavityThe first electrode tab assembly comprises a first electrode tab and a first electrode tab assembly accommodated in the first cavity, the electrochemical device comprises a sealing area, the first shell comprises a first sealing surface, the first sealing surface is located in the sealing area and is away from the separator, the second shell comprises a second sealing surface, the second sealing surface is located in the sealing area and is away from the separator, the first electrode tab comprises a first sealing portion located in the sealing area, and the first sealing portion comprises a first surface and a second surface which are opposite to each other. Along the thickness direction of the seal area, the first surface is adjacent to the first seal surface relative to the second surface, the second surface is adjacent to the second seal surface relative to the first surface, and the distance from the first surface to the first seal surface is D 1 The distance from the second surface to the second seal surface is D 2 ，D 1 <D 2 The method comprises the steps of carrying out a first treatment on the surface of the The first tab adhesive is arranged on the first surface, and the second tab adhesive is arranged on the second surface; wherein the melting point of the first tab adhesive is T 1 The melting point of the second electrode lug adhesive is T 2 Satisfy T 1 >T 2 . Therefore, when the sealing area is sealed, even if the temperature of the inner side of the sealing area far away from the sealing head is lower, the second tab adhesive still can be well melted due to the fact that the melting point of the second tab adhesive is smaller than that of the first tab adhesive, the phenomenon that the first tab adhesive is fully melted and the second tab adhesive is not melted or is insufficiently melted is reduced, sealing effect of the sealing area is improved, and safety of the electrochemical device is improved. Further, satisfy T 1 -T 2 Not less than 7 ℃. Further, T 1 -T 2 ≤40℃。
Optionally, the electrochemical device further includes a third electrode tab and a fourth electrode tab; the second lug comprises a second sealing part positioned in the sealing area, and the second sealing part comprises a third surface and a fourth surface which are opposite; along the thickness direction of the seal area, the third surface is adjacent to the first seal surface relative to the fourth surface, the fourth surface is adjacent to the second seal surface relative to the third surface, and the distance from the third surface to the first seal surface is D 3 The distance from the fourth surface to the second seal surface is D 4 The method comprises the steps of carrying out a first treatment on the surface of the The third ear glue is arranged on the third surface, and the fourth ear glue is arranged on the fourth surface; wherein the melting point of the third ear glue is T 3 Fourth poleThe melting point of the ear glue is T 4 Any one of the following conditions is satisfied: (1) D (D) 4 <D 3 ；T 4 >T 3 ；(2)D 3 <D 4 ；T 3 >T 4 . So, at the in-process of encapsulation, can make third ear glue and fourth ear glue all can be good hot melt, reduce the risk that only one of third ear glue and fourth ear glue is in the hot melt state, be favorable to improving the seal effect of second ear in the seal district, further improve electrochemical device's security. Further, satisfy T 4 -T 3 Not less than 7 ℃ or T 3 -T 4 Not less than 7 ℃. Further, satisfy T 4 -T 3 At a temperature of less than or equal to 40 ℃ or T 3 -T 4 ≤40℃。
Optionally, the thickness of the first tab adhesive is t 1 The thickness of the second ear glue is t 2 The method comprises the following steps: 1.5t 2 ≤t 1 ≤2t 2 . In this way, the thickness t of the first tab adhesive in the thickness direction of the seal area can be ensured 1 Thickness t of the second electrode adhesive 2 And the risk that the first tab adhesive is excessively extruded due to high temperature is reduced, so that the sealing effect of the sealing area is improved.
Alternatively, 0.075 mm.ltoreq.t 1 Less than or equal to 0.6mm. Alternatively, 0.05 μm.ltoreq.t 2 ≤0.3mm。
Optionally, the second ear glue has a final melting temperature Th 2 Meets Th 2 >T 1 . When the relation is met, when the second tab adhesive is completely melted, the first tab adhesive starts to melt, so that the first tab adhesive and the second tab adhesive are well sealed at the sealing area.
Optionally, the third ear glue has a final melting temperature Th 3 The final melting temperature of the fourth ear glue is Th 4 Any one of the conditions is satisfied: (d) D (D) 4 <D 3 ；T 4 -T 3 ≥7℃；Th 3 >T 4 ；(e)D 3 <D 4 ；T 3 -T 4 ≥7℃；Th 4 >T 3 . In this way, the third pole can be ensured during packagingWhen one of the ear glue and the fourth ear glue is completely melted, the other one is melted, so that the third ear glue and the fourth ear glue are simultaneously melted, the risk that only one of the third ear glue and the fourth ear glue is in a hot melting state is reduced, the third ear glue and the fourth ear glue are well fused at the sealing area, and the sealing effect of the second ear at the sealing area is improved.
Alternatively, th 2 -T 2 Not less than 25 ℃. Therefore, the second electrode lug adhesive has a wider melting range, and the risk of excessively melting and extruding the second electrode lug adhesive is reduced.
Optionally, the spacer includes a substrate layer and an encapsulation layer on a surface of the substrate layer.
Optionally, the first electrode assembly and the second electrode assembly are connected in series.
In a second aspect of the present application, there is also provided an electronic device including the above electrochemical apparatus.
The beneficial effects of the application are as follows: in the electrochemical device provided by the application, the distance between the first tab adhesive and the first sealing surface in the thickness direction of the sealing area is D 1 The distance between the second ear glue and the second seal surface is D 2 When D 1 ＜D 2 When the melting point T of the first tab adhesive is different from the melting point T of the second tab adhesive 1 Greater than the melting point T of the second ear adhesive 2 When the sealing area is sealed, even if the temperature of the inner side of the sealing area far away from the sealing head is lower, the second tab adhesive can be well melted because the melting point of the second tab adhesive is smaller than that of the first tab adhesive, the phenomenon that the first tab adhesive is fully melted and the second tab adhesive is not melted or is insufficiently melted is reduced, the sealing effect of the sealing area is improved, and the safety of the electrochemical device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings for those of ordinary skill in the art.
Fig. 1 is a schematic view showing the structure of an electrochemical device according to one embodiment of the present application;
FIG. 2 is an exploded view of one of the views of FIG. 1;
FIG. 3 is an exploded view of the structure of the other view of FIG. 1;
fig. 4 is a schematic view of fig. 1 taken along line MM;
fig. 5 is a schematic view of an electrode assembly in one embodiment in a rolled configuration;
FIG. 6 is a schematic view of another embodiment of an electrode assembly in a lamination stack;
FIG. 7 is a schematic illustration of the seal area with tab stock removed;
fig. 8 is an enlarged view of a portion a of fig. 4;
fig. 9 is a right side view of fig. 1.
Detailed Description
In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 4, one embodiment of the present application provides an electrochemical device 100 including a case 10, a separator 20, and an electrode assembly. The case 10 serves to define an enclosed space accommodating the electrode assembly, and the separator 20 serves to partition the inner space of the case 10, thereby increasing the number of independent cavities inside the case 10.
The electrochemical device 100 may include one separator 20 or a plurality of separators 20, and when the electrochemical device 100 includes one separator 20, one separator 20 may partition the inner space of the case 10 into two separate chambers, which are regarded as the first chamber 101 and the second chamber 102. When the electrochemical device 100 includes a plurality of separators 20, the plurality of separators 20 may partition the inner space of the case 10 into a plurality of independent cavities, for example, when the electrochemical device 100 specifically includes two separators 20, the two separators 20 may partition the inner space of the case 10 into three independent cavities; when the electrochemical device 100 includes three separators 20, the three separators 20 divide the inner space of the case 10 into four independent cavities.
In some embodiments, referring to fig. 2-4, the casing 10 includes a first casing 12 and a second casing 14, the electrochemical device is disposed between the first casing 12 and the separator 20, the first cavity 101 is disposed between the second casing 14 and the separator 20, the second cavity 102 is disposed between the first casing 12 and the second casing 14, and the separator 20 is disposed between the first casing 12 and the second casing 14. The first housing 12 is provided with a first packaging part 122, the first packaging part 122 is used for fixedly connecting (may be hot melt connection or bonding) with one surface of the spacer 20, the first packaging part 122 is provided with a first sealing surface 1222 facing away from the spacer 20, and the first sealing surface 1222 can contact the sealing head during packaging. The second housing 14 is provided with a second packaging part 142, the second packaging part 142 is used for fixedly connecting (may be hot melt connecting or bonding) with one surface of the spacer 20, the second packaging part 142 is provided with a second sealing surface 1422 facing away from the spacer 20, and the second sealing surface 1422 can contact the sealing head during packaging.
To facilitate an understanding of the possible presence of the housing 10, taking the shape of the housing 10 shown in fig. 1 as an example, in one case the first housing 12 and the second housing 14 are two parts independent of each other, and the four peripheral edges of the surfaces of the first housing 12 and the second housing 14 for sealing with the spacer 20 are sealed with the spacer. In one case, the two parts of the first housing 12 and the second housing 14 that are integrally connected, that is, the surfaces of the first housing 12 and the second housing 14 for sealing with the spacer 20 have one side edge that is integrally connected, that is, the housing 10 may be formed by folding in half after the first cavity 101 and the second cavity 102 are machined by a single piece of plate, so as to form the first housing 12 and the second housing 14.
The separator 20 includes a sealing region 21, and when the electrochemical device 100 is sealed, a portion of the separator 20 located in the sealing region 21 is sealed with other components. That is, the spacer 20 is fixedly connected (may be a heat-fusible connection or an adhesive) with other components at a portion of the encapsulation area 21. When the electrochemical device 100 has only one separator 20, both side wall surfaces of the encapsulation region 21 of the separator 20 are connected to the case 10. When the electrochemical device 100 has two separators 20, one side wall surface of the encapsulation region 21 of one of the separators 20 is connected to the other separator 20, and the other side wall surface is connected to the case 10. When the number of the spacers 20 is three or more, both side wall surfaces of the package region 21 of the spacer 20 located in the middle are connected to the other spacers 20 located on both sides of the spacer 20. For convenience of description, the following is a detailed description of the case where the electrochemical device includes only one separator 20.
In some embodiments, the encapsulation area 21 may have a "back" shape, and the encapsulation area 21 may extend to the position of the outer edge of the spacer 20, and the encapsulation area 21 may be spaced apart from the outer edge of the spacer 20. The encapsulation region 21 is fixedly connected with the first encapsulation part 122 and the second encapsulation part 142, thereby forming a sealing region 100a of the electrochemical device 100. In other embodiments, the enclosure 21 may be "concave" in shape, where the first housing 12 and the second housing 14 are integrally connected in two parts. In the present embodiment, the thickness direction Z of the seal area 100a refers to the direction in which the first package portion 122, the package area 21, and the second package portion 142 are stacked, and the thickness direction Z of the seal area 100a is the same as the thickness direction of the spacer 20.
The electrochemical device 100 may include two electrode assemblies or may include three or more electrode assemblies. For convenience of description, in the following embodiments, the electrochemical device 100 is illustrated as including two electrode assemblies, which are the first electrode assembly 30 and the second electrode assembly 40, respectively, as shown in fig. 4. When the electrochemical device 100 has one separator 20 and the separator 20 separates two independent cavities, the first electrode assembly 30 is disposed in the first cavity 101, and the second electrode assembly 40 is disposed in the second cavity 102. The first electrode assembly 30, the separator 20, and the second electrode assembly 40 are distributed along a first direction, which is the same as the thickness direction Z of the separator 20.
In some embodiments, the first electrode assembly 30 includes a first electrode tab assembly 32 and first tabs 34 connected to the first electrode tab assembly 32, at least two of the first tabs 34 having different polarities between at least two of the first tabs 34. The second electrode assembly 40 includes a second tab assembly 42 and second tabs 44 connected to the second tab assembly 42, at least two of the second tabs 44 having different polarities between at least two of the second tabs 44.
It will be appreciated that, in one aspect, the plurality of first tabs 34 and the plurality of second tabs 44 may each extend from the same side edge seal of the case 10 outside the case 10, and at least one first tab 34 is connected to one second tab 44, so that the first electrode assembly 30 is connected to the second electrode assembly 40. If the polarities of the connected first tab 34 and second tab 44 are the same, the first electrode assembly 30 and the second electrode assembly 40 are connected in parallel. If the polarities of the connected first tab 34 and second tab 44 are different, the first electrode assembly 30 and the second electrode assembly 40 are connected in series. On the other hand, the first tabs 34 and the second tabs 44 may extend out of the housing 10 from different edges of the housing 10, and at least one of the first tabs 34 is connected to the second tab 44.
To facilitate understanding of the structure of the first pole piece assembly 32 and the second pole piece assembly 42, the following description will take the first pole piece assembly 32 as an example, which is specifically described as follows:
referring to fig. 5 and 6, the first pole piece assembly 32 includes a first pole piece 322, a second pole piece 324, and a separation film 326, wherein the separation film 326 is disposed between the first pole piece 322 and the second pole piece 324, the polarities of the first pole piece 322 and the second pole piece 324 are opposite, and the separation film 326 is used for reducing the risk of short circuit caused by contact between the first pole piece 322 and the second pole piece 324.
In some embodiments, as shown in fig. 5, the first pole piece assembly 32 is a wound structure, i.e., the first pole piece 322, the separator 326, and the second pole piece 324 are stacked along the first thickness direction and wound along the first long side direction. The first thickness direction refers to a thickness direction of any one of the first pole piece 322, the separation film 326 and the second pole piece 324, and the first long side direction refers to a long side direction of any one of the first pole piece 322, the separation film 326 and the second pole piece 324. In the present embodiment, the first thickness direction is the same as the thickness direction Z of the separator 20. In other embodiments, as shown in fig. 6, the first pole piece assembly 32 is a laminated structure, i.e. the first pole piece 322, the isolating film 326 and the second pole piece 324 are stacked along the first thickness direction, where the number of the first pole piece 322, the isolating film 326 and the second pole piece 324 is plural, and one isolating film 326 is disposed between each first pole piece 322 and each second pole piece 324 along the first thickness direction. The first thickness direction refers to a thickness direction of any one of the first pole piece 322, the second pole piece 324, and the separator 326. The first thickness direction is the same as the thickness direction Z of the separator 20.
It will be appreciated that the configuration of the first pole piece assembly 32 may be adapted to the second pole piece assembly 42, either in the wound configuration as described above or in the laminated configuration as described above, and may be specifically selected according to the actual needs. The first pole piece assembly 32 and the second pole piece assembly 42 may be the same or different, for example, if the first pole piece assembly 32 is in a coiled configuration, the second pole piece assembly 42 may be in a coiled configuration or a laminated configuration.
Referring to fig. 7, the first tab 34 includes a first connection portion 341, a first seal portion 342, and a first extension portion 343 sequentially connected, the first connection portion 341 is configured to be connected to the first pole piece assembly 32, the first seal portion 342 is located in the seal area 100a, and the first extension portion 343 is located outside the housing 10. The first seal portion 342 includes a first surface 3421 and a second surface 3422 disposed opposite to each other.
The second tab 44 includes a second connection portion 441, a second seal portion 442, and a second extension portion 443, which are sequentially connected, the second connection portion 441 is configured to be connected to the second tab assembly 42, the second seal portion 442 is located in the seal area 100a, and the second extension portion 443 is located outside the housing 10. The second seal portion 442 includes a third surface 4421 and a fourth surface 4422 disposed opposite to each other.
The inventor of the present application has studied and found that when packaging a separator and a case, the part of a seal area close to a thermal head needs to be packaged in multiple layers, the part of the seal area close to the thermal head is packaged in low temperature, the part of the tab adhesive with low packaging temperature is easy to have poor fusion, and the part of the tab adhesive with high packaging temperature is easy to have over-fusion extrusion. As shown in fig. 8 and 9, the electrochemical device 100 of the present application further includes the first tab adhesive 50 and the second tab adhesive 60, wherein the melting point of the first tab adhesive 50 is T 1 The second ear glue 60 has a melting point T 2 . Melting point refers to the temperature at which a meltable element melts from a solid state to a liquid state upon passing a microscopic melting point tester.
In order to facilitate understanding of the arrangement of the first tab adhesive 50 and the second tab adhesive 60 in the thickness direction of the seal area 100a in the present application, the distribution of the first tab adhesive 50 and the second tab adhesive 60 in the first seal portion 342 of one of the first tabs 34 will be described below.
Referring again to fig. 7, along the thickness direction Z of the seal area 100a, the first surface 3421 is adjacent to the first seal surface 1222 relative to the second surface 3422, the second surface 3422 is adjacent to the second seal surface 1422 relative to the first surface 3421, and the distance from the first surface 3421 to the first seal surface 1222Leave as D 1 The distance from the second surface 3422 to the second seal surface 1422 is D 2 The method comprises the following steps: d (D) 1 <D 2 . The first tab adhesive 50 is disposed on the first surface 3421, the second tab adhesive 60 is disposed on the second surface 3422, and the T is then 1 ＞T 2 . In this way, the first tab adhesive 50 and the second tab adhesive 60 can be fully melted in the heat sealing process, so that the seal area 100a is sealed well, and the electrochemical device 100 has no leakage. Further, T 1 -T 2 ≥7℃。
In some embodiments, D 1 <D 2 ,T 1 ＞T 2 Taking the final melting temperature of the second ear glue 60 as Th 2 Meets Th 2 ＞T 1 . The final melting temperature refers to the temperature at which the meltable member just melts completely from a solid state to a liquid state when tested by a micro-melting point tester. When meeting Th 2 ＞T 1 When the first tab adhesive 50 begins to melt before the second tab adhesive 60 is completely melted, the risk of the second tab adhesive 60 on the second surface 3422 being excessively melted to affect the sealing effect is reduced. In some embodiments, the final melting temperature Th of the second ear glue 60 2 Melting point T with second ear glue 60 2 The difference between them is not less than 25 ℃, i.e. Th 2 -T 2 Not less than 25 ℃. Thus, the second ear adhesive 60 has a wider melting range, and the risk of excessive melting extrusion of the second ear adhesive 60 is reduced.
Similarly, the tab adhesive distribution on the surface of the second seal portion 442 is the same as that of the first seal portion 342, and in order to distinguish the tab adhesive disposed on the surface of the first seal portion 342, the tab adhesive disposed on the surface of the second seal portion 442 is the third tab adhesive 70 and the fourth tab adhesive 80, respectively, and the melting point of the third tab adhesive 70 is T 3 The fourth ear glue 80 has a melting point T 4 。
Along the thickness direction Z of the seal area 100a, the third surface 4421 is adjacent to the first seal surface 1222 with respect to the fourth surface 4422, the fourth surface 4422 is adjacent to the second seal surface 1422 with respect to the third surface 4421, and the distance from the third surface 4421 to the first seal surface 1222 is D 3 The distance from the fourth surface 4422 to the second seal surface 1422 is D 4 The method comprises the following steps: d (D) 3 ＞D 4 T is then 4 ＞T 3 . In this way, the third ear glue 70 and the fourth ear glue 80 can be fully melted in the heat sealing process, so that the seal area 100a is sealed well, and the electrochemical device 100 has no leakage. Further, T 4 -T 3 ≥7℃。
In some embodiments, D 3 ＞D 4 ,T 4 ＞T 3 Taking the final melting temperature of the third ear glue 70 as Th 3 Meets Th 3 ＞T 4 . When meeting Th 3 ＞T 4 When the third ear glue 70 is completely melted, the fourth ear glue 80 is melted, so that the risk of the third ear glue 70 on the third surface 4421 being excessively melted to affect the sealing effect is reduced. In some embodiments, the final melt temperature Th of the third ear glue 70 3 Melting point T with third ear glue 70 3 The difference between them is not less than 25 ℃, i.e. Th 3 -T 3 ≥25℃。
To facilitate understanding of the distribution of the tab adhesive on the surfaces of the first tab 34 of the first electrode assembly 30 and the second tab 44 of the second electrode assembly 40, the melting point T of the first tab adhesive 50 is set to 1 Greater than the melting point T of the second ear glue 60 2 Melting point T of third ear glue 70 3 Less than the melting point of the fourth electrode tab glue 80, taking the electrode assembly distribution case shown in fig. 9 as an example, along the thickness direction Z of the seal area 100a, the second electrode assembly 40 is located below the first electrode assembly 30 for the first electrode tab 34 connected with the second electrode tab 44, since the surface of the first electrode tab 34 for being connected with the separator 20 is affected by the thickness of the separator 20 connected with the first electrode assembly during seal, the surface of the first electrode tab 34 for being connected with the separator 20 should be the second surface 3422, that is, the second electrode tab glue 60 with a lower melting point should be provided, and the surface of the first electrode tab 34 facing away from the second electrode tab 44 should be the first surface 3421, that is, the first electrode tab glue 50 with a higher melting point should be provided. Similarly, the surface of the second tab 44 for connection to the spacer 20 should be the third surface 4421, i.e. the third ear glue 70 with a lower melting point should be provided, the surface of the second tab 44 facing away from the spacer 20 should be the fourth surface 4422, and the fourth surface 4422 should be provided with the fourth ear glue 80 with a higher melting point.
Similarly, when the electrochemical device 100 includes three or more electrode assemblies, one side close to the sealing surface of the case should be provided with a tab adhesive having a high melting point, and the other side should be provided with a tab adhesive having a low melting point along the sealing region 100a.
In some embodiments, as shown in fig. 8, the thickness t of the first tab adhesive 50 is 1 The second ear glue 60 has a thickness t 2 The method comprises the following steps: 1.5t 2 ≤t 1 ≤2t 2 The method comprises the steps of carrying out a first treatment on the surface of the In this way, the risk that the first tab adhesive 50 is excessively melted and extruded due to the higher temperature can be reduced, which is beneficial to improving the sealing effect of the sealing area.
In some embodiments, 0.075 mm.ltoreq.t 1 Less than or equal to 0.6mm. In some embodiments, 0.05 mm.ltoreq.t 2 ≤0.3mm。
In some embodiments, the spacer 20 includes a substrate layer and an encapsulation layer disposed on the substrate layer.
The material of the substrate layer comprises at least one of metal, carbon material or first polymer. The metal comprises at least one of Ni, ti, cu, ag, au, pt, fe, co, cr, W, mo, al, mg, K, na, ca, sr, ba, si, ge, sb, pb, I n, zn, stainless steel, and combinations or alloys thereof; the carbon material comprises at least one of a carbon felt, a carbon film, carbon black, acetylene black, fullerene, a conductive graphite film or a graphene film; the first polymer comprises polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyetheretherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylenenaphthalene, polyvinylidene fluoride, polypropylene carbonate, poly (vinylidene fluoride-hexafluoropropylene), poly (vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, anhydride modified polypropylene, polyethylene, ethylene-propylene copolymer, polyvinyl chloride, polystyrene, polyethernitrile, polyurethane, polyphenylene oxide, polyester, polysulfone, amorphous alpha-olefin copolymer, or at least one of the derivatives thereof.
The material of the packaging layer comprises a second polymer. The second polymer comprises: polypropylene, anhydride-modified polypropylene, polyethylene, ethylene-propylene copolymer, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyamide, polyester, amorphous alpha-olefin copolymer, or derivatives of at least one of the foregoing.
Example 1
Preparation of lithium ion batteries
(1) Preparing a negative electrode plate: mixing negative electrode active material artificial graphite, conductive carbon black (Super P) and Styrene Butadiene Rubber (SBR) according to a weight ratio of 96:1.5:2.5, adding deionized water, preparing into slurry with a solid content of 70wt%, and uniformly stirring. And uniformly coating the slurry on one surface of a negative current collector copper foil, and drying to obtain a negative electrode plate with a negative electrode active material layer coated on one side. Repeating the above steps on the other surface of the negative current collector copper foil to obtain the negative electrode plate with the negative electrode active material layer coated on both sides. After cold pressing, the negative electrode plate is cut into a specification of 41mm multiplied by 61mm for standby.
(2) Preparing a positive electrode plate: lithium cobalt oxide (LiCoO) as a positive electrode active material 2 ) Mixing conductive carbon black (Super P) and polyvinylidene fluoride (PVDF) according to a weight ratio of 97.5:1.0:1.5, adding N-methyl pyrrolidone (NMP), preparing into slurry with a solid content of 75wt%, and uniformly stirring. And uniformly coating the slurry on one surface of an aluminum foil of the positive electrode current collector, and drying to obtain the positive electrode plate with one side coated with the positive electrode active material layer. And repeating the steps on the other surface of the aluminum foil of the positive electrode current collector to obtain the positive electrode plate with the positive electrode active material layer coated on both sides. After cold pressing, the positive pole piece is cut into the specification of 38mm multiplied by 58mm for standby.
(3) Preparation of electrolyte: in a dry argon atmosphere, the organic solvents Ethylene Carbonate (EC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC) were first mixed in mass ratio EC: EMC: dec=30:50:20, and then lithium salt lithium hexafluorophosphate (LiPF) was added to the organic solvent 6 ) Dissolving and mixing uniformly to obtain LiPF based on electrolyte mass 6 Electrolyte with a concentration of 12.5%.
(4) Preparation of the first electrode assembly and the second electrode assembly: and sequentially stacking the diaphragm, the negative electrode plate, the diaphragm and the positive electrode plate to form a lamination structure, and fixing four corners of the whole lamination structure to obtain the electrode plate assembly. Each electrode assembly comprises a positive electrode lug and a negative electrode lug, wherein the positive electrode lug is aluminum (Al), the negative electrode lug is nickel (Ni), and the two electrode lugs are arranged side by side; the membrane is a Polyethylene (PE) membrane with a thickness of 15 μm.
(5) Preparation of the spacer: uniformly dispersing a packaging layer material polypropylene (PP, with a melting point of 140 ℃) into a dispersing agent N-methylpyrrolidone (NMP) to prepare a PP suspension; coating PP suspension on two sides of an aluminum layer with the thickness of 50 mu m by using a glue spreader; then, a drying process was performed at 130 c, wherein the thickness of the aluminum layer single-sided PP encapsulation layer was 25 μm and the total thickness of the separator was 100 μm.
(6) Electrode assembly: placing a first aluminum-plastic film (with the thickness of 150 mu m) formed by punching a pit into an assembly fixture, arranging a pit face upwards, placing a first electrode assembly into the pit, arranging first electrode lug glue on the surface, close to the first aluminum-plastic film, of a lug of the first electrode assembly, arranging second electrode lug glue on the surface, deviating from the first aluminum-plastic film (specific melting point and other parameters are shown in table 1), then placing a separator on the first electrode assembly, aligning edges, and applying external force to compress to obtain an assembled semi-finished product. Placing the assembled semi-finished product in an assembly fixture, placing a second electrode assembly on the separator with one side of the separator upwards, aligning edges, applying external force to compress, then covering the second electrode assembly with the pit surface of a second aluminum plastic film formed by pit punching downwards, arranging first tab glue on the surface of a tab of the second electrode assembly, which is close to the second aluminum plastic film, and arranging second tab glue on the surface of the tab of the second electrode assembly, which is away from the second aluminum plastic film (parameters such as specific melting point and the like are shown in Table 1). And leading the positive and negative electrode lugs of the first electrode assembly and the second electrode assembly out of the aluminum plastic film, and performing top sealing and side sealing in a hot pressing mode to obtain the assembled electrode assembly.
(7) And (5) filling liquid and packaging: electrolyte is respectively injected into each cavity, and the cavities are sealed after hot pressing, formation and degassing.
(8) And (3) series connection: and welding and connecting the negative electrode tab of the first electrode assembly and the positive electrode tab of the second electrode assembly together in a laser welding mode to realize series connection, and completing the assembly of the lithium ion battery.
Examples 2 to 5 and comparative examples
The only difference from example 1 is the selection of the first and second tab gels, see in particular table 1.
TABLE 1 electrochemical device packaging test sheet for first and second electrode tabs having different thickness and melting point
The test results obtained in examples 1-6 and comparative example in Table 1 were obtained by the following methods: the shell and the separator at one side of the packaging area are clamped by the clamp through the multifunctional stripping equipment, then the shell and the separator are pulled, so that the first packaging part or the second packaging part of the shell is separated from the packaging area of the separator, the situation of the adhesive position of the separated tab is observed, and if the color of the separated tab is milky white, the tab adhesive is well fused; if the local milky color is not obvious, the tab adhesive is not fused well. As can be seen from a comparison of examples 1-6 in Table 1 with the comparative example, when T 1 -T 2 And when the temperature is more than or equal to 7 ℃, the sealing area 100a of the electrochemical device 100 is well fused, which indicates that when the melting point of the first tab adhesive is greater than that of the second tab adhesive, the second tab adhesive 60 can be well fused, so that the packaging reliability and safety of the electrochemical device are improved.
The application also provides electronic equipment which comprises the electrochemical device provided by the application. The electronic device of the present application is not particularly limited, and may be any electronic device known in the art. For example, electronic devices include, but are not limited to, notebook computers, pen-input computers, mobile computers, electronic book players, portable telephones, portable fax machines, portable copiers, portable printers, headsets, video recorders, liquid crystal televisions, hand-held cleaners, portable CD-players, mini-compact discs, transceivers, electronic organizers, calculators, memory cards, portable audio recorders, radios, backup power supplies, motors, automobiles, motorcycles, mopeds, bicycles, lighting fixtures, toys, game consoles, timepieces, power tools, flashlights, cameras, home-use large-scale storage batteries, lithium ion capacitors, and the like.
It should be noted that the description of the present application and the accompanying drawings illustrate preferred embodiments of the present application, but the present application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the application, but are provided for a more thorough understanding of the present application. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present application described in the specification; further, modifications and variations of the present application may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this application as defined in the appended claims.
Claims (10)
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| PCT/CN2022/086387 WO2023197160A1 (en) | 2022-04-12 | 2022-04-12 | Electrochemical apparatus and electronic device |
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| CN106784998B (en) * | 2017-01-22 | 2024-10-15 | 宁德新能源科技有限公司 | Secondary battery and heating device |
| JP2019145628A (en) * | 2018-02-20 | 2019-08-29 | Tdk株式会社 | Active material particles and power storage device including the same |
| WO2022000328A1 (en) * | 2020-06-30 | 2022-01-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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