CN114597552A - Electrochemical device and electronic device - Google Patents
Electrochemical device and electronic device Download PDFInfo
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- CN114597552A CN114597552A CN202210301910.8A CN202210301910A CN114597552A CN 114597552 A CN114597552 A CN 114597552A CN 202210301910 A CN202210301910 A CN 202210301910A CN 114597552 A CN114597552 A CN 114597552A
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application discloses an electrochemical device and an electronic device. The electrochemical device includes a first case, a second case, first to third separators, and first to third electrode assemblies. The first shell, the first isolating piece, the second isolating piece and the second shell are arranged in sequence. The distance between the first main body part of the first isolating piece and the first plane is smaller than the distance between the second main body part of the second isolating piece and the first plane, and the thermal conductivity of the first isolating piece is larger than that of the second isolating piece. Wherein the electrochemical device has opposing first and second surfaces; the first plane is perpendicular to the thickness direction of the electrochemical device, and distances between the first plane and the second plane are equal. The electrochemical device can have good heat dissipation properties, and thus can have improved cycle life and safety in high output applications.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to an electrochemical device and an electronic device.
Background
In some application scenarios, a single battery cell such as lithium/sodium ion cannot achieve the desired output power; therefore, a plurality of lithium/sodium ion battery cells are generally connected in series or in parallel or in series-parallel with each other so that the plurality of lithium/sodium ion battery cells cooperate together to achieve an output of a desired power. However, although the output power can be improved by connecting a plurality of lithium/sodium ion battery cells in series, in parallel or in series-parallel, the energy density of the entire battery pack is low. Therefore, a design of an internal series or parallel battery is proposed, in which the internal series or parallel battery includes a case and a plurality of series or parallel electrode assemblies disposed in the case, and the series electrode assemblies are separated from each other by a separator to prevent decomposition of an electrolyte at a high voltage. However, in high output applications, there is still insufficient heat dissipation from the internal series or parallel cells, presenting a safety risk.
Disclosure of Invention
The present application is directed to an electrochemical device and an electronic device to improve the heat dissipation performance of internal series or parallel cells, thereby having a good cycle life and safety in high output applications.
The following technical scheme is adopted for solving the technical problems:
in a first aspect, the present application provides an electrochemical device including a first case, a second case, a first separator, a second separator, a third separator, a first electrode assembly, a second electrode assembly, and a third electrode assembly. Wherein the first casing and the second casing are oppositely arranged along the thickness direction of the electrochemical device. The first separator is located between the first casing and the second separator, the second separator is located between the first casing and the second casing, the electrochemical device is provided with a first accommodating space between the first casing and the first separator, the electrochemical device is provided with a second accommodating space between the first separator and the second separator, and the electrochemical device is provided with a third accommodating space between the second separator and the second casing. The first electrode assembly is arranged in the first accommodating space, the second electrode assembly is arranged in the second accommodating space, and the third electrode assembly is arranged in the third accommodating space. The first separator includes a first body portion between the first electrode assembly and the second electrode assembly, and the second separator includes a second body portion between the second electrode assembly and the third electrode assembly; the distance between the first main body part and the first plane is smaller than the distance between the second main body part and the first plane, and the following requirements are met: the thermal conductivity of the first spacer is greater than the thermal conductivity of the second spacer. Wherein, along the thickness direction of the electrochemical device, the electrochemical device is provided with a first surface and a second surface which are opposite, the first plane is perpendicular to the thickness direction of the electrochemical device, and the distances from the first plane to the first surface and the second surface are equal.
Through being closer to the central plane with the first main part in the first isolator than the second main part in the second isolator to make the heat conductivity of first isolator be greater than the heat conductivity of second isolator, this setting makes first isolator can be more rapidly with heat transfer to the casing in order to realize the heat dissipation than the second isolator, and then alleviates or avoids electrochemical device central area high temperature risk when high output is used, and then improves electrochemical device's cycle life and security.
In some embodiments, at least one third spacer is further included between the first housing and the first spacer. The thermal conductivity of the first separator and each of the third separators decreases in order in a direction in which the first separator is directed toward the first housing.
This setting makes the third separator that is close to first separator more, and its thermal conductivity is bigger, and then can more easily with the heat effluvium of being close to electrochemical device intermediate position to make this electrochemical device temperature everywhere comparatively even in the use, reduce inside overheated risk.
In some embodiments, the thermal conductivity of the first spacer is λ1，λ1Not less than 30W/(m.K). At this time, the heat inside the electrochemical device can be more quickly transferred to the periphery of the casing, and the risk of overheating inside the electrochemical device is reduced.
In some embodiments, the thermal conductivity of the second spacer is λ2，0.2 W/（m·K）≤λ2Less than or equal to 5W/(m.K). At the moment, when the overall temperature of the electrochemical device is higher, the internal heat can be dissipated in time, and the risk of thermal runaway is reduced; when the electrochemical device works in a low-temperature environment and the overall temperature is still low, the heat generated inside the electrochemical device can be prevented from being dissipated too quickly, so that the temperature inside the electrochemical device can be quickly raised to a proper working temperature.
In some embodiments, the first separator comprises a first substrate layer having a thermal conductivity λ11(ii) a The second isolating piece comprises a second base material layer, and the thermal conductivity of the second base material layer is lambda21，λ11>λ21. Because the heat conductivity of first substrate layer is greater than the heat conductivity of second substrate layer, so first substrate layer is higher with the inside heat transfer of electrochemical device to casing efficiency all around, is favorable to reducing the temperature of electrochemical device intermediate position better.
In some embodiments, the first spacer further comprises an insulating first encapsulation layer and an insulating second encapsulation layer; the first substrate layer is located between the first packaging layer and the second packaging layer. In some embodiments, the second spacer further comprises an insulating third encapsulation layer and an insulating fourth encapsulation layer, the second substrate layer being located between the third encapsulation layer and the fourth encapsulation layer.
The arrangement of the first packaging layer and the second packaging layer can avoid the short circuit of the first electrode assembly (and the second electrode assembly) caused by the fact that the two electrode lugs connected with the first electrode assembly (and the second electrode assembly) are electrically connected with the first base material layer; while also facilitating encapsulation of the first spacer, which may be attached to an adjacent component by heat staking, for example.
In some embodiments, the material of the first substrate layer includes at least one of a metal or a carbon material. In some embodiments, the material of the second substrate layer comprises a polymer.
In some embodiments, the metal comprises at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Sn, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Ge, Sb, Pb, In, Zn, or stainless steel. The carbon material includes at least one of a carbon felt, a carbon film, carbon black, acetylene black, fullerene, a conductive graphite film, or a graphene film. The polymer includes polyetheretherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, 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 derivatives thereof.
In some embodiments, the first housing includes a first cavity portion recessed toward a side facing away from the second housing to form a cavity, and a first peripheral portion surrounding the first cavity portion. The second housing includes a second cavity portion opposite the first cavity portion and a second peripheral portion opposite the first peripheral portion. The first spacer includes a first encapsulant portion disposed around the first body portion, the second spacer includes a second encapsulant portion surrounding the second body portion, the first encapsulant portion is located between the first and second peripheral portions, and the second encapsulant portion is located between the first and second peripheral portions.
The above arrangement allows the electrochemical device to have a first accommodation space between the first separator and the first case, a second accommodation space between the first separator and the second separator, and a third accommodation space between the second separator and the second case.
In some embodiments, the first electrode assembly, the second electrode assembly, and the third electrode assembly are connected in series, parallel, or series-parallel.
In a second aspect, the present application also provides an electronic device comprising the electrochemical device described above.
Due to the fact that the electrochemical device comprises the electrochemical device, the electronic device provided by the embodiment of the application has good service life and safety.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic perspective view of an electrochemical device according to an embodiment of the present disclosure;
FIG. 2 is a side view of the electrochemical device of FIG. 1;
FIG. 3 is an exploded view of the electrochemical device of FIG. 1;
FIG. 4 is a schematic sectional view of the electrochemical device taken along line A-A;
FIG. 5 is a partial enlarged view of the portion B in FIG. 4;
FIG. 6 is a perspective view of the first spacer of FIG. 3;
FIG. 7 is an enlarged partial schematic view at C of FIG. 6;
FIG. 8 is a perspective view of the second spacer of FIG. 3;
FIG. 9 is an enlarged partial view of FIG. 8 at D;
fig. 10 is a schematic view of an electronic device according to an embodiment of the disclosure.
In the figure:
1. an electrochemical device;
100. a first housing; 110. a first cavity portion; 120. a first peripheral portion; 101. a first accommodating space; 102. a second accommodating space; 103. a third accommodating space; 104. a fourth accommodating space; 105. a first surface; 106. a second surface;
200. a second housing; 210. a second cavity portion; 220. a second peripheral portion;
300. a first spacer; 310. a first main body portion; 320. a first connection portion; 330. a first package portion; 340. a first base material layer; 350. a first encapsulation layer; 360. a second encapsulation layer;
400. a second spacer; 410. a second main body portion; 420. a second connecting portion; 430. a second package portion; 440. a second substrate layer; 450. a third encapsulation layer; 460. a fourth encapsulation layer;
500. a third separator; 510. a third main body portion; 520. a third package portion;
600. a first electrode assembly;
700. a second electrode assembly;
800. a third electrode assembly;
900. a fourth electrode assembly;
910. a tab module; 911. a first tab; 912. a second tab;
2. an electronic device.
Detailed Description
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to"/"mounted 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 intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive 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 present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
In this specification, the term "mount" includes welding, screwing, clipping, adhering, etc. to fix or restrict a certain element or device to a specific position or place, the element or device may be fixed or movable in a limited range in the specific position or place, and the element or device may be dismounted or not dismounted after being fixed or restricted to the specific position or place, which is not limited in the embodiment of the present application.
Referring to fig. 1 to 3, which respectively illustrate a perspective view of an electrochemical device 1, a side view of the electrochemical device 1, and an exploded view of the electrochemical device 1 according to an embodiment of the present disclosure, the electrochemical device 1 includes a first case 100, a second case 200, a first separator 300, a second separator 400, a first electrode assembly 600, a second electrode assembly 700, and a third electrode assembly 800. The first casing 100 and the second casing 200 are disposed opposite to each other in the thickness direction X of the electrochemical device 1, and together enclose an outer casing of the electrochemical device 1. The first spacer 300 is located between the first case 100 and the second spacer 400, and the second spacer 400 is located between the first spacer 300 and the second case 200. Referring to fig. 4 and fig. 5, which respectively show a sectional view of the electrochemical device 1 along the line a-a shown in fig. 1 and a partially enlarged view of the portion B, a first accommodating space 101 is formed between the first casing 100 and the first separator 300 of the electrochemical device 1; the electrochemical device 1 has a second accommodating space 102 between the first separator 300 and the second separator 400; the electrochemical device 1 has a third accommodating space 103 between the second separator 400 and the second housing 200. The first electrode assembly 600 is disposed in the first receiving space 101, the second electrode assembly 700 is disposed in the second receiving space 102, and the third electrode assembly 800 is disposed in the third receiving space 103. The first separator 300 includes a first body part 310 between the first electrode assembly 600 and the second electrode assembly 700, and the second separator 400 includes a second body part 410 between the second electrode assembly 700 and the third electrode assembly 800. TheThe distance between the first body part 310 and the first plane M is smaller than the distance between the second body part 410 and the first plane M, and the thermal conductivity λ of the first spacer 3001Greater than the thermal conductivity lambda of the second separator 4002. Wherein, along the thickness direction X, the electrochemical device 1 has a first surface 105 and a second surface 106 which are oppositely arranged; the "first plane" described in this document is located between the first surface 105 and the second surface 106, which is shown as a center line in fig. 2 for ease of reading; the distance between the first plane M and the first surface 105 is a first distance D1The distance between the first plane M and the second surface 106 is a second distance D2The first distance D1Is equal to the second distance D2。
In the present embodiment, the electrochemical device 1 includes a third separator 500 and a fourth electrode assembly 900 in addition to the above-described components. In order to better understand the specific structure of the electrochemical device 1, the first case 100, the second case 200, the first separator 300, the second separator 400, the third separator 500, the first electrode assembly 600, the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900 will be described in sequence.
Referring to fig. 3, with reference to the first casing 100 and the second casing 200, the first casing 100 and the second casing 200 are disposed oppositely along the thickness direction X of the electrochemical device 1, and define a receiving space therebetween. The first casing 100 is a box-like structure including a first cavity 110 and a first peripheral portion 120. The first cavity portion 110 is recessed toward a side away from the second housing 200 to form a cavity. Specifically, the first cavity portion 110 includes a first bottom wall and a first side wall extending from an edge of the first bottom wall along the thickness direction X, and the first bottom wall and the first side wall together enclose the cavity; the cavity of the first cavity portion 110 is disposed toward the second housing 200. The first peripheral portion 120 is a thin plate-like structure, and extends outward from the open end of the first cavity portion 110, and is disposed around the first cavity portion 110. Similarly, the second housing 200 is also a generally box-like structure, and includes a second cavity 210 disposed opposite to the first cavity 110 and a second peripheral 220 disposed opposite to the first peripheral 120. Wherein, the second cavity portion 210 is recessed toward a side away from the first housing 100 to form a cavity. In this embodiment, the second cavity 210 includes a second bottom wall and a second side wall extending from an edge of the second bottom wall along the thickness direction X, and the second bottom wall and the second side wall jointly enclose a cavity of the second cavity 210; the cavity of the second cavity portion 210 is disposed toward the first housing 100. The second peripheral portion 220 has a sheet-like structure, and is formed to extend outwardly from the open end of the second chamber portion 210 and is disposed around the second chamber portion 210. The electrochemical device 1 has a first surface 105 and a second surface 106 disposed opposite to each other along the thickness direction X; the first surface 105 is a surface of the first cavity 110 facing away from the second housing 200, and the second surface 106 is a surface of the second cavity 210 facing away from the first housing 100. In this embodiment, the first housing 100 and the second housing 200 are two independent structures, and the cavities of the first cavity portion 110 and the second cavity portion 210 are formed by stamping. It is understood that, in other embodiments of the present application, the first casing 100 and the second casing 200 may be integrally formed; specifically, the same sheet-like structure is folded after punching two cavities to form the first casing 100 and the second casing 200 which are oppositely arranged.
As for the materials of the first casing 100 and the second casing 200, the materials are various. Taking the first casing 100 as an example, in the present embodiment, the first casing 100 includes a first insulating material layer, a metal base material layer, and a second insulating material layer, which are stacked. Along the thickness direction of the sheet of the first case 100, a first metal base material layer is provided between the first insulating material layer provided facing the first separator 300 and the second insulating material layer provided facing away from the first separator 300. Optionally, the material of the metal substrate layer comprises aluminum, and the material of the first insulating material layer and/or the second insulating material layer comprises polypropylene; of course, other embodiments of the present application can also be modified based on the above, for example, the metal substrate layer includes an aluminum alloy, a copper alloy, etc., and the first insulating material layer and/or the second insulating material layer includes at least one of modified polypropylene, polyethylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, or ethylene-ethyl acrylate copolymer. The second housing 200 is substantially the same as the first housing 100 in terms of structure and material selection, which is not repeated herein.
Referring to fig. 3, the first separator 300, the second separator 400 and the third separator 500 are all located between the first casing 100 and the second casing 200 and extend in the thickness direction X, and the first casing 100, the third separator 500, the first separator 300, the second separator 400 and the second casing 200 are sequentially disposed. The first separator 300 and the third separator 500 together define a first accommodating space 101, the first separator 300 and the second separator 400 together define a second accommodating space 102, the second separator 400 and the second housing 200 together define a third accommodating space 103, and the third separator 500 and the first housing 100 together define a fourth accommodating space 104; that is, the electrochemical device 1 has a first accommodating space 101 between the first separator 300 and the third separator 500, a second accommodating space 102 between the first separator 300 and the second separator 400, a third accommodating space 103 between the second separator 400 and the second casing 200, and a fourth accommodating space 104 between the third separator 500 and the first casing 100.
First, the first separator 300 will be explained below. Referring to fig. 6 and 7, a perspective view of the first spacer 300 and a partial enlarged view at C are shown in combination with fig. 3; in this embodiment, the first spacer 300 is a sheet structure, and includes a first main body portion 310, a first connection portion 320, and a first encapsulation portion 330. The first body 310 is located in the receiving space, has a flat sheet shape, and is used for separating the first electrode assembly 600 from the second electrode assembly 700; that is, the first body part 310 is disposed between the first electrode assembly 600 and the second electrode assembly 700. The first body 310 is spaced apart from the first plane M by a first distance. The first connection portion 320 is formed extending from an edge of the first body portion 310; for example, in the present embodiment, the first connecting portion 320 is formed by extending from the edge of the first main body portion 310 away from the first casing 100, so that the first isolation member 300 has a cavity disposed toward the second casing 200. The first package portion 330 is formed by extending outwardly from an end of the first connection portion 320 away from the first body portion 310, and is disposed around the first body portion 310. The first encapsulating portion 330 is located between the first peripheral portion 120 and the second peripheral portion 220, thereby facilitating encapsulation of the first separator 300. It is to be understood that even though the first separator 300 is provided as above and has a cavity in the present embodiment, the present application is not limited thereto as long as the first separator 300 is ensured to have the above-described first body part 310 and first sealing part 330 to achieve the separation of the first electrode assembly 600 from the second electrode assembly 700 and the sealing of the first separator 300 itself; for example, in other embodiments of the present application, the first spacer 300 does not have the cavity described above, but rather is in the form of a flat sheet.
The second separator 400 will then be described. Referring to fig. 8 and 9, a perspective view and a partial enlarged view at D of the second spacer 400 are shown in combination with fig. 3; the second spacer 400 is also a sheet structure, and includes a second main body portion 410, a second connecting portion 420 and a second packaging portion 430. A second body 410, which is located in the receiving space, is in a flat sheet shape, and is located between the first body 310 and the second case 200, wherein the second body 410 is used for separating the second electrode assembly 700 from the third electrode assembly 800; that is, the second body part 410 is located between the second electrode assembly 700 and the third electrode assembly 800. The second body portion 410 is spaced apart from the first plane M by a second distance, which is greater than the first distance. The second connection part 420 is formed extending from an edge of the second body part 410; for example, in the present embodiment, the second connecting portion 420 is formed by extending from the second main body portion 410 away from the second housing 200, so that the second isolation member 400 has a cavity disposed toward the first housing 100. The second package portion 430 is formed by extending outward from one end of the second connecting portion 420 away from the second main body portion 410, and is integrally disposed around the second main body portion 410; the second packing portion 430 is located between the first packing portion 330 and the second peripheral portion 220, thereby facilitating the packing of the second separator 400; in other words, the first sealing portion 330 is located between the second sealing portion 430 and the first peripheral portion 120. It is to be understood that even though the second separator 400 is provided as above and has a cavity in the present embodiment, the present application is not limited thereto as long as the second separator 400 is ensured to have the above-described second body part 410 and second sealing part 430 to achieve the separation of the second electrode assembly 700 from the third electrode assembly 800 and the sealing of the second separator 400 itself; for example, in other embodiments of the present application, the second spacer 400 does not have the cavity described above, but rather is in the form of a flat sheet.
Next, the third separator 500 will be explained. The third spacer 500 is located between the first spacer 300 and the first casing 100, and includes a third body portion 510 and a third encapsulation portion 520. The third body 510 is located in the receiving space and has a flat sheet shape; the third body portion 510 is located between the first body portion 310 and the first case 100, and is used for separating the first electrode assembly 600 from the fourth electrode assembly 900; that is, the third body portion 510 is located between the first electrode assembly 600 and the fourth electrode assembly 900. The third body portion 510 has a third distance from the first plane M, and the third distance is greater than the first distance. The third sealing portion 520 is disposed around the third main body portion 510 and located between the first sealing portion 330 and the first peripheral portion 120.
With reference to fig. 3 and fig. 5, referring to the first electrode assembly 600, the second electrode assembly 700, the third electrode assembly 800 and the fourth electrode assembly 900, and with reference to other drawings, the first electrode assembly 600 is accommodated in the first accommodating space 101, the second electrode assembly 700 is accommodated in the second accommodating space 102, the third electrode assembly 800 is accommodated in the third accommodating space 103, and the fourth electrode assembly 900 is accommodated in the fourth accommodating space 104, which are core components of the electrochemical device 1. The first electrode assembly 600 includes a first pole piece, a second pole piece, and a separator disposed therebetween, which are stacked. One of the first pole piece and the second pole piece is an anode piece, and the other is a cathode piece; the isolating film is arranged between the first pole piece and the second pole piece so as to prevent the first pole piece from being in electric contact with the second pole piece. In this embodiment, the first electrode assembly 600 is a winding structure, and is integrally wound to be flat, so as to be conveniently accommodated in the first accommodating space 101; it is understood that in other embodiments of the present application, the first electrode assembly 600 may also be of a laminated structure, i.e., stacked in a predetermined direction, such as the thickness direction, with a separator disposed between adjacent first and second pole pieces. The structures of the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900 are substantially the same as the structure of the first electrode assembly 600, respectively, and thus, the description thereof is omitted.
In addition, in order to facilitate the electron flow between the electrode assemblies and the external electrical load, the electrochemical device further includes a plurality of tab modules 910, and at least one tab module 910 is correspondingly connected to each of the first electrode assembly 600, the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900. With reference to fig. 3, the tab module 910 includes a first tab 911 and a second tab 912. In the tab module 910 connected to the first electrode assembly 600, one end of the first tab 911 is connected to the first pole piece of the first electrode assembly 600, and the other end thereof protrudes out of the case portion through between the first separator 300 and the third separator 500; one end of the second tab 912 is connected to the second pole piece of the first electrode assembly 600, and the other end thereof protrudes out of the case portion through between the first separator 300 and the third separator 500. The connection relationship of the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900 to the tab module 910 is substantially the same as that of the first electrode assembly 600, respectively. Specifically, in the tab module 910 connected to the second electrode assembly 700, one end of the first tab 911 is connected to the first pole piece of the second electrode assembly 700, and the other end thereof protrudes out of the housing portion through the space between the first separator 300 and the second separator 400; one end of the second tab 912 is connected to the second pole piece of the second electrode assembly 700, and the other end thereof protrudes out of the case portion through between the first separator 300 and the second separator 400. Similarly, in the tab module 910 connected to the third electrode assembly 800, one end of the first tab 911 is connected to the first pole piece of the third electrode assembly 800, and the other end of the first tab extends out of the housing through the space between the second separator 400 and the second case 200; one end of the second tab 912 is connected to the second pole piece of the third electrode assembly 800, and the other end thereof protrudes out of the case portion through the region between the second separator 400 and the second case 200. Similarly, in the tab module 910 connected to the fourth electrode assembly 900, one end of the first tab 911 is connected to the first pole piece of the fourth electrode assembly 900, and the other end of the first tab extends out of the housing portion through the space between the third separator 500 and the first casing 100; one end of the second tab 912 is connected to the second pole piece of the fourth electrode assembly 900, and the other end thereof extends out of the housing portion through the space between the third separator 500 and the first case 100.
In this embodiment, the fourth electrode assembly 900, the first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800 are connected in series. Specifically, the second tab 912 to which the fourth electrode assembly 900 is connected is electrically connected with the first tab 911 to which the first electrode assembly 600 is connected; the second tab 912, to which the first electrode assembly 600 is connected, is electrically connected with the first tab 911, to which the second electrode assembly 700 is connected; the second tab 912, to which the second electrode assembly 700 is connected, is electrically connected with the first tab 911, to which the third electrode assembly 800 is connected. Thus, the fourth electrode assembly 900, the first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800 are sequentially connected in series, thereby providing a higher voltage to an external load; the first tab 911 to which the fourth electrode assembly 900 is connected and the second tab 912 to which the third electrode assembly 800 is connected are used for a load of an external electronic device. Compared to the scheme of externally connecting a plurality of electrochemical devices in series on the current market, the electrochemical device 1 is configured such that the first electrode assembly 600, the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900 are collectively disposed within the case and are separated by the first separator 300, the second separator 400, and the third separator 500; therefore, the first separator 300 (or the second separator 400 or the third separator 500) can replace the wall of the housing of two adjacent electrochemical devices, which is beneficial to reducing the overall occupied space of the electrochemical device 1, and further improving the energy density of the electrochemical device 1. Meanwhile, the electrochemical device 1 can also omit an external connecting lead, which is beneficial to reducing the overall resistance of the electrochemical device 1 in use; in addition, since the process of wire connection is omitted, the connection process of the electrochemical device 1 to an external electric load is more convenient. It is understood that, in other embodiments of the present application, the first electrode assembly 600, the second electrode assembly 700, the third electrode assembly 800, and the fourth electrode assembly 900 may be connected in parallel or in series, and the specific electrical connection manner thereof is not limited in the present application.
It is worth mentioning that the heat dissipation performance of the electrochemical device 1 plays an important role in whether it can be used normally and safely for a long time. If the heat dissipation performance of the electrochemical device 1 is not good, on one hand, the battery capacity of the electrochemical device 1 is obviously attenuated after long-term use, so that the normal power supply duration of the electrochemical device 1 is influenced, and the use experience of a user is reduced; on the other hand, the electrochemical device 1 may expand significantly during a long-term use, and even may cause safety accidents such as fire and explosion when the temperature is raised to a high level. That is, the heat dissipation performance of the electrochemical device 1 has a large influence on the capacity retention rate and the expansion rate thereof.
With respect to the electrochemical device 1 provided in the embodiment of the present application, since the plurality of electrode assemblies are included inside, heat of the electrode assemblies and the electrolyte in different accommodating spaces is dissipated to the air or components in contact with the electrochemical device 1 by transferring the heat to the first case 100 and the second case 200. For the accommodating space near the first casing 100 and the second casing 200, the heat dissipation of the electrode assembly and the electrolyte therein is relatively fast; the heat dissipation of the electrode assembly and the electrolyte in the accommodating space near the middle is relatively slow. Specifically, on the one hand, the heat of the electrode assembly and the electrolyte in the accommodating space near the middle is transferred to the cavity surface of the first case 100 and the second case 200 in a longer path, so the temperature is higher; on the other hand, the heat generated by the electrode assemblies close to the two sides of the middle accommodating space is also transferred to the electrode assemblies, so that the temperature of the electrode assemblies is higher as a whole. The above factors combine to make it more difficult for the electrochemical device 1 to dissipate heat outward at a position closer to the center in the thickness direction X, that is, at a middle position of the electrochemical device 1; the high temperature of the central area may cause the electrochemical device 1 to have a high risk, such as a reduction in the lifespan of the electrochemical device 1 or a safety accident caused by thermal runaway of the electrochemical device 1.
In order to reduce the above risk, the electrochemical device 1 provided in the present embodiment is configured such that the thermal conductivity λ of the first separator 3001Greater than the thermal conductivity lambda of the second separator 4002. Since the first body portion 310 is closer to the first plane M than the second body portion 410, the first separator 300 is closer to the middle of the electrochemical device 1 in the thickness direction X than the second separator 400. By setting (lambda)1>λ2) So that: compared to the second separator 400, the first separator 300 can transfer heat to the first and second peripheral portions 120 and 220 more quickly, and further dissipate heat to the outside more quickly, so as to reduce the accumulation of heat in the first accommodating space 101, and improve the defect that the heat inside the electrochemical device 1 is difficult to dissipate.
Referring to fig. 7 and 9, in the present embodiment, the first spacer 300 includes a first substrate layer 340; the first substrate layer 340 is used to block ions on both sides from passing through, i.e. prevent ions on one side from flowing to the other side. The second separator 400 includes a second substrate layer 440; the second substrate layer 440 is also used to block ions from passing through its two sides, i.e. to prevent ions on one side from flowing to the other side. The first substrate layer 340 has a thermal conductivity λ11The thermal conductivity of the second substrate layer is lambda21(ii) a The electrochemical device 1 satisfies: lambda [ alpha ]11>λ21. For example, in some embodiments, the material of the first substrate layer 340 includes aluminum, and the thermal conductivity λ of the first substrate layer 34011Is 237 watt/(meter.K)); second radicalThe material of the material layer 440 includes polypropylene, the thermal conductivity λ of the second substrate layer 440 is11The ratio was 0.2W/(mK). Since the thermal conductivity of the first substrate layer 340 is greater than that of the second substrate layer 440, the first substrate layer 340 has a higher efficiency in transferring the heat inside the electrochemical device 1 to the first and second peripheral portions 120 and 220. It should be understood that even though the materials of the first substrate layer 340 and the second substrate layer 440 are selected as above in this embodiment, the application is not limited thereto, and the materials of the first substrate layer 340 and the second substrate layer 440 are various as long as the thermal conductivity of the first substrate layer 340 is ensured to be larger than that of the second substrate layer 440. In other embodiments of the present disclosure, the material of the first substrate layer 340 may further include other metal and/or carbon materials; for example, the metal may include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Sn, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Ge, Sb, Pb, In, Zn, or stainless steel, for example, the carbon material may include at least one of a carbon felt, a carbon film, carbon black, acetylene black, fullerene, a conductive graphite film, or a graphene film. Similarly, in other embodiments of the present disclosure, the second substrate layer 440 may further include other polymers; for example, the polymer may include polyetheretherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, 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, polyether nitrile, polyurethane, polyphenylene oxide, polyester, polysulfone, amorphous alpha-olefin copolymer, or derivatives thereof.
Further, the thermal conductivity λ of the first separator 3001Greater than the thermal conductivity lambda of the third separator 5003. Since the first body portion 310 is closer to the first plane M than the third body portion 510, the first separator 300 is closer to the electrochemical device 1 along the thickness direction X than the third separator 500 isAn intermediate position. The arrangement enables the first insulating member 300 to transfer heat to the first and second peripheral portions 120 and 220 more quickly than the third insulating member 500, so as to radiate heat to the outside more quickly, thereby reducing the accumulation of heat in the first accommodating space 101.
In this embodiment, the third separator 500 includes a third substrate layer, which is used to isolate the ions on two sides from passing through, i.e. prevent the ions on one side from flowing to the other side; the third substrate layer has a thermal conductivity of λ31. The electrochemical device 1 satisfies: lambda [ alpha ]11>λ31. For example, in some embodiments, the material of the first substrate layer 340 includes aluminum, and the thermal conductivity λ of the first substrate layer 340 is11237W/(m.K); the third substrate layer is made of polypropylene, and has heat conductivity lambda31Is 0.2W/(mK). It should be understood that the material of the third substrate layer is also various, and reference may be made to the material of the second separator; the third base material layer may be made of the same material as the second base material layer or different material from the second base material layer.
In order to prevent the first electrode assembly 600 and/or the second electrode assembly 700 from being short-circuited by the electrical connection between the first electrode assembly 600 and/or the second electrode assembly 700 and the first substrate layer 340, and to facilitate the encapsulation of the first separator 300, the first separator 300 further includes an insulating first encapsulation layer 350 and an insulating second encapsulation layer 360. Specifically, referring to fig. 7, the first package layer 350, the first substrate layer 340 and the second package layer 360 are stacked; along the thickness direction X, the first substrate layer 340 is located between the first package layer 350 and the second package layer 360. The first spacer 300 is connected to the second encapsulation part 430 through a first encapsulation layer 350, and the first spacer 300 is connected to the third encapsulation part 520 through a second encapsulation layer 360. Optionally, the materials of the first encapsulation layer 350 and the second encapsulation layer 360 include polymers, the first encapsulation layer 350 is thermally fused with the second encapsulation portion 430, and the second encapsulation layer 360 is thermally fused with the third encapsulation portion 520.
Similarly, with continued reference to fig. 9, the second spacer 400 further includes an insulating third packaging layer 450 and an insulating fourth packaging layer 460. The third package layer 450, the second substrate layer 440, and the fourth package layer 460 are stacked; along the thickness direction X, the second substrate layer 440 is located between the third encapsulation layer 450 and the fourth encapsulation layer 460. The second separator 400 is connected to the second peripheral portion 220 via a third sealing layer 450, and is connected to the first sealing portion 330 via a fourth sealing layer 460. Optionally, the material of the third encapsulating layer 450 and the fourth encapsulating layer 460 includes a polymer; the third sealing layer 450 is thermally fused to the second peripheral portion 220, and the fourth sealing layer 460 is thermally fused to the first sealing portion 330.
Similarly, the third spacer 500 includes a fifth insulating package layer, a third substrate layer, and a sixth insulating package layer. The fifth packaging layer, the third base material layer and the sixth packaging layer are arranged in a stacked mode; along the thickness direction X, the third base material layer is located between the fifth encapsulation layer and the sixth encapsulation layer. The third spacer is connected to the first sealing portion 330 through a fifth sealing layer, and is connected to the first peripheral portion 120 through a sixth sealing layer. Optionally, the material of the fifth encapsulating layer and the sixth encapsulating layer comprises a polymer; the fifth sealing layer is thermally fused to the second peripheral portion 220, and the sixth sealing layer is thermally fused to the first sealing portion 330. Preferably, the materials of the first encapsulating layer 350, the second encapsulating layer 360, the third encapsulating layer 450, the fourth encapsulating layer, the fifth encapsulating layer and the sixth encapsulating layer are the same as the materials of the first insulating material layer; this arrangement is intended to improve the packaging reliability of the thermal fusion connection of the first separator 300, the second separator 400, the third separator 500, the first case 100, and the second case 200 by similar fusion characteristics.
Next, the relationship between the thermal conductivity relative relationship of the first separator 300, the second separator 400, and the third separator 500 and the performance of the electrochemical device 1 will be described with reference to the experimental data in table one, taking a lithium ion battery as an example. In each of the examples and comparative examples shown in table one, the encapsulation layers of the first separator 300, the second separator 400, and the third separator 500 are made of the same material; i.e., each instanceThe materials and thicknesses of the first encapsulating layer, the second encapsulating layer, the third encapsulating layer, the fourth encapsulating layer, the fifth encapsulating layer and the sixth encapsulating layer in the examples and the comparative examples are the same, for example, polypropylene with a thickness of 20 micrometers is used in the experimental group, and all the encapsulating layers are only located at the encapsulating part of the isolator. The electrode assemblies were all prepared as follows: (1) preparing a negative pole piece: mixing the negative active material artificial graphite, conductive carbon black (Super P) and Styrene Butadiene Rubber (SBR) according to the weight ratio of 96:1.5:2.5, adding deionized water, blending into slurry with the solid content of 70wt%, and uniformly stirring. And uniformly coating the slurry on one surface of a negative current collector copper foil with the thickness of 10 mu m, and drying at 110 ℃ to obtain the negative pole piece with the coating thickness of 150 mu m and the single surface coated with the negative active material layer. And repeating the steps on the other surface of the copper foil of the negative current collector to obtain the negative pole piece with the negative active material layer coated on the two surfaces. Then, the negative electrode plate is cut into a size of 41mm × 61mm for standby. (2) Preparing a positive pole piece: the positive electrode active material lithium cobaltate (LiCoO)2) Mixing conductive carbon black (Super P) and polyvinylidene fluoride (PVDF) according to the weight ratio of 97.5:1.0:1.5, adding N-methylpyrrolidone (NMP), preparing slurry with the solid content of 75wt%, and uniformly stirring. And uniformly coating the slurry on one surface of an aluminum foil of the positive current collector with the thickness of 12 mu m, and drying at 90 ℃ to obtain the positive pole piece with the positive active material layer with the thickness of 100 mu m. And repeating the steps on the other surface of the aluminum foil of the positive current collector to obtain the positive pole piece with the positive active material layer coated on the two surfaces. Then, the positive pole piece is cut into 38mm × 58mm for standby. (3) Preparation of electrode assembly: the diaphragm, the double-sided coated negative pole piece, the diaphragm and the double-sided coated positive pole piece are sequentially stacked to form a lamination, and then four corners of the whole lamination structure are fixed for later use. Wherein each electrode assembly comprises a positive electrode tab and a negative electrode tab, and the separator is a Polyethylene (PE) film with the thickness of 15 μm. The electrolyte is prepared in the following way: in a dry argon atmosphere, organic solvents of Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and diethyl carbonate (DEC) are firstly mixed in a mass ratio of EC to EMC to DECMixing at a ratio of =30:50:20, and then adding lithium salt lithium hexafluorophosphate (LiPF) to the organic solvent6) Dissolving and mixing uniformly to obtain the electrolyte with the concentration of lithium salt of 1.15 mol/L. Meanwhile, the present application controls the material of the substrate layers of the first separator 300, the second separator 400, and the third separator 500 in each embodiment and the comparative example to be different, so that the thermal conductivity of the first separator 300, the second separator 400, and the third separator 500 is different; and then the relative relation between the two is obtained through experiments by the aid of the different heat conductivity and the different performance of the electrochemical device. Before describing the above relationships, in order to better understand the experimental data in table one, the following first describes the concepts related to table one, and more specifically, the following description.
The thermal conductivity test method comprises the following steps: in the embodiment of the application, a Hot Disk heat conduction analyzer is used for testing the heat conductivity of the isolating piece, a probe for testing is a continuous double-spiral-structure sheet formed by etching conductive metal nickel, and the outer layer is a double-layer Kapton (polyimide) protective layer. Wherein the thickness of the outer Kapton protective layer is only 0.025mm, which enables the probe to have certain mechanical strength and simultaneously maintains the electrical insulation between the probe and the sample. The probe is placed between the samples of the main body parts of the two isolating pieces to form a sandwich-like structure, the resistance of the probe is changed by the direct current with constant output on the probe due to the increase of temperature, so that the voltage generated at the two ends of the probe is reduced, and the heat flow information in the probe and the tested sample can be accurately obtained by recording the change of the voltage and the current in a period of time.
"Capacity conservation Rate 500 cycles" as used herein means the cell capacity C of the 500 th full charge of the electrochemical device after completion of its manufacture2Relative to the capacity C of the battery at first full discharge after manufacture1Percentage of (c). For example, if the first full discharge capacity of the electrochemical device 1 is 5000 milliampere (mAh), and the 500 th full discharge capacity of the electrochemical device 1 is 4000mAh during charge and discharge cycles, the "capacity retention rate after 500 cycles" of the electrochemical device 1 is 80%.
The "500-cycle expansion ratio" described in the present document means an increase percentage of the thickness dimension of the electrochemical device 1 in the 500 th full charge state after the completion of the manufacturing, in relation to the thickness dimension at the first full charge after the completion of the manufacturing. For example, if the thickness of the electrochemical device 1 at the initial full charge state is 5 millimeters (mm) and the thickness of the electrochemical device 1 at the 500 th full charge state of the charge-discharge cycle is 5.5mm, the "500 th cycle expansion ratio" of the electrochemical device 1 is 10%.
As can be seen from comparative examples 1 to 5, when the material of the second substrate layer 440 (and the third substrate layer) is a polymer, and the thermal conductivity of the first separator 300 is less than that of the second separator (the third separator), the capacity retention rate of the electrochemical device 1 is less than 75% after 500 cycles at 25 ℃, and the expansion rate is greater than 12%. It can be seen from examples 1 to 16 (for example, by combining example 1 with comparative example 1, and example 2 with comparative example 2), when the material of the second substrate layer (and the third substrate layer) is a polymer, and the thermal conductivity of the first separator 300 is greater than that of the second separator (the third separator), the capacity retention rate of the electrochemical device 1 after 500 cycles at 25 ℃ is greater than 75%, and the expansion rate is less than 9%. It can be seen that when the thermal conductivity λ of the first separator 300 is increased1>λ2In this case, the electrochemical device 1 has a higher capacity retention rate and a lower expansion rate, and the cycle life and safety thereof are more excellent. When the materials of the first substrate layer 340 and the second substrate layer 440 (and the third substrate layer) are all made of metal, the capacity retention rate of the electrochemical device 1 is higher than 85% after 500 cycles at 25 ℃, and the expansion rate is lower than 6.5%.
Optionally, the thermal conductivity λ of the first separator 3001And the thermal conductivity lambda of the second separator 4002Satisfies the following conditions: lambda [ alpha ]1≥30 W/（m·K），0.2 W/（m·K）≤λ2Less than or equal to 5W/(m.K). Referring to Table one, further alternatively, λ1≥60 W/（m·K），0.2 W/（m·K）≤λ2Less than or equal to 0.25W/(m.K); at this time, the first substrate layer 340 may be made of a metal material with a better thermal conductivity, and the second substrate layer 440 may be made of a polymer material with a general thermal conductivity and meeting the actual thermal conductivity requirement.
In some embodiments, the material of the first substrate layer 340 includes a metal, and the material of the second substrate layer 440 includes a polymer. From the above experimental results, when the first substrate layer 340 and the second substrate layer 440 are made of metal materials with high thermal conductivity, the capacity retention rate and the expansion rate of the electrochemical device 1 are maintained in a preferable range after 500 cycles at 25 ℃. However, when the metal is required to achieve the function of isolating ions in different accommodating spaces, the compactness thereof needs to be high, and this also requires that it has a large thickness, for example, greater than or equal to 30 μm, or even greater than 50 μm. If the first substrate layer 340 and the second substrate layer 440 are made of metal materials, on one hand, the thickness of the electrochemical device 1 is significantly increased, i.e., the energy density of the electrochemical device 1 is low, and on the other hand, the manufacturing cost is increased; meanwhile, when the electrochemical device 1 works in a low-temperature environment and the overall temperature is still low, the second substrate layer 440 includes a polymer, so that the heat generated inside can be prevented from being dissipated too fast, and the temperature inside the electrochemical device 1 can be rapidly raised to a suitable working temperature. From examples 1 to 16, it is found that the composition satisfies the condition of 0.2W/(mK). ltoreq.lambda2In examples 1 to 6 and 13 to 16 of 5W/(m · K) or less, the low-temperature cycle capacity retention ratio can be significantly improved, because the heat generated by the electrochemical device 1 itself can be better preserved by the second separator and the third separator on the outer side in a low-temperature environment, thereby improving the working temperature inside the electrochemical device 1. Therefore, compared with the first substrate layer 340 and the second substrate layer 440 which are made of metal materials; in this embodiment, the first substrate layer 340 includes a metal, and the second substrate layer 440 includes a polymer, so that the electrochemical device 1 can satisfy the heat dissipation requirement, and has a higher energy density, a lower manufacturing cost, and a better low-temperature performance.
The relationship between the thermal conductivity of the first separator, the thermal conductivity of the second separator, and the thermal conductivity of the third separator, and the performance of the electrochemical device 1 is shown
| A first substrate The material of the layer | Second base material Layer/third base The material of the material layer | A first substrate Thickness of the layer （μm） | Second base material Layer/third Of substrate layers Thickness (μm) | Guides for the first spacer Heat rate lambda 1 [ W/(m. K)] | Second spacer/third spacer Thermal conductivity lambda of the separator 2 [W/(m·K)] | Circulation at 25 ℃ Capacity of 500 times Retention rate （%） | Circulation at 25 DEG C 500 times of swelling Percentage (%) | Circulation at-10 ℃ for 500 times Amount holding ratio (%) | |
| Example 1 | Al | PP | 30 | 20 | 237 | 0.22 | 84 | 6.6 | 70 |
| Example 2 | Fe | PET | 30 | 20 | 80 | 0.2 | 82 | 6.8 | 71 |
| Example 3 | Sn | PET | 30 | 20 | 67 | 0.2 | 81 | 6.5 | 73 |
| Example 4 | Al | PEN | 30 | 20 | 237 | 0.21 | 85 | 6.2 | 71 |
| Example 5 | Al | PP | 30 | 20 | 237 | 0.22 | 83 | 6.7 | 72 |
| Example 6 | Al | Anhydride-modified poly(s) Propylene (PA) | 30 | 20 | 237 | 0.23 | 82 | 6.4 | 70 |
| Example 7 | Al | Sn | 30 | 20 | 237 | 67 | 88 | 6.3 | 53 |
| Example 8 | Al | Fe | 30 | 20 | 237 | 80 | 87 | 6.2 | 52 |
| Example 9 | Cu | Al | 30 | 20 | 401 | 237 | 89 | 6.1 | 50 |
| Example 10 | Cu | Fe | 30 | 20 | 401 | 80 | 88 | 6 | 51 |
| Example 11 | Cu | Sn | 30 | 20 | 401 | 67 | 87 | 6.2 | 54 |
| Example 12 | Al | Pb | 30 | 20 | 237 | 34.5 | 85 | 6 | 55 |
| Example 13 | MgO filling PPS (Filler) Amount 80%) | Modified polystyrene Alkene(s) | 30 | 20 | 3.4 | 0.25 | 79 | 8.6 | 72 |
| Example 14 | Graphite filling PC (filling material) Amount 30%) | Polyamide, process for producing the same and use thereof | 30 | 20 | 2.8 | 0.21 | 78 | 8.8 | 74 |
| Example 15 | Boron nitride filling Epoxy-filled tree Fat (filling material) Amount 60%) | Polyvinyl chloride | 30 | 20 | 3.9 | 0.15 | 80 | 8.4 | 71 |
| Example 16 | Al | Boron nitride filling Epoxy resin (filling quality) 70%） | 30 | 20 | 237 | 5 | 84 | 6.3 | 70 |
| Comparative example 1 | Polyamide | PP | 30 | 20 | 0.18 | 0.22 | 70 | 12 | 75 |
| Comparative example 2 | Polyamide | PET | 30 | 20 | 0.18 | 0.2 | 72 | 12.3 | 76 |
| Comparative example 3 | Polyamide | PEN | 30 | 20 | 0.18 | 0.21 | 70 | 12.6 | 74 |
| Comparative example 4 | PP | Anhydride-modified poly(s) Propylene (PA) | 30 | 20 | 0.2 | 0.23 | 73 | 12.3 | 73 |
| Comparative example 5 | Polyvinyl chloride | Polyamide | 30 | 20 | 0.15 | 0.18 | 73 | 12.6 | 75 |
It should be added that, even though the electrochemical device 1 includes the third separator 500 and the fourth electrode assembly 900 in the embodiment, the present application is not limited thereto, and the present application may be adapted based on the above. For example, in other embodiments of the present application, the electrochemical device 1 may not include the third separator 500 and the fourth electrode assembly 900. At this time, the electrochemical device 1 still has the first accommodating space 101 between the first casing 100 and the first separator 300, the second accommodating space 102 between the first separator 300 and the second separator 400, and the third accommodating space 103 between the second separator 400 and the second casing 200; accordingly, the first electrode assembly 600 is still located in the first receiving space 101, the second electrode assembly 700 is still located in the second receiving space 102, and the third electrode assembly 800 is still located in the third receiving space 103. The first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800 are connected in series; of course, in other embodiments, the first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800 may be connected in parallel or in series.
For another example, in other embodiments of the present application, the electrochemical device 1 includes a plurality of third separators 500 and a plurality of fourth electrode assemblies 900. At this time, the third spacers 500 are sequentially disposed between the first spacer 300 and the first case 100 along the thickness direction, and a fourth electrode assembly 900 is disposed on one side of each third spacer 500 facing the first case 100. Preferably, the thermal conductivity between the first separator 300 and each of the third separators 500 is sequentially decreased in a direction in which the first separator 300 is directed toward the first casing 100. This arrangement allows the third separator 500 closer to the first separator 300 to have a higher thermal conductivity, which makes it easier to dissipate heat near the middle of the electrochemical device 1, thereby making the temperature of the electrochemical device 1 uniform throughout the use thereof.
In summary, the electrochemical device 1 provided in the embodiment of the present application includes the first case 100, the second case 200, the first separator 300, the second separator 400, the first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800. Wherein, the first casing 100 and the second casing 200 together enclose the housing of the electrochemical device 1. The first separator 300 and the second separator 400 are sequentially disposed between the first casing 100 and the second casing 200, so that the electrochemical device has the first accommodating space 101, the second accommodating space 102, and the third accommodating space 103. The first electrode assembly 600, the second electrode assembly 700, and the third electrode assembly 800 are sequentially disposed in the first accommodating space 101, the second accommodating space 102, the third accommodating space 103, and the fourth accommodating space 104.
By bringing the first main body portion 310 in the first separator 300 closer to the first plane M than the second main body portion in the second separator 400, and the thermal conductivity λ of the first separator 3001Greater than the thermal conductivity lambda of the second separator 4002. This arrangement enables the first separator 300 to transfer heat to the first peripheral portion 120 and the second peripheral portion 220 more rapidly than the second separator 400, so as to alleviate or avoid the risk of over-temperature in the central region of the electrochemical device 1, thereby improving the cycle life and safety of the electrochemical device 1.
Based on the same inventive concept, another embodiment of the present application further provides an electronic device 2, and specifically, referring to fig. 10, which shows a schematic view of the electronic device 2, and referring to fig. 1 to 9, the electronic device 2 includes the electrochemical device 1 described in any of the embodiments above. In this embodiment, the electronic device is a mobile phone; it can be understood that, in other embodiments of the present application, the electronic device may also be any other electronic device such as a tablet, a computer, an unmanned aerial vehicle, a remote controller, an electric vehicle, and the like.
Due to the electrochemical device, the electronic device 2 can also improve the current situation that a plurality of electrochemical device units are required to be combined to increase the output power, thereby resulting in lower energy density of the whole module.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments may also be combined, the steps may be implemented in any order and there are many other variations of the different aspects of the present application described above which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An electrochemical device, comprising:
a first housing;
a second case disposed opposite to the first case in a thickness direction of the electrochemical device;
a first spacer;
the first separator is positioned between the first shell and the second separator, the second separator is positioned between the first separator and the second shell, a first accommodating space is arranged between the first shell and the first separator of the electrochemical device, a second accommodating space is arranged between the first separator and the second separator of the electrochemical device, and a third accommodating space is arranged between the second separator and the second shell of the electrochemical device;
the first electrode assembly is arranged in the first accommodating space;
the second electrode assembly is arranged in the second accommodating space; and
the third electrode assembly is arranged in the third accommodating space;
the first separator includes a first body portion between the first electrode assembly and the second electrode assembly, the second separator includes a second body portion between the second electrode assembly and the third electrode assembly, a distance between the first body portion and a first plane is smaller than a distance between the second body portion and the first plane, and satisfies: the thermal conductivity of the first separator is greater than the thermal conductivity of the second separator;
wherein, along the thickness direction of the electrochemical device, the electrochemical device is provided with a first surface and a second surface which are opposite, the first plane is vertical to the thickness direction of the electrochemical device, and the distances from the first plane to the first surface and the second surface are equal.
2. The electrochemical device of claim 1, further comprising at least one third separator between said first housing and said first separator;
the thermal conductivity of the first separator and each of the third separators decreases in order in a direction in which the first separator is directed toward the first housing.
3. The electrochemical device according to claim 1, wherein the thermal conductivity of the first separator is λ1The thermal conductivity of the second separator is lambda2And at least one of the following conditions is satisfied:
（a）λ1≥30 W/（m·K）；
（b）0.2 W/（m·K）≤λ2≤5 W/（m·K）。
4. the electrochemical device according to claim 1, wherein the first separator includes a first substrate layer having a thermal conductivity λ11；
The second isolating piece comprises a second base material layer, and the thermal conductivity of the second base material layer is lambda21，λ11>λ21。
5. The electrochemical device according to claim 4, wherein at least one of the following conditions is satisfied:
(c) the first isolator further comprises an insulating first packaging layer and an insulating second packaging layer; the first substrate layer is positioned between the first packaging layer and the second packaging layer;
(d) the second isolating piece further comprises an insulated third packaging layer and an insulated fourth packaging layer, and the second base material layer is located between the third packaging layer and the fourth packaging layer.
6. The electrochemical device according to claim 4, wherein at least one of the following conditions is satisfied:
(e) the material of the first base material layer comprises at least one of metal or carbon material;
(f) the material of the second base material layer comprises a polymer.
7. The electrochemical device according to claim 6,
the metal comprises at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Sn, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Ge, Sb, Pb, In, Zn or stainless steel;
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 polymer includes polyetheretherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, 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 derivatives thereof.
8. The electrochemical device as claimed in claim 1, wherein the first casing includes a first cavity portion recessed toward a side facing away from the second casing to form a cavity, and a first peripheral portion surrounding the first cavity portion;
the second housing includes a second cavity portion opposite the first cavity portion and a second peripheral portion opposite the first peripheral portion;
the first isolator includes a first encapsulant portion disposed around the first body portion, the second isolator includes a second encapsulant portion disposed around the second body portion, the first encapsulant portion is positioned between the first peripheral portion and the second encapsulant portion, and the second encapsulant portion is positioned between the first encapsulant portion and the second peripheral portion.
9. The electrochemical device of claim 1, wherein the first electrode assembly, the second electrode assembly, and the third electrode assembly are connected in series, parallel, or series-parallel.
10. An electronic device comprising the electrochemical device according to any one of claims 1 to 9.
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