CN221041206U - Lithium ion battery and power utilization device - Google Patents
Lithium ion battery and power utilization device Download PDFInfo
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- CN221041206U CN221041206U CN202322713707.4U CN202322713707U CN221041206U CN 221041206 U CN221041206 U CN 221041206U CN 202322713707 U CN202322713707 U CN 202322713707U CN 221041206 U CN221041206 U CN 221041206U
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- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 54
- 238000004804 winding Methods 0.000 claims abstract description 54
- 239000011810 insulating material Substances 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012774 insulation material Substances 0.000 claims abstract description 3
- 230000001681 protective effect Effects 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011231 conductive filler Substances 0.000 claims description 2
- 239000000499 gel Substances 0.000 claims description 2
- 238000004382 potting Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000014759 maintenance of location Effects 0.000 abstract description 5
- 239000012528 membrane Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Secondary Cells (AREA)
Abstract
The application relates to a lithium ion battery and an electric device. The lithium ion battery comprises a shell and a battery cell arranged in the shell; wherein the battery core comprises at least two winding cores; a winding core clamping film is arranged between two adjacent winding cores; the projection area of the winding core clamping film on one surface of the winding core is smaller than the area of the surface; a heat conduction and insulation structure is arranged between the battery cell and the shell, and the heat conduction and insulation structure is contacted with the side wall of the shell; the material of the winding core clamping film and the heat conduction and insulation structure is heat conduction and insulation material. Through setting up the core double-layered membrane between adjacent book core, set up heat conduction insulation structure between electric core and casing, and the material of core double-layered membrane and heat conduction insulation structure is heat conduction insulating material, and the inside quick heat exchange that can realize of lithium ion battery avoids local heat accumulation, promotes lithium ion battery's electrochemical performance, and lithium ion battery heats up less in cyclic process, and the circulation capacity retention is higher.
Description
Technical Field
The application relates to the technical field of secondary batteries, in particular to a lithium ion battery and an electric device.
Background
The lithium ion battery is used as a novel efficient green energy source and is widely applied to aspects of 3C consumer products, electric automobiles, energy storage systems and the like in recent years. The lithium ion battery technology is developed at a high speed and simultaneously provides special requirements for the working environment, such as long service life at high temperature, but heat is generated in the charge and discharge process, and the battery is more easily short-circuited in the battery due to the external high-temperature environment, so that risks such as explosion and fire can be caused.
Under the high temperature condition, transition metal ions of the positive electrode material in the lithium ion battery are dissolved out, so that the generation of interface side reactions can be catalyzed, and the active lithium is deposited on the surfaces of the positive electrode and the negative electrode, so that the performance of the lithium ion battery is rapidly deteriorated; heat is generated in the charging and discharging process, and the temperature of the internal area of the battery core is far higher than the ambient temperature due to the fact that energy cannot be exchanged in time, so that the formation of lithium dendrite is caused by the imbalance of local temperature, internal short circuit is caused, and the safety risks such as capacity loss, explosion and ignition are caused; in addition, when the fully charged lithium ion battery is stored at a high temperature, irreversible capacity loss is caused, and the battery dynamics is improved mainly under the influence of temperature, so that lithium ions can be accelerated to diffuse to a overhang area and the electrolyte and impurities react slightly, and active lithium loss is caused.
Disclosure of utility model
Based on the method, the lithium ion battery with less cyclic temperature rise and better cyclic stability is provided.
In addition, an electric device comprising the lithium ion battery is also provided.
In one aspect, the application provides a lithium ion battery, which comprises a shell and a battery cell arranged in the shell;
wherein the battery core comprises at least two winding cores; a winding core clamping film is arranged between two adjacent winding cores; the projection area of the winding core clamping film on the surface opposite to the winding core is smaller than the area of the surface;
A heat conduction and insulation structure is arranged between the battery cell and the shell, and the heat conduction and insulation structure is contacted with the side wall of the shell;
The material of the winding core clamping film and the heat conduction and insulation structure is heat conduction and insulation material.
In some embodiments, the heat-conducting insulating material is selected from one of an inorganic heat-conducting material, a heat-conducting resin, a heat-conducting silica gel, a heat-conducting pouring sealant, a heat-conducting filling glue, a heat-conducting mud and a heat-conducting adhesive;
optionally, the heat conductive insulating material is heat conductive silica gel.
In some embodiments, the thickness of the core sandwich is 0.01mm to 1mm, optionally 0.05mm to 0.15mm.
In some embodiments, the surface of the winding core opposite to the winding core clamping film is square, and on the surface, the width X1 of the winding core clamping film and the width X2 of the winding core meet the following conditions: x1 is less than X2; the height Y1 of the roll core film and the height Y2 of the roll core satisfy the following conditions: y1 < Y2.
In some embodiments, 0 < X2-X1.ltoreq.3 mm; Y2-Y1 is more than 0 and less than or equal to 3mm.
In some embodiments, the heat conducting and insulating structure comprises a protective film and a bottom plate;
the protective film is in contact with the side wall of the shell; the bottom plate is in contact with the bottom of the housing.
In some embodiments, the protective film has a thickness of 0.01mm to 1mm, optionally 0.05mm to 0.15mm.
In some embodiments, a surface of the winding core opposite to the protective film is square, and on the surface, a width X3 of the protective film and a width X2 of the winding core satisfy: x3 > X2; the height Y3 of the protective film and the height Y2 of the winding core satisfy the following conditions: y3 > Y2;
Optionally, 0 < X3-X2 is less than or equal to 3mm;
optionally, 0 < Y3-Y2 is less than or equal to 3mm.
In some embodiments, the lithium ion battery further comprises a top cap; the top cover covers the opening of the shell.
In a second aspect, the present application also provides an electric device, including the lithium ion battery of the first aspect.
According to the lithium ion battery provided by the embodiment of the application, the winding core clamping film is arranged between the adjacent winding cores, the heat conduction insulating structure is arranged between the battery core and the shell, and the winding core clamping film and the heat conduction insulating structure are made of heat conduction insulating materials, so that the winding core in the lithium ion battery can realize rapid heat exchange, and the safety risk caused by local heat accumulation is avoided, thereby improving the electrochemical performance of the lithium ion battery, the temperature rise of the lithium ion battery in the circulation process is less, and the circulation capacity retention rate is higher.
Drawings
Fig. 1 is an exploded view of a lithium ion battery according to an embodiment of the present application;
reference numerals illustrate:
1. A top cover; 2. a winding core; 3. winding a core and clamping a film; 4. a protective film; 5. a bottom support plate; 6. a housing.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
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 intervening elements may also be present. 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 also be present.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Furthermore, the figures are not to be taken as 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings to facilitate an understanding of the application, and are not necessarily drawn to true scale, the proportions in the drawings not being limiting to the application.
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 herein in the description of the application 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 herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, in an embodiment of the present application, a lithium ion battery is provided, which includes a housing 6 and a battery cell (not shown) disposed in the housing 6.
The housing 6 is used for accommodating the battery cell, the electrolyte and other components. The housing 6 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 6 may be determined according to the specific shape and size of the battery cell. The material of the housing 6 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, the housing 6 is an aluminum housing, which has good heat conducting properties.
The cell is the component of the lithium ion battery where electrochemical reactions occur. In the embodiment of the application, the battery cell comprises at least two winding cores 2. It will be appreciated that the winding core 2 is mainly formed by winding a positive electrode sheet and a negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet.
In the embodiment of the application, a winding core clamping film 3 is arranged between two adjacent winding cores 2. The projected area of the core sandwich 3 on the surface opposite to the core 2 is smaller than the area of the surface of the core 2. In this way, the space occupied by the core sandwich 3 in the case 6 is small, and the capacity of the electrolyte in the case 6 is not reduced.
A heat conducting and insulating structure (not shown) is arranged between the battery core and the housing 6, and the heat conducting and insulating structure is in contact with the side wall of the housing 6, so that heat in the battery core can be dissipated through the housing 6.
The materials of the winding core clamping film 3 and the heat conduction insulating structure are heat conduction insulating materials. Compared with a PP insulating coating film adopted in a traditional lithium ion battery, the heat-conducting insulating material not only has insulativity, but also has better heat-conducting property, and can realize rapid heat dissipation.
According to the lithium ion battery, the coil core clamping film 3 is arranged between the adjacent coil cores 2, the heat conducting and insulating structure is arranged between the battery core and the shell 6, and the coil core clamping film 3 and the heat conducting and insulating structure are made of heat conducting and insulating materials, so that the coil cores 2 in the lithium ion battery can realize rapid heat exchange, the safety risk caused by local heat accumulation is avoided, the electrochemical performance of the lithium ion battery is improved, the temperature of the lithium ion battery is low in the circulation process, and the circulation capacity retention rate is high.
In some embodiments, the thermally conductive insulating material is selected from one of an inorganic thermally conductive material, a thermally conductive resin, a thermally conductive silicone, a thermally conductive gel, a thermally conductive potting adhesive, a thermally conductive filler adhesive, a thermally conductive paste, and a thermally conductive adhesive. Optionally, the inorganic thermally conductive material comprises one of diamond, boron nitride, aluminum oxide, silicon nitride, and silicon oxide.
In some embodiments, the thermally conductive insulating material is thermally conductive silicone.
In some of these embodiments, the thickness of the core sandwich 3 is 0.01mm to 1mm. Alternatively, the thickness of the core sandwich 3 is in the range of 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.4mm, 0.5mm, 0.8mm, 1mm or any number of the above. Further, the thickness of the core sandwich 3 is 0.05 mm-0.15 mm.
In some of these embodiments, the surface of the winding core 2 opposite to the winding core film 3 is square, and on the surface, the width X1 of the winding core film 3 and the width X2 of the winding core 2 satisfy: x1 is less than X2; the height Y1 of the roll core clamping film 3 and the height Y2 of the roll core 2 satisfy the following conditions: y1 < Y2. The width and the height of the core sandwich membrane 3 are smaller than those of the core 2, so that the space occupied by the core sandwich membrane 3 in the shell 6 is smaller, and the capacity of electrolyte in the shell 6 is not reduced.
In some embodiments, 0 < X2-X1.ltoreq.3 mm. Alternatively, the value of X2-X1 is in the range of 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any number above.
In some embodiments, 0 < Y2-Y1.ltoreq.3 mm. Alternatively, the value of Y2-Y1 is in the range of 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any number above.
In some of these embodiments, the thermally conductive and insulating structure includes a protective film 4 and a bottom plate 5. The protective film 4 is in contact with the side wall of the housing 6, and the bottom plate 5 is in contact with the bottom of the housing 6.
In some of these embodiments, the protective film 4 has a thickness of 0.01mm to 1mm. Alternatively, the thickness of the protective film 4 is in the range of 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.4mm, 0.5mm, 0.8mm, 1mm, or any of the above numerical values. Further, the thickness of the protective film 4 is 0.05mm to 0.15mm.
In some of these embodiments, the surface of the winding core 2 opposite to the protective film 4 is square, and on the surface, the width X3 of the protective film 4 and the width X2 of the winding core 2 satisfy: x3 > X2; the height Y3 of the protective film 4 and the height Y2 of the winding core 2 satisfy: y3 > Y2. Thus, the area of the protective film 4 is larger than that of the winding core 2, and the protective film 4 can better avoid the direct contact between the winding core 2 and the shell 6.
In some embodiments, 0 < X3-X2.ltoreq.3 mm. Alternatively, the value of X3-X2 is in the range of 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any number above.
In some embodiments, 0 < Y3-Y2.ltoreq.3 mm. Alternatively, the value of Y3-Y2 is in the range of 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any number above.
In some of these embodiments, the lithium ion battery further comprises a top cover 1. The top cover 1 covers the opening of the shell 6 to isolate the internal environment of the lithium ion battery from the external environment. Without limitation, the shape of the top cover 1 may be adapted to the shape of the housing 6 to fit the housing 6. Optionally, the top cover 1 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the top cover 1 is not easy to deform when being extruded and collided, so that the lithium ion battery can have higher structural strength, and the safety performance can be improved. The material of the top cover 1 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.
In a second aspect, the present application also provides an electric device, including the lithium ion battery of the first aspect. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.
The following are specific examples.
Example 1
The present embodiment provides a lithium ion battery, and the structure of the lithium ion battery is shown in fig. 1. The lithium ion battery comprises a top cover 1, a shell 6 and an electric core.
The shell 6 is a square aluminum shell.
The cell comprises two winding cores 2. A roll core clamping film 3 is arranged between the two roll cores 2, and the roll core clamping film 3 is made of heat-conducting silica gel. And adopt heat conduction silica gel as protection film 4 cladding two to roll up core 2, the square aluminum hull is put into to the electric core that wraps up, still is provided with collet 5 between electric core and the casing 6 bottom, and the material of collet 5 is heat conduction silica gel. The 75Ah lithium ion battery is manufactured through the procedures of baking, liquid injection, formation, capacity and the like.
Comparative example 1
The comparative example provides a lithium ion battery, which is different from example 1 in that a core clamping film is not arranged between two cores, and the materials of the protective film and the bottom support plate are polypropylene PP.
5 Lithium ion batteries prepared in example 1 and comparative example 1 are respectively subjected to electrochemical performance test, a high-low temperature box of a tin-free Parten technology Co., ltd is adopted as an external constant temperature environment, and a blue electric battery tester of a Wuhan Jino electronic Co., ltd is adopted to carry out capacity and 55 ℃ cycle test; the test method is as follows:
1. And (3) testing the capacity of the lithium ion battery: and regulating the high-low temperature box to 25 ℃, standing for a certain time, and then carrying out 4 times of charge and discharge between the voltage range of 2.5-3.65V at the rate of 0.5C, wherein the average value of the discharge capacity of the three times is taken as the actual capacity value.
2. And (3) 55 ℃ cycle test: regulating the temperature of the high and low temperature to 55 ℃, standing for a certain time, charging and discharging in a voltage range of 2.5-3.65V at a rate of 0.5C, standing for 30min after charging/discharging, and pasting a temperature sensing wire at the center of a large surface outside the battery core for temperature real-time monitoring and collecting (10 points are collected per second) so as to obtain the temperature rise of charging/discharging in the circulation process and the test of the stabilization time after the charging/discharging is stopped. Capacity retention = discharge capacity of number of cycles/cycle initial discharge capacity.
TABLE 1
As can be seen from the data of table 1, the capacity retention rate of the lithium ion battery of example 1 at a rate of 1C at 55 ℃ for 500 weeks is significantly higher than that of comparative example 1, and the temperature rise during charge and discharge of the lithium ion battery of example 1 is smaller, and the temperature stabilization time is shorter.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present utility model, which facilitate a specific and detailed understanding of the technical solutions of the present utility model, but are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. It should be understood that, based on the technical solutions provided by the present utility model, those skilled in the art obtain technical solutions through logical analysis, reasoning or limited experiments, all of which are within the scope of protection of the appended claims. The scope of the patent is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted as illustrative of the contents of the claims.
Claims (10)
1. The lithium ion battery is characterized by comprising a shell and a battery cell arranged in the shell;
wherein the battery core comprises at least two winding cores; a winding core clamping film is arranged between two adjacent winding cores; the projection area of the winding core clamping film on the surface opposite to the winding core is smaller than the area of the surface;
A heat conduction and insulation structure is arranged between the battery cell and the shell, and the heat conduction and insulation structure is contacted with the side wall of the shell;
The material of the winding core clamping film and the heat conduction and insulation structure is heat conduction and insulation material.
2. The lithium ion battery of claim 1, wherein the thermally conductive insulating material is selected from one of an inorganic thermally conductive material, a thermally conductive resin, a thermally conductive silicone, a thermally conductive gel, a thermally conductive potting adhesive, a thermally conductive filler adhesive, a thermally conductive mud, and a thermally conductive adhesive;
optionally, the heat conductive insulating material is heat conductive silica gel.
3. The lithium ion battery of claim 1, wherein the thickness of the core sandwich is 0.01mm to 1mm, optionally 0.05mm to 0.15mm.
4. The lithium ion battery of claim 1, wherein a surface of the winding core opposite to the winding core clamping film is square, and on the surface, a width X1 of the winding core clamping film and a width X2 of the winding core satisfy: x1 is less than X2; the height Y1 of the roll core film and the height Y2 of the roll core satisfy the following conditions: y1 < Y2.
5. The lithium ion battery of claim 4, wherein 0 < X2-X1 is less than or equal to 3mm; Y2-Y1 is more than 0 and less than or equal to 3mm.
6. The lithium ion battery of claim 1, wherein the thermally conductive insulating structure comprises a protective film and a bottom plate;
the protective film is in contact with the side wall of the shell; the bottom plate is in contact with the bottom of the housing.
7. The lithium ion battery of claim 6, wherein the protective film has a thickness of 0.01mm to 1mm, optionally 0.05mm to 0.15mm.
8. The lithium ion battery according to claim 6, wherein a surface of the winding core opposite to the protective film is square, and on the surface, a width X3 of the protective film and a width X2 of the winding core satisfy: x3 > X2; the height Y3 of the protective film and the height Y2 of the winding core satisfy the following conditions: y3 > Y2;
Optionally, 0 < X3-X2 is less than or equal to 3mm;
optionally, 0 < Y3-Y2 is less than or equal to 3mm.
9. The lithium ion battery of claim 1, further comprising a top cap; the top cover covers the opening of the shell.
10. An electrical device comprising a lithium ion battery as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322713707.4U CN221041206U (en) | 2023-10-10 | 2023-10-10 | Lithium ion battery and power utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322713707.4U CN221041206U (en) | 2023-10-10 | 2023-10-10 | Lithium ion battery and power utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221041206U true CN221041206U (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322713707.4U Active CN221041206U (en) | 2023-10-10 | 2023-10-10 | Lithium ion battery and power utilization device |
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| CN (1) | CN221041206U (en) |
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