Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment. The battery comprises a first stack core and a second stack core which are stacked, and the second stack core is smaller than the first stack core to form a step shape. The first stack core comprises a plurality of first positive plates, a plurality of first negative plates and a plurality of first diaphragms, the plurality of first positive plates and the plurality of first negative plates are alternately stacked, and the plurality of first diaphragms are respectively positioned between the adjacent first positive plates and first negative plates; the second stack core comprises a plurality of second positive plates, a plurality of second negative plates and a plurality of second diaphragms, the plurality of second positive plates and the plurality of second negative plates are alternately stacked, and the plurality of second diaphragms are respectively positioned between the adjacent second positive plates and second negative plates. And the second positive plate positioned on the outermost side of the second laminated core is laminated on the first positive plate positioned on the outermost side of the first laminated core, so that the problem that the aluminum plastic film is damaged due to the fact that the negative plate is easy to react with the aluminum plastic film is solved, and the safety and reliability of the battery are improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and particularly to a battery and an electronic device. Background Art

[0002] With the continuous improvement of the technological level, people are becoming more and more dependent on electronic devices. Electronic devices can meet different needs in users' daily life, such as daily life entertainment, business office, payment, etc., improving the usage rate of electronic devices. Among them, the battery is one of the important components of electronic devices, which can supply power to the electronic device to ensure its normal use. When the existing battery is in use, the phenomenon of plastic film breakage caused by chemical reactions easily occurs, affecting the safety and reliability of the battery. Utility Model Content

[0003] This application provides a battery and an electronic device that can improve safety and reliability.

[0004] This application provides a battery, which includes a first stacked core and a second stacked core arranged in an overlapping manner. A stepped shape is formed between the second stacked core and the first stacked core. The first stacked core includes a plurality of first positive plates, a plurality of first negative plates, and a plurality of first separators. The plurality of first positive plates and the plurality of first negative plates are stacked alternately, and the plurality of first separators are respectively located between adjacent first positive plates and first negative plates. The second stacked core includes a plurality of second positive plates, a plurality of second negative plates, and a plurality of second separators. The plurality of second positive plates and the plurality of second negative plates are stacked alternately, and the plurality of second separators are respectively located between adjacent second positive plates and second negative plates. One second positive plate located on the outermost side of the second stacked core is stacked on one first positive plate located on the outermost side of the first stacked core.

[0005] Further, the battery includes an adhesive layer for adhesively fixing the first positive plate and the second positive plate.

[0006] Further, the area of one side of the second negative plate is larger than the area of one side of the second positive plate, and the area of the adhesive layer is larger than the area of one side of the second negative plate.

[0007] Further, the first positive plate located on the outermost side of the first stacked core includes a top surface facing the second positive plate, and an insulating layer is provided on the top surface to prevent the second negative plate from conducting with the first positive plate.

[0008] Further, the first positive plate located on the outermost side of the first stacked core is provided with a positive electrode material on one side; and / or, the second positive plate located on the outermost side of the second stacked core is provided with a positive electrode material on one side.

[0009] Further, the two outermost ones of the first stacked core are both first positive plates.

[0010] Further, the two outermost ones of the second stacked core are both second positive plates.

[0011] Further, the first stacked core and the second stacked core are separately and independently arranged, and the second stacked core is placed on the first stacked core.

[0012] Further, the battery includes an aluminum-plastic film surrounding the outside of the first stacked core and the second stacked core.

[0013] An embodiment of the present application also provides an electronic device including the above battery.

[0014] One second positive plate located at the outermost side of the second stacked core of the battery in the embodiment of the present application is stacked on one first positive plate located at the outermost side of the first stacked core, solving the problem that the negative plate easily reacts with the aluminum-plastic film to cause damage to the aluminum-plastic film, and improving the safety and reliability of the battery. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the battery in the embodiment of the present application;

[0016] Figure 2 is Figure 1 a schematic diagram of the first stacked core shown;

[0017] Figure 3 is Figure 2 a schematic diagram of the second stacked core shown. Detailed Embodiments

[0018] Here, the technical solutions in the embodiments (or "embodiment modes") of the present application will be clearly and completely described in conjunction with the drawings. When the following description involves the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0019] If there are terms related to directional indication or positional relationship in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), then such terms are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings); if this specific posture changes, then the directional indication or positional relationship also changes accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0020] See Figures 1 to 3, embodiments of the present application provide a battery 100, which includes a first stacked core 1 and a second stacked core 2 arranged in a stacked manner. A stepped shape is formed between the second stacked core 2 and the first stacked core 1. When the battery 100 is applied to an electronic device, the space utilization rate of the electronic device can be improved, and the capacity of the battery 100 can be increased without changing the space of the electronic device.

[0021] The first stacked core 1 includes a plurality of first positive plates 11, a plurality of first negative plates 12, and a plurality of first separators 13. The plurality of first positive plates 11 and the plurality of first negative plates 12 are alternately stacked, and the plurality of first separators 13 are respectively located between adjacent first positive plates 11 and first negative plates 12.

[0022] The second stacked core 2 includes a plurality of second positive plates 21, a plurality of second negative plates 22, and a plurality of second separators 23. The plurality of second positive plates 21 and the plurality of second negative plates 22 are alternately stacked, and the plurality of second separators 23 are respectively located between adjacent second positive plates 21 and second negative plates 22.

[0023] The second positive plate 21 located on the outermost side of the second stacked core 2 is stacked on the first positive plate 11 located on the outermost side of the first stacked core 1, which solves the problem that the first negative plate 12 is likely to react with the aluminum plastic film and cause damage to the aluminum plastic film, and improves the safety and reliability of the battery.

[0024] In some embodiments, the performance of the first separator 13 and the second separator 23 determines the interface structure, internal resistance, etc. of the battery, directly affecting characteristics such as the capacity, cycle life, and safety performance of the battery. A separator with excellent performance plays an important role in improving the comprehensive performance of the battery.

[0025] The single-sided area of the first positive plate 11 is larger than the single-sided areas of the second positive plate 21 and the second negative plate 22.

[0026] In some embodiments, the single-sided area of the first negative plate 12 is larger than the single-sided area of the first positive plate 11.

[0027] The main function of the first separator 13 is to separate the first positive plate 11 and the first negative plate 12 to prevent them from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0028] The main function of the second separator 23 is to separate the second positive plate 21 and the second negative plate 22 to prevent them from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0029] The materials of the first separator 13 and the second separator 23 are non-conductive, and their physical and chemical properties have a great impact on the performance of the battery 100.

[0030] For different types of the battery 100, different first separators 13 and second separators 23 are adopted. For the lithium battery series, since the electrolyte is an organic solvent system, a separator material resistant to organic solvents is required, and generally a high-strength thinned polyolefin porous membrane is used.

[0031] In some embodiments, the first separator 13 and the second separator 23 are mainly polyolefin separators based on polyethylene (PE) and polypropylene (PP). Among them, PE products are mainly prepared by the wet process, and PP products are mainly prepared by the dry process.

[0032] In some embodiments, the battery 100 includes an adhesive layer 3 to adhesively fix the first positive electrode plate 11 and the second positive electrode plate 21, avoiding the problem of misalignment and movement of the second stacked core 2 during reliability tests such as dropping / drum rolling, and improving its own reliability.

[0033] In some embodiments, the adhesive layer 3 can be a hot melt adhesive or a double-sided adhesive, etc.

[0034] In some embodiments, the area of one side of the second negative electrode plate 22 is larger than the area of one side of the second positive electrode plate 21, and the area of the adhesive layer 3 is larger than the area of one side of the second negative electrode plate 22, which can avoid safety problems such as the battery bulging and burning caused by the deformation of the second negative electrode plate 22 and short circuit with the first positive electrode plate 11.

[0035] In some embodiments, the first positive electrode plate 11 located on the outermost side of the first stacked core 1 includes a top surface 111 facing the second positive electrode plate 21, and an insulating layer (not shown) is provided on the top surface 111 to prevent the second negative electrode plate 22 from conducting with the first positive electrode plate 11, which can avoid safety problems such as the battery 100 bulging and burning caused by the deformation of the second negative electrode plate 22 and short circuit with the first positive electrode plate 11.

[0036] In some embodiments, the area of the insulating layer can be equal to the area of the top surface 111, or can be only provided in the area not covered by the second stacked core 2.

[0037] In some embodiments, the first positive electrode plate 11 located on the outermost side of the first stacked core 1 is provided with a positive electrode material on one side, and there is no extra layer on the outermost side of the first stacked core 1, that is, there is no lithium escape area or lithium source area, which solves the problem of lithium deposition at the edge position of the second stacked core 2 during lithium deintercalation, thereby causing a sharp increase in the combustion risk of the battery 100 and a rapid decay of the capacity, improving the safety and reliability of the battery 100 and extending the service life of the battery 100; at the same time, it also solves the problem of the formation of dead lithium when lithium is not deintercalated, thereby causing a rapid decay of the capacity of the battery 100, and extending the service life of the battery 100.

[0038] In some embodiments, the second positive electrode plate 21 located on the outermost side of the second stacked core 2 is provided with a positive electrode material on one side.

[0039] In some embodiments, both of the outermost sides of the first stacked core 1 are the first positive electrode plates 11.

[0040] In some embodiments, both of the outermost sides of the second stacked core 2 are the second positive electrode plates 21.

[0041] In some embodiments, the first stacked core 1 and the second stacked core 2 are independently arranged, and the second stacked core 2 is placed on the first stacked core 1, with a simple manufacturing process and improved assembly efficiency.

[0042] In some embodiments, after the first stacked core 1 is manufactured, it can be fixed by a first fixing member (not shown), and after the second stacked core 2 is manufactured, it can be fixed by a second fixing member (not shown), and then the second stacked core 2 is fixed on the first stacked core 1. In some embodiments, the first fixing member and the second fixing member can be tapes or the like.

[0043] In some embodiments, the second stacked core 2 can also be made by alternately stacking the second positive electrode plate 21 and the second negative electrode plate 22 on the first stacked core 1.

[0044] In some embodiments, the battery 100 includes an aluminum-plastic film (not shown) surrounding the outside of the first stacked core 1 and the second stacked core 2.

[0045] The aluminum-plastic film is a packaging material commonly used in soft-pack batteries and blade batteries, mainly playing a role in protecting internal electrodes and isolating the external environment, etc. In some embodiments, the aluminum-plastic film is a high-strength and high-barrier multi-layer composite structure composed of various plastics, aluminum foils, and adhesives.

[0046] An embodiment of the present application also provides an electronic device, including the battery 100, to provide electrical energy for the electronic device.

[0047] The electronic device includes, but is not limited to, 3C products. For example, it can be a mobile phone, a tablet computer, a computer, etc.

[0048] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the exact structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the scope of protection of this application.

Claims

1. A battery, characterized in that: It comprises a first stacked core and a second stacked core which are stacked, wherein the second stacked core and the first stacked core form a step shape; The first stack core includes a plurality of first positive plates, a plurality of first negative plates and a plurality of first separators, the plurality of first positive plates and the plurality of first negative plates are alternately stacked, and the plurality of first separators are respectively located between adjacent first positive plates and first negative plates; The second stack core comprises a plurality of second positive plates, a plurality of second negative plates and a plurality of second separators, the plurality of second positive plates and the plurality of second negative plates are alternately stacked, and the plurality of second separators are respectively located between adjacent second positive plates and second negative plates; The second positive electrode plate located at the outermost side of the second core stack is stacked on the first positive electrode plate located at the outermost side of the first core stack.

2. The battery according to claim 1, characterized in that The battery includes an adhesive layer for bonding and fixing the first positive electrode plate and the second positive electrode plate.

3. The battery according to claim 2, characterized in that The area of ​​one side of the second negative electrode plate is larger than the area of ​​one side of the second positive electrode plate, and the area of ​​the adhesive layer is larger than the area of ​​one side of the second negative electrode plate.

4. The battery according to claim 1, characterized in that The first positive electrode plate located at the outermost side of the first core stack includes a top surface facing the second positive electrode plate, and an insulating layer is provided on the top surface to prevent the second negative electrode plate from being electrically connected to the first positive electrode plate.

5. The battery according to claim 1, characterized in that A positive electrode material is disposed on a single surface of the first positive electrode plate located at the outermost side of the first stacked core; and / or a positive electrode material is disposed on a single surface of the second positive electrode plate located at the outermost side of the second stacked core.

6. The battery according to claim 1, characterized in that The two outermost plates of the first core stack are both first positive plates.

7. The battery according to claim 6, characterized in that The two outermost sides of the second core stack are both second positive plates.

8. The battery according to claim 1, characterized in that The first core stack and the second core stack are independently arranged, and the second core stack is placed on the first core stack.

9. The battery according to any one of claims 1 to 8, characterized in that: The battery includes an aluminum-plastic film surrounding the outer sides of the first stacked core and the second stacked core.

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

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