A reversibly detachable knob battery structure

Abstract

The present application relates to the technical field of batteries, and discloses a reversibly detachable knob battery structure. The battery structure includes a sleeve, a conductive connector, and an internal battery component; the conductive connector includes a positive electrode connector and a negative electrode connector, the internal battery component is embedded in the sleeve and the inner battery component is coated with an electrolyte, the positive electrode connector is inserted into the sleeve and extends to abut against one side of the internal battery component, the negative electrode connector is inserted into the other end of the sleeve and extends to abut against the other side of the internal battery component, and the ends of the positive electrode connector and the negative electrode connector that are away from each other are respectively provided with conductive rods, and the conductive rods extend out of the sleeve. The sleeve, conductive connector, and internal battery component of the present application are detachably connected, so that the internal battery component can be taken out for characterization testing and the failure changes of the positive electrode material of the battery during a long cycle process can be observed. After the test is completed, the internal battery component can be reinstalled into the sleeve to continue the electrical cycle.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a reversibly detachable knob battery structure. Background Art

[0002] With the popularization of lithium batteries, people have increasing requirements for the cycle life of lithium batteries. The positive electrode materials in lithium batteries will experience performance degradation or failure during long-term use. As the number of charge and discharge cycles increases, the lithium insertion and delithiation reactions in the positive electrode materials will gradually reduce reversibility, resulting in a decrease in battery capacity and a shortened cycle life. In addition, the solvents and salts in the electrolyte will react with the positive electrode materials to form a solid electrolyte interface film. The formation and growth of the interface film may lead to the loss of lithium ions in the electrolyte and a decrease in battery capacity. Therefore, it is necessary to observe the failure changes of the positive electrode materials of the battery during long cycles.

[0003] Existing battery systems, including button batteries, soft-pack batteries, and cylindrical batteries, are not reversibly disassembled battery systems. Therefore, it is particularly important to design a reversible battery disassembly system that can be reversibly disassembled and non-destructively characterized (such as XRD, SEM, etc.) at any time. Utility Model Content

[0004] The technical problem to be solved by the present application is to design a reversible battery disassembly system so that reversible disassembly can be performed at any time in order to observe the failure changes of the positive electrode material of the battery during a long cycle process.

[0005] In order to solve the above problems, the present application provides a reversibly detachable knob battery structure, including a sleeve, a conductive connector and an internal battery component; the conductive connector includes a positive electrode connecting part and a negative electrode connecting part, the internal battery component is embedded in the sleeve and the internal battery component is coated with electrolyte on the surrounding side, the positive electrode connecting part is inserted into the sleeve and extends to abut against one side of the internal battery component, the negative electrode connecting part is inserted into the other end of the sleeve and extends to abut against the other side of the internal battery component, and conductive rods are respectively provided at the ends of the positive electrode connecting part and the negative electrode connecting part away from each other, and the conductive rods extend out of the sleeve.

[0006] Preferably, the internal battery component includes a positive electrode sheet, a separator and a negative electrode sheet, and the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence inside the sleeve, the positive electrode connecting part abuts against the positive electrode sheet, and the negative electrode connecting part abuts against the negative electrode sheet.

[0007] Preferably, an inner cavity penetrating through both ends of the sleeve is provided inside the sleeve, and the positive electrode connecting part, the positive electrode sheet, the diaphragm, the negative electrode sheet and the negative electrode connecting part are detachably arranged in the inner cavity in sequence.

[0008] Preferably, the positive electrode connection part and the negative electrode connection part are both cylindrical, the outer side walls of the positive electrode connection part and the negative electrode connection part are respectively provided with external threads, and the side walls of the inner cavity are provided with internal threads, and the positive electrode connection part and the negative electrode connection part are respectively detachably connected to the sleeve through the external threads cooperating with the internal threads of the inner cavity.

[0009] Preferably, the sleeve is made of polytetrafluoroethylene.

[0010] Preferably, the conductive connecting piece is made of stainless steel.

[0011] Preferably, the total length of the positive electrode connecting part and the negative electrode connecting part is greater than the length of the sleeve.

[0012] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0013] When installing the battery structure of the present application, first insert a part of the positive electrode connection part into the interior of one end of the sleeve, then load the internal battery components into the sleeve, abut one side of the internal battery components against one end of the positive electrode connection part, drip electrolyte so that the surrounding side of the internal battery components is coated with electrolyte, then insert a part of the negative electrode connection part into the other end of the sleeve and abut the other side of the internal battery components, and the positive electrode connection part cooperates with the negative electrode connection part to squeeze and fix the internal battery components in the middle of the sleeve. After the conductive rod on the positive electrode connection part is connected to the positive pole of the power source and the conductive rod on the negative electrode connection part is connected to the negative pole of the power source, the power cycle can be turned on. After the power cycle reaches the target number of cycles, the battery structure can be disassembled to take out the internal battery components for characterization testing. After the test is completed, the internal battery components can be reinstalled into the sleeve to continue the power cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is an overall perspective view of the reversibly detachable knob battery structure of an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the assembly relationship of the reversibly detachable knob battery structure of an embodiment of the present application.

[0017] Explanation of the reference numerals: 1. sleeve; 11. inner cavity; 2. conductive connector; 21. positive electrode connector; 22. negative electrode connector; 23. conductive rod; 3. internal battery component; 31. positive electrode sheet; 32. diaphragm; 33. negative electrode sheet. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or combinations thereof.

[0020] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0021] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0022] Please refer to Figure 1 and Figure 2 , the embodiment of the present application provides a reversibly detachable knob battery structure, which includes a sleeve 1, a conductive connector 2 and an internal battery component 3. Among them, the conductive connector 2 includes a positive electrode connector 21 and a negative electrode connector 22, the internal battery component 3 is embedded in the sleeve 1, and the inner battery component 3 is coated with electrolyte, the positive electrode connector 21 is inserted into the sleeve 1 and extends to abut against one side of the internal battery component 3, the negative electrode connector 22 is inserted into the other end of the sleeve 1 and extends to abut against the other side of the internal battery component 3, and the ends of the positive electrode connector 21 and the negative electrode connector 22 that are away from each other are respectively provided with conductive rods 23, and the conductive rods 23 extend out of the sleeve 1.

[0023] Therefore, when installing the battery structure of the embodiment of the present application, first insert a part of the positive electrode connection part 21 into the interior of one end of the sleeve 1, then load the internal battery component 3 into the sleeve 1, one side of the internal battery component 3 abuts against one end of the positive electrode connection part 21, drip the electrolyte so that the inner battery component 3 is coated with the electrolyte, and then insert a part of the negative electrode connection part 22 into the other end of the sleeve 1 and abut against the other side of the internal battery component 3, and the positive electrode connection part 21 cooperates with the negative electrode connection part 22 to squeeze and fix the internal battery component 3 in the middle of the sleeve 1. After the conductive rod 23 on the positive electrode connection part 21 is connected to the positive electrode of the power source, and the conductive rod 23 on the negative electrode connection part 22 is connected to the negative electrode of the power source, the power cycle can be turned on. After the power cycle reaches the target number of laps, the battery structure can be disassembled to take out the internal battery component 3 for characterization testing, so as to observe the failure changes of the positive electrode material of the battery during the long cycle process. After the test is completed, the internal battery component 3 can be reloaded into the sleeve 1 to continue the power cycle.

[0024] In a specific embodiment, the sleeve 1 is provided with an inner cavity 11 that runs through both ends of the sleeve 1, and the internal battery component 3 includes a detachably connected positive electrode sheet 31, a diaphragm 32, and a negative electrode sheet 33. Among them, the positive electrode sheet 31, the diaphragm 32, and the negative electrode sheet 33 are sequentially stacked in the inner cavity 11, and the positive electrode connecting portion 21, the positive electrode sheet 31, the diaphragm 32, the negative electrode sheet 33, and the negative electrode connecting portion 22 are sequentially detachably arranged inside the sleeve 1, so that the battery structure can be easily disassembled, and the positive electrode sheet 31 can be taken out for characterization testing, so as to facilitate the observation of the failure changes of the positive electrode material of the battery during the long cycle process.

[0025] In a specific embodiment, the sleeve 1 is cylindrical, and the positive electrode connection part 21 and the negative electrode connection part 22 are both cylindrical. Among them, the outer walls of the positive electrode connection part 21 and the negative electrode connection part 22 are respectively provided with external threads, and the side walls of the inner cavity 11 are provided with internal threads. The positive electrode connection part 21 and the negative electrode connection part 22 are respectively threadedly connected with the internal threads of the inner cavity 11 through external threads, so that they can be detachably arranged in the sleeve 1, so as to disassemble the battery structure and take out the positive electrode sheet 31. In this embodiment, the thread radius of the external thread and the internal thread is 0.2-0.4mm, for example, it can be 0.2mm, 0.3mm, 0.4mm, etc., preferably 0.3mm; in other embodiments, the thread radius of the external thread and the internal thread can also be other sizes.

[0026] In a specific embodiment, the sleeve 1 is made of polytetrafluoroethylene, and the conductive connector 2 is made of stainless steel. Polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. The use of polytetrafluoroethylene as the sleeve 1 can increase the service life of the sleeve 1, and the excellent electrical insulation can improve the safety of the battery structure. Stainless steel has the characteristics of wear resistance and conductivity. The use of stainless steel as the conductive connector 2 can connect the conductive connector 2 to an external power source for power circulation.

[0027] In a specific embodiment, the total length of the positive electrode connection part 21 plus the negative electrode connection part 22 is greater than the length of the sleeve 1, so that the conductive rods 23 on the positive electrode connection part 21 and the negative electrode connection part 22 extend to the outside of the sleeve 1. In this embodiment, the length L1 of the sleeve 1 is 20 mm, the length L2 of the positive electrode connection part 21 and the negative electrode connection part 22 are both 40 mm, and the length L3 of the conductive rod 23 is 10 mm; in other embodiments, the sizes of the sleeve 1, the positive electrode connection part 21, the negative electrode connection part 22 and the conductive rod 23 can be adjusted according to actual needs.

[0028] In a specific embodiment, the positive electrode sheet 31, the diaphragm 32 and the negative electrode sheet 33 are all in the shape of discs, and the diameters of the positive electrode sheet 31, the diaphragm 32 and the negative electrode sheet 33 are all smaller than the diameter of the inner cavity 11 of the sleeve 1, and the diameter of the diaphragm 32 is larger than the diameters of the positive electrode sheet 31 and the negative electrode sheet 33. In this embodiment, the diameter D of the inner cavity 11 is 12 mm, the diameter of the positive electrode sheet 31 is 8 mm, the diameter of the diaphragm 32 is 10 mm, and the diameter of the negative electrode sheet 33 is 9 mm. Therefore, the positive electrode sheet 31, the diaphragm 32 and the negative electrode sheet 33 can be axially loaded into the inner cavity 11 of the sleeve 1, and the diaphragm 32 is used to separate the positive electrode sheet 31 from the negative electrode sheet 33 to prevent ions from directly moving between the two electrode sheets.

[0029] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A reversibly detachable knob battery structure, characterized in that: It includes a sleeve, a conductive connecting part and an internal battery part; The conductive connector includes a positive electrode connector and a negative electrode connector. The internal battery component is embedded in the sleeve and is coated with electrolyte on the periphery of the internal battery component. The positive electrode connector is inserted into the sleeve and extends to abut against one side of the internal battery component. The negative electrode connector is inserted into the other end of the sleeve and extends to abut against the other side of the internal battery component. Conductive rods are respectively provided at the ends of the positive electrode connector and the negative electrode connector that are away from each other, and the conductive rods extend out of the sleeve.

2. A reversibly detachable knob battery structure according to claim 1, characterized in that: The internal battery component includes a positive electrode sheet, a separator and a negative electrode sheet, which are sequentially stacked inside the sleeve, the positive electrode connecting portion abuts against the positive electrode sheet, and the negative electrode connecting portion abuts against the negative electrode sheet.

3. The reversibly detachable knob battery structure according to claim 2, characterized in that: An inner cavity penetrating through both ends of the sleeve is provided inside the sleeve, and the positive electrode connecting part, the positive electrode sheet, the diaphragm, the negative electrode sheet and the negative electrode connecting part are detachably arranged in the inner cavity in sequence.

4. The reversibly detachable knob battery structure according to claim 3, characterized in that: The positive electrode connection part and the negative electrode connection part are both cylindrical, and the outer side walls of the positive electrode connection part and the negative electrode connection part are respectively provided with external threads, and the side walls of the inner cavity are provided with internal threads. The positive electrode connection part and the negative electrode connection part are respectively detachably connected to the sleeve through the external threads cooperating with the internal threads of the inner cavity.

5. The reversibly detachable knob battery structure according to claim 1, characterized in that: The sleeve is made of polytetrafluoroethylene.

6. The reversibly detachable knob battery structure according to claim 1, characterized in that: The conductive connecting piece is made of stainless steel.

7. The reversibly detachable knob battery structure according to claim 1, characterized in that: The total length of the positive electrode connecting portion plus the negative electrode connecting portion is greater than the length of the sleeve.

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