Shell cover structure and button cell

Abstract

The utility model provides a shell cover structure and a button cell. The shell cover structure comprises a containing shell and a top cover assembly, a containing cavity is formed in the containing shell, the periphery of the top cover assembly is connected to an opening of the containing shell, and the top cover assembly is provided with a pole. The shell cover structure further comprises a cover end abutting piece and a shell end abutting piece, the cover end abutting piece is located in the containing cavity and connected with the pole, and the cover end abutting piece is used for abutting against the first pole lug of the roll core. The shell end abutting piece is located in the containing cavity and connected with the end, away from the top cover assembly, of the containing shell, the shell end abutting piece is used for abutting against a second electrode lug of the roll core, and the shell end abutting piece and the cover end abutting piece are jointly used for clamping the roll core. Therefore, the welding operation of the first tab and the second tab is omitted, and the convenience and the efficiency of assembling the button cell are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of button batteries, and in particular to a shell cover structure and a button battery. Background Art

[0002] With the development of portable electronic products and smart wearable electronic products, batteries are required to be more miniaturized. While maintaining a long life, the battery is required to have the highest possible volume energy and mass energy, so the demand for button batteries is also increasing.

[0003] The button battery mainly includes a shell, a winding core and a cap. The winding core is arranged in the shell. The two ends of the winding core are respectively provided with a positive electrode ear and a negative electrode ear. The cap is covered on the shell. The positive and negative electrodes are connected to the cover plate, and the negative electrode ear is connected to the steel shell.

[0004] In the related art, document CN110364676A discloses a button-type lithium secondary battery, in which an insulating ring is located between an upper shell and a lower shell, the upper shell is a cover plate, the insulating ring is closely abutted against the upper shell and the lower shell respectively, the first pole ear is welded to the upper shell, and the second pole ear is welded to the lower shell. However, since the insulating ring increases the thickness of the battery, the space utilization rate of the battery is poor.

[0005] In order to improve the space utilization of the battery, document No. CN113437410A discloses a button battery and a preparation method thereof, in which the first pole ear is welded to the top cover assembly, the second pole ear is welded to the bottom wall of the shell, and the outer edge of the top cover assembly is welded to the opening of the shell, thereby eliminating the structure between the shell and the cover plate and improving the space utilization of the battery.

[0006] However, the above technical solutions require welding of the positive and negative pole ears during the assembly process, that is, during the assembly process of the button battery, the first pole ear needs to be welded to the cover plate, and the second pole ear needs to be welded to the shell, resulting in poor assembly convenience and efficiency of the button battery. Utility Model Content

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a shell cover structure and a button battery that make button battery assembly more convenient and efficient.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A shell cover structure comprises a housing shell and a top cover assembly, wherein the housing shell is formed with a receiving cavity, the periphery of the top cover assembly is connected to the opening of the housing shell, the top cover assembly has a pole, and the shell cover structure further comprises:

[0010] A cover end abutment member, located in the receiving cavity and connected to the pole, the cover end abutment member being used to abut against the first pole ear of the winding core; and

[0011] The shell end abutment is located in the accommodating cavity and connected to one end of the accommodating shell away from the top cover assembly. The shell end abutment is used to abut against the second pole ear of the winding core. The shell end abutment and the cover end abutment are also used together to clamp the winding core.

[0012] In one embodiment, the top cover assembly further includes a cover sheet and an anti-short circuit layer, the periphery of the cover sheet is connected to the opening of the accommodating shell, the cover sheet is provided with a through hole, and the anti-short circuit layer is connected to one side of the cover sheet;

[0013] The pole includes a connecting piece and a connecting column, the connecting piece is connected to the side of the anti-short circuit layer away from the cover plate, the connecting column is connected to one side of the connecting piece, the connecting column is penetrated by the through hole, and the cover end abutment is connected to the connecting column.

[0014] In one embodiment, an annular connecting groove is formed at the opening of the accommodating shell, and the annular connecting groove extends to the accommodating cavity and one end surface of the accommodating shell respectively, and an inner peripheral wall of the annular connecting groove is formed with an internal thread structure; an outer peripheral wall of the top cover assembly is formed with an external thread structure, and the external thread structure is threadedly connected with the internal thread structure;

[0015] The shell cover structure also includes a sealing ring, which is located in the annular connecting groove and elastically abuts against the top cover assembly and the accommodating shell respectively.

[0016] In one of the embodiments, a positioning groove is provided on the inner wall of the annular connecting groove, the positioning groove is staggered with the internal thread structure, and a portion of the sealing ring is embedded in the positioning groove.

[0017] In one embodiment, the cover end abutment is located at the center of the top cover assembly.

[0018] In one of the embodiments, the shell end abutment is located at the center of the bottom of the accommodating shell.

[0019] In one of the embodiments, the cover end abutment member and the shell end abutment member are symmetrically arranged relative to the winding core.

[0020] In one embodiment, the cover end abutment member and the pole are an integrally formed structure.

[0021] In one embodiment, the shell end abutment member and the accommodating shell are an integrally formed structure.

[0022] A button battery comprises the shell cover structure described in any one of the above embodiments.

[0023] Compared with the prior art, the present invention has at least the following advantages:

[0024] After placing the winding core in the receiving cavity of the accommodating shell, the shell end abutment abuts against the second pole ear of the winding core, so that the accommodating shell is electrically connected to the second pole ear through the shell end abutment; after connecting the periphery of the top cover assembly to the opening of the accommodating shell, the pole is electrically connected to the first pole ear of the winding core through the cover end abutment, and the cover end abutment and the shell end abutment clamp the winding core together, ensuring the electrical connection stability between the first pole ear and the pole, and ensuring the electrical connection stability between the second pole ear and the accommodating shell. In this way, in the assembly process of the button battery, the welding operation of the first pole ear and the second pole ear is omitted, which improves the convenience and efficiency of assembling the button battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a button battery according to an embodiment;

[0027] Figure 2 for Figure 1 A schematic diagram of a partial structure of a button battery shown;

[0028] Figure 3 for Figure 1 Another partial structural schematic diagram of the button battery shown;

[0029] Figure 4 for Figure 1 An enlarged schematic diagram of the button cell at point A is shown.

[0030] Figure markings: button battery 10; shell cover structure 100; accommodating shell 110; internal thread structure 110a; accommodating cavity 111; annular connecting groove 112; positioning groove 113; top cover assembly 120; pole 121; connecting piece 1211; connecting column 1212; cover piece 122; through hole 1221; anti-short circuit layer 123; external thread structure 1201; cover end abutment 130; shell end abutment 140; sealing ring 150; winding core 300; first pole ear 310; second pole ear 320. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0035] like Figure 1 As shown, a button cell 10 of an embodiment includes a shell cover structure 100 and a winding core 300, wherein the winding core 300 is disposed in the shell cover structure 100, and a first pole tab 310 and a second pole tab 320 are respectively disposed at two ends of the winding core 300. It can be understood that the first pole tab 310 is one of the positive pole tab and the negative pole tab, and the second pole tab 320 is the other of the positive pole tab and the negative pole tab.

[0036] like Figures 1 to 3As shown, in one embodiment, the shell cover structure 100 includes a housing shell 110 and a top cover assembly 120. The housing shell 110 is formed with a receiving cavity 111. The receiving cavity 111 is used to receive the winding core 300 and the electrolyte. The periphery of the top cover assembly 120 is connected to the opening of the housing shell 110, so that the top cover assembly 120 and the inner wall of the receiving cavity 111 together form a closed space. The top cover assembly 120 has a pole 121. The shell cover structure 100 also includes a cover end abutment 130 and a shell end abutment 140. The cover end abutment 130 is located in the receiving cavity 111 and connected to the pole 121. The cover end abutment 130 is used to abut against the first pole ear 310 of the winding core 300. The shell end abutment 140 is located in the accommodating cavity 111 and is connected to one end of the accommodating shell 110 away from the top cover assembly 120, that is, the shell end abutment 140 is connected to the bottom wall of the accommodating cavity 111. The shell end abutment 140 is used to abut against the second pole ear 320 of the winding core 300. The shell end abutment 140 and the cover end abutment 130 are also used together to clamp the winding core 300 so that the winding core 300 is fixed in the accommodating cavity 111.

[0037] like Figure 1 As shown, in this embodiment, when assembling the button battery 10, the core 300 is first placed in the accommodating cavity 111 so that the second pole ear 320 of the core 300 abuts against the shell end abutment 140, and then the periphery of the top cover assembly 120 is connected to the opening of the accommodating shell 110 so that the cover end abutment 130 abuts against the second pole ear 320 of the core 300, and the cover end abutment 130 and the shell end abutment 140 jointly clamp the core 300, so that the core 300 is fixed in the accommodating cavity 111.

[0038] The button battery 10 and shell cover structure 100 mentioned above, after placing the winding core 300 in the accommodating cavity 111 of the accommodating shell 110, the shell end abutment 140 abuts against the second pole ear 320 of the winding core 300, so that the accommodating shell 110 is electrically connected to the second pole ear 320 through the shell end abutment 140; after connecting the periphery of the top cover assembly 120 to the opening of the accommodating shell 110, the pole 121 is electrically connected to the first pole ear 310 of the winding core 300 through the cover end abutment 130, and the cover end abutment 130 and the shell end abutment 140 jointly clamp the winding core 300, ensuring the electrical connection stability between the first pole ear 310 and the pole 121, and ensuring the electrical connection stability between the second pole ear 320 and the accommodating shell 110. In this way, during the assembly process of the button cell, the welding operation of the first electrode tab 310 and the second electrode tab 320 is omitted, thereby improving the convenience and efficiency of assembling the button cell 10 .

[0039] like Figure 1 and Figure 2As shown, in one embodiment, the top cover assembly 120 also includes a cover sheet 122 and an anti-short circuit layer 123. The periphery of the cover sheet 122 is connected to the opening of the accommodating shell 110. The cover sheet 122 is provided with a through hole 1221. The anti-short circuit layer 123 is connected to one side of the cover sheet 122. The pole 121 includes a connecting sheet 1211 and a connecting column 1212. The connecting sheet 1211 is connected to the side of the anti-short circuit layer 123 away from the cover sheet 122. The connecting column 1212 is connected to one side of the connecting sheet 1211. The connecting column 1212 is penetrated by the through hole 1221, and the cover end abutment 130 is connected to the connecting column 1212. In this embodiment, the anti-short circuit layer 123 is arranged between the cover sheet 122 and the connecting sheet 1211 to avoid the problem of short circuit caused by contact between the cover sheet 122 and the connecting sheet 1211.

[0040] like Figures 2 to 4 As shown, in one embodiment, an annular connecting groove 112 is provided at the opening of the accommodating shell 110, and the annular connecting groove 112 extends to the accommodating cavity 111 and one end surface of the accommodating shell 110 respectively, and an internal thread structure 110a is formed on the inner peripheral wall of the annular connecting groove 112, and the internal thread structure 110a is extended along the circumference of the annular connecting groove 112. An external thread structure 1201 is formed on the outer peripheral wall of the top cover assembly 120, and the external thread structure 1201 is threadedly connected with the internal thread structure 110a, so that the periphery of the top cover assembly 120 is fixed at the opening of the accommodating shell 110. The shell cover structure 100 also includes a sealing ring 150, which is located in the annular connecting groove 112. The sealing ring 150 elastically abuts against the top cover assembly 120 and the accommodating shell 110 respectively, so that the sealing ring 150 seals the connection between the top cover assembly 120 and the accommodating shell 110, thereby avoiding the problem of leakage of the electrolyte in the accommodating cavity 111.

[0041] like Figure 4 As shown, in this embodiment, the periphery of the top cover assembly 120 is threadedly connected to the opening of the accommodating shell 110, avoiding welding of the connection between the top cover assembly 120 and the accommodating shell 110, further improving the convenience and efficiency of assembling the button battery 10. Moreover, by rotating the top cover assembly 120 or the accommodating shell 110, the depth of the top cover assembly 120 entering the accommodating shell 110 can be adjusted, so that the size of the cover end abutment 130 and the shell end abutment 140 can have errors, reducing the size accuracy requirements of the cover end abutment 130 and the shell end abutment 140, thereby reducing the processing difficulty of the shell cover structure 100.

[0042] like Figure 4As shown, in one embodiment, a positioning groove 113 is provided on the inner wall of the annular connecting groove 112, the positioning groove 113 is staggered with the internal thread structure 110a, and a portion of the sealing ring 150 is embedded in the positioning groove 113. In this embodiment, the positioning groove 113 plays a role in positioning the sealing ring 150, thereby improving the convenience of installing the sealing ring 150, while improving the position stability of the sealing ring 150 and improving the sealing effect of the sealing ring 150.

[0043] like Figure 1 As shown, in one embodiment, the cover end abutment member 130 is located at the center of the top cover assembly 120, so that the force applied to the top cover assembly 120 is more uniform.

[0044] like Figure 1 As shown, in one embodiment, the shell end abutment member 140 is located at the center of the bottom of the accommodating shell 110 , so that the force applied to the accommodating shell 110 is more uniform.

[0045] like Figure 1 As shown, in one embodiment, the cover end abutment member 130 and the shell end abutment member 140 are symmetrically arranged relative to the winding core 300, so that the force applied to the winding core 300 is more uniform.

[0046] like Figure 1 As shown, in one embodiment, the cover end abutment member 130 and the pole 121 are an integrally formed structure, which improves the efficiency of manufacturing the shell cover structure 100 .

[0047] like Figure 1 As shown, in one of the embodiments, the shell end abutment member 140 and the accommodating shell 110 are an integrally formed structure, which improves the efficiency of manufacturing the shell cover structure 100 .

[0048] Compared with the prior art, the present invention has at least the following advantages:

[0049] After the winding core 300 is placed in the receiving cavity 111 of the accommodating shell 110, the shell end abutment 140 abuts against the second pole ear 320 of the winding core 300, so that the accommodating shell 110 is electrically connected to the second pole ear 320 through the shell end abutment 140; after the periphery of the top cover assembly 120 is connected to the opening of the accommodating shell 110, the pole 121 is electrically connected to the first pole ear 310 of the winding core 300 through the cover end abutment 130, and the cover end abutment 130 and the shell end abutment 140 clamp the winding core 300 together, ensuring the electrical connection stability between the first pole ear 310 and the pole 121, and ensuring the electrical connection stability between the second pole ear 320 and the accommodating shell 110. In this way, in the assembly process of the button battery, the welding operation of the first pole ear 310 and the second pole ear 320 is omitted, which improves the convenience and efficiency of assembling the button battery 10.

[0050] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A shell cover structure, comprising a housing shell and a top cover assembly, wherein the housing shell is formed with a receiving cavity, the periphery of the top cover assembly is connected to the opening of the housing shell, and the top cover assembly has a pole, characterized in that: The shell cover structure also includes: A cover end abutment member, located in the receiving cavity and connected to the pole, the cover end abutment member being used to abut against the first pole ear of the winding core; and The shell end abutment is located in the accommodating cavity and connected to one end of the accommodating shell away from the top cover assembly. The shell end abutment is used to abut against the second pole ear of the winding core. The shell end abutment and the cover end abutment are also used together to clamp the winding core.

2. The shell cover structure according to claim 1, characterized in that: The top cover assembly further includes a cover sheet and an anti-short circuit layer, wherein the periphery of the cover sheet is connected to the opening of the accommodating shell, the cover sheet is provided with a through hole, and the anti-short circuit layer is connected to one side of the cover sheet; The pole includes a connecting piece and a connecting column, the connecting piece is connected to the side of the anti-short circuit layer away from the cover plate, the connecting column is connected to one side of the connecting piece, the connecting column is penetrated by the through hole, and the cover end abutment is connected to the connecting column.

3. The shell cover structure according to claim 1, characterized in that: An annular connecting groove is formed at the opening of the accommodating shell, and the annular connecting groove extends to the accommodating cavity and one end surface of the accommodating shell respectively, and an inner peripheral wall of the annular connecting groove is formed with an internal thread structure; an outer peripheral wall of the top cover assembly is formed with an external thread structure, and the external thread structure is threadedly connected with the internal thread structure; The shell cover structure also includes a sealing ring, which is located in the annular connecting groove and elastically abuts against the top cover assembly and the accommodating shell respectively.

4. The housing cover structure according to claim 3, characterized in that: The inner wall of the annular connecting groove is provided with a positioning groove, the positioning groove and the internal thread structure are staggered, and a part of the sealing ring is embedded in the positioning groove.

5. The housing cover structure according to claim 1, characterized in that: The cover end abutment is located at the center of the top cover assembly.

6. The housing cover structure according to claim 1, characterized in that: The shell end abutment piece is located at the center of the bottom of the accommodating shell.

7. The housing cover structure according to claim 1, characterized in that: The cover end abutment member and the shell end abutment member are symmetrically arranged relative to the winding core.

8. The housing cover structure according to claim 1, characterized in that: The cover end abutment member and the pole are an integrally formed structure.

9. The housing cover structure according to claim 1, characterized in that: The shell end abutment member and the accommodating shell are an integrally formed structure.

10. A button battery, characterized in that: The invention comprises the shell cover structure according to any one of claims 1 to 9.

Images