Battery cap assembly, battery and electronic equipment

Abstract

The utility model relates to a battery cap assembly, a battery and electronic equipment, the battery cap assembly comprises a pole, a sealing element embedded on the pole, a cap sleeved on the pole and a locking element connected with the pole in a locking manner, and the pole is tightly attached to the cap after the locking element is locked; a blind hole is formed in the end part of the pole, and the sealing piece is embedded in the blind hole to enable the blind hole to expand and deform. The battery cap assembly designed by the utility model is simple in structure and good in sealing performance, and the problem of battery liquid leakage can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage device technical field especially relates to a battery cap assembly, battery and electronic equipment. BACKGROUND

[0002] Lithium battery includes battery cap assembly, shell, roll core and electrolyte etc., is a kind of chemical energy into electrical energy device, because its energy is high, cycle times are more and so on, widely used in various fields.Battery is stored and used in the process, cap assembly needs to have good sealing property, avoid battery internal electrolyte leakage.The existing battery cap assembly structure is relatively complex, and the efficiency is low when assembling, and the sealing effect of the cap still needs to be further improved. SUMMARY

[0003] In view of the above problems, the utility model aims at designing a battery cap assembly, battery and electronic equipment, and the battery cap assembly is simple in structure and good in sealing property, so that the problem of battery liquid leakage can be effectively avoided.

[0004] The utility model discloses the purpose that is realized through the following technical schemes:

[0005] Design a kind of battery cap assembly, including pole, embedding in the sealing piece of the pole, cover cap is set on the pole, and the locking piece is locked with the pole, the locking piece is locked and makes the pole and the cover cap tightly adhere;The end of the pole is provided with blind hole, and the sealing piece is embedded in the blind hole to make the blind hole swell deformation.

[0006] The battery cap assembly designed in the scheme realizes good sealing effect by the cooperation of two groups of sealing structures.First, the pole is locked with the locking piece, and the cover cap is located between the pole and the locking piece, so that the locking piece is locked and the cover cap and the pole are tightly pressed to realize primary sealing;Second, the end of the pole is provided with blind hole, and the sealing piece is pressed into the blind hole to make the hole wall of the blind hole swell in the radial direction, and then the cover cap is extruded to realize secondary sealing.The above design is not only simple in structure, but also good in sealing effect, and can avoid the problem of electrolyte leakage in the battery after being welded and sealed with the shell of the battery, to improve the yield of the battery.

[0007] Further, the pole includes a protruding portion and an abutting portion, the cover cap has a through hole in the middle, the protruding portion passes through the through hole and is locked with the locking portion, and the abutting portion abuts against the lower surface of the cover cap.

[0008] The cross section of the pole is T-shaped, including a columnar protruding portion protruding towards the cover cap and an abutting portion connected with the protruding portion, the protruding portion is locked with the locking piece after passing through the through hole of the cover cap, and the abutting portion tightly adheres to the cover cap.

[0009] Further, the convex portion is provided with a thread, and the locking member is a nut matched with the thread.

[0010] The convex portion and the locking member are locked by thread connection, which is simple in structure, high in efficiency during assembly, stable in connection structure and low in failure risk.

[0011] Further, the abutting portion is outwardly convex in a spiral shape, and the spiral direction is consistent with the direction of the thread.

[0012] The abutting portion is outwardly convex in a spiral shape, and after the cap is connected with the battery shell, the gas generated in the battery formation process increases the internal gas pressure, and the gas applies a force to the abutting portion in the direction of the spiral direction, so that the convex portion and the nut are more tightly screwed, which is beneficial to the sealing of the cap.

[0013] Further, the blind hole is located at the center of the convex portion, the sealing member is a spherical sealing member, and the diameter of the sealing member is greater than the hole diameter of the blind hole.

[0014] The sealing member can be a spherical sealing member, such as a metal ball, and the blind hole is a cylindrical hole. The diameter of the metal ball is greater than the hole diameter of the blind hole. During the process of pressing the metal ball into the blind hole, the hole wall of the blind hole is deformed to extrude the cap to achieve sealing. At the same time, the metal ball and the inner wall of the blind hole are in line contact rather than surface contact, and the friction is small. The bottom of the blind hole can be designed as an explosion-proof safety valve. When the internal temperature of the battery is out of control and the gas pressure increases rapidly, the explosion-proof valve breaks, the gas pushes the metal ball out of the blind hole to release pressure, and the battery explosion is avoided.

[0015] Further, the cap includes a cap piece and an insulating member, the insulating member is provided with an annular groove at the outer periphery, the cap piece is embedded in the annular groove, and the abutting portion abuts against the lower surface of the insulating member.

[0016] The insulating member is an annular cylindrical structure made of insulating plastic. An annular groove is formed at the outer periphery of the cylindrical body, and a hole matched with the annular groove is formed in the middle of the cap piece. The cap piece is embedded and installed in the annular groove through the hole. The insulating member insulates and separates the pole and the cap piece to prevent short circuit.

[0017] Further, the insulating member is provided with a cavity at the end away from the abutting portion, and the locking member is located in the cavity.

[0018] After the locking member is locked with the pole, it is located in the cavity on the upper end surface of the insulating member, and the cavity isolates the locking member inside to avoid contact with the cap piece and prevent short circuit.

[0019] A battery is designed, which comprises a shell, a winding core nested in the shell, and the battery cap assembly as described above, the battery cap assembly covers the end of the shell to seal the winding core in the shell.

[0020] The present application also designs a battery, which comprises a shell, a winding core nested in the shell, and a cap assembly covering the end of the shell, and the battery cap assembly and the shell are welded together by laser to form a sealed structure. The battery has stable structure, good sealing performance and high reliability.

[0021] Further, the winding core comprises a first tab, and the first tab is electrically connected with the pole.

[0022] The end of the winding core extends the first tab, and the first tab and the abutting portion of the pole are welded together by laser welding to realize electrical connection.

[0023] An electronic device is designed, which comprises the battery as described above.

[0024] The present application also designs an electronic device, which uses the battery as described above to provide stable energy for the electronic device to work normally.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The battery cap assembly designed in the present application realizes good sealing effect through the cooperation of the two sealing structures. First, the pole and the locking piece are locked and connected, the cap is located between the pole and the locking piece, so that the locking piece and the pole are locked together, the cap and the pole are tightly pressed to realize primary sealing; second, the end of the pole is provided with a blind hole, and the sealing piece is pressed into the blind hole to make the hole wall of the blind hole expand in the radial direction, and then the cap is pressed to realize secondary sealing. The above design not only has simple structure, but also has good sealing effect, and can avoid the problem of leakage of electrolyte in the battery after being welded and sealed with the shell of the battery, thereby improving the yield of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a whole structure diagram of the battery of an embodiment of the present application.

[0028] Figure 2 It is an exploded view of the battery of an embodiment of the present application.

[0029] Figure 3 It is a sectional view of the battery of an embodiment of the present application.

[0030] Figure 4 It is Figure 3 It is a local enlarged view of A in the middle.

[0031] ILLUSTRATION: 1, battery cap assembly; 11, pole; 12, sealing element; 13, cap; 14, locking element; 111, blind hole; 112, protruding part; 113, abutting part; 131, cap piece; 132, insulating element; 133, through hole; 134, annular groove; 135, cavity; 2, shell; 3, roll core; 31, first pole lug. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein.

[0033] As Figures 1 to 4 shown, according to the first embodiment of the present application, a battery cap assembly 1 is provided, comprising a pole 11, a sealing element embedded on the pole 11, a cap 13 sleeved on the pole 11, and a locking element 14 locked and connected with the pole 11. The cross section of the pole 11 is T-shaped, comprising a columnar protruding part 112 protruding towards the cap and an abutting part 113 connected with the protruding part 112, and the cap 13 is provided with a through hole 133 in the middle, the protruding part 112 passes through the through hole 133, and the abutting part 113 abuts with the lower surface of the cap 13; the outer periphery of the protruding part 112 is provided with threads, the locking element 14 can adopt a nut matched with the threads, and the protruding part 112 is locked together with the nut through the thread structure, so that the abutting part 113 is tightly attached with the cap 13, and the locking connection is achieved in the form of threaded connection, which not only has a simple structure and high efficiency in assembly operation, but also has stable connection structure and low failure risk. The end of the pole 11 is provided with a blind hole 111, and the blind hole 111 is located at the center position of the protruding part 112. The sealing element 12 can adopt a spherical sealing element 12, the diameter of the sealing element 12 is greater than the hole diameter of the blind hole 111, and the sealing element 12 is embedded in the blind hole 111 to make the blind hole expand and deform. The sealing element 12 can adopt a metal ball, and the blind hole 111 is a columnar hole. The diameter of the metal ball is greater than the hole diameter of the blind hole 111. In the process of pressing the metal ball into the blind hole 111, the hole wall of the blind hole 111 deforms and extrudes the cap 13 to achieve sealing. At the same time, the metal ball and the inner wall of the blind hole 111 are in line contact rather than surface contact, the friction is small, and the bottom of the blind hole 111 can be designed as an explosion-proof safety valve. When the internal temperature of the battery is out of control and the gas pressure increases rapidly, the explosion-proof valve breaks, the gas pushes the metal ball out along the blind hole 111 to release pressure, and the battery explosion is avoided.

[0034] The battery cap assembly designed in the scheme realizes good sealing effect through the cooperation of two groups of sealing structures. First, the pole column 11 is locked and connected with the locking piece 14, the cap 13 is located between the pole column 11 and the locking piece 14, so that after the locking piece 14 is locked with the pole column 11, the cap 13 is tightly pressed with the pole column 11 to realize primary sealing; second, the end of the pole column 11 is provided with a blind hole 111, the sealing piece 12 is pressed into the blind hole 111 to make the hole wall of the blind hole 111 expand in the radial direction, and then the cap 13 is extruded to realize secondary sealing. The above design not only has a simple structure, but also has good sealing effect, and after being welded and sealed with the shell 2 of the battery, the problem of electrolyte leakage in the battery can be avoided, and the yield of the battery is improved.

[0035] As shown in Figure 2 , the outer periphery of the abutment portion 113 protrudes outward in a spiral shape, and the spiral direction is consistent with the direction of the threads of the protruding portion 112. After the cap 13 is connected with the shell 2 of the battery, gas is generated during the formation process of the battery, which causes the internal gas pressure to increase, and the gas applies a force to the abutment portion 113 in the direction of the spiral direction, so that the protruding portion 112 and the nut are more tightly screwed, which is beneficial to the sealing of the cap 13.

[0036] As shown in Figure 1 and Figure 4 , the cap 13 includes a cap piece 131 and an insulating piece 132, the outer periphery of the insulating piece 132 is provided with an annular groove 134, the cap piece 131 is embedded on the annular groove 134, and the abutment portion 113 abuts against the lower surface of the insulating piece 132. The insulating piece 132 is a ring-shaped cylindrical structure made of insulating plastic, and the annular groove 134 is provided on the outer periphery of the cylindrical body. The cap piece 131 is provided with a hole matching the annular groove 134 in the middle, and the cap piece 131 is embedded and installed on the annular groove 134 through the hole; the insulating piece 132 insulates and separates the pole column 11 and the cap piece 131 to prevent short circuit. The end of the insulating piece 132 away from the abutment portion 113 is provided with a cavity 135, and the locking piece 14 is located in the cavity 135. After the locking piece 14 is locked and connected with the pole column 11, it is placed in the cavity 135 on the upper end surface of the insulating piece 132, and the cavity 135 isolates the locking piece 14 inside to avoid contact with the cap piece 131 and prevent short circuit.

[0037] As shown in Figure 1 and Figure 3As shown, according to the second embodiment of the present application, a battery is provided, which comprises a shell 2, a winding core 3 nested in the shell 2, and the battery cap assembly 1 described above, the winding core 3 extends out a first tab 31 at one end, the first tab 31 and the abutting portion 113 of the pole 11 are welded together by laser welding to realize electrical connection, the winding core 3 extends out a second tab at the other end, the second tab is welded together with the bottom of the shell 2 by laser welding to realize electrical connection, the battery cap assembly 1 is capped at the end of the shell 2, and the battery cap assembly 1 and the shell 2 are welded together by laser welding to seal the winding core 3 in the shell 2. The battery has stable structure, good sealing performance and high reliability.

[0038] According to the third embodiment of the present application, an electronic device is provided, which uses the battery as above to provide stable energy for the electronic device to work normally.

[0039] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0041] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A battery cap assembly, characterized by, The pole includes a pole, a sealing member embedded in the pole, a cap sleeved on the pole, and a locking member locked with the pole; the locking member is locked to make the pole and the cap tightly fit; the end of the pole is provided with a blind hole, and the sealing member is embedded in the blind hole to make the blind hole expand and deform.

2. The battery cap assembly of claim 1, wherein, The pole includes a convex portion and an abutting portion, the cap is provided with a through hole in the middle, the convex portion passes through the through hole and is locked with the locking member, and the abutting portion abuts with the lower surface of the cap.

3. The battery cap assembly of claim 2, wherein, The outer periphery of the convex portion is provided with a thread, and the locking member is a nut matched with the thread.

4. The battery cap assembly of claim 3, wherein, The outer periphery of the abutting portion is outwardly convex and helical, and the helical direction is consistent with the direction of the thread.

5. The battery cap assembly of claim 2, wherein, The blind hole is located at the center of the convex portion, the sealing member is a spherical sealing member, and the diameter of the sealing member is greater than the hole diameter of the blind hole.

6. The battery cap assembly of claim 2, wherein, The cap includes a cap piece and an insulating member, the outer periphery of the insulating member is provided with an annular groove, the cap piece is embedded on the annular groove, and the abutting portion abuts with the lower surface of the insulating member.

7. The battery cap assembly of claim 6, wherein, The end of the insulating member away from the abutting portion is provided with a cavity, and the locking member is located in the cavity.

8. A battery comprising a housing, and a jellyroll nested within the housing, characterized in that, The battery cap assembly of any one of claims 1-7 is further included, and the battery cap assembly is sealed on the end of the shell to seal the roll core in the shell.

9. The battery of claim 8, wherein, The roll core includes a first tab, and the first tab is electrically connected with the pole.

10. An electronic device, comprising: The electronic device includes the battery of claim 8 or 9.

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