Micro battery

Abstract

The present invention relates to a micro battery, comprising a shell and a battery cell arranged in the shell, wherein the battery cell comprises a first electrode assembly and a second electrode assembly with opposite polarities. The micro battery also comprises an insulating sealing assembly and at least one electrode lead-out body sealingly penetrated through the insulating sealing assembly, each of the electrode lead-out bodies being connected to the first electrode assembly or the second electrode assembly and led out to the outside of the shell. The shell comprises an end wall, and the insulating sealing assembly comprises at least one first sealing portion affixed to the end wall, wherein the at least one first sealing portion is formed with at least one first through-hole for the at least one electrode lead-out body to penetrate. The structural configuration of the insulating sealing assembly can greatly reduce the stacking height of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly to a micro battery. Background Art

[0002] Micro batteries are small and high energy density batteries that are widely used in various aspects of life, such as electronic watches, Bluetooth headsets, hearing aids and other small portable electronic devices. How to reduce the structural size of the battery and improve its space utilization is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an improved micro battery in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is: constructing a micro battery, including a shell and a battery cell arranged in the shell, the battery cell including a first electrode assembly and a second electrode assembly with opposite polarities; the micro battery also includes an insulating sealing assembly and at least one electrode lead-out body sealedly passed through the insulating sealing assembly, each of the electrode lead-out bodies is connected to the first electrode assembly or the second electrode assembly and led to the outside of the shell; the shell includes an end wall, the insulating sealing assembly includes at least one first sealing portion attached to the end wall, and the at least one first sealing portion is formed with at least one first through-hole for the at least one electrode lead-out body to pass through.

[0005] In some embodiments, the first sealing portion is formed by stacking at least two insulating layers.

[0006] In some embodiments, the insulating layer is in sheet form, and the thickness of each insulating layer is 0.02-1 mm.

[0007] In some embodiments, the at least two insulating layers are made of the same or different materials.

[0008] In some embodiments, the insulating layer is made of at least one of plastic, rubber, TPE, ceramic, and glass.

[0009] In some embodiments, the insulating layer in contact with the end wall and / or the electrode lead-out body among the at least two insulating layers is made of soft insulating material.

[0010] In some embodiments, at least one lead-out hole is provided on the end wall, and the insulating sealing assembly further comprises at least one second sealing portion penetrating through the at least one lead-out hole, wherein the at least one second sealing portion is formed with at least one second through-hole for penetrating the at least one electrode lead-out body.

[0011] In some embodiments, the at least one second sealing portion is integrated with the at least one first sealing portion, or the at least one second sealing portion and the at least one first sealing portion are separately provided.

[0012] In some embodiments, the end wall is conductive, the first electrode assembly is electrically connected to the at least one electrode lead-out body, and the second electrode assembly is electrically connected to the end wall.

[0013] In some embodiments, the microbattery includes at least two electrode lead-out bodies, and the at least two electrode lead-out bodies are electrically connected to the first electrode assembly and the second electrode assembly, respectively.

[0014] In some embodiments, the outer shell further comprises a cylindrical lower shell, the end wall is in a flat plate shape and covers the opening of the lower shell, and the outer periphery of the end wall is sealed and combined with the edge of the opening of the lower shell.

[0015] The microbattery implementing the present invention has at least the following beneficial effects: the structural configuration of the insulating sealing assembly can greatly reduce the stacking height of the battery; in addition, the electrode lead-out body can be directly connected to the terminal device, thereby reducing the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic diagram of the longitudinal cross-sectional structure of a micro battery in the first embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the middle insulating sealing component;

[0019] Figure 3 yes Figure 2 A schematic diagram of a cross-sectional exploded structure of the insulating seal assembly shown;

[0020] Figure 4 The first sealing portion in an alternative embodiment of the present invention

[0021] Figure 5 is a schematic diagram of a longitudinal cross-sectional structure of a microbattery in a second embodiment of the present invention;

[0022] Figure 6 4 is a schematic diagram of the longitudinal cross-sectional structure of a micro battery in the third embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0024] In the description of the present invention, it should be understood that the terms "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings or the positions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present technical solution, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "vertical", "horizontal", "longitudinal", "lateral" and similar expressions used in the present invention are for illustrative purposes only and do not represent the only implementation method.

[0025] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0026] Figure 1-3 The micro battery 1 in the first embodiment of the present invention is shown, and the micro battery 1 may be a lithium ion button battery, which may be roughly in the shape of a flat cylinder. It can be understood that in other embodiments, the micro battery 1 may also be in other shapes such as a square column, an elliptical column, etc.

[0027] The micro battery 1 may include a housing 10, a battery cell 20, an insulating sealing component 30, and an electrode lead-out body 40. The battery cell 20 is disposed in the housing 10 and may be coaxially disposed with the housing 10, and may include a first electrode assembly 21, a second electrode assembly 22, and an isolation component 23 disposed between the first electrode assembly 21 and the second electrode assembly 22 to insulate and isolate the first electrode assembly 21 and the second electrode assembly 22. The polarities of the first electrode assembly 21 and the second electrode assembly 22 are opposite, for example, the first electrode assembly 21 is a negative electrode and the second electrode assembly 22 is a positive electrode; or, the first electrode assembly 21 is a positive electrode and the second electrode assembly 22 is a negative electrode. The electrode lead-out body 40 has a first end and a second end disposed oppositely, and the first end is connected to the first electrode assembly 21. The second end is led to the outside of the housing 10 and may leak out of the insulating sealing component 30, so that it can be directly or indirectly connected to a terminal device. The insulating sealing component 30 is sealedly coated on the outside of the electrode lead-out body 40, and the electrode lead-out body 40 is insulated and isolated from the housing 10.

[0028] In some embodiments, the battery cell 20 may be made in the form of a spiral winding. The first electrode assembly 21, the second electrode assembly 22, and the isolation assembly 23 may respectively include at least one first conductive sheet, at least one second conductive sheet, and at least one insulating isolation sheet. After the first conductive sheet, the insulating isolation sheet, and the second conductive sheet are stacked in sequence and wound around a round rod-shaped winding core, the winding core is pulled out to form a battery cell hole 24 whose central axis coincides with the central axis of the battery cell 20. In other embodiments, the battery cell 20 may also be made in the form of a stack.

[0029] The housing 10 may be roughly in the shape of an oblate cylinder. In some embodiments, the height of the housing 10 may be 0.1-0.9 times, for example, 0.25-0.7 times, of its outer diameter. The housing 10 may be made of a conductive material such as metal, and may be electrically connected to the second electrode assembly 22. The housing 10 has an end wall 121, and a lead-out hole 120 is provided on the end wall 121 for the electrode lead-out body 40 to pass through. The insulating sealing assembly 30 may include a first sealing portion 31 and a second sealing portion 32 connected to the first sealing portion 31, and the first sealing portion 31 and the second sealing portion 32 are respectively formed with a first through hole 310 and a second through hole 320 for the electrode lead-out body 40 to pass through. The first sealing portion 31 may be sealed and fitted with the end wall 121 facing or away from one end face of the battery cell 20. The electrode lead-out body 40 and the insulating sealing assembly 30 can be respectively assembled into the battery as separate components; or, the electrode lead-out body 40 and the insulating sealing assembly 30 can also be combined into one assembly and then assembled into the battery.

[0030] In some embodiments, the first sealing portion 31 may be formed by stacking at least two insulating layers 311. The insulating layer 311 may be in the form of a thin sheet, and the cross-section of the insulating layer 311 may be in a regular or irregular shape such as a circle or a square. The thickness of the at least two insulating layers 311 may be the same or different, and the thickness of each insulating layer 311 may be between 0.02 and 1 mm. The structural configuration of the insulating sealing assembly 30 can minimize the stacking height of the battery.

[0031] The insulating layer 311 is made of insulating material, for example, it can be made of at least one of plastic, rubber, TPE, ceramic, and glass. The materials of the at least two insulating layers 311 constituting the first sealing portion 31 can be the same. In other embodiments, the materials of the at least two insulating layers 311 constituting the first sealing portion 31 can also be different. For example, the at least two insulating layers 311 can be alternately arranged with hard materials and soft materials, so that the first sealing portion 31 has good sealing performance and sufficient hardness. For another example, the insulating layer 311 in contact with the end wall 121 and / or the electrode lead-out body 40 is made of soft material, and the other insulating layers 311 are made of soft or hard materials.

[0032] Specifically, in this embodiment, the first sealing portion 31 is formed by stacking two insulating layers 311. The two insulating layers 311 include a first insulating layer 3111 located at the upper part and a second insulating layer 3112 located at the lower part. The first insulating layer 3111 is sealed and fitted with the end wall 121, and a receiving groove 3101 for receiving the electrode lead-out body 40 and a through hole 3102 for the electrode lead-out body 40 to pass through may be formed on the first insulating layer 3111. The through hole 3102 penetrates the first insulating layer 3111 in the longitudinal direction and is correspondingly connected to the second through hole 320. The receiving groove 3101 extends inwardly from one lateral side of the first insulating layer 3111 to be connected to the through hole 3102. The bottom of the receiving groove 3101 is open, so as to facilitate the placement of the electrode lead-out body 40. The electrode lead-out body 40 can be placed into the receiving groove 3101 through the bottom opening of the receiving groove 3101, and the second end of the electrode lead-out body 40 passes through the through hole 3102. The second insulating layer 3112 is sealed and fitted with the first insulating layer 3111, so that the electrode lead-out body 40 is clamped and fixed between the second insulating layer 3112 and the first insulating layer 3111, and the bottom of the receiving groove 3101 and the through hole 3102 are sealed.

[0033] The second sealing part 32 is made of insulating material, for example, it can be made of at least one of plastic, rubber, TPE, ceramic, and glass. The second sealing part 32 is arranged in the lead-out hole 120, and it can be integrated with the first sealing part 31, or it can be separated from the first sealing part 31. The outer peripheral surface of the second sealing part 32 can be sealed with the hole wall of the lead-out hole 120 to seal the lead-out hole 120. In other embodiments, a gap can also be formed between the outer peripheral surface of the second sealing part 32 and the hole wall of the lead-out hole 120, and the lead-out hole 120 is closed by the fitting seal between the first sealing part 31 and the end wall 121. The lower end surface of the second sealing part 32 fits with the upper end surface of the first sealing part 31, and the upper end surface of the second sealing part 32 can be flush with the upper end surface of the end wall 121. In other embodiments, the upper end surface of the second sealing part 32 can also protrude from the upper end surface of the end wall 121.

[0034] The electrode lead-out body 40 may be in a regular or irregular shape such as a sheet or a column, and may be rigid or flexible. The electrode lead-out body 40 is disposed in the at least two insulating layers 311 , and the surface of the electrode lead-out body 40 is sealed and combined with the surface of the insulating layer 311 .

[0035] In some embodiments, the housing 10 may include a cylindrical lower shell 11 having an opening at the upper end and an upper shell 12 sealingly covering the opening at the upper end of the lower shell 11. The outer diameter of the lower shell 11 may be 4.5 to 40 mm, preferably 6 to 30 mm. The thickness of the lower shell 11 may be 0.1 to 1 mm, preferably 0.13 to 0.35 mm. The upper shell 12 may be in the shape of a circular flat plate, and its outer periphery is sealed together with the opening edge of the lower shell 11. Furthermore, the upper shell 12 and the lower shell 11 may be made of laser-weldable materials such as stainless steel, aluminum, and iron, and the outer periphery of the upper shell 12 may be sealed together with the opening edge of the lower shell 11 by laser welding.

[0036] The end wall 121 may be formed on the upper shell 12, and the lead-out hole 120 may penetrate the end wall 121 in the longitudinal direction and may be coaxially arranged with the end wall 121. In other embodiments, the end wall 121 may also be formed on the lower shell 11, and the central axis of the lead-out hole 120 may also be staggered with the central axis of the end wall 121. The first sealing portion 31 is sealed and fitted together with an end surface of the end wall 121 facing the battery cell 20. The first through hole 310 extends inwardly from one lateral side of the first sealing portion 31 to communicate with the second through hole 320. The second through hole 320 extends in the longitudinal direction and may be perpendicular to the first through hole 310.

[0037] The first end of the electrode lead-out body 40 may be connected to the upper end of the first electrode assembly 21 away from the battery cell hole 24. The end of the first through hole 310 away from the second through hole 320 may extend in the lateral direction to the vicinity of the connection point between the electrode lead-out body 40 and the first electrode assembly 21. The electrode lead-out body 40 sealably passes through the first through hole 310 and the second through hole 320 in sequence and leads to the outside of the housing 10 and the insulating sealing assembly 30, and the outer surface of the electrode lead-out body 40 seals and cooperates with the hole walls of the first through hole 310 and the second through hole 320, respectively.

[0038] The micro battery 1 may further include a conductive connector 50 for electrically connecting the second electrode assembly 22 to the housing 10. The conductive connector 50 may be mounted on the bottom wall of the lower housing 11 and may be welded and fixed to the lower housing 11. The lower end of the second electrode assembly 22 away from the battery cell hole 24 may be welded and connected to the conductive connector 50.

[0039] It can be understood that in other embodiments, the number of electrode lead-out bodies 40, first sealing parts 31, second sealing parts 32, and lead-out holes 120 is not limited to one, and two or more may also be applicable. When there are two or more electrode lead-out bodies 40, the two or more electrode lead-out bodies 40 may be electrically connected to the first electrode assembly 21 and the second electrode assembly 22, respectively; or, the two or more electrode lead-out bodies 40 may be electrically connected to the first electrode assembly 21, and the housing 10 may be electrically connected to the second electrode assembly 22.

[0040] Figure 4 The first sealing part 31 in an alternative solution of the present invention is shown. The main difference between the first embodiment and the first embodiment is that in the present embodiment, the first sealing part 31 is formed by stacking three insulating layers 311. The three insulating layers 311 include a first insulating layer 3111 located at the upper part, a second insulating layer 3112 located at the middle part, and a third insulating layer 3113 located at the lower part. The first insulating layer 3111 is sealed and fitted with the end wall 121. A through hole 3102 for the electrode lead body 40 to pass through is formed in the longitudinal direction on the first insulating layer 3111. The through hole 3102 is correspondingly arranged and connected with the second through hole 320. A lateral side of the second insulating layer 3112 is formed with a receiving groove 3101 connected with the through hole 3102 extending inwardly in the lateral direction. The receiving groove 3101 can penetrate the second insulating layer 3112 in the thickness direction. After the electrode lead body 40 is placed in the receiving groove 3101, the first insulating layer 3111 and the third insulating layer 3113 are respectively attached to the two sides of the second insulating layer 3112, so as to clamp and seal the electrode lead body 40, and seal the receiving groove 3101 and the via 3102.

[0041] Figure 5The microbattery 1 in the second embodiment of the present invention is shown, and the main difference between the microbattery 1 in the second embodiment and the first embodiment is that in the second embodiment, the first sealing portion 31 is sealed and attached to the end surface of the end wall 121 facing away from the battery cell 20. The external cross-sectional shape and size of the first sealing portion 31 can be matched with the external cross-sectional shape and size of the end wall 121. In addition, in the second embodiment, the electrode lead-out body 40 can be led out from the upper end of the first electrode assembly 21 close to the lead-out hole 120.

[0042] Figure 6 The micro battery 1 in the third embodiment of the present invention is shown. The main difference between the micro battery 1 in the third embodiment and the first embodiment is that in the third embodiment, the number of the electrode lead-out bodies 40, the second sealing part 32 and the lead-out hole 120 are two. Specifically, the two electrode lead-out bodies 40 can be electrically connected to the first electrode assembly 21 and the second electrode assembly 22 respectively, and the two electrode lead-out bodies 40 can be respectively led out from the upper ends of the first electrode assembly 21 and the second electrode assembly 22 away from the battery cell hole 24. There is one first sealing part 31, and two first through holes 310 are formed on the first sealing part 31, respectively for the two electrode lead-out bodies 40 to pass through in a sealed manner. Two lead-out holes 120 are provided on the end wall 121, and the two second sealing parts 32 are respectively arranged in the two lead-out holes 120, and the two electrode lead-out bodies 40 are respectively led out of the housing 10 through the two second sealing parts 32. In addition, in the third embodiment, the housing 10 can be made of conductive materials such as metal, or can be made of insulating materials such as plastic.

[0043] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0044] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A micro battery, comprising a housing (10) and a battery cell (20) disposed in the housing (10), wherein the battery cell (20) comprises a first electrode assembly (21) and a second electrode assembly (22) having opposite polarities; characterized in that: The microbattery further comprises an insulating sealing component (30) and at least one electrode lead-out body (40) sealingly disposed through the insulating sealing component (30), each of the electrode lead-out bodies (40) being connected to the first electrode component (21) or the second electrode component (22) and being led out to the outside of the housing (10); the housing (10) comprises an end wall (121), the end wall (121) being provided with at least one lead-out hole (120), the insulating sealing component (30) comprising at least one first sealing portion abutting against the end wall (121) (31) and at least one second sealing portion (32) penetrated in the at least one lead-out hole (120), the at least one first sealing portion (31) is formed with at least one first through-hole (310) for the at least one electrode lead-out body (40) to penetrate, the at least one second sealing portion (32) is formed with at least one second through-hole (320) for the at least one electrode lead-out body (40) to penetrate, the first through-hole (310) extends inwardly from one lateral side of the first sealing portion (31) to communicate with the second through-hole (320), The first sealing portion (31) is formed by stacking at least two insulating layers (311), and the electrode lead-out body (40) is clamped and fixed between the at least two insulating layers (311).

2. The microbattery according to claim 1, characterized in that: The insulating layer (311) is in sheet form, and the thickness of each insulating layer (311) is 0.02-1 mm.

3. The microbattery according to claim 1, characterized in that: The materials of the at least two insulating layers (311) are the same or different.

4. The microbattery according to claim 1, characterized in that: The insulating layer (311) is made of at least one of plastic, rubber, TPE, ceramic, and glass.

5. The microbattery according to claim 1, characterized in that: The insulating layer (311) of the at least two insulating layers (311) that is in contact with the end wall (121) and / or the electrode lead-out body (40) is made of a soft insulating material.

6. The microbattery according to claim 1, characterized in that: The at least one second sealing portion (32) is integrated with the at least one first sealing portion (31), or the at least one second sealing portion (32) and the at least one first sealing portion (31) are separable.

7. The microbattery according to any one of claims 1 to 6, characterized in that: The end wall (121) is electrically conductive, the first electrode assembly (21) is electrically connected to the at least one electrode lead-out body (40), and the second electrode assembly (22) is electrically connected to the end wall (121).

8. The microbattery according to any one of claims 1 to 6, characterized in that: The micro battery comprises at least two electrode lead-out bodies (40), and the at least two electrode lead-out bodies (40) are electrically connected to the first electrode assembly (21) and the second electrode assembly (22), respectively.

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