A guide pin composite button battery

Abstract

The present invention belongs to the technical field of lithium-ion batteries, and specifically relates to a guide pin composite button battery, including an electrode assembly, a shell, a gasket, a seal and a conductive member. The shell is used to accommodate the electrode assembly, and the shell is provided with at least one lead-out hole; the gasket is provided with a through hole; the seal is used to fix the gasket and the shell, and the seal is provided with an air-avoiding hole; the conductive member is electrically connected to the electrode assembly, passes through the lead-out hole, the air-avoiding hole and the through hole in sequence, and is welded to the gasket, and the conductive member is used to be electrically connected to an external circuit. The gasket is fixedly connected to the shell through the seal to complete the sealing. Since the seal does not need to be mechanically squeezed, a gasket with a thinner thickness can be used to seal with the seal, thereby increasing the energy density of the battery, and avoiding deformation of the shell caused by riveting, which affects the yield rate of the battery. After the conductive member passes through the through hole, it is welded to the gasket. The gasket can fix the conductive member and further enhance the sealing performance of the through hole.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a guide pin composite button battery. Background Art

[0002] Nowadays, with the rapid growth of population and the rapid development of social economy, resources and energy are becoming increasingly scarce, environmental protection is increasingly valued, and energy development and conservation have become an important issue in today's world. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection.

[0003] During the assembly of conventional hard-shell lithium-ion batteries, the positive and negative tabs of the battery cell need to be connected to the positive and negative polarity parts of the metal shell, respectively. At the same time, the hard-shell lithium-ion battery needs to be welded with metal sheets at the positive and negative polarities corresponding to the shell, and connected to the external circuit through the welded metal sheets. Such a connection process will lead to more complicated process steps and increase the connection resistance of the battery to a certain extent, which is not conducive to the application of high-power occasions.

[0004] In order to simplify the connection process between the battery cell and the external circuit, the existing hard-shell lithium-ion battery leads the positive and negative ears of the electrode assembly directly to the outside of the shell through the through holes set in the shell, and then completes the sealing of the through hole by extruding and riveting the sealing ring set in the through hole to form a sealing structure. However, the riveted sealing method will make the total thickness of the sealing structure 4mm, which accounts for a large proportion of the overall thickness of the battery. At the same time, due to the small thickness of the battery shell, riveting can easily damage the shell, and the riveted sealing ring can easily cause the battery to leak. Summary of the invention

[0005] The purpose of the present invention is to provide a guide pin composite button battery to address the deficiencies of the prior art, simplify the assembly of the battery, and improve the utilization rate of the battery in the spatial structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The present invention discloses a guide pin composite button battery, comprising:

[0008] Electrode assembly;

[0009] A shell, used to accommodate the electrode assembly, the shell being provided with at least one lead-out hole;

[0010] A gasket is provided with a through hole;

[0011] A sealing member, used for fixing and connecting the gasket and the housing, and the sealing member is provided with an air avoidance hole;

[0012] The conductive member is electrically connected to the electrode assembly, passes through the lead-out hole, the air avoidance hole and the through hole in sequence, and is welded to the gasket. The conductive member is used to be electrically connected to an external circuit.

[0013] Preferably, the shell is provided with two lead-out holes; the shell includes a shell and a cover body sealedly connected to the shell, and the shell includes a bottom wall and a side wall; wherein the two lead-out holes are both arranged on the cover body; or the two lead-out holes are both arranged on the bottom wall; or one of the two lead-out holes is arranged on the cover body, and the other is arranged on the bottom wall.

[0014] By arranging the two lead-out holes at different positions of the outer shell, the battery can be adapted to different power usage scenarios, thereby increasing the applicable range of the battery. At the same time, two conductive parts electrically connected to the positive and negative plates respectively can be led out through the two lead-out holes, thereby enabling the battery to form an effective current circuit.

[0015] Preferably, the housing is provided with a recess, the lead-out hole passes through the recess, and the gasket is fixedly connected to the recess via a sealing member.

[0016] Preferably, the electrode assembly includes a first electrode piece, a second electrode piece and a diaphragm for isolating the first electrode piece from the second electrode piece, and the two conductive members are respectively welded to the empty foil areas arranged on the first electrode piece and the second electrode piece.

[0017] Preferably, the two conductive members have different lengths.

[0018] Preferably, the conductive part includes a welding part and a connecting part, which are integrally formed, the welding part is sheet-shaped, and the connecting part is columnar, the welding part is used to weld to the empty foil area, and the connecting part is used to electrically connect to an external circuit, and the connecting part passes through the lead-out hole, the air avoidance hole and the through hole in sequence, and is welded to the gasket.

[0019] Preferably, the gasket is provided with a flange in the through hole, the flange extends and bulges in a direction away from the electrode assembly, the diameter of the through hole decreases in the direction where the flange extends and bulges, and the connecting portion passes through the through hole and is welded to the flange.

[0020] Preferably, the diameter of the connecting portion is larger than the diameter of the through hole, and the connecting portion and the through hole are interference fit.

[0021] Preferably, the interference between the connecting portion and the through hole is 0.01-0.1 mm.

[0022] Preferably, the melting point of the sealing member is 130°C to 150°C.

[0023] The present invention has at least the following beneficial effects: the conductive member passes through the lead-out hole, the air-avoiding hole and the through hole in sequence and is led out to the outside of the shell, so that it can be used to be electrically connected to the external circuit without welding the metal connecting piece of the shell, reducing the manufacturing process of the battery, improving the production efficiency of the battery, and improving the utilization rate of the space structure of miniaturized electronic products. At the same time, because the conductive member does not need to weld the metal connecting piece of the shell, it is directly used to be electrically connected to the external circuit, thereby reducing the internal resistance of the battery. Compared with the sealing structure formed by extruding and riveting the seal, the gasket, the seal and the shell of the present application are stacked in sequence, and the gasket and the shell are fixedly connected by the seal to complete the sealing. Since the seal does not need to be mechanically extruded, a thinner gasket and seal can be used for sealing, thereby increasing the energy density of the battery. For example, the thickness of the sealing structure is 0.3-0.6mm, and the strength of the sealing structure will not be affected. At the same time, the button battery is a small energy storage element, so the thickness of the shell is thin, which is easy to cause the shell to deform during riveting, affecting the yield rate of the battery. The conductive member is welded to the gasket after passing through the through hole. The gasket can fix the conductive member and further enhance the sealing performance of the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the guide pin composite button battery implemented in embodiment 1 of the present invention.

[0026] Figure 2 It is a cross-sectional view of the guide pin composite button battery of embodiment 1 of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the guide pin composite button battery implemented in embodiment 2 of the present invention.

[0028] Figure 4 It is a cross-sectional view of the guide pin composite button battery of embodiment 2 of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the guide pin composite button battery implemented in embodiment 3 of the present invention.

[0030] Figure 6 It is a cross-sectional view of the guide pin composite button battery of embodiment 3 of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the guide pin composite button battery implemented in embodiment 4 of the present invention.

[0032] Figure 8 It is a cross-sectional view of the guide pin composite button battery of embodiment 4 of the present invention.

[0033] Fig. 9 FIG. 4 is a schematic diagram of a three-dimensional structure of a conductive member according to an embodiment of the present invention.

[0034] Fig.10 FIG. 4 is a schematic diagram of welding a conductive member and a first pole piece according to an embodiment of the present invention.

[0035] Fig.11 It is a schematic diagram of the exploded assembly of the cover body, the sealing member and the conductive member in Example 1 of the present invention.

[0036] The reference numerals are described as follows:

[0037] 1-electrode assembly; 11-first pole piece; 12-second pole piece; 13-diaphragm; 14-empty foil area; 2-housing; 20-lead-out hole; 21-cover; 22-shell; 221-bottom wall; 222-side wall; 23-recess; 3-gasket; 30-through hole; 31-flange; 4-seal; 40-avoidance hole; 5-conductive member; 51-connecting part; 52-welding part; 6-explosion-proof pattern. DETAILED DESCRIPTION

[0038] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0039] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0040] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0041] The present invention is further described in detail below with reference to the accompanying drawings, but is not intended to limit the present invention.

[0042] Example 1

[0043] like Figure 1 to Figure 2 and Figures 9 to 11 As shown, the guide pin composite button battery of this embodiment includes: an electrode assembly 1, a shell 2, a gasket 3, a sealing member 4 and a conductive member 5. The shell 2 is used to accommodate the electrode assembly 1, and the shell 2 is provided with at least one lead-out hole 20; the gasket 3 is provided with a through hole 30; the sealing member 4 is used to fix the gasket 3 and the shell 2, and the sealing member 4 is provided with an air avoidance hole 40; the conductive member 5 is electrically connected to the electrode assembly 1, passes through the lead-out hole 20, the air avoidance hole 40 and the through hole 30 in sequence, and is welded to the gasket 3, and the conductive member 5 is used to be electrically connected to an external circuit.

[0044] This embodiment has at least the following beneficial effects: the conductive member 5 passes through the lead-out hole 20, the air-avoiding hole 40 and the through hole 30 in sequence, and is led out to the outside of the housing 2, so that it can be used for electrical connection with the external circuit without welding the metal connecting piece of the housing 2, thereby reducing the manufacturing process of the battery, improving the production efficiency of the battery, and improving the utilization rate of the space structure of miniaturized electronic products. At the same time, because the conductive member 5 does not need to weld the metal connecting piece of the housing 2, it is directly used for electrical connection with the external circuit, thereby reducing the internal resistance of the battery. Compared with the sealing structure formed by extruding and riveting the seal 4, the gasket 3, the seal 4 and the housing 2 of the present application are stacked in sequence, and the gasket 3 and the housing 2 are fixedly connected by the seal 4 to complete the sealing. Since the seal 4 does not need to be mechanically extruded, a thinner gasket 3 and the seal 4 can be used for sealing, thereby increasing the energy density of the battery. If the thickness of the sealing structure is 0.3-0.6mm, it will not affect the strength of the sealing structure. At the same time, the button battery is a small energy storage element, so the thickness of the shell 2 is relatively thin, which can easily cause the shell 2 to deform during riveting, affecting the yield rate of the battery.

[0045] Preferably, the gasket 3 and the seal 4 are both in sheet shape, wherein the gasket 3 and the seal 4 can be in a circular, square, diamond, etc. shape, thereby reducing the space occupied by the gasket 3 and the seal 4 in the battery.

[0046] Preferably, the through hole 30 of the gasket 3 , the air avoidance hole 40 of the sealing member 4 and the lead-out hole 20 of the housing 2 are coaxial, so as to facilitate the conductor 5 to be led out of the housing 2 .

[0047] Preferably, the housing 2 is provided with two outlet holes 20; the housing 2 comprises a shell 22 and a cover 21 sealedly connected to the shell 22, the shell 22 comprises a bottom wall 221 and a side wall 222; wherein the two outlet holes 20 are both provided on the cover 21. Further, the two outlet holes 20 are evenly distributed on the cover 21.

[0048] It should be noted that the cover body 21 is covered on the shell 22, and the laser penetrates and welds the shell 22 along the edge of the cover body 21, thereby completing the sealed connection between the cover body 21 and the shell 22. The bottom wall 221 and the side wall 222 of the shell 22 can be integrally formed, or the side wall 222 can be welded to the bottom wall 221. The material of the shell 22 and the cover body 21 is the metal commonly used in existing hard shell batteries, such as stainless steel, aluminum, aluminum alloy, etc. The cross-sectional shape of the outer shell 2 includes but is not limited to other structures such as square, circular, elliptical, and special-shaped, and is circular in the present embodiment. Among them, the bottom wall 221 or the cover body 21 can be laser engraved with an explosion-proof pattern 6. When the battery is thermally runaway, the internal air pressure of the battery can break through the explosion-proof pattern 6 for pressure relief.

[0049] Preferably, the electrode assembly 1 includes a first electrode piece 11, a second electrode piece 12 and a diaphragm 13 for isolating the first electrode piece 11 from the second electrode piece 12, and the two conductive members 5 are welded to the empty foil areas 14 provided on the first electrode piece 11 and the second electrode piece 12, respectively.

[0050] A conductive member 5 is welded to the empty foil area 14 of the first electrode 11, so that the conductive member 5 has the polarity of the first electrode 11. A conductive member 5 is welded to the empty foil area 14 of the second electrode 12, so that the conductive member 5 has the polarity of the second electrode 12. Since the conductive member 5 is electrically connected to the external circuit, the conductive member 5 serves as a window for the electrode assembly 1 to exchange energy with the external circuit.

[0051] Specifically, any one of the first pole piece 11 and the second pole piece 12 is a positive pole piece, and the other is a negative pole piece. The electrode assembly 1 is formed by winding the first pole piece 11, the diaphragm 13 and the second pole piece 12. When the active material slurry is coated on the current collectors of the first pole piece 11 and the second pole piece 12, by leaving any section of the current collector area without coating the active material slurry, the current collector area not coated with the active material slurry is made into an empty foil area 14, and the conductive member 5 is ultrasonically welded to the empty foil area 14 to complete the electrical connection between the conductive member 5 and the pole piece, and the first pole piece 11 welded with the conductive member 5 and the second pole piece 12 are isolated by the diaphragm 13 and wound to form the electrode assembly 1. In this embodiment, the two conductors are led out from the same end of the electrode assembly 1.

[0052] Preferably, the two conductive members 5 have different lengths.

[0053] The lengths of the two conductive members 5 are set to be different. When the conductive members 5 are welded to the empty foil area 14, the conductive members 5 of different lengths can be welded to the first pole piece 11 and the second pole piece 12 respectively, so that the conductive members 5 of different lengths have different polarities. After the first pole piece 11, the diaphragm 13 and the second pole piece 12 are wound into the electrode assembly 1, the polarity of the conductive member 5 can be quickly distinguished by the conductive members 5 of different lengths, so as to facilitate the electrical connection between the battery and the external circuit. For example, the long conductive member 5 is welded to the positive pole piece, and the short conductive member 5 is welded to the negative pole piece, then the long conductive member 5 is the positive pole, and the short conductive member 5 is the negative pole.

[0054] Preferably, the conductive member 5 includes a welding portion 52 and a connecting portion 51, the welding portion 52 and the connecting portion 51 are integrally formed, the welding portion 52 is sheet-shaped, the connecting portion 51 is columnar, the welding portion 52 is used to weld to the empty foil area 14, the connecting portion 51 is used to electrically connect to an external circuit, the connecting portion 51 passes through the lead-out hole 20, the air avoidance hole 40 and the through hole 30 in sequence, and is welded to the gasket 3.

[0055] Since the electrode assembly 1 is formed by winding the first electrode sheet 11, the diaphragm 13 and the second electrode sheet 12, by setting the welding portion 52 to be sheet-shaped and ultrasonically welding the sheet-shaped welding portion 52 to the empty foil area 14, it will not affect the force-bearing structure of the wound electrode assembly 1, thereby avoiding damage to the electrode assembly 1.

[0056] Preferably, the diameter of the connecting portion 51 is greater than the diameter of the through hole 30 , and the connecting portion 51 and the through hole 30 are interference fit.

[0057] The conductive member 5 can be made of aluminum or copper. Since aluminum and copper have lower hardness, when the connecting portion 51 passes through the through hole 30, since the diameter of the connecting portion 51 is larger than the diameter of the through hole 30, the connecting portion 51 will be deformed, so that the conductive member 5 can pass through the through hole 30. Due to the interference fit between the connecting portion 51 and the through hole 30, the connecting portion 51 and the housing 2 at the through hole 30 are in close contact, so that a sealing effect can be achieved, further improving the sealing performance of the battery at the through hole 30.

[0058] Preferably, the interference between the connecting portion 51 and the through hole 30 is 0.01-0.1 mm.

[0059] Since the connecting portion 51 will deform in the process of passing through the through hole 30, it will be more difficult for the conductive member 5 to pass through the through hole 30. Therefore, the interference fit between the connecting portion 51 and the through hole 30 needs to be limited to 0.01-0.1 mm, so as to ensure that the conductive member 5 can pass through the through hole 30 when it is slightly deformed, thereby preventing the conductive member 5 from being unable to pass through the through hole 30 even when the deformation amount reaches the limit.

[0060] Preferably, the melting point of the sealing member 4 is 130°C to 150°C.

[0061] The seal 4 can be made of insulating materials that melt at a temperature of 130°C to 150°C, such as polyethylene, polyoxymethylene, polypropylene, etc. When the battery has thermal runaway, the temperature and air pressure inside the battery will rise. When the temperature rises to 130°C, the seal 4 begins to melt, and the connection structure between the gasket 3, the seal 4 and the housing 2 is destroyed. The gas inside the battery is discharged before the battery is heated to a dangerous temperature, thereby achieving a pressure relief effect.

[0062] Example 2

[0063] like Figure 3 and Figure 4 As shown, different from Example 1, the gasket 3 of this embodiment is provided with a flange 31 in the through hole 30, and the flange 31 extends and protrudes in the direction away from the electrode assembly 1, and the diameter of the through hole 30 decreases in the direction in which the flange 31 extends and protrudes, and the connecting portion 51 passes through the through hole 30 and is welded to the flange 31.

[0064] The conductive member 5 is located on the side of the gasket 3 facing the electrode assembly 1, so when the conductive member 5 passes through the through hole 30, it will reach the side of the gasket 3 away from the electrode assembly 1 from the side of the gasket 3 facing the electrode assembly 1. Since the flange 31 extends and bulges in the direction away from the electrode assembly 1, and the through hole 30 decreases in the direction of the flange 31 extending and bulging, the shape of the flange 31 is the same as that of the horn. In the process of the conductive member 5 passing through the through hole 30, the flange 31 can guide the conductive member 5 to pass through the through hole 30. The conductive member 5 will enter from the large opening of the flange 31 and then exit from the small opening of the flange 31, so that the conductive member 5 passes through the through hole 30, reducing the difficulty of the conductive member 5 passing through the through hole 30. At the same time, since the flange 31 extends and bulges in the direction away from the electrode assembly 1, the laser welding is performed on the connecting portion 51 and the flange 31, and the position of the laser welding can be at a certain distance from the sealing member 4, thereby reducing the influence of the heat of the laser welding on the sealing member 4. Since the flange 31 is laser welded to the connecting portion 51, the sealing performance of the battery is further improved.

[0065] Example 3

[0066] like Figure 5 and Figure 6 As shown, different from the first embodiment, the housing 2 of the present embodiment is provided with a recess 23 , the lead-out hole 20 passes through the recess 23 , and the gasket 3 is fixedly connected to the recess 23 via a sealing member 4 .

[0067] When the gasket 3 is fixedly connected to the outer shell 2 through the seal 4, the thickness of the gasket 3 and the seal 4 will increase the overall height of the battery, affecting the energy density of the battery. The gasket 3 is fixedly connected to the recess 23 through the seal 4, so that the gasket 3 and the seal 4 can be embedded in the outer shell 2, thereby reducing the influence of the thickness of the gasket 3 and the seal 4 on the overall height of the battery and improving the energy density of the battery. At the same time, since the fixed connection method of the gasket 3, the seal 4 and the outer shell 2 includes but is not limited to hot pressing, sticking insulating tape and applying insulating glue, the recess 23 can also limit the displacement of the gasket 3 and the seal 4 when the fixed connection is performed, so that the gasket 3 and the seal 4 can be accurately fixed to the outer shell 2.

[0068] Optionally, the depth of the recess 23 may be 2 / 3 of the thickness of the bottom wall 221 or the cover 21, thereby ensuring the structural strength of the bottom wall 221 or the cover 21 while more effectively eliminating the influence of the thickness of the gasket 3 and the seal 4 on the overall height of the battery. The recess 23 may be formed by stamping the bottom wall 221 and the cover 21.

[0069] It should be noted that the shape of the recess 23 is not specifically limited in this embodiment. Considering that the recess 23 is used to eliminate the thickness of the seal 4 and the gasket 3, the recess 23 can be set to a shape that matches the seal 4. For example, if the seal 4 is annular, the recess 23 can be set to a circular shape; if the seal 4 is a square ring, the recess 23 can be set to a square shape. Because the gasket 3 is welded to the conductive member 5, the gasket 3 is charged, so in order to avoid a short circuit in the battery, the area of ​​the gasket 3 is set to be smaller than the area of ​​the recess 23.

[0070] Example 4

[0071] like Figure 7 and Figure 8 As shown, different from Example 1, the shell 2 of this embodiment is provided with a recess 23, the lead-out hole 20 passes through the recess 23, the gasket 3 is fixedly connected to the recess 23 by the sealing member 4, the gasket 3 is provided with a flange 31 in the through hole 30, the flange 31 extends and protrudes in the direction away from the electrode assembly 1, the diameter of the through hole 30 decreases in the direction in which the flange 31 extends and protrudes, and the connecting portion 51 passes through the through hole 30 and is welded to the flange 31.

[0072] The other structures are the same as those in Example 1 and will not be described again here.

[0073] Example 5

[0074] Different from the embodiment, the two outlet holes 20 of this embodiment are both arranged on the bottom wall 221. The gasket 3 is fixedly connected to the bottom wall 221 through the sealing member 4. Preferably, the two outlet holes 20 are evenly distributed on the bottom wall 221.

[0075] The other structures are the same as those in Example 1 and will not be described again here.

[0076] Example 6

[0077] Different from the first embodiment, one of the two lead-out holes 20 of the present embodiment is provided on the cover 21, and the other is provided on the bottom wall 221. One gasket 3 is fixedly connected to the cover 21 through a seal 4, and the other gasket 3 is fixedly connected to the bottom wall 221 through a seal 4. Accordingly, the welding portions 52 of the two conductive members 5 are led out from different ends of the electrode assembly 1.

[0078] The other structures are the same as those in Example 1 and will not be described again here.

[0079] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement, combination or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A guide pin composite button battery, characterized in that: include: Electrode assembly (1); A housing (2) for accommodating the electrode assembly (1), the housing (2) being provided with at least one lead-out hole (20); A gasket (3) provided with a through hole (30); A sealing member (4) for fixedly connecting the gasket (3) and the housing (2), wherein the sealing member (4) is provided with an air avoidance hole (40); A conductive member (5) is electrically connected to the electrode assembly (1), passes through the lead-out hole (20), the air avoidance hole (40) and the through hole (30) in sequence, and is welded to the gasket (3), wherein the conductive member (5) is used to be electrically connected to an external circuit; The conductive member (5) comprises a welding portion (52) and a connecting portion (51), the welding portion (52) and the connecting portion (51) being integrally formed, the welding portion (52) being sheet-shaped, the connecting portion (51) being column-shaped, the gasket (3) being provided with a flange (31) in the through hole (30), the flange (31) extending and protruding in a direction away from the electrode assembly (1), the diameter of the through hole (30) decreasing in the direction in which the flange (31) extends and protrudes, and the connecting portion (51) passes through the through hole (30) and is welded to the flange (31).

2. The guide pin composite button battery according to claim 1, characterized in that: The housing (2) is provided with two outlet holes (20); the housing (2) comprises a shell (22) and a cover (21) sealed to the shell (22), and the shell (22) comprises a bottom wall (221) and a side wall (222); wherein the two outlet holes (20) are both arranged on the cover (21); or the two outlet holes (20) are both arranged on the bottom wall (221); or one of the two outlet holes (20) is arranged on the cover (21) and the other is arranged on the bottom wall (221).

3. The guide pin composite button battery according to claim 1 or 2, characterized in that: The housing (2) is provided with a recess (23), the lead-out hole (20) passes through the recess (23), and the gasket (3) is fixedly connected to the recess (23) via the sealing member (4).

4. The guide pin composite button battery according to claim 1, characterized in that: The electrode assembly (1) comprises a first pole piece (11), a second pole piece (12) and a diaphragm (13) for isolating the first pole piece (11) from the second pole piece (12), and the two conductive members (5) are respectively welded to empty foil areas (14) provided on the first pole piece (11) and the second pole piece (12).

5. The guide pin composite button battery according to claim 4, characterized in that: The two conductive members (5) have different lengths.

6. The guide pin composite button battery according to claim 4, characterized in that: The welding portion (52) is used for welding with the empty foil area (14), the connecting portion (51) is used for electrically connecting with the external circuit, and the connecting portion (51) passes through the lead-out hole (20), the air avoidance hole (40) and the through hole (30) in sequence, and is welded with the gasket (3).

7. The guide pin composite button battery according to claim 6, characterized in that: The diameter of the connecting portion (51) is greater than the diameter of the through hole (30), and the connecting portion (51) and the through hole (30) are interference fit.

8. The guide pin composite button battery according to claim 7, characterized in that: The interference between the connecting portion (51) and the through hole (30) is 0.01 to 0.1 mm.

9. The guide pin composite button battery according to claim 1, characterized in that: The melting point of the sealing element (4) is 130°C to 150°C.

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