Battery cover plate structure and battery

Abstract

The invention provides a battery cover plate structure. The battery cover plate structure comprises a metal substrate, a cover cap, a thermistor piece and an upper connecting piece, the metal substrate is used for being electrically connected with a battery cell negative electrode, and the lower side of the metal substrate faces the interior of the battery; a first mounting hole is formed in the metal substrate; the cap is used for connecting the positive electrode of the battery cell, arranged in the first mounting hole and connected to the metal substrate in an insulated and sealed manner; the thermistor piece is arranged on the upper side of the metal substrate, and the upper connecting piece is arranged on the upper side of the thermistor piece; the upper connecting piece and the metal substrate are connected or disconnected through the thermistor piece. The thermistor piece is arranged on the upper side of the metal substrate, and when the battery is short-circuited, the internal temperature of the battery is increased, and the resistance of the thermistor piece is increased, so that the battery circuit is disconnected, and the impact of abnormal large current on the battery is prevented; and meanwhile, the upper connecting piece is arranged above the thermistor piece, so that the thermistor piece can be quickly fed back, and the impact of abnormal large current on the battery can be timely protected.

Description

Technical Field

[0001] The present invention relates to the technical field of button batteries, and in particular to a battery cover plate structure and a battery. Background Art Button batteries are smaller batteries that are currently widely used in products such as wireless Bluetooth headsets (TWS). Button batteries usually include a cover structure, a shell, and a battery cell. The battery cell is housed inside the shell, and the cover and the shell are connected to form a battery shell. The existing industry button battery protection solutions mostly use built-in PTC thermistors, or no PTC thermistors; in the solution with built-in PTC thermistors, the PTC thermistor is set in the battery shell and connected to the tabs of the battery cell. When the battery is working, the temperature at the tabs is high, and the thermistor needs to be suitable for a higher trigger temperature, which limits the selection of thermistors, and cannot quickly feedback the abnormally large current of the battery, and cannot timely protect the battery from the impact of abnormally large currents; therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the invention

[0002] In view of the problem that the existing battery cannot make rapid feedback to the high temperature or abnormally large current of the battery and cannot timely protect the battery from the impact of the abnormally large current, the present invention provides a battery cover structure and a battery.

[0003] The technical solution adopted by the present invention to solve the above technical problems is as follows: In one aspect, the present invention provides a battery cover structure, including a metal substrate, a cap, a thermistor sheet and an upper connecting sheet; The metal substrate is used to connect to the battery shell and to electrically connect to the negative electrode of the battery cell. The lower side of the metal substrate is used to face the inside of the battery. A first mounting hole is provided on the metal substrate. The cap is used to connect the positive electrode of the battery cell, the cap is arranged in the first mounting hole, and the cap is insulated and sealed and connected to the metal substrate; The thermistor sheet is arranged on the upper side of the metal substrate, and the upper connecting sheet is arranged on the upper side of the thermistor sheet; the upper connecting sheet and the metal substrate are connected or disconnected through the thermistor sheet.

[0004] Optionally, it further includes a lower connecting piece; the lower connecting piece is arranged on the upper side of the metal substrate and is electrically connected to the metal substrate; The thermistor sheet is arranged on the upper side of the lower connecting sheet; the upper connecting sheet and the lower connecting sheet are connected or disconnected through the thermistor sheet.

[0005] Optionally, the upper connecting sheet, the thermistor sheet and the lower connecting sheet are annular sheets; the annular sheet is sleeved on the cover cap and spaced apart from the cover cap.

[0006] Optionally, it further includes a first insulating ring, which is sleeved on the cap, and the lower connecting piece, the thermistor piece and the upper connecting piece are sleeved on the first insulating ring in sequence.

[0007] Optionally, the upper end of the first insulating ring protrudes from the upper end of the cap; the height of a section of the upper end of the first insulating ring protruding from the upper end of the cap is amm, and the value of a is: 0.2≤a≤0.5.

[0008] Optionally, it also includes a second insulating ring, which is arranged outside the first insulating ring and the second insulating ring cover is arranged on the upper side of the upper connecting plate.

[0009] Optionally, the inner periphery of the second insulating ring is spaced apart from the outer periphery of the first insulating ring; the outer periphery of the second insulating ring, the outer periphery of the upper connecting plate, the outer periphery of the thermistor plate and the outer periphery of the lower connecting plate are located on the same annular surface.

[0010] Optionally, the thickness of the second insulating ring is b mm, and the value of b is: 0.2≤b≤0.7.

[0011] Optionally, a plurality of first notches are arranged on the outer circumference of the upper connecting sheet, and second notches are arranged at positions corresponding to the first notches on the thermistor sheet; the first notches and the corresponding second notches are combined to form a welding clearance notch; The lower connecting piece is connected to the metal substrate via a plurality of first welding portions; the first welding portions are arranged corresponding to the welding clearance notches; and the upper sides of the first welding portions are arranged opposite to the corresponding welding clearance notches.

[0012] Optionally, the first welding portion and the welding clearance notch are arranged in one-to-one correspondence; the first welding portion includes at least one welding point.

[0013] Optionally, the welding clearance notch is C-shaped; the first welding portion includes two welding spots distributed along the circumference of the lower connecting plate, or the first welding portion includes three welding spots distributed in a triangular shape; or, The welding clearance notch is U-shaped; the first welding portion includes two welding spots distributed along the circumference of the lower connecting plate, or the first welding portion includes three welding spots distributed in a triangle, or the first welding portion includes four welding spots distributed in an array.

[0014] Optionally, a third notch is provided on the outer periphery of the upper connecting sheet, a fourth notch is provided on the thermistor sheet at a position corresponding to the third notch, and a fifth notch is provided on the lower connecting sheet at a position corresponding to the fourth notch; The third notch, the fourth notch and the fifth notch are combined to form a fool-proof notch.

[0015] Optionally, the thermistor sheet is a PPTC sheet, and the upper connecting sheet, the thermistor sheet and the lower connecting sheet are connected via a welding portion.

[0016] Optionally, the plurality of welding clearance gaps are respectively a first clearance gap, a second clearance gap and a third clearance gap; The foolproof notch is arranged between the first clearance notch and the third clearance notch; A plurality of the connecting parts are welding parts, including: A second welding portion located between a first side of the foolproof notch and one side of the first clearance notch, a third welding portion located between the other side of the first clearance notch and one side of the second clearance notch, and a fourth welding portion located between the other side of the second clearance notch and the third clearance notch; The thermistor sheet and the upper connecting sheet are connected through the second welding portion, the third welding portion and the fourth welding portion.

[0017] Optionally, the plurality of welding parts further include a fifth welding part, a sixth welding part and a seventh welding part; the thermistor sheet and the lower connecting sheet are connected via the fifth welding part, the sixth welding part and the seventh welding part; The fifth welding portion is located between the third clearance gap and the first clearance gap, the sixth welding portion is located between the first clearance gap and the second clearance gap, the seventh welding portion is located between the second clearance gap and the third clearance gap, the fifth welding portion is staggered with the second welding portion, the sixth welding portion is staggered with the third welding portion, and the seventh welding portion is staggered with the fourth welding portion.

[0018] Optionally, the second welding portion is provided as one and is disposed adjacent to the first clearance notch; The third welding parts are provided in two pieces, and are respectively arranged adjacent to the first clearance notch and the second clearance notch; The fourth welding portion is provided as one, and is provided adjacent to a side of the third clearance notch away from the fool-proof notch; The fifth welding part, the sixth welding part and the seventh welding part are provided as one; The second welding portion, the third welding portion, the fourth welding portion, the fifth welding portion, the sixth welding portion, and the seventh welding portion each include at least one welding point.

[0019] Optionally, at least one of the second welding part, the third welding part, the fourth welding part, the fifth welding part, the sixth welding part and the seventh welding part includes 2-4 welding points.

[0020] Optionally, at least one of the second welding part, the third welding part, the fourth welding part, the fifth welding part, the sixth welding part and the seventh welding part includes three welding points distributed in a triangle, or four welding points distributed in an array.

[0021] Optionally, the distance between the second welding portion and the first clearance notch is cmm, and the value range of c is 0.7-1.5; The third welding portion adjacent to the first clearance notch is at a distance of dmm from the first clearance notch, and the value range of d is 1.0-2.0; The distance between the third welding portion adjacent to the second clearance notch and the second clearance notch is emm, and the value range of e is 0.5-1.5; The distance between the fourth welding portion and the third clearance gap is fmm, and the value range of f is 0.5-1.5.

[0022] Optionally, the angle between two adjacent welding portions is α, and the range of α is 40°≤α≤110°.

[0023] Optionally, the upper connecting plate and the lower connecting plate are respectively made of one of nickel and nickel alloy.

[0024] Another aspect of the present invention provides a button battery, comprising a shell, a battery cell and the battery cover structure as described above, wherein the battery cell is arranged in the shell, and the battery cover structure is sealingly covered on the shell.

[0025] According to the cover plate structure provided by the present invention, by arranging a thermistor sheet on the upper side of the metal substrate, when a short circuit occurs in the battery, the internal temperature of the battery rises, and the resistance of the thermistor sheet increases, thereby disconnecting the battery circuit and protecting the battery from the impact of abnormally large currents; at the same time, by arranging an upper connecting sheet above the thermistor sheet, the thermistor sheet can provide a quick feedback effect, and can timely protect the battery from the impact of abnormally large currents; at the same time, by using the upper connecting sheet as an output component, the formation of an oxide film on the exposed surface of the upper connecting sheet, which causes the contact impedance between the upper connecting sheet and the electrical connector outside the battery to increase, can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a cross-sectional schematic diagram of a battery cover structure provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a battery provided by an embodiment of the present invention; Figure 3 is an exploded schematic diagram of a battery provided by an embodiment of the present invention; Figure 4 is a partial explosion schematic diagram of a battery provided by an embodiment of the present invention; Figure 5 yes Figure 4 A is a partial enlarged schematic diagram; Figure 6 is a top view schematic diagram of the upper connecting piece, thermistor piece and lower connecting piece after being assembled; Figure 7 is a schematic diagram of an assembly process of a battery provided by an embodiment of the present invention; Figure 8 is a labeled schematic diagram of a battery cover structure provided by an embodiment of the present invention; Fig. 9 It is a partial labeled schematic diagram of a battery cover structure provided by an embodiment of the present invention; The reference numerals in the drawings of the specification are as follows: 1-metal substrate; 11-first mounting hole; 2-cap; 21-cap body; 22-eaves; 3-thermistor sheet; 31-second notch; 4-upper connecting sheet; 41-first notch; 5-lower connecting sheet; 6-first insulating ring; 7-second insulating ring; 8-welding clearance notch; 81-first clearance notch; 82-second clearance notch; 83-third clearance notch; 9-foolproof notch; 91-third notch; 92-fourth notch; 93-fifth notch; 101-first welding part; 102-second welding part; 103-third welding part; 104-fourth welding part; 105-fifth welding part; 106-sixth welding part; 107-seventh welding part; 108-welding point; 11-adhesive film; 111-first film; 112-second film; 113-third film; 114-fourth film; 12-aluminum connecting piece; 21-shell; 22-battery cell. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 3 As shown, in one embodiment, the present invention provides a battery cover structure, including a metal substrate 1, a cap 2, a thermistor sheet 3 and an upper connecting sheet 4; The metal substrate 1 is used to connect to the battery housing 21 and to electrically connect to the negative electrode of the battery cell 22. The lower side of the metal substrate 1 is used to face the inside of the battery. The metal substrate 1 is provided with a first mounting hole 11. The cap 2 is used to connect the positive electrode of the battery cell 22. The cap 2 is arranged in the first mounting hole 11. The cap 2 is insulated and sealed and connected to the metal substrate 1. The thermistor sheet 3 is arranged on the upper side of the metal substrate 1 , and the upper connecting sheet 4 is arranged on the upper side of the thermistor sheet 3 ; the upper connecting sheet 4 and the metal substrate 1 are connected or disconnected through the thermistor sheet 3 .

[0032] Specifically, the cap 2 includes a cap body 21 and a brim 22 , the brim 22 is an annular sheet structure, the cap body 21 is a columnar structure, the inner periphery of the brim 22 is connected to the outer periphery of one end of the cap body 21 , and the outer periphery of the brim 22 extends in a direction away from the axis of the cap body 21 .

[0033] Furthermore, the cap 2 is placed in the first mounting hole 11, and the outer periphery of the eaves 22 and the inner wall of the first mounting hole 11 are spaced apart by a first gap; the cap 2 is connected to the metal substrate 1 through an insulating seal of the adhesive film 11; the adhesive film 11 includes a first film 111, a second film 112 and a third film 113, the first film 111 is in a hollow cylindrical shape, the first film 111 is filled in the first gap, the inner periphery of the first film 111 is bonded to the outer periphery of the eaves 22, and the outer periphery of the first film 111 is bonded to the inner wall of the first mounting hole 11 ; The second film 112 is an annular sheet structure, the inner periphery of the second film 112 is connected to the outer periphery of the first end of the first film 111, the outer periphery of the second film 112 extends to the upper surface of the metal substrate 1 along the direction away from the axis of the cap body 21, and is bonded to the upper surface of the metal substrate 1; the third film 113 is an annular sheet structure, the outer periphery of the third film 113 is connected to the inner periphery of the first end of the first film 111, the inner periphery of the third film 113 extends to the upper surface of the eaves body 22 along the direction close to the axis of the cap body 21, and is bonded to the upper surface of the eaves body 22.

[0034] Furthermore, it also includes an aluminum connecting sheet 12, the metal substrate 1 and the cap 2 are arranged on the upper surface of the aluminum connecting sheet 12, the metal substrate 1 and the aluminum connecting sheet 12 are spaced apart by a second gap, and the adhesive film 11 also includes a fourth film 114, the fourth film 114 is an annular sheet structure, the inner periphery of the fourth film 114 is connected to the outer periphery of the second end of the first film 111, and the fourth film 114 is filled in the second gap.

[0035] By arranging the thermistor sheet 3 on the upper side of the metal substrate 1, when a short circuit occurs in the battery, the internal temperature of the battery rises, and the resistance of the thermistor sheet 3 increases, thereby disconnecting the battery circuit and protecting the battery from the impact of abnormally large currents; at the same time, by arranging the upper connecting sheet 4 above the thermistor sheet 3, the thermistor sheet 3 can provide a quick feedback effect, and can timely protect the battery from the impact of abnormally large currents; at the same time, using the upper connecting sheet 4 as an output component can effectively avoid the formation of an oxide film on the exposed surface of the upper connecting sheet 4, which causes the contact impedance between it and the electrical connector outside the battery to increase.

[0036] like Figure 1-Figure 3 As shown, in one embodiment, a lower connecting piece 5 is further included; the lower connecting piece 5 is disposed on the upper side of the metal substrate 1 and is electrically connected to the metal substrate 1; The thermistor sheet 3 is arranged on the upper side of the lower connecting sheet 5; the upper connecting sheet 4 and the lower connecting sheet 5 are connected or disconnected through the thermistor sheet 3.

[0037] Specifically, the lower connecting piece 5 is arranged between the thermistor sheet 3 and the metal substrate 1, the lower surface of the lower connecting piece 5 is bonded to the upper surface of the metal substrate 1, the lower connecting piece 5 is welded to the metal substrate 1, the upper surface of the lower connecting piece 5 is bonded to the lower surface of the thermistor sheet 3, and the lower connecting piece 5 is welded to the thermistor sheet 3.

[0038] like Figure 1-Figure 3 As shown, in one embodiment, the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 are annular pieces; the annular pieces (i.e., the upper connecting piece 4, thermistor piece 3 and the lower connecting piece 5) are sleeved on the cap 2 and spaced apart from the cap 2 to prevent the upper connecting piece 4, thermistor piece 3 and the lower connecting piece 5 from contacting the cap 2 and causing a short circuit in the battery.

[0039] Specifically, the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 are all annular pieces, and the inner ring diameters of the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 are the same and larger than the outer diameter of the cap body 21; the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 are stacked and sleeved on the cap 2, and the inner rings of the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 do not contact the outer surface of the cap body 21, thereby avoiding the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 from contacting the cap 2 and causing a battery short circuit.

[0040] like Figure 1-Figure 3 As shown, in one embodiment, it also includes a first insulating ring 6, the first insulating ring 6 is sleeved on the cap 2, the lower connecting piece 5, the thermistor piece 3 and the upper connecting piece 4 are sequentially sleeved on the first insulating ring 6, the lower connecting piece 5, the thermistor piece 3 and the upper connecting piece 4 are stacked in sequence, so that the lower connecting piece 5, the thermistor piece 3 and the upper connecting piece 4 are separated from the cap 2 by the first insulating ring 6, thereby preventing the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 from contacting the cap 2 and causing a battery short circuit.

[0041] In one embodiment, the first insulating ring 6 is bonded to the adhesive film 11, and the first insulating ring 6 is reliably connected to the metal substrate 1 through the adhesive film 11 to improve the structural stability; specifically, after the cap 2 is insulated and sealed to the metal substrate 1 through the adhesive film 11, the first insulating ring 6 is bonded to the adhesive film 11 to facilitate assembly. Preferably, the lower surface of the first insulating ring 6 is bonded to the upper surface of the second film 112 and the third film 113, so that they are bonded into a whole, which improves the overall strength of the cover plate structure and reduces the probability of deformation of the cover plate structure; In one embodiment, the distance between the inner surface of the first insulating ring 6 and the outer surface of the cap 2 is 0.05-0.1 mm, thereby reducing the difficulty of assembling the first insulating ring 6 and the cap 2 .

[0042] like Figure 1 , Figure 8As shown, in one embodiment, the upper end of the first insulating ring 6 protrudes from the upper end of the cap 2; the height of a section of the upper end of the first insulating ring 6 protruding from the upper end of the cap 2 is amm, and the value of a is: 0.2≤a≤0.5.

[0043] Specifically, the value of a is any point value among 0.2, 0.3, 0.4 or 0.5, or a range of any two point values; in one embodiment, the value of a is 0.3-0.4.

[0044] When the value of a is: 0.2≤a≤0.5, it has the technical effect of preventing the cap 2 from contacting the negative electrode and causing an external short circuit; when the value of a is less than 0.2, it prevents the external positive circuit connected to the cap 2 (such as the positive electrode on the battery PACK) from contacting the external negative circuit connected to the upper connecting piece 4 (such as the negative electrode on the battery PACK) to cause an external short circuit; when the value of a is greater than 0.5, it will cause the battery cover to be too thick in the direction of the battery thickness, affecting the battery volume and causing the problem of low battery capacity density.

[0045] like Figure 1-Figure 3 As shown, in one embodiment, it further includes a second insulating ring 7 , which is arranged outside the first insulating ring 6 and covers the upper side of the upper connecting piece 4 .

[0046] Specifically, the second insulating ring 7 is covered on the upper side of the upper connecting plate 4 to protect the upper connecting plate 4 and prevent metal debris or liquid from entering the battery through the process notch on the surface of the upper connecting plate 4 to cause a micro short circuit, thereby achieving better battery insulation and sealing effects.

[0047] Preferably, the inner circle of the upper connecting piece 4 is exposed outside the second insulating ring 7, so as to facilitate the connection between the upper connecting piece 4 and the external negative circuit. More preferably, the upper sections of the first insulating ring 6 and the second insulating ring 7 both protrude from the upper surface of the upper connecting piece 4, and the inner circle of the upper connecting piece 4 is exposed outside the second insulating ring 7; it can prevent the external positive circuit connected to the cap 2 (such as the positive electrode on the battery PACK) from contacting the external negative circuit connected to the upper connecting piece 4 (such as the negative electrode on the battery PACK), causing an external short circuit, and the process notch (such as the welding clearance notch and the foolproof notch described later) can be set on the outer circle of the upper connecting piece 4, and the second insulating ring 7 is covered on the upper side of the upper connecting piece 4 to protect the upper connecting piece 4, prevent metal debris or liquid from entering the battery through the process notch on the surface of the upper connecting piece 4, causing a micro short circuit, and achieve better battery insulation and sealing effects.

[0048] like Figure 1-Figure 3As shown, in one embodiment, the inner periphery of the second insulating ring 7 is spaced from the outer periphery of the first insulating ring 6; the outer periphery of the second insulating ring 7, the outer periphery of the upper connecting piece 4, the outer periphery of the thermistor sheet 3 and the outer periphery of the lower connecting piece 5 are located on the same annular surface, that is, the outer periphery of the second insulating ring 7, the outer periphery of the upper connecting piece 4, the outer periphery of the thermistor sheet 3 and the outer periphery of the lower connecting piece 5 are aligned in the up and down directions, reducing the battery space occupied by the second insulating ring 7, the upper connecting piece 4, the thermistor sheet 3 and the lower connecting piece 5, increasing the overall structural strength of the second insulating ring 7, the upper connecting piece 4, the thermistor sheet 3, the lower connecting piece 5 and the metal substrate 1, and the second insulating ring 7 is completely covered on the upper side of the outer ring of the upper connecting piece 4 to protect the upper connecting piece 4, prevent metal debris or liquid from entering the battery through the process notch on the surface of the upper connecting piece 4, causing a micro short circuit, and play an insulating and sealing effect.

[0049] More preferably, the outer periphery of the second insulating ring 7, the outer periphery of the upper connecting piece 4, the outer periphery of the thermistor sheet 3, the outer periphery of the lower connecting piece 5 and the outer periphery of the metal substrate 1 are located on the same annular surface, that is, the outer periphery of the second insulating ring 7, the outer periphery of the upper connecting piece 4, the outer periphery of the thermistor sheet 3 and the outer periphery of the lower connecting piece 5 are aligned in the up and down direction, which is beneficial to increase the overall strength of the cover plate structure.

[0050] like Figure 1 , Figure 8 As shown, in one embodiment, the thickness of the second insulating ring 7 is b mm, and the value of b is: 0.2≤b≤0.7.

[0051] Specifically, the value of b is any point value among 0.2, 0.3, 0.4, 0.5, 0.6 or 0.7, or a range of any two point values; in one embodiment, the value of b is 0.4-0.6.

[0052] When the value of b is 0.2≤b≤0.7, it has the technical effect of avoiding external short circuit; when the value of b is less than 0.2, the cover is prone to external short circuit; when the value of b is greater than 0.7, the battery cover will be too thick in the direction of the battery thickness, affecting the battery volume and causing the problem of low battery capacity density.

[0053] like Figure 3 , Figure 6 As shown, in one embodiment, a plurality of first notches 41 are provided on the outer periphery of the upper connecting sheet 4, and second notches 31 are provided at positions corresponding to the first notches 41 on the thermistor sheet 3; the first notches 41 and the corresponding second notches 31 are combined to form a welding clearance notch 8; The lower connecting piece 5 is connected to the metal substrate 1 via a plurality of first welding portions 101 ; the first welding portions 101 are arranged corresponding to the welding clearance notches 8 ; and the upper sides of the first welding portions 101 are arranged opposite to the corresponding welding clearance notches 8 .

[0054] By setting a plurality of first notches 41 on the outer periphery of the upper connecting sheet 4 and a plurality of second notches 31 on the thermistor sheet 3, the upper and lower corresponding first notches 41 and second notches 31 form a welding clearance notch 8, and by welding the lower connecting sheet 5 to the metal substrate 1 at the welding clearance notch 8, a first welding portion 101 is formed, thereby connecting the lower connecting sheet 5 to the metal substrate 1.

[0055] In this application, Figure 3-Figure 5 The dots of the middle welding parts (the first welding part 101, the second welding part 102, the third welding part 103, the fourth welding part 104, the fifth welding part 105, the sixth welding part 106, and the seventh welding part 107) are the welding points 108 included in the corresponding welding parts, and the number of dots is the number of welding points 108; for example, combined with Figure 5 and Figure 6 , the second welding portion 102 has four welding points 108 .

[0056] like Figure 6-Figure 7 As shown, in one embodiment, the first welding portion 101 and the welding clearance notch 8 are arranged in a one-to-one correspondence; the first welding portion 101 includes at least one welding point.

[0057] Specifically, the first welding parts 101 are arranged in one-to-one correspondence with the welding clearance notches 8, and the lower connecting piece 5 is welded to the metal substrate 1 at each welding clearance notch 8 to form a plurality of first welding parts 101, and each first welding part 101 includes at least one welding point, so that the lower connecting piece 5 is connected to the metal substrate 1 at the corresponding welding clearance notch 8.

[0058] like Figure 6-Figure 7 As shown, in one embodiment, the welding clearance notch 8 is C-shaped; the first welding portion 101 includes two welding spots distributed along the circumference of the lower connecting plate 5, or the first welding portion 101 includes three welding spots distributed in a triangular shape; In a preferred embodiment, two welding spots are arranged in the C-shaped welding clearance notch 8, the two welding spots are distributed along the circumference of the lower connecting piece 5, and the distance between the two welding spots in each welding clearance notch 8 is equal, thereby improving the welding stability of the lower connecting piece 5 and the metal substrate 1; Alternatively, three welding spots are arranged in the C-shaped welding clearance notch 8 , the three welding spots are distributed in a triangle, and the distance between two adjacent welding spots is equal, thereby improving the welding stability between the lower connecting piece 5 and the metal substrate 1 .

[0059] like Figure 6-Figure 7As shown, in another embodiment, the welding clearance notch 8 is U-shaped (not shown); the first welding portion 101 includes two welding points distributed along the circumference of the lower connecting plate 5, or the first welding portion 101 includes three welding points distributed in a triangular shape, or the first welding portion 101 includes four welding points distributed in an array.

[0060] Specifically, two welding spots are arranged in the U-shaped welding clearance notch 8, and the two welding spots are distributed along the circumference of the lower connecting piece 5, and the distance between the two welding spots in each welding clearance notch 8 is equal, thereby improving the welding stability of the lower connecting piece 5 and the metal substrate 1; Alternatively, three welding spots are arranged in the U-shaped welding clearance notch 8, the three welding spots are distributed in a triangle, and the distance between two adjacent welding spots is equal, thereby improving the welding stability between the lower connecting piece 5 and the metal substrate 1; Alternatively, four welding spots are arranged in the U-shaped welding clearance notch 8 , the four welding spots are distributed in an array, and the distance between two adjacent welding spots is equal, thereby improving the welding stability between the lower connecting piece 5 and the metal substrate 1 .

[0061] like Figure 4-Figure 6 As shown, in one embodiment, a third notch 93 is provided on the outer periphery of the upper connecting sheet 4, a fourth notch 92 is provided on the thermistor sheet 3 at a position corresponding to the third notch 93, and a fifth notch 93 is provided on the lower connecting sheet 5 at a position corresponding to the fourth notch 92; The third notch 93 , the fourth notch 92 and the fifth notch 93 are combined to form the fool-proof notch 9 .

[0062] Specifically, the third notch 93, the fourth notch 92 and the fifth notch 93 are combined to form an anti-mock notch 9, which facilitates the assembly of the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5. By making the projections of the third notch 93, the fourth notch 92 and the fifth notch 93 in the thickness direction of the battery cover plate structure overlap, the upper connecting piece 4, the thermistor piece 3 and the lower connecting piece 5 can be quickly positioned and assembled, thereby improving the assembly efficiency.

[0063] like Figure 7 As shown, in one embodiment, the thermistor sheet 3 is a PPTC sheet, and the upper connecting sheet 4, the thermistor sheet 3 and the lower connecting sheet 5 are connected by a welding portion 10. The PPTC sheet refers to the thermistor sheet 3 made of a polymer material. Compared with PTC (i.e., thermistor sheet made of ceramic material), the PPTC sheet can be connected to the upper connecting sheet 4 and the lower connecting sheet 5 by a laser welding process, so that the upper connecting sheet 4, the thermistor sheet 3 and the lower connecting sheet 5 can all be stably connected to the metal substrate 1.

[0064] Specifically, the upper connecting sheet 4, the thermistor sheet 3 and the lower connecting sheet 5 have a plurality of welding areas, the upper connecting sheet 4 and the thermistor sheet 3 are welded at the plurality of welding areas to form welding portions, and the lower connecting sheet 5 and the thermistor sheet 3 are welded at the plurality of welding areas to form welding portions, thereby connecting the upper connecting sheet 4, the thermistor sheet 3 and the lower connecting sheet 5 into an integrated structure.

[0065] like Figure 6-Figure 7 As shown, in one embodiment, the plurality of welding clearance notches 8 are respectively a first clearance notch 81, a second clearance notch 82 and a third clearance notch 83; The foolproof notch 9 is provided between the first clearance notch 81 and the third clearance notch 83; A plurality of welding parts 10, comprising: A second welding portion 102 located between a first side of the foolproof notch 9 and one side of the first clearance notch 81, a third welding portion 103 located between the other side of the first clearance notch 81 and one side of the second clearance notch 82, and a fourth welding portion 104 located between the other side of the second clearance notch 82 and the third clearance notch 83; The thermistor sheet 3 and the upper connection sheet 4 are connected via the second welding portion 102 , the third welding portion 103 and the fourth welding portion 104 .

[0066] Specifically, a first welding portion 101 is provided at positions corresponding to the first clearance gap 81, the second clearance gap 82 and the third clearance gap 83, and the lower connecting piece 5 is welded to the metal substrate 1 at the first clearance gap 81, the second clearance gap 82 and the third clearance gap 83, so that the lower connecting piece 5 is connected to the metal substrate 1 at the corresponding welding clearance gaps 8.

[0067] The upper connecting sheet 4 and the thermistor sheet 3 are welded and connected at the second welding portion 102 , the third welding portion 103 and the fourth welding portion 104 , so as to fix the upper connecting sheet 4 and the thermistor sheet 3 and enhance the connection firmness between the upper connecting sheet 4 and the thermistor sheet 3 .

[0068] like Figure 6-Figure 7 As shown, in one embodiment, a plurality of welding parts include: The fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107, the thermistor sheet 3 and the lower connecting sheet 5 are connected through the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107, so that the thermistor sheet 3 and the lower connecting sheet 5 are fixedly connected, and the connection firmness between the thermistor sheet 3 and the lower connecting sheet 5 is enhanced.

[0069] like Figure 7As shown, in one embodiment, the fifth welding portion 105 is located between the third clearance gap and the first clearance gap, the sixth welding portion 106 is located between the first clearance gap and the second clearance gap, the seventh welding portion 107 is located between the second clearance gap and the third clearance gap, the fifth welding portion 105 is staggered from the second welding portion 102, the sixth welding portion 106 is staggered from the third welding portion 103, and the seventh welding portion 107 is staggered from the fourth welding portion 104; the upper connecting sheet 4 can be welded to the thermistor sheet 3, and the thermistor sheet 3 can be welded to the lower connecting sheet 5 is welded, the lower connecting sheet 5 is welded to the metal substrate 1, that is, the upper connecting sheet 4, the thermistor sheet 3, the lower connecting sheet 5 and the metal substrate 1 are welded between two adjacent layers of the structure, so that the upper connecting sheet 4, the thermistor sheet 3, the lower connecting sheet 5 and the metal substrate 1 are welded into an integrated structure, avoiding the one-time welding of the three-layer structure or the four-layer structure of the upper connecting sheet 4, the thermistor sheet 3, the lower connecting sheet 5 and the metal substrate 1 through the welding process, increasing the welding reliability, and ensuring the connection reliability of the upper connecting sheet 4, the thermistor sheet 3, the lower connecting sheet 5 and the metal substrate 1.

[0070] like Figure 6-Figure 7 As shown, in one embodiment, the second welding portion 102 is provided as one, and is disposed adjacent to the first clearance notch 81; There are two third welding parts 103, which are respectively disposed adjacent to the first clearance notch 81 and the second clearance notch 82; The fourth welding portion 104 is provided as one, and is provided adjacent to a side of the third clearance notch 83 which is away from the fool-proof notch 9; The second welding portion 102 , the third welding portion 103 , and the fourth welding portion 104 each include at least one welding point.

[0071] Specifically, the second welding portion 102 is used to fix the position between the anti-mistake notch 9 and the first clearance notch 81; the third welding portions 103 are set as two, both of which are arranged between the first clearance notch 81 and the second clearance notch 82, one of the third welding portions 103 is arranged close to the first clearance notch 81, and the other third welding portion 103 is arranged close to the second clearance notch 82, and the two third welding portions 103 are used to fix the position between the first clearance notch 81 and the second clearance notch 82; the fourth welding portion 104 is arranged between the second clearance notch 82 and the third clearance notch 83, and is arranged close to the third clearance notch 83, and the fourth welding portion 104 is used to fix the position between the second clearance notch 82 and the third clearance notch 83.

[0072] The second welding portion 102 , the third welding portion 103 and the fourth welding portion 104 each include at least one welding point, so as to connect the upper connecting sheet 4 and the thermistor sheet 3 at the corresponding welding portion 10 .

[0073] like Figure 6-Figure 7As shown, in one embodiment, the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107 are configured as one; the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107 each include at least one welding point.

[0074] Specifically, the first clearance notch 81, the second clearance notch 82 and the third clearance notch 83 are evenly distributed in the circumferential direction of the cover plate structure, the second welding portion 102, the two third welding portions 103 and the fourth welding portion 104 are evenly distributed in the circumferential direction of the cover plate structure, and the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107 are evenly distributed in the circumferential direction of the thermistor sheet 3; the connection reliability of the upper connecting sheet 4, the thermistor sheet 3, the lower connecting sheet 5 and the metal substrate 1 is increased.

[0075] Preferably, the fifth welding portion 105 is located within the side of the fool-proof notch away from the periphery of the thermistor sheet 3, that is, the fifth welding portion 105 is located on the side of the fool-proof notch facing the axis of the thermistor sheet 3, the sixth welding portion 106 and the seventh welding portion 107 are located in the middle of the thermistor sheet 3 in a direction perpendicular to its axis, and the distance between the sixth welding portion 106 and the fifth welding portion 105 is equal to the distance between the seventh welding portion 107 and the fifth welding portion 105.

[0076] like Figure 6-Figure 7 As shown, in one embodiment, at least one of the second welding portion 102, the third welding portion 103, and the fourth welding portion 104 includes 2-4 welding points.

[0077] Specifically, the number of the welding points 108 of the second welding portion 102 is any one of 2, 3 or 4; in a preferred embodiment, the second welding portion 102 includes 3-4 welding points 108; Specifically, the number of welding points of the third welding portion 103 is any one of 2, 3 or 4; in a preferred embodiment, the third welding portion 103 includes 3-4 welding points; Specifically, the number of welding points of the fourth welding portion 104 is any one of 2, 3 or 4; in a preferred embodiment, the fourth welding portion 104 includes 3-4 welding points; Two to four welding points are respectively arranged on the second welding portion 102 , the third welding portion 103 and the fourth welding portion 104 , so as to connect the upper connecting sheet 4 and the thermistor sheet 3 at the corresponding welding portions 10 .

[0078] like Figure 6-Figure 7 As shown, in one embodiment, at least one of the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107 includes 2-4 welding points.

[0079] Specifically, the number of welding points of the fifth welding portion 105 is any one of 2, 3 or 4; in a preferred embodiment, the fifth welding portion 105 includes 3-4 welding points; Specifically, the number of welding points of the sixth welding portion 106 is any one of 2, 3 or 4; in a preferred embodiment, the sixth welding portion 106 includes 3-4 welding points; Specifically, the number of welding points of the seventh welding portion 107 is any one of 2, 3 or 4; in a preferred embodiment, the seventh welding portion 107 includes 3-4 welding points; Two to four welding spots are respectively arranged on the fifth welding portion 105 , the sixth welding portion 106 and the seventh welding portion 107 , so as to connect the thermistor sheet 3 and the lower connecting sheet 5 at the corresponding welding portions 10 .

[0080] like Figure 6-Figure 7 As shown, in one embodiment, at least one of the second welding portion 102, the third welding portion 103, the fourth welding portion 104, the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107 includes three welding points distributed in a triangle, or four welding points distributed in an array.

[0081] Three welding points can be selectively arranged at the second welding portion 102, the third welding portion 103 and the fourth welding portion 104. The three welding points are distributed in a triangle, and the distance between two adjacent welding points is equal, thereby improving the welding stability of the upper connecting sheet 4 and the thermistor sheet 3; Alternatively, four welding spots may be selectively arranged at the second welding portion 102 , the third welding portion 103 and the fourth welding portion 104 . The four welding spots are distributed in an array, and the distance between two adjacent welding spots is equal, thereby improving the welding stability between the upper connecting sheet 4 and the thermistor sheet 3 .

[0082] Three welding points can be selectively arranged at the fifth welding portion 105, the sixth welding portion 106 and the seventh welding portion 107. The three welding points are distributed in a triangle shape, and the distance between two adjacent welding points is equal, thereby improving the welding stability of the thermistor sheet 3 and the lower connecting sheet 5; Alternatively, four welding spots may be selectively arranged at the fifth welding portion 105 , the sixth welding portion 106 and the seventh welding portion 107 . The four welding spots are distributed in an array, and the distance between two adjacent welding spots is equal, thereby improving the welding stability between the thermistor sheet 3 and the lower connecting sheet 5 .

[0083] like Fig. 9 As shown, in one embodiment, the distance between the second welding portion 102 and the first clearance notch 81 is cmm, and the value range of c is 0.7-1.5; The third welding portion 103 adjacent to the first clearance notch 81 is at a distance of dmm from the first clearance notch 81, where the value of d is in the range of 1.0-2.0; The third welding portion 103 adjacent to the second clearance notch 82 is at a distance of emm from the second clearance notch 82, where the value of e is in the range of 0.5-1.5; The distance between the fourth welding portion 104 and the third clearance notch 83 is f mm, and the value range of f is 0.5-1.5.

[0084] Specifically, the value of c is any point value among 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4 or 1.5, or a range of any two point values; in a preferred embodiment, the value of c is 0.8-1.2.

[0085] When the value of c is: 0.7≤c≤1.5, the edge of the weld point 108 has an optimal distance from the edge of the upper connecting piece 4, and the weld point 108 can be distributed within the center range of the upper connecting piece 4; when the value of c is less than 0.7, it will lead to insufficient margins and insufficient position tolerance of the offset of the weld point 108, which may easily lead to cold welding or false welding; when the value of c is greater than 1.5, the weld point 108 will not be centered, affecting the strength of the laser welding.

[0086] Specifically, the value of d is any point value among 1.0, 1.2, 1.4, 1.6, 1.8 or 2.0, or a range of any two point values; in a preferred embodiment, the value of d is 1.4-1.6.

[0087] When the value of d is: 1.0≤d≤2.0, the position of the laser welding point 108 is optimal; when the value of d is less than 1.0, insufficient margin will lead to poor welding or false welding; when the value of d is greater than 2.0, it will cause welding position deviation, affecting the overall welding strength.

[0088] Specifically, the value of e is any point value among 0.5, 0.7, 0.9, 1.1, 1.3 or 1.5, or a range of any two point values; in a preferred embodiment, the value of e is 0.7-1.1.

[0089] When the value of e is: 0.5≤e≤1.5, it has a suitable margin and position tolerance margin, and the feasibility of mass production is high; when the value of e is less than 0.5, the distance will be too small, and the solder joint 108 has a high probability of cold soldering; when the value of e is greater than 1.5, the distance between the two third soldering parts 103 will be close, and the solder joint 108 is not in the best position. Specifically, the value of f is any point value among 0.5, 0.7, 0.9, 1.1, 1.3, and 1.5, or a range value composed of any two point values; in a preferred embodiment, the value of e is 0.7-1.1.

[0090] When the value of f is: 0.5≤f≤1.5, the weld 108 has a stress release area, and the weld 108 has a reasonable safety distance from the upper connecting plate 4; when the value of f is less than 0.5, the distance between the fourth welding part 104 and the third clearance gap 83 will be too small, and there will be no reasonable manufacturing tolerance margin; when the value of f is greater than 1.5, the weld 108 will deviate from the optimal position (the center position of α3 and α4).

[0091] like Figure 1-Figure 2 As shown, in one embodiment, the angle between two adjacent welding portions 10 is α, and the range of α is 40°≤α≤110°.

[0092] In one embodiment, the angle between the third welding portion 103 adjacent to the second welding portion 102 and the second welding portion 102 is α1, and the range of α1 is 40°≤α1≤50°; Specifically, the range of α1 is any point value among 40°, 42°, 44°, 46°, 48° or 50°, or a range value consisting of any two point values; in a preferred embodiment, the range of α1 is 44°-46°.

[0093] When the range of α1 is: 40°≤α1≤50°, it has the technical effect of achieving the best welding position between the second welding part 102 and the third welding part 103, and having both a stress release area and being close to the center position; when the range of α1 is less than 40°, it will cause the angle between the second welding part 102 and the third welding part 103 to be too small, and the distance between the welding point and the component margin to be too small, which may easily cause the problem of insufficient welding strength; when the range of α1 is greater than 50°, it will cause the welding point 108 to be distributed in a non-optimal area, thereby reducing the mechanical strength of the welding.

[0094] In one embodiment, the angle between two adjacent third welding portions 103 is α2, and the range of α2 is 60°≤α2≤70°; Specifically, the range of α2 is any point value among 60°, 62°, 64°, 66°, 68°, and 70°, or a range value consisting of any two point values; in a preferred embodiment, the range of α2 is 64°-66°.

[0095] When the range of α2 is: 60°≤α2≤70°, the weld point 108 is in the optimal position, and there is an appropriate amount of stress release area between the third weld part 103 and the first clearance notch 81 and the second clearance notch 82; when the range of α2 is less than 60°, the distance between the third weld part 103 and the first clearance notch 81 and the second clearance notch 82 will be too large, affecting the welding performance; when the range of α2 is greater than 70°, the weld point 108 of the third weld part 103 will not have enough stress release area.

[0096] In one embodiment, the included angle between the third welding portion 103 adjacent to the fourth welding portion 104 and the fourth welding portion 104 is α3, and the range of α3 is 100°≤α3≤110°; Specifically, the range of α3 is any point value among 100°, 102°, 104°, 106°, 108° or 110°, or a range value consisting of any two point values; in a preferred embodiment, the range of α3 is 104°-106°.

[0097] When the range of α3 is: 100°≤α3≤110°, the position of the third welding portion 103 and the welding point 108 of the second clearance notch 102 have a suitable position; when the range of α3 is less than 100°, the welding point 108 and the third clearance notch 103 will be far away, affecting the welding strength of the upper connecting plate 4 and the thermistor plate 3; when the range of α3 is greater than 110°, the fourth welding portion 104 and the third clearance notch 83 will be too small, and there will be a lack of manufacturing tolerance margin.

[0098] In one embodiment, the included angle between the fourth welding portion 104 and the second welding portion 102 is α4, and the range of α4 is 80°≤α4≤90°; Specifically, the range of α4 is any point value among 80°, 82°, 84°, 86°, 88° or 90°, or a range consisting of any two point values; in a preferred embodiment, the range of α4 is 84°-86°.

[0099] When the range of α4 is: 80°≤α4≤90°, the laser weld point 108 of the second welding part 102 and the weld point 108 of the first clearance notch 81 have a technical effect of suitable spacing and sufficient manufacturing tolerance; when the range of α4 is less than 80°, the weld point 108 of the second welding part 102 will deviate from the center position between the first clearance notch 81 and the anti-fool notch 9, affecting its welding performance; when the range of α4 is greater than 90°, the spacing between the fourth welding part 104 and the third clearance notch 83 will be too large, and the stress release area will be too small.

[0100] like Figure 1-Figure 2 As shown, in one embodiment, the material of the upper connecting plate 4 and the lower connecting plate 5 is respectively one of nickel and a nickel alloy.

[0101] Specifically, the upper connecting sheet 4 and the lower connecting sheet 5 simultaneously use one of nickel and nickel alloy as output surfaces, which can effectively avoid the formation of an oxide film on the surface of the thermistor sheet 3 that causes the contact impedance to increase.

[0102] The upper connecting sheet 4 and the lower connecting sheet 5 are used to compositely cover the thermistor sheet 3 to ensure that the thermistor sheet 3 effectively prevents thermal runaway. At the same time, the upper connecting sheet 4 and the lower connecting sheet 5 are made of one of nickel and nickel alloys to ensure the long-term use requirements of the output surface.

[0103] In one embodiment, the present invention provides a button battery, including a shell 21, a battery cell 22 and a battery cover structure as described in any of the above embodiments, wherein the battery cell 22 is disposed in the shell 21, and the battery cover structure is sealed to cover the shell 21.

[0104] The battery of the present invention is a button battery. The battery housing 21 of the present invention is a hollow structure with one end open. The battery cell 22 is placed in the battery housing 21, and electrolyte is injected into the battery housing 21. The cover structure is connected to the open end of the battery housing 21 to complete the battery cell 22 process.

[0105] Specifically, a positive electrode ear is provided at one end of the battery cell 22 close to the cover structure, and a negative electrode ear is provided at one end of the battery cell 22 away from the cover structure. The positive electrode ear of the battery cell 22 is welded to the aluminum connecting sheet 12, the negative electrode ear of the battery cell 22 is connected to the bottom of the battery shell 21, and the open end of the battery shell 21 is welded to the outer periphery of the metal cover 1.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover structure, characterized in that: It includes a metal substrate, a cap, a thermistor sheet and an upper connecting sheet; The metal substrate is used to connect to the battery shell and to electrically connect to the negative electrode of the battery cell. The lower side of the metal substrate is used to face the inside of the battery. A first mounting hole is provided on the metal substrate. The cap is used to connect the positive electrode of the battery cell, the cap is arranged in the first mounting hole, and the cap is insulated and sealed and connected to the metal substrate; The thermistor sheet is arranged on the upper side of the metal substrate, and the upper connecting sheet is arranged on the upper side of the thermistor sheet; the upper connecting sheet and the metal substrate are connected or disconnected through the thermistor sheet.

2. The battery cover structure according to claim 1, characterized in that: It also includes a lower connecting piece; the lower connecting piece is arranged on the upper side of the metal substrate and is electrically connected to the metal substrate; The thermistor sheet is arranged on the upper side of the lower connecting sheet; the upper connecting sheet and the lower connecting sheet are connected or disconnected through the thermistor sheet.

3. The battery cover structure according to claim 2, characterized in that: The upper connecting piece, the thermistor piece and the lower connecting piece are annular pieces; the annular piece is sleeved on the cover cap and is spaced apart from the cover cap.

4. The battery cover structure according to claim 3, characterized in that: It also includes a first insulating ring, which is sleeved on the cap, and the lower connecting piece, the thermistor piece and the upper connecting piece are sleeved on the first insulating ring in sequence.

5. The battery cover structure according to claim 4, characterized in that: The upper end of the first insulating ring protrudes from the upper end of the cap; the height of a section of the upper end of the first insulating ring protruding from the upper end of the cap is amm, and the value of a is: 0.2≤a≤0.

5.

6. The battery cover structure according to claim 4, characterized in that: It also includes a second insulating ring, which is arranged outside the first insulating ring and the second insulating ring cover is arranged on the upper side of the upper connecting piece.

7. The battery cover structure according to claim 6, characterized in that: The inner periphery of the second insulating ring is spaced apart from the outer periphery of the first insulating ring; the outer periphery of the second insulating ring, the outer periphery of the upper connecting piece, the outer periphery of the thermistor sheet and the outer periphery of the lower connecting piece are located on the same annular surface.

8. The battery cover structure according to claim 6, characterized in that: The thickness of the second insulating ring is b mm, and the value of b is: 0.2≤b≤0.

7.

9. The battery cover structure according to any one of claims 2 to 8, characterized in that: A plurality of first notches are arranged on the outer circumference of the upper connecting sheet, and second notches are arranged at positions corresponding to the first notches on the thermistor sheet; the first notches and the corresponding second notches are combined to form a welding clearance notch; The lower connecting piece is connected to the metal substrate via a plurality of first welding portions; the first welding portions are arranged corresponding to the welding clearance notches; and the upper sides of the first welding portions are arranged opposite to the corresponding welding clearance notches.

10. The battery cover structure according to claim 9, characterized in that: The first welding portion and the welding clearance notch are arranged in one-to-one correspondence; the first welding portion includes at least one welding point.

11. The battery cover structure according to claim 10, characterized in that: The welding clearance notch is C-shaped; the first welding portion includes two welding spots distributed along the circumference of the lower connecting plate, or the first welding portion includes three welding spots distributed in a triangle; or, The welding clearance notch is U-shaped; the first welding portion includes two welding spots distributed along the circumference of the lower connecting plate, or the first welding portion includes three welding spots distributed in a triangle, or the first welding portion includes four welding spots distributed in an array.

12. The battery cover structure according to claim 9, characterized in that: A third notch is provided on the outer periphery of the upper connecting sheet, a fourth notch is provided on the thermistor sheet at a position corresponding to the third notch, and a fifth notch is provided on the lower connecting sheet at a position corresponding to the fourth notch; The third notch, the fourth notch and the fifth notch are combined to form a fool-proof notch.

13. The battery cover structure according to claim 12, characterized in that: The thermistor sheet is a PPTC sheet, and the upper connecting sheet, the thermistor sheet and the lower connecting sheet are connected via a welding portion.

14. The battery cover structure according to claim 13, characterized in that: The plurality of welding clearance gaps are respectively a first clearance gap, a second clearance gap and a third clearance gap; The foolproof notch is arranged between the first clearance notch and the third clearance notch; The plurality of welding parts include: A second welding portion located between a first side of the foolproof notch and one side of the first clearance notch, a third welding portion located between the other side of the first clearance notch and one side of the second clearance notch, and a fourth welding portion located between the other side of the second clearance notch and the third clearance notch; The thermistor sheet and the upper connecting sheet are connected through the second welding portion, the third welding portion and the fourth welding portion.

15. The battery cover structure according to claim 14, characterized in that: The plurality of welding parts further include a fifth welding part, a sixth welding part and a seventh welding part; the thermistor sheet and the lower connecting sheet are connected through the fifth welding part, the sixth welding part and the seventh welding part; The fifth welding portion is located between the third clearance gap and the first clearance gap, the sixth welding portion is located between the first clearance gap and the second clearance gap, the seventh welding portion is located between the second clearance gap and the third clearance gap, the fifth welding portion is staggered with the second welding portion, the sixth welding portion is staggered with the third welding portion, and the seventh welding portion is staggered with the fourth welding portion.

16. The battery cover structure according to claim 15, characterized in that: The second welding portion is provided as one and is disposed adjacent to the first clearance notch; The third welding parts are provided in two pieces, and are respectively arranged adjacent to the first clearance notch and the second clearance notch; The fourth welding portion is provided as one, and is provided adjacent to a side of the third clearance notch away from the fool-proof notch; The fifth welding part, the sixth welding part and the seventh welding part are provided as one; The second welding portion, the third welding portion, the fourth welding portion, the fifth welding portion, the sixth welding portion, and the seventh welding portion each include at least one welding point.

17. The battery cover structure according to claim 16, characterized in that: At least one of the second welding portion, the third welding portion, the fourth welding portion, the fifth welding portion, the sixth welding portion, and the seventh welding portion includes 2-4 welding spots.

18. The battery cover structure according to claim 17, characterized in that: At least one of the second welding part, the third welding part, the fourth welding part, the fifth welding part, the sixth welding part and the seventh welding part includes three welding points distributed in a triangle, or four welding points distributed in an array.

19. The battery cover structure according to claim 16, characterized in that: The distance between the second welding portion and the first clearance gap is cmm, and the value range of c is 0.7-1.5; The third welding portion adjacent to the first clearance notch is at a distance of dmm from the first clearance notch, and the value range of d is 1.0-2.0; The distance between the third welding portion adjacent to the second clearance notch and the second clearance notch is emm, and the value range of e is 0.5-1.5; The distance between the fourth welding portion and the third clearance gap is fmm, and the value range of f is 0.5-1.

5.

20. The battery cover structure according to claim 13, characterized in that: The angle between two adjacent welding portions is α, and the range of α is 40°≤α≤110°.

21. The battery cover structure according to claim 2, characterized in that: The upper connecting plate and the lower connecting plate are respectively made of one of nickel and nickel alloy.

22. A button battery, characterized in that: It comprises a shell, a battery cell and a battery cover structure as described in any one of claims 1 to 21, wherein the battery cell is arranged in the shell, and the battery cover structure is sealingly covered on the shell.

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