CN109786593A - It rechargeable battery and its manufacturing method - Google Patents

Abstract

The present invention provides one kind rechargeable battery comprising: negative can has three-level hierarchic structure, first order ladder, second level ladder and the third level ladder successively to successively decrease from end including internal diameter in side wall；Plus plate current-collecting body, the plus plate current-collecting body are nested in the negative can；And sealing ring, the sealing ring, which is arranged between the side wall of the negative can and the side wall of the plus plate current-collecting body and is isolated the negative can and the plus plate current-collecting body, makes it not contact and short circuit occurs；Wherein the second level ladder of the sealing ring and the negative can fits closely, and forms the sealing of battery；The ends curved inwards of the first order ladder and be bonded with the sealing ring, formed sealing position；And the lower part of the sealing ring is resisted against on the interconnecting piece between the second level ladder and third level ladder, to be supported.The present invention also provides a kind of methods that manufactures and rechargeable battery.

Description

Rechargeable battery and method of making the same

technical field

The present invention relates to the field of small batteries, and more particularly, to a rechargeable battery and a manufacturing method thereof.

Background technique

There are many types of small rechargeable batteries available today. Taking a common lithium-ion battery as an example, its outer casing is usually a cylindrical tank. Tank material is iron nickel plated or stainless steel.

1 is a cross-sectional view of a small rechargeable lithium-ion battery fabricated according to the prior art. Rechargeable lithium-ion batteries are generally manufactured by:

After cutting the positive and negative electrodes as required, the ends are spot welded with the positive tabs 106 and the negative tabs 103 respectively. A separator is placed between the positive and negative electrode sheets, and the positive and negative electrode sheets with the separator added and placed are rolled into a battery pack 102 by winding. The lower insulating sheet 104 is placed at the bottom of the can body (ie, the negative terminal 1023 ), and the cell wrap 102 is loaded into the can body. The negative tab 103 is attached to the side wall of the can body by spot welding. Roll a circle at about 1-3mm (eg, 3mm) below the mouth of the can to form a radial direction with a width of about 0.8-2.5mm (eg, 2mm) and a depth of 0.5-1.5mm (eg, 1mm). The inwardly protruding groove is placed, and the upper insulating sheet 105 is placed under the groove and above the cell wrap 102 . Then, the positive current collector including the outer contact piece (positive terminal 1020 serving as the top cap), the inner contact piece (positive aluminum cap 1022 ), and the sealing ring 108 is put into the can. The positive current collector is supported by the protrusions of the groove. The outer contact sheet material is nickel-plated iron sheet, the inner contact sheet is aluminum sheet, and the sealing ring material is PP (polypropylene) or other plastic materials. After that, the positive electrode tab 106 wrapped with the positive electrode tape 1021 is passed through the upper insulating sheet 105 and connected to the positive electrode current collector by spot welding.

After spot welding the positive current collector, the entire battery was placed in an oven at 85°C for 24 to 36 hours. After cooling, add electrolyte in an environment with a relative humidity of 1% or less. Then, the positive electrode current collector was inserted through the mouth of the can body and combined with the can body. Bend the mouth of the can body with a sealing machine mold to complete the sealing of the battery.

The advantage of the above-mentioned lithium-ion battery is that the assembly technology is relatively mature and it is relatively easy to operate. However, as can be seen from the structure of FIG. 1 , the space occupied by the positive electrode current collector is large, so the overall space of the battery is small, resulting in a small battery capacity.

In addition, when the lithium-ion battery is overcharged and discharged, a large amount of gas may be generated inside the battery. When the gas reaches a certain pressure, the gas will break through the positive seal or the negative tank, resulting in an explosion. Generally, an explosion-proof device is installed on the positive electrode current collector for a larger lithium-ion battery, but for a small lithium-ion battery, an explosion-proof device cannot be installed because the positive electrode current collector is too small. Therefore, small lithium-ion batteries are likely to explode during charging and discharging, so there are hidden dangers in terms of safety.

Therefore, there is a need in the art for a rechargeable battery and a manufacturing method that can effectively utilize space, maximize battery capacity, and avoid explosion during charging and discharging.

SUMMARY OF THE INVENTION

One of the objects of the present invention is to provide a small rechargeable battery capable of effectively utilizing space and maximizing battery capacity, and a manufacturing method thereof. Additionally, a further object of the present invention is to provide a small rechargeable battery and a manufacturing method thereof that can effectively utilize space, maximize battery capacity, and avoid explosion during charging and discharging.

According to one aspect of the present invention, there is provided a rechargeable battery, which includes: a negative electrode can body, which has a three-level stepped structure at the mouth, and includes a first-level ladder and a second-level ladder with decreasing inner diameters from the end. and the third step; a positive electrode current collector, the positive electrode current collector is nested in the negative electrode tank; and a sealing ring, the sealing ring is provided at the mouth of the negative electrode tank body and the mouth of the positive electrode current collector between the parts and isolate the negative electrode can body and the positive electrode current collector so that they do not contact and cause a short circuit; wherein the sealing ring is closely attached to the second step of the negative electrode can body to form a sealing part of the battery; The end of the first step is bent inward to fit with the sealing ring to form a sealing position; and the lower part of the sealing ring abuts against the connection between the second step and the third step on the top for support.

Preferably, the negative electrode can body has at least one hole on the side wall of the first step.

Preferably, the sealing ring has a U-shaped groove, and the mouth of the positive electrode current collector is accommodated in the U-shaped groove. Preferably, the material of the sealing ring is an insulating compressible material.

Preferably, the positive electrode current collector has an inverted cup-shaped structure, and the diameter of the mouth of the cup-shaped structure is equal to or greater than the diameter of the bottom of the cup-shaped structure.

Preferably, the battery further includes a battery core wrap formed by a positive electrode sheet, a negative electrode sheet, and a separation mechanism between the positive electrode sheet and the negative electrode sheet.

Preferably, a positive electrode tab is extended from the end of the positive electrode sheet, which is connected with the positive electrode current collector; and a negative electrode tab is extended from the end of the negative electrode sheet, which is connected with the negative electrode can body.

Preferably, the battery further includes an upper insulating sheet placed above the cell wrap and a lower insulating sheet below the cell wrap.

Preferably, when the positive electrode current collector moves upward, the positive electrode tab connected to the positive electrode current collector is broken.

Preferably, the battery is a cylindrical battery, such as cylindrical.

Preferably, the battery is a lithium ion battery, more preferably a cylindrical lithium ion battery.

According to another aspect of the present invention, there is provided a method of manufacturing the rechargeable battery of the present invention.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a cross-sectional view of a small rechargeable lithium-ion battery fabricated in accordance with the prior art; and

2 is a cross-sectional view of a rechargeable lithium-ion battery according to one embodiment of the present invention.

Detailed ways

The following description is of typical embodiments of the invention and is not intended to limit the scope or applicability of the invention in any way. Rather, the following description is intended to provide examples of various embodiments for implementing the invention.

Hereinafter, the idea and concept of the present invention will be described in detail by taking a small cylindrical rechargeable lithium-ion battery as an example. However, as appreciated by those skilled in the art, the rechargeable battery of the present invention is not limited to small lithium-ion batteries, nor is it limited to columnar structures, and other battery structures (eg, button-like structures) and materials commonly used in the art are applicable.

The small lithium-ion battery of the present invention includes a negative electrode can body, the interior of which is configured to accommodate positive and negative electrode sheet wraps (ie, cell wraps). The positive and negative electrode sheet roll package includes a positive electrode sheet and a negative electrode sheet, and the two are separated by a separator. The positive and negative electrode sheets separated by the separator are wound into a cylindrical roll, which can then be wrapped with adhesive tape. A positive tab extends from the end of the positive pole piece, which is connected with the positive current collector. A negative electrode lug extends from the end of the negative electrode pole piece, which is connected with the can body. The positive and negative electrode sheet rolls can also be provided with an upper insulating sheet and a lower insulating sheet.

As shown in FIG. 2, in a preferred embodiment, the negative electrode can body 1 of the present invention has three steps at its mouth, including a first step 9, a second step 10 and The third step is 11. For example, the inner diameter of the second step 10 may be smaller than that of the first step 9 by about 0.05-0.20 mm, and smaller than that of the third step 11 by about 0.05-0.20 mm. Preferably, the inner diameter of the second step 10 may be about 3˜18 mm, depending on the size of the battery. The connecting portion between the second step 10 and the third step 11 can be used to support the bottom of the sealing ring 8 when the battery is installed.

Since the second step 10 presses the sealing ring 8 inward, a good seal between the negative electrode tank 1 and the positive electrode fluid 7 has been ensured. Therefore, there may be a gap between the first step 9 and the sealing ring, and there may be a gap in the gap. Can be filled without glue. Of course, in order to further strengthen the sealing, sealing glue can also be filled in the gap.

In a further preferred embodiment, the first step 9 may have at least one hole, the hole passing through the negative electrode can body 1 . In one aspect, 2 to 6 holes, preferably 4 holes, may be provided in the first step 9 . Preferably, the plurality of holes are circumferentially symmetrical. In one aspect, the hole diameter may be 0.10-0.8 mm. The holes may be circular, rectangular, square, prismatic or irregular in shape, preferably irregular.

The thickness of the negative electrode can body 1 can be about 0.10-0.30 mm, and the material can be iron plated with nickel or stainless steel.

In one embodiment, the positive electrode current collector 7 can be in the shape of an inverted cup, and the diameter of the mouth of the cup can be equal to or larger than the diameter of the bottom of the cup, preferably larger than the diameter of the bottom of the cup, for example, about 0.05-0.30 mm larger, preferably about 0.10-0.15 mm. mm. The material of the positive electrode current collector may be iron nickel-plated or stainless steel, and the thickness may be about 0.1-0.35 mm.

A sealing ring 8 may be provided between the side wall of the positive electrode current collector 7 and the mouth of the negative electrode can body 1 to seal the battery and prevent short circuit caused by the contact between the negative electrode can body 1 and the positive electrode top cover 7 . Preferably, the sealing ring 8 is an annular structure with a U-shaped groove. Preferably, the material of the sealing ring 8 is compressible.

More specifically, in one embodiment, the sealing ring 8 may have a U-shaped groove, and the thickness may be about 0.05-0.30 mm, preferably about 0.08-0.20 mm. The mouth of the cup can be inserted into the U-shaped groove of the sealing ring 8 . The inner surface of the sealing ring 8 can be in close contact with the outer surface of the cup mouth of the positive electrode current collector 7 . The outer diameter of the sealing ring 8 is preferably substantially the same as the inner diameter of the second step 10 of the negative electrode can body 1. For example, the outer diameter of the sealing ring 8 is the same as or 0.01-0.03 mm smaller than the second step 10 of the negative electrode can body 1 , the maximum does not exceed 0.10mm, otherwise it will affect the sealing performance of the battery. The sealing ring material can be polypropylene (PP) or polyetheretherketone (PEEK), or other elastic insulating materials that can be used.

Before the sealing ring 8 is combined with the positive electrode current collector 7, epoxy resin or other glue can be applied to the groove of the sealing ring 8, so that the two are tightly combined.

When the battery is assembled after adding the electrolyte, the positive electrode current collector 7 is inserted from the mouth of the negative electrode can body 1, and, for example, by pressurizing from above, the sealing ring 8 combined with the positive electrode current collector 7 is connected to the second stage of the negative electrode can body 1. The steps fit snugly and form the primary seal of the battery. The lower part of the sealing ring 8 abuts on the connecting part between the second step 10 and the third step 11 to obtain support.

Then, the first step 9 is narrowed with a sealing machine mold, so that the end of the first step 9 is bent inward, and is fitted with the sealing ring 8 to form a sealing position. At this time, the second step 10 of the negative electrode can body 1 will also be stretched inward by the force from the radial direction, compressing the sealing ring 8, so that the sealing ring 8 and the can wall are more closely attached, and the sealing performance is better. After being assembled in this way, the sealing ring 8 is compressed, and its compressed thickness is between 10% and 90% of the original thickness, especially between 30% and 70%, particularly preferably about 50%, so as to provide a good seal Effect.

Compared with the conventional structure lithium ion battery of the same volume, the lithium ion battery made with the above structure can increase the inner volume by at least about 10-12% or even higher, so the capacity can be greatly improved without increasing the battery size improve.

In addition, the lithium ion battery made with the above structure can improve the battery capacity and make the battery more safe and reliable. When the gas generated inside the battery pushes up the positive electrode current collector during overcharge and discharge, the positive electrode current collector will be separated from the second step of the negative electrode tank. When the first step is reached, the mouth of the cup will be blocked by the first step. The resulting seal gets stuck, and gas escapes from the air holes of the first step, eliminating the risk of the battery exploding due to excess air pressure. In addition, due to the existence of the gap between the first step and the sealing ring 8 and usually no glue is added, arranging the hole on the first step can prevent the glue from blocking the hole, and the existing gap also allows the internal air pressure to be initially released first .

In addition, in order to avoid overcharging and discharging of the battery, when the positive electrode current collector moves upward, the positive electrode tab connected to the positive electrode current collector or the negative electrode tab connected to the negative electrode can is broken. For example, a tear portion (eg, a tear line structure) can be provided between the positive electrode current collector and the positive electrode tab, which breaks when the positive electrode current collector moves outward a predetermined distance, thereby cutting the positive electrode tab and the positive electrode current collector. connection to avoid generating more gas and causing the battery to explode.

The present invention is described in more detail further below in conjunction with FIG. 2 . 2 is a cross-sectional view of a rechargeable lithium-ion battery according to an exemplary embodiment of the present invention. As shown in FIG. 2, a rechargeable lithium-ion battery includes a negative electrode casing, a positive electrode cap, and an insulating seal.

Example 1

The negative electrode shell is a cylindrical can body, that is, the negative electrode can body 1 . The negative electrode can body 1 is made of stainless steel with a thickness of 0.15 mm and a height of 24 mm. The negative electrode can body 1 as shown in FIG. 2 can be formed by, for example, a punching machine. The mouth of the negative electrode can body 1 has a three-stage ladder structure, including a first-stage ladder 9 , a second-stage ladder 10 and a third-stage ladder 11 whose inner diameters decrease in sequence. The inner diameter of the second step 10 is smaller than that of the first step 9 by 0.15 mm, and is larger than that of the third step 11 by 0.20 mm. The inner diameter of the second step 10 is 10mm, and the inner wall is coated with sealing glue. The side wall of the mouth of the negative electrode can body 1 also has at least one air hole 16 . In this embodiment, the air holes 16 are four in number and symmetrically arranged. The diameter of the air hole 16 is 0.5 mm.

The positive electrode sheet 13 and the negative electrode sheet 14 are cut as required, and spot welded to the positive electrode tab 6 and the negative electrode tab 3 respectively. A separator 15 is placed between the positive electrode sheet and the negative electrode sheet. Wind the positive and negative electrode sheets into a cylindrical wrap 2 and wrap them with adhesive tape. The height of the roll package 2 is the total height of the battery minus the thickness of the positive and negative electrode current collectors 7 and the two insulating sheets, and a space of about 0.5-1 mm is left.

First put the lower insulating sheet 4 on the inner bottom of the negative electrode can body 1 , and then put the roll pack 2 . Weld the negative electrode tab 3 to the can body. An upper insulating sheet 5 is placed on the upper part of the roll package 2 , and the positive electrode tabs 6 pass through the upper insulating sheet 5 and are welded with the positive electrode current collector 7 .

The positive electrode current collector 7 has an inverted cup-shaped structure, the outer diameter of the mouth of the cup is 0.15 mm larger than the outer diameter of the bottom of the cup, and the material is stainless steel with a thickness of 0.15 m.

Put the mouth of the positive electrode current collector 7 into the sealing ring 8 . The sealing ring 8 is an annular shape with a U-shaped groove, and the material is PP. Before being combined with the positive electrode current collector 7, a sealing glue 12 is applied to the groove to make the two tightly combined. The thickness of the sealing ring 8 is 0.15 mm, and its outer diameter is the same as or 0.02 mm smaller than the inner diameter of the second step 10 of the negative electrode can body 1 .

After spot welding the positive electrode current collector 7, the entire battery is placed in an oven at 85°C for 24-36 hours. After cooling, add electrolyte in an environment with a relative humidity of 1% or less. Then, the positive electrode current collector 7 is inserted from the mouth of the negative electrode can body 1, combined with the negative electrode can body 1, and then pressurized from the upper part, so that the sealing ring 8 is closely attached to the second step 10 of the negative electrode can body 1, and is pressed against the negative electrode can body 1. Rely on the connection between the second step and the third step 11 of the negative electrode can body 1 . Then, the first step 9 is narrowed inward by a sealing machine mold, so that the mouth of the first step 9 of the can body is bent inward to fit the sealing ring 8, and the sealing ring 8 is further squeezed.

Example 2

The negative electrode shell is a cylindrical can body, that is, the negative electrode can body 1 . The negative electrode can body 1 is made of stainless steel with a thickness of 0.15 mm and a height of 24 mm. The negative electrode can body 1 as shown in FIG. 2 can be formed by, for example, a punching machine. The mouth of the negative electrode can body 1 has a three-stage ladder structure, including a first-stage ladder 9 , a second-stage ladder 10 and a third-stage ladder 11 whose inner diameters decrease in sequence. The inner diameter of the second step 10 is smaller than that of the first step 9 by 0.15 mm, and is larger than that of the third step 11 by 0.20 mm. The inner diameter of the second step 10 is 10mm, and the inner wall is coated with sealing glue. The side wall of the mouth of the negative electrode can body 1 also has at least one air hole 16 . In this embodiment, the air holes 16 are four in number and symmetrically arranged. The diameter of the air hole 16 is 0.5 mm.

The positive electrode sheet 13 and the negative electrode sheet 14 are cut as required, and spot welded to the positive electrode tab 6 and the negative electrode tab 3 respectively. A separator 15 is placed between the positive electrode sheet and the negative electrode sheet. Wind the positive and negative electrode sheets into a cylindrical wrap 2 and wrap them with adhesive tape. The height of the roll package 2 is the total height of the battery minus the thickness of the positive and negative electrode current collectors 7 and the two insulating sheets, and a space of about 0.5-1 mm is left.

First put the lower insulating sheet 4 on the inner bottom of the negative electrode can body 1 , and then put the roll pack 2 . Weld the negative electrode tab 3 to the can body. An upper insulating sheet 5 is placed on the upper part of the roll package 2 , and the positive electrode tabs 6 pass through the upper insulating sheet 5 and are welded with the positive electrode current collector 7 .

The positive electrode current collector 7 has an inverted cup-shaped structure, the outer diameter of the mouth of the cup is 0.15 mm larger than the outer diameter of the bottom of the cup, and the material is stainless steel with a thickness of 0.15 m.

Put the mouth of the positive electrode current collector 7 into the sealing ring 8 . The sealing ring 8 is a ring with a U-shaped groove, and the material is polyetheretherketone PEEK. Since the sealing ring is tubular before it is combined with the positive electrode current collector 7 , it is first sleeved on the mouth of the positive electrode current collector 7 , and then bent and contracted inward with hot air to form a U-shaped groove, which is tightly connected with the positive electrode current collector 7 combine. The thickness of the sealing ring 8 is 0.08 mm, and its outer diameter is the same as or 0.02 mm smaller than the inner diameter of the second step 10 of the negative electrode can body 1 .

After spot welding the positive electrode current collector 7, the entire battery is placed in an oven at 85°C for 24-36 hours. After cooling, add electrolyte in an environment with a relative humidity of 1% or less. Then, the positive electrode current collector 7 is inserted from the mouth of the negative electrode can body 1, combined with the negative electrode can body 1, and then pressurized from the upper part, so that the sealing ring 8 is closely attached to the second step 10 of the negative electrode can body 1, and is pressed against the negative electrode can body 1. Rely on the connection between the second step and the third step 11 of the negative electrode can body 1 . Then, the first step 9 is narrowed inward by a sealing machine mold, so that the mouth of the first step 9 of the can body is bent inward to fit the sealing ring 8, and the sealing ring 8 is further squeezed.

Comparative Example (Existing Structure)

Figure 1 is a cross-sectional view of a small lithium-ion battery that is currently fabricated by conventional methods.

The negative electrode tank of the battery is a cylindrical tank, the tank material is a 0.15mm stainless steel sheet, the tank diameter is 10mm, and the height is 24mm.

After cutting the positive and negative electrodes as required, the ends are spot welded with the positive tabs 106 and the negative tabs 103 respectively. A separator is placed between the positive and negative electrode sheets, and the positive and negative electrode sheets with the separator added and placed are rolled into a battery pack 102 by winding. The lower insulating sheet 104 is placed at the bottom of the can body (ie, the negative terminal 1023 ), and the cell wrap 102 is loaded into the can body. The negative tab 103 is attached to the side wall of the can body by spot welding.

Roll a groove with a width of about 2mm and a depth of 1mm at about 3mm below the mouth of the can body, and then wrap the bottom of the upper insulating sheet 105 and the top of the cell 102 . The positive electrode tabs are connected to the positive electrode current collector 7 by spot welding through the upper insulating sheet 105 .

The positive electrode current collector 7 includes an outer contact piece 1020 and an inner contact piece 1022 , and a sealing ring 108 . The material of the outer contact sheet is nickel-plated iron sheet, the inner contact sheet is aluminum sheet, and the material of the sealing ring is PP. The positive current collector including the outer contact piece (positive terminal 1020 serving as the top cap), the inner contact piece (positive aluminum cap 1022), and the sealing ring 108 is placed into the can. The positive current collector is supported by the protrusions of the groove. The outer contact sheet material is nickel-plated iron sheet, the inner contact sheet is aluminum sheet, and the sealing ring material is PP (polypropylene) or other plastic materials. After that, the positive electrode tab 106 wrapped with the positive electrode tape 1021 is passed through the upper insulating sheet 105 and connected to the positive electrode current collector by spot welding.

After spot welding the positive current collector, the entire battery was placed in an oven at 85°C for 24 to 36 hours. After cooling, add electrolyte in an environment with a relative humidity of 1% or less. Then, the positive electrode current collector was inserted through the mouth of the can body and combined with the can body. Bend the mouth of the can body with a sealing machine mold to complete the sealing of the battery.

Results comparison

It can be seen from the comparison of the small lithium ion batteries ( FIG. 2 ) made in the above-mentioned examples 1 and 2 and the small lithium ion batteries ( FIG. 1 ) made in the comparative example (existing structure) that the volume of the two Basically the same, but the internal space of the battery of Example 1-2 is significantly larger than that of the comparative example, an increase of about 10-12%. In other words, under the same external volume, the internal space of the battery of the present invention is about 10-12% larger than that of the battery of the conventional structure. Correspondingly, the battery capacity can be increased by 10-12% under the condition of unchanged materials and formulations.

In addition, the lithium ion battery made with the above structure can improve the battery capacity and make the battery more safe and reliable. When the gas generated inside the battery pushes up the positive electrode current collector during overcharge and discharge, the positive electrode current collector will be separated from the second step of the negative electrode tank. When the first step is reached, the mouth of the cup will be blocked by the first step. The resulting seal gets stuck, and gas escapes from the air holes of the first step, eliminating the risk of the battery exploding due to excess air pressure.

Although the present invention is described through specific embodiments, those skilled in the art should understand that various changes and equivalent substitutions can be made to the present invention without departing from the scope of the present invention. In addition, various modifications or substitutions may be made to the present invention for specific situations or application requirements without departing from the scope of the present invention. Therefore, the inventions are not to be limited to the specific embodiments disclosed, but are to include all embodiments falling within the scope of the claims of this invention.

Claims (12)

1. one kind rechargeable battery, which is characterized in that described rechargeable battery include:

Negative can has three-level hierarchic structure, the first order rank successively successively decreased from oral area end including internal diameter in oral area Ladder, second level ladder and third level ladder；

Plus plate current-collecting body, the plus plate current-collecting body are nested in the negative can；With

Sealing ring, the sealing ring are arranged between the oral area of the negative can and the oral area of the plus plate current-collecting body and are isolated The negative can and the plus plate current-collecting body make it not contact and short circuit occurs；

Wherein the second level ladder of the sealing ring and the negative can fits closely, and forms the sealing of battery；

The ends curved inwards of the first order ladder and be bonded with the sealing ring, formed sealing position；

And the lower part of the sealing ring is resisted against on the interconnecting piece between the second level ladder and third level ladder, to obtain It must support.

2. according to claim 1 rechargeable battery, which is characterized in that the negative can is in the first order ladder Side wall on have at least one hole.

3. according to claim 1 or 2 rechargeable battery, which is characterized in that the sealing ring has U-shaped groove, institute The oral area for stating plus plate current-collecting body is contained in the U-shaped groove.

4. according to claim 1 or 2 rechargeable battery, which is characterized in that the material of the sealing ring is that insulation can Compression material.

5. according to claim 1 or 2 rechargeable battery, which is characterized in that the plus plate current-collecting body has back-off Cup-like structure, the diameter of the oral area of the cup-like structure are equal to or more than the diameter of the bottom of the cup-like structure.

6. according to claim 1 or 2 rechargeable battery, which is characterized in that the battery further includes by positive plate, bears Core coil packet made of partition winding between pole piece and positive plate and negative electrode tab.

7. according to claim 6 rechargeable battery, which is characterized in that extend positive pole ear from positive plate end, It connect with the plus plate current-collecting body；And extends negative lug from the negative electrode tab end, connect with the negative can It connects.

8. according to claim 7 rechargeable battery, which is characterized in that the battery further includes being placed in the core coil Lower insulating trip below the upper insulating trip for the side of wrapping and the core coil packet.

9. according to claim 7 rechargeable battery, which is characterized in that when the plus plate current-collecting body moves up, The positive pole ear fracture being connect with the plus plate current-collecting body.

10. according to claim 1 rechargeable battery, which is characterized in that the battery is column battery.

11. according to claim 1 rechargeable battery, which is characterized in that the battery is lithium ion battery.

12. a kind of manufacture the method that rechargeable battery described in any one of -11 according to claim 1.