CN112786973A

CN112786973A - Lamination buckle type lithium ion battery

Info

Publication number: CN112786973A
Application number: CN202110164290.3A
Authority: CN
Inventors: 常海涛; 李云星; 林新强
Original assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Current assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-05-11

Abstract

The invention discloses a laminated button type lithium ion battery which comprises a shell, a cover plate, a laminated battery cell and a negative pole. The housing has an opening. The cover plate covers the opening, so that an accommodating space is formed between the cover plate and the shell. The laminated cell is arranged in the accommodating space and provided with a middle passage for accommodating electrolyte, and the laminated cell is provided with a positive current collector and a negative current collector, wherein the positive current collector is connected to the shell. The negative pole post is arranged on the cover plate and connected to the negative current collector, penetrates through the cover plate and at least partially extends into the middle passage. According to the laminated button type lithium ion battery, the cathode pole protrudes downwards and partially enters the middle channel of the laminated battery core, and the middle channel can also store electrolyte, so that the utilization rate of the internal space is improved, and the capacity of the battery is high.

Description

Lamination buckle type lithium ion battery

Technical Field

The invention relates to the technical field of batteries, in particular to a laminated button type lithium ion battery.

Background

The current lamination button type lithium ion battery has wide application, but the main technology is monopolized by foreign manufacturers to form technical barrier blockade to domestic.

Domestic products have the defects of low space utilization rate, low battery capacity, high difficulty in forming battery packs and the like, and the actual commercial use value is not high.

Therefore, there is a need for a laminated lithium-ion button cell that at least partially addresses the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, the present invention provides a laminated button lithium ion battery comprising:

a housing having an opening;

a cover plate covering the opening such that an accommodating space is formed between the cover plate and the case;

the laminated cell is arranged in the accommodating space and is provided with a middle passage for accommodating electrolyte, and the laminated cell is provided with a positive current collector and a negative current collector, wherein the positive current collector is connected to the shell;

and the negative pole column is arranged on the cover plate and connected to the negative current collector, and penetrates through the cover plate and at least partially extends into the middle passage.

Further, the lamination buckle type lithium ion battery further comprises an insulating sleeve, the insulating sleeve is arranged between the cover plate and the negative pole post, and the insulating sleeve radially surrounds the negative pole post.

Further, the negative electrode post includes:

an exposed portion that is lapped to the insulating sleeve;

the extension part is arranged below the exposed part, the extension part partially enters the middle channel, and the radial dimension of the extension part is smaller than that of the exposed part.

Further, the cover plate is provided with a countersunk hole, and the insulating sleeve comprises:

the main body part is arranged at the step of the countersunk hole, a through hole is formed in the middle of the main body part, and the extending part penetrates through the through hole;

an accommodating portion connected to an outer edge of the main body portion and protruding upward, the exposing portion being provided to the main body portion and surrounded by the accommodating portion;

the connecting part is connected to the inner edge of the main body part, extends downwards from the main body part and is turned outwards so as to be embedded with the inner edge of the countersunk hole.

Further, the air conditioner is provided with a fan,

the exposed part protrudes out of the upper surface of the cover plate; or

The upper surface of the exposed part is flush with the upper surface of the cover plate.

Further, the laminated cell further includes:

the positive plates are provided with positive leading-out tabs;

at least two negative plates, wherein the negative plates are provided with negative leading-out tabs;

wherein, positive plate with negative pole piece stacks in turn, just anodal draw forth utmost point ear with the setting of staggering of negative pole draw forth utmost point ear, and anodal mass flow body welds extremely anodal draw forth utmost point ear, in order to incite somebody to action two at least positive plate link together, the welding of negative pole mass flow body extremely the utmost point ear is drawn forth to the negative pole, in order to incite somebody to action two at least negative pole pieces link together.

Further, the laminated battery cell further comprises a pocket type diaphragm, the pocket type diaphragm covers the positive plate, and the area of the pocket type diaphragm is larger than that of the positive plate.

Further, the positive plate and/or the negative plate are annular, an annular middle hole forms the middle channel, the annular shape is provided with two mutually staggered gaps, and the positive pole leading-out tab and/or the negative pole leading-out tab are arranged at the gaps.

Further, the apron is provided with annotates the liquid mouth, it is provided with the ball sealer to annotate liquid mouth department, the diameter of ball sealer is greater than annotate the diameter of liquid mouth.

Further, the lamination button type lithium ion battery further comprises an insulating surface pad, and the insulating surface pad is attached to the inner side of the cover plate.

According to the laminated button type lithium ion battery, the cathode pole protrudes downwards and partially enters the middle channel of the laminated battery core, and the middle channel can also store electrolyte, so that the utilization rate of the internal space is improved, and the capacity of the battery is high.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

fig. 1 is a schematic structural view of a laminated button lithium ion battery according to a preferred embodiment of the present invention;

FIG. 2 is a schematic top view of the positive electrode sheet of FIG. 1, further showing a pocket-type separator;

FIG. 3 is a schematic top view of the negative plate of FIG. 1; and

fig. 4 is a schematic perspective view of the laminated cell in fig. 1.

Description of reference numerals:

100: lamination button lithium ion battery 110: shell body

120: cover plate 130: the negative electrode post 131: exposed part

132: extension 140: insulating sleeve 141: main body part

142: the accommodating portion 143: connecting part 150: liquid filling port

151: sealing ball 160: insulating surface pad 170: laminated battery cell

171: positive electrode tab 172: positive electrode lead-out tab 173: positive current collector

174: negative electrode tab 175: negative electrode lead-out tab 176: negative current collector

177: pocket diaphragm 178: notch 179: hole(s)

180: middle channel

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. It is apparent that the implementation of the embodiments of the invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. Fig. 1 to 4 show a laminated button lithium ion battery according to a preferred embodiment of the present invention.

Refer to fig. 1. The laminated button-type lithium ion battery 100 includes a case 110, a cap plate 120, a laminated cell 170, a negative electrode post 130, and an insulating sleeve 140.

The housing 110 has an opening, which is generally configured like a cylinder or a cylinder with the opening facing upward. The cover plate 120 can cover the opening, and when the cover plate 120 covers the opening, an accommodating space is formed between the cover plate 120 and the housing 110. The thickness of the bottom of the housing 110 may be 0.1-0.2 mm, and the thickness of the wall of the housing 110 may be 0.1-0.3 mm. The thickness of the cover plate 120 may be 0.6 to 2.0 mm. This makes it possible to use the volume of the battery to the maximum extent by making the battery thinner.

The cover plate 120 is further provided with an insulating sleeve 140 and a cathode post 130. The negative electrode post 130 penetrates through the cover plate 120 and extends into the accommodating space. That is, the negative electrode post 130 is partially exposed to the outside and partially located in the battery. The insulating sleeve 140 is disposed between the cover plate 120 and the negative electrode post 130, and radially surrounds the negative electrode post 130 to prevent the negative electrode post 130 from being electrically connected to the cover plate 120.

The laminated cell 170 and the electrolyte are disposed in the accommodation space. The middle part of the laminated cell 170 is provided with a middle passage 180 to accommodate the electrolyte, so that the space utilization rate is improved. And, the negative terminal post 130 extends partially into the central passage 180. The laminated cell 170 has a positive current collector 173 and a negative current collector 176, where the positive current collector 173 is connected to the casing 110 or the cap plate 120 and the negative current collector 176 is connected to the negative electrode post 130.

Preferably, an insulating face pad 160 is attached to the inner side of the cap plate 120 to prevent a short circuit between the laminated cell 170 and the cap plate 120.

According to the laminated button type lithium ion battery 100, the cathode terminal 130 protrudes downwards and partially enters the middle channel 180 of the laminated battery core 170, and the middle channel 180 can store electrolyte, so that the utilization rate of the internal space is improved, and the capacity of the battery is high. And thus the cover plate 120 can be made thinner, further utilizing space efficiently.

In particular, continued reference is made to fig. 1. In order to facilitate the installation of the insulating sheath 140 and the cathode terminal 130, the cover plate 120 is provided with a countersunk hole. The insulation sleeve 140 is disposed at and passes through the countersunk hole, and the cathode terminal 130 penetrates through the insulation sleeve 140 to enter the receiving space.

The insulating sheath 140 includes a body portion 141, a receiving portion 142, and a connecting portion 143. The main body 141 is disposed at a step of the countersunk hole and forms a platform. The body portion 141 has a through-hole in the middle thereof so that the negative electrode post 130 can enter the receiving space through the through-hole. The receiving portion 142 is provided at an outer edge of the body portion 141 and protrudes upward, and is substantially configured as a flange. The connecting portion 143 is located at the inner edge of the main body 141 (the edge of the through hole), and the connecting portion 143 extends downward from the main body 141 and is folded outward in a direction away from the through hole to engage with the inner edge of the countersunk hole.

The negative electrode post 130 is configured substantially in a "T" shape, and includes an exposed portion 131 and an extended portion 132 connected to the bottom of the exposed portion 131. Wherein the radial dimension of the extension portion 132 is smaller than the radial dimension of the exposed portion 131. The exposed portion 131 is disposed on a platform formed by the main body portion 141 of the insulating sheath 140 and surrounded by the accommodating portion 142. The extension 132 passes through the through hole of the insulating sleeve 140 into the receiving space and partially into the central channel 180 of the laminated cell 170.

The extension part 132 protrudes downward beyond the bottom surface of the cover plate 120, preferably, the size is 0.5-1.5 mm, and the diameter of the extension part 132 is preferably 1.5-3.0 mm.

In a preferred embodiment, the exposed portion 131 protrudes from the upper surface of the cover plate 120, thereby facilitating packaging and packaging operations when a plurality of batteries are assembled into a battery pack or a battery pack.

In another alternative embodiment, the upper surface of the exposed portion 131 is flush with the upper surface of the cap plate 120 to maximally utilize the space inside the battery.

Please refer to fig. 1, fig. 2, fig. 3 and fig. 4. The laminated cell 170 further includes at least two positive tabs 171 and at least two negative tabs 174. Or laminated cell 170, may have a plurality of positive tabs 171 and a plurality of negative tabs 174. And the positive electrode tabs 171 and the negative electrode tabs 174 are alternately stacked.

The positive electrode sheet 171 is covered with a pocket-type separator 177. Or, the upper side and the lower side of the positive plate 171 are both provided with a membrane with an area larger than that of the positive plate 171, the edge of the membrane exceeds the edge of the positive plate 171 by about 0.5-2.0 mm, and the two membranes form the pocket-type diaphragm 177. Therefore, the sealing performance is improved, and the probability of short circuit is reduced.

The positive electrode tab 171 has a positive electrode lead tab 172, and the corresponding negative electrode tab 174 has a negative electrode lead tab 175. The positive electrode lead tab 172 and the negative electrode lead tab 175 are disposed in opposite directions to prevent interference and short circuit. Wherein a positive electrode current collector 173 is welded to a positive electrode lead-out tab 172 to connect all the positive electrode tabs 171 together, and a negative electrode current collector 176 is welded to a negative electrode lead-out tab 175 to connect all the negative electrode tabs 174 together. Therefore, the current collector is welded with all the corresponding lead-out tabs, the conductive area is increased, and the performance requirement during high-rate charge and discharge can be met. The positive and negative electrode tabs may be configured in a rectangular shape to facilitate welding.

The welding method may be laser welding, ultrasonic welding, spot welding, or the like, and is not limited herein.

The positive and

negative plates

171, 174 are each preferably configured in the shape of a ring, with a central aperture 179 in the shape of a ring that overlaps to form the central channel 180 described above. The diameter of the annular middle hole 179 is preferably 1.8-4 mm, and the diameter of the middle channel 180 is preferably 1.8-4 mm. More preferably, the diameter of the annular middle hole 179 is 0.2-1.0 mm larger than that of the negative electrode post 130, so as to make the most of the space and store more electrolyte.

Two notches 178 are provided in a ring shape so as to be offset from each other, and a positive lead tab 172 and a negative lead tab 175 are provided at the notches 178. The size of the gap 178 is preferably 0.2-2.0 mm. Preferably, the two indentations 178 are oppositely disposed.

In addition, continued reference is made to fig. 1. In order to facilitate the injection of the electrolyte during the production, the cover plate 120 is provided with an injection port 150. A sealing ball 151 is preferably provided at the injection port 150 to seal after the injection of the electrolyte is completed. Preferably, the sealing ball 151 has a diameter larger than that of the pouring outlet 150.

Illustratively, the diameter of the liquid inlet 150 may be 0.5 to 1.5mm, and the diameter of the sealing ball 151 may be 0.2 to 0.5mm larger than the diameter of the liquid inlet 150. Alternatively, the diameter of the sealing ball 151 may be 0.7 to 2.0 mm. Thus, the sealing is achieved by interference fit of the sealing ball 151 with the pouring outlet 150.

The preparation method of the laminated button lithium ion battery 100 of the invention is as follows:

the center of the diaphragm and the positive plate 171 are provided with small holes, and the positive plate 171 is wrapped and fixed by two layers of diaphragms to form a pocket type diaphragm 177, so that only the positive leading-out tab 172 is exposed.

The negative electrode sheet 174 is also provided with a small hole in the middle thereof, and has a diameter and a position corresponding to those of the positive electrode sheet 171. A negative lead tab 175 is left on one side of the negative plate 174.

A plurality of positive electrode sheets 171 (coated pocket type separators 177) and negative electrode sheets 174 of the same number are alternately stacked, and a plurality of positive electrode lead-out tabs 172 and a plurality of negative electrode lead-out tabs 175 are respectively aligned up and down when stacked, and the positive electrode lead-out tabs 172 and the negative electrode lead-out tabs 175 are staggered.

The positive electrode sheets 171 and the negative electrode sheets 174 which are orderly stacked are put into a lamination machine to be fixed to form the cylindrical laminated cell 170.

The positive electrode tab 172 of the plurality of positive electrode sheets 171 is welded to a single metal strip to form a positive electrode current collector 173. The end of the positive electrode collector 173 is welded to the case 110 or the cap plate 120, or welded to the gap between the case 110 and the cap plate 120.

The negative lead tabs 175 of the plurality of negative plates 174 are welded to form a single metal strip, forming a negative current collector 176. The negative current collector 176 is folded over from the top of the laminated cell 170 toward the center and welded to the negative electrode post 130.

The laminated cell 170 is then placed in the housing 110, and the cover plate 120 is closed and sealed by welding or the like.

After the assembled battery is baked, a certain amount of electrolyte is injected through the injection port 150 of the cover plate 120. After the liquid injection is completed, the liquid injection port 150 is sealed with a sealing ball 151.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A laminated button lithium ion battery comprising:

a housing having an opening;

2. The laminated button lithium ion battery of claim 1, further comprising an insulating sleeve disposed between the cover plate and the negative terminal post, the insulating sleeve radially surrounding the negative terminal post.

3. The laminated button lithium ion battery of claim 2, wherein the negative terminal post comprises:

an exposed portion that is lapped to the insulating sleeve;

4. The laminated button lithium ion battery of claim 3, wherein the cover plate is countersunk, and the insulating sleeve comprises:

5. The laminated button lithium ion battery according to claim 3 or 4,

the exposed part protrudes out of the upper surface of the cover plate; or

6. The laminated button lithium ion battery of claim 1, wherein the laminated cell further comprises:

the positive plates are provided with positive leading-out tabs;

7. The laminated button lithium ion battery of claim 6, wherein the laminated cell further comprises a pocket-type diaphragm, the pocket-type diaphragm covers the positive plate, and the area of the pocket-type diaphragm is larger than that of the positive plate.

8. The laminated button lithium ion battery according to claim 6 or 7, wherein the positive plate and/or the negative plate is configured in a ring shape, the middle hole of the ring shape forms the middle channel, the ring shape is provided with two notches staggered from each other, and the positive lead-out tab and/or the negative lead-out tab are/is arranged at the notches.

9. The laminated button lithium ion battery according to claim 1, wherein the cover plate is provided with a liquid injection port, and a sealing ball is arranged at the liquid injection port, and the diameter of the sealing ball is larger than that of the liquid injection port.

10. The laminated button lithium ion battery of claim 1, further comprising an insulating face pad affixed to the inside of the cover plate.