CN217507386U - Lithium ion battery and pole piece structure thereof - Google Patents
Lithium ion battery and pole piece structure thereof Download PDFInfo
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- CN217507386U CN217507386U CN202220727458.7U CN202220727458U CN217507386U CN 217507386 U CN217507386 U CN 217507386U CN 202220727458 U CN202220727458 U CN 202220727458U CN 217507386 U CN217507386 U CN 217507386U
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Abstract
The application provides a lithium ion battery and a pole piece structure thereof. The pole piece structure of the lithium ion battery comprises a pole piece current collector, an active substance layer and an insulating layer. The active material layer comprises a first active material layer, a second active material layer, a third active material layer and a fourth active material layer, the first active material layer and the second active material layer are respectively attached to two surfaces of the pole piece current collector, the third active material layer is attached to one surface, away from the pole piece current collector, of the second active material layer, the fourth active material layer is attached to one surface, away from the pole piece current collector, of the first active material layer, the fourth active material layer is parallel and level to the first active material layer, and a blank area is reserved on one surface, close to the fourth active material layer and the first active material layer, of the current collector; the insulating layer is attached to the blank area, and the insulating layer is flush with the junction of the fourth active material layer and the first active material layer respectively. The pole piece structure can improve the safety performance and the electrical performance of the battery and can also ensure that the positive pole piece is not overvoltage.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a lithium ion battery and pole piece structure thereof.
Background
The conventional positive plate of the current lithium ion battery is to coat an active substance on an aluminum foil, but the safety performance of the battery is more and more difficult to ensure along with the improvement of the capacity of the lithium ion battery; in order to improve the safety performance of the battery, the prior proposal 1 (application number: CN201821812658.2) proposes a new positive pole piece structure, which has two active materials and an insulating material layer, wherein the second positive active material layer is on the first active material layer, the first active material layer covers the position of the current collector, and the insulating material layer covers the position of the current collector; a gap is formed between the first active material layer and the insulating layer; although the safety performance of the battery is improved by the structure, the safety performance cannot be ensured if the first active material layer and the insulating layer are punctured by a needle due to the gap, so that the structure has defects;
the former case 2 has between first active material layer and the insulating layer to pile up each other and form overlap portion on the basis of former case 1, though this kind of structure can improve the security performance, overlap the increase that can increase the thickness here to lead to the pole piece to have the risk of excessive pressure when colding pressing, and then influence electric core performance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, providing one kind and not only can improving lithium ion battery's security, can also avoid positive pole piece overvoltage to appear, improve pole piece structural stability's lithium ion battery and pole piece structure thereof.
The purpose of the utility model is realized through the following technical scheme:
a pole piece structure of a lithium ion battery, comprising:
the electrode plate current collector is provided with a first coating area and a second coating area, and the first coating area and the second coating area are respectively positioned on two opposite surfaces of the electrode plate current collector;
the active material layer comprises a first active material layer, a second active material layer, a third active material layer and a fourth active material layer, the first active material layer is attached to the first coating area, the second active material layer is attached to the second coating area, the third active material layer is attached to one surface, deviating from the pole piece current collector, of the second active material layer, the fourth active material layer is attached to one surface, deviating from the pole piece current collector, of the first active material layer, the fourth active material layer is flush with the first active material layer, and a blank area is reserved on one surface, close to the fourth active material layer and the first active material layer, of the current collector;
the insulating layer, the insulating layer laminating in blank area, just the insulating layer respectively with fourth active material layer with first active material layer juncture parallel and level.
In one embodiment, the first coating region is substantially coincident with the second coating region, and the first active material layer completely covers the first coating region and the second active material layer completely covers the second coating region.
In one embodiment, the third active material layer completely covers the second active material layer, and the fourth active material layer completely covers the first active material layer.
In one embodiment, the thickness of the first active material layer is equal to the thickness of the second active material layer.
In one embodiment, the thickness of the third active material layer is equal to the thickness of the fourth active material layer.
In one embodiment, the insulating layer has a thickness greater than that of the first active material layer.
In one embodiment, one end of the first active material layer is flush with one end of the second active material layer, the other end of the first active material layer abuts against the insulating layer, and the sum of the lengths of the first active material layer and the insulating layer is equal to the length of the second active material layer.
In one embodiment, one end of the fourth active material layer is flush with an end of the first active material layer adjacent to the insulating layer.
In one embodiment, the fourth active material layer covers the surface of the first active material layer.
The present application further provides a lithium ion battery, which includes the pole piece structure according to any one of the above embodiments.
Compared with the prior art, the utility model discloses at least, following advantage has:
the utility model discloses an among lithium ion battery's the pole piece structure, first active material layer laminating is in first coating district, second active material layer laminating is in second coating district, third active material layer laminating is in the one side that second active material layer deviates from the pole piece mass flow body, fourth active material layer laminating is in the one side that first active material layer deviates from the pole piece mass flow body, fourth active material layer and first active material layer parallel and level, the mass flow body is close to the one side on fourth active material layer and first active material layer and leaves blank area, the insulating layer laminating is in blank area, and the insulating layer respectively with fourth active material layer and first active material layer juncture parallel and level. That is to say, the first active material layer, the fourth active material layer and the insulating layer are not overlapped, and no gap exists between the first active material layer, the fourth active material layer and the insulating layer; in addition, above-mentioned pole piece structure makes the pole piece prevent that the acupuncture leads to the fact the short circuit in, can also be favorable to improving the planarization and the stability of pole piece roll-in, avoids the pole piece to have the risk of excessive pressure when colding pressing, and then guarantees lithium ion battery's performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a pole piece structure of a lithium ion battery in an embodiment;
fig. 2 is a schematic diagram of another structure of the pole piece of the lithium ion battery shown in fig. 1.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all 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 in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a pole piece structure of a lithium ion battery. The pole piece structure of the lithium ion battery comprises a pole piece current collector, an active substance layer and an insulating layer. The pole piece current collector is provided with a first coating area and a second coating area, and the first coating area and the second coating area are respectively positioned on two opposite surfaces of the pole piece current collector; the active material layer comprises a first active material layer, a second active material layer, a third active material layer and a fourth active material layer, the first active material layer is attached to the first coating area, the second active material layer is attached to the second coating area, the third active material layer is attached to one surface, away from the pole piece current collector, of the second active material layer, the fourth active material layer is attached to one surface, away from the pole piece current collector, of the first active material layer, the fourth active material layer is flush with the first active material layer, and a blank area is reserved on one surface, close to the fourth active material layer and the first active material layer, of the current collector; the insulating layer is attached to the blank area, and the insulating layer is flush with the junction of the fourth active material layer and the first active material layer respectively.
As shown in fig. 1, a pole piece structure 10 of a lithium ion battery of an embodiment includes a pole piece current collector 100, an active material layer 200, and an insulating layer 300. The pole piece current collector 100 is provided with a first coating area and a second coating area, and the first coating area and the second coating area are respectively positioned on two opposite surfaces of the pole piece current collector 100; the active material layer 200 comprises a first active material layer 210, a second active material layer 220, a third active material layer 230 and a fourth active material layer 240, the first active material layer 210 is attached to the first coating area, the second active material layer 220 is attached to the second coating area, the third active material layer 230 is attached to one side, away from the pole piece current collector 100, of the second active material layer 220, the fourth active material layer 240 is attached to one side, away from the pole piece current collector 100, of the first active material layer 210, the fourth active material layer 240 is flush with the first active material layer 210, and a blank area is left on one side, close to the fourth active material layer 240 and the first active material layer 210, of the current collector; the insulating layer 300 is attached to the blank area, and the insulating layer 300 is flush with the interface between the fourth active material layer 240 and the first active material layer 210.
In the above-mentioned pole piece structure 10 of lithium ion battery, first active material layer 210 is laminated in first coating district, second active material layer 220 is laminated in second coating district, third active material layer 230 is laminated in the one side that second active material layer 220 deviates from pole piece mass collector 100, fourth active material layer 240 is laminated in the one side that first active material layer 210 deviates from pole piece mass collector 100, fourth active material layer 240 and first active material layer 210 parallel and level, the current collector is close to fourth active material layer 240 and leaves blank space with the one side of first active material layer 210, insulating layer 300 is laminated in blank space, and insulating layer 300 is respectively with fourth active material layer 240 and first active material layer 210 juncture parallel and level. That is, the first active material layer 210, the fourth active material layer 240 and the insulating layer 300 are not overlapped, and there is no gap between them, and the first active material layer 210, the fourth active material layer 240 and the insulating layer 300 form a mutually flush structure, so that the pole piece structure can effectively prevent the short circuit problem caused by needle punching, and improve the safety of the lithium ion battery; in addition, above-mentioned pole piece structure makes the pole piece prevent that the acupuncture leads to the fact the short circuit in, can also be favorable to improving the planarization and the stability of pole piece roll-in, avoids the pole piece to have the risk of excessive pressure when colding pressing, and then guarantees lithium ion battery's performance.
In one embodiment, the first coating region completely coincides with the second coating region, and the first active material layer 210 completely covers the first coating region and the second active material layer 220 completely covers the second coating region. In this embodiment, the first coating region is a contact area between the first active material layer 210 and the pole piece current collector 100, i.e. a first contact area; the second coating area is a contact area between the second active material layer 220 and the pole piece current collector 100, i.e., a second contact area. Because first active material layer 210 covers first coating region completely, second active material layer 220 covers the second completely and coats the district, and first coating region is identical with the second coating region completely again, consequently first area of contact equals second area of contact to improve the pressure uniformity between pole piece mass collector 100 and first active material layer 210 and second active material layer 220 in the roll-in process, and then improve the uniformity and the stability of pole piece structure.
Further, the third active material layer 230 completely covers the second active material layer 220, and the fourth active material layer 240 completely covers the first active material layer 210. In the present embodiment, the third active material layer 230 completely covers the second active material layer 220, i.e., the contact area between the third active material layer 230 and the second active material layer 220 is equal to the second contact area; fourth active material layer 240 completely covers first active material layer 210, i.e., the contact area between fourth active material layer 240 and first active material layer 210 is equal to the first contact area. That is to say, first active material layer 210, second active material layer 220, third active material layer 230 and fourth active material layer 240 have better flatness and uniformity therebetween, so as to improve the pressure uniformity between electrode sheet current collector 100 and first active material layer 210, second active material layer 220, third active material layer 230 and fourth active material layer 240 during the rolling process, thereby improving the uniformity and stability of the electrode sheet structure.
In one embodiment, the thickness of first active material layer 210 is equal to the thickness of second active material layer 220. In this embodiment, the first active material layer 210 is attached to the first coating region, and the second active material layer 220 is attached to the second coating region, that is, the first active material layer 210 and the second active material layer 220 are respectively located on two opposite surfaces of the pole piece current collector 100. In the rolling process, because the thickness of the first active material layer 210 is equal to that of the second active material layer 220, the pressures applied to the two sides of the pole piece current collector 100 are consistent, and the pole piece structure has good symmetry, thereby improving the consistency and stability of the pole piece structure.
Further, the thickness of the third active material layer 230 is equal to that of the fourth active material layer 240. In this embodiment, third active material layer 230 completely covers second active material layer 220, and fourth active material layer 240 completely covers first active material layer 210, that is, first active material layer 210 and second active material layer 220 are respectively located on two opposite surfaces of pole piece current collector 100. In the rolling process, since the thickness of the third active material layer 230 is equal to the thickness of the fourth active material layer 240, the pressures applied to the two sides of the pole piece current collector 100 are the same, and the pole piece structure has better symmetry, thereby improving the consistency and stability of the pole piece structure. In addition, two opposite surfaces of the pole piece current collector 100 are both provided with the double active material layers 200, so that the stability and the electrical property of the pole piece structure can be effectively improved, and the protection of the active material layers 200 to the pole piece structure is improved.
In one embodiment, the thickness of the insulating layer 300 is greater than the thickness of the first active material layer 210. It can be understood that, if the thickness of the insulating layer 300 is less than or equal to the thickness of the first active material layer 210, when the second active material layer 220 is coated, since the insulating layer 300 is flush with the interface between the fourth active material layer 240 and the first active material layer 210, the second active material layer 220 is easily overlapped with the insulating layer 300, although this structure can improve the safety performance, the overlapping can increase the thickness at this position, thereby causing the risk of overvoltage when the pole piece is cold-pressed, and further affecting the performance of the battery cell. In order to avoid the risk of overvoltage when the pole piece is cold-pressed, in this embodiment, the thickness of the insulating layer 300 is greater than that of the first active material layer 210, so that the second active material layer 220 can be effectively overlapped with the insulating layer 300, the risk of overvoltage when the pole piece is cold-pressed is avoided, and the performance stability of the lithium ion battery cell is ensured.
In one embodiment, one end of the first active material layer 210 is flush with one end of the second active material layer 220, the other end of the first active material layer 210 abuts against the insulating layer 300, and the sum of the lengths of the first active material layer 210 and the insulating layer 300 is equal to the length of the second active material layer 220. It can be understood that the first active material layer 210 and the second active material layer 220 are respectively located on two sides of the pole piece current collector 100, and the insulating layer 300 is respectively flush with the interface between the fourth active material layer 240 and the first active material layer 210. In order to further improve the leveling property of the pole piece structure, in this embodiment, one end of the first active material layer 210 is leveled with one end of the second active material layer 220, the other end of the first active material layer 210 is abutted to the insulating layer 300, and the sum of the lengths of the first active material layer 210 and the insulating layer 300 is equal to the length of the second active material layer 220, so that the leveling property among the first active material layer 210, the second active material layer 220 and the insulating layer 300 can be effectively improved, and the leveling property of the pole piece structure is further improved.
As shown in fig. 2, in one embodiment, a fourth active material layer 240 covers the surface of the first active material layer 210. It can be understood that the fourth active material layer 240 is attached to the surface of the first active material layer 210 away from the pole piece current collector 100, the fourth active material layer 240 is flush with the first active material layer 210, a blank area is left on the surface of the current collector close to the fourth active material layer 240 and the first active material layer 210, the insulating layer 300 is attached to the blank area, and the insulating layer 300 is flush with the junction of the fourth active material layer 240 and the first active material layer 210 respectively. In this embodiment, the fourth active material layer 240 covers the surface of the first active material layer 210, so that the insulating layer 300 can be effectively prevented from overlapping with the first active material layer 210 or the second active material layer 220, the risk of overvoltage when the pole piece is cold-pressed is better avoided, and the performance stability of the lithium ion battery cell is ensured.
The present application further provides a lithium ion battery including the pole piece structure of any of the above embodiments.
Compared with the prior art, the utility model discloses at least, following advantage has:
the utility model discloses an among lithium ion battery's the pole piece structure, first active substance layer 210 laminates in first coating district, second active substance layer 220 laminates in second coating district, third active substance layer 230 laminates in the one side that second active substance layer 220 deviates from pole piece mass flow body 100, fourth active substance layer 240 laminates in the one side that first active substance layer 210 deviates from pole piece mass flow body 100, fourth active substance layer 240 and first active substance layer 210 parallel and level, the mass flow body leaves blank area near the one side of fourth active substance layer 240 with first active substance layer 210, insulating layer 300 laminates in blank area, and insulating layer 300 respectively with fourth active substance layer 240 and first active substance layer 210 juncture parallel and level. That is, the first active material layer 210, the fourth active material layer 240 and the insulating layer 300 are not overlapped, and there is no gap between them, and the first active material layer 210, the fourth active material layer 240 and the insulating layer 300 form a mutually flush structure, so that the pole piece structure can effectively prevent the short circuit problem caused by needle punching, and improve the safety of the lithium ion battery; in addition, above-mentioned pole piece structure makes the pole piece prevent that the acupuncture leads to the fact the short circuit in, can also be favorable to improving the planarization and the stability of pole piece roll-in, avoids the pole piece to have the risk of excessive pressure when colding pressing, and then guarantees lithium ion battery's performance.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A pole piece structure of a lithium ion battery is characterized by comprising:
the electrode plate current collector is provided with a first coating area and a second coating area, and the first coating area and the second coating area are respectively positioned on two opposite surfaces of the electrode plate current collector;
the active material layer comprises a first active material layer, a second active material layer, a third active material layer and a fourth active material layer, the first active material layer is attached to the first coating area, the second active material layer is attached to the second coating area, the third active material layer is attached to one surface, deviating from the pole piece current collector, of the second active material layer, the fourth active material layer is attached to one surface, deviating from the pole piece current collector, of the first active material layer, the fourth active material layer is flush with the first active material layer, and a blank area is reserved on one surface, close to the fourth active material layer and the first active material layer, of the current collector;
the insulating layer, the insulating layer laminating in blank area, just the insulating layer respectively with fourth active material layer with first active material layer juncture parallel and level.
2. The pole piece structure of the lithium ion battery of claim 1, wherein the first coating region is identical to the second coating region, and the first active material layer completely covers the first coating region and the second active material layer completely covers the second coating region.
3. The pole piece structure of the lithium ion battery according to claim 2, wherein the third active material layer completely covers the second active material layer, and the fourth active material layer completely covers the first active material layer.
4. The pole piece structure of the lithium ion battery according to claim 2, wherein a thickness of the first active material layer is equal to a thickness of the second active material layer.
5. The pole piece structure of the lithium ion battery according to claim 3, wherein the thickness of the third active material layer is equal to the thickness of the fourth active material layer.
6. The pole piece structure of the lithium ion battery of claim 1, wherein a thickness of the insulating layer is greater than a thickness of the first active material layer.
7. The pole piece structure of the lithium ion battery according to claim 1, wherein one end of the first active material layer is flush with one end of the second active material layer, the other end of the first active material layer abuts against the insulating layer, and the sum of the lengths of the first active material layer and the insulating layer is equal to the length of the second active material layer.
8. The pole piece structure of the lithium ion battery of claim 7, wherein one end of the fourth active material layer is flush with one end of the first active material layer close to the insulating layer.
9. The pole piece structure of the lithium ion battery of claim 7, wherein the fourth active material layer covers the surface of the first active material layer.
10. A lithium ion battery, characterized in that the lithium ion battery comprises a pole piece structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727458.7U CN217507386U (en) | 2022-03-30 | 2022-03-30 | Lithium ion battery and pole piece structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727458.7U CN217507386U (en) | 2022-03-30 | 2022-03-30 | Lithium ion battery and pole piece structure thereof |
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| Publication Number | Publication Date |
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| CN217507386U true CN217507386U (en) | 2022-09-27 |
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| CN202220727458.7U Active CN217507386U (en) | 2022-03-30 | 2022-03-30 | Lithium ion battery and pole piece structure thereof |
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- 2022-03-30 CN CN202220727458.7U patent/CN217507386U/en active Active
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