CN-122000426-A - Rechargeable battery and battery pack including the same

Abstract

The present application relates to a rechargeable battery and a battery pack including the same. The rechargeable battery includes a case having a sidewall portion including a base layer, and an electrode assembly accommodated in the case. The sidewall portion includes a nanofiber web including cellulose-based nanofibers and a polyolefin-based resin provided on one or both of an outer peripheral surface of the base layer and an inner peripheral surface of the base layer.

Inventors

• SUN YIWU

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241107

Claims (20)

1. 1. A rechargeable battery, comprising: A housing having a side wall portion including a base layer, and An electrode assembly accommodated in the case, Wherein the sidewall portion includes a nanofiber web including cellulose-based nanofibers and a polyolefin-based resin provided on one or both of an outer peripheral surface of the base layer and an inner peripheral surface of the base layer.
2. 2. The rechargeable battery according to claim 1, wherein the polyolefin-based resin is a polypropylene-based resin.
3. 3. The rechargeable battery of claim 1, wherein the nanofiber web is impregnated in the polyolefin-based resin.
4. 4. The rechargeable battery of claim 1, wherein the cellulose-based nanofibers are crystalline cellulose-based nanofibers.
5. 5. The rechargeable battery of claim 1, wherein the cellulose-based nanofiber comprises hydroxyl groups.
6. 6. The rechargeable battery of claim 5, wherein the cellulose-based nanofibers comprise a cellulose-based resin or a cellulose-based resin derivative.
7. 7. The rechargeable battery of claim 5, wherein some of the hydroxyl groups of the cellulose-based nanofibers are modified to be hydrophobic.
8. 8. The rechargeable battery of claim 7, wherein the cellulose-based nanofibers modified to have hydrophobicity are modified using a silane compound.
9. 9. The rechargeable battery of claim 8, wherein the silane compound comprises one or more of a silane coupling agent comprising an epoxy group, a silane coupling agent comprising an amino group, a silane coupling agent comprising a vinyl group, a silane coupling agent comprising a mercapto group, and a silane coupling agent comprising an alkyl group.
10. 10. The rechargeable battery according to claim 1, wherein the cellulose-based nanofibers and the polyolefin-based resin are in the form of a mixture, and Wherein the cellulose-based nanofibers are 70 wt% -90 wt% of the mixture and the polyolefin-based resin is 10 wt% -30 wt% of the mixture, based on 100wt% of the mixture.
11. 11. The rechargeable battery of claim 1, wherein the sidewall portion comprises an outer layer provided on the outer peripheral surface of the base layer, Wherein the outer layer surrounds the outer peripheral surface of the base layer and extends from the open portion of the housing to the bottom portion of the housing, Wherein the outer layer comprises the polyolefin-based resin, and the nanofiber web made of the cellulose-based nanofibers is impregnated in the polyolefin-based resin, and Wherein the nanoweb of the outer layer extends from the open portion of the housing to the bottom portion of the housing.
12. 12. The rechargeable battery of claim 11, wherein the outer layer includes a region that includes only the polyolefin-based resin and is free of the cellulose-based nanofibers.
13. 13. The rechargeable battery of claim 11, wherein a portion of the nanoweb of the outer layer has pores.
14. 14. The rechargeable battery of claim 1, wherein the sidewall portion comprises an inner layer on the inner peripheral surface of the base layer, Wherein the inner layer covers the inner peripheral surface of the base layer and extends from an opening portion of the housing to a bottom portion of the housing; Wherein the inner layer comprises the polyolefin-based resin and the nanofiber web made of the cellulose-based nanofibers impregnated in the polyolefin-based resin, and Wherein the nanoweb of the inner layer extends from the open portion of the housing to the bottom portion of the housing.
15. 15. The rechargeable battery of claim 14, wherein the inner layer includes a region that includes only the polyolefin-based resin and is free of the cellulose-based nanofibers.
16. 16. The rechargeable battery of claim 14, wherein a portion of the nanofiber web of the inner layer has pores.
17. 17. The rechargeable battery of claim 14, wherein a ceramic-containing coating is provided between the base layer and the inner layer.
18. 18. The rechargeable battery of claim 14, wherein the sidewall portion further comprises an outer layer on the outer peripheral surface of the base layer, Wherein the outer layer covers the outer peripheral surface of the base layer and extends from the opening portion of the housing to the bottom portion of the housing, Wherein the outer layer comprises the polyolefin-based resin and the nanofiber web made of the cellulose-based nanofibers impregnated in the polyolefin-based resin, and Wherein the nanoweb extends from the open portion of the housing to the bottom portion of the housing.
19. 19. The rechargeable battery of claim 1, wherein the base layer comprises at least one of steel, stainless steel, aluminum, and aluminum alloy.
20. 20. A battery pack, comprising: A housing, and A plurality of rechargeable batteries disposed within the housing, Wherein each of the plurality of rechargeable batteries is as claimed in any one of claims 1 to 19.

Description

Rechargeable battery and battery pack including the same Cross Reference to Related Applications The present application claims priority and benefit from korean patent application No. 10-2024-0157282 filed in the korean intellectual property office on day 11 and 7 of 2024, the entire disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to rechargeable batteries and battery packs including rechargeable batteries. Background With the rapid spread of electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for rechargeable batteries having high energy density and high capacity has rapidly increased. Accordingly, research and development for improving the performance of rechargeable batteries (e.g., rechargeable lithium batteries) are actively underway. The rechargeable lithium battery includes positive and negative electrodes including active materials allowing intercalation and deintercalation of lithium ions, and an electrolyte. Rechargeable lithium batteries generate electric energy through redox reactions that occur when lithium ions are intercalated into and deintercalated from positive and negative electrodes. The information disclosed in this section is used as a background for the present disclosure and may include information that does not constitute prior art or related art. Disclosure of Invention The present disclosure is directed to a rechargeable battery (hereinafter, may be simply referred to as "battery") and a battery pack including the rechargeable battery. The rechargeable battery has high stability at the time of an external collision, and the rechargeable battery can suppress ignition inside the battery. The rechargeable battery also has excellent moisture and oxygen blocking effects, and can suppress swelling of the battery. The rechargeable battery also has excellent electrolyte impregnation (impregnability). However, the objects of the present disclosure are not limited to the above-mentioned objects, and other non-mentioned objects will be clearly understood by those of ordinary skill in the art from the following description. The rechargeable battery according to the present disclosure includes a case having a sidewall portion including a base layer, and an electrode assembly accommodated in the case, wherein the sidewall portion includes a nanofiber web including cellulose-based nanofibers and a polyolefin-based resin provided on one or both of an outer peripheral surface of the base layer and an inner peripheral surface of the base layer. The battery pack according to the present disclosure includes a case and a plurality of rechargeable batteries disposed within the case, wherein each of the plurality of rechargeable batteries includes a case having a sidewall portion including a base layer, and an electrode assembly accommodated in the case, wherein the sidewall portion includes a nanofiber web including cellulose-based nanofibers and a polyolefin-based resin, and the nanofiber web and the polyolefin-based resin are provided on one or both of an outer peripheral surface of the base layer and an inner peripheral surface of the base layer. According to the present disclosure, since the rechargeable battery includes the case including the cellulose-based nanofibers and the polyolefin-based resin, the stability of the battery at the time of an external collision is high, ignition in the battery can be suppressed, the moisture and oxygen blocking effect is excellent, swelling of the battery can be suppressed, and the electrolyte impregnability is excellent. However, the effects obtainable by the present disclosure are not limited to the above-described effects, and other technical effects not mentioned will be clearly understood by those skilled in the art from the following description. Drawings The accompanying drawings illustrate preferred embodiments of the present disclosure by way of example. The present disclosure is not limited to the embodiments set forth in the drawings. Fig. 1 is a schematic view of a battery pack according to various embodiments of the present disclosure. Fig. 2 is a schematic diagram of a rechargeable battery according to an embodiment of the present disclosure. Fig. 3 is a cross-sectional view of a rechargeable battery according to an embodiment of the present disclosure. Fig. 4 is a sectional view in a thickness direction of a sidewall portion of a case of a rechargeable battery according to an embodiment of the present disclosure. Fig. 5 is a view in the height direction of a side wall portion of a case of a rechargeable battery according to an embodiment of the present disclosure. Fig. 6 is a cross-sectional view of a configuration in a horizontal direction of a case of a rechargeable battery according to an embodiment of the present disclosure. Fig. 7 is a sectional view showing a sectional configuration in a thickness direction of a side wall portion of a case of