# US 11,444,314 B2 · High-energy-density secondary lithium-ion battery

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- Number: US 11,444,314 B2
- Document ID: US11444314B2
- Status: Granted
- Kind: B2
- Application number: 16/742,474
- Filed: 2020-01-14
- Published: 2021-01-14
- Granted: 2022-09-13
- Earliest claimed: 2019-07-10
- Assignees: National Engineering Research Center of Advanced Energy Storage Materials (Shenzhen) Co., Ltd.
- Applicants: National Engineering Research Center of Advanced Energy Storage Materials (Shenzhen) Co., Ltd
- Inventors: Hongbing Liu; Faping Zhong; Xiaofeng Chen; Pengfei Chen; Yinglin Gong; Shunhua Hu
- Web page: https://patentgrep.com/patent/US11444314B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries}
- H01M 10/4264: {with capacitors}
- H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence)
- H01M 50/224: Metals
- H01M 50/276: Inorganic material
- H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543)
- H02J 7/50: acting upon multiple batteries simultaneously or sequentially
- H02J 7/60: including safety or protection arrangements
- H02J 7/70: characterised by the mechanical construction
- H02J 7/855: {with circuits adapted for supplying loads from the battery}
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- H02J 2207/30: Charge provided using DC bus or data bus of a computer
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

The present invention provides a high-energy-density secondary lithium-ion battery, including: a lithium-ion cell, a steel shell, a protection IC, an integrated IC, resistors, capacitors, an inductor, a MicroUSB interface, a plastic structural part, a square rigid FR-4 substrate, a circular rigid FR-4 substrate and a metal cap, for integrating three functions of a constant voltage output, charge management and protection, overcharge and overdischarge protection, and overcurrent protection. Compared with the prior art, the large-capacity secondary battery of the present invention can achieve multi-functional integration of the battery, and also can save the space occupied by accessory structural parts of the battery and achieve a high energy density of the battery, and is also conducive to improving the reliability.

## Claims

### Claim 1

A high-energy-density secondary lithium-ion battery, comprising: a lithium-ion cell, a steel shell, a protection IC, an integrated IC, resistors, capacitors, an inductor, a MicroUSB interface, a plastic structural part, a square rigid FR-4 substrate, a circular rigid FR-4 substrate and a metal cap, for integrating three functions of a constant voltage output, charge management and protection, overcharge and overdischarge protection, overcurrent protection and in a form of three-dimensional space layout and assembly, greatly reducing the space occupied by structural parts that do not contribute to the capacity, to achieve a high energy density, wherein the MicroUSB interface is welded to a side A of the square rigid FR-4 substrate; the protection IC, the integrated IC, the resistors, the capacitors, the inductor and the metal cap are welded to the circular rigid FR-4 substrate; a side B of the square rigid FR-4 substrate is perpendicularly assembled with the circular rigid FR-4 substrate, an opening of the MicroUSB interface being oriented the same as a side A of the circular rigid FR-4 substrate, and pads on the side B of the square rigid FR-4 are soldered and fixed to pads on a side B of the circular rigid FR-4 substrate; the lithium-ion cell is placed inside the steel shell; the metal cap is clamped in the plastic structural part and partially exposed from an end face of a first tensile body of the plastic structural part; the square rigid FR-4 substrate and the circular rigid FR-4 substrate assembled together are clamped on the plastic structural part in a mating manner with the opening of the MicroUSB interface facing upward; the plastic structural part is sleeved at an open end of the steel shell in a mating manner; and a positive terminal and a negative terminal of the lithium-ion cell are connected to a first pad and a second pad on the side B of the circular rigid FR-4 substrate through a positive electrode lead wire and a negative electrode lead wire respectively;
the metal cap satisfies: SJ1+Yjmax ≤H2, SJ1+SJ2−0.8 mm≤H2≤SJ1+SJ2−0.2 mm, YH+0.2 mm≤H3≤YH+2 mm, and YH+SJ1+SJ2≤H3+H2≤YH+SJ1+SJ2+2 mm, wherein SJ1 is the height of the first tensile body of the plastic structural part, YJmax is the height of a highest component on the side A of the circular rigid FR-4 substrate, that is, the side directly facing a first cylindrical body of the metal cap, SJ2 is the height of a second tensile body of the plastic structural part, H2 is the height of a second cylindrical body of the metal cap, H3 is the height of a third cylindrical body of the metal cap, and YH is the thickness of the circular rigid FR-4 substrate, all in mm;
the plastic structural part satisfies: M2<SHD<M1, and YJmax<SJ2<YJmax+1 mm, wherein M1 is the diameter of the first cylindrical body of the metal cap, M2 is the diameter of the second cylindrical body of the metal cap, SHD is the diameter of a central hole of the plastic structural part, SJ2 is the height of the second tensile body of the plastic structural part, and YJmax is the height of the highest component on the side A of the circular rigid FR-4 substrate, that is, the side directly facing the first cylindrical body of the metal cap, all in mm;
the square rigid FR-4 substrate satisfies: SJ1≤FH1, UH−UD−FCG≤FH1+FH2≤UH−UD−FCG+1 mm, and YPmax≤FH2, wherein SJ1 is the height of the first tensile body of the plastic structural part, FH1 is the height of a first square flat plate tensile body of the square rigid FR-4 substrate, FH2 is the height of a second square flat plate tensile body of the square rigid FR-4 substrate, UH is the length of the MicroUSB interface, UD is the distance from the plane of an outermost end of an opening portion of the MicroUSB interface to the plane of a nearest edge of the first square flat plate tensile body of the square rigid FR-4 substrate, FCG is the height of a square slot of the square rigid FR-4 substrate, and YPmax is the height of the highest component on the side B of the circular rigid FR-4 substrate, all in mm;
the circular rigid FR-4 substrate satisfies:
(
SD
⁢
⁢
2
2
-
SDB
)
-
(
SD
⁢
⁢
2
2
-
SDB
)
2
-
(
UA
2
)
2
+
UF
-
FHD
≤
YQS
≤
YB
-
M
⁢
⁢
1
⁢
/
⁢
2
+
FHD
-
0.2
⁢
⁢
mm
,
and
⁢
⁢
YQS
=
YB
-
RA
,
wherein YQS is the depth of a notch of a square flat plate tensile body of the circular rigid FR-4 substrate, UF is the thickness of the MicroUSB interface, SD2 is the outer diameter of the second tensile body of the plastic structural part, SDB is the wall thickness of the second tensile body of the plastic structural part, UA is the width of the MicroUSB interface, YB is the radius of the circular rigid FR-4 substrate, RA is the closest distance from the circle center of the circular rigid FR-4 substrate to the square flat plate tensile body notch of the circular rigid FR-4 substrate, FHD is the thickness of the square rigid FR-4 substrate, and M1 is the diameter of the first cylindrical body of the metal cap, all in mm; and
the maximum height DXGmax of the lithium-ion cell satisfies: DXGmax≤H−H1−SJ1−SJ2−YH−FH2−GKDH, wherein H is the total height of the secondary lithium-ion battery, H1 is the height of the first cylindrical body of the metal cap, SJ1 is the height of the first tensile body of the plastic structural part, SJ2 is the height of the second tensile body of the plastic structural part, YH is the thickness of the circular rigid FR-4 substrate, FH2 is the height of the second square flat plate tensile body of the square rigid FR-4 substrate, and GKDH is the thickness of the bottom of the steel shell including a convex plate at the bottom, all in mm.

### Claim 2 (depends on 1)

The high-energy-density secondary lithium-ion battery of claim 1, wherein the metal cap satisfies M2<M1<SD1, 0.5 mm≤M2≤3 mm, M3<M2, and 0.1 mm≤M3≤1 mm, wherein M1 is the diameter of the first cylindrical body of the metal cap, M2 is the diameter of the second cylindrical body of the metal cap, M3 is the diameter of the third cylindrical body of the metal cap, and SD1 is the diameter of the first tensile body of the plastic structural part.

### Claim 3 (depends on 1)

The high-energy-density secondary lithium-ion battery of claim 1, wherein the plastic structural part satisfies: SD1=GW, 0.5 mm≤SJ1≤1 mm, GN−0.5 mm≤SD2≤GN, and 0.5 mm≤SDB≤1 mm, wherein SD1 is the diameter of the first tensile body of the plastic structural part, GW is the outer diameter of the steel shell, SJ1 is the height of the first tensile body of the plastic structural part, SD2 is the outer diameter of the second tensile body of the plastic structural part, GN is the inner diameter of the steel shell, and SDB is the wall thickness of the second tensile body of the plastic structural part, all in mm.

### Claim 4 (depends on 1)

The high-energy-density secondary lithium-ion battery of claim 1, wherein the square rigid FR-4 substrate satisfies: YH<FCG≤YH+0.2 mm, 0.5 mm≤FCKD≤2 mm, UA+2 mm≤FK1≤UA+5 mm, FK1<FK2, 2×√{square root over (YB2−RA2)}−2 mm≤FK2≤2×√{square root over (YB2−RA2)}, and SJ1−0.1 mm≤UD≤SJ1, wherein YH is the thickness of the circular rigid FR-4 substrate, FCG is the height of the square slot of the square rigid FR-4 substrate, FCKD is the width of the square slot of the square rigid FR-4 substrate, UA is the width of the MicroUSB interface, FK1 is the width of the first square flat plate tensile body of the square rigid FR-4 substrate, FK2 is the width of the second square flat plate tensile body of the square rigid FR-4 substrate, YB is the radius of the circular rigid FR-4 substrate, RA is the closest distance from the circle center of the circular rigid FR-4 substrate to the square flat plate tensile body notch of the circular rigid FR-4 substrate, SJ1 is the height of the first tensile body of the plastic structural part, and UD is the distance from the plane of the outermost end of the opening portion of the MicroUSB interface to the plane of the nearest edge of the first square flat plate tensile body of the square rigid FR-4 substrate, all in mm.

### Claim 5 (depends on 1)

The high-energy-density secondary lithium-ion battery of claim 1, wherein the circular rigid FR-4 substrate satisfies: M3≤d1≤M3+0.3 mm, SD2−SDB×2<2×YB<SD2, and FK1−2×FCKD≤YQK≤FK1−1.0 mm, wherein YB is the radius of the circular rigid FR-4 substrate, d1 is the diameter of the center hole of the circular rigid FR-4 substrate, M3 is the diameter of the third cylindrical body of the metal cap, SD2 is the outer diameter of the second tensile body of the plastic structural part, SDB is the wall thickness of the second tensile body of the plastic structural part, YQK is the width of the square flat plate tensile body notch of the circular rigid FR-4 substrate, FK1 is the width of the first square flat plate tensile body of the square rigid FR-4 substrate, and FCKD is the width of the square slot of the square rigid FR-4 substrate, all in mm.

### Claim 6 (depends on 2)

The high-energy-density secondary lithium-ion battery of claim 2, wherein the metal cap comprises the first cylindrical body, the second cylindrical body and the third cylindrical body, an upper end face of the first cylindrical body being chamfered, the first cylindrical body being a structural part for the secondary lithium-ion battery to contact an external load or charging power source, the third cylindrical body, the second cylindrical body and the first cylindrical body being coaxial, a top surface of the second cylindrical body being coplanar with a bottom surface of the first cylindrical body, and a top surface of the third cylindrical body being coplanar with a bottom surface of the second cylindrical body.

### Claim 7 (depends on 3)

The high-energy-density secondary lithium-ion battery of claim 3, wherein the plastic structural part comprises the first tensile body and the second tensile body, the first tensile body being a cylindrical structure, the first tensile body being provided with the center hole and a MicroUSB opening portion, the second tensile body being a cylindrical structure, one end of the second tensile body being perpendicularly fixed to the bottom of the first tensile body, and the second tensile body being coaxial with the first tensile body.

### Claim 8 (depends on 4)

The high-energy-density secondary lithium-ion battery of claim 4, wherein the square rigid FR-4 substrate comprises the first square flat plate tensile body and the second square flat plate tensile body, the first square flat plate tensile body being combined with the second square flat plate tensile body into a whole, and two hollowed square slots symmetrical about a central axis being formed at a joint part of the first square flat plate tensile body and the second square flat plate tensile body.

### Claim 9 (depends on 1)

The high-energy-density secondary lithium-ion battery of claim 1, wherein the overall contour of the circular rigid FR-4 substrate is a circular tensile body, and the circular rigid FR-4 substrate is provided with a square flat plate tensile body notch and a center hole.