Battery protection circuit module and battery pack comprising same

• US 10,840,564 B2
• Filed: 08/11/2016
• Issued: 11/17/2020
• Est. Priority Date: 08/20/2015
• Status: Active Grant

• Current Assignee: ITM Semiconductor Co., Ltd.
• Original Assignee: ITM Semiconductor Co., Ltd.
• Inventors: Na, Hyuk Hwi, Hwang, Ho Seok, Kim, Young Seok, Ahn, Sang Hoon
• Primary Examiner(s): Robbins, Jerry D
• Application Number:
  US15/749,670
• Publication Number:
  US 20180233785A1
• Time in Patent Office: 1,559 Days
• Field of Search: 320134
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H02H 7/18 for batteries; for accumulators
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

According to an aspect of the present invention, there is provided a battery protection circuit module including a first positive terminal and a first negative terminal electrically connected to electrode terminals of a battery bare cell, a second positive terminal and a second negative terminal electrically connected to a charger or an electronic device, a first protection circuit unit including a first single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a first protection integrated circuit (P-IC) for controlling the first single field-effect transistor, and a second protection circuit unit including a second single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a second P-IC for controlling the second single field-effect transistor.

Claims

1. A battery protection circuit module comprising:

a first positive terminal and a first negative terminal electrically connected to electrode terminals of a battery bare cell;

a second positive terminal and a second negative terminal electrically connected to a charger or an electronic device;

a first protection circuit unit comprising a first single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a first protection integrated circuit for controlling the first single field-effect transistor; and

a second protection circuit unit comprising a second single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a second protection integrated circuit for controlling the second single field-effect transistor,

wherein the first protection integrated circuit controls the first single field-effect transistor by detecting overcharge, overdischarge, and/or overcurrent of the battery bare cell,

wherein the second protection integrated circuit controls the second single field-effect transistor by detecting overcharge, overdischarge, and/or overcurrent of the battery bare cell, and

wherein the first protection circuit unit and the second protection circuit unit provide a dual protection circuit configuration for the battery bare cell.

2. The battery protection circuit module of claim 1, wherein at least one of the second protection circuit unit and the first protection circuit unit operates for overcurrent protection to replace a positive temperature coefficient (PTC) thermistor.

3. The battery protection circuit module of claim 1, wherein the first single field-effect transistor and/or the second single field-effect transistor comprises a drain terminal, a source terminal, a gate terminal, and a well terminal,

wherein the first protection circuit unit and the second protection circuit unit controls charging/discharging of the battery bare cell by controlling the gate terminal electrically connected to the first protection integrated circuit and the second protection integrated circuit respectively controlling whether to switch on the first single field-effect transistor and the second single field-effect transistor, and controlling a bias voltage of the well terminal by using an internal switch,

wherein the first protection integrated circuit and the second protection integrated circuit comprise a reference terminal, a detection terminal, and a bias terminal connected to the well terminal, respectively,

wherein the bias terminal is always connected to one of the reference terminal and the detection terminal, and

wherein the internal switch is connected between the bias terminal and the other of the reference terminal and the detection terminal, which is not always connected to the bias terminal.

4. The battery protection circuit module of claim 3, wherein the first protection integrated circuit and the second protection integrated circuit comprise a diode connected between the bias terminal and the one of the reference terminal and the detection terminal, which is connected to the bias terminal, to have a forward direction corresponding to a direction toward the bias terminal respectively.

5. The battery protection circuit module of claim 4, wherein the bias terminal is always connected via the diode to the reference terminal, and

wherein the internal switch is interposed between the bias terminal and the detection terminal.

6. The battery protection circuit module of claim 5, wherein the internal switch is turned on when overcharge is detected.

7. The battery protection circuit module of claim 4, wherein the bias terminal is always connected via the diode to the detection terminal, and

wherein the internal switch is interposed between the bias terminal and the reference terminal.

8. The battery protection circuit module of claim 7, wherein the internal switch is turned off when overdischarge is detected.

9. The battery protection circuit module of claim 1, wherein the first protection circuit unit and/or the second protection circuit unit further comprises at least one passive element connected to the first protection integrated circuit and the second protection integrated circuit, respectively.

10. The battery protection circuit module of claim 1, wherein the first protection circuit unit and second protection circuit units have equal configurations of elements.

11. The battery protection circuit module of claim 1, wherein the first single field-effect transistor and/or the second single field-effect transistor comprises a drain terminal, a source terminal, a gate terminal, and a well terminal,

wherein the first protection integrated circuit and the second protection integrated circuit P-IC controls charging/discharging of the battery bare cell by controlling the gate terminal electrically connected to the first protection circuit unit and the second protection circuit unit, controlling whether to switch on the single field-effect transistor, and controlling a bias voltage of the well terminal by using an internal switch,

wherein the first protection integrated circuit and the second protection integrated circuit comprises a reference terminal connected between the first negative terminal and the drain terminal, a detection terminal connected between the second negative terminal and the source terminal, and a bias terminal connected to the well terminal, and

wherein the bias terminal is connectable via the internal switch to the detection terminal.

12. The battery protection circuit module of claim 11, wherein the bias terminal is connected to the detection terminal when the internal switch is turned on, and is floated when the internal switch is turned off.

13. A battery protection circuit package comprising:

a substrate; and

the battery protection circuit module of claim 1 mounted on the substrate.

14. A battery pack comprising:

a battery bare cell; and

the battery protection circuit package of claim 13 connected to the battery bare cell.

15. A battery protection circuit module comprising:

a first positive terminal and a first negative terminal electrically connected to electrode terminals of a battery bare cell;

a second positive terminal and a second negative terminal electrically connected to a charger or an electronic device;

a first protection circuit unit comprising a transistor group comprising two field-effect transistors connected in series to each other between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a first protection integrated circuit for controlling the transistor group; and

a second protection circuit unit comprising a second single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a second protection integrated circuit for controlling the second single field-effect transistor,

wherein the first protection integrated circuit controls the two field-effect transistors by detecting overcharge, overdischarge, and/or overcurrent of the battery bare cell,

wherein the second protection integrated circuit controls the second single field-effect transistor by detecting overcharge, overdischarge, and/or overcurrent of the battery bare cell, and

wherein the first protection circuit unit and the second protection circuit unit provide a dual protection circuit configuration for the battery bare cell.