Battery cell assembly

• US 10,062,930 B2
• Filed: 08/20/2015
• Issued: 08/28/2018
• Est. Priority Date: 08/20/2015
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Bober, Greg
• Primary Examiner(s): Luebke, R S
• Assistant Examiner(s): Baillargeon, Paul
• Application Number:
  US14/831,120
• Publication Number:
  US 20170054185A1
• Time in Patent Office: 1,104 Days
• CPC Class Codes: G01R 31/36 Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
• 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 10/48 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 10/486 for measuring temperature
• CPC Class Codes: H01M 50/211 adapted for pouch cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery cell assembly includes a thin sensor assembly having a plastic sheet, first, second, third, and fourth conductive pads, first and second resistive traces, a sensing circuit, a microprocessor, and an electrical connector. The plastic sheet has a first side and a second side. The plastic sheet further having first and second sheet portions, a first connecting portion, and first, second, and third tabs. The first connecting portion is coupled to and between the first and second sheet portions. The first and second resistive traces are disposed directly on and coupled to the first and second sheet portions, respectively. The first and second conductive pads are disposed directly on and coupled to the first and second tabs, respectively, on the first side.

Claims

1. A battery cell assembly, comprising:

a sensor assembly having a plastic sheet, first and second conductive pads, a first resistive trace, a sensing circuit, a microprocessor, and an electrical connector;

the plastic sheet having first and second sides, first and second sheet portions, a first connecting portion coupled between the first and second sheet portions, and first and second tabs;

the first connecting portion being coupled between the first and second sheet portions;

the first resistive trace being coupled to the first sheet portion;

the first and second conductive pads being coupled to the first and second tabs, respectively, on the first side;

the microprocessor being coupled to at least one of the first and second sheet portions, and being electrically coupled to the sensing circuit and the electrical connector;

the sensing circuit being coupled to at least one of the first and second sheet portions, and being electrically coupled to the first resistive trace;

a first battery cell having a first housing and first and second electrical terminals extending from the first housing;

the first housing being disposed directly on the first sheet portion on the first side;

the first electrical terminal of the first battery cell being coupled to the first conductive pad;

the second electrical terminal of the first battery cell being coupled to the second conductive pad.

2. The battery cell assembly of claim 1, wherein:

the sensing circuit generating a first voltage that is indicative of a first temperature level of the first battery cell, based on a resistance of the first resistive trace;

the microprocessor determining the first temperature level of the first battery cell based on the first voltage; and

the microprocessor sending a first binary message having a first temperature value therein corresponding to the first temperature level of the first battery cell to the electrical connector.

3. The battery cell assembly of claim 1, wherein:

the sensing circuit being electrically coupled to the first and second conductive pads;

the microprocessor determining a first voltage value indicating an output voltage of the first battery cell based on a voltage received from the second conductive pad; and

the microprocessor sending a first binary message having the first voltage value therein to the electrical connector.

4. The battery cell assembly of claim 1, wherein the first resistive trace has a thickness in a range of 0.33-1.0 millimeters.

5. The battery cell assembly of claim 4, wherein the first resistive trace is constructed of at least one of graphite, nickel, tin, silver, copper, or an alloy of at least two of the foregoing materials.

6. The battery cell assembly of claim 1, wherein the microprocessor is electrically coupled to the first and second electrical terminals of the first battery cell, the first and second electrical terminals of the first battery cell configured to supply an operational voltage to the microprocessor.

7. The battery cell assembly of claim 1, wherein the sensor assembly further includes a circuit board coupled to at least one of the first and second sheet portions, the microprocessor being coupled directly to the circuit board.

8. The battery cell assembly of claim 1, wherein:

the sensor assembly includes third and fourth conductive pads and a second resistive trace;

the second resistive trace being coupled to the second sheet portion;

the plastic sheet having a third tab;

the third conductive pad being coupled to the second tab on the second side, the third conductive pad being electrically coupled to the second conductive pad;

the fourth conductive pad being coupled to the third tab on the second side;

the sensing circuit being electrically coupled to the second resistive trace; and

a second battery cell having a second housing and first and second electrical terminals extending from the second housing;

the second housing being disposed directly on the second sheet portion on the second side;

the first electrical terminal of the second battery cell being coupled to the third conductive pad;

the second electrical terminal of the second battery cell being coupled to the fourth conductive pad.

9. The battery cell assembly of claim 8, wherein the first connecting portion is bendable such that the first sheet portion is disposed between and directly contacts the first and second housings, respectively, of the first and second battery cells, respectively.

10. The battery cell assembly of claim 8, wherein:

the sensor assembly having fifth, sixth, seventh, and eighth conductive pads, and third and fourth resistive traces;

the plastic sheet further having third and fourth sheet portions, second and third connecting portions, and fourth and fifth tabs;

the second connecting portion being coupled between the second and third sheet portions;

the third connecting portion being coupled between the third and fourth sheet portions;

the sensing circuit being electrically coupled to the third and fourth resistive traces;

a third battery cell having a first housing and first and second electrical terminals extending from the third housing;

the third housing being disposed directly on the third sheet portion on the first side;

the first electrical terminal of the third battery cell being coupled to the fifth conductive pad;

the second electrical terminal of the third battery cell being coupled to the sixth conductive pad; and

a fourth battery cell having a fourth housing and first and second electrical terminals extending from the fourth housing;

the fourth housing being disposed directly on the fourth sheet portion on the second side;

the first electrical terminal of the fourth battery cell being coupled to the seventh conductive pad;

the second electrical terminal of the fourth battery cell being coupled to the eighth conductive pad.

11. The battery cell assembly of claim 10, wherein:

the second battery cell being sandwiched between and directly contacting the first and second sheet portions on the second side;

the third battery cell being sandwiched between and directly contacting the second and third sheet portions on the first side; and

the fourth battery cell being sandwiched between and directly contacting the third and fourth sheet portions on the second side.

12. The battery cell assembly of claim 10, wherein:

the third and fourth resistive traces being coupled to the third and fourth sheet portions, respectively;

the fifth conductive pad being coupled to the third tab on the first side, the fifth conductive pad being electrically coupled to the fourth conductive pad;

the sixth and seventh conductive pads being coupled to the fourth tab on the first and second sides, respectively;

the sixth conductive pad being electrically coupled to the seventh conductive pad; and

the eighth conductive pad being coupled to the fifth tab on the second side.