BATTERY SAFETY CARD

• US 20190319466A1
• Filed: 04/12/2018
• Published: 10/17/2019
• Est. Priority Date: 04/12/2018
• Status: Active Grant

• Current Assignee: Dish Network Technologies India Private Limited
• Original Assignee: Sling Media Pvt Ltd. (Dish Network Corporation)
• Inventors: PK, Arun
• Granted Patent: US 10,978,893 B2
• Time in Patent Office: Days
• CPC Class Codes: G01K 13/00 Thermometers specially adapted for specific purposes
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• 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 10/443 in response to temperature
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2010/4278 Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
• CPC Class Codes: H01M 2200/10 Temperature sensitive devices
• CPC Class Codes: H02H 5/04 responsive to abnormal temperature specially adapted for electric machines H02H7/0852
• CPC Class Codes: H02H 7/18 for batteries; for accumulators
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A system and method to disconnect a battery from a load circuit when the battery temperature is outside a selected high threshold or a low threshold. A plurality of temperature sensors are provided for sensing a high battery temperature and a low battery temperature. If the either the high temperature sensor or the low temperature sensor outputs an error signal, the battery is disconnected from the load circuits. The disconnection from the load circuits is carried out by disabling at least four different circuits, any one of which alone will disconnect the battery from the load circuits. These four circuits include a battery switch circuit, a power control circuit, a charge control logic circuit and a voltage regulator circuit. The plurality of temperature sensors provides a backup system in the event any one of the temperature sensors is defective.

Claims

1. A system, comprising:

a battery;

a load circuit that receives power from the battery for its operation;

a plurality of temperature pads thermally coupled to the battery to reach a temperature corresponding to that of the battery;

a first high temperature sensor coupled to the plurality of temperature sensor pads, the first high temperature sensor outputting a signal indicating that the battery temperature is above a selected high temperature threshold;

a first low temperature sensor coupled to the plurality of temperature sensor pads, the first low temperature sensor outputting a signal indicating that the battery temperature is below a selected low temperature threshold;

a first OR logic circuit that receives as inputs the output from the first high and low temperature sensors and outputs a first error signal if either the first high or low temperature and second outputs a signal indicating the temperature is outside the selected threshold for the respective first temperature sensors;

a second high temperature sensor coupled to the plurality of temperature sensor pads, the second high temperature sensor outputting a signal indicating that the battery temperature is above the selected high temperature threshold;

a second low temperature sensor coupled to the plurality of temperature sensor pads, the second low temperature sensor outputting a signal indicating that the battery temperature is below the selected low temperature threshold;

a second OR logic circuit that receives as inputs the output from the first high and low temperature sensors and outputs a second error signal if either the first high or low temperature sensors outputs a signal indicating the temperature is outside the selected threshold for the respective second temperature sensors;

a third OR logic circuit that receives as inputs the output from the first OR logic and the second OR logic and outputs a third error signal if either the first or second inputs are error signals; and

a shutdown circuit coupled to the output of the third OR logic circuit that terminates the delivery of all power to the load circuit from all sources and terminates all power to and from the battery when the third error signal is received.

2. The system of claim 1 in which the shutdown circuit comprises:

a battery supply switch circuit having the third error signal as an input to the battery supply switch and the battery supply switch disconnects the power provided from the battery to the load circuit upon occurrence of the third error signal.

3. The system of claim 2 wherein the battery supply switch also disconnects the power provided from a charging source to the battery upon occurrence of the third error signal.

4. The system of claim 1 wherein the shutdown circuit includes an input power supply disconnection switch circuit having the third error signal as an input to that disconnects the power provided from the battery from power supply to terminate all charging of the battery upon occurrence of the third error signal.

5. The system of claim 1 wherein the shutdown circuit includes voltage regulators having the third error signal as an input to the voltage regulators, and the voltage regulators are disabled upon occurrence of the third error signal.

6. The system of claim 1 wherein the shutdown circuit includes a battery charge logic circuit having the third error signal as an input and the battery charge logic circuit disables all charging of the battery upon occurrence of the third error signal.

7. The system of claim 2 wherein the shutdown circuit includes a power control integrated circuit that receives as an input a disable signal from each of the battery supply switch circuit, input power supply disconnection switch circuit and a battery charge logic circuit, any one of which will cause the power control integrated circuit to disconnect the battery from the load circuits and the battery charge circuits.

8. The system of claim 7, further including:

a thermistor that is thermally coupled to the battery that outputs a signal indicative of the temperature of the battery;

an output line from the thermistor to the power control integrated circuit; and

a disable circuit in the power control integrated circuit that disconnects all power to or from the battery if the signal from the thermistor indicates a temperature of the battery higher than a first threshold temperature.

9. The system according to claim 1 wherein the plurality of temperature pads thermally coupled to the battery include at least six different temperature pads all spaced from each other and each thermally coupled to a common temperature based material.

10. The system of claim 1 wherein the common temperature based material is a thermal spreader connected between the battery and the temperature pads.

11. The system of claim 1 wherein a printed circuit board contains the plurality of temperature pads thermally coupled to the battery to reach a temperature corresponding to that of the battery on a first side thereof and has, a second side thereof each of the first high temperature sensor coupled to the plurality of temperature sensor pads, the first low temperature sensor coupled to the plurality of temperature sensor pads, the first OR logic circuit that receives as inputs the output from the first high and low temperature sensors, the second high temperature sensor coupled to the plurality of temperature sensor pads, the second low temperature sensor coupled to the plurality of temperature sensor pads, the second OR logic circuit that receives as inputs the output from the first high and low temperature sensors and the third OR logic circuit that receives as inputs the output from the first OR logic and the second OR logic and outputs a third error signal if either the first or second and second inputs are error signals.

12. A system, comprising:

a battery;

a load circuit that receives power from the battery for its operation;

a first temperature sensor constructed by a first technique coupled to the battery at a first location, the first temperature sensor outputting a first temperature error signal when the temperature of the battery is outside a first target temperature range;

a plurality of temperature pads thermally coupled to the battery to reach a temperature corresponding to that of the battery;

a second temperature sensor constructed by a second technique coupled to the plurality of temperature pads, the second temperature sensor outputting a second temperature error signal when the temperature of the battery is outside a second target temperature range; and

a power control integrated circuit that is coupled to receive an input from the first temperature sensor constructed by a first technique and from the second temperature sensor constructed by a second technique to terminate all power to the load circuit from all sources and terminate all power to and from the battery when either the first temperature sensor or the second temperature sensor outputs a temperature error signal.

13. The system of claim 12 wherein the plurality of temperature pads thermally coupled to the battery a connected on a first side of a printed circuit board.

14. The system of claim 13 wherein first temperature sensor is a thermistor connected to the battery and the second temperature sensor is connected to a second side of the printed circuit board.

15. A method of disconnecting a battery from a load circuit, comprising:

sensing a temperature of a battery with a first high temperature sensor;

outputting a first temperature error signal when the battery temperature is above a selected high temperature threshold;

sensing a temperature of a battery with a first low temperature sensor;

outputting a second temperature error signal when the battery temperature is below a selected low temperature threshold;

sensing a temperature of a battery with a second high temperature sensor;

outputting a third temperature error signal when the battery temperature is above the selected high temperature threshold;

sensing a temperature of a battery with a second low temperature sensor;

outputting a fourth temperature error signal when the battery temperature is below the selected low temperature threshold; and

disconnecting a battery from a load circuit and from a charging circuit when any one of the first, second, third or fourth temperature error signals are output.

16. The method of claim 15 wherein the step of disconnecting the battery from the load circuit and from the charging circuit comprises:

disabling a battery supply switch circuit, an input power supply disconnection switch circuit, a battery charge logic circuit and voltage regulators.

17. The method of claim 16, further including:

disabling a power control integrated circuit when any one of the battery supply switch circuit, input power supply disconnection switch circuit, or battery charge logic circuit is disabled.

18. The method of claim 16 in which the step disabling the battery supply switch circuit, an input power supply disconnection switch circuit, a battery charge logic circuit and voltage regulators occurs simultaneously.

19. The method of claim 16 in which the steps of disabling the battery supply switch circuit, an input power supply disconnection switch circuit, a battery charge logic circuit, and voltage regulators occur sequentially, with the voltage regulators being disabled before the battery supply switch is disabled.

20. The method of claim 19 wherein the step of disabling the battery charge logic occurs prior to disabling the battery supply switch.