CN-121995096-A - Voltage measuring device

Abstract

A voltage measurement device may include a bus bar electrically connected to first and second terminals of a battery cell, with the bus bar extending in a first direction. The shunt resistor may be located on the bus bar and extend in a second direction intersecting the first direction. The measuring unit is configured to measure a first voltage value applied to a first sub-region of the shunt resistor and to measure a second voltage value applied to a second sub-region of the shunt resistor.

Inventors

• Liu Zhungao
• ZHENG XIANZHE
• YIN SHIBIN

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251106

Priority Date

20241106

Claims (20)

1. 1. A voltage measurement device, comprising: a bus bar electrically connected to the first and second terminals of the battery cell, the bus bar extending in a first direction; A shunt resistor located on the bus bar and extending in a second direction intersecting the first direction, and A measuring device configured to measure a first voltage value applied to a first sub-region of the shunt resistor and a second voltage value applied to a second sub-region of the shunt resistor.
2. 2. The voltage measurement device of claim 1, further comprising: A first sensor and a second sensor located at opposite ends of the first sub-region, each of the first sensor and the second sensor having a measurement terminal disposed thereon for measuring a voltage by the measurement device, and A third sensor and a fourth sensor located at opposite ends of the second sub-region, each of the third sensor and the fourth sensor having measurement terminals disposed thereon for measuring a voltage by the measurement device.
3. 3. The voltage measurement device according to claim 2, wherein the measurement device further measures a third voltage value applied between the first sensor and the fourth sensor, and measures a fourth voltage value applied between the third sensor and the second sensor.
4. 4. The voltage measurement device of claim 2 wherein the first and third sensors are adjacent to a first side of the shunt resistor, and Wherein the second sensor and the fourth sensor are adjacent to a second side of the shunt resistor opposite the first side of the shunt resistor.
5. 5. The voltage measurement device of claim 2 wherein the first sensor is symmetrical to the second sensor about a centerline of the shunt resistor, and Wherein the third sensor is symmetrical to the fourth sensor about the centerline of the shunt resistor.
6. 6. The voltage measurement device of claim 2, wherein the first sensor has a different size than the second sensor, and Wherein the size of the third sensor is different from the size of the fourth sensor.
7. 7. The voltage measurement device of claim 2, further comprising: a first fastener and a second fastener for fixing the bus bar, Wherein a distance from the shunt resistor in the first direction to each of the first and second fasteners is longer than a distance from the shunt resistor in the first direction to each of the first and second sensors.
8. 8. The voltage measurement device of claim 7, wherein the first fastener is electrically connected to the first terminal and the second fastener is electrically connected to the second terminal.
9. 9. The voltage measurement device of claim 5, further comprising: a first fastener, a second fastener, a third fastener, and a fourth fastener, securing the bus bar, Wherein the first fastener and the second fastener are electrically connected to the first terminal, Wherein a distance from the shunt resistor in the first direction to each of the first and second fasteners is longer than a distance from the shunt resistor in the first direction to each of the first and third sensors, Wherein the third fastener and the fourth fastener are electrically connected to the second terminal, and Wherein a distance from the shunt resistor in the first direction to each of the third fastener and the fourth fastener is longer than a distance from the shunt resistor in the first direction to each of the second sensor and the fourth sensor.
10. 10. The voltage measurement device of claim 9, wherein the first fastener, the first sensor, the second sensor, and the third fastener are positioned along a first line in the first direction, and Wherein the second fastener, the third sensor, the fourth sensor, and the fourth fastener are disposed along a second straight line in the first direction.
11. 11. The voltage measurement device of claim 1, wherein the shunt resistance crosses opposite sides of the bus bar in the second direction.
12. 12. The voltage measurement device according to any one of claims 1 to 11, further comprising: A control unit configured to output a warning associated with the shunt resistance by comparing a ratio of the first voltage value to the second voltage value to a threshold value.
13. 13. The voltage measurement device according to any one of claims 1 to 11, further comprising: A control unit configured to calculate a first current value of the first sub-region based on the first voltage value, calculate a second current value of the second sub-region based on the second voltage value, and output a warning associated with the shunt resistor by comparing the first current value with the second current value.
14. 14. A voltage measurement device, comprising: a bus bar electrically connected to the first and second terminals of the battery cell, the bus bar extending in a first direction; a shunt resistor located on the bus bar and extending in a second direction intersecting the first direction; A measuring device configured to measure a first voltage value applied to a first sub-region of the shunt resistor and a second voltage value applied to a second sub-region of the shunt resistor, and A boundary portion in the form of a hole formed through the bus bar, the boundary portion separating the first sub-region and the second sub-region.
15. 15. The voltage measurement device of claim 14, further comprising: A first sensor and a second sensor located at opposite ends of the first sub-region, each of the first sensor and the second sensor having a measurement terminal disposed thereon for measuring a voltage by the measurement device, and A third sensor and a fourth sensor located at opposite ends of the second sub-region, each of the third sensor and the fourth sensor having measurement terminals disposed thereon for measuring a voltage by the measurement device.
16. 16. The voltage measurement device of claim 15, wherein the measurement device is configured to further measure a third voltage value applied between the first sensor and the fourth sensor and a fourth voltage value applied between the third sensor and the second sensor.
17. 17. The voltage measurement device of claim 15 wherein the first and third sensors are adjacent to a first side of the shunt resistor, and Wherein the second sensor and the fourth sensor are adjacent to a second side of the shunt resistor opposite the first side of the shunt resistor.
18. 18. The voltage measurement device of claim 17 wherein the first sensor has a different size than the second sensor, and Wherein the size of the third sensor is different from the size of the fourth sensor.
19. 19. The voltage measurement device of claim 17, further comprising: a first fastener, a second fastener, a third fastener, and a fourth fastener, securing the bus bar, Wherein the first fastener and the second fastener are electrically connected to the first terminal, Wherein a distance from the shunt resistor in the first direction to each of the first and second fasteners is longer than a distance from the shunt resistor in the first direction to each of the first and third sensors, and Wherein the third fastener and the fourth fastener are electrically connected to the second terminal, and a distance from the shunt resistor in the first direction to each of the third fastener and the fourth fastener is longer than a distance from the shunt resistor in the first direction to each of the second sensor and the fourth sensor.
20. 20. The voltage measurement device of claim 19 wherein the first fastener, the first sensor, the second sensor, and the third fastener are positioned along a first line in the first direction, and Wherein the second fastener, the third sensor, the fourth sensor, and the fourth fastener are disposed along a second straight line in the first direction.

Description

Voltage measuring device Technical Field The present disclosure relates to a voltage measurement device for measuring voltages in multiple sub-regions of a shunt resistor. Background Unlike primary batteries that are designed to be non-rechargeable, secondary (or rechargeable) batteries may be discharged and recharged. Low-capacity secondary batteries are used in portable small-sized electronic devices such as smart phones, multi-function phones, notebook computers, digital cameras, and video cameras. A large-capacity secondary battery is widely used as a power source for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., household-scale and/or utility-scale electric power storage). The secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. When a rechargeable battery such as a lithium ion battery is repeatedly charged and discharged, the life of the battery may be shortened or the performance of the battery may be deteriorated. For this and other reasons, a Battery Management System (BMS) may be installed in an electric vehicle, an energy storage system, and the like to periodically monitor the state of a battery. In general, a battery management system may be configured to monitor voltage, current, temperature, and the like of a battery and manage charge and discharge of the battery. The battery management system may measure the voltage of the shunt resistor provided in the partial section in which the battery cells are connected. Problems may occur in the shunt resistance due to continuous use of the device or system connected to the battery cell or the surrounding environment. However, the battery management system may not recognize the problem occurring in the shunt resistor, and the battery management system may not have a configuration to detect the problem occurring in the shunt resistor. The information disclosed in this section is used to enhance understanding of the background of the disclosure. The information may contain information that does not constitute a related art or a prior art. Disclosure of Invention The present disclosure provides a voltage measurement device for solving the above-described problems. However, the present disclosure is not limited to solving such a problem. Aspects and features of the present disclosure will be described in, or will be apparent from, the following description of the embodiments of the present disclosure. According to some embodiments of the present disclosure, a voltage measurement device includes a bus bar electrically connected to a first terminal and a second terminal of a battery cell, the bus bar extending in a first direction, a shunt resistor located on the bus bar and extending in a second direction intersecting the first direction, and a measurement device configured to measure a first voltage value applied to a first sub-region of the shunt resistor and to measure a second voltage value applied to a second sub-region of the shunt resistor. According to some embodiments of the present disclosure, the voltage measurement device may further include first and second sensors located at opposite ends of the first sub-region, each of the first and second sensors having measurement terminals disposed thereon for measuring a voltage by the measurement device, and third and fourth sensors located at opposite ends of the second sub-region, each of the third and fourth sensors having measurement terminals disposed thereon for measuring a voltage by the measurement device. According to some embodiments of the present disclosure, the measuring device may further measure a third voltage value applied between the first sensor and the fourth sensor, and may measure a fourth voltage value applied between the third sensor and the second sensor. According to some embodiments of the present disclosure, the first sensor and the third sensor may be disposed adjacent to a first side of the shunt resistor, and the second sensor and the fourth sensor may be disposed adjacent to a second side of the shunt resistor opposite the first side of the shunt resistor. According to some embodiments of the present disclosure, the first sensor may be symmetrical to the second sensor about a center line of the shunt resistor, and the third sensor may be symmetrical to the fourth sensor about a center line of the shunt resistor. According to some embodiments of the present disclosure, the size of the first sensor may be different from the size of the second sensor, and the size of the third sensor may be different from the size of the fourth sensor. According to some embodiments of the present disclosure, the voltage measurement device may further include a first fastener and a second fastener to secure the bus bar. The distance from the shunt resistor in the first directi