CN-115902669-B - Battery sensor for detecting charge current and discharge current

Abstract

The invention relates to a battery sensor for detecting a charge current and a discharge current of a battery, in particular of a vehicle battery, wherein the battery sensor has a first current path for the charge current of the battery, and in addition thereto has a second current path for the discharge current and at least one current measuring device for detecting the charge current and the discharge current, characterized in that the first current path and the second current path have a common line section.

Inventors

• H. Franzel
• SCHRAMME MARTIN
• A. Omer

Assignees

• 大陆汽车科技有限公司

Dates

Publication Date

20260512

Application Date

20220922

Priority Date

20210923

Claims (12)

1. 1. A battery sensor for detecting a charging current and a discharging current of a battery, wherein the battery sensor has a first current path for the charging current of the battery and, in addition thereto, a second current path for the discharging current and at least one current measuring device for detecting the charging current and the discharging current, characterized in that the first current path and the second current path have a common line section, wherein further current measuring devices are provided in the common line section, wherein the at least one current measuring device and the further current measuring devices only detect measured values, and wherein these measured values are processed in a common evaluation unit.
2. 2. The battery sensor of claim 1, having a charging current contact for the first current path and a discharging current contact for the second current path, and having a battery contact for contacting the battery, wherein the common line section is connected to the battery contact.
3. 3. The battery sensor of claim 2, wherein the resistance of the first current path is less than the resistance of the second current path.
4. 4. A battery sensor according to claim 2 or 3, characterized in that the battery sensor has an electrical conductor extending from the discharge current contact to the battery contact, wherein the charge current contact is arranged on the electrical conductor between the charge current contact and the battery contact.
5. 5. Battery sensor according to claim 1 or 2, characterized in that at least one first measuring section is provided in the common line section, wherein the measuring section has at least one first current measuring device for detecting a current flowing through the measuring section.
6. 6. The battery sensor according to claim 5, characterized in that a second measuring section is provided in the first current path outside the common line section, wherein the second measuring section has at least one second current measuring device.
7. 7. The battery sensor according to claim 6, characterized in that a third measuring section is provided in the second current path outside the common line section, wherein the third measuring section has at least one third current measuring device.
8. 8. The battery sensor according to claim 7, characterized in that the first, second and/or third measuring section has at least one measuring resistor, wherein the first, second and/or third current measuring means has a voltage detection means which is able to detect a voltage drop over the measuring resistor.
9. 9. The battery sensor according to claim 7, characterized in that at least one magnetic current sensor is provided on the first, the second and/or the third measuring section.
10. 10. A battery sensor according to claim 1 or 2, characterized in that the battery sensor has wireless receiving means for receiving current measurement values.
11. 11. The battery sensor of claim 1, wherein the battery is a vehicle battery.
12. 12. The battery sensor of claim 10, wherein the current measurement is a current measurement of a charging current.

Description

Battery sensor for detecting charge current and discharge current Technical Field The present invention relates to a battery sensor for detecting a charge current and a discharge current of a battery, particularly a vehicle battery. Background Batteries with high voltages are used in vehicles, in particular in electric or hybrid vehicles. The battery current needs to be continuously detected while the vehicle is running in order to be able to accurately account for the charge of the vehicle battery. This relates both to the charging current of the battery and to the discharging current of the battery, i.e. the current consumption of the vehicle. In order to significantly shorten the charging time, the charging current is significantly greater than the discharging current generated during normal vehicle operation. The problem here is that the higher charge current generated in the charged state and the discharge current generated in the normal vehicle operation are measured with the same accuracy. A current sensor designed for a charging current is, for example, not suitable for detecting with sufficient accuracy a current which is significantly smaller than the charging current and which is generated during normal vehicle operation. Disclosure of Invention The object of the present invention is to provide a battery sensor which is suitable for detecting both charging current and discharging current. In order to achieve this object, a battery sensor for detecting a charging current and a discharging current of a battery, in particular of a vehicle battery, is proposed, wherein the battery sensor has a first current path for the charging current of the battery, a second current path for the discharging current, and at least one current measuring device for detecting the charging current and the discharging current. The first current path and the second current path have a common line section. The invention is based on the consideration that a plurality of current paths are provided in the battery sensor, which are designed for a correspondingly generated charging current and discharging current. In order to keep the manufacturing costs as low as possible, a common line section is provided for both current paths. At least one of the current paths has a further line section in addition to the common line section. The line section can be used, for example, to reduce the voltage by means of a series resistor, so that the measuring range of the current measuring devices arranged in the shared line section can detect the currents of the two current paths with the same accuracy. Alternatively, separate current measuring devices, whose measuring ranges are designed for the respective currents to be detected, may be provided in separate line sections of the two current paths. Additional current measuring means may be provided in the common line section for plausibility testing of the detected current. The arrangement of the current measuring device outside the common line section has the advantage that the measuring accuracy of the current measuring device can be adapted to the respective measuring range. Thus, for example, a high-precision current measurement device for discharge current is not affected by a very high charge current. This can delay the aging process or lengthen the calibration interval, for example. However, independent of this, further components of the two current measuring devices, such as an evaluation unit, can be used within the battery sensor. For example, it is also possible for the current measuring device to detect only measured values and for these measured values to be processed in a common evaluation unit. Preferably, the resistance of the first current path is smaller than the resistance of the second current path. The current intensity of the charging current is usually significantly greater than the current intensity of the discharging current. Importantly, the charging current is conducted to the battery with low loss power. The first current path of the charging current is required to have a small resistance. For example, the battery sensor has a charging current contact for a first current path and a discharging current contact for a second current path, and a battery contact for contacting the vehicle battery, wherein the common line section is connected to the battery contact. In the above embodiments, the battery sensor may have an electrical conductor extending from the discharge current contact to the battery contact, wherein the charge current contact is disposed on the electrical conductor between the charge current contact and the battery contact. Thus, the battery sensor has only one electrical conductor, wherein the discharge current flows through the entire electrical conductor and the charging current flows through only a partial region of the electrical conductor, i.e. the common line section. The above-described structure can be realized at very low construction costs