CN202093150U - Battery detection system and battery power supply system - Google Patents

Abstract

The utility model provides a detecting system of group battery, group battery include a plurality of battery cell through connecting wire series connection, detecting system include a plurality of first voltage detection device that correspond with battery cell, and each first voltage detection device is parallelly connected with the battery cell that corresponds through two detection lines respectively, and wherein the utmost point post of the battery cell that the detection line lug connection corresponds to make the first voltage between the two poles of the earth post of the battery cell that first voltage detection device lug detection corresponds. The utility model also provides a battery power supply system. In this way, the utility model discloses a detecting system and battery power supply system of group battery pass through the voltage between the two poles of the earth post of the direct detection battery unit of detection line, and then can detect every battery unit's voltage accurately to can judge the connection status of group battery.

Description

Battery detection system and battery power supply system

technical field

The utility model relates to the technical field of battery management, in particular to a detection system of a battery pack and a battery power supply system.

Background technique

During the use of the battery, the battery is usually used in series to provide a higher output voltage and a larger power capacity to meet the demand for load driving. However, no matter whether it is a lithium rechargeable battery, a lead-acid rechargeable battery or a nickel-metal hydride rechargeable battery, due to the limitation of its process conditions, there are certain differences between the battery cells. Therefore, a voltage detection device is needed to detect the voltage of the battery cell in real time.

Please refer to FIG. 1 , which is a battery pack testing system in the prior art. As shown in FIG. 1 , a detection system 10 for a battery pack includes a plurality of voltage detection devices (not shown). Wherein, the battery pack includes battery units BT1, BT2, BT3 and BT4. Wherein, the battery cells BT1 , BT2 , BT3 and BT4 are connected in series through connection lines 101 , 102 and 103 . The voltage detection device detects the voltages Vb1, Vb2, Vb3 and Vb4 across the battery cells BT1, BT2, BT3 and BT4 through the detection lines 104, 105, 106, 107 and 108 connected to the connection lines 101, 102 and 103. When the battery pack is connected to an external load, the detected voltages Vb1, Vb2, Vb3, and Vb4 not only include the voltage drop between the poles of the battery cells BT1, BT2, BT3, and BT4, but also include the voltage drops of the battery cells BT1, BT2, BT3, and The voltage drop on the connecting wires 101, 102 and 103 between BT4 and the voltage drop between the connecting wires 101, 102 and 103 and the contact surface of the pole makes the result detected by the voltage detection device have a large error. When the connecting wires 101 , 102 and 103 are in poor contact with the poles, the voltage detection device cannot detect the voltages of the battery cells BT1 , BT2 , BT3 and BT4 . In addition, the voltage Vb across the battery pack is directly obtained by summing the voltages Vb1 , Vb2 , Vb3 and Vb4 . Due to the voltage drop of the connecting wires 101 , 102 and 103 and the voltage drop between the connecting wires 101 , 102 and 103 and the contact surfaces of the poles, the voltage across the battery pack has greater error. Furthermore, the detection system of the existing battery pack cannot judge the connection status of the battery pack. When the connecting wires 101 , 102 , and 103 are in poor contact with the poles, additional energy consumption will be generated due to the increase in the internal resistance of the battery pack.

Therefore, it is necessary to provide a detection system for a battery pack to solve the problem that the voltage detection device in the prior art cannot accurately detect the voltage of each battery cell.

Utility model content

The technical problem mainly solved by the utility model is to provide a detection system of a battery pack to accurately detect the voltage of each battery unit.

In order to solve the above-mentioned technical problems, a technical solution adopted by the utility model is to provide a detection system for a battery pack, the battery pack includes a plurality of battery units connected in series through connecting wires, and the detection system includes a plurality of first battery units corresponding to the battery units. A voltage detection device, each first voltage detection device is connected in parallel with the corresponding battery unit through two detection lines, wherein the detection line is directly connected to the pole of the corresponding battery unit, so that the first voltage detection device directly detects the corresponding battery cell The first voltage across the poles of the cell.

According to a preferred embodiment of the present invention, the detection system further includes a second voltage detection device, and the second voltage detection device is connected in parallel with the battery pack through the detection line directly connected to the two ends of the battery pack to detect the two ends of the battery pack. The second voltage between the columns.

According to a preferred embodiment of the present invention, the detection system further includes a current detection device connected in series with the battery pack to detect the loop current of the battery pack.

According to a preferred embodiment of the present invention, the detection system further includes a processor, and the processor judges the connection state of the battery pack according to the first voltage, the second voltage and the loop current.

In order to solve the above technical problems, another technical solution adopted by the utility model is to provide a battery power supply system, the battery power supply system includes a battery pack and a detection system, the battery pack includes a plurality of battery units connected in series by connecting wires, and the detection system It includes a plurality of first voltage detection devices corresponding to the battery cells, each of the first voltage detection devices is connected in parallel with the corresponding battery cells through two detection lines, wherein the detection lines are directly connected to the poles of the corresponding battery cells, so as to The first voltage detection device directly detects the first voltage between the two poles of the corresponding battery unit.

According to a preferred embodiment of the present invention, the detection system further includes a second voltage detection device, and the second voltage detection device is connected in parallel with the battery pack through the detection line directly connected to the two ends of the battery pack to detect the two ends of the battery pack. The second voltage between the columns.

According to a preferred embodiment of the present invention, the detection system further includes a current detection device connected in series with the battery pack to detect the loop current of the battery pack.

According to a preferred embodiment of the present invention, the detection system further includes a processor, and the processor judges the connection state of the battery pack according to the first voltage, the second voltage and the loop current.

The beneficial effects of the utility model are: different from the situation of the prior art, the detection system of the battery pack and the battery power supply system of the utility model directly detect the voltage between the two poles of the battery unit through the detection line, and then can accurately detect each The voltage of the battery cell, and can judge the connection status of the battery pack.

Description of drawings

Fig. 1 is a schematic diagram of a detection system of a battery pack in the prior art; and

Fig. 2 is a schematic diagram of a detection system for a battery pack according to a first embodiment of the present invention.

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a detection system for a battery pack according to a first embodiment of the present invention. As shown in Figure 2, the battery pack includes battery cells BT1, BT2, BT3 and BT4 connected in series through connecting wires 213, 223 and 233, and the detection system 20 of the battery pack of the present invention includes: first voltage detection devices 21, 22 , 23 and 24, a second voltage detection device 25, a processor 26, and a current detection device 27. Wherein, the first voltage detection devices 21 , 22 , 23 and 24 correspond to the battery cells BT1 , BT2 , BT3 and BT4 .

In this embodiment, the first voltage detection device 21 is connected in parallel with the battery unit BT1 through two detection lines 211 and 212, and the detection lines 211 and 212 are directly connected to the poles of the battery unit BT1, so that the first voltage detection device 21 directly detects the battery The first voltage Vb1 between the two poles of the unit BT1. The first voltage detection device 22 is connected in parallel with the battery unit BT2 through two detection lines 221 and 222, and the detection lines 221 and 222 are directly connected to the two poles of the battery unit BT2, so that the first voltage detection device 22 directly detects the voltage between the two poles of the battery unit BT2. The first voltage Vb2. The first voltage detection device 23 is connected in parallel with the battery unit BT3 through two detection lines 231 and 232, and the detection lines 231 and 232 are directly connected to the two poles of the battery unit BT3, so that the first voltage detection device 23 directly detects the voltage between the two poles of the battery unit BT1. The first voltage Vb3. The first voltage detection device 24 is connected in parallel with the battery unit BT4 through two detection lines 241 and 242, and the detection lines 241 and 242 are directly connected to the two poles of the battery unit BT4, so that the first voltage detection device 24 directly detects the voltage between the two poles of the battery unit BT4. The first voltage Vb4.

The second voltage detection device 25 is connected in parallel with the battery pack through the detection lines 251 and 252 directly connected to the two poles of the battery pack to detect the second voltage V between the two poles of the battery pack. Wherein, the poles at both ends of the battery pack are the negative pole of the battery unit BT1 and the positive pole of the battery unit BT4.

The current detecting device 27 is connected in series with the battery pack, and is used for detecting the loop current I of the battery pack.

The processor 26 is respectively connected with the second voltage detection device 25, the current detection device 27 and the first voltage detection devices 21, 22, 23 and 24 to receive the second voltage V, the loop current I of the battery pack and the first voltage Vb1, Vb2, Vb3 and Vb4. The processor 26 obtains the connection lines 213, 223 and 233 and the connection lines 213, 223 by dividing the difference between the second voltage V and the summation result of the first voltages Vb1, Vb2, Vb3 and Vb4 by the loop current I of the battery pack. and the sum of the resistance values between 233 and the contact surface of the corresponding pole. The processor 26 further judges the connection status of the battery pack according to the sum of the resistance values. Specifically, when the sum of the resistance values is greater than a certain threshold, it is determined that the battery pack has poor connection.

In specific use, each of the first voltage detection devices 21, 22, 23 and 24 is connected to the corresponding battery cells BT1, BT2, BT3 and BT4 through the detection lines 211, 212, 221, 222, 231, 232, 241 and 242 respectively. In parallel, the detection lines 211, 212, 221, 222, 231, 232, 241 and 242 are directly connected to the poles of the corresponding battery units BT1, BT2, BT3 and BT4, so that the detection system 20 of the battery pack can avoid detecting the connection line 213 , 223 and 233 and the voltage drop between the connecting lines 213, 223 and 233 and the contact surfaces of the corresponding poles, thereby improving the detection accuracy of the detection system 20 of the battery pack, and obtaining the connecting line 213, 223 and 233 and the resistance values between the connecting wires 213, 223 and 233 and the contact surfaces of the corresponding poles are used to determine the connection state of the battery pack.

In a preferred embodiment, the battery units BT1, BT2, BT3 and BT4 are battery cells or a plurality of battery cells connected in parallel.

In other preferred embodiments, there are not only four first voltage detection devices, but other numbers of first voltage detection devices can also be used.

Through the above method, the detection system of the battery pack of the present invention directly detects the voltage between the two poles of the battery unit through the detection line, thereby accurately detecting the voltage of each battery unit and judging the connection state of the battery pack.

In addition, the utility model also provides a battery power supply system comprising the above-mentioned battery pack, a first voltage detection device, a second voltage detection device, a current detection device and a processor.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (8)

1. the detection system of an electric battery, described electric battery comprises a plurality of battery units that are connected in series by connecting line, it is characterized in that, described detection system comprises a plurality of first voltage check devices corresponding with described battery unit, each described first voltage check device is respectively by two detection lines and corresponding described battery unit parallel connection, wherein said detection line directly connects the pole of corresponding described battery unit, so that described first voltage check device directly detects first voltage of the two poles of the earth intercolumniation of corresponding described battery unit.

2. detection system according to claim 1, it is characterized in that, described detection system further comprises second voltage check device, described second voltage check device is in parallel with described electric battery by the detection line of two ends pole of the direct described electric battery of connection, with second voltage between the two ends pole that detects described electric battery.

3. detection system according to claim 2 is characterized in that described detection system further comprises current sensing means, and described current sensing means and described electric battery are connected in series, to detect the loop current of described electric battery.

4. detection system according to claim 3 is characterized in that described detection system further comprises processor, and described processor is judged the connection status of described electric battery according to described first voltage, described second voltage and described loop current.

5. battery power supply system, described battery power supply system comprises electric battery and detection system, described electric battery comprises a plurality of battery units that are connected in series by connecting line, it is characterized in that, described detection system comprises a plurality of first voltage check devices corresponding with described battery unit, each described first voltage check device is respectively by two detection lines and corresponding described battery unit parallel connection, wherein said detection line directly connects the pole of corresponding described battery unit, so that described first voltage check device directly detects first voltage of the two poles of the earth intercolumniation of corresponding described battery unit.

6. battery power supply system according to claim 5, it is characterized in that, described detection system further comprises second voltage check device, described second voltage check device is in parallel with described electric battery by the detection line of two ends pole of the direct described electric battery of connection, to detect second voltage between the pole of described electric battery two ends.

7. battery power supply system according to claim 6 is characterized in that described detection system further comprises current sensing means, and described current sensing means and described electric battery are connected in series, to detect the loop current of described electric battery.

8. battery power supply system according to claim 7 is characterized in that described detection system further comprises processor, and described processor is judged the connection status of described electric battery according to described first voltage, described second voltage and described loop current.

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