CN211928124U

CN211928124U - Battery pack monitoring device with service life detection function

Info

Publication number: CN211928124U
Application number: CN201922138222.0U
Authority: CN
Inventors: 李瑞津; 刘斌; 刘祺; 毕小熊; 党军朋; 邓云书; 李涛; 张学敏; 郭伟; 王斌; 胡云; 施迎春; 岳斌; 赵华; 叶文华; 陈运忠; 潘再金
Original assignee: Yuxi Power Supply Bureau of Yunnan Power Grid Co Ltd
Current assignee: Yuxi Power Supply Bureau of Yunnan Power Grid Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-11-13
Anticipated expiration: 2029-12-03

Abstract

The utility model relates to a group battery monitoring devices that area life-span detected, include: the direct current side of the AC/DC circuit is connected with the battery pack and the load end; a charging branch and a discharging branch are arranged between the direct current side of the AC/DC circuit and the battery pack, and the charging branch is connected with the discharging branch in parallel; the charging branch comprises a semiconductor switch tube and a first optical coupling element which are connected in series; the discharging branch circuit comprises a discharging diode and a second optical coupling element which are connected in series; the first and second light coupling elements are connected with the BMS. When the BMS detects the corresponding signals of G1, G2, it is interpreted that the discharging or charging is started. At this time, the BMS may count the number of times of charge and discharge to realize the life detection.

Description

Battery pack monitoring device with service life detection function

Technical Field

The utility model relates to a group battery monitoring devices, especially a group battery monitoring devices with life-span detects.

Background

In the prior art, the battery pack is monitored generally by a BMS (battery management system), and only the voltage signal and the current signal are detected, so that the function is single.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a take group battery monitoring devices of life-span detection for the life-span of further detection group battery.

The technical scheme of the utility model is specifically as follows:

a battery pack monitoring device with life detection, comprising: the direct current side of the AC/DC circuit is connected with the battery pack and the load end; a charging branch and a discharging branch are arranged between the direct current side of the AC/DC circuit and the battery pack, and the charging branch is connected with the discharging branch in parallel; the charging branch comprises a semiconductor switch tube and a first optical coupling element which are connected in series; the discharging branch circuit comprises a discharging diode and a second optical coupling element which are connected in series; the first and second light coupling elements are connected with the BMS.

Further, the primary side of the second optocoupler is connected in series with the discharge diode, and the secondary side is connected with the BMS.

Furthermore, the primary side of the first optocoupler element is connected in series with the semiconductor switching tube, and the secondary side of the first optocoupler element is connected with the BMS.

Furthermore, an anti-reverse diode is connected in series between the direct current side of the AC/DC circuit and the load end, and the charging branch and the discharging branch are connected to the load end.

Furthermore, the primary side of the first optical coupling element is connected in series in the charging branch, and the secondary transformer is connected with a high level through a pull-up resistor.

Furthermore, the primary side of a second optical coupling element is connected in series in the discharge branch, and the secondary transformer is connected with a high level through a pull-up resistor.

Further, the alternating current side of the AC/DC circuit is connected with an alternating current power supply.

Compared with the prior art, the beneficial effects of the utility model are as follows:

through the utility model discloses a setting, when BMS detected opto-coupler element G1, G2's corresponding signal, the explanation began to discharge or charge. At this time, the BMS may count to thereby realize the detection of the number of charge and discharge times, which is closely related to the battery life, and then, the BMS may estimate the battery life in combination with other factors (e.g., voltage, current) according to the detected number of charge and discharge times.

Drawings

Fig. 1 is a schematic circuit diagram of the apparatus of the present invention;

fig. 2 is a schematic circuit diagram of the optical coupler element G1 of the apparatus of the present invention;

fig. 3 is a schematic circuit diagram of the optical coupler element G2 of the apparatus of the present invention;

fig. 4 is a schematic circuit diagram of another embodiment of the apparatus of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some examples of the present invention, not all examples. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

Example 1

As shown in fig. 1, the battery pack monitoring device with life detection of the present embodiment.

The present embodiment is described by taking a lead-acid battery as an example. Of course, the present invention is also applicable to other batteries such as lithium batteries.

The device comprises a BMS (not shown in the figures) which is capable of detecting voltage signals, current signals etc., which is prior art and will not be described in detail herein.

The present embodiment is characterized in that it can monitor the life of the battery pack, and the idea is implemented by detecting the number of times of charging and discharging.

Specifically, the charging and discharging circuit of the battery pack comprises an AC/DC circuit, wherein the AC side of the AC/DC circuit is connected with an AC power supply, and the DC side is used for connecting the battery pack and a load. A charging branch and a discharging branch are arranged between the direct current side and the battery pack, and the charging branch is connected with the discharging branch in parallel.

As shown in fig. 1, the charging branch includes a MOS transistor (other types of semiconductor switch transistors may be used) and an optical coupling element G2, which are connected in series. The charging is for a battery pack.

The discharge branch comprises a discharge diode D2 and an optocoupler G1, which are connected in series. The current direction of the diode D2 is opposite to that of the MOS transistor. The discharge is for a battery pack.

The advantage of the above circuit is that diode D2 blocks the supply of the battery pack to the load if the DC side voltage of the AC/DC circuit is slightly higher than the battery pack voltage. At the moment, the BMS realizes the charging of the direct-current lateral battery pack by controlling the MOS tube. Therefore, the battery pack does not discharge when being charged, and the service life of the battery can be prolonged.

As shown in fig. 2,

primary sides

1 and 2 of the optical coupling element G1 are connected in series in the discharge branch, and the secondary transformer is connected with high level through a pull-up resistor R1. Therefore, the BMS can detect a low level generated when the discharging branch has a current, i.e., is discharged. When there is a current, the optical coupler is turned on, and the sensing terminal is grounded so that the BMS senses a low level.

Similarly, as shown in fig. 3, the

primary sides

3 and 4 of the optical coupling element G2 are connected in series in the charging branch, and the secondary side is connected with high level through a pull-up resistor R2. Therefore, the BMS can detect a low level generated when the charging branch has a current, i.e., charging. When there is a current, the optical coupler is turned on, and the sensing terminal is grounded so that the BMS senses a low level.

Therefore, when the BMS detects that the light coupling elements G1, G2 generate a low level transition, it indicates that discharging or charging is started. The BMS may count the number of charge and discharge times, which are closely related to the life of the battery, at this time, and thus the BMS may estimate the life of the battery according to the detected number of charge and discharge times in combination with other factors (e.g., voltage, current). Regarding how to evaluate, which is not of concern for the present invention, the relevant technical means can be selected from the prior art.

Example 2

The battery pack monitoring device with life detection of the present embodiment.

As shown in fig. 4, the present embodiment is different from embodiment 1 only in that an anti-reverse diode is connected in series between the DC side and the load side of the AC/DC circuit to avoid the impact of reverse current on the AC/DC circuit. The charging branch and the discharging branch are connected to the load end.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a take life-span detection's group battery monitoring devices which characterized in that includes:

the direct current side of the AC/DC circuit is connected with the battery pack and the load end; a charging branch and a discharging branch are arranged between the direct current side of the AC/DC circuit and the battery pack, and the charging branch is connected with the discharging branch in parallel;

the charging branch comprises a semiconductor switch tube and a first optical coupling element which are connected in series;

the discharging branch circuit comprises a discharging diode and a second optical coupling element which are connected in series;

the first and second light coupling elements are connected with the BMS.

2. The battery pack monitoring device with lifetime detection as claimed in claim 1, wherein the primary side of the second optocoupler is connected in series with the discharge diode, and the secondary side is connected to a BMS.

3. The battery pack monitoring device with life span detection as claimed in claim 1, wherein the primary side of the first optocoupler is connected in series with the semiconductor switching tube, and the secondary side is connected to a BMS.

4. The battery pack monitoring device with life detection according to claim 1, wherein an anti-reverse diode is connected in series between a direct current side of the AC/DC circuit and a load terminal, and the charging branch and the discharging branch are connected at the load terminal.

5. The battery pack monitoring device with life detection as claimed in claim 3, wherein the primary side of the first optical coupling element is connected in series in the charging branch, and the secondary side is connected with high level through a pull-up resistor.

6. The battery pack monitoring device with life detection as claimed in claim 2, wherein the primary side of the second optical coupling element is connected in series in the discharging branch, and the secondary side is connected with high level through a pull-up resistor.

7. The battery pack monitoring device with life span detection according to any one of claims 1 to 6, wherein the AC side of the AC/DC circuit is connected to an AC power source.