TW201824630A - Charging monitoring device for cascaded battery pack capable of monitoring energy storage states of battery cells to maintain charging balance - Google Patents

Abstract

The invention provides a charging monitoring device for cascaded battery pack, wherein the cascaded battery pack is composed of a plurality of battery cells in series connection. The charging monitoring device comprises a plurality of monitoring modules respectively connected in parallel to one of the battery cells, and each of the monitoring modules is respectively provided with a simulation load, a detection unit capable of measuring the energy storage state of one of the battery cells to generate an energy storage state data, and a determination unit that is connected to the simulation load and the detection unit and stored with a normal battery charging data. Each of the determination units may compare one of the energy storage state data with one of the normal battery charging data by a program control method to determine whether to enable one of the simulation loads to discharge one of the battery cells. Thus, the invention may solve the problem of a conventional structure that cannot monitor each of the batteries, respectively.

Description

Charging monitoring device for series battery pack

The present invention relates to a charging monitoring device for a series battery pack, and more particularly to a charging monitoring device capable of monitoring the energy storage state of a plurality of battery cells in series to maintain the charging balance.

With the current development of electronic technology, high-voltage series battery packs have been widely used in electric vehicles, hybrid electric vehicles, and industrial backup batteries. In detail, because the manufacturing status of each battery cell in the series battery pack is slightly different, it makes it very easy for the series battery pack to be charged too quickly due to the manufacturing differences between the battery cells. And some of the battery cells are charged too fast. Under this condition, some of the charged battery cells will be forced to continue to be charged because of the uncharged partial battery cells, which may cause damage to the partially charged battery cells.

In order to solve the problem of uneven charging of the tandem battery pack in the series connection due to the manufacturing differences of the battery cells, various manufacturers have gradually developed related solutions. For example, the Republic of China Patent Publication No. I538348 discloses a battery balance load control unit. The battery balance load control unit can charge balance a first battery unit and a second battery unit connected in series with each other. The first battery unit has a first positive terminal and a first negative terminal, the second battery unit has a second positive terminal and a second negative terminal, and the battery balanced load control unit includes a balancing module, a comparison Circuit and a balance judgment circuit. When the battery balanced load control unit is actually used, the comparison circuit detects the first battery unit and the second battery unit to obtain a detection signal, and then judges the detection signal and a balanced reference signal. The potentials are compared to output a comparison result signal to the balance judgment circuit. Then, the balance judgment circuit determines whether the change of the signal state of the comparison result continues for more than a predetermined judgment time. If so, the balance judgment circuit controls one of the first battery unit and the second battery unit to have a higher battery. The voltage person releases part of the power or current to the balancing module, thereby achieving the charging balance of the first battery unit and the second battery unit in a series state.

In addition, the Republic of China Patent Bulletin No. I511413 also discloses a device for active balance control by means of voltage information sharing. The device includes a power supply device. The power supply device has a plurality of power supply modules. The module has a plurality of battery modules connected in series, and each of the battery modules has a battery unit. In addition, the device further includes a specific battery module, a voltage information sharing port, and a judgment circuit. The specific battery module is one of the battery modules, the active balancing circuit is electrically connected to the specific battery module, and the voltage information sharing port is set in a specific power supply module in the power supply modules. The group is electrically connected to the voltage information sharing port of other battery modules, and the judgment circuit is electrically connected to the specific battery module, the active balancing circuit, and the voltage information sharing port. When the device is in actual use, the judgment circuit can obtain a first voltage information from the specific battery module and a second voltage information from other battery modules through the voltage information sharing port, and then according to the first voltage information and The second voltage information is used to determine whether to drive the active balancing circuit to charge balance the specific battery module.

However, from the contents of the I538348 and I511413 patent cases, it can be found that Figures 1 to 11 of the I538348 patent case have clearly shown that the battery balancing load control unit uses an analog circuit to the first battery unit and the first battery unit. The two battery cells are charge-balanced. Figures 1 to 9 of the I511413 patent case also clearly show that the device uses the analog circuit to charge-balance these battery modules. It can be seen that the I538348 and I511413 patent cases The charging device cannot monitor and discharge control the charging status of each battery. That is to say, the charging device in the previous two cases cannot monitor the heavy power balance of each battery at any time and regularly through the method of program control. In this way, each battery can be tested separately when the batteries are disconnected from the series state, and the charging operation when each battery is in the series state will also cause charging imbalance.

The main object of the present invention is to solve the problem that the conventional structure cannot monitor the status of each battery separately when the batteries are connected in series, and the charging imbalance occurs.

In order to achieve the above object, the present invention provides a charging monitoring device for a series battery pack. The series battery pack is charged by receiving power provided by a power supply unit. The series battery pack has a plurality of battery cells connected in series. It is characterized in that the charging monitoring device has a plurality of monitoring modules, each of which is independently connected in parallel with one of the battery cells, and each of the monitoring modules has a selective start and one of the batteries An analog load in parallel with a unit, a detection unit connected in parallel with one of the battery cells and measuring the energy storage status of one of the battery cells to generate an energy storage status data, and a coexistence connection with the analog load and the detection unit There is a judgment unit for normal charging data of the battery. Each judgment unit compares one of the energy storage state data with one of the battery normal charging data. If the comparison is normal, one of the simulated loads is disabled. If the comparison is abnormal, , Enabling one of the analog loads to cause one of the battery cells to discharge one of the analog loads.

In an embodiment, when each of the judgment units compares one of the energy storage status data with one of the battery normal charging data, if the comparison is abnormal, the impedance value of one of the analog loads is adjusted so that one of the batteries The unit discharges according to the impedance value of one of the simulated loads. Further, each of the analog loads is a dummy load or an electronic load, and each of the monitoring modules has an electrical connection between the judgment unit and one of the analog loads and the impedance value of the analog load can be adjusted. Load control unit. Each of the analog loads is a MOSFET control load.

In an embodiment, each of the energy storage status data includes a charging current value of one of the battery cells and a charging voltage value of one of the battery cells, and each of the detection units has a A current detector for the battery unit charging current value and a voltage detector for detecting one of the battery unit charging voltage values.

In an embodiment, each of the energy storage status data includes a charging current value of one of the battery cells or a charging voltage value of one of the battery cells, and each of the detection units has a A current detector for the battery unit charging current value or a voltage detector for detecting one of the battery unit charging voltage values.

In one embodiment, the charging monitoring device has a master that is electrically connected to each of the monitoring modules and is configured with normal charging data of each battery for each of the judgment units to obtain one of the battery normal charging data respectively. Control unit.

In one embodiment, the charging monitoring device has a plurality of isolation units that are electrically connected between one of the battery units and the main control unit to isolate the main control unit when one of the battery units is burned out.

In one embodiment, the charging monitoring device has an isolation unit electrically connected to each of the battery units and the main control unit to avoid the main control unit and to isolate the main control unit when any of the battery units is burned out. .

In one embodiment, the main control unit is a single-chip microprocessor.

Through the above embodiments of the present invention, it has the following characteristics compared with the conventional one:

According to the present invention, each of the monitoring modules continuously judges the energy storage state of one of the battery cells through one of the detection units and one of the judgment units, and further disables each of the battery cells according to the energy storage state of each of the battery cells. Or enable one of the analog loads, thereby monitoring the discharging action of each of the battery cells separately to maintain a normal charging state, so that the battery cells can maintain a charging balance in a series state. The charging monitoring device discharges the battery cells through the analog loads, so that the monitoring modules can balance the state of charge of one of the battery cells by a program setting method. This solves the problem that the conventional structure cannot monitor the status of each battery separately and has a charging imbalance.

The detailed description and technical contents of the present invention are described below with reference to the drawings:

Please refer to FIG. 1 and FIG. 2, the present invention provides a charging monitoring device for a series battery pack. Each of the monitoring modules 1 has an analog load 11, a detection unit 12, and a judgment unit 13. If the composition of a single monitoring module 1 is known, the analog load 11 and the detection unit 12 are both It is electrically connected to the determination unit 13. Specifically, the analog load 11 may be a dummy load (for example, a MOSFET control load) or an electronic load. The monitoring module 1 may include a load control unit 14, as shown in FIG. 5 As shown, the load control unit 14 can be driven by the judgment unit 13 to disable or enable the analog load 11, and the load control unit 14 can be used to adjust the impedance of the analog load 11 when the analog load 11 is enabled. value. On the other hand, in an embodiment, the detection unit 12 has a current detector and a voltage detector, and the detection unit 12 can operate through the determination unit 13 to detect the current value of the electronic component and Voltage value; in another implementation, the detection unit 12 has a current detector or a voltage detector, and the detection unit 12 can operate through the determination unit 13 to detect the current value of the electronic component or Voltage value.

The implementation aspect of the charging monitoring device can be understood from the foregoing technical content. Herein, the present invention will further explain the use process of the charging monitoring device and the implementation aspect generated with the use process. For details, please refer to FIG. 1 and FIG. 2. The series battery pack 2 includes a plurality of battery cells 21 connected in series. The battery cells 21 are electrically connected to a power supply unit 3. The power supply unit 3 is Power can be supplied to the battery cells 21 in a series state of the battery cells 21 to perform charging operations, as shown in FIG. 1. In addition, if the connection relationship between the charging monitoring device and the series battery pack 2 is known, each of the monitoring modules 1 is independently connected in parallel with one of the battery cells 21, and each of the analog loads 11 is separately connected to one of them. The battery unit 21 is connected in parallel, and each of the detection units 12 is connected in parallel with one of the battery units 21, accordingly, each of the battery units 21 can be discharged through one of the analog loads 11 in the subsequent process, and Each of the detection units 12 can measure the energy storage status of one of the battery units 21 respectively. When the battery units 21 connected in series are performing a charging operation, the charging monitoring device can perform charge balancing on one of the battery units 21 by each of the monitoring modules 1. If the charging balance of a single battery cell 21 is viewed from a single monitoring module 1, the detection unit 12 will generate an energy storage state data by measuring the energy storage state of the battery cell 21 (for example: At least one of the charging current value and the charging voltage value of the battery unit 21), and then, the determining unit 13 will store the energy storage state data and a battery normal charging data (for example, the battery unit 21 is The corresponding ideal charging current value or the ideal charging voltage value corresponding to each charging time point) for comparison. If the comparison is normal, it means that the battery unit 21 is in a normal charging state. At this time, the judgment unit 13 disables the Load 11 is simulated to prevent the battery unit 21 from discharging in a normal charging state; if the comparison is abnormal, it means that the battery unit 21 is in an abnormally charged state. At this time, the judgment unit 13 enables the simulated load 11 to The battery unit 21 is caused to discharge to one of the analog loads 11 so that the battery unit 21 in an abnormally charged state can maintain a normal charging state. In this way, each of the monitoring modules 1 can continuously determine the energy storage status of one of the battery cells 21 through one of the detection units 12 and one of the determination units 13, and then based on each of the battery cells 21 To disable or enable one of the analog loads 11 respectively. Wherein, since the charging monitoring device is used to discharge the battery cells 21 through the analog loads 11, the monitoring modules 1 can be used to charge one of the battery cells 21 in a programmed manner. State balance can be used to solve the problem that the conventional structure cannot monitor the status of each battery separately and has an imbalanced state of charge.

In more detail, the charging monitoring device may have a main control unit 4 during implementation, as shown in FIGS. 3 and 4. The main control unit 4 is a single-chip microprocessor, and each of the monitoring modules 1 is It is electrically connected to the main control unit 4. Among them, the single-chip microprocessor (ie, the main control unit 4) can set application programs for controlling each monitoring mode of the monitoring module 1 (for example, monitoring time and specific values of the normal charging data of the batteries, etc.) . According to the operating relationship between the main control unit 4 and the single monitoring module 1 and the single battery unit 21, the monitoring module 1 can be set at each predetermined time point according to the monitoring mode set by the main control unit 4. The battery unit 21 is monitored. Furthermore, the battery normal charging data is also set to the main control unit 4. The battery normal charging data includes the normal charging history of the battery unit 21 (for example, the ideal charging current corresponding to each charging time point). Value or ideal charging voltage value corresponding to each charging time point), the judging unit 13 may compare the energy storage state data of the battery unit 21 at each predetermined time point according to the battery normal charging data to determine whether The analog load 11 is enabled. Here, it should be noted that when the judgment unit 13 enables the analog load 11 when the energy storage status data is abnormally compared with the battery normal charging data, the judgment unit 13 will adjust through the load control unit 14 The resistance value of the analog load 11 is used to control the discharge amount of the battery unit 21 so that the energy storage state of the battery unit 21 can meet the normal charging data of the battery. Furthermore, in view that the battery unit 21 may have a large voltage capacity and a large charging current, the charging monitoring device of the present invention may also have a plurality of battery units 21 connected in parallel according to the charging current of the battery unit 21. The monitoring module 1 (the monitoring modules 1 are also connected in parallel with each other), thereby increasing the shunt path when the battery unit 21 is discharged, so that the charging monitoring device is suitable for charging the series battery pack 2 with a large voltage capacity. Balance work. In this regard, in one embodiment, the monitoring modules 1 can only set a monitoring mode by a single main control unit 4. In another embodiment, the monitoring modules 1 can pass multiple different The main control unit 4 sets a monitoring mode.

Because of the fact that each of the battery units 21 discharges one of the analog loads 11 with heat energy, in one embodiment, each of the monitoring modules 1 has a temperature monitoring unit (not shown in the figure). (Shown) and a fan (not shown), each of the temperature monitoring units can be used to measure the temperature of one of the battery units 21, and the temperature of one of the battery units 21 exceeds a normal temperature When the limit is reached, one of the fans is driven to dissipate heat from one of the battery cells 21. In addition, in view of the fact that the battery cells 21 may be burned due to abnormal manufacturing structures or abnormal charging states during charging, in an embodiment, as shown in FIG. 6, the charging monitoring device has a plurality of isolation units 5. Each of the isolation units 5 is electrically connected between one of the monitoring modules 1 and the main control unit 4. The isolation units 5 can isolate the main control unit 4 when one of the battery units 21 is burned out. In another embodiment, the charging monitoring device has an isolation unit 5 which is electrically connected between each of the monitoring modules 1 and the main control unit 4. The isolation unit 5 can be connected to any of the When the battery unit 21 is burned out, the main control unit 4 is isolated. Specifically, the isolation unit 5 has a power isolation circuit and a signal isolation circuit (eg, an I2C isolator). The power isolation circuit can be used to isolate voltage, and the signal isolation circuit can be used to isolate signals.

The present invention has been described in detail above, but the above is only one of the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the equality made according to the scope of patent application of the present invention Changes and modifications should still be covered by the patent of the present invention.

1‧‧‧Monitoring Module

11‧‧‧simulated load

12‧‧‧ Detection Unit

13‧‧‧Judgment unit

14‧‧‧Load Control Unit

2‧‧‧series battery pack

21‧‧‧ battery unit

3‧‧‧ Power Supply Unit

4‧‧‧ Master Control Unit

5‧‧‧ Isolation Unit

FIG. 1 is a schematic block diagram of a circuit of the present invention. FIG. 2 is a schematic circuit block diagram of a monitoring module according to the present invention. FIG. 3 is a schematic block diagram of a circuit when the present invention is implemented. FIG. 4 is a schematic circuit block diagram of the implementation of the monitoring module of the present invention. FIG. 5 is a schematic block diagram of a monitoring module circuit according to an embodiment of the present invention. FIG. 6 is a schematic block diagram of a monitoring module circuit according to another embodiment of the present invention.

Claims (10)

A charging monitoring device for a series battery pack. The series battery pack is charged by receiving power provided by a power supply unit. The series battery pack has a plurality of battery cells connected in series. The charging monitoring device is characterized by: There are a plurality of monitoring modules, each of which is independently connected in parallel with one of the battery cells, and each of the monitoring modules has an analog load which is selectively activated and is connected in parallel with one of the battery cells, one with One of the battery cells is connected in parallel and a detection unit for measuring the energy storage status of one of the battery cells to generate energy storage status data, and a determination unit connected to the analog load and the detection unit and storing normal battery charging data Each judgment unit compares one of the energy storage status data with one of the battery normal charging data. If the comparison is normal, one of the analog loads is disabled. If the comparison is abnormal, one of the analog loads is enabled. One of the battery cells is discharged to one of the simulated loads. The charging monitoring device for a series battery pack according to claim 1, wherein each of the judgment units compares one of the energy storage status data with one of the battery normal charging data, and if the comparison is abnormal, adjusts one of the The impedance value of the simulated load causes one of the battery cells to discharge according to the impedance value of one of the simulated loads. The charging monitoring device for a serial battery pack according to claim 2, wherein each of the analog loads is a dummy load or an electronic load, and each of the monitoring modules has an electrical connection to the judgment unit and one of the monitoring units. A load control unit that can adjust the impedance value of the analog load between the analog loads. The charging monitoring device for a series battery pack according to claim 3, wherein each of the analog loads is a MOSFET control load. The charging monitoring device for a series battery pack according to 2, 3 or 4, wherein each of the energy storage state data includes a charging current value of one of the battery cells and a charging voltage value of one of the battery cells, each of The detection units each have a current detector capable of detecting one of the battery unit charging current values and a voltage detector capable of detecting one of the battery unit charging voltage values. The charging monitoring device for a series battery pack according to 2, 3 or 4, wherein each of the energy storage state data includes a charging current value of one of the battery cells or a charging voltage value of one of the battery cells, each of The detection units each have a current detector that detects one of the battery unit charging current values or a voltage detector that detects one of the battery unit charging voltage values. The charging monitoring device for a series battery pack according to 2, 3 or 4, wherein the charging monitoring device has an electrical connection to each of the monitoring modules and is set with normal charging data of each of the batteries for each of the judging units Obtain one of the main control units for the normal charging data of the battery. The charging monitoring device for a series battery pack according to claim 7, wherein the charging monitoring device has a plurality of electrical connections between one of the battery cells and the main control unit respectively, and the one of the battery cells is isolated when the one of the battery cells is burnt out. Isolation unit of the main control unit. The charging monitoring device for a series battery pack according to claim 7, wherein the charging monitoring device has an electrical connection to each of the battery cells and the main control unit so as to avoid the main control unit and to be connected to any of the battery cells. Isolation unit that isolates the main control unit when burned. The charging monitoring device for a series battery pack according to claim 7, wherein the main control unit is a single-chip microprocessor.