CN210347876U - Battery cell charging and discharging information detection device - Google Patents
Battery cell charging and discharging information detection device Download PDFInfo
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- CN210347876U CN210347876U CN201920823833.6U CN201920823833U CN210347876U CN 210347876 U CN210347876 U CN 210347876U CN 201920823833 U CN201920823833 U CN 201920823833U CN 210347876 U CN210347876 U CN 210347876U
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Abstract
The application relates to a battery cell charging and discharging information detection device, which comprises a charging and discharging equipment detection unit and a main control unit, wherein the charging and discharging equipment detection unit outputs an access signal to the main control unit when a battery cell is connected with the charging and discharging equipment, and outputs a take-out signal to the main control unit when the battery cell is not connected with the charging and discharging equipment; the main control unit obtains the information that the battery cell is in a charging and discharging state according to the access signal and obtains the information that the battery cell is in a non-charging and discharging state according to the taking-out signal; the charging and discharging equipment detection unit is connected with the main control unit, the charging and discharging anode and the charging and discharging cathode, wherein the charging and discharging anode is an electrode used for connecting the anode of the battery cell and one end of the charging and discharging equipment, and the charging and discharging cathode is an electrode used for connecting the cathode of the battery cell and the other end of the charging and discharging equipment. By the adoption of the method and the device, the connection state of the battery cell and the charging and discharging equipment can be detected.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a battery cell charging and discharging information detection device.
Background
In order to ensure the normal operation of the battery cell, generally, charge and discharge management needs to be performed on the battery cell, and the charge and discharge management needs to be performed on the battery cell, so that relevant information of the battery cell in the charge and discharge process needs to be detected. At present, the voltage, the current and the temperature in the charging and discharging process of a battery cell are mainly detected, and the connection state of the battery cell and external equipment cannot be detected.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a battery cell charge/discharge information detection apparatus that can detect a connection state between a battery cell and an external device.
A battery cell charging and discharging information detection device comprises:
the charging and discharging equipment detection unit outputs an access signal to the main control unit when the battery cell is connected with the charging and discharging equipment, and outputs a take-out signal to the main control unit when the battery cell is not connected with the charging and discharging equipment;
the main control unit is used for obtaining the information that the battery cell is in a charging and discharging state according to the access signal and obtaining the information that the battery cell is in a non-charging and discharging state according to the taking-out signal;
the charging and discharging equipment detection unit is connected with the main control unit, a charging and discharging anode and a charging and discharging cathode, wherein the charging and discharging anode is used for connecting the anode of the battery cell with an electrode at one end of the charging and discharging equipment, and the charging and discharging cathode is used for connecting the cathode of the battery cell with an electrode at the other end of the charging and discharging equipment.
According to the battery cell charging and discharging information detection device, the connection state of the battery cell and the charging and discharging equipment is detected through the charging and discharging equipment detection unit, the access signal or the taking-out signal is sent to the main control unit according to the detection result, the main control unit obtains the information that the battery cell is in the charging and discharging state according to the access signal, and obtains the information that the battery cell is in the non-charging and discharging state according to the taking-out signal, so that the detection of the connection state of the battery cell and the charging and discharging.
In one embodiment, the access signal includes a charging access signal and a discharging access signal, and the charging and discharging device detecting unit includes: the charger detection circuit outputs a charging access signal to the main control unit when the battery cell is connected with the charger and outputs a charging take-out signal to the main control unit when the battery cell is not connected with the charger; the load detection circuit outputs a discharge access signal to the main control unit when the battery cell is connected with a load, and outputs a discharge take-out signal to the main control unit when the battery cell is not connected with the load; the charger detection circuit is connected with the charge-discharge anode, the charge-discharge cathode and the main control unit, and the load detection circuit is connected with the cathode of the battery cell, the charge-discharge cathode and the main control unit.
In one embodiment, the charger detection circuit comprises a switch tube Q54, a switch tube U20, a switch tube Q63, a switch tube Q64, a resistor R160, a resistor R262, a resistor R265, a resistor R266 and a resistor R268; the control end of the switching tube Q54 is connected with the main control unit, the input end of the switching tube Q54 is connected with the control output end of the switching tube U20, and the output end of the switching tube Q54 is connected with the cathode of the battery cell; the control input end of the switch tube U20 is connected with the first power supply input end, the controlled input end of the switch tube U20 is connected with the charge-discharge anode through the resistor R262 and the resistor R266 in sequence, and the controlled output end of the switch tube U20 is connected with the charge-discharge cathode; the common end of the resistor R262 and the resistor R266 is connected with the control end of the switch tube Q63, the input end of the switch tube Q63 is connected with the charging and discharging anode through the resistor R160, the output end of the switch tube Q63 is connected with the control end of the switch tube Q64 through the resistor R265, the output end of the switch tube Q64 is connected with the cathode of the battery cell, the input end of the switch tube Q64 is connected with the second power supply input end through the resistor R268, and the common end serving as a charging detection point is connected with the main control unit; when the main control unit starts to detect whether the battery core is connected with the charger, the main control unit sends a high level to the control end of the switching tube Q54, the level of a charging detection point is detected, a charging access signal is a detected low level, and a charging taking-out signal is a detected high level.
In one embodiment, the load detection circuit comprises a resistor R136, a resistor R137, a resistor R269 and a switch tube Q65; the resistor R13 and the resistor R137 are connected in series, the common end of the resistor R13 is connected with the control end of the switch tube Q65, the other end of the resistor R136 after series connection is connected with the negative electrode of the battery cell, and the other end of the resistor R137 after series connection is connected with the charge and discharge negative electrode; the output end of the switch tube Q65 is connected with the cathode of the battery core, the input end of the switch tube Q65 is connected with the second power supply input end through a resistor R269, and the common end is used as a discharge detection point and connected with the main control unit; the main control unit detects the level of a discharge detection point, a discharge access signal is a detected low level, and a discharge extraction signal is a detected high level.
In one embodiment, the device further comprises a voltage sampling circuit, a current sampling resistor and a front end monitoring unit; the voltage sampling circuit is connected with the anode of the battery cell, the cathode of the battery cell and the front end monitoring unit, the current sampling resistor is connected between the cathode of the battery cell and the charging and discharging equipment in series, the front end monitoring unit is connected with the two ends of the current sampling resistor, and the front end monitoring unit is connected with the main control unit.
In one embodiment, the number of the battery cells is multiple, and the battery cells are sequentially connected in series to form a battery string, the battery cell charging and discharging information detection device further comprises an equalization circuit equal to the number of the battery cells, and the equalization circuit comprises an input end, an output end and a control end; the input end of the equalizing circuit is connected with the anode of the corresponding battery cell, the output end of the equalizing circuit is connected with the cathode of the corresponding battery cell, and the control end of the equalizing circuit is connected with the front-end monitoring unit.
In one embodiment, the equalizing circuit includes an equalizing switch tube, a diode, a first resistor and a second resistor, an input end of the equalizing switch tube is connected to an anode of the corresponding battery cell, an output end of the equalizing switch tube is connected to a cathode of the corresponding battery cell through the first resistor, a control end of the equalizing switch tube is connected to a common end of the anode of the corresponding battery cell and the front end monitoring unit through the diode, and the control end of the equalizing switch tube is connected to the front end monitoring unit through the second resistor.
In one embodiment, the battery further comprises a temperature sensor, wherein the temperature sensor is connected with the front end monitoring unit and is arranged in an environment where the battery cell is placed.
In one embodiment, the number of the battery cells is multiple, and the battery cells are sequentially connected in series to form a battery string, the front-end monitoring unit comprises a first front-end acquisition chip and a second front-end acquisition chip, the voltage sampling circuit is connected with the first front-end acquisition chip and the second front-end acquisition chip, two ends of the current sampling resistor are connected with the first front-end acquisition chip, and the first front-end acquisition chip and the second front-end acquisition chip are connected with the main control unit.
In one embodiment, the system further comprises an isolation circuit, and the second front-end acquisition chip is connected with the main control unit through the isolation circuit.
Drawings
Fig. 1 is a block diagram illustrating a structure of a device for detecting battery cell charge/discharge information according to an embodiment;
FIG. 2 is a circuit schematic of a charger detection circuit in one embodiment;
FIG. 3 is a circuit schematic of a load detection circuit in one embodiment;
fig. 4 is a block diagram of a structure of a battery cell charge and discharge information detection apparatus in another embodiment;
fig. 5 is a block diagram illustrating a structure of a cell charge/discharge information detection apparatus according to still another embodiment;
FIG. 6 is a circuit diagram of a first front-end acquisition chip in one embodiment;
FIG. 7 is a circuit diagram of a second front-end acquisition chip in one embodiment;
FIG. 8 is a circuit schematic of a low side sampling circuit and an equalization circuit in one embodiment;
FIG. 9 is a circuit diagram of peripheral circuitry connected to a first front-end acquisition chip in one embodiment;
FIG. 10 is a circuit schematic of a high side sampling circuit and an equalization circuit in one embodiment;
FIG. 11 is a circuit diagram of peripheral circuitry coupled to a second front-end acquisition chip in one embodiment;
FIG. 12 is a circuit schematic of a first isolation subcircuit in one embodiment;
FIG. 13 is a circuit schematic of a second isolation sub-circuit in one embodiment;
FIG. 14 is a circuit schematic of a third isolated sub-circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a battery cell charging and discharging information detection device. Referring to fig. 1, the cell charge and discharge information detection apparatus includes a charge and discharge device detection unit 11 and a main control unit 12; the charging and discharging equipment detection unit 11 is connected with the main control unit 12, a charging and discharging anode P + and a charging and discharging cathode P-, wherein the charging and discharging anode P + is an electrode for connecting the anode of the battery cell 20 and one end of the charging and discharging equipment, and the charging and discharging cathode P-is an electrode for connecting the cathode of the battery cell 20 and the other end of the charging and discharging equipment.
The charging and discharging device detection unit 11 is configured to detect a connection state between the battery cell 20 and the charging and discharging device. The charging and discharging equipment detection unit 11 outputs an access signal to the main control unit 12 when the battery cell 20 is connected with the charging and discharging equipment, and outputs a take-out signal to the main control unit 12 when the battery cell 20 is not connected with the charging and discharging equipment; the main control unit 12 obtains information that the battery cell 20 is in a charge-discharge state according to the access signal, and obtains information that the battery cell 20 is in a non-charge-discharge state according to the take-out signal.
The charging and discharging device includes a device connected when the battery cell 20 is charged and a device connected when the battery cell 20 is discharged. In particular, the access signal and the fetch signal may be signals represented by levels, for example, the access signal may be low level, and correspondingly, the fetch signal may be high level; or the access signal may be high and correspondingly the take-off signal may be low.
The main control unit 12 obtains information that the battery cell 20 is in the charge-discharge state or the non-charge-discharge state, and specifically may generate an indication message for indicating that the battery cell 20 is in the charge-discharge state according to the access signal, and generate an indication message for indicating that the battery cell 20 is in the non-charge-discharge state according to the take-out signal. For example, the main control unit 12 may send an indication message to an external device such as a display screen, so that the external device acquires information about whether the battery cell 20 is in a charge-discharge state. It can be understood that the main control unit 12 obtains the information that the battery cell 20 is in the charge-discharge state or the non-charge-discharge state, and it may not be necessary to generate an indication message for transmission, for example, when the main control unit 12 receives the access signal, it indicates that the battery cell 20 is in the charge-discharge state, at this time, the main control unit 12 may perform the control operation when the battery cell 20 is in the charge-discharge state, when the main control unit 12 receives the take-out signal, it indicates that the battery cell 20 is in the non-charge-discharge state, at this time, the main control unit 12 may perform the.
According to the battery cell charging and discharging information detection device, the connection state of the battery cell 20 and the charging and discharging equipment is detected through the charging and discharging equipment detection unit 11, an access signal or a take-out signal is sent to the main control unit 12 according to a detection result, the main control unit 12 obtains information that the battery cell 20 is in a charging and discharging state according to the access signal, and obtains information that the battery cell 20 is in a non-charging and discharging state according to the take-out signal, so that the connection state of the battery cell 20 and the charging and discharging equipment can be detected.
In one embodiment, the access signal comprises a charge access signal and a discharge access signal, and the take-out signal comprises a charge take-out signal and a discharge take-out signal; the charge and discharge device includes a charger connected when the battery cell 20 is charged and a load connected when the battery cell 20 is discharged. Specifically, when the charger is used for charging, the positive electrode of the battery cell 20 is connected to one end of the positive electrode of the charger through a charging/discharging positive electrode P +, and the negative electrode of the battery cell 20 is connected to one end of the negative electrode of the charger through a charging/discharging negative electrode P-; when a load is used for discharging, the positive electrode of the battery cell 20 is connected to one end of the load through the charging and discharging positive electrode P +, and the negative electrode of the battery cell 20 is connected to the other end of the load through the charging and discharging negative electrode P-.
The charging and discharging equipment detection unit 11 includes a charger detection circuit and a load detection circuit; the charger detection circuit is connected with the charge-discharge anode P +, the charge-discharge cathode P-and the main control unit 12, and the load detection circuit is connected with the charge-discharge cathode P-, the cathode of the battery cell 20 and the main control unit 12. The charger detection circuit outputs a charging access signal to the main control unit 12 when the battery cell 20 is connected with a charger, and outputs a charging take-out signal to the main control unit 12 when the battery cell 20 is not connected with the charger; correspondingly, the main control unit 12 obtains the information that the battery cell 20 is in the charging state according to the charging access signal, and obtains the information that the battery cell 20 is in the non-charging state according to the charging take-out signal. The load detection circuit outputs a discharge access signal to the main control unit 12 when the battery cell 20 is connected with a load, and outputs a discharge take-out signal to the main control unit 12 when the battery cell 20 is not connected with the load; correspondingly, the main control unit 12 obtains the information that the battery cell 20 is in the discharging state according to the discharging access signal, and obtains the information that the battery cell 20 is in the non-discharging state according to the discharging take-out signal.
The voltage difference between the charging/discharging positive electrode P + and the charging/discharging negative electrode P-is generally affected by whether the charging device is connected, for example, the voltage difference between the charging/discharging positive electrode P + and the charging/discharging negative electrode P-is generally different in two different states of the battery cell 20 connected to the charging device and not connected to the charging device. The voltage difference between the charging/discharging negative electrode P "and the negative electrode of the battery cell 20 is generally affected by whether the load is connected, for example, the voltage difference between the charging/discharging negative electrode P" and the negative electrode of the battery cell 20 is generally different in two different states of the battery cell 20 connected with the load and not connected with the load. Specifically, the charger detection circuit compares the voltages of the charge and discharge anode P + and the charge and discharge cathode P-, and outputs a charge access signal or a charge extraction signal according to the comparison result; the load detection circuit compares the voltage of the charge and discharge cathode P-with the voltage of the cathode of the battery cell 20, and outputs a discharge access signal and a discharge take-out signal according to the comparison result. Through adopting the access and taking out of charger detection circuitry detection charger to whether detection electricity core 20 is in the charged state, adopt the access and taking out of load detection circuitry detection load, thereby whether detection electricity core 20 is in the discharge state, so, can detect respectively the state of whether connecting electricity core 20 to charger and load, detection effect is good.
In one embodiment, referring to fig. 2, the charger detection circuit includes a switch Q54, a switch U20, a switch Q63, a switch Q64, a resistor R160, a resistor R262, a resistor R265, a resistor R266, and a resistor R268. The control end of the switch tube Q54 is connected with the main control unit 12, the input end of the switch tube Q54 is connected with the control output end of the switch tube U20, and the output end of the switch tube Q54 is connected with the cathode B-of the battery cell 20. The control input end of the switch tube U20 is connected with the first power input end VCC, the controlled input end of the switch tube U20 is connected with the charge-discharge anode P + sequentially through the resistor R262 and the resistor R266, namely is connected with the anode B + of the battery cell 20, and the controlled output end of the switch tube U20 is connected with the charge-discharge cathode P-.
The common end of the resistor R262 and the resistor R266 is connected with the control end of the switch tube Q63, the input end of the switch tube Q63 is connected with the charge-discharge anode through the resistor R160, and the output end of the switch tube Q63 is connected with the control end of the switch tube Q64 through the resistor R265. The output end of the switching tube Q64 is connected to the negative electrode of the battery cell 20, the input end of the switching tube Q64 is connected to the second power input end PWR3 through the resistor R268, and the common end is used as a charging detection point and connected to the main control unit 12. IN fig. 2, the charging detection point is specifically connected to the main control unit 12 through the port CHG _ IN.
When the main control unit 12 starts to detect whether the battery cell 20 is connected to the charger, it sends a high level to the control end of the switching tube Q54, and detects the level of the charging detection point, where the charging access signal is a detected low level, and the charging take-out signal is a detected high level. Specifically, the main control unit 12 may use detection of a set trigger event as a starting condition for detecting whether the battery cell 20 is connected to a charger.
The main control unit 12 outputs a high level to the control end of the switching tube Q54, so that the switching tube U20 is turned on; when the charger is connected, that is, the charger is connected with the positive electrode of the battery cell 20 through the charge and discharge positive electrode P + and connected with the negative electrode of the battery cell 20 through the charge and discharge negative electrode P-, and the battery cell 20 is charged, then the voltage obtained by subtracting the voltage of the charge and discharge negative electrode P-from the voltage of the charge and discharge positive electrode P + (that is, B +) is greater than a preset threshold value, after the resistor R160, the resistor R266 and the resistor R262 are processed, the switching tube Q63 is conducted, and then the switching tube Q64 is conducted through the resistor R265, so that the port CHG _ IN becomes a; the main control unit 12 detects that the port CHG _ IN is low, i.e. it indicates that the charging access signal is received. When the charger is pulled out, the voltage obtained by subtracting the voltage of the charge and discharge cathode P & lt- & gt from the voltage of the charge and discharge anode P & lt + & gt (namely B & lt + & gt) is smaller than a preset threshold value, and the CHG _ IN is changed into a high level; the main control unit 12 detects that the port CHG _ IN is at a high level, i.e., it indicates that the charge extracting signal is received. Therefore, the charger detection circuit can detect the access/taking-out of the charger in real time, and the detection accuracy is high.
In an embodiment, the charger detection circuit may further include a resistor R150 and a resistor R148, and the control terminal of the switching tube Q54 is connected to the main control unit 12 through the resistor R150, as shown in fig. 2, the resistor R150 is specifically connected to the main control unit 12 through the port CHG _ DET; the control input terminal of the switching tube U20 is connected to the first power input terminal VCC through a resistor R148. The resistor R150 can protect the operation of the switch tube Q54, and the resistor R148 can protect the operation of the switch tube U20. Further, the switching tube Q54, the switching tube Q63 and the switching tube Q64 may be triodes, and the switching tube U20 may be an optocoupler.
In one embodiment, referring to fig. 3, the load detection circuit includes a resistor R136, a resistor R137, a resistor R269, and a switch Q65; the resistor R13 and the resistor R137 are connected in series, the common end of the resistor R13 is connected with the control end of the switch tube Q65, the other end of the resistor R136 is connected with the negative electrode of the battery cell 20 after series connection, and the other end of the resistor R137 after series connection is connected with the charge-discharge negative electrode P-; the output end of the switching tube Q65 is connected with the negative electrode of the battery cell 20; the input terminal of the switch Q65 is connected to the second power input terminal PWR3 through a resistor R269, and the common terminal is connected to the main control unit 12 as a discharge detection point. As shown in fig. 3, the discharging detection point is specifically connected to the main control unit 12 through the port LOAD _ DET.
The main control unit 12 detects the level of the discharge detection point, the discharge access signal is the detected low level, and the discharge take-out signal is the detected high level. Specifically, when the LOAD is connected, the voltage obtained by subtracting the voltage of the negative electrode B-of the battery cell 20 from the voltage of the charging/discharging negative electrode P-is greater than a preset threshold value, so that the switching tube Q65 is turned on, and the port LOAD _ DET is changed to a low level; the main control unit 12 detects that the port LOAD _ DET is low, i.e. it indicates that a discharging access signal is received. When the LOAD is pulled out, the voltage obtained by subtracting the voltage of the negative electrode B-of the battery cell 20 from the voltage of the charging and discharging negative electrode P-is smaller than a preset threshold value, the switching tube Q65 is cut off, and the port LOAD _ DET is changed into a high level; the main control unit 12 detects that the port LOAD _ DET is high, which means that the discharge extraction signal is received. Therefore, the load detection circuit can detect the access/extraction of the load in real time, and the detection accuracy is high. Specifically, the switching tube Q65 may be a triode.
In one embodiment, the battery cell charging and discharging information detection apparatus further includes a voltage sampling circuit, a current sampling resistor (refer to fig. 4), and a front end monitoring unit (refer to fig. 4); the voltage sampling circuit is connected with the anode of the battery cell 20, the cathode of the battery cell 20 and the front end monitoring unit, the current sampling resistor is connected between the cathode of the battery cell 20 and the charging and discharging device in series, the front end monitoring unit is connected with the two ends of the current sampling resistor, and the front end monitoring unit is connected with the main control unit 12. The current sampling resistor may be connected in series between the negative electrode B-of the battery cell 20 and the charge/discharge negative electrode P-.
Specifically, the voltage sampling circuit is configured to sample a voltage of the battery cell 20 and output a sampling signal to the front end monitoring unit, and the front end monitoring unit receives the sampling signal to obtain a voltage corresponding to the battery cell 20. The current sampling resistor is used for current sampling, and the front-end monitoring unit is connected with two ends of the current sampling resistor and acquires current of a loop where the battery cell 20 is located. Specifically, the front end monitoring unit may communicate with the main control unit 12, the main control unit 12 reads the voltage and the current collected by the front end monitoring unit, and the main control unit 12 may perform charge and discharge management according to the voltage and the current. Therefore, by adopting the voltage sampling circuit, the current sampling resistor and the front end monitoring unit, the voltage acquisition and the current acquisition of the battery cell 20 can be further realized, and the auxiliary main control unit 12 realizes the voltage detection and the current detection.
In an embodiment, there may be a plurality of current sampling resistors, the current sampling resistors are connected in parallel and then connected in series between the battery cell 20 and the charging and discharging device, and both ends of the parallel current sampling resistors are respectively connected to the front end monitoring unit.
In one embodiment, the number of the battery cells 20 is plural and the battery cells are connected in series to form a battery string. Referring to fig. 5 to 7, the front end monitoring unit includes a first front end acquisition chip U1 and a second front end acquisition chip U11, the voltage sampling circuit is connected to the first front end acquisition chip U1 and the second front end acquisition chip U11, the two ends of the current sampling resistor are connected to the first front end acquisition chip U1, and the first front end acquisition chip U1 and the second front end acquisition chip U11 are connected to the main control unit 12.
Specifically, in fig. 6, the first front-end acquisition chip U1 is connected to the current sampling resistor through the port SRP and the port SRN, and the first front-end acquisition chip U1 is connected to the main control unit 12 through the port ALERT _ MCU, the port MCU _ SDA2, and the port MCU _ SCL 2. The first front-end acquisition chip U1 acquires the voltage of a part of cells, and the second front-end acquisition chip U11 acquires the voltage of another part of cells. For a battery string composed of a plurality of battery cells 20, the number of the battery cells needing voltage detection is possibly large, the voltage of the battery cells is respectively collected by adopting two front-end collecting chips, the voltage collecting requirements of a large number of battery cells can be met, the use is convenient, and the compatibility is good. Specifically, the first Front-End acquisition chip and the second Front-End acquisition chip may be AFE (Analog Front End) chips.
In one embodiment, the voltage sampling circuit may include a low side sampling circuit connected to the first front-end acquisition chip U1 and to the positive and negative electrodes of the plurality of cells connected in series from the negative electrode of the battery string, and a high side sampling circuit connected to the second front-end acquisition chip U11 and to the positive and negative electrodes of the plurality of cells connected in series from the positive electrode of the battery string, as shown in fig. 5. For example, the low-side sampling circuit samples the cell voltages of the 9-15 strings at the low side of the battery string, and the first front-end acquisition chip U1 acquires the cell voltages of the 9-15 strings at the low side of the battery string; the high-side sampling circuit acquires the cell voltages of 6 strings to 10 strings of the high side of the battery string, and the second front-end acquisition chip U11 acquires the cell voltages of 6 strings to 10 strings of the high side of the battery string, so that the cell charge and discharge information detection device can monitor the cell voltages of 9 strings to 25 strings.
Specifically, referring to fig. 8, the connection sequence of the low-side sampling circuit connecting the cells is sequentially from the port C0 to the port C15, and correspondingly, the pins 41 to 24, the pin 10 and the pin 15 of the first front-end acquisition chip U1 in fig. 6 are connected through the port VC0 to the port VC15, respectively. The low side sampling circuit comprises a plurality of low side sampling sub-circuits and low side auxiliary sub-circuits, wherein the low side auxiliary sub-circuits comprise a resistor R2 connected to a port C0, a resistor R88, a capacitor C26 connected to the resistor R2 and the resistor R88, a resistor R65 connected to a port C5, a resistor R63, a capacitor C20 connected to the resistor R65 and the resistor R63, and a resistor R167 connected to the port C10, a resistor R182, and a capacitor C85 connected to the resistor R167 and the resistor R182; the first low side sampling sub-circuit comprises a resistor R6 and a capacitor C19; the second low side sampling sub-circuit comprises a resistor R9 and a capacitor C7; the third low side sampling sub-circuit comprises a resistor R13 and a capacitor C6; the fourth low side sampling sub-circuit comprises a resistor R19 and a capacitor C3; the fifth low side sampling sub-circuit comprises a resistor R184 and a capacitor C2; the sixth low side sampling sub-circuit comprises a resistor R62 and a capacitor C17; the seventh low side sampling sub-circuit comprises a resistor R30 and a capacitor C15; the eighth low side sampling sub-circuit comprises a resistor R33 and a capacitor C10; the ninth low side sampling sub-circuit comprises a resistor R42 and a capacitor C23; the tenth low side sampling sub-circuit comprises a resistor R185 and a capacitor C25; the eleventh low side sampling sub-circuit comprises a resistor R169 and a capacitor C84; the twelfth low side sampling sub-circuit comprises a resistor R172 and a capacitor C72; the thirteenth low side sampling sub-circuit comprises a resistor R175 and a capacitor C83; the fourteenth low side sampling sub-circuit comprises a resistor R178 and a capacitor C60; the fifteenth low-side sampling sub-circuit includes a resistor R181 and a capacitor C59.
Correspondingly, as shown in fig. 6, the first front-end capture chip U1 is further connected to the circuit shown in fig. 9 through the peripheral circuit connection port C15 shown in fig. 9, specifically through the pins 20, 10 and 9, and further connected to the port C15. Taking the 1 st cell as an example: the negative electrode of the 1 st electrical core is connected to the port C0, the positive electrode of the 1 st electrical core is connected to the port C1, the voltage is filtered by the resistor R6, the resistor R88 and the capacitor C19 and then input to the pin 40 and the pin 41 of the first front-end acquisition chip U1, and the ADC in the first front-end acquisition chip U1 acquires the voltage in real time, so that the voltage of the 1 st electrical core can be obtained; the voltage collection principle of the remaining 24 strings of electric cores is the same, and the detailed description is omitted here.
Referring to fig. 10, the connection sequence of the high-side sampling circuit to the battery cells is sequentially from the port C16 to the port C25, and correspondingly, the pins 27 to 16 and 10 of the second front-end acquisition chip U11 in fig. 7 are connected through the port VCB0 to the port VCB10, respectively. The high-side sampling circuit comprises a plurality of high-side sampling sub-circuits and high-side auxiliary sub-circuits, wherein the high-side auxiliary sub-circuits comprise a resistor R218 and a resistor R272 connected to a port C15, a capacitor C73 connected between the resistor R218 and the resistor R272, and a resistor R246 and a resistor R247 connected to a port C20, and a capacitor C55 connected between the resistor R246 and the resistor R247. The structure of the high-side sampling sub-circuit is similar to that of the low-side sampling sub-circuit, and details are not described herein, for example, the first high-side sampling sub-circuit includes a resistor R219 and a resistor R217. Correspondingly, as shown in fig. 7, the second front-end capture chip U11 is further connected to the circuit shown in fig. 11 via the peripheral circuit connection port C25 shown in fig. 11, specifically via the pin 15, the pin 10 and the pin 9, and further connected to the port C25.
Further, the battery cell charging and discharging information detection device further comprises an isolation circuit, and the second front-end acquisition chip U11 is connected with the main control unit 12 through the isolation circuit. By adopting the isolation circuit, the problem that the front-end acquisition chip cannot be cascaded can be solved.
The isolation circuit may include a first isolation subcircuit, a second isolation subcircuit, and a third isolation subcircuit. For example, as shown in fig. 12, the first isolation sub-circuit has a port regaut 2 connected to pin 8 of the second front-end acquisition chip U11, and a port MCU _ SDA and a port MCU _ SCL connected to the main control unit 12; as shown in fig. 13, the port TS4+ of the second isolation sub-circuit is connected to the pin 6 of the second front-end acquisition chip U11, and the port BOOT _ EN is connected to the main control unit 12. As shown in fig. 14, the port ALERT b is connected to the pin 30 of the second front-end capture chip U11, and the port ALERT2 is connected to the main control unit 12.
In an embodiment, the cell charging and discharging information detecting apparatus further includes a temperature sensor (not shown), and the temperature sensor is connected to the front end monitoring unit and disposed in an environment where the cell 20 is disposed. The temperature sensor collects temperature signals and sends the temperature signals to the front-end monitoring unit, and the front-end monitoring unit obtains temperature values according to the temperature signals. Specifically, the main control unit 12 may read the temperature value obtained by the front-end monitoring unit. Therefore, the temperature of the surrounding environment of the battery core can be detected, so that the main control unit 12 can perform corresponding analysis and judgment according to the temperature, and the information detection is more comprehensive. For example, the battery cell 20 is placed in a storage bin, and similarly, the temperature sensor is also placed in the storage bin; the main control unit 12 may control to stop charging the battery cell 20 or stop discharging the battery cell 20 when the read temperature value exceeds a preset temperature value.
For example, the temperature acquisition may acquire 5 channels, wherein the first front-end acquisition chip U1 acquires 3 channels, and referring to fig. 6, the first channel: the port TS1+ is connected to the pin 6 of the first front-end acquisition chip U1, and the port TS 1-is connected to the first front-end acquisition chip U1 after passing through the resistor R90; and a second path: the port TS2+ is connected to the pins 13 and TS 2-of the first front-end acquisition chip U1, and is connected to the pin 10 of the first front-end acquisition chip U1 after passing through the resistor R91; and a third path: the port TS3+ is connected to the pin 18 of the first front-end acquisition chip U1, and the port TS 3-is connected to the pin 15 of the first front-end acquisition chip U1 after passing through the resistor R94. The second front-end acquisition chip U11 acquires 2 channels, referring to fig. 7, the first channel: the port TS4+ is connected to the pin 6 of the second front-end acquisition chip U11, and the port TS 4-is connected to the second front-end acquisition chip U11 after passing through the resistor R95; and a second path: the port TS5+ is connected to the pin 13 of the second front-end acquisition chip U11, and the port TS 5-is connected to the pin 10 of the second front-end acquisition chip U11 after passing through the resistor R96.
In an embodiment, referring to fig. 5, the number of the battery cells is multiple, and the battery cells are sequentially connected in series to form a battery string, and the battery cell charging and discharging information detection apparatus further includes an equalizing circuit equal to the number of the battery cells, where the equalizing circuit includes an input terminal, an output terminal, and a control terminal. The input end of the equalizing circuit is connected with the anode of the corresponding battery cell, the output end of the equalizing circuit is connected with the cathode of the corresponding battery cell, and the control end of the equalizing circuit is connected with the front-end monitoring unit. Specifically, the front-end monitoring unit can output an equalization signal to the control end of the equalization circuit to control the equalization circuit to work, so that equalization between unbalanced cells is realized, and the purpose of energy equalization is realized.
In one embodiment, the equalizing circuit includes an equalizing switch tube, a diode, a first resistor, and a second resistor, an input end of the equalizing switch tube is connected to an anode of the corresponding electrical core, an output end of the equalizing switch tube is connected to a cathode of the corresponding electrical core through the first resistor, a control end of the equalizing switch tube is connected to a common end of the anode of the corresponding electrical core and the front end monitoring unit through the diode, and the control end of the equalizing switch tube is connected to the front end monitoring unit through the second resistor.
For example, referring to fig. 8, for a low-side cell, a principle description is made by taking the 1 st path of equalization circuit as an example: in the 1 st path of equalizing circuit, an equalizing switch tube is a switch tube Q34, a first resistor is a resistor R5, a second resistor is a resistor R1, and a diode is D30; the switching on and off of the switching tube Q34 are controlled by an equalizing register inside the first front-end acquisition chip U1, the switching tube Q34 is opened when an equalizing circuit is switched on, the 1 st electric core discharges to the resistor R5 to achieve the purpose of energy equalization, and the size of the discharging current is related to the resistance value of the resistor R5 and the voltage at the two ends of the 1 st electric core. It can be understood that the structures of the other equalizing circuits are the same as the structure of the equalizing circuit of the 1 st path, and refer to fig. 8 and 10, which are not described herein again.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a battery cell charge-discharge information detection device which characterized in that includes:
the charging and discharging equipment detection unit outputs an access signal to the main control unit when the battery cell is connected with the charging and discharging equipment, and outputs a take-out signal to the main control unit when the battery cell is not connected with the charging and discharging equipment;
the main control unit is used for obtaining the information that the battery cell is in a charging and discharging state according to the access signal and obtaining the information that the battery cell is in a non-charging and discharging state according to the taking-out signal;
the charging and discharging equipment detection unit is connected with the main control unit, a charging and discharging anode and a charging and discharging cathode, wherein the charging and discharging anode is used for connecting the anode of the battery cell with an electrode at one end of the charging and discharging equipment, and the charging and discharging cathode is used for connecting the cathode of the battery cell with an electrode at the other end of the charging and discharging equipment.
2. The battery cell charging and discharging information detection apparatus according to claim 1, wherein the access signal includes a charging access signal and a discharging access signal, the take-out signal includes a charging take-out signal and a discharging take-out signal, and the charging and discharging device detection unit includes:
the battery charging system comprises a battery cell, a main control unit, a charger detection circuit, a charging access signal and a charging take-out signal, wherein the battery cell is connected with the charger and the charging access signal is output to the main control unit;
the load detection circuit outputs the discharge access signal to the main control unit when the battery cell is connected with a load, and outputs the discharge take-out signal to the main control unit when the battery cell is not connected with the load;
the charger detection circuit is connected with the charge-discharge anode, the charge-discharge cathode and the main control unit, and the load detection circuit is connected with the cathode of the battery cell, the charge-discharge cathode and the main control unit.
3. The battery cell charging and discharging information detection device according to claim 2, wherein the charger detection circuit includes a switching tube Q54, a switching tube U20, a switching tube Q63, a switching tube Q64, a resistor R160, a resistor R262, a resistor R265, a resistor R266, and a resistor R268;
the control end of the switching tube Q54 is connected with the main control unit, the input end of the switching tube Q54 is connected with the control output end of the switching tube U20, and the output end of the switching tube Q54 is connected with the negative electrode of the battery cell; the control input end of the switch tube U20 is connected with a first power supply input end, the controlled input end of the switch tube U20 is connected with the charge-discharge anode through a resistor R262 and a resistor R266 in sequence, and the controlled output end of the switch tube U20 is connected with the charge-discharge cathode;
the common end of the resistor R262 and the resistor R266 is connected with the control end of the switch tube Q63, the input end of the switch tube Q63 is connected with the charge-discharge anode through a resistor R160, the output end of the switch tube Q63 is connected with the control end of the switch tube Q64 through a resistor R265, the output end of the switch tube Q64 is connected with the cathode of the battery cell, the input end of the switch tube Q64 is connected with the second power supply input end through a resistor R268, and the common end serving as a charge detection point is connected with the main control unit;
when the main control unit starts to detect whether the battery core is connected with the charger, the main control unit sends a high level to the control end of the switching tube Q54, detects the level of the charging detection point, the charging access signal is a detected low level, and the charging take-out signal is a detected high level.
4. The battery core charge-discharge information detection apparatus according to claim 2, wherein the load detection circuit includes a resistor R136, a resistor R137, a resistor R269, and a switching tube Q65;
the resistor R13 and the resistor R137 are connected in series, a common end of the resistor R13 is connected with a control end of the switch tube Q65, the other end of the resistor R136 is connected with a negative electrode of the battery cell after the resistor R13 and the control end of the resistor R65 are connected in series, and the other end of the resistor R137 is connected with the charge and discharge negative electrode after the resistor R136 and the; the output end of the switch tube Q65 is connected with the negative electrode of the battery core, the input end of the switch tube Q65 is connected with the second power supply input end through the resistor R269, and the common end is used as a discharge detection point and connected with the main control unit;
the main control unit detects the level of the discharge detection point, the discharge access signal is a detected low level, and the discharge take-out signal is a detected high level.
5. The battery cell charging and discharging information detection device according to any one of claims 1 to 4, further comprising a voltage sampling circuit, a current sampling resistor, and a front end monitoring unit;
the voltage sampling circuit is connected with the anode of the battery cell, the cathode of the battery cell and the front end monitoring unit, the current sampling resistor is connected in series between the cathode of the battery cell and the charging and discharging equipment, the two ends of the current sampling resistor are connected with the front end monitoring unit, and the front end monitoring unit is connected with the main control unit.
6. The battery cell charging and discharging information detection device according to claim 5, wherein a plurality of battery cells are sequentially connected in series to form a battery string, and the battery cell charging and discharging information detection device further comprises an equalizing circuit equal to the number of the battery cells, the equalizing circuit comprising an input terminal, an output terminal, and a control terminal;
the input end of the equalizing circuit is connected with the anode of the corresponding battery cell, the output end of the equalizing circuit is connected with the cathode of the corresponding battery cell, and the control end of the equalizing circuit is connected with the front-end monitoring unit.
7. The battery cell charging and discharging information detection device according to claim 6, wherein the equalization circuit includes an equalization switch tube, a diode, a first resistor, and a second resistor, an input end of the equalization switch tube is connected to an anode of the corresponding battery cell, an output end of the equalization switch tube is connected to a cathode of the corresponding battery cell through the first resistor, a control end of the equalization switch tube is connected to a cathode of the corresponding battery cell and a common end to which the front end monitoring unit is connected through the diode, and the control end of the equalization switch tube is connected to the front end monitoring unit through the second resistor.
8. The battery cell charging and discharging information detection device according to claim 5, further comprising a temperature sensor, wherein the temperature sensor is connected to the front end monitoring unit and disposed in an environment where the battery cell is disposed.
9. The battery cell charging and discharging information detection device according to claim 5, wherein the battery cells are multiple and serially connected in number to form a battery string, the front end monitoring unit includes a first front end acquisition chip and a second front end acquisition chip, the voltage sampling circuit is connected to the first front end acquisition chip and the second front end acquisition chip, two ends of the current sampling resistor are connected to the first front end acquisition chip, and the first front end acquisition chip and the second front end acquisition chip are connected to the main control unit.
10. The battery cell charging and discharging information detection device according to claim 9, further comprising an isolation circuit, wherein the second front-end acquisition chip is connected to the main control unit through the isolation circuit.
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| CN201920823833.6U CN210347876U (en) | 2019-06-03 | 2019-06-03 | Battery cell charging and discharging information detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146824A (en) * | 2019-06-03 | 2019-08-20 | 长沙优力电驱动系统有限公司 | Battery core charge and discharge information detector |
| CN113809807A (en) * | 2021-10-21 | 2021-12-17 | 上海先之路微电子科技有限公司 | Battery protection chip, battery charging and discharging overcurrent protection method and electronic equipment |
| CN116774092A (en) * | 2023-08-18 | 2023-09-19 | 荣耀终端有限公司 | Battery detection method, circuit, device, chip and readable storage medium |
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2019
- 2019-06-03 CN CN201920823833.6U patent/CN210347876U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146824A (en) * | 2019-06-03 | 2019-08-20 | 长沙优力电驱动系统有限公司 | Battery core charge and discharge information detector |
| CN110146824B (en) * | 2019-06-03 | 2024-07-02 | 长沙优力电驱动系统有限公司 | Battery cell charge and discharge information detection device |
| CN113809807A (en) * | 2021-10-21 | 2021-12-17 | 上海先之路微电子科技有限公司 | Battery protection chip, battery charging and discharging overcurrent protection method and electronic equipment |
| CN113809807B (en) * | 2021-10-21 | 2024-02-20 | 上海先之路微电子科技有限公司 | Battery protection chip, battery charge and discharge overcurrent protection method and electronic equipment |
| CN116774092A (en) * | 2023-08-18 | 2023-09-19 | 荣耀终端有限公司 | Battery detection method, circuit, device, chip and readable storage medium |
| CN116774092B (en) * | 2023-08-18 | 2024-04-09 | 荣耀终端有限公司 | Battery detection method, circuit, device, chip and readable storage medium |
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