CN209881459U - Battery cell equalization circuit, power supply system and vehicle - Google Patents
Battery cell equalization circuit, power supply system and vehicle Download PDFInfo
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- CN209881459U CN209881459U CN201920990791.5U CN201920990791U CN209881459U CN 209881459 U CN209881459 U CN 209881459U CN 201920990791 U CN201920990791 U CN 201920990791U CN 209881459 U CN209881459 U CN 209881459U
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Abstract
The utility model provides an electricity core equalizer circuit, electrical power generating system and vehicle. The utility model provides an electricity core equalizer circuit includes: an active equalization circuit and a compensation circuit; the active equalization circuit and the compensation circuit are both connected with a battery pack, and the battery pack comprises at least two battery cells; the active equalization circuit is used for transmitting the electric energy of a first battery cell of which the voltage in the battery pack is higher than a first threshold value to a second battery cell of which the voltage in the battery pack is lower than a second threshold value; the compensation circuit is used for carrying out charge and discharge together with the first battery cell when the charge amount of the first battery cell for active equalization exceeds a third threshold value; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, the second battery cell and the second battery cell are charged and discharged together. The utility model discloses under the pressure differential control of guaranteeing all electric cores under the within range condition of predetermined, prolonged the life of battery package.
Description
Technical Field
The utility model relates to a power technology especially relates to an electricity core equalizer circuit, electrical power generating system and vehicle.
Background
In new energy vehicles, the battery pack is the most dominant power output in the vehicle. The battery package comprises the module, and the module comprises electric core, and during the battery package charge-discharge, because there is the difference between the electric core, can lead to voltage difference between the different electric cores, serious probably causes individual electric core to overshoot or overdischarge, influences the normal use of battery package. Therefore, the battery pack needs to have a battery cell balancing function to ensure normal charging and discharging of all battery cells.
In the prior art, a cell balancing method is usually an active balancing method, that is, cell energy with high voltage is transmitted to cells with low voltage, and the voltage difference of all the cells is controlled within a predetermined range. Because the service life of the battery cell is limited, the number of times for balancing the battery cell by part of the battery cells is too large, namely, the number of times for charging and discharging is too large, the service life of the battery cell is influenced, the difference between the battery cells is increased, and the service life of the power battery pack is shortened.
Therefore, under the condition of ensuring that the differential pressure control of all the battery cells is within a predetermined range, how to prolong the service life of the battery pack is a problem to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electricity core equalizer circuit, electrical power generating system and vehicle, under the pressure differential control that guarantees all electric cores under the within range condition of predetermined, the life of extension battery package.
The utility model provides an electricity core equalizer circuit, include: an active equalization circuit and a compensation circuit;
the active equalization circuit and the compensation circuit are both connected with a battery pack, and the battery pack comprises at least two battery cells;
the active equalization circuit is used for transmitting the electric energy of a first battery cell of which the voltage in the battery pack is higher than a first threshold value to a second battery cell of which the voltage in the battery pack is lower than a second threshold value;
the compensation circuit is used for carrying out charge and discharge together with the first battery cell when the charge amount of the first battery cell for active equalization exceeds a third threshold value; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, the second battery cell and the second battery cell are charged and discharged together.
Optionally, the active equalization circuit includes: a capacitor and an inductor;
the first end of the capacitor is respectively connected with two poles of each battery cell through a switch; the second end of the capacitor is connected with the first end of the inductor, and the second end of the inductor is respectively connected with two poles of each battery cell through a switch.
Further, the active equalization circuit further comprises: a first switch, a second switch, and a third switch;
the first end of the first switch is connected with the first end of the capacitor, and the second end of the first switch is connected with the first end of the inductor;
the first end of the second switch is connected with the second end of the capacitor, and the second end of the second switch is connected with the first end of the inductor;
the first end of the third switch is connected with the second end of the capacitor, and the second end of the third switch is connected with the second end of the inductor.
Optionally, the active equalization circuit further comprises a first current sensor;
the first end of the first current sensor is connected with the first end of the capacitor, and the second end of the first current sensor is respectively connected with two poles of each battery cell through a switch;
the first current sensor is used for detecting the current output by the first battery cell through the active balancing circuit so as to obtain the charge quantity actively balanced by the first battery cell through the current; or, detecting the current received by the second battery cell through the active balancing circuit, so as to obtain the charge amount actively balanced by the second battery cell through the current.
Optionally, the compensation circuit includes: a battery and a fourth switch;
the first end of the storage battery is connected with the first end of the fourth switch, the second end of the storage battery is respectively connected with the two poles of each battery cell through the switch, and the second end of the fourth switch is respectively connected with the two poles of each battery cell through the switch.
Optionally, the compensation circuit further includes: a second current sensor;
the first end of the second current sensor is connected with the first end of the storage battery, and the second end of the second current sensor is respectively connected with two poles of each battery cell through a switch;
the second current sensor is used for detecting the current output by the storage battery so as to obtain the charge amount compensated by the storage battery for the first battery core or the second battery core through the current.
Optionally, the compensation circuit further includes: a current limiting resistor;
the current limiting resistor is connected with the storage battery in series;
and the current limiting resistor is used for preventing the overcurrent of the compensation circuit when the storage battery is charged and discharged together with the first battery cell or the second battery cell.
Optionally, the cell balancing circuit further includes: a control circuit;
the control circuit is respectively connected with the battery pack, the active equalization circuit and the compensation circuit;
the control circuit is configured to control, when the voltage of the first battery cell is higher than a first threshold and the voltage of the second battery cell is lower than a second threshold, the electric energy of the first battery cell to be transmitted to the second battery cell through the active balancing circuit;
the control circuit is further configured to control the compensation circuit and the first battery cell to perform charge and discharge together when the charge amount of the first battery cell performing active equalization exceeds a third threshold; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, controlling the compensation circuit and the second battery cell to be charged and discharged together.
The utility model provides a power supply system, which comprises a battery pack and a battery cell equalizing circuit; the battery pack is connected with the battery cell balancing circuit;
the battery cell balancing circuit is used for balancing the voltages of the two battery cells when the voltage difference between the two battery cells is greater than a fourth threshold value in the battery pack; the cell balancing circuit is any one of the cell balancing circuits described above.
The utility model provides a vehicle, which is characterized in that the vehicle comprises a vehicle body and the power supply system; the power supply system is provided in the vehicle body;
the power supply system is used for supplying power for the operation of the vehicle.
The utility model provides an electric core equalizing circuit, a power supply system and a vehicle, wherein the electric core equalizing circuit comprises an active equalizing circuit and a compensating circuit; the active equalization circuit and the compensation circuit are both connected with a battery pack, and the battery pack comprises at least two battery cells; the active equalization circuit is used for transmitting the electric energy of a first electric core with the voltage higher than a first threshold value in the battery pack to a second electric core with the voltage lower than a second threshold value in the battery pack; and the compensation circuit is used for carrying out charge and discharge together with the first battery cell when the charge amount actively balanced by the first battery cell exceeds a third threshold value, or carrying out charge and discharge together with the second battery cell when the charge amount actively balanced by the second battery cell exceeds the third threshold value. This electric core equalizer circuit balances the voltage between the electric core through initiative equalizer circuit, makes the voltage difference value between the electric core can keep within predetermined scope, still simultaneously through compensating circuit with carry out the common charge-discharge of the too much electric core of initiative equilibrium and compensate the charge-discharge consumption of carrying out the too much electric core of initiative to reduce the difference between the different electric cores in the battery package, prolonged the life of battery package.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a cell balancing circuit according to the present invention;
fig. 2 is a schematic structural diagram of a cell balancing circuit according to the present invention;
fig. 3 is a schematic structural diagram of a cell balancing circuit according to the present invention;
fig. 4 is a schematic structural diagram of a power supply system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is the utility model provides a pair of electric core equalizer circuit's structural schematic diagram one. As shown in fig. 1, the cell balancing circuit 10 of the present embodiment includes: an active equalization circuit 101 and a compensation circuit 102.
The active equalization circuit 101 and the compensation circuit 102 are both connected to a battery pack 103, and the battery pack 103 includes at least two battery cells.
The active equalization circuit 101 is configured to transmit electric energy of a first cell of the battery pack 103 with a voltage higher than a first threshold to a second cell of the battery pack 103 with a voltage lower than a second threshold.
The compensation circuit 102 is configured to charge and discharge with the first battery cell when the charge amount of the first battery cell actively balanced exceeds a third threshold; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, the second battery cell and the second battery cell are charged and discharged together.
In this embodiment, the battery pack 103 includes at least two battery cells, the first battery cell may be any battery cell of the battery pack 103 whose voltage is higher than a first threshold, and the second battery cell may be any battery cell of the battery pack 103 whose voltage is lower than a second threshold. The first threshold value and the second threshold value are set according to the specific situation of the battery pack.
Due to differences among the battery cells, voltages of different battery cells in the battery pack 103 are different, and the battery cells with too high voltage or too low voltage can be determined by detecting the voltages of the battery cells, that is, the first battery cell or the second battery cell is determined, and in order to achieve voltage balance among the battery cells, electric energy of the first battery cell is transmitted to the second battery cell through the active balancing circuit 101. Specifically, an energy storage element may be disposed in the active equalization circuit 101, and the first battery cell transmits the electric energy to the energy storage element, and then the energy storage element transmits the electric energy to the second battery cell. The active equalization among the battery cells is realized through the process, so that the pressure difference among the battery cells can be kept within a preset range, and the normal work of the battery pack is ensured.
However, if the first battery cell and the second battery cell perform the active equalization process for multiple times, that is, the number of times of charging and discharging the first battery cell and the second battery cell is too large, the service lives of the first battery cell and the second battery cell may be affected, and the difference between the first battery cell and the second battery cell and other battery cells in the battery pack 103 is increased. Therefore, the compensation circuit 102 is added in the cell balancing circuit, and after the active balancing process is finished, the compensation circuit 102 and the first cell or the second cell are charged and discharged together, so as to compensate for charge and discharge consumption in the active balancing process of the first cell or the second cell.
Specifically, if the charge amount of a certain battery cell in the battery pack 103 for active equalization exceeds a third threshold, that is, the number of times of active equalization performed by the battery cell is too many, the battery cell needs to be compensated, where the third threshold is set according to the specific situation of the battery pack. In this embodiment, if the charge amount of the first electrical core for active equalization exceeds the third threshold, after the active equalization is completed, the compensation circuit 102 and the first electrical core perform charge and discharge together in the subsequent charge and discharge processes, so that the charge and discharge consumption of the first electrical core is reduced, and the difference between the first electrical core and other electrical cores in the battery pack 103 is reduced.
Similarly, if the charge amount of the second battery cell for active equalization exceeds the third threshold, the compensation circuit 102 and the first battery cell are charged and discharged together in the subsequent charging and discharging processes after the active equalization is completed, so that the charging and discharging consumption of the first battery cell is reduced, and the difference between the first battery cell and other battery cells in the battery pack 103 is reduced.
The cell equalization circuit provided by the embodiment comprises an active equalization circuit and a compensation circuit; the active equalization circuit and the compensation circuit are both connected with a battery pack, and the battery pack comprises at least two battery cells; the active equalization circuit is used for transmitting the electric energy of a first electric core with the voltage higher than a first threshold value in the battery pack to a second electric core with the voltage lower than a second threshold value in the battery pack; and the compensation circuit is used for carrying out charge and discharge together with the first battery cell when the charge amount actively balanced by the first battery cell exceeds a third threshold value, or carrying out charge and discharge together with the second battery cell when the charge amount actively balanced by the second battery cell exceeds the third threshold value. This electric core equalizer circuit balances the voltage between the electric core through initiative equalizer circuit, makes the voltage difference value between the electric core can keep within predetermined scope, still simultaneously through compensating circuit with carry out the common charge-discharge of the too much electric core of initiative equilibrium and compensate the charge-discharge consumption of carrying out the too much electric core of initiative to reduce the difference between the different electric cores in the battery package, prolonged the life of battery package.
On the basis of the above embodiments, a cell balancing circuit is further exemplified by combining a specific circuit diagram. Fig. 2 is the utility model provides a pair of electric core equalizer circuit's structural schematic diagram two. As shown in fig. 2, based on the embodiment shown in fig. 1, the active equalization circuit 101 may include: a capacitor C and an inductor L.
The first end of the capacitor C is respectively connected with two poles of each battery cell through a switch; and the second end of the capacitor C is connected with the first end of the inductor L, and the second end of the inductor L is respectively connected with the two poles of each battery cell through the switch.
In this embodiment, the energy storage elements in the active equalization circuit 101 are a capacitor C and an inductor L, the first end of the capacitor C is connected to the two poles of each battery cell respectively, and the second end of the inductor L is connected to the two poles of each battery cell respectively.
When the active equalization of the battery cells needs to be performed, a switch connecting a first end of a capacitor C with a positive electrode of a first battery cell and a switch connecting a second end of an inductor L with a negative electrode of the first battery cell are closed, the first battery cell transmits electric energy to the capacitor C and the inductor L, after the electric energy transmission from the first battery cell to the capacitor C and the inductor L is completed, the switch connecting the first end of the capacitor C with the positive electrode of the first battery cell and the switch connecting the second end of the inductor L with the negative electrode of the first battery cell are disconnected, then the switch connecting the first end of the capacitor C with the positive electrode of the second battery cell and the switch connecting the second end of the inductor L with the negative electrode of the second battery cell are closed, the capacitor C and the inductor L transmit electric energy to the second battery cell, after the electric energy transmission from the capacitor C and the inductor L to the second battery cell is completed, the switch connecting the first end of the capacitor C with the positive electrode of the second battery cell and the switch connecting the second end of the inductor L with the negative electrode, thus realizing active equalization among the cells.
It should be noted that only one switch between the cell and the active equalization loop can be kept closed at the same time, and when the current in the active equalization loop is too large, the switch should be opened to stop the active equalization.
Further, with continued reference to fig. 2, the active equalization circuit 101 further includes: a first switch S1, a second switch S2, and a third switch S3.
A first end of the first switch S1 is connected to a first end of the capacitor C, and a second end of the first switch S1 is connected to a first end of the inductor L;
a first terminal of the second switch S2 is connected to the second terminal of the capacitor C, and a second terminal of the second switch S2 is connected to the first terminal of the inductor L;
a first terminal of the third switch S3 is connected to the second terminal of the capacitor C, and a second terminal of the third switch S3 is connected to the second terminal of the inductor L.
When the first switch S1 is closed and the second switch S2 and the third switch S3 are both open, only the inductor L participates in the active equalization of the battery cell as an energy storage element in the active equalization circuit 101; when the first switch S1 and the second switch S2 are both off and the third switch S3 is closed, only the capacitor C participates in the active equalization of the battery cell as an energy storage element in the active equalization circuit 101; when the first switch S1 is closed, the second switch S2 is opened, and the third switch S3 is closed, the capacitor C and the inductor L are connected in parallel to participate in active equalization of the battery cell as an energy storage element in the active equalization circuit 101; when the first switch S1 is turned off, the second switch S2 is turned on, and the third switch S3 is turned off, the capacitor C and the inductor L are connected in series to participate in active equalization of the battery cell as an energy storage element in the active equalization circuit 101. The first switch S1, the second switch S2, and the third switch S3 are all normally open switches, i.e., when active equalization is not performed, the first switch S1, the second switch S2, and the third switch S3 are all open states.
Further, the active equalization circuit 101 further includes a first current sensor a 1; the first end of the first current sensor A1 is connected with the first end of the capacitor C, and the second end of the first current sensor A1 is respectively connected with two poles of each battery cell through a switch.
The first current sensor a1 is configured to detect a current output by the first cell through the active balancing circuit 101, so as to obtain, through the current, an amount of charge for active balancing of the first cell; alternatively, the current received by the second cell through the active balancing circuit 101 is detected, so as to obtain the charge amount actively balanced by the second cell through the current.
In the process that the active balancing circuit 101 transmits the electric energy of the first battery cell to the second battery cell, the first current sensor a1 may detect the current when the first battery cell charges the capacitor C and/or the inductor L, so as to calculate the charge amount of the first battery cell for active balancing according to the current and the charging time; the current when the capacitor C and/or the inductor L charge the second cell can also be detected by the first current sensor a1, so that the charge amount actively equalized by the second cell is calculated according to the current and the charging time. Therefore, whether the first battery cell or the second battery cell needs to be compensated through the compensation circuit or not can be determined according to whether the charge amount actively and uniformly accumulated by the first battery cell or the charge amount actively and uniformly accumulated by the second battery cell reaches a third threshold value or not.
In the cell balancing circuit provided in this embodiment, the connection mode between the capacitor and the inductor in the active balancing circuit can be controlled by the switch, so that active balancing in four modes is provided, and in practical application, a corresponding active balancing mode can be selected as needed to achieve a better cell voltage balancing effect.
With continued reference to fig. 2, the compensation circuit 102 may include: a battery U and a fourth switch S4.
The first end of the storage battery U is connected with the first end of the fourth switch S4, the second end of the storage battery U is respectively connected with the two poles of each battery cell through the switch, and the second end of the fourth switch S4 is respectively connected with the two poles of each battery cell through the switch. The fourth switch S4 is a normally open switch, and the battery U is a battery having the same specification as the battery cell in the battery pack 103.
After the active equalization process is completed, if the battery cells need to be compensated, for example, the charge amount of the first battery cell for active equalization exceeds a third threshold, the first battery cell needs to be compensated, at this time, the fourth switch may be closed, the switch connecting the second end of the battery U with the positive electrode of the first battery cell and the switch connecting the second end of the fourth switch S4 with the negative electrode of the first battery cell are closed, then the battery U is connected in parallel with the first battery cell, the battery U and the first battery cell are charged and discharged together, so that the charge and discharge consumption of the first battery cell are reduced, the consumption of the first battery cell in the active equalization process is compensated, and after the compensation process is completed, the fourth switch S4, the switch connecting the second end of the battery U with the positive electrode of the first battery cell and the switch connecting the second end of the fourth switch S4 with the negative electrode of the first battery cell are disconnected.
Similarly, if the amount of charge actively equalized by the second battery cell exceeds the third threshold, the second battery cell needs to be compensated, at this time, the fourth switch may be turned on, the switch connecting the second end of the battery U with the positive electrode of the second battery cell and the switch connecting the second end of the fourth switch S4 with the negative electrode of the second battery cell are turned on, then the battery U is connected in parallel with the second battery cell, and the battery U and the second battery cell perform charge and discharge together, so that the charge and discharge consumption of the second battery cell is reduced, so as to compensate the consumption of the second battery cell in the active equalization process, after the compensation process is completed, the fourth switch S4, the switch connecting the second end of the battery U with the positive electrode of the second battery cell and the switch connecting the second end of the fourth switch S4 with the negative electrode of the second battery cell are turned off.
It should be noted that before the first cell or the second cell is compensated by the storage battery U, the storage battery U needs to be charged and discharged to the average cell voltage level of the battery pack 103.
Optionally, the compensation circuit 102 further includes: a second current sensor a 2; the first end of the second current sensor A2 is connected with the first end of the storage battery U, and the second end of the second current sensor A2 is respectively connected with the two poles of each battery cell through a switch.
And the second current sensor a2 is configured to detect a current output by the battery U, so as to obtain, through the current, an amount of charge compensated by the battery U for the first cell or the second cell.
In the process of performing charge and discharge compensation on the first battery cell by the compensation circuit 102, the current of the battery U during charge and discharge compensation on the first battery cell can be detected by the second current sensor a2, so as to calculate the charge amount of the battery U performing charge and discharge compensation on the first battery cell according to the current and the charge and discharge time, when the charge amount of the battery U performing charge and discharge compensation on the first battery cell is equal to the charge amount of the first battery cell performing active equalization, the fourth switch S4, the switch for connecting the second end of the battery U with the positive electrode of the first battery cell and the switch for connecting the second end of the fourth switch S4 with the negative electrode of the first battery cell can be disconnected, and the charge and discharge compensation on the first battery cell can be finished.
Similarly, in the process of performing charge and discharge compensation on the second battery cell by the compensation circuit 102, the current of the battery U during charge and discharge compensation on the second battery cell may be detected by the second current sensor a2, so as to calculate the charge amount of the battery U during charge and discharge compensation on the second battery cell according to the current and the charge and discharge time, and when the charge amount of the battery U during charge and discharge compensation on the second battery cell is equal to the charge amount of the second battery cell during active equalization, the fourth switch S4, the switch connecting the second end of the battery U with the positive electrode of the second battery cell, and the switch connecting the second end of the fourth switch S4 with the negative electrode of the second battery cell may be disconnected to end the charge and discharge compensation on the second battery cell.
Optionally, the compensation circuit 102 further includes: and a current limiting resistor R.
The current limiting resistor R is connected with the storage battery U in series; and the current-limiting resistor R is used for preventing the overcurrent of the compensation circuit 102 when the storage battery U is charged and discharged together with the first battery cell or the second battery cell.
In the cell balancing circuit provided by this embodiment, the storage battery in the compensation circuit is connected in parallel with the cell, so as to compensate for the loss of the cell due to active balancing, and reduce the difference between the cells, thereby prolonging the service life of the battery pack.
In practical applications, in order to save space, the switches used in the above embodiments may be integrated load switches.
On the basis of the embodiment shown in fig. 1 or fig. 2, the utility model also provides a cell balancing circuit. Fig. 3 is a schematic structural diagram of a cell balancing circuit according to the present invention. As shown in fig. 3, the cell balancing circuit 30 includes: an active equalization circuit 301, a compensation circuit 302, and a control circuit 304.
The active equalization circuit 301 is the active equalization circuit 101 in the embodiment shown in fig. 1 or fig. 2; the compensation circuit 302 is the compensation circuit 102 in the embodiment shown in fig. 1 or fig. 2.
The control circuit 304 is connected with the battery pack 303, the active equalization circuit 301 and the compensation circuit 302, respectively.
And the control circuit 304 is configured to control, when the voltage of the first cell is higher than a first threshold and the voltage of the second cell is lower than a second threshold, the electric energy of the first cell to be transmitted to the second cell through the active balancing circuit 301.
The control circuit 304 is further configured to control the compensation circuit 302 to perform charge and discharge with the first battery cell when the charge amount of the first battery cell actively performing equalization exceeds a third threshold; or when the charge amount of the second battery cell actively balanced exceeds a third threshold, the compensation circuit 302 is controlled to be charged and discharged together with the second battery cell.
The control circuit 304 may be a control chip, and the control chip may be configured to detect a voltage of each electrical core in the battery pack 303, determine whether active equalization needs to be performed by determining whether the voltage of each electrical core is greater than a first threshold or smaller than a second threshold, and control the corresponding switch to be turned on when the voltage of the first electrical core is greater than the first threshold and the voltage of the second electrical core is lower than the second threshold, so as to control electric energy of the first electrical core to be transmitted to the second electrical core through the active equalization circuit 301, and control the corresponding switch to be turned off after the active equalization is completed.
The control chip may further record the time for performing active equalization and the current of the first sensor a1, so as to determine the charge amount of the first battery cell or the second battery cell for performing active equalization, and control the corresponding switch to be closed when the charge amount accumulated by the first battery cell or the second battery cell for performing active equalization is greater than a third threshold, so that the compensation circuit 302 performs charge and discharge together with the first battery cell or the second battery cell, so as to compensate charge and discharge consumption of the first battery cell or the second battery cell. Meanwhile, the control chip may further record the current of the second sensor a2 and the time of charge and discharge compensation, so as to calculate the charge amount compensated by the compensation circuit 302 for the first battery cell or the second battery cell, and when the charge amount compensated by the compensation circuit 302 for the first battery cell or the second battery cell is equal to the charge amount actively balanced for the first battery cell or the second battery cell, control the corresponding switch to be turned off, that is, end the compensation for the first battery cell or the second battery cell.
Optionally, the control chip further stores the charge amount actively accumulated in a balanced manner in the first electric core or the second electric core in the nonvolatile memory, so that it can be ensured that the recording is not lost when the power supply and the power down are performed.
Fig. 4 is a schematic structural diagram of a power supply system according to the present invention. As shown in fig. 4, the power supply system 40 includes a battery pack 401 and a cell balancing circuit 402; the battery pack 401 is connected to the cell balancing circuit 402.
The cell balancing circuit 402 is configured to balance voltages of two battery cells in the battery pack 401 when a voltage difference between the two battery cells is greater than a fourth threshold. The fourth threshold is set according to the specific situation of the battery pack.
The cell balancing circuit 402 is any one of the above cell balancing circuits, and its implementation principle and technical effect are similar, which are not described herein again.
The utility model provides a vehicle. The vehicle includes a vehicle body and a power supply system in the embodiment shown in fig. 4; the power supply system is provided in the vehicle body; the power supply system is used for supplying power for the operation of the vehicle.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A cell balancing circuit, comprising: an active equalization circuit and a compensation circuit;
the active equalization circuit and the compensation circuit are both connected with a battery pack, and the battery pack comprises at least two battery cells;
the active equalization circuit is used for transmitting the electric energy of a first battery cell with the voltage higher than a first threshold value in the battery pack to a second battery cell with the voltage lower than a second threshold value in the battery pack;
the compensation circuit is used for carrying out charge and discharge together with the first battery cell when the charge amount of the first battery cell for active equalization exceeds a third threshold value; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, the second battery cell and the second battery cell are charged and discharged together.
2. The circuit of claim 1, wherein the active equalization circuit comprises: a capacitor and an inductor;
the first end of the capacitor is respectively connected with two poles of each battery cell through a switch; and the second end of the capacitor is connected with the first end of the inductor, and the second end of the inductor is respectively connected with two poles of each battery cell through a switch.
3. The circuit of claim 2, wherein the active equalization circuit further comprises: a first switch, a second switch, and a third switch;
a first end of the first switch is connected with a first end of the capacitor, and a second end of the first switch is connected with a first end of the inductor;
a first end of the second switch is connected with a second end of the capacitor, and a second end of the second switch is connected with a first end of the inductor;
and the first end of the third switch is connected with the second end of the capacitor, and the second end of the third switch is connected with the second end of the inductor.
4. The circuit of claim 2, wherein the active equalization circuit further comprises a first current sensor;
the first end of the first current sensor is connected with the first end of the capacitor, and the second end of the first current sensor is respectively connected with two poles of each battery cell through a switch;
the first current sensor is used for detecting the current output by the first battery cell through the active balancing circuit so as to obtain the charge amount of the first battery cell for active balancing through the current; or, detecting a current received by the second battery cell through the active balancing circuit, so as to obtain a charge amount actively balanced by the second battery cell through the current.
5. The circuit of claim 1, wherein the compensation circuit comprises: a battery and a fourth switch;
the first end of the storage battery is connected with the first end of the fourth switch, the second end of the storage battery is respectively connected with the two poles of each battery cell through the switch, and the second end of the fourth switch is respectively connected with the two poles of each battery cell through the switch.
6. The circuit of claim 5, wherein the compensation circuit further comprises: a second current sensor;
the first end of the second current sensor is connected with the first end of the storage battery, and the second end of the second current sensor is respectively connected with two poles of each battery cell through a switch;
the second current sensor is configured to detect a current output by the storage battery, so as to obtain, through the current, an amount of charge of the storage battery compensated for the first battery cell or the second battery cell.
7. The circuit of claim 5, wherein the compensation circuit further comprises: a current limiting resistor;
the current limiting resistor is connected with the storage battery in series;
the current-limiting resistor is used for preventing the compensation circuit from overflowing when the storage battery is charged and discharged together with the first battery cell or the second battery cell.
8. The circuit of any one of claims 1-7, wherein the cell balancing circuit further comprises: a control circuit;
the control circuit is respectively connected with the battery pack, the active equalization circuit and the compensation circuit;
the control circuit is configured to control, when the voltage of the first cell is higher than a first threshold and the voltage of the second cell is lower than a second threshold, the electric energy of the first cell to be transmitted to the second cell through the active balancing circuit;
the control circuit is further configured to control the compensation circuit to perform charge and discharge with the first battery cell when the charge amount of the first battery cell actively balanced exceeds a third threshold; or when the charge amount actively equalized by the second battery cell exceeds a third threshold value, controlling the compensation circuit and the second battery cell to be charged and discharged together.
9. A power supply system is characterized by comprising a battery pack and a battery cell balancing circuit; the battery pack is connected with the battery cell balancing circuit;
the battery cell balancing circuit is used for balancing the voltages of the two battery cells when the voltage difference between the two battery cells in the battery pack is greater than a fourth threshold value; the cell balancing circuit of any one of claims 1 to 8.
10. A vehicle characterized by comprising a vehicle body and the power supply system of claim 9 above; the power supply system is provided in the vehicle body;
the power supply system is used for providing power for the running of the vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920990791.5U CN209881459U (en) | 2019-06-28 | 2019-06-28 | Battery cell equalization circuit, power supply system and vehicle |
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| CN201920990791.5U CN209881459U (en) | 2019-06-28 | 2019-06-28 | Battery cell equalization circuit, power supply system and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922464A (en) * | 2021-10-29 | 2022-01-11 | 蜂巢能源科技有限公司 | Balancing method and device for power battery system and electronic equipment |
| CN114039112A (en) * | 2021-11-26 | 2022-02-11 | 蜂巢能源科技(无锡)有限公司 | Battery cell SOC regulation and control device and regulation and control method thereof |
-
2019
- 2019-06-28 CN CN201920990791.5U patent/CN209881459U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922464A (en) * | 2021-10-29 | 2022-01-11 | 蜂巢能源科技有限公司 | Balancing method and device for power battery system and electronic equipment |
| CN114039112A (en) * | 2021-11-26 | 2022-02-11 | 蜂巢能源科技(无锡)有限公司 | Battery cell SOC regulation and control device and regulation and control method thereof |
| CN114039112B (en) * | 2021-11-26 | 2023-10-20 | 蜂巢能源科技(无锡)有限公司 | Battery cell SOC regulating and controlling device and regulating and controlling method thereof |
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