Charging and discharging system, electronic device, and charging and discharging method

Abstract

The present disclosure relates to a charging and discharging system, an electronic device and a charging and discharging method. The charging and discharging system comprises: a first battery cell and a second battery cell connected in series; a third battery cell, a positive electrode of the third battery cell being connected to a positive electrode port through a first switch, and a negative electrode of the third battery cell being connected to a negative electrode port through a second switch; a switch circuit, a first end of the switch circuit being connected between the first switch and the positive electrode of the third battery cell, a second end of the switch circuit being connected between the second switch and the negative electrode of the third battery cell, and a third end of the switch circuit being connected between the first battery cell and the second battery cell; and a control chip connected to the first battery cell, the second battery cell and the third battery cell, respectively, for controlling the connection or disconnection of any one or more of the first switch, the second switch and the switch circuit when the voltages of the first battery cell and the second battery cell are different and a preset condition is met, so as to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell. The present disclosure can realize voltage balancing of two battery cells connected in series.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electronic devices, and in particular to a charging and discharging system, an electronic device, and a charging and discharging method. BACKGROUND

[0002] With the development of technology, electronic devices such as mobile phones have more and more functions, higher and higher screen-to-body ratios, and larger and larger battery capacities. In order to improve user experience, the charging speed of electronic devices is also getting faster. Due to the structural limitations of the data transmission line or the charging line of the electronic device, it is difficult for the charger to charge the electronic device with low voltage and large current. Therefore, it is often necessary to use two series-connected battery cells to increase the charging power and thus the charging speed.

[0003] In the related art, the two series-connected battery cell solution is that a protection chip collects the voltage of the battery cell and determines whether the voltage of the two battery cells is overcharged or overdischarged, and then determines whether to perform an overcharge or overdischarge protection action. This solution has the problem of inaccurate collected voltage caused by unbalanced voltage of the two series-connected battery cells. SUMMARY

[0004] To overcome the problems in the related art, the present disclosure provides a charging and discharging system, an electronic device, and a charging and discharging method.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging and discharging system is provided, comprising:

[0006] a first battery cell and a second battery cell, the first battery cell and the second battery cell being connected in series, wherein a positive electrode of the first battery cell is connected to a positive electrode port, and a negative electrode of the second battery cell is connected to a negative electrode port;

[0007] a third battery cell, a positive electrode of the third battery cell being connected to the positive electrode port through a first switch, and a negative electrode of the third battery cell being connected to the negative electrode port through a second switch;

[0008] a switch circuit, a first end of the switch circuit being connected between the first switch and the positive electrode of the third battery cell, a second end of the switch circuit being connected between the second switch and the negative electrode of the third battery cell, and a third end of the switch circuit being connected between the first battery cell and the second battery cell;

[0009] a control chip connected to the first battery cell, the second battery cell, and the third battery cell, respectively, for controlling the connection or disconnection of any one or more of the first switch, the second switch, and the switch circuit when the voltage of the first battery cell and the second battery cell is different and meets a preset condition, so as to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell.

[0010] In some embodiments, the switch circuit comprises a first branch and a second branch.

[0011] The first branch comprises a third switch and a fourth switch, a first end of the third switch is connected between the first switch and a positive electrode of the third battery cell, a second end of the third switch is connected with a first end of the fourth switch, and a second end of the fourth switch is connected between the second switch and a negative electrode of the third battery cell.

[0012] One end of the second branch is connected between the third switch and the fourth switch, and the other end of the second branch is connected between the first battery cell and the second battery cell.

[0013] In some embodiments, a fifth switch is arranged on the second branch.

[0014] In some embodiments, the first switch is further connected with a first pin of the control chip, the second switch is further connected with a second pin of the control chip, a third end of the third switch is connected with a third pin of the control chip, a third end of the fourth switch is connected with a fourth pin of the control chip, and the fifth switch is further connected with a fifth pin of the control chip.

[0015] In some embodiments, the first switch, the second switch, the third switch, the fourth switch and the fifth switch are single-channel MOS tubes.

[0016] In some embodiments, the capacity of the third battery cell is smaller than that of the first battery cell or the second battery cell.

[0017] In some embodiments, further comprising: a first resistor; the negative electrode of the second battery cell and the second switch are connected with the negative electrode port through the first resistor.

[0018] In some embodiments, a sixth pin of the control chip is connected with a first end of the first resistor, and a seventh pin of the control chip is connected with a second end of the first resistor.

[0019] In some embodiments, an eighth pin and a ninth pin of the control chip are connected with a processor of an electronic device.

[0020] In some embodiments, further comprising: a protection chip, the protection chip is connected with the control chip, the first battery cell and the second battery cell respectively.

[0021] According to a second aspect of the embodiments of the present disclosure, an electronic device is provided, comprising the charging and discharging system described in any one of the above.

[0022] According to a third aspect of the embodiments of the present disclosure, a charging and discharging method is provided, applied to the electronic device described above, and the method comprises:

[0023] acquire a first voltage of the first battery cell and a second voltage of the second battery cell in a preset state;

[0024] In response to the first voltage and the second voltage being different and satisfying a preset condition, control the third battery cell to be charged or discharged in series with the first battery cell or the second battery cell.

[0025] In some embodiments, in response to the preset state being a constant-voltage charging state, the preset condition is that a voltage difference between the first voltage and the second voltage reaches a first threshold value;

[0026] The control of the third battery cell to be charged or discharged in series with the first battery cell or the second battery cell includes:

[0027] controlling the communication or disconnection of any one or more of the first switch, the second switch and the switching circuit to make the third battery cell be charged in series with a target battery cell, wherein the target battery cell is a battery cell corresponding to a smaller voltage of the first voltage and the second voltage.

[0028] In some embodiments, in response to the preset state being a discharging state, the preset condition is that the first voltage or the second voltage reaches a second threshold value, the second threshold value representing a discharging cutoff voltage threshold value;

[0029] The control of the third battery cell to be charged or discharged in series with the first battery cell or the second battery cell includes:

[0030] controlling the communication or disconnection of any one or more of the first switch, the second switch and the switching circuit to make the third battery cell be discharged in series with a target battery cell, wherein the target battery cell is a battery cell corresponding to a larger voltage of the first voltage and the second voltage that does not reach the second threshold value.

[0031] The technical solutions provided by the embodiments of the present disclosure can include the following beneficial effects: the charging and discharging system of the present disclosure sets the third battery cell to achieve the voltage balancing effect. In the scenario where the first battery cell and the second battery cell are not balanced in charging and discharging, by controlling the different switching elements or circuits through the control chip, the third battery cell is charged or discharged in series with the first battery cell or the second battery cell, avoiding damage or capacity loss of a certain battery cell of the first battery cell or the second battery cell, and achieving the effect of balancing the first battery cell and the second battery cell.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0034] Figure 1 is a circuit diagram of a charge-discharge system according to an example embodiment.

[0035] Figure 2 is a flowchart of a method according to an example embodiment.

[0036] Figure 3 is a block diagram of an apparatus according to an example embodiment.

[0037] Figure 4 is a block diagram of a terminal device according to an example embodiment. DETAILED DESCRIPTION

[0038] The example embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description of example embodiments is not representative of all embodiments consistent with the present application. Instead, it is merely an example of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0039] With the development of technology, electronic devices such as mobile phones have more and more functions, higher and higher screen-to-body ratios, and larger and larger battery capacities. In order to improve user experience, the charging speed of electronic devices is also getting faster and faster. Due to the structural limitations of the data transmission line or the charging line of the electronic device, it is difficult for the charger to charge the electronic device with low voltage and large current. Therefore, it is often necessary to use two battery cells in series to increase the charging power and thus the charging speed.

[0040] Under the influence of factors such as production environment and equipment error, even if two battery cells of the same capacity are used under the same conditions, the aging speed and internal resistance of each battery cell are not the same. Therefore, when two battery cells with different internal resistances are charged and discharged in parallel, the phenomenon of voltage imbalance of the battery cells occurs. Such voltage imbalance phenomenon usually includes two aspects:

[0041] When charging, one battery cell has reached the full charge voltage, and the other battery cell has not reached the full charge voltage. The protection battery cell will cut off the charging circuit to stop charging the wire to prevent damage to the fully charged battery cell. However, after cutting off the charging circuit, the other battery cell will cause capacity loss due to not being fully charged.

[0042] When discharging, one battery cell has reached the over-discharge voltage, and the other battery cell has not reached the over-discharge voltage. The protection battery cell will cut off the discharge circuit to stop discharging the battery cell to prevent damage to the over-discharged battery cell. However, after cutting off the discharge circuit, the other battery cell will cause capacity loss due to not being fully discharged.

[0043] In the two-cell series solution in the related art, the protection chip usually collects the cell voltage and directly determines whether the voltage of the two cells is overcharged or overdischarged, and then determines whether to perform overcharge or overdischarge protection action. However, in combination with the above imbalance phenomenon, the detected voltage in the related art is not accurate due to the voltage imbalance phenomenon. Furthermore, when the protection strategy is performed according to the detected voltage, the problems of capacity loss or overcharge and overdischarge damage to the cells are prone to occur.

[0044] In addition, there is a way to balance the two series cells through a software algorithm in the related art, but the pure software algorithm way has limited application conditions and slow reaction.

[0045] The charging and discharging system of the present disclosure includes: a first cell and a second cell connected in series, wherein the positive electrode of the first cell is connected with the positive electrode port, and the negative electrode of the second cell is connected with the negative electrode port; a third cell, the positive electrode of the third cell is connected with the positive electrode port through a first switch, and the negative electrode of the third cell is connected with the negative electrode port through a second switch; a switch circuit, the first end of the switch circuit is connected between the first switch and the positive electrode of the third cell, the second end is connected between the second switch and the negative electrode of the third cell, and the third end is connected between the first cell and the second cell; a control chip connected with the first cell, the second cell and the third cell, respectively, for controlling the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit when the voltage of the first cell and the second cell is different and meets the preset condition, so that the third cell is connected in series with the first cell or the second cell for charging or discharging. The charging and discharging system of the present disclosure sets the third cell to realize the voltage balancing effect. When the first cell and the second cell are not balanced in the charging and discharging scene, the control chip controls the different switch elements or circuits to realize the series charging and discharging of the third cell and the first cell or the second cell, avoids the damage or capacity loss of the first cell or the second cell, and realizes the balancing effect of the first cell and the second cell.

[0046] In one exemplary embodiment, as shown in Figure 1 The charging and discharging system of the present embodiment includes: a first cell 10 and a second cell 20, a third cell 30, a switch circuit 40, and a control chip 50.

[0047] The first cell 10 and the second cell 20 are connected in series. The positive electrode of the first cell 10 is connected with the positive electrode port (P+) 100, and the negative electrode of the second cell 20 is connected with the negative electrode port (P-) 200. In the present embodiment, the negative electrode of the first cell 10 is connected with the positive electrode of the second cell 20. The positive electrode of the third cell 30 is connected with the positive electrode port 100 through a first switch (GA) 60, and the negative electrode of the third cell 30 is connected with the negative electrode port 200 through a second switch (GC) 70.

[0048] The first end of the switch circuit 40 is connected between the first switch 60 and the positive electrode of the third battery cell 30, the second end is connected between the second switch 70 and the negative electrode of the third battery cell 30, and the third end is connected between the first battery cell 10 and the second battery cell 20. The control chip 50 is connected with the first battery cell 10, the second battery cell 20 and the third battery cell 30 respectively, and is used to control the connection or disconnection of any one or more of the first switch 60, the second switch 70 and the switch circuit 40 when the voltages of the first battery cell 10 and the second battery cell 20 are different and meet a preset condition, so as to make the third battery cell 30 and the first battery cell 10 or the second battery cell 20 series charging or discharging.

[0049] In the embodiment, the control chip 50 is a multi-control coulometer for example. The capacities of the first battery cell 10 and the second battery cell 20 are the same; the capacity of the third battery cell 30 is smaller than that of the first battery cell 10 or the second battery cell 20, and the volume of the third battery cell 30 is also smaller than that of the first battery cell 10 or the second battery cell 20. The third battery cell 30 is used as an equalization battery cell, and the initial state of the electric quantity of the third battery cell 30 can be 50% SOC (State of Charge) for example. The first switch 60 and the second switch 70 can be MOS tubes, for example single-channel MOS tubes.

[0050] In combination Figure 1 As shown in the figure, the charging and discharging system of the embodiment can include a main charging and discharging circuit and an equalization circuit.

[0051] In the main charging and discharging circuit: a series circuit containing the first battery cell 10 and the second battery cell 20, and the main charging and discharging circuit further includes a first resistor 80, a switch element G1 and a switch element G2; wherein G1 and G2 can be MOS tubes. In the embodiment, the charging and discharging system further includes a protection chip 90 connected with the control chip 50, the first battery cell 10 and the second battery cell 20 respectively, and can be used to control the connection or disconnection of G1 and G2.

[0052] The equalization circuit includes a circuit composed of the third battery cell 30, the switch circuit 40, the first switch 60 and the second switch 70.

[0053] In a conventional charging scenario: the first switch 60, the second switch 70 and the switch circuit 40 are all in a disconnected state, that is, the equalization circuit is disconnected; and the main charging and discharging circuit is used for charging and discharging. In this scenario, the third battery cell 30 does not participate in charging and discharging, and the first battery cell 10 and the second battery cell 20 series charging and discharging. The current flow direction during charging can be, for example: from the positive electrode port (P+) 100 to the first battery cell 10 and the second battery cell 20, and then through related elements (such as the first resistor 80 and the switch elements G1 and G2) to the negative electrode port (P-) 200.

[0054] When the first voltage of the first battery cell 10 and the second voltage of the second battery cell 20 are different and a preset condition is met, such as when the first battery cell 10 and the second battery cell 20 are in an unbalanced scenario during charging and discharging, the control chip 50 can control the first switch 60 and the second switch 70 to open, and control the connection mode of the switch circuit 40, so that the third battery cell 30 is connected in series with the first battery cell 10 or the second battery cell 20 to participate in charging and discharging. Thus, the unbalanced battery cell in the first battery cell 10 and the second battery cell 20 is balanced, the life of the battery cell is maintained, and the phenomenon of capacity loss is improved.

[0055] In one exemplary embodiment, as shown in Figure 1 The switch circuit 40 includes a first branch 401 and a second branch 402.

[0056] The first branch 401 includes a third switch (GD) 4011 and a fourth switch (GE) 4012. The first end of the third switch 4011 is connected between the first switch 60 and the positive electrode of the third battery cell 30. The second end of the third switch 4011 is connected to the first end of the fourth switch 4012. The second end of the fourth switch 4012 is connected between the second switch 70 and the negative electrode of the third battery cell 30.

[0057] One end of the second branch 402 is connected between the third switch 4011 and the fourth switch 4012. The other end of the second branch 402 is connected between the first battery cell 10 and the second battery cell 20.

[0058] In this embodiment, the third switch 4011 and the fourth switch 4012 can be MOS tubes, for example, single-channel MOS tubes. By controlling the state of the third switch 4011 and the fourth switch 4012, the connection state of the first branch 401 can be controlled. In combination with the connection state of the second branch 402, the connection of the switch circuit 40 with the first battery cell 10 or the second battery cell 20 can be realized, and then the connection of the third battery cell 30 with the first battery cell 10 or the second battery cell 20 is facilitated.

[0059] In this embodiment, the fifth switch (GB) 4021 is provided on the second branch 402. The fifth switch 4021 can be a MOS tube, for example, a single-channel MOS tube.

[0060] As shown in Figure 1 The second branch 402 divides the first branch 401 into two parts, one part containing the third switch 4011 and the other part containing the fourth switch 4012. The control chip 50 can control the second branch 402 to be connected, and control the third switch 4011 or the fourth switch 4012 to be connected, for example, control the third switch 4011 to be connected and the fourth switch 4012 to be disconnected, so that the third switch 4011 and the second branch 402 are in a connected state.

[0061] In one exemplary embodiment, such as Figure 1 As shown, the first switch 60 is also connected to the first pin OUT1 of the control chip 50, the second switch 70 is also connected to the second pin OUT4 of the control chip 50, the third terminal of the third switch 4011 is connected to the third pin OUT2 of the control chip 50, the third terminal of the fourth switch 4012 is connected to the fourth pin OUT5 of the control chip 50, and the fifth switch 4021 is also connected to the fifth pin OUT3 of the control chip 50.

[0062] In this embodiment, the first, second, third, fourth, and fifth pins are the five output pins of the control chip. The control chip 50 controls the corresponding switch to open by outputting a low level on the output pin, and controls the corresponding switch to open by outputting a high level on the output pin. For example, if the control chip 50 outputs a low level on the first pin, the first switch 60 will open.

[0063] Among them, the eighth pin SDA and the ninth pin SCL of the control chip 50 are connected to the processor of the electronic device (such as the application processor AP).

[0064] Combination Figure 1 In the above embodiments, in this disclosure embodiment, when the first voltage and the second voltage are different and the preset conditions are met, the control chip 50 controls the third battery cell 30 to be connected in series with the first battery cell 10 or the second battery cell 20. This can be achieved by controlling the different on / off states of the first switch 60, the second switch 70, and the third switch 4011, the fourth switch 4012 and the fifth switch 4021 in the switch circuit 40.

[0065] In the first example:

[0066] The control chip 50 controls the connection or disconnection of any one or more of the first switch 60, the second switch 70, and the switching circuit 40 to enable the third battery cell 30 and the second battery cell 10 to be charged in series. This example is applicable when the first battery cell 10 and the second battery cell 20 are unbalanced during the charging phase and when the battery is close to full charge.

[0067] In this example, considering the charging stages of an electronic device, the period nearing full charge is typically a constant-voltage charging stage. Therefore, the conditions for full charge can be set, for example, at a constant charging voltage and reaching a set cutoff charging current. During the constant-voltage charging stage, the control chip 50 can detect the first voltage V of the first cell 10 in real time. cell1 The second voltage V of the second cell 20 cell2 .

[0068] When the first voltage V cell1 Second voltage V cell2 The voltage difference is different and reaches the first threshold (ΔV). For example: the first voltage Vcell1 greater than the second voltage V cell2 , and V cell1 -V cell2 = ΔV, it indicates that the first battery cell 10 and the second battery cell 20 are unbalanced, the first battery cell 10 is almost full, while the second battery cell 20 is not full (at this time, if the charging continues, the first battery cell 10 will be overcharged and damaged; if the charging stops, the second battery cell 20 will not be full and capacity loss will occur). In the charging scenario, the second battery cell 20 with a smaller voltage, i.e., in an uncharged state, is determined as the target battery cell.

[0069] The present example can perform the following balancing operation to control the third battery cell 30 and the target battery cell to be in series charging:

[0070] In combination with the foregoing embodiments, the capacity of the third battery cell 30 is smaller than that of the first battery cell 10, and the first battery cell 10 is in a fast full state, then the third voltage V cell3 satisfies: V cell3 <V cell1 . Therefore, the processor of the electronic device issues a control signal, and the control chip 50 controls the first pin, the fourth pin and the fifth pin to output high level according to the control signal, so as to respectively control the first switch (GA) 60 to be connected, the fourth switch (GE) 4012 in the switch circuit 40 to be connected, and the fifth switch (GB) 4021 in the switch circuit 40 to be connected. The second switch (GC) 70 and the third switch (GD) 4011 in the switch circuit 40 are disconnected.

[0071] The third battery cell 30 and the second battery cell 20 are controlled to be charged. The current flow direction during the charging process is, for example: from the positive port (P+) 100 to the first switch (GA) 60, to the third battery cell 30, to the second battery cell 20 through the fourth switch (GE) 4012 and the fifth switch (GB) 4021, and finally to the negative port (P-) 200.

[0072] When V cell1 = V cell2 , i.e., the first battery cell 10 and the second battery cell 20 have reached balance, the control chip 50 controls the first switch (GA) 60, the fourth switch (GE) 4012 and the fifth switch (GB) 4021 to be disconnected.

[0073] In combination with Figure 1As shown, when reaching equilibrium, the control chip 50 can report the charging capacity of the third battery 30 to the processor of the electronic device through the SDA and SCL pins respectively. The electronic device performs the following system capacity calibration: when performing the capacity UI display, the displayed capacity = total capacity - charging capacity of the third battery 30, thereby ensuring that the electronic device always displays the capacity of the first battery 10 and the second battery 20. Thereafter, the electronic device can control to continue constant voltage charging of the first battery 10 and the second battery 20.

[0074] When the second voltage V cell2 is greater than the first voltage V cell1 , and V cell2 -V cell1 = ΔV, the scenario can refer to the above-mentioned embodiments, which will not be described here again. Throughout the charging process, the voltage balancing of the first battery 10 and the second battery 20 can be continuously performed until the end of the charging process (the first voltage and the second voltage both reach the full charging condition).

[0075] It can be understood that when the current flows from the positive port 100, due to the existence of the third battery 30 with small capacity and small residual capacity, the current will directly flow through the third battery, and will not or rarely flow to the first battery 10.

[0076] In a second example:

[0077] The control chip 50 controls the communication or disconnection of any one or more of the first switch 60, the second switch 70, and the switch circuit 40, to realize the series discharge of the third battery 30 and the first battery 10. The applicable scenario of this example is: during the discharge phase and close to the full discharge state, the first battery 10 and the second battery 20 are not balanced.

[0078] In this example, during the discharge phase of the electronic device, the full discharge condition can be set as, for example, the discharge voltage reaches a second threshold value, which represents a discharge cutoff voltage threshold value. During the discharge phase, the control chip 50 can detect the voltages of the first battery 10 and the second battery 20 in real time.

[0079] When the first voltage V cell1 and the second voltage V cell2 are different, and only one of the voltages reaches the second threshold value. For example: the first voltage V cell1 is greater than the second voltage V cell2 , and only V cell2 reaches the second threshold value, indicating that the first battery 10 and the second battery 20 are not balanced, the second battery 20 has completed the discharge, and the first battery 10 can still be discharged (at this time, if the discharge continues, the second battery 20 will be over-discharged and damaged; if the discharge is stopped, the first battery 10 will not be fully discharged and will lose capacity). In the discharge scenario, the first battery 10 with the greater voltage and not reaching the second threshold value is determined as the target battery.

[0080] The present example can perform the following balancing operation to control the third battery cell 30 to discharge in series with the target battery cell:

[0081] In combination with the foregoing embodiments, the capacity of the third battery cell 30 is less than that of the second battery cell 20, and the second battery cell 20 is in a fast discharge completion state, then the third voltage V cell3 satisfies: V cell3 > V cell2 Therefore, the processor of the electronic device issues a control signal, and the control chip 50 controls the second pin, the third pin and the fifth pin to output high level according to the control signal, so as to respectively control the second switch (GC) 70, the third switch (GD) 4011 in the switch circuit 40 and the fifth switch (GB) 4021 in the switch circuit 40 to be connected. The first switch (GA) 60 and the fourth switch (GE) 4012 in the switch circuit 40 are disconnected.

[0082] The third battery cell 30 and the first battery cell 10 are controlled to discharge. The current flow direction during the discharging process is, for example: from the positive electrode of the third battery cell 30 to the third switch (GD) 4011, through the fifth switch (GB) 4021 to the first battery cell 10, to the positive electrode port (P+) 100; and then back to the negative electrode of the third battery cell 30 through the negative electrode port (P-) 200 and the second switch (GC) 70.

[0083] When V cell1 = V cell2 = the second threshold value, that is, the first battery cell 10 and the second battery cell 20 have reached balance, the control chip 50 controls the second switch (GC) 70, the third switch (GD) 4011 and the fifth switch (GB) 4021 to be disconnected.

[0084] In combination with Figure 1 shown, when balance is reached, the control chip 50 can report the discharge capacity of the third battery cell 30 to the processor of the electronic device through the SDA and SCL pins respectively. The electronic device performs the following system capacity calibration: when determining the capacity displayed by the UI, the discharge capacity of the third battery cell 30 needs to be subtracted from the total discharge capacity to obtain the discharge capacity sum of the first battery cell 10 and the second battery cell 20. According to the discharge capacity sum, the capacity to be displayed is determined, so as to ensure that the electronic device always displays the capacity of the first battery cell 10 and the second battery cell 20. Thereafter, the electronic device can control to continue constant voltage charging of the first battery cell 10 and the second battery cell 20.

[0085] When the second voltage V cell2 is greater than the first voltage V cell1 , and V cell1The scenario when the second threshold is reached can refer to the above-mentioned embodiments, which will not be described here again. Throughout the discharging process, the voltage balancing of the first battery cell 10 and the second battery cell 20 can be continuously performed until the end of the discharging process (the first voltage and the second voltage both reach the full discharge condition).

[0086] In an exemplary embodiment, still referring to Figure 1 The charging and discharging system of the embodiment further includes a first resistor (Rsense) 80. The negative electrode of the second battery cell 20 and the second switch 70 are both connected to the negative electrode port 200 through the first resistor 80.

[0087] The negative electrode of the second battery cell 20 and the second switch 70 are both connected to the first end of the first resistor 80, and the second end of the first resistor 80 is connected to the negative electrode port 200. The protection chip 90 in the main charging and discharging circuit can determine whether the charging and discharging overcurrent occurs by detecting the voltage on the first resistor 80, and then perform the charging and discharging overcurrent protection action.

[0088] In the embodiment, the sixth pin (SRN) of the control chip 50 is connected to the first end of the first resistor 80, and the seventh pin (SRP) of the control chip 50 is connected to the second end of the first resistor 80.

[0089] The control chip 50 can also determine whether the charging and discharging overcurrent occurs by detecting the voltage on the first resistor 80, and then perform the charging and discharging overcurrent protection action.

[0090] The charging and discharging system in the embodiment of the disclosure improves the circuit hardware structure to realize the voltage balancing of the first battery cell 10 and the second battery cell 20 in series, effectively improves the problem of battery cell damage or capacity loss caused by voltage imbalance. Compared with the algorithm balancing mode, the reaction is faster and more accurate. Moreover, in the scenario of charging the lithium battery of the electronic device, the safety of the battery cell can be ensured while ensuring the high-power fast charging.

[0091] In an exemplary embodiment, the embodiment of the disclosure further proposes an electronic device including the charging and discharging system related to the above-mentioned embodiments.

[0092] In an exemplary embodiment, the embodiment of the disclosure further proposes a charging and discharging method applied to the above-mentioned electronic device. The electronic device is, for example, a mobile phone, a tablet computer, a notebook computer, or the like.

[0093] As Figure 2 shown, the method of the embodiment can include the following steps:

[0094] S110, in a preset state, obtaining a first voltage of a first battery cell and a second voltage of a second battery cell.

[0095] S120, in response to the first voltage and the second voltage being different and the preset condition being met, controlling the third battery cell to be charged or discharged in series with the first battery cell or the second battery cell.

[0096] In step S110, the preset state includes a constant voltage charging state or a discharging state. In combination with Figure 1 As shown, the control chip 50 or the protection chip 90 can detect the first voltage and the second voltage, and the processor of the electronic device can obtain the first voltage and the second voltage.

[0097] In step S120, the preset condition corresponds to the preset state. For example, the preset state is a constant voltage charging state, and the preset condition is that the voltage difference between the first voltage and the second voltage reaches a first threshold. For another example, the preset state is a discharging state, and the preset condition is that the first voltage or the second voltage reaches a second threshold, and the second threshold represents a discharging cutoff voltage threshold.

[0098] According to the different relationship between the first voltage and the second voltage, the processor can determine the type or specific situation of the imbalance of the first battery cell and the second battery cell, so as to control the third battery cell to be charged or discharged in series with the first battery cell or the second battery cell by controlling the on-off of different switching elements, thereby achieving the balancing effect.

[0099] In an exemplary embodiment, in response to the preset state being a constant voltage charging state, the preset condition is that the voltage difference between the first voltage and the second voltage reaches a first threshold. In this embodiment, step S120 can include the following steps:

[0100] S1201, controlling the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit, so as to make the third battery cell charge in series with the target battery cell.

[0101] In this step, the target battery cell is the battery cell corresponding to the smaller voltage of the first voltage and the second voltage. For example, the first voltage V cell1 is greater than the second voltage V cell2 and the voltage difference reaches a first threshold (ΔV), then the target battery cell is the second battery cell.

[0102] In combination with Figure 1 As shown, in this embodiment, the processor issues a control signal, and the control chip 50 makes the first pin, the fourth pin and the fifth pin all output high level according to the control signal, so as to respectively control the first switch (GA) 60 to be connected, the fourth switch (GE) 4012 in the switch circuit 40 to be connected, and the fifth switch (GB) 4021 in the switch circuit 40 to be connected. Thus, the third battery cell 30 and the second battery cell 20 are charged in series. Until the first voltage is equal to the second voltage. For details, please refer to the first example described above, which will not be repeated here.

[0103] In one example embodiment, in response to the preset state being the discharging state, the preset condition is that the first voltage or the second voltage reaches a second threshold value, the second threshold value representing a discharging cutoff voltage threshold value. In this embodiment, the step S120 can include the following steps:

[0104] S1202, control the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit, so as to make the third electric core and the target electric core series discharge.

[0105] In this step, the target electric core is the electric core corresponding to the voltage which is larger and does not reach the second threshold value among the first voltage and the second voltage. For example, the first voltage V cell1 is greater than the second voltage V cell2 , and only V cell2 reaches the second threshold value, then the target electric core is not the first electric core.

[0106] As shown in Figure 1 , the processor issues a control signal, and the chip 50 controls the second pin, the third pin and the fifth pin to output high level according to the control signal, so as to respectively control the communication of the second switch (GC) 70, the third switch (GD) 4011 in the switch circuit 40 and the fifth switch (GB) 4021 in the switch circuit 40. Thus, the third electric core 30 and the first electric core 10 are series discharged. Until the first voltage is equal to the second voltage and equal to the second threshold value. For details, please refer to the second example described above, which will not be repeated here.

[0107] In one example embodiment, the present embodiment also proposes a charging and discharging device, which is applied to the above-mentioned electronic equipment. As shown in Figure 3 , the device of the present embodiment includes an acquisition module 110 and a control module 120. The device of the present embodiment is used to realize the method as shown in Figure 2 . Wherein, the acquisition module 110 is used to acquire the first voltage of the first electric core and the second voltage of the second electric core in the preset state. The control module 120 is used to control the third electric core and the first electric core or the second electric core to series charge or discharge in response to the first voltage and the second voltage being different and satisfying the preset condition.

[0108] As shown in Figure 4 is a block diagram of a terminal device. The present disclosure also provides a terminal device, for example, the device 500 can be a mobile phone, a computer, a digital broadcast terminal, a message transmission device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0109] The device 500 can include one or more of the following components: a processing component 502, a memory 504, a power supply component 506, a multimedia component 508, an audio component 510, an input / output (I / O) interface 512, a sensor component 514, and a communication component 516.

[0110] The processing component 502 usually controls overall operations of the device 500, such as operations associated with display, phone call, data communication, camera operation and recording operation. The processing component 502 can include one or more processors 520 to execute instructions to complete all or part of steps of the methods described above. Additionally, the processing component 502 can include one or more modules to facilitate interaction between the processing component 502 and other components. For example, the processing component 502 can include a multimedia module to facilitate the interaction between the multimedia component 508 and the processing component 502.

[0111] The memory 504 is configured to store various types of data to support operations of the device 500. Examples of these data include instructions for any application or method operating on the device 500, contact data, phonebook data, messages, pictures, videos, and so on. The memory 504 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0112] The power supply component 506 supplies electrical power for various components of the device 500. The power supply component 506 can include a power management system, one or more power supplies, and other components associated with generating, managing and distributing electrical power for the device 500.

[0113] The multimedia component 508 includes a screen providing an output interface between the device 500 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 508 includes a front camera and / or a back camera. The front camera and / or the back camera can receive external multimedia data when the device 500 is in an operation mode, such as a shooting mode or a video mode. Each of the front and back cameras can be a fixed optical lens system or have a focal length and optical zoom capability.

[0114] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC) that is configured to receive an external audio signal when the device 500 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 504 or transmitted via the communication component 516. In some embodiments, the audio component 510 also includes a speaker for outputting an audio signal.

[0115] The I / O interface 512 provides an interface between the processing component 502 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0116] The sensor component 514 includes one or more sensors for providing status assessments of various aspects of the device 500. For example, the sensor component 514 can detect an open / closed position of the device 500, relative positioning of components, such as a display and a keypad of the device 500, a change of position of the device 500 or a component of the device 500, presence or absence of user contact with the device 500, a change in orientation or acceleration / deceleration of the device 500, and temperature changes of the device 500, among other possibilities. The sensor component 514 can include proximity sensor configured to detect presence of an object in proximity to the device 500 without any physical touch. The sensor component 514 can also include a light sensor (e.g., a CMOS or CCD image sensor) configured to work in an imaging application. In some embodiments, the sensor component 514 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0117] The communication component 516 is configured to facilitate wired or wireless communication between the device 500 and another device. The device 500 can access a wireless network based on a corresponding communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an example embodiment, the communication component 516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 516 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0118] In an exemplary embodiment, the device 500 can be implemented using one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components, for performing the above-described methods.

[0119] Another exemplary embodiment of the present disclosure provides a non-transitory computer-readable storage medium, such as the memory 504 including instructions executable by the processor 520 of the device 500 to perform the above-described methods. For example, the computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc. When the instructions in the storage medium are executed by the processor of the terminal device, the terminal device is enabled to perform the above-described methods.

[0120] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the present application, along with all of the equivalents thereof. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0121] It is to be understood that the application is not limited to the precise construction herein described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present application. The scope of the application is to be indicated by the appended claims, rather than the examples that have been described in the specification.

Claims

1. A charge-discharge system characterized by comprising: The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system.

2. The charge and discharge system according to claim 1, characterized by, The application relates to a charging and discharging system.

3. The charge and discharge system according to claim 2, characterized by, The application relates to a charging and discharging system.

4. The charge and discharge system according to claim 2, characterized by The application relates to a charging and discharging system.

5. The charge and discharge system according to any one of claims 1 to 4, characterized by, The application relates to a charging and discharging system.

6. The charge and discharge system according to any one of claims 1 to 4, characterized by, The application relates to a charging and discharging system. The application relates to a charging and discharging system.

7. The charge and discharge system according to claim 6, characterized by The application relates to a charging and discharging system.

8. The charge and discharge system according to any one of claims 1 to 4, characterized by, The application relates to a charging and discharging system.

9. The charge and discharge system according to any one of claims 1 to 4, characterized by, The application relates to a charging and discharging system. The application relates to a charging and discharging system.

10. An electronic device, comprising: The application relates to a charging and discharging system.

11. A charge-discharge method characterized by comprising: The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application relates to a charging and discharging system. The application When the first voltage and the second voltage are different and a preset condition is met, the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit is controlled to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell.

12. The charge and discharge method according to claim 11, wherein In response to the preset state being a constant-voltage charging state, the preset condition is that a pressure difference between the first voltage and the second voltage reaches a first threshold value. The control of the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell includes: The control of the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell includes:

13. The charge and discharge method according to claim 11, wherein In response to the preset state being a discharging state, the preset condition is that the first voltage or the second voltage reaches a second threshold value, and the second threshold value represents a discharging cutoff voltage threshold value. The control of the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell includes: The control of the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell includes: The control of the communication or disconnection of any one or more of the first switch, the second switch and the switch circuit to make the third battery cell charge or discharge in series with the first battery cell or the second battery cell includes:

Images