Discharge control system

Abstract

The invention is suitable for the technical field of batteries, and provides a discharge control system. The discharging control system comprises the steps that a first battery obtains a first voltage of the first battery and a second voltage sent by a second battery; the first battery compares the first voltage with the second voltage; when the first voltage is greater than the second voltage, the first battery turns on a first charging switch of the first battery, and current detection is performed on the first battery to obtain first current information of the first battery; the first battery judges the overall use state of the first battery and the second battery according to the first current information; if it is judged that the overall use state is a discharge state, the first battery turns on a first discharge switch of the first battery and sends a first control signal to the second battery; the second battery switches off a second charging switch and a second discharging switch of the second battery according to the first control signal. According to the embodiment of the invention, the damage to the two groups of interconnected batteries during discharging can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a discharge control system. Background Art

[0002] With the development of urbanization, more and more users are starting to use short-distance transportation tools such as electric vehicles. Usually, the original electric vehicle purchased by the user only has one battery or a group of batteries. Due to the demand for mileage or power usage, users often increase the number of batteries or battery packs when purchasing the electric vehicle or after using the electric vehicle for a period of time to meet the demand for mileage or power usage.

[0003] In some typical scenarios, when the user installs a battery or battery pack after using the electric vehicle for a period of time, the voltage of the installed battery is often different from the voltage of the initial battery due to the influence of the battery power. When the user connects the two and uses them to power the electric vehicle, the battery with a high voltage tends to charge the battery with a low voltage due to the potential difference between the two. At this time, for the high-voltage battery, it needs to power external devices and charge the low-voltage battery, which can easily cause the discharge current of the high-voltage battery to exceed its rated discharge current, thereby causing the battery temperature to rise and easily damage the battery. For the low-voltage battery, it will not only receive the electrical energy of the high-voltage battery, but also power external devices, that is, it has the situation of simultaneous charging and discharging, which will also affect the service life of the low-voltage battery. That is, in the related art, when the two groups of batteries are discharged, it is easy to damage the battery. Summary of the invention

[0004] The embodiment of the present application provides a discharge control system, which can solve the problem in the related art that two groups of batteries are easily damaged during discharge.

[0005] In a first aspect, an embodiment of the present application provides a discharge control system, the discharge control system comprising a first battery and a second battery, the first battery being connected in parallel and in communication connection with the second battery, the first battery comprising a first control unit, a first voltage detection unit, a first current detection unit, a first communication unit, a first charging switch, and a first discharging switch, the second battery comprising a second control unit, a second voltage detection unit, a second communication unit, a second charging switch, and a second discharging switch;

[0006] The first voltage detection unit is used to obtain a first voltage of the first battery;

[0007] The second voltage detection unit is used to obtain a second voltage of the second battery;

[0008] The second control unit is used to send the second voltage to the first control unit through the second communication unit and the first communication unit;

[0009] The first control unit is used to compare the first voltage and the second voltage;

[0010] When the first voltage is greater than the second voltage, the first control unit is used to turn on a first charging switch of the first battery, and perform current detection on the first battery through the first current detection unit to obtain first current information of the first battery;

[0011] The first control unit is used to determine the overall usage status of the first battery and the second battery according to the first current information;

[0012] If it is determined that the overall use state is a discharge state, the first control unit is used to turn on the first discharge switch and send a first control signal to the second control unit through the first communication unit and the second communication unit;

[0013] The second control unit is used for turning off the second charging switch and the second discharging switch according to the first control signal.

[0014] The beneficial effect of the embodiment of the present application compared with the prior art is that when the voltages of the two groups of batteries are different, the embodiment of the present application turns on the charging switch of the high-voltage battery (i.e., the first battery) and detects the current information of the high-voltage battery to determine the overall use status of the two groups of batteries. And when the overall use status is the discharge state, the charging switch and the discharging switch of the high-voltage battery are turned on to realize the discharge of the high-voltage battery to the external device. At the same time, the charging switch and the discharging switch of the second battery are turned off to prevent the low-voltage battery from receiving the electrical energy of the high-voltage battery, thereby avoiding the battery damage caused by the simultaneous charging and discharging of the low-voltage battery. In addition, since the low-voltage charging switch is turned off, the high-voltage battery will not discharge to the low-voltage battery, which can avoid the battery damage caused by the high-voltage battery exceeding the rated discharge current during discharge. That is, the embodiment of the present application can reduce the damage suffered by the two groups of interconnected batteries during discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a system schematic diagram of a discharge control system provided in an embodiment of the present application;

[0017] Figure 2is a specific system schematic diagram of a discharge control system provided in an embodiment of the present application;

[0018] Figure 3 It is a circuit diagram of a discharge control system provided in an embodiment of the present application.

[0019] The accompanying drawings are as follows:

[0020] 1. Discharge control system; 11. First battery; 111. First control unit; 112. First voltage detection unit; 113. First current detection unit; 114. First communication unit; 115. First charging switch; 116. First discharge switch; 12. Second battery; 121. Second control unit; 122. Second voltage detection unit; 123. Second current detection unit; 124. Second communication unit; 125. Second charging switch; 126. Second discharge switch. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are protected by the present application.

[0022] It should be noted that the terms "include", "comprises" and "have" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, terminal, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices. In the claims, specification and drawings of the present application, relational terms such as "first" and "second" are merely used to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any such real-time relationship or order between these entities / operations / objects.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] With the development of urbanization, more and more users are starting to use short-distance transportation tools such as electric vehicles. Usually, the original electric vehicle purchased by the user only has one battery or a group of batteries. Due to the demand for mileage or power usage, users often increase the number of batteries or battery packs when purchasing the electric vehicle or after using the electric vehicle for a period of time to meet the demand for mileage or power usage.

[0025] In some typical scenarios, when the user installs a battery or battery pack after using the electric vehicle for a period of time, the voltage of the installed battery is often different from the voltage of the initial battery due to the influence of the battery power. When the user connects the two and uses them to power the electric vehicle, the battery with a high voltage tends to charge the battery with a low voltage due to the potential difference between the two. At this time, for the high-voltage battery, it needs to power external devices and charge the low-voltage battery, which can easily cause the discharge current of the high-voltage battery to exceed its rated discharge current, thereby causing the battery temperature to rise and easily damage the battery. For the low-voltage battery, it will not only receive the electrical energy of the high-voltage battery, but also power external devices, that is, it has the situation of simultaneous charging and discharging, which will also affect the service life of the low-voltage battery. That is, in the related art, when the two groups of batteries are discharged, it is easy to damage the battery.

[0026] In view of this, an embodiment of the present application provides a discharge control system that can reduce the damage to two groups of interconnected batteries during discharge.

[0027] In order to illustrate the technical solution of the present application, a specific embodiment is provided below for illustration.

[0028] refer to Figures 1 to 3 , Figure 1 and Figure 2 A system schematic diagram of a discharge control system provided by an embodiment of the present application is shown. Figure 3 A circuit diagram of a discharge control system provided by an embodiment of the present application is shown. The discharge control system may include a first battery and a second battery, the first battery and the second battery are connected in parallel and in communication, the first battery includes a first control unit, a first voltage detection unit, a first current detection unit, a first communication unit, a first charging switch, and a first discharging switch, and the second battery includes a second control unit, a second voltage detection unit, a second communication unit, and a second charging switch.

[0029] It should be understood that the first battery and the second battery can be a single battery or a group of batteries composed of multiple batteries. In addition, the first battery and the second battery are of the same type, for example, they can be batteries of the same model.

[0030] Specifically, the first control unit and the second control unit are used to control other components in the corresponding first battery and the second battery to perform corresponding charging control steps. The first voltage detection unit and the second voltage detection unit are used to detect the voltage of the battery. The first current detection unit and the second current detection unit can be used to detect the current in the battery. The first communication unit and the second communication unit are used to realize the communication connection between the two groups of batteries.

[0031] Specifically, the above-mentioned discharge control system can be used to execute the following steps S101 to S108.

[0032] Step S101: a first voltage detection unit is used to obtain a first voltage of a first battery.

[0033] Step S102: The second voltage detection unit is used to obtain a second voltage of the second battery.

[0034] The first voltage is the voltage of the first battery, and the second voltage is the voltage of the second battery.

[0035] In the implementation of the present application, the first battery can detect its own voltage (first voltage) through a built-in first voltage detection unit. Similarly, the second battery can also obtain its own voltage (second voltage).

[0036] Step S103: the second control unit is used to send the second voltage to the first control unit through the second communication unit and the first communication unit.

[0037] In the implementation of the present application, after the two control units obtain their own voltages, they can send their own voltages to the control unit of the other battery through the second communication unit and the first communication unit. Exemplarily, the second battery can send its voltage (second voltage) to the first battery through the second communication unit and the first communication unit, and the first control unit can obtain its own voltage (first voltage) and the voltage of the second battery (second voltage).

[0038] Step S104: the first control unit is used to compare the first voltage and the second voltage.

[0039] In an embodiment of the present application, after obtaining the first voltage and the second voltage, the first control unit may compare the magnitudes of the two voltages through an internal MCU or logic circuit and obtain a comparison result.

[0040] The following are some examples of use scenarios of the embodiments of the present application:

[0041] In some scenarios, the electric car initially purchased by the user is only installed with one set of batteries. After driving the electric car, the user wants to increase the battery life or power of the electric car, so he buys a set of batteries of the same model as the initially installed batteries, and connects the two sets of batteries in parallel to form the above-mentioned first battery and second battery. It is understandable that since the first battery and the second battery are not installed and used at the same time, the power between the two is very likely to be different, which leads to different voltages between the two, so the first voltage of the first battery will be greater than the second voltage of the second battery. Of course, the scenario applicable to the embodiment of the present application is not the above one, but is applicable to all scenarios where two or two sets of batteries are connected in parallel.

[0042] Step S105, when the first voltage is greater than the second voltage, the first control unit is used to turn on the first charging switch of the first battery, and perform current detection on the first battery through the first current detection unit to obtain first current information of the first battery.

[0043] The first charging switch is a switch located on the first battery, which is used to control whether the first battery is charged, and can be a charging MOS. The current information is used to indicate whether there is a charging current in the corresponding battery, so the first current information is used to indicate whether there is a charging current in the first battery at this time.

[0044] It should be understood that, usually, for two batteries of the same type, it can be considered that the charge is proportional to the voltage, that is, if the voltage of one battery is greater than the voltage of the other battery, then it can be considered that the charge of the battery with the higher voltage is greater than the charge of the battery with the lower voltage.

[0045] Based on this, in the embodiment of the present application, when the comparison result is that the first voltage is greater than the second voltage, it can be considered that the power of the first battery is greater than the power of the second battery. At this time, the first control unit can turn on the first charging switch and detect whether there is a charging current (first current information) in the first battery through the first current detection unit.

[0046] Step S106: the first control unit is used to determine the overall usage status of the first battery and the second battery according to the first current information.

[0047] The overall use state may include a charging state and a discharging state. The charging state means that the discharge control system is receiving external power and is in a charging state as a whole. The discharging state means other states other than the charging state, for example, the discharge control system is in a discharging state as a whole, or the discharge control system is in a state of neither charging nor discharging.

[0048] In some specific embodiments of the present application, the first control unit is used to determine the overall usage status of the first battery and the second battery according to the first current information, which may specifically include step S401 or step S402.

[0049] Step S401: when the first current information corresponds to the existence of a charging current, the first control unit is used to determine that the overall usage status of the first battery and the second battery is a charging status.

[0050] In the implementation of the present application, since the voltage of the first battery is greater than the voltage of the second battery, the second battery will not charge the first battery, and at this time there will be no charging current from the second battery in the first battery. Therefore, when the first current information corresponds to the presence of a charging current, the charging current comes from the external power source, thereby determining that the overall use state of the first battery and the second battery is a charging state, that is, connected to an external power source.

[0051] Step S402: when the first current information corresponds to the absence of a charging current, the first control unit is used to determine that the overall usage state of the first battery and the second battery is a discharging state.

[0052] In the implementation mode of the present application, similarly, when the voltage of the first battery is greater than the voltage of the second battery, there will be no charging current from the second battery in the first battery. It should be understood that in the initial state, the charging switch and the discharging switch of the first battery and the second battery are both turned off. Based on this, when the charging switch of the second battery is turned off, if the discharge control system is connected to an external power supply, the charging current should be detected in the first battery at this time. Therefore, when the first current information corresponds to the absence of a charging current, it can be determined that the discharge control system is not connected to an external power supply, that is, the overall use state of the first battery and the second battery is a discharge state.

[0053] Step S107: if it is determined that the overall use state is a discharge state, the first control unit is used to turn on the first discharge switch and send a first control signal to the second control unit through the first communication unit and the second communication unit.

[0054] The first discharge switch is a discharge switch located on the first battery, which is used to control whether the first battery discharges to other devices (such as an electric vehicle motor), and can specifically be a discharge MOS. The first control signal is a signal sent by the first control unit to the second control unit, which is used to control the charging switch and the discharging switch of the second battery.

[0055] After determining that the overall usage state of the first battery and the second battery is the discharge state, since the first voltage of the first battery is greater than the second voltage of the second battery, it can be understood that the power of the first battery is higher than the power of the second battery.

[0056] In order to avoid battery damage caused by the voltage difference between the two groups of batteries during the discharge process, in the embodiment of the present application, after determining that the overall use state is the discharge state, the first control unit turns on the first discharge switch of the first battery, so that the first battery can power the external device. At the same time, the first control unit also sends a first control signal to the second control unit to control the charging switch and the discharging switch of the second battery.

[0057] It is understandable that before executing the above steps S101 to S107, the charging switch and the discharging switch of the first battery can be turned on or off. The charging switch and the discharging switch of the second battery can also be turned on or off. The on and off states of the charging switches and the discharging switches of the first battery and the second battery will not affect the execution of the above steps and subsequent steps.

[0058] Exemplarily, assuming that the initial state of the charging switch of the first battery is turned on, the “first battery turns on the first charging switch of the first battery” in the above step S105 may be to keep the first charging switch in the turned-on state. Also assuming that the initial state of the charging switch of the first battery is turned off, the “first battery turns on the first charging switch of the first battery” in the above step S105 may be to convert the first charging switch from the turned-off state to the turned-on state.

[0059] Step S108: the second control unit is used to turn off the second charging switch and the second discharging switch according to the first control signal.

[0060] The second charging switch is a switch located on the second battery, used to control whether the second battery accepts charging, and can be a charging MOS. The second discharging switch is a switch located on the second battery, used to control whether the second battery discharges externally, and can be a discharging MOS.

[0061] In an embodiment of the present application, after receiving the first control signal, the second control unit can turn off the second charging switch and the second discharging switch of the second battery. On the basis of turning on the first charging switch and the first discharging switch of the first battery in step S107, the second control unit turns off the second charging switch and the second discharging switch. At this time, the second battery will neither receive electrical energy from the first battery or the external power supply, nor discharge to the external device, thereby avoiding simultaneous charging and discharging, and thus avoiding damage to the battery. In addition, when the whole is in a discharging state, the second battery does not discharge, which can narrow the gap in power with the first battery, so as to achieve power balance between the second battery and the first battery as soon as possible.

[0062] Since the second battery turns off the second charging switch, the first battery will not discharge to the second battery additionally, and only needs to discharge to the external device, which can prevent the discharge current from exceeding the rated discharge current and causing damage to the first battery.

[0063] The beneficial effect of the embodiment of the present application compared with the prior art is that when the voltages of the two groups of batteries are different, the embodiment of the present application turns on the charging switch of the high-voltage battery (i.e., the first battery) and detects the current information of the high-voltage battery to determine the overall use status of the two groups of batteries. And when the overall use status is the discharge state, the charging switch and the discharging switch of the high-voltage battery are turned on to realize the discharge of the high-voltage battery to the external device. At the same time, the charging switch and the discharging switch of the second battery are turned off to prevent the low-voltage battery from receiving the electrical energy of the high-voltage battery, thereby avoiding the battery damage caused by the simultaneous charging and discharging of the low-voltage battery. In addition, since the low-voltage charging switch is turned off, the high-voltage battery will not discharge to the low-voltage battery, which can avoid the battery damage caused by the high-voltage battery exceeding the rated discharge current during discharge. That is, the embodiment of the present application can reduce the damage suffered by the two groups of interconnected batteries during discharge.

[0064] In some specific embodiments of the present application, after the second control unit is used to turn off the second charging switch and the second discharging switch according to the first control signal, each component in the system may further perform steps S501 to S503.

[0065] Step S501: the first control unit is used to continuously perform current detection on the first battery through the first current detection unit to obtain second current information of the first battery.

[0066] The second current information is used to indicate whether there is a charging current in the first battery at this time.

[0067] In the implementation of the present application, during the discharge process, the charging switch of the first battery is always turned on, so the first control unit can continuously detect the current of the first battery through the first current detection unit, that is, continuously detect whether there is a charging current in the first battery, and obtain the corresponding second current information. The specific detection process can refer to the above step S105, which will not be repeated here.

[0068] Step S502: the first control unit is used to determine the overall usage status of the first battery and the second battery according to the second current information.

[0069] In the implementation manner of the present application, the specific judgment process can refer to the above-mentioned step S106 and its specific implementation manner, which will not be repeated here.

[0070] Step S503: if it is determined that the overall usage state is a charging state, the first control unit is used to turn off the first charging switch and the first discharging switch, and send a second control signal to the second control unit through the first communication unit and the second communication unit.

[0071] It is understandable that in some usage scenarios, after using the electric vehicle, the user will charge it (that is, charge the discharge control system), and at this time the first battery and the second battery will switch to the charging state.

[0072] In this case (external power supply is connected), the first control unit can detect the charging current and then determine that the overall usage status is the charging state. At this time, the first control unit can turn off its first charging switch and first discharging switch, and send a second control signal to the second control unit to instruct the second control unit to turn on the second charging switch.

[0073] In some specific embodiments of the present application, the second battery further includes a second current detection unit. After sending the second control signal to the second control unit, the components in the system may further perform steps S601 to S604.

[0074] Step S601: the second control unit is used to turn on the second charging switch according to the second control signal.

[0075] In an embodiment of the present application, after receiving the second control signal, the second control unit may turn on the second charging switch of the second battery.

[0076] Step S602: the second control unit is used to perform current detection on the second battery through the second current detection unit to obtain third current information of the second battery.

[0077] In an embodiment of the present application, after the second control unit turns on the second charging switch, it can further detect whether there is a charging current in the second battery, thereby obtaining third current information of the second battery.

[0078] Step S603: the second control unit is used to determine the overall usage status of the first battery and the second battery according to the third current information.

[0079] In the implementation of the present application, for the second battery, on the basis of turning off the first charging switch and the first discharging switch of the first battery, the second battery will not receive electric energy from the first battery. At this time, if a charging current is detected in the second battery, it can be considered that the overall use state of the first battery and the second battery is a charging state. Otherwise, it can be determined that the overall use state of the first battery and the second battery is a discharging state.

[0080] It should be understood that a transient current may be generated inside the battery when it is not charged, or no current may be detected at a certain moment when it is charging, which can easily lead to misjudgment. In the implementation mode of the present application, when the first battery determines that the overall usage status is a charging status, the overall usage status is re-determined by the second battery, which can effectively avoid misjudgment.

[0081] Step S604: if it is determined that the overall usage state is a charging state, the second control unit is used to turn on the second discharge switch.

[0082] In an embodiment of the present application, if the second control unit determines that the overall usage state is the charging state again based on the first control unit determining that the overall usage state is the charging state, the second control unit may turn on the second discharge switch.

[0083] In the embodiment of the present application, after the overall use state of the first battery and the second battery is converted from the discharge state to the charge state, a secondary determination is first performed to avoid misjudgment. When the secondary determination is in the charge state, the second discharge switch of the second battery is turned on to charge the second battery with low power first, so that the power of the second battery is close to that of the first battery, so as to avoid damaging the battery during subsequent charging or use.

[0084] In some usage scenarios, the user just plugs in the charger for the electric vehicle, and the discharge control system is in the charging state, and then quickly unplugs the charger, and the discharge control system is in the discharging state again. Based on this, in some specific embodiments of the present application, after the second control unit is used to determine the overall usage status of the first battery and the second battery according to the third current information, the components in the system can also perform steps S701 to S704.

[0085] Step S701: if it is determined that the overall usage state is a discharging state, the second control unit is used to turn off the second charging switch and send a third control signal to the first control unit through the second communication unit and the first communication unit.

[0086] In an embodiment of the present application, if the second control unit determines that the overall usage state is a discharging state, and the first battery with a high charge needs to be discharged, the second control unit turns off the second charging switch and sends a third control signal to the first control unit through the second communication unit and the first communication unit to instruct the first control unit to turn on its charging switch.

[0087] Step S702: The first control unit is used to turn on the first charging switch according to the third control signal, and perform current detection on the first battery through the first current detection unit to obtain fourth current information of the first battery.

[0088] In an embodiment of the present application, after receiving the third control signal, the first control unit may turn on the first charging switch of the first battery and perform current detection on the first battery to obtain fourth current information of the first battery.

[0089] Step S703: the first control unit is used to determine the overall usage status of the first battery and the second battery according to the fourth current information.

[0090] In the implementation manner of the present application, the specific judgment process can refer to the above-mentioned step S106 and its specific implementation manner, which will not be repeated here.

[0091] Step S704: if it is determined that the overall use state is a discharging state, the first control unit is used to turn on the first discharging switch.

[0092] In an embodiment of the present application, if it is determined after the secondary verification that the overall usage state is a discharging state, the first control unit turns on the first discharging switch to discharge or prepare to discharge the external device.

[0093] In some specific implementations of the present application, after the second control unit is used to turn off the second charging switch and the second discharging switch according to the first control signal, the components in the system may further perform steps S801 to S804.

[0094] Step S801: the first control unit and the second control unit are used to continuously obtain the first voltage and the second voltage.

[0095] In the implementation manner of the present application, the first control unit and the second control unit can continuously monitor their own voltages and obtain the voltage of the other party through the corresponding voltage detection unit and the communication unit.

[0096] Step S802: When the first control unit detects that the first voltage is less than or equal to the second voltage, the first control unit performs current detection on the first battery through the first current detection unit to obtain fifth current information of the first battery.

[0097] It should be understood that when the first control unit detects that the first voltage is less than or equal to the second voltage at a certain moment, it can usually be considered that the power of the first battery is consistent with the power of the second battery at this time. Based on this, the usual practice is to discharge the first battery and the second battery simultaneously from this moment. However, after a lot of research, the applicant found that when the voltage of the first battery decreases from higher than the voltage of the second battery to equal to or lower than the voltage of the second battery, it does not necessarily mean that the power of the first battery is consistent with the power of the second battery. Instead, a "pseudo-balance" phenomenon may occur, that is, when the voltage of the first battery decreases from higher than the voltage of the second battery to equal to or lower than the voltage of the second battery, it is not caused by the power of the first battery decreasing to the same as the power of the second battery, but the first battery has a large voltage change in a short period of time, resulting in a sudden decrease in the detected first voltage, making the second voltage greater than or equal to the second voltage. In fact, the power of the second battery is still lower than the power of the first battery.

[0098] Based on this, in the embodiment of the present application, when the first control unit detects that the first voltage is less than or equal to the second voltage, the first control unit does not immediately turn on the second charging switch and the second discharging switch to enter the discharging state. Instead, the first control unit first performs a current detection on the first battery to obtain the fifth current information of the first battery, thereby verifying whether the power of the second battery is equal to or greater than that of the first battery.

[0099] Step S803: If the fifth current information corresponds to the presence of a charging current, the first control unit is used to keep the first charging switch and the first discharging switch turned on, and send a fourth control signal to the second battery through the first communication unit and the second communication unit.

[0100] In an embodiment of the present application, if the fifth current information corresponds to the presence of a charging current, it can be considered that the charging current is generated by the second battery charging the first battery, which corresponds to the second battery having a higher power than the first battery. At this time, the first control unit keeps turning on the first charging switch and the first discharging switch, and sends a fourth control signal to the second control unit through the first communication unit and the second communication unit.

[0101] Step S804: the second control unit is used to turn on the second charging switch and the second discharging switch according to the fourth control signal.

[0102] In an embodiment of the present application, after receiving the fourth control signal, the second control unit may keep turning on the second charging switch and the second discharging switch of the second battery.

[0103] At this time, the power levels of the first battery and the second battery are equal or substantially close, so that the two batteries are discharged at the same time. No charging current will be generated due to the voltage difference, or the generated charging current will be very small, thus avoiding damage to the batteries.

[0104] In some specific implementations of the present application, after the first current detection unit performs current detection on the first battery to obtain fifth current information of the first battery, the components in the system may further perform step S901 and step S902.

[0105] Step S901, if the fifth current information corresponds to the existence of a non-charging current, the first control unit is used to keep the first charging switch and the first discharging switch turned on, and send a fifth control signal to the second control unit through the first communication unit and the second communication unit.

[0106] In the implementation of the present application, if the fifth current information corresponds to the absence of charging current, it can be considered that the current power level of the second battery is still lower than the power level of the first battery. That is, the phenomenon of detecting that the first voltage is less than or equal to the second voltage is caused by the above-mentioned "pseudo-balance" phenomenon. Therefore, the first control unit still keeps the first charging switch and the first discharging switch turned on, and sends the fourth control signal to the second control unit through the first communication unit and the second communication unit.

[0107] Step S902: the second control unit is used to keep the second charging switch and the second discharging switch closed according to the fifth control signal.

[0108] In the embodiment of the present application, after receiving the fifth control signal, the second control unit keeps the second charging switch and the second discharging switch of the second battery closed, that is, even if the second battery does not enter the discharging state, while the first battery is still discharging, the power difference between the two can be reduced.

[0109] In the embodiment of the present application, after determining that a "pseudo-balance" phenomenon occurs, the charging switch of the second battery is not turned on to prevent the first battery from charging the second battery and causing damage to the battery.

[0110] The above embodiments are all implemented based on the initial detection that the first voltage of the first battery is greater than the second voltage of the second battery. Now, the corresponding embodiment of the initial detection that the first voltage of the first battery is less than the second voltage of the second battery is described. In some embodiments of the present application, the second battery further includes a second current detection unit. After the above second voltage detection unit is used to obtain the second voltage of the second battery, steps S1001 to S1006 may also be included.

[0111] Step S1001, the first control unit is used to send the first voltage to the second control unit through the first communication unit and the second communication unit;

[0112] Step S1002, the second control unit is used to compare the first voltage and the second voltage;

[0113] Step S1003: when the first voltage is less than the second voltage, the second control unit is used to turn on the second charging switch and perform current detection on the second battery to obtain sixth current information of the second battery;

[0114] Step S1004, the second control unit is used to determine the overall usage status of the first battery and the second battery according to the sixth current information;

[0115] Step S1005: if it is determined that the overall use state is a discharge state, the second control unit is used to turn on the second discharge switch and send a fifth control signal to the first control unit through the second communication unit and the first communication unit;

[0116] Step S1006: the first control unit is used to turn off the first charging switch and the first discharging switch according to the fifth control signal.

[0117] In the implementation of the present application, when the first voltage is less than the second voltage, at this time, each component in the second battery can execute the specific implementation method executed by each component in the first battery in steps S102 to S108, and each component in the first battery can execute the specific implementation method executed by each component in the second battery in steps S102 to S108. That is, when the first voltage is less than the second voltage, the steps executed by each component in the second battery are consistent with the steps executed by each component in the first battery when the first voltage is greater than the second voltage. And, when the first voltage is less than the second voltage, the steps executed by each component in the first battery are consistent with the steps executed by each component in the second battery when the first voltage is greater than the second voltage.

[0118] In some specific implementations of the present application, the first voltage detection unit and the second voltage detection unit are both AFE circuits.

[0119] In the implementation of the present application, the AFE circuit is used to detect the voltage of the battery. The AFE circuit combined with the shunt can form a current detection unit in the present application, which is used to detect the current in the battery.

[0120] In some specific implementations of the present application, the first communication unit and the second communication unit are both 485&CAN circuits.

[0121] In the implementation of the present application, the communication unit can use 485 (RS-485) and CAN (Controller Area Network) industrial communication protocols to achieve communication connection between the two groups of batteries. Of course, in addition to the above structure, the first battery and the second battery can also use other structures or circuits to achieve the above functions.

[0122] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0123] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0124] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0125] In the embodiments provided in the present application, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0127] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0128] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0129] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A discharge control system, It is characterized in that The discharge control system includes a first battery and a second battery, the first battery is connected in parallel and in communication connection with the second battery, the first battery includes a first control unit, a first voltage detection unit, a first current detection unit, a first communication unit, a first charging switch, and a first discharging switch, and the second battery includes a second control unit, a second voltage detection unit, a second communication unit, a second charging switch, and a second discharging switch; The first voltage detection unit is used to obtain a first voltage of the first battery; The second voltage detection unit is used to obtain a second voltage of the second battery; The second control unit is used to send the second voltage to the first control unit through the second communication unit and the first communication unit; The first control unit is used to compare the first voltage and the second voltage; When the first voltage is greater than the second voltage, the first control unit is used to turn on a first charging switch of the first battery, and perform current detection on the first battery through the first current detection unit to obtain first current information of the first battery; The first control unit is used to determine the overall usage status of the first battery and the second battery according to the first current information; If it is determined that the overall use state is a discharge state, the first control unit is used to turn on the first discharge switch and send a first control signal to the second control unit through the first communication unit and the second communication unit; The second control unit is used for turning off the second charging switch and the second discharging switch according to the first control signal.

2. The discharge control system according to claim 1, It is characterized in that After the second control unit is used to turn off the second charging switch and the second discharging switch according to the first control signal, the method further includes: The first control unit is used to continuously perform current detection on the first battery through the first current detection unit to obtain second current information of the first battery; The first control unit is used to determine the overall usage status of the first battery and the second battery according to the second current information; If it is determined that the overall usage state is a charging state, the first control unit is used to turn off the first charging switch and the first discharging switch, and send a second control signal to the second control unit through the first communication unit and the second communication unit.

3. The discharge control system according to claim 2, It is characterized in that The second battery further includes a second current detection unit, and after sending the second control signal to the second control unit, further includes: The second control unit is used to turn on the second charging switch according to the second control signal; The second control unit is used to perform current detection on the second battery through the second current detection unit to obtain third current information of the second battery; The second control unit is used to determine the overall usage status of the first battery and the second battery according to the third current information; If it is determined that the overall usage state is a charging state, the second control unit is used to turn on the second discharge switch.

4. The discharge control system according to claim 3, It is characterized in that After the second control unit is used to determine the overall usage status of the first battery and the second battery according to the third current information, the method further includes: If it is determined that the overall usage state is a discharging state, the second control unit is used to turn off the second charging switch and send a third control signal to the first control unit through the second communication unit and the first communication unit; The first control unit is used to turn on the first charging switch according to the third control signal, and perform current detection on the first battery through the first current detection unit to obtain fourth current information of the first battery; The first control unit is used to determine the overall usage status of the first battery and the second battery according to the fourth current information; If it is determined that the overall use state is a discharging state, the first control unit is used to turn on the first discharging switch.

5. The discharge control system according to claim 1, It is characterized in that After the second control unit is used to turn off the second charging switch and the second discharging switch according to the first control signal, the method further includes: The first control unit and the second control unit are used to continuously obtain the first voltage and the second voltage; When the first control unit detects that the first voltage is less than or equal to the second voltage, the first control unit is configured to detect the current of the first battery through the first current detection unit to obtain fifth current information of the first battery; If the fifth current information corresponds to the presence of a charging current, the first control unit is used to keep the first charging switch and the first discharging switch turned on, and send a fourth control signal to the second battery through the first communication unit and the second communication unit; The second control unit is used to turn on the second charging switch and the second discharging switch according to the fourth control signal.

6. The discharge control system according to claim 5, It is characterized in that After the first current detection unit detects the current of the first battery to obtain fifth current information of the first battery, the method further includes: If the fifth current information corresponds to the presence of a non-charging current, the first control unit is used to keep the first charging switch and the first discharging switch turned on, and send a fifth control signal to the second control unit through the first communication unit and the second communication unit; The second control unit is configured to keep the second charging switch and the second discharging switch closed according to the fifth control signal.

7. The discharge control system according to claim 1, It is characterized in that The overall usage status includes a charging status and a discharging status, the current information is used to indicate whether there is a charging current, and the first control unit is used to determine the overall usage status of the first battery and the second battery according to the first current information, including: When the first current information corresponds to the presence of a charging current, the first control unit is used to determine that the overall usage state of the first battery and the second battery is a charging state; When the first current information corresponds to the absence of a charging current, the first control unit is configured to determine that the overall usage state of the first battery and the second battery is a discharging state.

8. The discharge control system according to claim 1, It is characterized in that The second battery further includes a second current detection unit, and after the second voltage detection unit is used to obtain the second voltage of the second battery, further includes: The first control unit is used to send the first voltage to the second control unit through the first communication unit and the second communication unit; The second control unit is used to compare the first voltage and the second voltage; When the first voltage is less than the second voltage, the second control unit is used to turn on the second charging switch and perform current detection on the second battery to obtain sixth current information of the second battery; The second control unit is used to determine the overall usage status of the first battery and the second battery according to the sixth current information; If it is determined that the overall use state is a discharge state, the second control unit is used to turn on the second discharge switch and send a fifth control signal to the first control unit through the second communication unit and the first communication unit; The first control unit is configured to turn off the first charging switch and the first discharging switch according to the fifth control signal.

9. The discharge control system according to any one of claims 1 to 8, It is characterized in that The first voltage detection unit and the second voltage detection unit are both AFE circuits.

10. The discharge control system according to any one of claims 1 to 8, It is characterized in that The first communication unit and the second communication unit are both 485&CAN circuits.

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