Control method of battery pack controller, battery pack controller and electric driving equipment

Abstract

The embodiment of the invention discloses a control method of a battery pack controller, the battery pack controller and electric driving equipment, and the method comprises the steps: responding to the insertion of a charging and discharging gun, and receiving a current working mode sent by charging and discharging equipment; acquiring voltage values of at least two battery packs, and calculating voltage difference values among the battery packs; determining a comparison relationship between the voltage difference value and a preset threshold value; and controlling each battery pack to perform charging and discharging actions according to a set charging and discharging sequence based on the comparison relationship and the current working mode. According to the invention, by determining the voltage difference value between the battery packs and the comparison relationship between the voltage difference value and the preset threshold value, the battery packs are controlled to be charged and discharged according to the set charging and discharging sequence based on the comparison relationship and the current working mode; the technical problems of low charging and discharging efficiency and high labor cost due to the fact that charging and discharging control can only be carried out on a single battery pack in the prior art are solved, and the technical effect that charging and discharging control can be carried out on a plurality of battery packs through one-time gun insertion is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of battery control, and in particular, to a control method for a battery pack controller, a battery pack controller, and an electric driving device. Background Art

[0002] V2G discharge, fully known as Vehicle-to-Grid, refers to the connection of an electric vehicle to a power supply system such as a public grid or a microgrid through a charging and discharging device, and the use of the power battery as a mobile energy storage or controllable load aggregation to participate in the flexible resources of the grid operation, realizing the two-way interaction of energy flow and information flow between the electric vehicle and the grid. The charging and discharging technology of electric vehicles can not only improve the energy utilization efficiency of electric vehicles, but also balance the grid load and promote the utilization of renewable energy.

[0003] However, the existing electric vehicle charging and discharging technology usually can only achieve the charging and discharging control of a single battery pack in the battery system. During V2G discharge, only a single battery pack can be controlled to discharge, with a small discharge power and a short single discharge time; when charging the battery system, it is necessary to manually switch to the second battery pack after the first battery pack is fully charged, which not only increases the labor cost, but also brings great inconvenience to the maintenance of the battery system. Therefore, the charging and discharging control of a single battery pack not only greatly limits the charging and discharging efficiency of electric vehicles, but also consumes more labor costs. Summary of the Invention

[0004] The embodiments of the present invention provide a control method for a battery pack controller, a battery pack controller, and an electric driving device, which solve the technical problems of low charging and discharging efficiency and high labor cost existing in the prior art that only a single battery pack can be charged and discharged.

[0005] The embodiments of the present invention provide a control method for a battery pack controller, and the control method includes:

[0006] In response to the insertion of the charging and discharging gun, receive the current working mode sent by the charging and discharging device;

[0007] Obtain the voltage values of at least two battery packs, and calculate the voltage difference between each of the battery packs;

[0008] Determine the comparison relationship between the voltage difference and a preset threshold;

[0009] Based on the comparison relationship and the current working mode, control each of the battery packs to perform charging and discharging actions in a set charging and discharging order.

[0010] Further, controlling each of the battery packs to perform charging and discharging actions in a set charging and discharging order based on the comparison relationship and the current working mode includes:

[0011] If the comparison relationship is that the voltage difference is greater than the first threshold and the current working mode is the charging mode, then charge each of the battery packs in ascending order of power.

[0012] Further, controlling each of the battery packs to perform charge and discharge actions in a set charge and discharge order based on the comparison relationship and the current working mode includes:

[0013] If the comparison relationship is that the voltage difference is less than or equal to the first threshold and the current working mode is the charging mode, then charge each of the battery packs in a preset number order.

[0014] Further, controlling each of the battery packs to perform charge and discharge actions in a set charge and discharge order based on the comparison relationship and the current working mode includes:

[0015] If the comparison relationship is that the voltage difference is greater than the second threshold and the current working mode is the discharging mode, then control the battery pack with the highest power to discharge first;

[0016] During the discharging process, continuously determine whether the voltage difference is less than the third threshold;

[0017] If the voltage difference is less than the third threshold, then control all the battery packs to discharge simultaneously.

[0018] Further, controlling each of the battery packs to perform charge and discharge actions in a set charge and discharge order based on the comparison relationship and the current working mode includes:

[0019] If the comparison relationship is that the voltage difference is less than or equal to the second threshold and the current working mode is the discharging mode, then directly control all the battery packs to discharge simultaneously.

[0020] Further, obtaining the voltage values of at least two battery packs and calculating the voltage difference between each of the battery packs includes:

[0021] Wake up each of the battery packs and obtain the voltage values of each of the battery packs;

[0022] Subtract the voltage values to obtain the voltage difference.

[0023] An embodiment of the present invention further provides a battery pack controller, which includes a plurality of charge and discharge circuits and a control unit;

[0024] The control unit is electrically connected to the battery packs in the target battery system through the charge and discharge circuits. One charge and discharge circuit is correspondingly connected to one battery pack in the target battery system, and each of the battery packs in the target battery system is connected in parallel through the charge and discharge circuits;

[0025] The control unit is electrically connected to the charging and discharging device through a charging and discharging gun;

[0026] The control unit is configured to obtain the voltage values of the battery packs, calculate the voltage differences between the battery packs, and based on the comparison relationship between the voltage differences and a preset threshold value and the current working mode of the charging and discharging device, control each battery pack to perform charging and discharging actions in a set charging and discharging sequence through the charging and discharging circuit.

[0027] Further, it further includes a plurality of communication interfaces;

[0028] The control unit is respectively communicatively connected to the charging and discharging device and each battery pack through the communication interfaces;

[0029] The control unit obtains the current working mode of the charging and discharging device through the communication interface, and obtains the voltage values of the battery packs through the communication interface.

[0030] Further, the charging and discharging circuit includes a main positive relay, a main negative relay, and a battery pack connection port;

[0031] The battery pack connection port is used to connect the battery pack; the main positive relay is arranged on the positive connection line of the charging and discharging circuit, and the main negative relay is arranged on the negative connection line of the charging and discharging circuit.

[0032] An embodiment of the present invention further provides an electric driving device, and the electric driving device includes the battery pack controller described in any of the above embodiments.

[0033] An embodiment of the present invention discloses a control method for a battery pack controller, a battery pack controller, and an electric driving device. The method includes, in response to the insertion of a charging and discharging gun, receiving the current working mode sent by the charging and discharging device; obtaining the voltage values of at least two battery packs, and calculating the voltage differences between the battery packs; determining the comparison relationship between the voltage differences and a preset threshold value; and based on the comparison relationship and the current working mode, controlling each battery pack to perform charging and discharging actions in a set charging and discharging sequence. By determining the voltage differences between the battery packs and the comparison relationship with the preset threshold value, and controlling each battery pack to perform charging and discharging in a set charging and discharging sequence based on the comparison relationship and the current working mode, the present invention solves the technical problems of low charging and discharging efficiency and high labor cost existing in the prior art where only a single battery pack can be charged and discharged, realizes the technical effect of being able to charge and discharge multiple battery packs with one gun insertion, improves the charging and discharging efficiency, and reduces the labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flowchart of a control method for a battery pack controller provided by an embodiment of the present invention;

[0035] Figure 2 It is a structural diagram of a battery pack controller provided by an embodiment of the present invention. Specific implementation manner

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish different objects, rather than to limit a specific order. Each of the following embodiments of the present invention can be executed independently, and the embodiments can also be combined with each other. The embodiments of the present invention do not make specific limitations in this regard.

[0038] Figure 1 It is a flowchart of a control method of a battery pack controller provided by an embodiment of the present invention.

[0039] As Figure 1 shown, the control method of the battery pack controller specifically includes the following steps:

[0040] S101, in response to the insertion of the charging and discharging gun, receive the current working mode sent by the charging and discharging device.

[0041] Specifically, V2G technology allows electric vehicles to charge when the power grid load is low and the electricity price is low, and store energy for later use; while when the power grid load is high and the electricity price is high, the vehicle discharges to the power grid to realize energy feedback. This technology makes full use of the energy storage capacity of electric vehicles, making them become "energy storage stations" of the power grid, effectively alleviating the supply-demand contradiction of the power grid and improving energy utilization efficiency. When it is necessary to charge and discharge an electric vehicle, only need to insert the charging and discharging gun at the charging and discharging device into the corresponding electric vehicle to realize the charging and discharging operation of the electric vehicle. The user can preset the current working mode on the charging and discharging device, including the charging mode and the discharging mode. After the charging and discharging gun is inserted into the electric vehicle, the battery pack controller can identify the current working mode of the charging and discharging device to control the battery pack to work based on the identified working mode.

[0042] S102, obtain the voltage values of at least two battery packs, and calculate the voltage differences between the battery packs.

[0043] Specifically, a battery system consists of multiple battery packs. In the embodiments of the present invention, a battery system with two battery packs is taken as an example (the same hereinafter). The battery system includes Battery Pack A and Battery Pack B. When the charging and discharging gun is inserted into the electric vehicle, the battery pack controller recognizes that the battery system is about to perform charging and discharging operations and starts to enter the working mode of preparing for charging and discharging. First, it will obtain the voltage values of Battery Pack A and Battery Pack B, and then take the difference between the two voltage values to obtain the voltage difference between Battery Pack A and Battery Pack B.

[0044] S103. Determine the comparison relationship between the voltage difference and the preset threshold.

[0045] Specifically, after obtaining the voltage difference between Battery Pack A and Battery Pack B, use the voltage difference to determine the comparison relationship with the remaining preset thresholds, where the preset thresholds include the thresholds in the charging mode and the discharging mode.

[0046] S104. Control each battery pack to perform charging and discharging actions in a set charging and discharging sequence based on the comparison relationship and the current working mode.

[0047] Specifically, when the power difference between the two battery packs is large, if the remaining power of the battery packs cannot be effectively utilized, it will lead to waste of energy and damage to the battery system. Specifically, if not specified, if the battery with lower power is used for discharging first, the remaining power of the battery pack with higher power will be wasted; or the two battery packs are used for discharging simultaneously, but due to the large difference between the two battery packs, there may be a phenomenon of reverse charging from the high-power battery pack to the low-power battery pack during simultaneous discharging, resulting in an ineffective energy cycle, waste of energy, and reverse charging will also damage the battery and affect the battery life; and when the power difference between the two battery packs is small, if the charging and discharging process of the battery packs cannot be effectively controlled, it may also cause damage to the battery.

[0048] Therefore, in the embodiments of the present invention, by obtaining the comparison relationship between the voltage difference between the two battery packs and the preset threshold, that is, the magnitude of the power difference between the two battery packs, and based on whether the current battery system and the charging and discharging device are in the charging mode or the discharging mode, the charging and discharging sequence of the battery packs is set, and the two battery packs are charged or discharged in the set charging and discharging sequence in turn, so as to achieve the effect that the user can control the charging and discharging of the battery system with multiple battery packs by inserting the charging and discharging gun once, without manually switching the battery packs after one battery pack finishes charging and discharging, nor inserting the charging and discharging gun again to control the charging and discharging of the battery system.

[0049] By determining the voltage difference between battery packs and the comparison relationship with a preset threshold, and controlling the charging and discharging of each battery pack in a set charging and discharging sequence based on the comparison relationship and the current working mode, the present invention solves the technical problems of low charging and discharging efficiency and high labor cost existing in the prior art where only a single battery pack can be controlled for charging and discharging. It achieves the technical effect of being able to control the charging and discharging of multiple battery packs with a single gun insertion, improves the charging and discharging efficiency, and reduces the labor cost.

[0050] Optionally, in S104, controlling the charging and discharging actions of each battery pack in a set charging and discharging sequence based on the comparison relationship and the current working mode specifically includes:

[0051] If the comparison relationship is that the voltage difference is greater than the first threshold and the current working mode is the charging mode, then charge each battery pack in ascending order of power.

[0052] Specifically, the first threshold can be set to 3V as needed. When the voltage difference between battery pack A and battery pack B is greater than 3V, it indicates that the power difference between the two battery packs is relatively large at this time. If the current working mode is the charging mode, then control the battery system to enter the sequential charging mode. In this mode, the battery pack controller will first charge the battery pack with lower power. After the battery pack with lower power is fully charged, without interrupting the charging process, continue to charge the second battery pack, that is, charge the battery pack with higher power. In this mode, a single gun insertion action can be performed, without any intermediate operation, and two battery packs can be fully charged continuously, effectively improving the charging and discharging efficiency, simplifying the charging steps, improving the charging convenience, and reducing the labor cost.

[0053] It should be noted that in the case where the power difference between the two battery packs is relatively large, if the two battery packs are charged simultaneously, on the one hand, the battery pack with lower power will reach the full charge state faster. At this time, if the battery pack with higher power is continued to be charged, the fully charged battery pack with lower power may be overcharged reversely, resulting in the decomposition of the electrolyte in the battery pack and affecting the life of the battery pack. On the other hand, when charging two battery packs with a single charging and discharging gun, the charging power needs to take into account the voltage requirements of both battery packs, so the actual output power is lower than the nominal value, resulting in low charging efficiency. Charging the battery pack with lower power first and then the battery pack with higher power helps to balance the battery packs, avoid overcharging, and effectively protects the life of the battery system.

[0054] Optionally, in S104, controlling the charging and discharging actions of each battery pack in a set charging and discharging sequence based on the comparison relationship and the current working mode specifically further includes:

[0055] If the comparison relationship is that the voltage difference is less than or equal to the first threshold and the current working mode is the charging mode, then charge each battery pack in the preset number sequence.

[0056] Specifically, taking the first threshold value set to 3V as an example, when the voltage difference between battery pack A and battery pack B is less than or equal to 3V, it indicates that the power difference between the two battery packs is small at this time. If the current working mode is the charging mode, no matter which battery pack is charged first, it will not have too much impact on the other battery pack, nor is it easy to affect the balance of the battery pack. Therefore, the battery system can be directly controlled to enter the preset sequential charging mode. In this mode, the battery pack controller charges each battery pack in sequence based on the pre-set number order of each battery pack. Similarly, in this mode, the effect of fully charging two battery packs with one gun insertion action can also be achieved.

[0057] Optionally, S104, controlling each battery pack to perform charge and discharge actions in a set charge and discharge order based on the comparison relationship and the current working mode specifically further includes:

[0058] If the comparison relationship is that the voltage difference is greater than the second threshold value and the current working mode is the discharge mode, then control the battery pack with the highest power to discharge first; during the discharge process, continuously judge whether the voltage difference is less than the third threshold value; if the voltage difference is less than the third threshold value, then control all battery packs to discharge simultaneously.

[0059] Specifically, the second threshold value can be set to 3V or 5V as required. Taking 3V as an example, when the voltage difference between battery pack A and battery pack B is greater than 3V, it indicates that the power difference between the two battery packs is large at this time. If the current working mode is the discharge mode, then control the battery system to enter the sequential discharge mode. In this mode, the battery pack controller will first discharge the battery pack with higher power. During the discharge process of the battery pack with higher power, the battery pack controller will continuously monitor the voltage difference between the two changing battery packs. Assuming that the third threshold value is also set to 3V, when the voltage difference between the two battery packs is less than 3V, close the charge and discharge circuit of the battery pack with lower power, so that the two battery packs can discharge in parallel, improving the discharge efficiency.

[0060] It can be seen that in this mode, it is possible to perform one gun insertion action, without any operation in the middle, to achieve the safe discharge of two battery packs, effectively improving the charge and discharge efficiency, simplifying the discharge steps, improving the discharge convenience, and reducing the labor cost.

[0061] Optionally, S104, controlling each battery pack to perform charge and discharge actions in a set charge and discharge order based on the comparison relationship and the current working mode specifically further includes:

[0062] If the comparison relationship is that the voltage difference is less than or equal to the second threshold value and the current working mode is the discharge mode, then directly control all battery packs to discharge simultaneously.

[0063] Specifically, taking the second threshold value set to 3V as an example, when the voltage difference between battery pack A and battery pack B is less than or equal to 3V, it indicates that the power difference between the two battery packs is small at this time. If the current working mode is the discharge mode, the battery system is directly controlled to enter the simultaneous discharge mode. In this mode, all battery packs are connected in parallel, and the battery pack controller directly controls all battery packs to discharge simultaneously, realizing double-pack parallel discharge with a single gun insertion action, effectively improving the charging and discharging efficiency, simplifying the discharge steps, enhancing the discharge convenience, and reducing the labor cost.

[0064] Optionally, in S102, obtaining the voltage values of at least two battery packs and calculating the voltage differences between the battery packs specifically includes: waking up each battery pack and obtaining the voltage value of each battery pack; taking the difference between the voltage values to obtain the voltage difference.

[0065] Specifically, multiple communication interfaces are provided on the battery pack controller, and each communication interface is correspondingly connected to the internal controller of a battery pack. When the charging and discharging gun is inserted into the electric vehicle, the battery pack controller will be woken up by the charging and discharging device. At this time, the battery pack controller will wake up each battery pack through the communication interface, obtain the voltage value of the battery pack, and calculate the voltage difference for subsequent control of charging and discharging.

[0066] It should be noted that after the battery pack controller wakes up each battery pack through the communication interface, it will not only obtain the voltage values of each battery pack, but also obtain the SOC (State Of Charge) of the battery pack and the insulation detection completion information. The SOC of the battery pack is used to determine the current remaining power of the battery pack, and the insulation detection completion information is used to indicate whether the insulation resistance value of the battery pack is normal.

[0067] In addition, after all battery packs are woken up and the battery pack controller controls each battery pack to enter the corresponding charging and discharging mode based on the judgment of the voltage difference, before controlling each battery pack to perform the charging and discharging action, the battery pack controller will disconnect the wake-up source of the battery pack that does not need to perform the charging or discharging action currently, that is, cut off the communication connection with the battery pack that does not need to perform the charging or discharging action, and wait to wake it up again when the battery pack needs to perform the charging or discharging action subsequently.

[0068] In the embodiments of the present invention, by determining the voltage difference between battery packs and the comparison relationship with a preset threshold, and controlling each battery pack to charge and discharge in a set charge and discharge sequence based on the comparison relationship and the current working mode, the parallel charge and discharge control of multiple battery packs is achieved. During this process, only one gun insertion action is required, and no operation is needed in the middle, which greatly simplifies the operation process, improves the charge and discharge efficiency, and avoids unnecessary labor. By setting different charge and discharge modes, the charge and discharge process of the battery pack is effectively controlled, the remaining power of the battery is fully utilized, the energy utilization efficiency is improved, and the stability of the battery pack during the charge and discharge process is ensured, avoiding overcharging and over-discharging of the battery, thereby extending the service life of the battery.

[0069] The embodiments of the present invention also provide a battery pack controller, which is used to implement the charge and discharge control between the battery system and the charge and discharge device in an electric vehicle. The battery pack controller can be integrated in the battery system as needed, or can be set as a portable control device and connected to the battery system for use when it is necessary to improve the charge and discharge efficiency of the battery system with multiple battery packs.

[0070] Figure 2 It is a structural diagram of a battery pack controller provided by the embodiments of the present invention.

[0071] As Figure 2 shown, the battery pack controller 100 includes a plurality of charge and discharge circuits 11 and a control unit 12;

[0072] The control unit 12 is electrically connected to the battery packs in the target battery system 20 through the charge and discharge circuits 11, Figure 2 In the figure, an example in which there are two battery packs in the target battery system 20 is exemplarily given, namely battery pack A and battery pack B. One charge and discharge circuit 11 is correspondingly connected to one battery pack in the target battery system 20, and the battery packs in the target battery system 20 are connected in parallel through the charge and discharge circuits 11.

[0073] The control unit 12 is electrically connected to the charge and discharge device 30 through a charge and discharge gun; the control unit 12 is used to obtain the voltage values of each battery pack, calculate the voltage difference between each battery pack, and based on the comparison relationship between the voltage difference and the preset threshold and the current working mode of the charge and discharge device 30, control each battery pack to perform charge and discharge actions in a set charge and discharge sequence through the charge and discharge circuits 11.

[0074] Specifically, the control unit 12 can be a BMU (Battery Monitor Unit). See Figure 2, when the charging and discharging gun is inserted into the electric vehicle, the battery pack controller 100 will be awakened by the charging and discharging device 30. Then, the battery pack controller 100 will awaken battery pack A and battery pack B, obtain the voltage values of battery pack A and battery pack B, and then calculate the voltage difference between the two. After obtaining the voltage difference, it will be compared with a preset threshold value to obtain a comparison relationship, and then determine the corresponding charging and discharging mode according to the comparison relationship and the current working mode of the charging and discharging device 30. Finally, the determined charging and discharging mode is used to control the corresponding charging and discharging circuit to be connected or disconnected, so as to control each battery pack to perform charging and discharging actions in a set charging and discharging sequence.

[0075] Optionally, as Figure 2 shown, the battery pack controller 100 further includes a plurality of communication interfaces 13; the control unit 12 is respectively communicatively connected to the charging and discharging device 30 and each battery pack through each communication interface 13;

[0076] The control unit 12 obtains the current working mode of the charging and discharging device 30 through the communication interface 13, and obtains the voltage values of each battery pack through the communication interface 13.

[0077] Specifically, when the charging and discharging gun is inserted into the electric vehicle, the battery pack controller 100 will be awakened by the charging and discharging device 30, and the battery pack controller 100 will obtain the current working mode of the charging and discharging device 30 through the corresponding communication interface 13. After the battery pack controller 100 is awakened, it wakes up battery pack A and battery pack B through the corresponding communication interface 13, obtains the voltage values of battery pack A and battery pack B, and then calculates the voltage difference between the two.

[0078] Optionally, as Figure 2 shown, the charging and discharging circuit 11 includes a main positive relay 41, a main negative relay 42, and a battery pack connection port 43;

[0079] The battery pack connection port 43 is used to connect the battery pack; the main positive relay 41 is arranged on the positive connection line of the charging and discharging circuit 11, and the main negative relay 42 is arranged on the negative connection line of the charging and discharging circuit 11.

[0080] Specifically, referring to Figure 2 , each battery pack is plugged into a battery pack connection port 43 through a high-voltage connector, so as to be connected to a charging and discharging circuit 11. A relay is arranged on each of the positive connection line and the negative connection line of the charging and discharging circuit 11, which are the main positive relay 41 and the main negative relay 42 respectively. The control unit 12 controls the main positive relay 41 and the main negative relay 42 on the corresponding charging and discharging circuit 11 to be closed or opened based on the determined set charging and discharging sequence, so as to control the charging and discharging sequence of each battery pack.

[0081] Next, a specific embodiment will be used to illustrate the working principle of the battery pack controller.

[0082] See Figure 2 After the control unit 12 is awakened by the external charging and discharging device 30, it synchronously awakens battery pack A and battery pack B in the target battery system 20 by outputting a wake-up signal, and obtains the SOC, voltage value, and insulation detection completion information of the battery pack through the charging and discharging protocol, and calculates the voltage difference between battery pack A and battery pack B. The control unit 12 receives the current working mode reported by the charging and discharging device 30, and determines to enter different charging and discharging modes based on the voltage difference and the current working mode.

[0083] Exemplarily, if the voltage value U of battery pack A A is greater than the voltage value U of battery pack B B , and the voltage difference is greater than 3V, if the current working mode is the charging mode, the wake-up source of battery pack B is disconnected, the main positive relay 41 and the main negative relay 42 on the charging and discharging loop 11 corresponding to battery pack A are closed, and battery pack A is charged. When battery pack A is fully charged (at this time the total voltage is U1), the control unit 12 controls the external charging and discharging device 30 to output a voltage of U1 and a current of 0 through a message, then disconnects the main positive relay 41 and the main negative relay 42 corresponding to battery pack A, then wakes up battery pack B, and closes the main positive relay 41 and the main negative relay 42 corresponding to battery pack B. Finally, the charging and discharging device 30 is adjusted through a message to output the charging voltage and current required by battery pack B until battery pack B is also fully charged, and then the charging ends.

[0084] If U A >U B , and the voltage difference is greater than 5V, if the current working mode is the discharging mode, the wake-up source of battery pack B is disconnected, the main positive relay 41 and the main negative relay 42 on the charging and discharging loop 11 corresponding to battery pack A are closed, and battery pack A is controlled to discharge. At this time, the maximum allowable output power to the outside is Pa. When the total voltage of battery pack A is U B ±5V, it indicates that the voltage difference between battery pack A and battery pack B is less than or equal to 5V at this time. At this time, the control unit 12 wakes up battery pack B, and closes the main positive relay 41 and the main negative relay 42 corresponding to battery pack B, and enters the parallel-pack discharging mode. At this time, the maximum allowable output power to the outside is Pa + Pb.

[0085] If the voltage difference between the voltage value U of battery pack A A and the voltage value U of battery pack B B is not greater than 5V, then the control unit 12 directly controls the main positive relay 41 and the main negative relay 42 corresponding to battery pack A and battery pack B to be closed, and directly enters the parallel-pack discharging mode.

[0086] The battery pack controller provided by the embodiment of the present invention uses the control method of the battery pack controller in the above embodiment. Therefore, the battery pack controller provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be elaborated here.

[0087] The embodiment of the present invention also provides an electric driving device, which includes the battery pack controller in any of the above embodiments.

[0088] The electric driving device provided by the embodiment of the present invention includes the battery pack controller in the above embodiment. Therefore, the electric driving device provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be elaborated here.

[0089] In the description of the embodiment of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0090] Finally, it should be noted that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for a battery pack controller, characterized in that: The control method comprises: In response to the charging and discharging gun being inserted, receiving the current working mode sent by the charging and discharging device; Obtaining voltage values ​​of at least two battery packs, and calculating a voltage difference between the battery packs; Determining a comparison relationship between the voltage difference and a preset threshold value; Based on the comparison relationship and the current working mode, each battery pack is controlled to perform charging and discharging operations in a set charging and discharging sequence.

2. The control method of the battery pack controller according to claim 1, characterized in that: Controlling each of the battery packs to perform charging and discharging actions in a set charging and discharging sequence based on the comparison relationship and the current working mode includes: If the comparison relationship is that the voltage difference is greater than the first threshold value, and the current working mode is the charging mode, then each of the battery packs is charged in order from low to high power.

3. The control method of the battery pack controller according to claim 2, characterized in that: Controlling each of the battery packs to perform charging and discharging actions in a set charging and discharging sequence based on the comparison relationship and the current working mode includes: If the comparison relationship is that the voltage difference is less than or equal to the first threshold, and the current working mode is a charging mode, each of the battery packs is charged according to a preset number sequence.

4. The control method of the battery pack controller according to claim 1, characterized in that: Controlling each of the battery packs to perform charging and discharging actions in a set charging and discharging sequence based on the comparison relationship and the current working mode includes: If the comparison relationship is that the voltage difference is greater than a second threshold value, and the current working mode is a discharge mode, the battery pack with the highest power is controlled to discharge first; During the discharge process, determining in real time whether the voltage difference is less than a third threshold; If the voltage difference is less than the third threshold, all the battery packs are controlled to discharge simultaneously.

5. The control method of the battery pack controller according to claim 4, characterized in that: Controlling each of the battery packs to perform charging and discharging actions in a set charging and discharging sequence based on the comparison relationship and the current working mode includes: If the comparison relationship is that the voltage difference is less than or equal to the second threshold value, and the current working mode is the discharge mode, all the battery packs are directly controlled to discharge simultaneously.

6. The control method of the battery pack controller according to claim 1, characterized in that: Obtaining voltage values ​​of at least two battery packs and calculating a voltage difference between the battery packs includes: Waking up each of the battery packs and acquiring the voltage value of each of the battery packs; The voltage values ​​are subtracted to obtain the voltage difference value.

7. A battery pack controller, characterized in that: The battery pack controller includes multiple charging and discharging circuits and a control unit; The control unit is electrically connected to the battery pack in the target battery system through the charge and discharge circuit, one charge and discharge circuit is correspondingly connected to one battery pack in the target battery system, and the battery packs in the target battery system are connected in parallel through the charge and discharge circuit; The control unit is electrically connected to the charging and discharging device via a charging and discharging gun; The control unit is used to obtain the voltage value of each battery pack, calculate the voltage difference between each battery pack, and based on the comparison relationship between the voltage difference and a preset threshold value and the current working mode of the charging and discharging device, control each battery pack through the charging and discharging circuit to perform charging and discharging actions in a set charging and discharging order.

8. The battery pack controller according to claim 7, characterized in that: It also includes multiple communication interfaces; The control unit is respectively connected to the charging and discharging device and each of the battery packs through the communication interfaces; The control unit obtains the current working mode of the charging and discharging device through the communication interface, and obtains the voltage value of each battery pack through the communication interface.

9. The battery pack controller according to claim 8, characterized in that: The charging and discharging circuit includes a main positive relay, a main negative relay and a battery pack connection port; The battery pack connection port is used to connect the battery pack; The main positive relay is arranged on the positive electrode connection line of the charging and discharging circuit, and the main negative relay is arranged on the negative electrode connection line of the charging and discharging circuit.

10. An electric driving device, characterized in that: The electric driving device includes the battery pack controller described in any one of claims 7 to 9.

Images