Charging method, device, vehicle, medium and program product

Abstract

The present disclosure relates to a charging method, device, vehicle, medium and program product, comprising: in response to establishing a connection with a charging device, determining a target charging voltage of an accessed battery pack, the target charging voltage being determined according to battery information of the accessed battery pack and battery information of a target battery pack; and charging the target battery pack and the accessed battery pack according to the target charging voltage after parallel connection of the target battery pack. The impact on the target battery pack during parallel connection can be reduced, and the safety of vehicle charging can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicle charging, and in particular to a charging method and device, a vehicle, a medium and a program product. BACKGROUND

[0002] A new energy vehicle is equipped with a power battery. The power battery can receive and store electric energy provided by a charging pile, and release the stored electric energy to drive the vehicle to travel during the vehicle travel. However, the charging speed of the new energy vehicle is slow, which leads to a much longer waiting time for charging than the refueling time of a traditional vehicle, affecting the user experience. In order to improve the charging speed and improve the user experience, the battery voltage can be increased, for example, a high-voltage power battery of 800V is used, so that a higher charging voltage is used for charging. SUMMARY

[0003] To overcome the problems in the related art, the present disclosure provides a charging method and device, a vehicle, a medium and a program product.

[0004] According to a first aspect of an embodiment of the present disclosure, a charging method is provided, comprising:

[0005] In response to establishing a connection with the charging device, determining a target charging voltage of the accessed battery pack, the target charging voltage being determined according to battery information of the accessed battery pack and battery information of a target battery pack, the target battery pack being at least one of the un-parallelly connected battery packs;

[0006] According to the target charging voltage, after parallelly connecting the target battery pack, charging the target battery pack and the accessed battery pack.

[0007] The above technical solution determines the target charging voltage of the accessed battery pack according to the battery information of the accessed battery pack and the battery information of the target battery pack, shortens the charging time of the double battery pack or two or more battery packs before parallel connection, and charges the target battery pack and the accessed battery pack after parallel connection of the target battery pack according to the target charging voltage, thereby reducing the impact on the target battery pack during parallel connection and improving the safety of vehicle charging.

[0008] In some possible implementation manners, the determination of the target charging voltage of the accessed battery pack comprises:

[0009] Obtaining tolerance information of a switch device corresponding to the target battery pack, the switch device being a device for opening or closing a charging circuit of the target battery pack;

[0010] According to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack, determining the target charging voltage of the accessed battery pack.

[0011] The technical solution above determines the target charging voltage of the accessed battery pack according to the tolerance information of the switch device corresponding to the target battery pack, the battery information of the accessed battery pack and the battery information of the target battery pack, so that the charging strategy is more accurate and efficient. It can ensure that the accessed battery pack can reach a safe and efficient charging voltage as soon as possible before parallel connection, thereby shortening the charging time of double battery packs or multiple battery packs before parallel connection and improving the charging efficiency.

[0012] In some possible implementation manners, the determining of the target charging voltage of the accessed battery pack according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack includes:

[0013] determining a matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack;

[0014] determining the target charging voltage of the accessed battery pack according to the matching voltage difference value and the terminal voltage in the battery information of the target battery pack.

[0015] The technical solution above determines the matching voltage difference value according to the tolerance information of the switch device, the battery information of the accessed battery pack and the battery information of the target battery pack, which can accurately calculate the voltage difference threshold that the two battery packs should reach before parallel connection. This helps to avoid parallel connection impact caused by excessive voltage difference and ensures smooth charging process. The target charging voltage of the accessed battery pack is determined based on the matching voltage difference value and the terminal voltage. This ensures that the setting of the target charging voltage considers both the voltage matching between battery packs and the current charging state of the target battery pack, thereby achieving more scientific and reasonable charging voltage setting.

[0016] In some possible implementation manners, the battery information includes resistance information, and the determining of the matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack includes:

[0017] determining parallel resistance information according to the resistance information of the accessed battery pack and the resistance information of the target battery pack;

[0018] determining the matching voltage difference value according to the parallel resistance information and the tolerance information.

[0019] The technical solution can obtain the resistance information of the accessed battery pack and the target battery pack, and calculate the parallel resistance information according to the resistance information, so that the electrical characteristics of the battery pack in the parallel state can be more accurately understood. After obtaining the parallel resistance information, the matching voltage difference is determined in combination with the tolerance information of the switch device. The bearing capacity of the switch device in the parallel connection process is fully considered, so that the setting of the matching voltage difference can neither be too large to cause damage to the switch device, nor be too small to affect the charging efficiency.

[0020] In some possible implementations, the tolerance information includes an upper limit of a tolerance current.

[0021] The technical solution can determine the matching voltage difference by using the upper limit of the tolerance current, which can help to reduce current fluctuations and abnormal phenomena in the charging process, thereby enhancing stability. The stable charging process not only improves the charging efficiency, but also reduces the device failure rate caused by abnormal current.

[0022] In some possible implementations, the method further includes:

[0023] determining target charging information according to the target charging voltage and an end voltage in the battery information of the accessed battery pack;

[0024] charging the accessed battery pack according to the target charging information.

[0025] The technical solution can determine the target charging information by combining the target charging voltage and the end voltage information of the accessed battery pack, so that individual charging control can be performed according to the specific state of each battery pack. This can help to ensure that the battery pack is always in the best state during the charging process, improve the charging efficiency, shorten the charging time, and avoid overcharging or undercharging.

[0026] In some possible implementations, the determination of the target charging information according to the target charging voltage and the end voltage in the battery information of the accessed battery pack includes:

[0027] determining a charging period and a target charging end voltage corresponding to each charging period according to the target charging voltage and the end voltage in the battery information of the accessed battery pack;

[0028] determining the target charging information according to the charging period and the target charging end voltage corresponding to each charging period.

[0029] The technical scheme realizes segmented control of the charging process by determining the charging period and the charging terminal voltage corresponding to each charging period according to the target charging voltage and the terminal voltage of the accessed battery pack. The segmented control strategy can meet the needs of the battery pack in different power stages, improve the charging accuracy, and ensure that the battery pack is always in the best state during the charging process. This helps to optimize the charging efficiency.

[0030] In some possible implementations, the charging the accessed battery pack according to the target charging information includes:

[0031] determining a terminal voltage error between the actual charging terminal voltage of the accessed battery pack after completion of each charging period and the corresponding target charging terminal voltage;

[0032] determining a cumulative current error of the accessed battery pack after completion of each charging period;

[0033] determining a target charging current of a next charging period according to the terminal voltage difference and the cumulative current error;

[0034] charging the accessed battery pack according to the target charging current of the next charging period.

[0035] The technical scheme realizes real-time monitoring of the charging process by calculating the terminal voltage error between the actual charging terminal voltage and the target charging terminal voltage and the cumulative current error after completion of each charging period. Deviation in the charging process can be found in time, and the charging accuracy and efficiency are improved. The target charging current of the next charging period is determined based on the terminal voltage error and the cumulative current error, so that the charging process is more accurate. The size of the charging current can be dynamically adjusted to compensate for previous errors, improve the charging efficiency, and ensure that the battery pack can complete charging according to the predetermined target charging information, thereby improving the charging accuracy and reliability.

[0036] In some possible implementations, the determining the target charging current of the next charging period according to the terminal voltage difference and the cumulative current error includes:

[0037] determining a proportional response current according to the terminal voltage difference and a proportional coefficient;

[0038] determining an integral response current according to the cumulative current error and an integral coefficient;

[0039] determining the target charging current of the next charging period according to the proportional response current and the integral response current.

[0040] The technical scheme can convert the terminal voltage difference into a proportional response current through a proportional coefficient, can instantly perceive the deviation of the actual voltage of the current charging period from the target voltage, and rapidly adjust the charging current. The fast response mechanism effectively shortens the adjustment time of the charging process, avoids the reduction of charging efficiency or damage to the battery caused by voltage deviation, and the introduction of the integral response current can compensate for the accumulated current error. The integral coefficient can quantify the cumulative effect of historical errors, which can gradually correct the deviation caused by parameter drift or external interference in the long-term charging process, and ensure that the charging current is always close to the target value. The dynamic response and steady-state accuracy are optimized.

[0041] In some possible implementations, the charging the target battery pack and the accessed battery pack after the target battery pack is connected in parallel includes:

[0042] In a case where the charging of the accessed battery pack reaches the target charging voltage, the switch device corresponding to the target battery pack is controlled to be closed, and in a closed state, the charging loop of the target battery pack is connected in parallel to the charging device through the switch device;

[0043] The target battery pack and the accessed battery pack are charged after the target battery pack is connected in parallel.

[0044] The technical scheme can quickly connect the charging loops of multiple battery packs in parallel to the charging device by controlling the switch device corresponding to the target battery pack to be closed. The parallel connection mechanism can match the charging capacity of the charging device, and can connect multiple battery packs in parallel to allow the charging device to provide current to multiple battery packs at the same time, thereby avoiding the reduction of overall charging efficiency caused by the limitation of a single battery pack in series charging.

[0045] In some possible implementations, the determining the target charging voltage of the accessed battery pack in response to establishing a connection with the charging device includes:

[0046] In response to establishing a connection with the charging device, output charging information of the charging device is obtained.

[0047] If the output charging information does not meet the series charging condition, the target charging voltage of the accessed battery pack is determined.

[0048] The technical scheme can automatically determine whether the current charging device meets the series charging condition by responding to the connection with the charging device and obtaining the output charging information of the charging device. If the series charging condition is not met, parallel charging can be performed, thereby improving the charging flexibility.

[0049] In some possible implementations, the method further includes:

[0050] In a case where the output charging information meets the series charging condition, the plurality of battery packs are controlled to be connected in series for charging.

[0051] The above technical solution realizes comprehensive improvement of charging efficiency, resource utilization rate and energy utilization rate by dynamically controlling the battery packs to be connected in series when the series charging condition is met.

[0052] According to a second aspect of the embodiments of the present disclosure, a charging device is provided, comprising:

[0053] A determination module is configured to determine a target charging voltage of an accessed battery pack in response to establishing a connection with the charging device, the target charging voltage being determined according to battery information of the accessed battery pack and battery information of a target battery pack, the target battery pack being at least one of the battery packs not connected in parallel;

[0054] A charging module is configured to charge the target battery pack and the accessed battery pack after connecting the target battery pack in parallel according to the target charging voltage.

[0055] In some possible implementation manners, the determination module comprises:

[0056] An acquisition sub-module is configured to acquire tolerance information of a switching device corresponding to the target battery pack, the switching device being a device for opening or closing a charging loop of the target battery pack;

[0057] A voltage determination sub-module is configured to determine the target charging voltage of the accessed battery pack according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack.

[0058] In some possible implementation manners, the voltage determination sub-module is configured to:

[0059] determine a matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack;

[0060] determine the target charging voltage of the accessed battery pack according to the matching voltage difference value and an end voltage in the battery information of the target battery pack.

[0061] In some possible implementation manners, the battery information comprises resistance information, and the voltage determination sub-module is configured to:

[0062] determine parallel resistance information according to resistance information of the accessed battery pack and resistance information of the target battery pack;

[0063] determine the matching voltage difference value according to the parallel resistance information and the tolerance information.

[0064] In some possible implementation manners, the charging module comprises:

[0065] The determining sub-module is configured to determine target charging information according to the target charging voltage and an end voltage in battery information of the accessed battery pack.

[0066] The charging sub-module is configured to charge the accessed battery pack according to the target charging information.

[0067] In some possible implementation manners, the determining sub-module is configured to:

[0068] determine a charging period and a target charging end voltage corresponding to each charging period according to the target charging voltage and the end voltage in the battery information of the accessed battery pack.

[0069] determine the target charging information according to the charging period and the target charging end voltage corresponding to each charging period.

[0070] In some possible implementation manners, the charging sub-module is configured to:

[0071] determine an end voltage error between an actual charging end voltage of the accessed battery pack and the target charging end voltage corresponding to each charging period after completion of charging of each charging period;

[0072] determine a cumulative current error of the accessed battery pack after completion of charging of each charging period;

[0073] determine a target charging current of a next charging period according to the end voltage error and the cumulative current error;

[0074] charge the accessed battery pack according to the target charging current of the next charging period.

[0075] In some possible implementation manners, the charging sub-module is configured to:

[0076] determine a proportional response current according to the end voltage error and a proportional coefficient;

[0077] determine an integral response current according to the cumulative current error and an integral coefficient;

[0078] determine the target charging current of the next charging period according to the proportional response current and the integral response current.

[0079] In some possible implementation manners, the charging module comprises:

[0080] controlling a switch device corresponding to the target battery pack to be closed, the switch device being in a closed state to connect a charging loop of the target battery pack in parallel to the charging device for charging.

[0081] In some possible implementation manners, the determining module is configured to:

[0082] in response to establishing a connection with the charging device, obtaining output charging information of the charging device;

[0083] if the output charging information does not satisfy a series charging condition, determining the target charging voltage of the battery pack that has been connected.

[0084] In some possible implementation manners, the charging module is further configured to:

[0085] in a case where the output charging information satisfies the series charging condition, controlling a plurality of the battery packs to be connected in series for charging.

[0086] According to a third aspect of the embodiments of the present disclosure, a vehicle is provided, comprising:

[0087] a processor;

[0088] a memory for storing processor-executable instructions;

[0089] The processor is configured to execute the executable instructions stored in the memory to implement the method in any of the first aspect.

[0090] According to a fourth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps of the method in any of the first aspect.

[0091] According to a fifth aspect of the embodiments of the present disclosure, a computer program product is provided, comprising a computer program, and the computer program is executed by a processor to implement the steps of the method in any of the first aspect.

[0092] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0093] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure, together with the description.

[0094] Figure 1 is a flowchart of a charging method according to an exemplary embodiment.

[0095] Figure 2is a circuit diagram of a charging circuit of a dual battery pack according to an example embodiment.

[0096] Figure 3 is a flowchart of a method of implementing Figure 1 is a flowchart of step S11 in the method.

[0097] Figure 4 is a flowchart of another charging method according to an example embodiment.

[0098] Figure 5 is a block diagram of a charging device according to an example embodiment.

[0099] Figure 6 is a block diagram of a vehicle according to an example embodiment. DETAILED DESCRIPTION

[0100] The example embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, the same numbers refer to the same or similar elements throughout the drawings. The implementations described in the following example embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0101] It should be noted that all actions of obtaining signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection regulations of the country where the device is located, and with the authorization given by the owner of the corresponding device.

[0102] In order to improve the charging speed and enhance the user's driving experience, a higher charging voltage is used by increasing the battery voltage, for example, using an 800V high-voltage power battery, so that a higher charging voltage is used for charging. However, the maximum battery voltage of the power battery is 800V, and the required charging voltage may exceed 800V, while the output voltage of most direct current fast charging piles is only 500V, which results in that this part of the charging pile cannot directly charge the vehicle configured with an 800V high-voltage power battery, which is not conducive to improving the user experience.

[0103] In this case, a voltage boosting device can be added to the vehicle to boost the 500V voltage provided by the charging pile to 800V required by the power battery. However, the addition of the voltage boosting device not only increases the production cost of the vehicle, but also affects the arrangement of various devices on the vehicle, causing space congestion, thereby causing problems such as poor heat dissipation.

[0104] The battery pack can also be divided into two banks. When a charging pile with a charging voltage higher than the required charging voltage of the battery pack is encountered, the two banks are connected in series. For example, when a charging pile with a charging voltage of 1000V is encountered, the two banks are connected in series to form a 800V voltage platform, so that charging through the charging pile with a high charging voltage can be realized. When a charging pile with a charging voltage lower than the required charging voltage of the battery pack is encountered, the two banks are connected in parallel. At this time, the battery pack is connected in parallel to form a 400V voltage platform, so that charging through the charging pile with a low charging voltage can be realized.

[0105] However, when the 800V vehicle with double battery packs accesses the 500V charging pile, if there is a relatively large voltage difference (for example, the voltage difference is greater than 10V) between the two battery banks, the low-voltage battery bank needs to be charged first, and then the relay on the high-voltage battery charging circuit is closed to realize simultaneous charging of the two battery banks.

[0106] For example, a small enough charging current is used to charge the low-voltage battery bank, so that the terminal voltage of the low-voltage battery bank can be regarded as the electromotive force of the low-voltage battery bank. When the terminal voltage of the low-voltage battery bank approaches the electromotive force of the high-voltage battery bank (for example, the parallel closing threshold is less than 2V), the relay on the high-voltage battery charging circuit is closed.

[0107] In order to know the electromotive force of Bank1 at all times, the current used can only be very small, such as 1 / 10C (C is the capacity of the battery pack) current to charge the low-voltage battery bank. At this time, the terminal voltage of the low-voltage battery bank can be regarded as the electromotive force of the low-voltage battery bank. Then it will take a very long time to eliminate the voltage difference of about 8V, which will seriously deteriorate the customer's charging experience. If the parallel closing threshold is increased, although the time required to eliminate the voltage difference can be shortened, the impact current during parallel connection can easily damage the relay on the high-voltage battery charging circuit, causing the relay to stick and fail.

[0108] Therefore, the present disclosure provides a charging method, which aims to shorten the charging time of two or more battery banks before parallel connection, reduce the impact current on the relay during parallel connection, and improve the safety of vehicle charging.

[0109] Figure 1 is a flow chart of a charging method according to an exemplary embodiment, as shown in Figure 1 includes the following steps.

[0110] In step S11, in response to establishing a connection with the charging device, the target charging voltage of the accessed battery pack is determined.

[0111] The target charging voltage is determined according to battery information of the accessed battery pack and battery information of the target battery pack, and the target battery pack is at least one of the battery packs not connected in parallel to the accessed battery pack.

[0112] The charging device can be a device providing charging electric energy to the electric equipment. In the example that the vehicle establishes electrical connection with the charging device through the charging gun, the charging device is a charging pile. In the embodiment of the present disclosure, the charging pile can be a device converting alternating current into direct current (i.e., a direct current charging pile) or directly providing alternating current (i.e., an alternating current charging pile).

[0113] In the embodiment of the present disclosure, the accessed battery pack is a battery pack that has established electrical connection with the charging device for charging among a plurality of battery packs. The accessed battery pack can be one or more. After the plurality of accessed battery packs are connected in series or in parallel, the battery packs are connected to the charging device for battery pack charging. The target battery pack is a battery pack that is about to be connected to the accessed battery pack in parallel for charging.

[0114] For example, when the vehicle is configured with two battery packs (i.e., double-bank battery packs), the battery pack Bank1 can be the accessed battery pack, and the battery pack Bank2 can be the target battery pack. When the vehicle is configured with three battery packs, the battery pack Bank1 and the battery pack Bank2 can be connected in parallel or in series and then electrically connected to the charging device, and the battery pack Bank3 can be the target battery pack.

[0115] It can be explained that the terminal voltage of the accessed battery pack is less than the terminal voltage of the target battery pack. For example, the battery pack Bank1 is the accessed battery pack, and the battery pack Bank2 is the target battery pack. The terminal voltage of the battery pack Bank1 is less than the terminal voltage of the battery pack Bank2. Similarly, the terminal voltage of the battery pack Bank1 and the battery pack Bank2 connected in parallel or in series is less than the terminal voltage of the battery pack Bank3.

[0116] The target charging voltage is the voltage of the accessed battery pack reaching the voltage and then connecting the target battery pack in parallel. For example, the battery pack Bank1 is the accessed battery pack, and the target charging voltage is 380V. When the battery pack Bank1 is charged to 380V, the battery pack Bank2 is connected in parallel.

[0117] The parallel connection is a connection mode that the anodes of the plurality of battery packs are connected to the anodes, and the cathodes are connected to the cathodes. After the parallel connection, the total voltage of the battery pack group remains unchanged, and the total capacity is equal to the sum of the capacities of the battery packs.

[0118] In the embodiments of the present disclosure, when the electric vehicle establishes an electrical connection with the charging pile, the battery management system on the vehicle can communicate with the charging pile to exchange information. The battery management system first acquires the output charging information of the charging pile and the input charging information of the battery pack, and then determines the battery pack to be connected to the charging pile first from the multiple battery packs in the case that the output charging information of the charging pile cannot meet the input charging information of the battery pack, and then charges the battery pack connected to the charging pile, and then determines the target charging voltage.

[0119] In step S12, according to the target charging voltage, the target battery pack is connected in parallel, and the target battery pack and the connected battery pack are charged.

[0120] In the embodiments of the present disclosure, in the case that the connected battery pack is charged to the target charging voltage, the target battery pack is connected in parallel, and the target battery pack and the connected battery pack are charged simultaneously after the target battery pack is connected in parallel.

[0121] Referring to Figure 2 As shown in the figure, the electromotive force, internal resistance, terminal voltage, and branch current of Bank 1 are respectively: , , , The electromotive force, internal resistance, terminal voltage, and branch current of Bank 2 are respectively: , , , Before Bank 2 is closed, the electromotive force and terminal voltage of Bank 2 are respectively: , Then at this time The electromotive force of Bank 1 is lower than that of Bank 2 at the beginning: The current direction: positive for charging and negative for discharging relative to the battery pack, K1 is closed first, at this time the charging pile charges the battery pack Bank 1 with I1, in the case that the terminal voltage or electromotive force of the battery pack Bank 1 reaches the target charging voltage, K2 is closed, the charging pile charges the battery pack Bank 1 with I1 and charges the battery pack Bank 2 with I2 at the same time.

[0122] The above technical solution determines the target charging voltage of the connected battery pack according to the battery information of the connected battery pack and the battery information of the target battery pack, shortens the charging time of the double battery pack or two or more battery packs before parallel connection, charges the target battery pack and the connected battery pack after the target battery pack is connected in parallel according to the target charging voltage, reduces the impact on the target battery pack during parallel connection, and improves the safety of vehicle charging.

[0123] In some possible implementation manners, referring to Figure 3 In step S11, the target charging voltage of the accessed battery pack is determined, including:

[0124] In step S111, the tolerance information of the switch device corresponding to the target battery pack is acquired, the switch device being a device for opening or closing the charging circuit of the target battery pack.

[0125] The switch device is a component for controlling opening or closing of the charging circuit of the battery pack in the charging circuit of the battery pack. For example, the switch device can be a relay, a contactor, etc., and can change its conduction state through an electrical signal, thereby realizing control over the charging circuit of the battery pack. The tolerance information is related information such as a range of electrical parameters that the switch device can withstand, mainly including a maximum withstand voltage, a maximum withstand current, etc.

[0126] In the embodiments of the present disclosure, each battery pack is equipped with a corresponding switch device for controlling opening and closing of the charging circuit thereof. When the target battery pack is determined, the battery management system communicates with the switch devices to acquire the tolerance information thereof.

[0127] For example, the switch device usually has some sensors or storage chips integrated therein for recording and transmitting information such as the maximum withstand voltage and the maximum withstand current thereof. The battery management system sends a request instruction to the switch device through a specific communication protocol (such as a CAN bus protocol), and the switch device feeds back the tolerance information thereof to the battery management system after receiving the instruction.

[0128] In step S112, the target charging voltage of the accessed battery pack is determined according to the tolerance information, the battery information of the accessed battery pack, and the battery information of the target battery pack.

[0129] In the embodiments of the present disclosure, after the tolerance information of the switch device, the battery information of the accessed battery pack, and the battery information of the target battery pack are acquired, a preset algorithm and charging strategy are used to determine the target charging voltage.

[0130] In the embodiments of the present disclosure, the target charging voltage is a voltage between the current terminal voltage of the accessed battery pack and the terminal voltage of the target battery pack. Moreover, the target charging voltage is a voltage infinitely close to the terminal voltage of the target battery pack, that is, in combination with Figure 2 Only when the voltage reached by the battery pack 1 in charging infinitely approaches the terminal voltage U 20 of the battery pack Bank2, the current impact on the relay k2 can be reduced, thereby protecting the relay k2.

[0131] In order to reduce the influence of the instantaneous impact current on the target battery pack or the switch device on the charging loop of the target battery pack when the target battery pack is connected in parallel, and to quickly calculate, the corresponding tolerance information can be calibrated in advance when different battery packs are taken as the target battery pack. Generally, the smaller the tolerance value (such as the impact current) represented by the calibrated tolerance information is, the better, and the tolerance value can be determined according to the bearing capacity of the switch device.

[0132] The technical solution described above can obtain the tolerance information of the switch device corresponding to the target battery pack, so that the system can consider the bearing capacity of the switch device during parallel connection, and ensure that the switch device will not be damaged due to excessive voltage or current impact during parallel connection, thereby improving compatibility and safety. Furthermore, the target charging voltage is determined in combination with the tolerance information of the switch device, the battery information of the accessed battery pack, and the battery information of the target battery pack, so that the charging strategy is more accurate and efficient. It can be ensured that the accessed battery pack can reach a safe and efficient charging voltage as soon as possible before parallel connection, thereby shortening the charging time of double battery packs or multiple battery packs before parallel connection and improving charging efficiency.

[0133] In some possible implementations, in step S112, the target charging voltage of the accessed battery pack is determined according to the tolerance information, the battery information of the accessed battery pack, and the battery information of the target battery pack, including:

[0134] According to the tolerance information, the battery information of the accessed battery pack, and the battery information of the target battery pack, a matching voltage difference value is determined.

[0135] The matching voltage difference value is a voltage difference value calculated based on the tolerance information of the switch device, the battery information of the accessed battery pack, and the battery information of the target battery pack in the process of determining the target charging voltage. The difference value reflects the amplitude that the target battery pack and the accessed battery pack need to coordinate in the charging voltage while meeting the bearing capacity of the switch device and taking into account the charging demands of the two battery packs.

[0136] In the embodiments of the present disclosure, after obtaining the tolerance information (such as the maximum tolerance voltage) of the switch device, the battery information (such as the current power) of the accessed battery pack, and the battery information (such as the current power) of the target battery pack, the matching voltage difference value is calculated by comprehensively considering these factors.

[0137] For example, according to the current power of the accessed battery pack, the voltage variation trend of the accessed battery pack during the charging process is analyzed,

[0138] According to the matching voltage difference value and the terminal voltage in the battery information of the target battery pack, the target charging voltage of the accessed battery pack is determined.

[0139] In the embodiments of the present disclosure, after the matching voltage difference is determined, the target charging voltage of the accessed battery pack can be calculated in combination with the terminal voltage in the battery information of the target battery pack. The terminal voltage of the target battery pack reflects the current potential state thereof.

[0140] For example, according to the matching voltage difference and the terminal voltage of the target battery pack, the target charging voltage of the accessed battery pack can be obtained through certain calculation methods. For example, if the matching voltage difference is a value higher than the target charging voltage of the accessed battery pack, then the target charging voltage of the accessed battery pack is equal to the terminal voltage of the target battery pack minus the matching voltage difference.

[0141] It can be understood that the smaller the matching voltage difference is, the smaller the impact current is when the target battery pack is connected in parallel when the accessed battery pack is charged to the target charging voltage.

[0142] The technical solution described above determines the matching voltage difference through the tolerance information of the switching device, the battery information of the accessed battery pack and the target battery pack, and can accurately calculate the voltage difference threshold that the two battery packs should reach before being connected in parallel. This helps to avoid parallel connection impact caused by excessive voltage difference and ensures smooth charging process. Based on the matching voltage difference and the terminal voltage, the target charging voltage of the accessed battery pack is determined. This ensures that the setting of the target charging voltage takes into account both the voltage matching between battery packs and the current charging state of the target battery pack, thereby achieving a more scientific and reasonable charging voltage setting.

[0143] In some possible implementation manners, the battery information includes resistance information, and the determining the matching voltage difference according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack includes:

[0144] The parallel resistance information is determined according to the resistance information of the accessed battery pack and the resistance information of the target battery pack.

[0145] In the embodiments of the present disclosure, the resistance information is the internal resistance value of the battery pack, and therefore the parallel resistance information is the sum of the resistance value represented by the resistance information of the accessed battery pack and the resistance value represented by the resistance information of the target battery pack.

[0146] The parallel resistance information is determined in the following manner: to achieve the aforementioned target charging voltage, the smaller the target charging voltage is, the smaller the impact current is when the target battery pack is connected, and therefore the terminal voltage of the battery pack Bank1 is equal to the terminal voltage of the battery pack Bank2, i.e. At the same time, , , Solving the equation set can obtain: , Among the branch currents, I2 is the impact current when the relay k2 corresponding to the closed Bank2 is in parallel.

[0147] Further, , we get: It can be seen that the matching voltage difference is the product of the tolerance current and the sum of the resistance value represented by the resistance information of the accessed battery pack and the resistance value represented by the resistance information of the target battery pack. Therefore, in the reverse derivation process, to determine the matching voltage difference, it is necessary to first determine the sum of the resistance value represented by the resistance information of the accessed battery pack and the resistance value represented by the resistance information of the target battery pack.

[0148] According to the parallel resistance information and the tolerance information, the matching voltage difference is determined.

[0149] In the embodiments of the present disclosure, since the internal resistance of the accessed battery pack and the internal resistance of the target battery pack are almost unchanged, the size of the impact current at the parallel moment depends on the difference between the terminal voltage of the battery pack bank 1 and the electromotive force of the battery pack bank 2. Therefore, the product of the resistance value represented by the parallel resistance information and the tolerance value represented by the tolerance information can be determined as the matching voltage difference. For example, the upper limit of the current that the relay can tolerate is 50A, and R1+R2=0.1Ω, then the matching voltage difference δU=5V here.

[0150] The above technical solution can more accurately understand the electrical characteristics of the battery pack in the parallel state by obtaining the resistance information of the accessed battery pack and the target battery pack, and calculating the parallel resistance information accordingly. After obtaining the parallel resistance information, the matching voltage difference is further determined in combination with the tolerance information of the switching device. The bearing capacity of the switching device in the parallel access process is fully considered, and it is ensured that the setting of the matching voltage difference will neither be too large to cause damage to the switching device, nor be too small to affect the charging efficiency.

[0151] In some possible implementation manners, the tolerance information includes an upper limit value of the tolerance current.

[0152] In the embodiments of the present disclosure, in order to ensure that the switching device will not be damaged due to excessive current at the parallel access moment, a suitable matching voltage difference can be calculated according to the parallel resistance value and the upper limit value of the tolerance current of the switching device.

[0153] Compared with directly calibrating the matching voltage difference, the disclosure can flexibly and accurately determine the matching voltage difference under different battery pack states (terminal voltage and electromotive force of the battery pack), so as to accurately determine the target charging voltage and reduce the current impact in the integration moment. For example, taking the upper limit value 30A of the tolerance current of the relay as an example, if R1+R2 is greater than or equal to 0.1Ω, then the terminal voltage difference ΔU during parallel connection can be set to less than or equal to 3V as the condition for starting parallel connection, so as to determine the impact current when k2 is closed and avoid causing k2 to stick, resulting in failure of the relay.

[0154] The above technical solution determines the matching voltage difference by the upper limit value of the tolerance current, which can help to reduce current fluctuations and abnormal phenomena during charging, thereby enhancing stability. The stable charging process not only improves the charging efficiency, but also reduces the device failure rate caused by abnormal current.

[0155] In some possible implementations, referring to FIG. 8, Figure 4 The method further includes:

[0156] In step S21, the target charging information is determined according to the target charging voltage and the terminal voltage in the battery information of the accessed battery pack.

[0157] The target charging information is a series of parameter sets for guiding the charging process, which is determined based on the target charging voltage and the battery information (such as the terminal voltage) of the accessed battery pack. These parameters usually include charging current, charging time, charging stage division, etc.

[0158] In the embodiment of the disclosure, after the target charging voltage and the terminal voltage of the accessed battery pack are obtained, the target charging information is determined in combination with the charging characteristic curve of the battery, the capacity of the battery, and the current power and other information. The difference between the target charging voltage and the terminal voltage of the accessed battery pack is calculated, which reflects the voltage amplitude that the battery pack needs to improve. According to the voltage difference and the internal resistance of the battery, the initial charging current can be estimated. Generally, the greater the voltage difference, the greater the initial charging current under the condition of a certain battery internal resistance. However, in order to protect the battery, the initial charging current is usually limited to a small value to avoid excessive impact on the battery.

[0159] Then, according to the charging characteristic curve of the battery, the charging parameters of different stages are determined. The battery package that has been accessed can be charged through the constant current mode, or when the battery power is low, the trickle charging mode is used to pre-charge the battery with a small current to activate the chemical reaction inside the battery; as the battery power increases, enter the constant current charging stage, at this time the charging current remains relatively stable, so that the battery can be quickly charged; when the battery voltage approaches the target charging voltage, switch to the constant voltage charging stage, at this time the charging voltage is kept at the target charging voltage, and the charging current gradually decreases until the target charging voltage is reached. At the same time, according to the capacity and current power of the battery, the time required for each charging stage is estimated, so as to determine the time planning of the entire charging process. Thus, the battery package that has been accessed can be quickly charged before being connected in parallel to the target battery package.

[0160] In step S22, the battery package that has been accessed is charged according to the target charging information.

[0161] In the embodiments of the present disclosure, the current and voltage output to the battery package can be adjusted in real time according to the charging current, charging voltage and other parameters in the target charging information, so as to make the voltage of the battery package that has been accessed reach the target charging voltage as soon as possible, thereby enabling the parallel connection of the target battery package, and thus shortening the charging waiting time.

[0162] The above technical solution determines the target charging information by combining the target charging voltage and the terminal voltage information of the battery package that has been accessed, and can perform individualized charging control according to the specific state of each battery package. This helps to ensure that the battery package is always in the best state during the charging process, improves the charging efficiency, shortens the charging time, and can avoid overcharging or undercharging.

[0163] In some possible implementations, the target charging information is determined according to the target charging voltage and the terminal voltage in the battery information of the battery package that has been accessed, and includes:

[0164] The target charging information includes a charging period and a target charging terminal voltage corresponding to each charging period.

[0165] The charging period can be a time interval divided according to a specific charging strategy in the charging process of the battery package that has been accessed. In a charging period, the battery package can be charged with relatively stable charging parameters (such as charging terminal voltage, charging current, etc.). The target charging terminal voltage is the terminal voltage of the battery package that has been accessed after each charging period ends.

[0166] In the embodiments of the present disclosure, the target charging voltage and the current terminal voltage of the accessed battery pack are comprehensively considered, and the charging period and the charging terminal voltage corresponding to each charging period are determined in combination with the charging characteristic curve of the battery, the battery capacity, the current power and other factors.

[0167] For example, the difference between the target charging voltage and the current terminal voltage of the battery is calculated. If the difference is large, it means that the battery needs a large voltage boost amplitude, and at this time, multiple charging periods can be divided to gradually boost the battery voltage to the target value. In each charging period, the appropriate charging terminal voltage is determined according to the charging characteristics of the battery. For example, when the battery power is low, a lower charging terminal voltage is set for pre-charging to avoid excessive impact on the battery. As the battery power increases, the charging terminal voltage is gradually increased to speed up the charging speed. When the battery voltage approaches the target charging voltage, the charging terminal voltage is kept stable near the target value for constant voltage charging.

[0168] According to the charging period and the target charging terminal voltage corresponding to each charging period, the target charging information is determined.

[0169] In the embodiments of the present disclosure, the target charging terminal voltage of each charging period and the internal resistance and other information of the battery can be used to calculate the charging current corresponding to each charging period. At the same time, according to the capacity of the battery pack and the charging current of each charging period, the charging duration of each charging period is estimated, and then the target charging information including the charging period duration, the charging current and the target charging terminal voltage is obtained.

[0170] The above technical solution determines the charging period and the charging terminal voltage corresponding to each charging period according to the target charging voltage and the terminal voltage of the accessed battery pack, and realizes the segmented control of the charging process. The segmented control strategy can meet the needs of the battery pack at different power stages, can improve the accuracy of charging, and can ensure that the battery pack is always in the best state during the charging process. This helps to optimize the charging efficiency.

[0171] In some possible implementations, the charging of the accessed battery pack according to the target charging information includes:

[0172] The terminal voltage error between the actual charging terminal voltage of the accessed battery pack after the completion of each charging period and the corresponding target charging terminal voltage is determined.

[0173] The actual charging terminal voltage is the voltage value actually measured between the terminals of the accessed battery pack after the completion of each charging period, which is the real voltage state reached by the battery pack during the charging process and reflects the actual response of the battery pack under the current charging condition.

[0174] Wherein, the terminal voltage error is the difference between the actual charging terminal voltage and the corresponding target charging terminal voltage. The terminal voltage error reflects the deviation between the actual voltage and the expected voltage during the charging process, and excessive terminal voltage error may mean that the charging process is abnormal and needs to be adjusted.

[0175] In the embodiments of the present disclosure, at the end of each charging period, the voltage across the accessed battery pack is measured in real time by the voltage sensor to obtain the actual charging terminal voltage. At the same time, the target charging terminal voltage corresponding to the charging period is obtained from the previously determined target charging information.

[0176] Then, the difference between the actual charging terminal voltage and the target charging terminal voltage, i.e. the terminal voltage error, is calculated. The formula for calculating the terminal voltage error is: Terminal voltage error = Actual charging terminal voltage - Target charging terminal voltage. The positive and negative of the terminal voltage error indicates whether the actual voltage is higher or lower than the target voltage.

[0177] Determine the cumulative current error of the accessed battery pack after each charging period is completed.

[0178] Wherein, the cumulative current error is an error value obtained by integrating the deviation between the actual charging current and the target charging current within the charging period after the completion of each charging period. It takes into account the fluctuation of the current in the entire charging period and reflects the difference between the current control and the expectation during the charging process.

[0179] In the embodiments of the present disclosure, the charging current is monitored in real time within each charging period and compared with the target charging current set in the target charging information. At the same time, the current deviation (actual charging current - target charging current) at each time is integrated and calculated. The process of integral calculation is to multiply the current deviation at each time point in the charging period by the corresponding time interval, and then add all the results. The cumulative current error reflects the overall deviation between the actual charging current and the target charging current in the entire charging period.

[0180] According to the terminal voltage difference and the cumulative current error, determine the target charging current of the next charging period.

[0181] Wherein, the target charging current is the expected charging current value set for the next charging period. It is calculated according to the terminal voltage error and the cumulative current error and other information through a certain algorithm, and is used to adjust the charging parameters of the next charging period to ensure that the charging process is more in line with the charging characteristics of the battery.

[0182] In the embodiments of the present disclosure, the target charging current of the next charging period is adjusted according to the terminal voltage error and the cumulative current error. For example, the adjustment is made through a proportional integral control algorithm.

[0183] For example, in the proportional-integral control algorithm, the proportional term directly adjusts the target charging current according to the size of the terminal voltage error, the larger the error, the greater the adjustment range; the integral term eliminates the steady-state error of the system according to the cumulative current error, and ensures the accuracy of the current in the long-term charging process. Then, according to the preset PI parameters, the terminal voltage error and the cumulative current error are calculated to obtain the target charging current adjustment amount of the next charging period, which is then added to the current target charging current to obtain a new target charging current.

[0184] According to the target charging current of the next charging period, the battery pack is charged.

[0185] In the embodiments of the present disclosure, according to the target charging current, the output current is adjusted by the internal charging control circuit to reach the target value. During the charging process, the charging state of the battery pack is continuously monitored, including the terminal voltage, current, temperature and other parameters, to ensure that the charging process is safe and stable.

[0186] The above technical solution realizes real-time monitoring of the charging process by calculating the terminal voltage error between the actual charging terminal voltage and the target charging terminal voltage, and the cumulative current error after each charging period is completed. It can timely find the deviation in the charging process, improve the charging accuracy and charging efficiency, determine the target charging current of the next charging period based on the terminal voltage error and the cumulative current error, so that the charging process is more accurate. The size of the charging current can be dynamically adjusted to compensate for the previous error, improve the charging efficiency, and ensure that the battery pack can complete the charging according to the predetermined target charging information, thereby improving the charging accuracy and reliability.

[0187] In some possible implementations, the determining of the target charging current of the next charging period according to the terminal voltage difference and the cumulative current error includes:

[0188] Determining a proportional response current according to the terminal voltage difference and a proportional coefficient.

[0189] In the embodiments of the present disclosure, the product of the terminal voltage difference and the proportional coefficient is determined as the proportional response current.

[0190] Determining an integral response current according to the cumulative current error and an integral coefficient.

[0191] In the embodiments of the present disclosure, the product of the cumulative current error and the integral coefficient is determined as the integral response current.

[0192] Determining the target charging current of the next charging period according to the proportional response current and the integral response current.

[0193] In the embodiments of the present disclosure, the sum of the proportional response current and the integral response current is determined as the target charging current of the next charging period.

[0194] The technical solution can convert the terminal voltage difference into a proportional response current through a proportional coefficient, can instantly perceive the deviation of the actual voltage of the current charging period from the target voltage, and quickly adjust the charging current. The fast response mechanism effectively shortens the adjustment time of the charging process, avoids the reduction of charging efficiency or damage to the battery caused by voltage deviation, and the introduction of the integral response current can compensate for the accumulated current error. The integral coefficient quantifies the cumulative effect of historical errors, which can gradually correct the deviation caused by parameter drift or external interference in the long-term charging process, and ensure that the charging current is always close to the target value. The dynamic response and steady-state accuracy are optimized.

[0195] In some possible implementations, in step S12, after the target battery pack is connected in parallel, the target battery pack and the connected battery pack are charged according to the target charging voltage, including:

[0196] In the case where the connected battery pack is charged to the target charging voltage, the switch device corresponding to the target battery pack is controlled to be closed, and in the closed state, the charging loop of the target battery pack is connected in parallel to the charging device.

[0197] In the embodiments of the present disclosure, the charging state of the connected battery pack can be monitored in real time, including the terminal voltage thereof. When it is detected that the terminal voltage of the connected battery pack reaches the target charging voltage set in advance, it is determined that the connected battery pack has completed charging or reaches the voltage requirement of the current charging stage.

[0198] At this time, in order to connect the target battery pack to the charging device for charging, a closing instruction can be sent to the switch device corresponding to the target battery pack. After receiving the instruction, the contacts in the switch device will be closed, so that the charging loop of the target battery pack is in communication with the charging device. Since the charging loop of the target battery pack is in parallel with the charging loop of the connected battery pack, the target battery pack is connected in parallel to the charging device.

[0199] After the target battery pack is connected in parallel, the target battery pack and the connected battery pack are charged.

[0200] In the embodiments of the present disclosure, after the target battery pack is connected in parallel to the charging device, the charging device provides electric energy to the connected battery pack and the target battery pack at the same time. Since the two battery packs are in parallel, the voltages across the two battery packs are equal, and both equal the voltage output by the charging device.

[0201] For example, if the matching voltage difference between the accessed battery pack and the target battery pack is 4V, the corresponding battery state of charge difference is 4%, and if a current of 0.1C is used to charge the battery pack Bank1, the parallel connection is started only when the electromotive force is less than or equal to 3V, then the time required is 24 minutes, which is a long time. Using the PI control method proposed in the present disclosure, the charging time of the battery pack Bank1 can be ignored, that is, the charging time is saved for 24 minutes.

[0202] The above technical solution quickly connects the charging circuits of multiple battery packs in parallel to the charging device by controlling the closing of the switch device corresponding to the target battery pack. The parallel connection mechanism can match the charging capacity of the charging device, and can be connected in parallel to allow the charging device to provide current to multiple battery packs at the same time, avoiding the decline of the overall charging efficiency caused by the limitation of a single battery pack in series charging.

[0203] In some possible implementations, in step S11, the target charging voltage of the accessed battery pack is determined in response to establishing a connection with the charging device, including:

[0204] In response to establishing a connection with the charging device, the output charging information of the charging device is obtained.

[0205] The output charging information is the electrical parameter information possessed by the charging device when transmitting electric energy to the vehicle battery pack, mainly including output voltage, output current, maximum output power, etc. These information reflect the charging capacity and current charging state of the charging device.

[0206] For example, when the vehicle establishes a physical connection (such as the charging gun being inserted into the charging interface of the vehicle) with the charging device and completes the electrical connection, the battery management system on the vehicle will communicate with the charging device through a specific communication protocol (such as CAN bus communication protocol).

[0207] The battery management system sends an instruction to the charging device to request the output charging information, and the charging device feeds back the current output voltage, output current, maximum output power, etc. to the battery management system after receiving the instruction. After receiving these information, the battery management system stores them in the internal memory for subsequent analysis and processing.

[0208] In another example, when the vehicle establishes a physical connection with the charging device (e.g., the charging gun is inserted into the charging interface of the vehicle) and completes the electrical connection, the battery management system on the vehicle communicates with the charging device through a specific communication protocol (e.g., CAN bus communication protocol). The battery management system sends the series charging condition to the charging device. After receiving the series charging condition, the charging device obtains its current output voltage, output current, maximum output power, and other output charging information.

[0209] If the output charging information does not meet the series charging condition, the target charging voltage of the accessed battery pack is determined.

[0210] The series charging condition is to connect multiple battery packs end to end in sequence to make them series to accept charging together. The series charging condition involves whether the output voltage range of the charging device can meet the total voltage demand of the series connected battery packs, whether the output current of the charging device matches the charging characteristics of the battery packs, and other factors. For example, if the total voltage of the series connected battery packs exceeds the maximum output voltage of the charging device, or the charging device cannot provide a stable current suitable for charging the series connected battery packs, the series charging condition is not met.

[0211] For example, after the battery management system obtains the output charging information of the charging device, it determines whether the output charging information of the charging device meets the series charging condition according to the number of accessed battery packs on the vehicle, the rated voltage of each battery pack, and the related requirements of series charging. If it is determined that the output charging information of the charging device does not meet the series charging condition (e.g., the maximum output voltage of the charging device is less than the total voltage of the series connected battery packs, or the charging device cannot provide a stable current suitable for charging the series connected battery packs), the battery management system can determine the target charging voltage of the accessed battery packs according to the battery type, capacity, current capacity of the accessed battery packs, and the use requirements of the vehicle.

[0212] In another example, the charging pile can determine whether the output charging information of the charging device meets the series charging condition according to the received series charging condition. If it is determined that the output charging information of the charging device does not meet the series charging condition (e.g., the maximum output voltage of the charging device is less than the total voltage of the series connected battery packs, or the charging device cannot provide a stable current suitable for charging the series connected battery packs), the charging pile can determine the target charging voltage of the accessed battery packs according to the battery type, capacity, current capacity of the accessed battery packs, and the use requirements of the vehicle.

[0213] The above technical solutions can automatically determine whether the current charging device meets the series charging condition by responding to the connection with the charging device and obtaining its output charging information. If the series charging condition is not met, parallel charging can be performed, which improves the charging flexibility.

[0214] In some possible implementations, the method further includes:

[0215] In a case where the output charging information meets the series charging condition, controlling the multiple battery packs to be connected in series to be charged.

[0216] In a case where the output charging information meets the series charging condition, controlling the multiple battery packs to be connected in series to be charged.

[0217] For example, after the vehicle establishes a connection with the charging device and obtains the output charging information, the battery management system on the vehicle analyzes and judges the output charging information of the charging device according to the number of battery packs, the rated voltage of each battery pack, and a preset series charging condition. If it is judged that the output charging information meets the series charging condition, a corresponding control instruction is generated, which is used to control the connection switches between the battery packs and the connection switches with the charging device, so as to realize the series connection of the multiple battery packs to be charged.

[0218] In the embodiments of the present disclosure, a special switch device is usually provided on the vehicle, which is used to control the connection between the battery packs and the connection between the battery packs and the charging device. These switch devices can be relays, contactors, or other electrical elements. The battery management system sends the generated control instruction to the control circuit of the switch device, and the control circuit controls the on-off state of the switch according to the instruction. When series connection to be charged is needed, the battery management system controls the corresponding switch to be closed, so that the multiple battery packs are connected in series in sequence, a series circuit is formed, and the series circuit is connected to the charging device.

[0219] In an implementation, the above embodiments are described by the following example. First, in response to the operation of the user inserting the charging gun into the charging interface of the vehicle, it is determined that the vehicle establishes a physical connection with the charging pile. In response to the electrical connection between the vehicle and the charging pile, that is, the completion of communication, it is identified that the charging pile outputs less than 1000V (for example, 500V) according to the insulation identification at the charging pile end (for example, parallel charging is needed in this case, and if series charging is needed, the charging pile can output 1000V), and the double-bank battery pack of the vehicle is an 800V battery pack.

[0220] Further, assuming that the electromotive force E2 of the battery pack Bank2 is greater than the electromotive force E1 of the battery pack Bank1, and E2-E1= DE (such as 7V), at this time, the relay k1 on the charging circuit of the battery pack Bank1 is closed first, so that the battery pack Bank1 is charged as an already connected battery pack. At the same time, the target charging voltage can be determined according to the preset tolerance information of the relay of the battery pack Bank2, for example, or the target charging voltage can be determined according to the preset tolerance information of the relay of the battery pack Bank2 and the preset matching voltage difference, for example, 3V.

[0221] In the case of charging the battery pack Bank1 as an already connected battery pack, in order to shorten the charging time of the battery pack Bank1 before parallel connection, a PI control charging circuit is used, so that the terminal voltage of the battery pack Bank1 reaches the terminal voltage U2 (=E2, before closing) of the battery pack Bank2 at the fastest speed. Of course, the limit of the charging current for charging the battery pack Bank1 is subject to the charging current limit of the battery pack Bank1.

[0222] Further, in the charging process of charging the battery pack Bank1 as an already connected battery pack, when the condition is met, for example, when the battery pack Bank1 reaches the target charging voltage, that is, the difference between the terminal voltage of the battery pack Bank1 and the terminal voltage of the battery pack Bank2 is equal to 3V, the relay k2 on the charging circuit of the battery pack Bank2 is closed. Further, after the relay k2 is closed, the double-Bank parallel charging is entered, at this time, the charging current can be increased to the sum of the charging current limits allowed by the battery pack Bank1 and the battery pack Bank2 for charging, until the user pulls out the charging gun, or the battery pack Bank1 and the battery pack Bank2 are fully charged, and the parallel charging process is ended.

[0223] The above technical solution realizes comprehensive improvement of charging efficiency, resource utilization rate and energy utilization rate by dynamically controlling the series connection of the battery pack when the series charging condition is met.

[0224] According to the embodiments of the present disclosure, a charging device is also provided, as shown in Figure 5 The charging device comprises:

[0225] The determining module 510 is configured to determine a target charging voltage of an already connected battery pack in response to establishing a connection with the charging device, wherein the target charging voltage is determined according to battery information of the already connected battery pack and battery information of a target battery pack, and the target battery pack is at least one of the battery packs that are not connected in parallel;

[0226] The charging module 520 is configured to charge the target battery pack and the already connected battery pack after connecting the target battery pack in parallel according to the target charging voltage.

[0227] In some possible implementation manners, the determining module 510 comprises:

[0228] The obtaining sub-module is configured to obtain tolerance information of a switching device corresponding to the target battery pack, the switching device being a device for opening or closing a charging loop of the target battery pack;

[0229] The voltage determining sub-module is configured to determine a target charging voltage of the accessed battery pack according to the tolerance information, battery information of the accessed battery pack and battery information of the target battery pack.

[0230] In some possible implementation manners, the voltage determining sub-module is configured to:

[0231] determine a matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack;

[0232] determine the target charging voltage of the accessed battery pack according to the matching voltage difference value and an end voltage in the battery information of the target battery pack.

[0233] In some possible implementation manners, the battery information comprises resistance information, and the voltage determining sub-module is configured to:

[0234] determine parallel resistance information according to resistance information of the accessed battery pack and resistance information of the target battery pack;

[0235] determine the matching voltage difference value according to the parallel resistance information and the tolerance information.

[0236] In some possible implementation manners, the charging module 520 comprises:

[0237] The determining sub-module is configured to determine target charging information according to the target charging voltage and an end voltage in the battery information of the accessed battery pack;

[0238] The charging sub-module is configured to charge the accessed battery pack according to the target charging information.

[0239] In some possible implementation manners, the determining sub-module is configured to:

[0240] determine a charging period and a target charging end voltage corresponding to each of the charging periods according to the target charging voltage and the end voltage in the battery information of the accessed battery pack;

[0241] determine the target charging information according to the charging period and the target charging end voltage corresponding to each of the charging periods.

[0242] In some possible implementation manners, the charging sub-module is configured to:

[0243] determine an end voltage error between the actual end voltage of the accessed battery pack and the corresponding target end voltage after each charging period;

[0244] determine a cumulative current error of the accessed battery pack after each charging period;

[0245] determine the target charging current of the next charging period according to the end voltage difference and the cumulative current error;

[0246] charge the accessed battery pack according to the target charging current of the next charging period.

[0247] In some possible implementation manners, the charging sub-module is configured to:

[0248] determine a proportional response current according to the end voltage difference and a proportional coefficient;

[0249] determine an integral response current according to the cumulative current error and an integral coefficient;

[0250] determine the target charging current of the next charging period according to the proportional response current and the integral response current.

[0251] In some possible implementation manners, the charging module 520 is configured to:

[0252] in a case where the charging of the accessed battery pack reaches the target charging voltage, control the switch device corresponding to the target battery pack to be closed, and in a closed state, the switch device connects the charging loop of the target battery pack in parallel with the charging device;

[0253] after the target battery pack is connected in parallel, charge the target battery pack and the accessed battery pack.

[0254] In some possible implementation manners, the determining module 510 is configured to:

[0255] in response to establishing a connection with the charging device, acquire output charging information of the charging device;

[0256] if the output charging information does not satisfy the series charging condition, determine the target charging voltage of the accessed battery pack.

[0257] In some possible implementation manners, the charging module 520 is further configured to:

[0258] In a case where the output charging information satisfies the series charging condition, the plurality of battery packs are controlled to be connected in series for charging.

[0259] The present disclosure also provides a vehicle, comprising:

[0260] a processor;

[0261] a memory for storing processor-executable instructions;

[0262] The processor is configured to execute the executable instructions stored in the memory to implement the method of any one of the preceding embodiments.

[0263] The present disclosure also provides a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the method of any one of the preceding embodiments.

[0264] According to the present disclosure, a computer program product is also provided, comprising a computer program which, when executed by a processor, implements the steps of the method of any one of the preceding embodiments.

[0265] Figure 6 is a block diagram of a vehicle 600 according to an exemplary embodiment. For example, the vehicle 600 can be a hybrid vehicle, or can be a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other type of vehicle. The vehicle 600 can be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0266] Referring to Figure 6 , the vehicle 600 can include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. The vehicle 600 can include more or fewer subsystems, and each subsystem can include multiple components. In addition, each subsystem of the vehicle 600 and each component can be interconnected by wired or wireless means.

[0267] In some embodiments, the infotainment system 610 can include a communication system, an entertainment system, a navigation system, and the like.

[0268] The perception system 620 can include a number of sensors for sensing information about the environment surrounding the vehicle 600. For example, the perception system 620 can include a global positioning system (which can be a GPS system, a Beidou system, or other positioning system), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0269] The decision control system 630 can include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0270] The drive system 640 can include components that provide motive power for the vehicle 600. In one embodiment, the drive system 640 can include an engine, an energy source, a transmission system, and wheels. The engine can be one or a combination of an internal combustion engine, an electric motor, an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0271] Some or all functions of the vehicle 600 are controlled by the computing platform 650. The computing platform 650 can include at least one processor 651 and a memory 652, the processor 651 can execute instructions 653 stored in the memory 652.

[0272] The processor 651 can be any conventional processor, such as commercially available CPUs. The processor can also include a graphics processing unit (GPU), a field programmable gate array (FPGA), a system on chip (SOC), an application specific integrated circuit (ASIC), or a combination thereof.

[0273] The memory 652 can be implemented by any type of volatile or nonvolatile memory or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0274] In addition to the instructions 653, the memory 652 can also store data, such as road maps, route information, the location, direction, speed of the vehicle, and the like. The data stored in the memory 652 can be used by the computing platform 650.

[0275] In the embodiments of the present disclosure, the processor 651 can execute the instructions 653 to complete all or part of the steps of the charging method described above.

[0276] Those skilled in the art can further appreciate that the various illustrative logical blocks and steps (steps) described in connection with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or combinations of both. Such functionality can be achieved with various methods, as would be known to those skilled in the art, with the choice of methods depending on the particular application and design constraints. Those skilled in the art can make these choices using their own knowledge and best judgment, and the embodiments disclosed herein are not limited to a particular implementation.

[0277] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, use of the word exemplary is intended to present concepts in a concrete manner. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. Thus, use of the articles in this application and the appended claims is not limiting.

[0278] Also, although the disclosure has been described with respect to one or more implementations, those skilled in the art will recognize the applicability of various modifications and alternatives in light of the foregoing description and accompanying drawings. The disclosure is not limited to the disclosed implementations, but rather, the scope of the disclosure is to be accorded the broadest interpretation of the appended claims to encompass all equivalent variations and alternatives. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise specified, terms are intended to correspond to any component which functions in a manner consistent with the particular function of the described component, even if the structure is not identical to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, such feature can be combined with one or more other features of the other implementations as can be desired and advantageous for any given or particular application. Furthermore, to the extent that "comprising", "including", "carrying", "having", "containing", or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0279] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

[0280] It should be understood that the present disclosure is not limited to the precise structures as herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A charging method characterized by, The method comprises: determining a target charging voltage of the accessed battery pack in response to establishing a connection with the charging device, the target charging voltage being determined according to battery information of the accessed battery pack and battery information of a target battery pack, the target battery pack being at least one of the battery packs not connected in parallel; charging the target battery pack and the accessed battery pack after connecting the target battery pack in parallel according to the target charging voltage; wherein the determination of the target charging voltage of the accessed battery pack comprises: obtaining tolerance information of a switch device corresponding to the target battery pack, the switch device being a device for opening or closing a charging loop of the target battery pack; determining the target charging voltage of the accessed battery pack according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack; wherein the determination of the target charging voltage of the accessed battery pack according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack comprises: determining a matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack; determining the target charging voltage of the accessed battery pack according to the matching voltage difference value and an end voltage in the battery information of the target battery pack.

2. The method of claim 1, wherein, The battery information comprises resistance information, and the determination of the matching voltage difference value according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack comprises: determining parallel resistance information according to resistance information of the accessed battery pack and resistance information of the target battery pack; determining the matching voltage difference value according to the parallel resistance information and the tolerance information.

3. The method of claim 2, wherein, The tolerance information comprises an upper limit value of a tolerance current.

4. The method of claim 1, wherein, The method further comprises: determining target charging information according to the target charging voltage and an end voltage in the battery information of the accessed battery pack; charging the accessed battery pack according to the target charging information.

5. The method of claim 4, wherein, The determination of the target charging information according to the target charging voltage and the end voltage in the battery information of the accessed battery pack comprises: determining a charging period and a target charging end voltage corresponding to each charging period according to the target charging voltage and the end voltage in the battery information of the accessed battery pack; determining the target charging information according to the charging period and the target charging end voltage corresponding to each charging period.

6. The method of claim 5, wherein, The charging of the accessed battery pack according to the target charging information comprises: determining an end voltage error between an actual charging end voltage of the accessed battery pack after completion of each charging period and a corresponding target charging end voltage; determining a cumulative current error of the accessed battery pack after completion of each charging period; determining a target charging current of a next charging period according to the end voltage error and the cumulative current error; charging the accessed battery pack according to the target charging current of the next charging period.

7. The method of claim 6, wherein, The determination of the target charging current of the next charging period according to the end voltage error and the cumulative current error comprises: determine a proportional response current according to the terminal voltage difference and a proportional coefficient; determine an integral response current according to the accumulated current error and an integral coefficient; determine a target charging current of a next charging period according to the proportional response current and the integral response current.

8. The method according to any one of claims 1-7, characterized in that, the charging of the target battery pack and the accessed battery pack after the target battery pack is connected in parallel according to the target charging voltage, comprises: in the case that the charging of the accessed battery pack reaches the target charging voltage, controlling the switch device corresponding to the target battery pack to be closed, the switch device connecting the charging loop of the target battery pack in parallel to the charging device in the closed state; the charging of the target battery pack and the accessed battery pack after the target battery pack is connected in parallel.

9. The method according to any one of claims 1-7, characterized in that, the target charging voltage of the accessed battery pack is determined in response to the connection with the charging device, comprising: in response to the connection with the charging device, obtaining output charging information of the charging device; if the output charging information does not meet the series charging condition, determining the target charging voltage of the accessed battery pack.

10. The method of claim 9, wherein, the method further comprises: in the case that the output charging information meets the series charging condition, controlling a plurality of battery packs to be connected in series for charging.

11. A charging device, characterized by comprises: a determination module configured to determine a target charging voltage of an accessed battery pack in response to the connection with the charging device, the target charging voltage being determined according to battery information of the accessed battery pack and battery information of a target battery pack, the target battery pack being at least one of the battery packs not connected in parallel; a charging module configured to charge the target battery pack and the accessed battery pack after the target battery pack is connected in parallel according to the target charging voltage; wherein the determination module comprises: an acquisition sub-module configured to acquire tolerance information of a switch device corresponding to the target battery pack, the switch device being a device for opening or closing a charging loop of the target battery pack; a voltage determination sub-module configured to determine a target charging voltage of an accessed battery pack according to the tolerance information, battery information of the accessed battery pack and battery information of the target battery pack; wherein the voltage determination sub-module is configured to: determine a matching voltage difference according to the tolerance information, the battery information of the accessed battery pack and the battery information of the target battery pack; determine the target charging voltage of the accessed battery pack according to the matching voltage difference and a terminal voltage in the battery information of the target battery pack.

12. The apparatus of claim 11, wherein, the battery information comprises resistance information, and the voltage determination sub-module is configured to: determine parallel resistance information according to resistance information of the accessed battery pack and resistance information of the target battery pack; determine the matching voltage difference according to the parallel resistance information and the tolerance information.

13. The apparatus of claim 11, wherein, the charging module comprises: a determination sub-module configured to determine target charging information according to the target charging voltage and a terminal voltage in the battery information of the accessed battery pack; a charging sub-module configured to charge the accessed battery pack according to the target charging information.

14. The apparatus of claim 13, wherein, The determining submodule is configured to: determine charging periods and target charging end voltages corresponding to each of the charging periods according to the target charging voltage and end voltages in the accessed battery pack information; determine the target charging information according to the charging periods and the target charging end voltages corresponding to each of the charging periods.

15. The apparatus of claim 14, wherein, The charging submodule is configured to: determine end voltage differences between actual charging end voltages of the accessed battery pack and corresponding target charging end voltages after each of the charging periods is completed; determine cumulative current errors of the accessed battery pack after each of the charging periods is completed; determine target charging currents of a next charging period according to the end voltage differences and the cumulative current errors; charge the accessed battery pack according to the target charging currents of the next charging period.

16. The apparatus of claim 15, wherein, The charging submodule is configured to: determine proportional response currents according to the end voltage differences and a proportional coefficient; determine integral response currents according to the cumulative current errors and an integral coefficient; determine target charging currents of a next charging period according to the proportional response currents and the integral response currents.

17. The apparatus of any one of claims 11-16, wherein, The charging module is configured to: in a case where charging of the accessed battery pack reaches the target charging voltage, control a switch device corresponding to the target battery pack to be closed, the switch device being in a closed state to connect a charging loop of the target battery pack in parallel to the charging device; after the target battery pack is connected in parallel, charge the target battery pack and the accessed battery pack.

18. The apparatus of any one of claims 11-16, wherein, The determining module is configured to: in response to establishing a connection with a charging device, acquire output charging information of the charging device; if the output charging information does not satisfy a series charging condition, determine the target charging voltage of the accessed battery pack.

19. The apparatus of claim 18, wherein, The charging module is further configured to: in a case where the output charging information satisfies the series charging condition, control a plurality of battery packs to be connected in series to the charging device.

20. A vehicle characterized by comprise: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the executable instructions stored in the memory to implement the method of any one of claims 1-10.

21. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1-10.

22. A computer program product, characterised in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1-10.

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