Vehicle charging method and device, vehicle, storage medium and product

Abstract

The invention relates to a vehicle charging method and device, a vehicle, a storage medium and a product, and the method comprises the steps: obtaining the maximum voltage of a charging pile in response to the connection operation of the vehicle and the charging pile; and determining a target charging strategy according to the obtained maximum voltage state of the charging pile, and charging a battery pack of the vehicle according to the target charging strategy. The corresponding charging strategy is determined by acquiring the maximum voltage state of the charging pile, and the charging strategies corresponding to different maximum voltage states of the charging pile are different, so that the charging performance of the vehicle can be improved.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, people's demand for new energy vehicles continues to increase. Among them, charging anxiety is the main consideration for consumers on electric vehicles, so the charging performance indicators of various vehicles have also been raised. In addition to increasing the charging current of high-voltage batteries, many models are increasing the battery voltage to achieve higher charging power. Therefore, the charging strategy of high-voltage platform vehicles on charging piles of various voltage platforms has become a top priority. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a charging method, a device, a vehicle, a storage medium and a product for a vehicle.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a vehicle charging method, comprising: In response to a connection operation between the vehicle and the charging pile, obtaining a maximum voltage of the charging pile; A target charging strategy is determined based on the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy.

[0005] Optionally, according to obtaining the maximum voltage state of the charging pile, determining a target charging strategy includes: When the maximum voltage of the charging pile is successfully obtained, a first voltage of the battery pack is obtained, where the first voltage is the voltage of the battery pack at the current moment; When it is determined that the first voltage is less than the second voltage of the charging pile, and the second voltage is less than the maximum voltage of the battery pack, the first charging strategy is used as the target charging strategy. The first charging strategy is used to instruct the battery pack to first perform a direct charging operation and then a boost charging operation. The second voltage is a fixed voltage value that is less than the maximum voltage of the charging pile.

[0006] Optionally, the first charging strategy includes: When detecting that the first voltage is less than the second voltage, instructing the charging pile to directly charge the battery pack; When it is detected that the first voltage is equal to the second voltage, a mode switch is performed, and the booster of the vehicle is used to boost and charge the battery pack.

[0007] Optionally, the step of boosting and charging the battery pack by using a booster of the vehicle includes: increasing the capacitor voltage of the booster to be equal to the second voltage; Reduce the requested current for battery charging needs; When the voltage at the charging seat end of the vehicle and the requested voltage of the battery charging requirement are equal to the maximum voltage of the charging pile, the booster is used to boost and charge the battery pack and restore the requested current of the battery charging requirement.

[0008] Optionally, the method further comprises: When it is determined that the maximum voltage of the battery pack is less than the maximum voltage of the charging pile, the battery pack is instructed to perform a direct charging operation.

[0009] Optionally, the method further comprises: When it is determined that the first voltage of the battery pack is greater than the maximum voltage of the charging pile, the battery pack is instructed to perform a boost charging operation.

[0010] Optionally, determining a target charging strategy according to obtaining a maximum voltage state of a charging pile includes: When the maximum voltage of the charging pile cannot be successfully obtained, obtaining the first voltage of the battery pack and estimating the maximum voltage of the charging pile to obtain a third voltage; The target charging strategy is determined according to a relationship between the first voltage and the third voltage.

[0011] Optionally, estimating the maximum voltage of the charging pile to obtain a third voltage includes: The booster is controlled to gradually increase the voltage. During the increasing process, if it is detected that the output current of the charging pile is interrupted, the requested voltage of the battery charging requirement when the current output is interrupted is obtained, and the requested voltage is used as the third voltage.

[0012] Optionally, determining the target charging strategy according to the relationship between the first voltage and the third voltage includes: When it is determined that the first voltage is less than the maximum voltage of the battery pack, and the maximum voltage of the battery pack is less than or equal to the third voltage, the second charging strategy is used as the target charging strategy, and the second charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after mode switching.

[0013] Optionally, the second charging strategy includes: When it is detected that the third voltage is greater than the first voltage, a mode switching is performed to switch the boost charging to the direct charging.

[0014] Optionally, the mode switching of the second charging strategy includes: When the capacitor voltage of the booster is equal to the first voltage, reducing the requested current for battery charging; When the voltage at the charging station terminal of the vehicle is equal to the requested voltage of the battery charging requirement and is greater than the first voltage by a fixed voltage value, the voltage at the charging station terminal is reduced to the first voltage and the maximum allowable charging current of the battery charging requirement is restored.

[0015] Optionally, determining the target charging strategy according to the relationship between the first voltage and the third voltage includes: Determine that the first voltage is less than the third voltage, and the third voltage is less than the maximum voltage of the battery pack, and use the third charging strategy as the target charging strategy. The third charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after a mode switch, and then perform a boost charging after a second mode switch.

[0016] Optionally, the third charging strategy includes: It is determined that when the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, a current interruption occurs in the charging pile, and the second mode switching is performed to switch the DC charging to the boost charging.

[0017] Optionally, the method further comprises: When it is determined that the first voltage is greater than or equal to the third voltage of the charging pile, it is used to instruct the battery pack to perform a boost charging operation.

[0018] According to a second aspect of an embodiment of the present disclosure, there is provided a charging device for a vehicle, comprising: an acquisition module, configured to acquire a maximum voltage of the charging pile in response to a connection operation between the vehicle and the charging pile; The charging module is configured to determine a target charging strategy based on the maximum voltage state of the charging pile, and charge the battery pack of the vehicle according to the target charging strategy.

[0019] According to a third aspect of an embodiment of the present disclosure, a charging circuit is provided, the charging circuit comprising: Battery pack; A booster, wherein a first end of the booster is connected to the positive electrode of the battery pack, and a second end of the booster is connected to the negative electrode of the battery pack; A first switch S5, wherein a first end of the first switch S5 is connected to the third end of the booster, and a second end of the first switch S5 is connected to the positive electrode of the charging seat end of the charging pile; a second switch S6, wherein a first end of the second switch S6 is connected to the fourth end of the booster, and a second end of the second switch S6 is connected to the negative electrode of the charging base; A third switch K5, wherein a first end of the third switch K5 is connected to the positive electrode of the battery pack, and a second end of the third switch K5 is connected to the negative electrode of the charging station; A fourth switch K6, wherein a first end of the fourth switch K6 is connected to the positive electrode of the battery pack, and a second end of the fourth switch K6 is connected to the negative electrode of the charging base.

[0020] Optionally, the charging circuit is configured as: When the maximum voltage of the charging pile is successfully obtained and it is detected that the first voltage of the battery pack is less than the second voltage of the charging pile, the third switch K5 and the fourth switch K6 are controlled to be closed, and the first switch S5 and the second switch S6 are controlled to be opened; When it is determined that the first voltage is equal to the second voltage, mode switching is performed, the third switch K5 and the fourth switch K6 are controlled to be opened, and the first switch S5 and the second switch S6 are controlled to be closed.

[0021] Optionally, the charging circuit is further configured as: When the maximum voltage of the charging pile cannot be successfully obtained, and it is detected that the estimated third voltage is less than or equal to the first voltage of the battery pack, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened, and the third voltage is a voltage estimated and obtained for the maximum voltage of the charging pile; When it is detected that the third voltage is greater than the first voltage, mode switching is performed, the first switch S5 and the second switch S6 are controlled to be opened, and the third switch K5 and the fourth switch K6 are controlled to be closed.

[0022] Optionally, the charging circuit is further configured as: When the maximum voltage of the charging pile cannot be successfully obtained, and it is determined that the estimated third voltage is less than or equal to the first voltage of the battery pack, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened, and the third voltage is a voltage estimated and obtained for the maximum voltage of the charging pile; When it is detected that the third voltage is greater than the first voltage, a mode switch is performed, the first switch S5 and the second switch S6 are controlled to be disconnected, and the third switch K5 and the fourth switch K6 are controlled to be closed; When it is determined that the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, a current interruption occurs in the charging pile, and the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened.

[0023] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the charging circuit described in the third aspect.

[0024] The present disclosure can adopt different charging strategies for different maximum voltage states of the charging pile, which can improve the performance of vehicle charging. Specifically, in response to the connection operation between the vehicle and the charging pile, the maximum voltage state of the charging pile is obtained. On this basis, the corresponding target charging strategy is determined according to the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy. That is, different charging strategies are adopted corresponding to different maximum voltage states of the charging pile. This can not only improve the flexibility of vehicle charging, but also improve the charging efficiency.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0027] Figure 1 These are charging example diagrams for two different charging modes.

[0028] Figure 2 This is an example diagram of the relationship between the battery pack charging capacity and SOC.

[0029] Figure 3 This is an example diagram of boost charging using a booster.

[0030] Figure 4 This is an example diagram of direct charging using a booster.

[0031] Figure 5 The present invention is a flow chart showing a method for charging a vehicle according to an exemplary embodiment.

[0032] Figure 6 The present invention is an exemplary diagram showing information interaction between a vehicle and a charging pile in a vehicle charging method according to an exemplary embodiment.

[0033] Figure 7 The invention is a block diagram of a charging circuit in a method for charging a vehicle according to an exemplary embodiment.

[0034] Figure 8 The figure is a flow chart showing another method for charging a vehicle according to an exemplary embodiment.

[0035] Fig. 9 is an example diagram of charging a battery pack based on a first charging strategy in another vehicle charging method according to an exemplary embodiment.

[0036] Fig.10 is an example diagram showing charging a battery pack based on a second charging strategy in another vehicle charging method according to an exemplary embodiment.

[0037] Fig.11 is an exemplary diagram showing charging a battery pack based on a third charging strategy in another vehicle charging method according to an exemplary embodiment.

[0038] Fig.12 is an exemplary diagram showing charging a battery pack based on a third charging strategy in another vehicle charging method according to an exemplary embodiment.

[0039] Fig.13 It is a block diagram of a charging device for a vehicle according to an exemplary embodiment.

[0040] Fig.14 is a block diagram of a vehicle according to an exemplary embodiment.

[0041] Fig.15 is a block diagram of a chip system according to an exemplary embodiment. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0043] In the description of the present disclosure, the terms used, such as "first", "second", etc., are used to distinguish similar objects and do not have to be understood as a specific order or sequence. In addition, in the description with reference to the accompanying drawings, the same symbols in different drawings represent the same elements unless otherwise stated.

[0044] Although operations or steps are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or to perform all the operations or steps shown to obtain the desired results. In the embodiments of the present disclosure, these operations or steps can be performed in series; these operations or steps can also be performed in parallel; or some of these operations or steps can be performed.

[0045] There are three main types of charging piles on the market. The maximum charging voltages of these three types of charging piles are 500V, 750V and 1000V respectively. However, the voltage range of known high-voltage platform vehicles mainly ranges from 500V to 900V.

[0046] In order to better realize charging, two charging modes are introduced. The first charging mode is direct charging. When the maximum voltage of the vehicle battery pack is ≤ the maximum voltage of the charging pile (upper limit voltage), the charging pile can directly charge the vehicle. The second charging mode is boost charging. When the maximum voltage of the vehicle battery pack is > the maximum voltage of the charging pile, the vehicle can achieve compatibility by adding a booster. For details, see Figure 1 Based on Figure 1 It is known that when the battery is charged directly through the charging pile, the switch K5 and the switch K6 of the vehicle are in a closed state, while the switch S5 and the switch S6 are in an open state. Conversely, when the battery is charged through the booster, the switch K5 and the switch K6 of the vehicle are in an open state, while the switch S5 and the switch S6 are in a closed state.

[0047] In boost charging mode, the power of the booster will largely affect the charging power of the vehicle on the low-voltage platform charging pile, that is, the greater the power of the booster, the better. However, blindly increasing the power of the booster will bring greater cost and space occupation to the vehicle. Therefore, the power of the booster on the vehicle is not very large, that is, the power of the booster is usually much smaller than the maximum chargeable power of the vehicle battery pack, and the hardware capacity of the booster is also much smaller than the capacity of the direct charging circuit. The greater the charging power, the better the charging performance of the battery pack.

[0048] It can be seen that for charging piles on low-voltage platforms, the charging performance of the vehicle will be largely limited by the booster. In addition, if the charging pile is not properly handled during the upgrade or maintenance process, it will lead to mismatch between the hardware and software of the charging pile. This problem will cause the voltage information in the message to be inconsistent with the actual capacity of the charging pile, which will affect the charging performance of the battery pack.

[0049] In the related art, there are two ways to charge vehicle batteries. The first way is to enter the direct charging mode when it is determined that the voltage of the battery pack is less than or equal to the maximum voltage of the charging pile; when it is determined that the maximum voltage of the battery pack is greater than the maximum voltage of the charging pile, it enters the boost charging mode and maintains the boost charging throughout the process. In this process, even if it is detected that the minimum voltage of the battery pack is less than the current voltage, and the current voltage is less than the maximum voltage of the charging pile, it is still in the boost charging mode, as shown in Table 1.

[0050] Table 1

[0051] Among them, Umax is the maximum voltage of the vehicle battery pack, Umin is the minimum voltage of the battery pack, Ucur is the current voltage of the battery pack, and Uchr is the maximum voltage of the charging pile. In related technologies, due to the mismatch between software and hardware, the vehicle cannot accurately judge the voltage platform of the charging pile. Some car companies directly classify this type of charging pile as a low-voltage platform charging pile and directly enter boost charging, that is, regardless of whether the maximum voltage of the charging pile is greater or less than the maximum voltage of the battery pack, the boost charging mode is adopted; some car companies have also adopted other solutions.

[0052] However, in the process of charging the battery pack based on the first method, when it is determined that the minimum voltage of the battery pack is less than the current voltage, and the current voltage is less than the maximum voltage of the charging pile, charging is mainly carried out through the boost charging mode. Due to the power limit of the booster, and when the voltage is in this range, the SOC (State of Charge) is low. At this time, the rechargeable power of the battery pack is in the optimal range, such as Figure 2 As shown, this will greatly sacrifice the charging performance of the battery pack.

[0053] The second method is for charging piles with mismatched hardware and software. When the battery is detected to enter the boost charging mode, it can first enter the boost charging mode and adjust the proportion of energy storage and charging according to the required output voltage. Figure 3 The switch U1 shown in the figure is opened, and the switch U2 is closed. At this time, the inductor L can store the energy of the charging pile. During the charging process, the switch U1 can be closed and the switch U2 can be opened. At this time, the inductor L and the energy of the charging pile can increase the voltage to the battery voltage and charge the battery at the same time. The specific process is as follows Figure 3 .

[0054] During the process of boost charging, the charging voltage can be gradually increased to explore the maximum voltage Uchr of the charging pile. When the maximum voltage Uchr of the charging pile is ≥ Umax, the booster can enter the pass-through mode and charge directly through the booster of the vehicle. During the charging process, the switch U1 can be closed and the switch U2 can be opened. At this time, the charging pile can directly charge the battery without storing energy, that is, there is no boost effect. For details, see Figure 4 shown.

[0055] However, when the maximum voltage of the charging pile is unknown, the second method uses a booster to achieve direct charging. Since the current carrying capacity of the booster is far less than that of the vehicle's direct charging circuit, it is limited by the current carrying capacity of the booster hardware, which will greatly affect the charging performance of the battery pack.

[0056] In order to solve the above problems, the present disclosure proposes a vehicle charging method, which can adopt different charging strategies according to the different maximum voltage states of the charging pile, that is, the measures taken for successfully obtaining the maximum voltage of the charging pile and failing to successfully obtain the maximum voltage of the charging pile are different, so that not only can charging be flexibly realized, but also the charging performance of the battery pack can be improved. The embodiments of the present disclosure can be applied to the charging control of high-voltage platform electric vehicles at charging piles of different voltage platforms to improve the charging performance of the vehicle.

[0057] Figure 5 is a flow chart of a vehicle charging method according to an exemplary embodiment. Figure 5 As shown, the method may include the following steps.

[0058] In step S110 , in response to the connection operation between the vehicle and the charging pile, the maximum voltage of the charging pile is acquired.

[0059] In the embodiment of the present disclosure, the connection operation between the vehicle and the charging pile can be the connection between the charging port of the vehicle and the charging pile, wherein the charging port can be a charging seat, that is, when it is detected that the charging gun of the charging pile is inserted into the charging port of the vehicle, the embodiment of the present disclosure can obtain the maximum voltage of the charging pile.

[0060] In some embodiments, when a battery charging operation is triggered, the vehicle may send a BHM (Battery Handshake Message) message to the charging pile, and the BHM message may include the maximum allowable total charging voltage and the communication protocol version number, etc. The maximum allowable total charging voltage may be the maximum allowable total charging voltage of the BMS (Battery Management System), which is used to ensure that the charging process is carried out within a safe voltage range, and may be the maximum voltage of the battery pack.

[0061] On this basis, the vehicle can receive the insulation detection voltage sent by the charging pile, which can be the smaller voltage obtained by the charging pile comparing the battery pack with its actual output voltage. For example, if the maximum output voltage of the battery pack is 500V and the actual maximum output voltage of the charging pile is 800V, then the insulation detection voltage at this time is 500V. For another example, if the maximum output voltage of the battery pack is 1000V and the actual maximum output voltage of the charging pile is 800V, then the insulation detection voltage at this time is 800V.

[0062] In the disclosed embodiment, the rule for the charging pile output current may be to compare the maximum output capacity of the charging pile itself with the vehicle BCL request voltage, and output the smaller one. That is, the maximum output voltage of the battery pack may be the BCL request voltage.

[0063] After obtaining the insulation detection voltage, the embodiment of the present disclosure can determine whether the insulation detection voltage is the same as the maximum voltage of the battery pack. If the two are the same, it means that the maximum voltage of the charging pile is greater than or equal to the maximum voltage of the battery pack. At this time, the charging pile can be used to directly charge the battery pack, that is, there is no need for boost charging.

[0064] Optionally, the vehicle may receive a CML (Charger Maximum Output Capability Message) message sent by the charging pile, which may include the maximum output capability of the charging pile, which may be used to convey the maximum output capability of the charging pile to the vehicle so that the vehicle can estimate the remaining charging time.

[0065] In the case where it is determined that the insulation detection voltage is different from the maximum voltage of the battery pack, the embodiment of the present disclosure can compare the insulation detection voltage with the maximum voltage of the charging pile carried in the CML message to determine whether the two are the same. If it is determined that the maximum voltage of the charging pile carried in the CML message is the same as the insulation detection voltage, it means that the software and hardware of the charging pile match, that is, the maximum voltage of the charging pile is successfully obtained, and the voltage information of the charging pile is clear at this time.

[0066] On the contrary, if it is determined that the maximum voltage of the charging pile carried in the CML message is different from the insulation detection voltage, it means that the maximum voltage acquisition of the charging pile fails. At this time, the voltage information of the charging pile is unclear, that is, the actual maximum voltage of the charging pile does not match the voltage information in the CML message.

[0067] In some embodiments, after receiving the CML message, the vehicle may send a BRO (Battery Ready OK) message to the charging pile, and after receiving the CRO (ChargerReady OK) message returned by the charging pile, send a BCL (Battery Charge Lead) message to the charging pile. In order to better understand the process of information interaction between the vehicle and the charging pile, the embodiment of the present disclosure provides the following example: Figure 6 The example diagram shown.

[0068] Figure 6 The BRO message shown is sent by the vehicle to the charging pile, which is used to indicate that the vehicle's battery management system is ready for charging and the charging process can be started; the CRO message is sent by the charging pile to the vehicle, which is used to indicate that the charging pile is ready to supply power to the vehicle and the charging process can be started; the BCL message can be sent by the vehicle to the charging pile, which may include the real-time charging requirements of the vehicle battery pack, such as the voltage and current required for charging.

[0069] In summary, the BCL message is a message sent by the vehicle to the charging pile, which may include the voltage requested by the vehicle to the charging pile, the current requested by the vehicle to the charging pile, and the charging mode (constant voltage / constant current).

[0070] In some embodiments, when the high-voltage battery of a vehicle is directly connected to a charging pile through components such as a wiring harness, a charging gun, a charging seat, a connector, and a relay (which only has the ability to conduct), the high-voltage battery has a large capacity, so the voltage output by the charging pile will be limited by the high-voltage battery. At this time, the output voltage of the charging pile is consistent with the voltage of the high-voltage battery pack. In other words, the output voltage of the charging pile cannot be output according to the voltage requested by the BCL. In addition, when the vehicle can also control the voltage at a set value by using power devices such as a booster and then connect it to the charging pile, the same effect can be achieved.

[0071] Optionally, when the charging pile is not directly connected to power devices such as a high-voltage battery and a booster, its output voltage will not be subject to voltage limitation. At this time, the charging voltage / output voltage of the charging pile can be output according to the BCL request voltage.

[0072] In step S120, a target charging strategy is determined based on the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy.

[0073] As an optional method, the embodiment of the present disclosure can determine the target charging strategy based on the maximum voltage state of the charging pile, that is, if the maximum voltage state of the charging pile is different, the corresponding charging strategy is different. On this basis, the embodiment of the present disclosure can charge the battery pack of the vehicle according to the target charging strategy.

[0074] In the embodiment of the present disclosure, the target charging strategy may be: first perform direct charging operation, then perform boost charging operation; perform boost charging operation; first perform boost charging operation, then perform direct charging operation; first perform boost charging operation, then perform direct charging operation, then perform boost charging operation. Which charging strategy to adopt may be determined by the embodiment of the present disclosure according to the maximum voltage state of the charging pile. When the maximum voltage of the charging pile is successfully obtained, the first charging strategy may be adopted. When the maximum voltage of the charging pile is not successfully obtained, the second charging strategy or the third charging strategy may be adopted.

[0075] In the embodiment of the present disclosure, the charging method of the vehicle can be Figure 7 The charging circuit shown in the figure is implemented. In the process of performing the direct charging operation, the embodiment of the present disclosure can close the Figure 7 The switches K5 and K6 are shown as being turned on, and the switches S5 and S6 are turned off. At this time, the charging pile can charge the high-voltage battery pack without going through a booster.

[0076] In the process of performing the boost charging operation, the embodiment of the present disclosure can close the Figure 7 The switches S5 and S6 are shown, and the switches K5 and K6 are disconnected. At this time, the charging pile needs to charge the high-voltage battery pack through a booster.

[0077] It should be noted that the embodiments of the present disclosure can be applied to charging stations of various voltage platforms (500V, 750V, 1000V) for charging electric vehicles of high voltage platforms (greater than 500V). In addition, the vehicles in the embodiments of the present disclosure can have the capabilities of direct charging and boost charging.

[0078] The disclosed embodiments can adopt different charging strategies for different maximum voltage states of the charging pile, which can improve the performance of vehicle charging. Specifically, in response to the connection operation between the vehicle and the charging pile, the maximum voltage state of the charging pile is obtained. On this basis, the corresponding target charging strategy is determined according to the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy. That is, different charging strategies are adopted corresponding to different maximum voltage states of the charging pile. This can not only improve the flexibility of vehicle charging, but also improve the charging efficiency.

[0079] Figure 8is a flow chart of a vehicle charging method according to an exemplary embodiment. Figure 8 As shown, the method may include the following steps.

[0080] In step S210 , in response to the connection operation between the vehicle and the charging pile, the maximum voltage of the charging pile is obtained.

[0081] The specific implementation of step S210 has been described in detail in the above embodiment and will not be repeated here.

[0082] In step S220, when the maximum voltage of the charging pile is successfully obtained, the first voltage of the battery pack is obtained.

[0083] As an optional method, when the maximum voltage of the charging pile is successfully obtained, the embodiment of the present disclosure can obtain the first voltage of the battery pack, that is, when the voltage information of the charging pile is detected to be clear, the embodiment of the present disclosure can obtain the first voltage of the battery pack. Among them, the first voltage can be the voltage of the battery pack at the current moment. At this time, the relationship between the maximum voltage Uchr of the charging pile, the minimum voltage Umin of the battery, the maximum voltage Umax of the battery, and the current voltage Ucur of the battery pack can be classified according to Table 2.

[0084] Table 2

[0085] Based on Table 2, when it is determined that the maximum voltage Umax of the battery pack is less than the maximum voltage Uchr of the charging pile, the embodiment of the present disclosure can directly charge the battery pack through the charging pile, that is, instruct the battery pack to perform a direct charging operation.

[0086] Optionally, when it is determined that the first voltage Ucur of the battery pack is greater than the maximum voltage Uchr of the charging pile, the embodiment of the present disclosure can charge the battery pack by boost charging, that is, instruct the battery pack to perform a boost charging operation.

[0087] In step S230, when it is determined that the first voltage is less than the second voltage of the charging pile, and the second voltage is less than the maximum voltage of the battery pack, the first charging strategy is used as the target charging strategy.

[0088] As an optional method, when the first voltage of the battery pack is obtained, the embodiment of the present disclosure can determine whether the first voltage is less than the second voltage of the charging pile. The second voltage can be a fixed voltage second only to the maximum voltage of the charging pile, that is, the second voltage can be a fixed voltage value less than the maximum voltage of the charging pile. For example, the second voltage can be the maximum voltage of the charging pile -20V.

[0089] It should be noted that when the output voltage of the charging pile is close to the upper limit voltage of the charging pile, the power that the charging pile can output will be limited. To avoid this problem, the embodiment of the present disclosure can keep the actual charging voltage and the upper limit voltage of the charging pile within a certain range. For example, the range (specified voltage) can be 20V.

[0090] Optionally, when it is determined that the first voltage is less than the second voltage of the charging pile, the embodiment of the present disclosure may continue to determine whether the second voltage is less than the maximum voltage of the battery pack. If it is determined that the first voltage is less than the second voltage of the charging pile, and the second voltage is less than the maximum voltage of the battery pack, the embodiment of the present disclosure may use the first charging strategy as the target charging strategy. The first charging strategy may be used to instruct the battery pack to perform a direct charging operation first, and then perform a boost charging operation.

[0091] That is, the embodiment of the present disclosure may adopt the first charging strategy to charge the battery pack. Specifically, when it is detected that the first voltage is less than the second voltage, the embodiment of the present disclosure may instruct the charging pile to directly charge the battery pack.

[0092] For example, when it is determined that the first voltage Ucur is less than the maximum voltage Uchr of the charging pile minus 20V (the second voltage), the vehicle can first enter the direct charging mode, at which time the Figure 7 The switch K5 and switch K6 are shown. On this basis, the charging pile can directly charge the battery pack, and the BCL request voltage can be the maximum voltage Uchr of the charging pile, wherein the BCL request current can be the maximum allowable charging current of the vehicle.

[0093] Optionally, when it is detected that the first voltage is greater than or equal to the second voltage, the embodiment of the present disclosure can perform mode switching, and use the booster of the vehicle to boost and charge the battery pack. That is, when it is detected that the current voltage (first voltage) of the battery pack is greater than or equal to the second voltage, the embodiment of the present disclosure can perform a charging mode switching operation, that is, switching the charging mode from the direct charging mode to the boost charging mode.

[0094] Specifically, when it is determined that the first voltage is greater than or equal to the second voltage, the embodiment of the present disclosure can increase the voltage of the booster to the second voltage, and at the same time can reduce the BCL request current. Afterwards, when it is determined that the voltage of the vehicle's charging port and the BCL request voltage are equal to the maximum voltage of the charging pile, the embodiment of the present disclosure can use the booster to boost and charge the battery pack.

[0095] As a specific implementation, see Fig. 9 When it is determined that the current battery voltage Ucur (first voltage) = the maximum charging pile voltage Uchr-20V (second voltage), the disclosed embodiment can perform mode switching. Figure 7The capacitor voltage of the booster Cin shown is increased to the maximum voltage Uchr-20V (second voltage) of the charging pile, so that Ucin=the maximum voltage Uchr-20V of the charging pile, that is, the capacitor voltage of the booster is increased to be equal to the second voltage. Here, the purpose of increasing the voltage of the booster to the second voltage is to reduce the time when the vehicle disconnects the switch K5 and the switch K6, and the switch S5 and the switch S6 are not closed, thereby shortening the time when the charging pile has no current output.

[0096] In addition, the embodiment of the present disclosure can reduce the request current of the battery charging demand, such as reducing the BCL request current to Fig. 9 The smaller value shown, the range of the reduced request current can be 1-5A. Here, the purpose of reducing the BCL request current is to reduce the charging current, so that when the switch K5 and the switch K6 are subsequently disconnected, the abnormal voltage generated by the charging pile dumping the load is as small as possible, to prevent the charging pile from reporting an error due to excessive voltage and ending charging. It should be noted that the reduced BCL request current can be greater than 0A, so that the time when the charging pile has no current output can be shortened.

[0097] Load dumping is an abnormal voltage output condition. When a short circuit occurs at any point in the charging circuit while the charging pile is continuously charging the vehicle's high-voltage battery, the high-voltage battery is disconnected from the circuit as a load, but the charging pile is still outputting power. At this time, a short-term unexpected voltage will be generated at the end of the charging pile close to the breakpoint, which will be higher than the charging voltage when the high-voltage battery is not disconnected. For example, if the charging voltage is 400V and load dumping occurs, the voltage at the charging pile end will rise to more than 400V in a short period of time, and the greater the charging current, the greater the voltage generated by the load dump. Many charging piles will directly exit charging when they detect this abnormal voltage.

[0098] In order to avoid load dump caused by disconnection of the switch, the embodiment of the present disclosure can reduce the BCL request current before disconnecting the switch to prevent excessive voltage from causing the charging pile to report an error and terminate charging.

[0099] Optionally, when it is detected that the charging current drops below a specified current, the embodiment of the present disclosure may disconnect switches K5 and K6, wherein the specified current may be 5 A. At this time, the voltage at the vehicle charging dock will rise briefly due to the load dump of the charging pile, and then stabilize to the BCL request voltage Uchr.

[0100] In this process, when it is detected that the voltage at the charging seat end (charging port power supply) = BCL request voltage (battery charging request voltage) = Uchr (maximum voltage of the charging pile), the embodiment of the present disclosure can close switches S5 and S6. Since the booster controls the charging voltage, the voltage at the vehicle charging seat end will be reduced to Ucin = Uchr charging pile maximum voltage - 20V.

[0101] At this time, the vehicle can use a booster to boost the voltage of the battery pack for charging, and at the same time, the BCL requested current can be restored to the maximum allowable charging current of the vehicle, that is, the requested current for restoring the battery charging demand. When the vehicle enters boost charging, although the voltage of the battery pack will increase as the battery level increases, the booster can control the voltage at the charging socket end to be Uchr charging pile maximum voltage - 20V, so as to ensure the smooth progress of charging.

[0102] In step S240, when the maximum voltage of the charging pile cannot be successfully obtained, the first voltage of the battery pack is obtained, and the maximum voltage of the charging pile is estimated to obtain a third voltage.

[0103] As an alternative, when the maximum voltage of the charging pile cannot be successfully obtained, the embodiments of the present disclosure can also obtain the first voltage of the battery pack, that is, obtain the current voltage of the battery pack, and at the same time, the maximum voltage of the charging pile can be estimated, that is, estimate the third voltage of the charging pile.

[0104] Since the maximum voltage of the charging pile is unknown, the charging pile can be regarded as a charging pile with a minimum voltage platform, that is, the vehicle can enter boost charging. At this time, the BCL requested voltage can be the minimum requested voltage, and the minimum requested voltage can be the voltage of the charging pile with the lowest output voltage on the market. For example, the minimum requested voltage can be 400V.

[0105] In addition, the BCL requested current can be the maximum allowable charging current of the vehicle. The booster control voltage (capacitor voltage) Ucin = Uchr' - specified voltage, where Uchr' can be the estimated third voltage. For example, the booster voltage Ucin = 400V - 20V = 380V. Here, a 20V voltage difference can be maintained between the BCL requested voltage and Ucin to prevent too large a voltage difference when closing switches K5 and K6. This stage is executed according to the minimum Uchr' = 400V on the market.

[0106] The embodiments of the present disclosure can gradually increase the BCL requested voltage and the booster control voltage Ucin to probe the charging pile Uchr'. Since charging is performed through the booster, the voltage Ucin of the booster < Ucur (the first voltage) to form a voltage difference to ensure the smooth execution of boost charging.

[0107] It should be noted that the basis for judging the true Uchr' can be: when the booster control voltage is increased to a certain value, the current output of the charging pile is interrupted, which means that the maximum voltage of the charging pile is reached. The main reason is that when the voltage at the vehicle charging socket exceeds Uchr', charging cannot output current.

[0108] In the embodiment of the present disclosure, the estimated third voltage has three situations as shown in Table 3. Based on Table 3, it can be known that the relationship between the first voltage and the third voltage is different, and the corresponding charging strategy is also different. The specific method of determining the corresponding charging strategy according to the relationship between the first voltage and the third voltage will be described in detail in the following embodiments, which will not be repeated here.

[0109] Table 3

[0110] In the process of estimating the maximum voltage of the charging pile to obtain the third voltage, the embodiment of the present disclosure can control the booster to gradually raise the voltage. During the raising process, if it is detected that the output current of the charging pile is interrupted, the request voltage of the battery charging requirement when the current output is interrupted is obtained, and the request voltage is used as the third voltage.

[0111] In other words, at the beginning of charging, if it is determined that the maximum voltage of the charging pile cannot be successfully obtained, the embodiment of the present disclosure can control the booster to gradually increase the voltage. During this process, it is determined whether the output current of the charging pile is interrupted. If there is an interruption, the requested voltage of the battery charging requirement when the current is interrupted can be used as the third voltage.

[0112] In step S250 , a target charging strategy is determined according to the relationship between the first voltage and the third voltage.

[0113] As an optional method, in the process of determining the target charging strategy according to the relationship between the first voltage and the third voltage, the embodiment of the present disclosure may determine whether the first voltage is greater than or equal to the third voltage of the charging pile. If it is determined that the first voltage is greater than or equal to the third voltage of the charging pile, the embodiment of the present disclosure may only perform the boost charging operation on the battery pack.

[0114] That is, if it is detected that the estimated maximum voltage (third voltage) of the charging pile is always lower than the current voltage (first voltage) of the battery pack, the embodiment of the present disclosure can directly perform boost charging through the booster.

[0115] As a specific implementation, see Fig.10 , when the third voltage Uchr' ≤ the first voltage Ucur, the embodiment of the present disclosure can adjust the BCL request voltage = Uchr', the booster control voltage Ucin = Uchr'-20V, and the charging pile continues to output current and continue to boost charging. That is to say, if it is determined that the estimated third voltage is always less than the voltage of the battery pack at the current moment, the charging pile can continue to charge the battery pack through the booster.

[0116] As another optional method, if it is determined that the first voltage is less than the maximum voltage of the battery pack, and it is determined that the maximum voltage of the battery pack is less than or equal to the third voltage, the second charging strategy is used as the target charging strategy. The second charging strategy can be used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after mode switching.

[0117] Specifically, when the third voltage is continuously updated through trial and error, if it is detected that the first voltage is less than the maximum voltage of the battery pack, and the first voltage is less than or equal to the estimated third voltage, then the embodiment of the present disclosure can use the second charging strategy as the target charging strategy. The second charging strategy can be used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after mode switching.

[0118] Here, the second charging strategy may include: when it is detected that the third voltage is greater than the first voltage, switching the mode from boost charging to direct charging. Specifically, when the estimated third voltage is less than or equal to the first voltage, the embodiment of the present disclosure may use the booster to boost charge the battery pack and update the third voltage. If it is determined that the updated third voltage is greater than the first voltage, the embodiment of the present disclosure may instruct the charging pile to directly charge the battery pack.

[0119] The mode switching of the second charging strategy may include: when it is determined that the capacitor voltage of the booster is equal to the first voltage, reducing the requested current of the battery charging requirement, and on this basis, if it is determined that the voltage at the charging seat end of the vehicle is equal to the requested voltage of the battery charging requirement, and is greater than the first voltage by a fixed voltage value, then the embodiment of the present disclosure can reduce the voltage at the charging seat end to the first voltage and restore the maximum allowable charging current of the battery charging requirement.

[0120] As an example, a fixed voltage value of the first voltage can be the first voltage, that is, when it is determined that the voltage at the charging dock end of the vehicle is equal to the requested voltage of the battery charging requirement, if it is determined that both are greater than the first voltage, the embodiment of the present disclosure can reduce the voltage at the charging dock end to the first voltage and restore the maximum allowable charging current required for the battery charging.

[0121] As another example, the first voltage fixed voltage value may be the sum of the first voltage and the preset value, that is, when it is determined that the voltage at the charging dock of the vehicle is equal to the requested voltage of the battery charging requirement, if it is determined that both are equal to the first voltage fixed voltage value, the embodiment of the present disclosure may reduce the voltage at the charging dock to the first voltage and restore the maximum allowable charging current required by the battery charging. For example, the first voltage fixed voltage value = the first voltage + 20V.

[0122] As a specific implementation, see Fig.11, it is determined that the estimated third voltage Uchr'> the first voltage Ucur, then the mode can be switched to switch the boost charging to direct charging. In addition, when it is determined that the capacitor voltage Ucin of the booster = the first voltage Ucur, the embodiment of the present disclosure can reduce the BCL request current to a smaller value, and the smaller value can be in the range of (1-5)A.

[0123] Optionally, when it is detected that the charging current drops below 5A, the embodiment of the present disclosure can disconnect switches S5 and S6. At this time, the voltage at the vehicle charging seat end will briefly increase due to the load dumping of the charging pile, and then stabilize to the BCL requested voltage Ucur+20V.

[0124] In addition, when it is detected that the voltage at the charging dock of the vehicle = BCL request voltage = Ucur + 20V, the embodiment of the present disclosure can close switches K5 and K6. Since the high-voltage battery controls the charging voltage, the voltage at the charging dock of the vehicle will be reduced to Ucur. On this basis, the charging pile can start charging the battery, and the BCL request current is restored to the maximum allowable charging current of the vehicle.

[0125] From the above introduction, we know that as the charging process progresses, the first voltage of the battery pack will increase, that is, the first voltage Ucur will gradually approach the maximum voltage Umax of the battery pack. At this time, the embodiment of the present disclosure can determine whether the maximum voltage of the battery pack is less than or equal to the updated third voltage. If it is less than, continue to charge in the direct charging mode.

[0126] Exemplarily, if it is determined that the maximum voltage Umax of the battery pack is ≤ the third voltage Uchr', direct charging continues, that is, during the charging process when the first voltage Ucur is increased to the maximum voltage Umax of the battery pack, the charging pile can output current.

[0127] As another optional method, when it is determined that the first voltage is less than the third voltage, and the third voltage is less than the maximum voltage of the battery pack, the embodiment of the present disclosure can use the third charging strategy as the target charging strategy. The third charging strategy can be used to instruct the battery pack to first perform a boost charging operation, then perform a direct charging operation after a mode switch, and then perform a boost charging after a second mode switch.

[0128] That is to say, the disclosed embodiment can charge the battery pack of the vehicle according to the third charging strategy. Specifically, it is known from the above introduction that when it is determined that the estimated third voltage is less than or equal to the first voltage, the disclosed embodiment can use the booster to boost and charge the battery pack and update the third voltage. Afterwards, if it is determined that the updated third voltage is greater than the first voltage and the charging pile has current output, the disclosed embodiment can instruct the charging pile to directly charge the battery pack, and the third voltage can continue to be updated at this time.

[0129] On this basis, it is determined that when the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, if a current interruption is detected in the charging pile, a second mode switch is performed to switch the DC charging to boost charging.

[0130] As a specific implementation, see Fig.12 If it is determined that the first voltage is less than the third voltage, and the third voltage Uchr'<the maximum voltage Umax of the battery pack, the mode is switched. That is to say, during the charging process, when the current battery voltage Ucur is increased to Umax, when the first voltage Ucur = the third voltage Uchr'<the maximum voltage Umax of the battery pack, if the output current interruption of the charging pile is detected, it means that the current third voltage has reached the maximum voltage of the charging pile, and boost charging can be performed at this time.

[0131] Specifically, the disclosed embodiment can first reduce the BCL request current to a smaller value, which can be in the range of (1-5) A. When the actual charging current is detected to be ≤5A, the capacitor voltage of the booster Cin is increased to Uchr'-20V, so that Ucin= Uchr'-20V. At this time, switch K5 and switch K6 can be disconnected. The voltage at the charging seat is stabilized at Uchr', and even if the BCL request voltage is Uchr'+20V, the charging pile can only output its maximum voltage Uchr'.

[0132] On this basis, the embodiment of the present disclosure can close the switch S5 and the switch S6. Since the booster Cin can control the charging voltage, the voltage at the vehicle charging dock end will be reduced to Ucin = Uchr'-20V, and the BCL request voltage can be reduced to Uchr'. At this time, the booster can start to perform boost charging to charge the battery pack, and the BCL request current can be restored to the maximum allowable charging current of the vehicle.

[0133] In summary, the disclosed embodiments can not only avoid enabling the booster for boost charging when the minimum battery voltage < current voltage < maximum voltage of the charging pile, but also avoid the booster entering the direct charging mode when the maximum voltage of the charging pile cannot be successfully obtained, thereby avoiding sacrificing charging performance.

[0134] In step S260 , the battery pack of the vehicle is charged according to the target charging strategy.

[0135] The specific implementation of step S260 has been described in detail in the above embodiment and will not be repeated here.

[0136] The disclosed embodiment can simultaneously adjust the charging message parameters and switch the vehicle charging mode. When the minimum voltage of the battery pack < the current voltage of the battery pack < the maximum voltage of the charging pile < the maximum voltage of the battery pack, charging with a booster is avoided, and the vehicle direct charging circuit can be used for charging, thereby improving the vehicle charging performance.

[0137] Figure 7 is a block diagram of a charging circuit according to an exemplary embodiment. Figure 7 It can be seen that the charging circuit 700 may include a battery pack 710, a booster 720, a first switch S5, a second switch S6, a third switch K5 and a fourth switch K6.

[0138] Among them, the first end of the booster 720 is connected to the positive electrode of the battery pack 710, and the second end of the booster 720 is connected to the negative electrode of the battery pack; the first end of the first switch S5 is connected to the third end of the booster 720, and the second end of the first switch S5 is connected to the positive electrode of the charging base end of the charging pile; the first end of the second switch S6 is connected to the fourth end of the booster 720, and the second end of the second switch S6 is connected to the negative electrode of the charging base end; the first end of the third switch K5 is connected to the positive electrode of the battery pack 710, and the second end of the third switch K5 is connected to the negative electrode of the charging base end; the first end of the fourth switch K6 is connected to the positive electrode of the battery pack 710, and the second end of the fourth switch K6 is connected to the negative electrode of the charging base end.

[0139] In some embodiments, the charging circuit 700 is configured to: When the maximum voltage of the charging pile is successfully obtained and it is detected that the first voltage of the battery pack 710 is less than the second voltage of the charging pile, the third switch K5 and the fourth switch K6 are controlled to be closed, and the first switch S5 and the second switch S6 are controlled to be disconnected; when it is determined that the first voltage is equal to the second voltage, the mode is switched, the third switch K5 and the fourth switch K6 are controlled to be disconnected, and the first switch S5 and the second switch S6 are controlled to be closed.

[0140] In some embodiments, the charging circuit 700 is further configured to: When the maximum voltage of the charging pile cannot be successfully obtained and it is detected that the estimated third voltage is less than or equal to the first voltage of the battery pack 710, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be disconnected, and the third voltage is the voltage obtained by estimating the maximum voltage of the charging pile; when it is detected that the third voltage is greater than the first voltage, the mode is switched, the first switch S5 and the second switch S6 are controlled to be disconnected, and the third switch K5 and the fourth switch K6 are controlled to be closed.

[0141] In some embodiments, the charging circuit 700 is further configured to: When the maximum voltage of the charging pile cannot be successfully obtained, and it is determined that the estimated third voltage detected is less than or equal to the first voltage of the battery pack 710, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be disconnected, and the third voltage is a voltage obtained by estimating the maximum voltage of the charging pile; when it is detected that the third voltage is greater than the first voltage, the mode is switched, the first switch S5 and the second switch S6 are controlled to be disconnected, and the third switch K5 and the fourth switch K6 are controlled to be closed; when it is determined that the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack 710, the current of the charging pile is interrupted, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be disconnected.

[0142] Fig.13 FIG. 1 is a block diagram of a charging device for a vehicle according to an exemplary embodiment. Fig.13 The device includes an acquisition module 310 and a charging module 320.

[0143] The acquisition module 310 is configured to acquire the maximum voltage of the charging pile in response to the connection operation between the vehicle and the charging pile; The charging module 320 is configured to determine a target charging strategy based on the maximum voltage state of the charging pile, and charge the battery pack of the vehicle according to the target charging strategy.

[0144] In some embodiments, the charging module 320 may include: a voltage acquisition submodule, configured to acquire a first voltage of the battery pack when the maximum voltage of the charging pile is successfully acquired, wherein the first voltage is the voltage of the battery pack at a current moment; The first strategy determination submodule is configured to determine that when the first voltage is less than the second voltage of the charging pile and the second voltage is less than the maximum voltage of the battery pack, the first charging strategy is used as the target charging strategy, the first charging strategy is used to instruct the battery pack to first perform a direct charging operation and then a boost charging operation, and the second voltage is a fixed voltage value that is less than the maximum voltage of the charging pile.

[0145] In some embodiments, the charging module 320 is also configured to instruct the charging pile to directly charge the battery pack when it detects that the first voltage is less than the second voltage; when it detects that the first voltage is equal to the second voltage, switch the mode and use the booster of the vehicle to boost and charge the battery pack.

[0146] In some embodiments, the charging module 320 is also configured to increase the capacitor voltage of the booster to be equal to the second voltage; reduce the requested current of the battery charging requirement; and when the voltage at the charging seat end of the vehicle and the requested voltage of the battery charging requirement are equal to the maximum voltage of the charging pile, use the booster to boost charge the battery pack and restore the requested current of the battery charging requirement.

[0147] In some embodiments, the charging module 320 is further configured to instruct the battery pack to perform a direct charging operation when it is determined that the maximum voltage of the battery pack is less than the maximum voltage of the charging pile.

[0148] In some embodiments, the charging module 320 is further configured to instruct the battery pack to perform a boost charging operation when it is determined that the first voltage of the battery pack is greater than the maximum voltage of the charging pile.

[0149] In some embodiments, the voltage acquisition submodule is further configured to acquire the first voltage of the battery pack and estimate the maximum voltage of the charging pile to obtain a third voltage when the maximum voltage of the charging pile cannot be successfully acquired; The charging module 320 may further include: The second strategy determination submodule is configured to determine the target charging strategy according to the relationship between the first voltage and the third voltage.

[0150] In some embodiments, the voltage acquisition submodule is also configured to control the booster to gradually increase the voltage. If it is detected that the output current of the charging pile is interrupted during the increasing process, the requested voltage of the battery charging requirement when the current output is interrupted is obtained, and the requested voltage is used as the third voltage.

[0151] In some embodiments, the charging module 320 is also configured to use a second charging strategy as the target charging strategy when it is determined that the first voltage is less than the maximum voltage of the battery pack and the maximum voltage of the battery pack is less than or equal to the third voltage. The second charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after mode switching.

[0152] In some embodiments, the charging module 320 is further configured to perform a mode switch to switch the boost charging to the direct charging when it is detected that the third voltage is greater than the first voltage.

[0153] In some embodiments, the charging module 320 is also configured to reduce the requested current of the battery charging requirement when the capacitor voltage of the booster is equal to the first voltage; when the voltage at the charging dock end of the vehicle is equal to the requested voltage of the battery charging requirement and is greater than the first voltage by a fixed voltage value, reduce the voltage of the charging dock end to the first voltage and restore the maximum allowable charging current of the battery charging requirement.

[0154] In some embodiments, the charging module 320 is further configured to determine that the first voltage is less than the third voltage, and the third voltage is less than the maximum voltage of the battery pack, and to use a third charging strategy as the target charging strategy. The third charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after a mode switch, and then perform a boost charging after a second mode switch.

[0155] In some embodiments, the charging module 320 is further configured to determine that when the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, a current interruption occurs in the charging pile, and the second mode switching is performed to switch DC charging to boost charging.

[0156] In some embodiments, the charging module 320 is further configured to instruct the battery pack to perform a boost charging operation when it is determined that the first voltage is greater than or equal to a third voltage of the charging pile.

[0157] The disclosed embodiments can adopt different charging strategies for different maximum voltage states of the charging pile, which can improve the performance of vehicle charging. Specifically, in response to the connection operation between the vehicle and the charging pile, the maximum voltage state of the charging pile is obtained. On this basis, the corresponding target charging strategy is determined according to the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy. That is, different charging strategies are adopted corresponding to different maximum voltage states of the charging pile. This can not only improve the flexibility of vehicle charging, but also improve the charging efficiency.

[0158] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0159] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the vehicle charging method provided by the present disclosure.

[0160] Fig.14 6 is a block diagram of a vehicle 600 according to an exemplary embodiment. For example, the vehicle 600 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0161] Reference Fig.14 , the vehicle 600 may include various subsystems, for example, 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 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 600 may be interconnected by wire or wireless means.

[0162] In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, and a navigation system, among others.

[0163] The perception system 620 may include several sensors for sensing information about the environment around the vehicle 600. For example, the perception system 620 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0164] The decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0165] The drive system 640 may include components that provide powered motion for the vehicle 600. In one embodiment, the drive system 640 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0166] Some or all functions of the vehicle 600 are controlled by a computing platform 650. The computing platform 650 may include at least one processor 651 and a memory 652, and the processor 651 may execute instructions 653 stored in the memory 652.

[0167] The processor 651 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0168] The memory 652 may be implemented by any type of volatile or nonvolatile memory device 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.

[0169] In addition to the instructions 653 , the memory 652 may also store data, such as road maps, route information, and data such as the location, direction, and speed of the vehicle. The data stored in the memory 652 may be used by the computing platform 650 .

[0170] In the embodiment of the present disclosure, the processor 651 can execute instruction 653 to complete all or part of the steps of the above-mentioned vehicle charging method.

[0171] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned vehicle charging method when executed by the programmable device.

[0172] Some embodiments of the present disclosure also provide a chip system, such as Fig.14As shown, the chip system includes at least one processor 1301 and at least one interface circuit 1302. The processor 1301 and the interface circuit 1302 can be interconnected through lines. For example, the interface circuit 1302 can be used to receive signals from other devices (such as the memory of an electronic device). For another example, the interface circuit 1302 can be used to send signals to other devices (such as the processor 1301). Exemplarily, the interface circuit 1302 can read the instructions stored in the memory and send the instructions to the processor 1301. When the instructions are executed by the processor 1301, the charging device of the vehicle can execute the various steps in the above embodiments. Of course, the chip system can also include other discrete devices, and some embodiments of the present disclosure are not specifically limited to this.

[0173] In some embodiments of the present disclosure, the interface circuit 1302 can obtain data, program instructions and / or information from the internal storage area of ​​the chip system; it can also obtain data, program instructions and / or information from outside the chip system.

[0174] Optionally, the chip system may also include a memory for storing necessary computer programs and data.

[0175] Those skilled in the art may also understand that the various illustrative logical blocks and steps listed in the embodiments of the present application may be implemented by electronic hardware, computer software, or a combination of the two. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the functions described for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present application.

[0176] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0177] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0178] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0179] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0180] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0181] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A method for charging a vehicle, characterized in that: include: In response to a connection operation between the vehicle and the charging pile, obtaining a maximum voltage of the charging pile; A target charging strategy is determined based on the maximum voltage state of the charging pile, and the battery pack of the vehicle is charged according to the target charging strategy.

2. The vehicle charging method according to claim 1, characterized in that: The step of determining a target charging strategy based on obtaining the maximum voltage state of the charging pile includes: When the maximum voltage of the charging pile is successfully obtained, a first voltage of the battery pack is obtained, where the first voltage is the voltage of the battery pack at the current moment; When it is determined that the first voltage is less than the second voltage of the charging pile, and the second voltage is less than the maximum voltage of the battery pack, the first charging strategy is used as the target charging strategy. The first charging strategy is used to instruct the battery pack to first perform a direct charging operation and then a boost charging operation. The second voltage is a fixed voltage value that is less than the maximum voltage of the charging pile.

3. The vehicle charging method according to claim 2, characterized in that: The first charging strategy includes: When detecting that the first voltage is less than the second voltage, instructing the charging pile to directly charge the battery pack; When it is detected that the first voltage is equal to the second voltage, a mode switch is performed, and the booster of the vehicle is used to boost and charge the battery pack.

4. The vehicle charging method according to claim 3, characterized in that: The step of boosting and charging the battery pack by using the booster of the vehicle includes: increasing the capacitor voltage of the booster to be equal to the second voltage; Reduce the requested current for battery charging needs; When the voltage at the charging seat end of the vehicle and the requested voltage of the battery charging requirement are equal to the maximum voltage of the charging pile, the booster is used to boost and charge the battery pack and restore the requested current of the battery charging requirement.

5. The vehicle charging method according to claim 1, characterized in that: The method further comprises: When it is determined that the maximum voltage of the battery pack is less than the maximum voltage of the charging pile, the battery pack is instructed to perform a direct charging operation.

6. The vehicle charging method according to claim 1, characterized in that: The method further comprises: When it is determined that the first voltage of the battery pack is greater than the maximum voltage of the charging pile, the battery pack is instructed to perform a boost charging operation.

7. The vehicle charging method according to claim 1, characterized in that: The step of determining a target charging strategy based on obtaining the maximum voltage state of the charging pile includes: When the maximum voltage of the charging pile cannot be successfully obtained, obtaining the first voltage of the battery pack and estimating the maximum voltage of the charging pile to obtain a third voltage; The target charging strategy is determined according to a relationship between the first voltage and the third voltage.

8. The vehicle charging method according to claim 7, characterized in that: The estimating the maximum voltage of the charging pile to obtain a third voltage includes: The booster is controlled to gradually increase the voltage. During the increasing process, if it is detected that the output current of the charging pile is interrupted, the requested voltage of the battery charging requirement when the current output is interrupted is obtained, and the requested voltage is used as the third voltage.

9. The vehicle charging method according to claim 7, characterized in that: The determining the target charging strategy according to the relationship between the first voltage and the third voltage includes: When it is determined that the first voltage is less than the maximum voltage of the battery pack, and the maximum voltage of the battery pack is less than or equal to the third voltage, the second charging strategy is used as the target charging strategy, and the second charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after mode switching.

10. The vehicle charging method according to claim 9, characterized in that: The second charging strategy includes: When it is detected that the third voltage is greater than the first voltage, a mode switching is performed to switch the boost charging to the direct charging.

11. The vehicle charging method according to claim 10, characterized in that: The mode switching of the second charging strategy includes: When the capacitor voltage of the booster is equal to the first voltage, reducing the requested current for battery charging; When the voltage at the charging station terminal of the vehicle is equal to the requested voltage of the battery charging requirement and is greater than the first voltage by a fixed voltage value, the voltage at the charging station terminal is reduced to the first voltage and the maximum allowable charging current of the battery charging requirement is restored.

12. The vehicle charging method according to claim 7, characterized in that: The determining the target charging strategy according to the relationship between the first voltage and the third voltage includes: Determine that the first voltage is less than the third voltage, and the third voltage is less than the maximum voltage of the battery pack, and use the third charging strategy as the target charging strategy. The third charging strategy is used to instruct the battery pack to first perform a boost charging operation, and then perform a direct charging operation after a mode switch, and then perform a boost charging after a second mode switch.

13. The vehicle charging method according to claim 12, characterized in that: The third charging strategy includes: It is determined that when the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, a current interruption occurs in the charging pile, and the second mode switching is performed to switch the DC charging to the boost charging.

14. The vehicle charging method according to claim 7, characterized in that: The method further comprises: When it is determined that the first voltage is greater than or equal to the third voltage of the charging pile, it is used to instruct the battery pack to perform a boost charging operation.

15. A vehicle charging device, characterized in that: include: an acquisition module, configured to acquire a maximum voltage of the charging pile in response to a connection operation between the vehicle and the charging pile; The charging module is configured to determine a target charging strategy based on the maximum voltage state of the charging pile, and charge the battery pack of the vehicle according to the target charging strategy.

16. A charging circuit, characterized in that: The charging circuit comprises: Battery pack; A booster, wherein a first end of the booster is connected to the positive electrode of the battery pack, and a second end of the booster is connected to the negative electrode of the battery pack; A first switch S5, wherein a first end of the first switch S5 is connected to the third end of the booster, and a second end of the first switch S5 is connected to the positive electrode of the charging seat end of the charging pile; a second switch S6, wherein a first end of the second switch S6 is connected to the fourth end of the booster, and a second end of the second switch S6 is connected to the negative electrode of the charging base; A third switch K5, wherein a first end of the third switch K5 is connected to the positive electrode of the battery pack, and a second end of the third switch K5 is connected to the negative electrode of the charging base; A fourth switch K6, wherein a first end of the fourth switch K6 is connected to the positive electrode of the battery pack, and a second end of the fourth switch K6 is connected to the negative electrode of the charging base.

17. The charging circuit according to claim 16, characterized in that: The charging circuit is configured as follows: When the maximum voltage of the charging pile is successfully obtained and it is detected that the first voltage of the battery pack is less than the second voltage of the charging pile, the third switch K5 and the fourth switch K6 are controlled to be closed, and the first switch S5 and the second switch S6 are controlled to be opened; When it is determined that the first voltage is equal to the second voltage, mode switching is performed, the third switch K5 and the fourth switch K6 are controlled to be opened, and the first switch S5 and the second switch S6 are controlled to be closed.

18. The charging circuit according to claim 16, characterized in that: The charging circuit is further configured as: When the maximum voltage of the charging pile cannot be successfully obtained, and it is detected that the estimated third voltage is less than or equal to the first voltage of the battery pack, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened, and the third voltage is a voltage estimated and obtained for the maximum voltage of the charging pile; When it is detected that the third voltage is greater than the first voltage, mode switching is performed, the first switch S5 and the second switch S6 are controlled to be opened, and the third switch K5 and the fourth switch K6 are controlled to be closed.

19. The charging circuit according to claim 16, characterized in that: The charging circuit is further configured as: When the maximum voltage of the charging pile cannot be successfully obtained, and it is determined that the estimated third voltage is less than or equal to the first voltage of the battery pack, the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened, and the third voltage is a voltage estimated and obtained for the maximum voltage of the charging pile; When it is detected that the third voltage is greater than the first voltage, a mode switch is performed, the first switch S5 and the second switch S6 are controlled to be disconnected, and the third switch K5 and the fourth switch K6 are controlled to be closed; When it is determined that the first voltage is equal to the third voltage and less than the maximum voltage of the battery pack, a current interruption occurs in the charging pile, and the first switch S5 and the second switch S6 are controlled to be closed, and the third switch K5 and the fourth switch K6 are controlled to be opened.

20. A vehicle, characterized in that: The charging circuit comprises any one of claims 16 to 19.

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