Battery pack charging method and device, vehicle, medium and program product

Abstract

The invention provides a battery pack charging method and device, a vehicle, a medium and a program product, and relates to the technical field of batteries, the battery pack comprises a plurality of battery packs, the plurality of battery packs can be connected in series or in parallel, the electrical properties of at least two of the plurality of battery packs are different, and the charging information of the battery pack is obtained; the charging information can comprise the charging demand of each battery pack, under the condition that the battery pack is connected with the charging pile, according to the charging demand of each battery pack and the charging capacity of the charging pile, each battery pack is charged according to the priority, the charging demands of different battery packs in the battery pack are met in batches, the charging efficiency of each battery pack is optimized, and the charging efficiency of each battery pack is improved. Therefore, the overall charging speed of the battery pack is improved.

Description

Technical Field

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

[0002] Electric vehicles have built-in battery packs, which are used to propel the vehicle forward. The energy stored in these packs is supplied by charging stations. However, utilizing the charging capacity of these stations to quickly charge the batteries remains a pressing issue. Summary of the Invention

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

[0004] According to a first aspect of an embodiment of the present disclosure, a battery pack charging method is provided, wherein the battery pack includes multiple battery groups, at least two of the multiple battery groups have different electrical properties, and the multiple battery groups can be connected in series or in parallel. The method includes: obtaining charging information of the battery pack, wherein the charging information includes the charging requirements of each of the battery groups; when the battery pack is connected to a charging pile, charging each battery pack according to priority based on the charging information requirements of each battery group and the charging capacity of the charging pile.

[0005] In this embodiment, the battery pack includes multiple battery groups, and the multiple battery groups can be connected in series or in parallel. There is a difference in electrical performance between at least two of the multiple battery groups. Charging information of the battery pack is obtained. The charging information may include the charging requirements of each battery group. When the battery pack is connected to the charging pile, each battery group is charged according to the charging requirements of each battery group and the charging capacity of the charging pile according to the priority. The charging requirements of different battery groups in the battery pack are met in batches, and the charging efficiency of each battery group is optimized, thereby improving the overall charging speed of the battery pack.

[0006] In this embodiment, different battery groups in the battery pack correspond to different priorities, and the charging needs of the battery packs with high priorities are met first. After charging the battery packs with high priorities, the battery packs with low priorities are charged according to their charging needs. By meeting the charging needs of different battery groups in the battery pack in batches, the charging efficiency is optimized.

[0007] In some possible implementations, charging the battery packs according to priority includes: when charging a battery pack of any priority, if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack, charging the battery pack with the charging capacity that meets the charging demand; and using the remaining charging capacity of the charging pile to charge the battery pack of the next priority level above the battery pack.

[0008] In this embodiment, when charging a battery pack of any priority, if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack, the battery pack will be charged with the charging capacity that meets the charging demand, and at the same time, the remaining charging capacity of the charging pile will be used to charge the battery pack of the next priority of the battery pack. Multiple battery packs are charged simultaneously to improve the charging efficiency of the battery pack.

[0009] In some possible implementations, charging the battery packs according to priority includes: after charging a battery pack of a priority level to a first preset battery state of charge (SOC) threshold, switching to charging a battery pack of a next priority level.

[0010] In this embodiment, after a battery pack of a priority level is charged to a first preset battery state of charge (SOC) threshold, charging is switched to a battery pack of the next priority level to meet the charging requirements of different battery packs in batches.

[0011] In some possible implementations, the charging information includes a charging rate of each of the battery packs, wherein the charging rate is positively correlated with the priority of the battery pack.

[0012] In this embodiment, the charging rate is positively correlated with the priority of the battery pack. The battery pack with a high charging rate has a high priority. The battery pack with a high charging rate can be charged first. When the battery pack is not fully charged, the charging pile is unplugged to ensure that as much electrical energy as possible is stored in the battery pack, thereby improving the battery pack's range.

[0013] In some possible implementations, the charging information further includes the capacity of each of the battery packs, wherein the capacity is inversely correlated with the priority of the battery pack.

[0014] In some possible implementations, the charging requirements of each battery group and the charging capacity of the charging pile are used to charge each battery group according to priority, including: when the charging pile charges the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging requirement of the first battery group, determining whether there is a battery group in the battery pack whose SOC value is greater than a first preset SOC threshold; if there is a second battery group in the battery pack whose SOC value is greater than the first preset SOC threshold, controlling the charging pile and the second battery group to charge the first battery group together.

[0015] In this embodiment, when the charging pile charges the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging demand of the first battery group, a second battery group whose SOC value is greater than the first preset SOC threshold is determined, and the first battery group is charged jointly by the charging pile and the second battery group to ensure the charging demand of the first battery group.

[0016] In some possible embodiments, the battery pack charging method further includes: in the process of the charging pile and the second battery group jointly charging the first battery group, if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold, the charging pile is used to charge the second battery group preferentially according to the charging requirements of the second battery group.

[0017] In this embodiment, when the charging pile and the second battery pack are jointly charging the first battery pack, if the SOC value of the second battery pack drops to less than or equal to the second preset SOC threshold, the charging pile is used to charge the second battery pack in priority according to the charging needs of the second battery pack, thereby ensuring the charging needs of the second battery pack while allowing the charging of the battery pack to continue.

[0018] In some possible embodiments, the battery pack charging method further includes: in the process of the charging pile and the second battery group jointly charging the first battery group, if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold, determining whether the remaining charging time of the first battery group is less than the remaining charging time of the second battery group; if the remaining charging time of the first battery group is less than the remaining charging time of the second battery group, using the maximum charging capacity of the charging pile to charge both the first battery group and the second battery group.

[0019] In this embodiment, when the SOC value of the second battery pack drops to less than or equal to the second preset SOC threshold, if the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack, the first battery pack and the second battery pack are both charged using the maximum charging capacity of the charging pile to complete the charging of the battery pack.

[0020] According to a second aspect of an embodiment of the present disclosure, a battery pack charging device is provided, wherein the battery pack includes a plurality of battery groups, at least two of the plurality of battery groups have different electrical properties, and the plurality of battery groups can be connected in series or in parallel, including: an acquisition module configured to acquire charging information of the battery pack, wherein the charging information includes the charging requirements of each of the battery groups; and a charging module configured to charge each battery pack according to priority based on the charging requirements of each battery group and the charging capacity of the charging pile when the battery pack is connected to a charging pile.

[0021] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to implement the steps of the method described in the first aspect when executing the instructions.

[0022] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the battery pack charging method provided in the first aspect of the present disclosure are implemented.

[0023] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, which implements the steps of the method described in the first aspect when executed by a processor.

[0024] 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 disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 The figure is a flow chart showing a battery pack charging method according to an exemplary embodiment.

[0027] Figure 2 1 is a schematic diagram of a battery pack charging circuit provided in an embodiment of the present disclosure.

[0028] Figure 3 2 is a schematic diagram of a battery pack charging circuit provided in another embodiment of the present disclosure.

[0029] Figure 4 2 is a schematic diagram of a battery pack charging circuit provided in another embodiment of the present disclosure.

[0030] Figure 5 is a flowchart of a battery pack charging method according to another exemplary embodiment.

[0031] Figure 6 The figure is a block diagram of a battery pack charging device according to an exemplary embodiment.

[0032] Figure 7 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0034] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0035] Electric vehicles have built-in battery packs, which are used to propel the vehicle through discharge. The energy in the battery packs is supplied by charging stations. To increase charging speeds, supercharged battery packs have emerged, with battery packs offering 3C (C stands for charge rate), 4C, 5C, and 10C charge rates.

[0036] The infrastructure capacity of traditional charging piles remains relatively low. According to survey statistics, 60kW charging piles account for approximately 58.9%, 60kW-120kW charging piles account for approximately 12.1%, and 140kW-480kW charging piles account for approximately 6.7%. This suggests that charging piles with high charging capacity are relatively rare, partly due to the high construction costs of these types of charging piles and partly due to limitations in factors such as grid capacity and vehicle compatibility.

[0037] With the development of supercharged battery packs, there are obvious compatibility issues between traditional charging piles and supercharged batteries. Traditional charging piles cannot meet the charging needs of such battery packs. For example, the output power of traditional charging piles is 120kw or 180kw, which cannot meet the high-power charging needs of 600kw battery packs. Low-power charging piles will significantly extend the charging time and affect the charging efficiency of the battery pack. For another example, the design of supercharged battery packs usually takes into account the heat dissipation problem during high-power charging and performs electrochemical optimization for this. Using a low-power charging pile to charge the battery pack for a long time may affect the life of the battery pack.

[0038] To solve the above problems, the present disclosure provides a battery pack charging method, please refer to Figure 2 , the battery pack charging method can be applied to Figure 6 The battery pack charging device 200 shown, Figure 7The vehicle 600, computer program product and computer-readable storage medium shown are shown. In this embodiment, taking the application to a vehicle as an example, the battery pack on the vehicle includes a plurality of battery packs, and the plurality of battery packs can be connected in series or in parallel, and the specific connection relationship can be determined according to the charging requirements. There are differences in the electrical properties of at least two battery packs among the plurality of battery packs, wherein the differences in the electrical properties of at least two battery packs may include at least one of the following: different capacities of at least two battery packs, different charging rates of at least two battery packs, different resistances of at least two battery packs, different charging voltages of at least two battery packs, different charging currents of at least two battery packs, etc., which are not limited here. The following will focus on Figure 1 The process shown in FIG. 1 is described in detail. The battery pack charging method may include the following steps: Step S110 , obtaining charging information of the battery pack, wherein the charging information includes a charging requirement of each of the battery packs.

[0039] The battery pack is equipped with a BMS (Battery Management System) control unit, which monitors the battery pack's charging information. The vehicle communicates with the BMS to obtain charging information from the battery pack. This charging information may include the battery pack's charging requirements, such as the maximum charging voltage, maximum charging current, and maximum charging power.

[0040] The battery pack is divided into multiple battery groups. Multiple battery groups can share a BMS control unit, or each battery group can be configured with a BMS control unit. It is not difficult to understand that the charging information of the battery pack includes the charging requirements of each battery group in the battery pack. For example, the charging requirements of each battery group include the maximum charging voltage, maximum charging current, maximum charging power, etc.

[0041] Step S120 , when the battery pack is connected to the charging pile, charging each battery pack according to the priority according to the charging demand of each battery pack and the charging capacity of the charging pile.

[0042] Different battery groups in the battery pack have different priorities. When the charging gun of the charging pile is inserted into the charging port of the vehicle, the battery pack is connected to the charging pile. When the battery pack is connected to the charging pile, the charging pile is used to charge each battery group according to the charging requirements of each battery group and the charging capacity of the charging pile. It is not difficult to understand that the charging pile gives priority to meeting the charging needs of battery groups with high priority, and then meets the charging needs of battery groups with low priority. By meeting the charging needs of different battery groups in the battery pack in batches, the charging efficiency can be optimized, thereby improving the overall charging speed of the battery pack.

[0043] Since different battery groups in a battery pack have different battery performances, a charging pile charging multiple battery groups may provide different charging currents, voltages, and / or charging powers for different battery groups.

[0044] The battery pack charging method provided in this embodiment includes a plurality of battery groups, which can be connected in series or in parallel, and at least two of the plurality of battery groups have different electrical properties. Charging information of the battery pack is obtained, and the charging information may include the charging requirements of each battery group. When the battery pack is connected to a charging pile, each battery group is charged according to the charging requirements of each battery group and the charging capacity of the charging pile according to the priority, and the charging requirements of different battery groups in the battery pack are met in batches, and the charging efficiency of each battery group is optimized, thereby improving the overall charging speed of the battery pack. In addition, each battery group is charged according to its charging requirements, reducing the impact of the charging process on the service life of each battery group.

[0045] Exemplarily, different battery groups in a battery pack correspond to different priorities. When the battery pack is charged using a charging pile, the charging needs of the battery groups with higher priorities are met first. Then, after the charging of the battery groups with higher priorities meets the first preset SOC threshold, the battery packs with lower priorities are charged according to their charging needs. By meeting the charging needs of different battery groups in the battery pack in batches, the charging efficiency is optimized.

[0046] Optionally, the first SOC threshold may be in the range of 80% to 100%, for example, the first SOC threshold may be 80%, 85%, 90%, 100%, etc. It is readily understood that when the first SOC threshold is 100%, the battery pack satisfies the first SOC threshold and is considered fully charged.

[0047] In this embodiment, different battery groups in the battery pack correspond to different priorities. The charging needs of battery groups with higher priorities are met first, and then the battery groups with lower priorities are charged. By meeting the charging needs of different battery groups in the battery pack in batches, the charging efficiency is optimized.

[0048] As a method, when charging a battery pack of any priority, if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack, the battery pack is charged with the charging capacity that meets the charging demand; and the battery pack of the next priority of the battery pack is charged using the remaining charging capacity of the charging pile.

[0049] The battery pack includes multiple battery groups, and different battery groups correspond to different priorities. If the maximum charging capacity of the charging pile cannot meet the charging needs of the entire battery pack, the battery groups in the battery pack can be charged in batches according to the priority of the battery groups. For example, when charging a battery group of any priority, if the maximum charging capacity of the charging pile can meet the charging needs of the battery group, the battery group will be charged with the charging capacity that meets the charging needs. Conversely, if the maximum charging capacity of the charging pile cannot meet the charging needs of the battery group, the charging pile and other battery groups will be used to charge the battery group together to meet the charging needs of the battery group.

[0050] Optionally, the priority of the other battery packs is higher than the priority of the battery pack, the remaining power of the other battery packs is higher than a preset power, or the SOC value of the other battery packs is higher than a first preset SOC threshold.

[0051] For example, the battery groups include a first battery group of first priority, a second battery group of second priority, and a third battery group of third priority. The priorities decrease in order of first priority, second priority, and third priority. The maximum charging requirement of the first battery group is 2C, the maximum charging requirement of the second battery group is 2C, and the maximum charging requirement of the first battery group is 3C. If the maximum charging capacity of the second battery group of second priority is 4C, and the maximum charging capacity of the charging pile is sufficient to meet the charging requirement of 2C of the battery group, the charging pile is controlled to charge the battery group at the charging capacity that meets the charging requirement of 2C.

[0052] Among them, C refers to the charging rate, which is related to the rated capacity of the battery pack. That is, 1C is the rated capacity. For example, if the rated capacity of the battery pack is 5000mAh, 2C means 10A.

[0053] For example, when a battery pack needs to be connected to a charging pile to charge other battery packs, the relationship between the battery pack and the battery pack being charged can be series connection, and in other cases can be parallel connection.

[0054] Optionally, in order to improve the overall charging efficiency of the battery pack, while the battery pack is charged by the charging pile with the charging capacity to meet the charging demand, the battery pack with the next priority of the battery pack is charged using the remaining charging capacity of the charging pile.

[0055] Among them, the charging capacity of the charging pile may include voltage, current, power, etc.

[0056] Continuing with the above example, when the charging pile is charging the second battery pack at a charging demand of 2C, the remaining charging capacity of the charging pile is 4C-2C=2C. The charging demand of the third battery pack is 3C, but the remaining charging capacity of the charging pile is 2C. The 2C charging capacity can be used to charge the third battery pack, which can improve the charging efficiency of the entire battery pack.

[0057] As another approach, after charging a battery pack of a priority level to a first preset battery state of charge (SOC) threshold, charging is switched to a battery pack of a next priority level.

[0058] In this embodiment, after charging a battery pack of a certain priority level to a first preset battery state of charge (SOC) threshold, the charging is switched to the battery pack of the next priority level, thereby ensuring the charging needs of different battery packs in batches. Here, switching can be understood as the charging pile stopping charging the battery pack of a certain priority level and switching to charging the battery pack of the next priority level.

[0059] Optionally, the first SOC threshold may be in the range of 80% to 100%, for example, the first SOC threshold may be 80%, 85%, 90%, 100%, etc. It is readily understood that when the first SOC threshold is 100%, the battery pack satisfies the first SOC threshold and is considered fully charged.

[0060] When the first SOC threshold is 100%, after charging a battery pack of a priority level to the first SOC threshold of 100%, there is no need to charge the battery pack. The charging pile can provide charging capacity to the battery pack of the next priority level to ensure the charging needs of the battery pack of the next priority level.

[0061] The first SOC threshold may be the SOC value after charging in the high-rate region. The high-rate charging region refers to the SOC range in which the battery pack can accept a higher charging current (i.e., a high C-rate) during charging. In this SOC range, the battery pack can be rapidly charged at a higher charge rate. Therefore, the upper limit of this SOC range may serve as the first SOC threshold. For example, the SOC range may be 20% to 80%, and 80% may serve as the first SOC threshold.

[0062] In this embodiment, the SOC value after the high-rate region charging is completed is used as the first SOC threshold. It can be understood that before a battery pack of a priority level reaches the first SOC threshold, the battery pack can be quickly charged. After the battery pack is charged to reach the first SOC threshold, if the battery pack continues to be charged, the charging speed may be slow, affecting the charging efficiency of the entire battery pack. In this way, switching to fast charging of the battery pack of the next priority level can improve the charging efficiency of the entire battery pack.

[0063] Optionally, the charging information further includes a charging rate of each of the battery packs, wherein the charging rate is positively correlated with the priority of the battery pack.

[0064] The charge rate of a battery pack is related to its material. It's also related to its capacity. For example, if two battery packs are made of the same material, the charge rate of the larger capacity pack will be lower than the smaller capacity pack. A faster charge rate results in faster charging, so you can set a positive correlation between the charge rate and the battery pack's priority: a higher charge rate indicates a higher priority, and vice versa.

[0065] Optionally, the charging information further includes the capacity of each battery pack, wherein the capacity is inversely correlated with the priority of the battery pack. In conjunction with the foregoing, it is readily understood that the higher the capacity and the lower the charge rate, the lower the charging priority. Conversely, the lower the capacity and the higher the charge rate, the higher the charging priority.

[0066] In another embodiment, the charging information includes the charging requirements of each of the battery groups, and step S120 can be as follows: when the charging pile charges the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging requirements of the first battery group, determine whether there is a battery group in the battery pack whose SOC value is greater than a first preset SOC threshold; if there is a second battery group in the battery pack whose SOC value is greater than the first preset SOC threshold, control the charging pile and the second battery group to charge the first battery group together.

[0067] When the charging pile is charging the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging demand of the first battery group, a second battery group whose SOC value is greater than the first preset SOC threshold is determined, and the first battery group is charged jointly by the charging pile and the second battery group to ensure the charging demand of the first battery group and improve the charging speed of the first battery group.

[0068] For example, the first SOC threshold may be in the range of 80% to 100%.

[0069] In another embodiment, the charging information includes the charging requirements of the battery pack, and step S120 may be performed as follows: when the maximum power supply capacity of the charging pile does not meet the charging requirements of the battery pack, each battery pack is charged according to priority.

[0070] When the maximum power supply capacity of the charging pile does not meet the charging needs of the battery pack, the charging pile charges each battery pack in batches according to priority to ensure the charging needs of different battery packs in the battery pack, thereby reducing the loss of battery packs in the battery pack.

[0071] Optionally, the battery pack charging method also includes: in the process of the charging pile and the second battery group jointly charging the first battery group, if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold, the charging pile is used to charge the second battery group preferentially according to the charging requirements of the second battery group.

[0072] At this time, for the first battery pack, combined with the above content, while the charging pile meets the charging needs of the second battery pack, the remaining charging energy of the charging pile can be used to charge the first battery pack. Alternatively, the charging pile can be used to charge only the second battery pack without charging the first battery pack. The first battery pack is in a waiting state. When the second battery pack is charged to a first preset SOC threshold, the charging pile and the second battery pack are used to charge the first battery pack together.

[0073] In this embodiment, when the charging pile and the second battery pack are jointly charging the first battery pack, if the SOC value of the second battery pack drops to less than or equal to the second preset SOC threshold, the charging pile is used to charge the second battery pack in priority according to the charging needs of the second battery pack, thereby ensuring the charging needs of the second battery pack while allowing the charging of the battery pack to continue.

[0074] Optionally, the battery pack charging method also includes: in the process of the charging pile and the second battery group jointly charging the first battery group, if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold, determining whether the remaining charging time of the first battery group is less than the remaining charging time of the second battery group; if the remaining charging time of the first battery group is less than the remaining charging time of the second battery group, using the maximum charging capacity of the charging pile to charge both the first battery group and the second battery group.

[0075] Alternatively, the second preset SOC threshold may be determined based on the lower limit of the SOC interval corresponding to the high-rate region. For example, the SOC interval may be 20% to 80%, and 20% may be used as the second SOC threshold.

[0076] For example, the second preset SOC threshold may be in the range of 0-20%, for example, the second preset threshold may be 0, 10%, 15%, 20%, etc.

[0077] In this embodiment, when the SOC value of the second battery pack drops to less than or equal to the second preset SOC threshold, if the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack, the first battery pack and the second battery pack are both charged using the maximum charging capacity of the charging pile to complete the charging of the battery pack.

[0078] This embodiment takes the battery pack including two battery groups as an example. Figure 2 The battery pack includes a first battery pack Bank1 and a second battery pack Bank2, wherein the energy density of the first battery pack Bank1 is greater than that of the second battery pack Bank2, and the charging rate of the second battery pack Bank2 is greater than that of the first battery pack Bank1. The battery pack may also include a bidirectional transformer. The charging device is connected to the battery pack in the battery pack through a power conversion device, a series-parallel converter, and an inverter. Please continue to refer to Figure 2 The charging device is connected to the first battery pack Bank1 in sequence through a power conversion device, a series-parallel conversion device and an inverter, and the charging device is connected to the second battery pack Bank2 in sequence through a power conversion device, a series-parallel conversion device and an inverter.

[0079] The battery cells of the first battery pack Bank1 may be made of N (Ni, nickel), M (Mn, manganese), and C (Co, cobalt) ternary lithium material, the battery cells of the second battery pack Bank2 may be made of lithium titanate, and the second battery pack Bank2 may be a supercapacitor.

[0080] The charging current provided by the charging device sequentially passes through the power conversion device, the series-parallel conversion device and the converter to supply power to the battery pack (the first battery pack Bank1 and / or the second battery pack Bank2).

[0081] The charging device can be a charging pile or another vehicle. The power conversion device, series-parallel converter and converter can be installed in the charging device or on the vehicle.

[0082] The charged battery pack can power the load, which can include the vehicle's drive motor, air conditioner, etc., as well as mobile phones, tablets, etc. connected to the vehicle.

[0083] The battery pack charging method provided by the present disclosure is Figure 2The battery pack in the charging process can be as follows: if the charging rate of the second battery pack Bank2 is greater than the charging rate of the first battery pack Bank1, then the charging priority of the second battery pack Bank2 can be set to be greater than the charging priority of the first battery pack Bank1. The charging device is a charging pile, and the maximum charging capacity provided by the charging pile does not meet the charging requirements of the battery pack. In the first stage, the charging circuit logic diagram is as follows Figure 3 As shown, according to the charging requirements, the first battery pack and the second battery pack can be connected in parallel, and the charging pile is controlled to charge the second battery pack according to the charging requirements of the second battery pack Bank2, while using the remaining charging capacity of the charging pile to charge the first battery pack Bank1. In the second stage, as shown Figure 4 As shown, based on charging requirements, the first and second battery packs Bank2 can be connected in series. When the state of charge of the second battery pack Bank2 falls below a first preset SOC threshold, charging of the second battery pack Bank2 is stopped. If the maximum charging capacity provided by the charging pile does not meet the charging requirements of the first battery pack Bank1, the charging pile and the second battery pack Bank2 jointly supply power to the first battery pack Bank1.

[0084] When the second battery pack Bank2 is discharged to a level less than a second preset SOC threshold, the first stage charging steps are repeated until the remaining charging time of the first battery pack Bank1 is less than the remaining charging time of the second battery pack Bank2. The first battery pack Bank1 and the second battery pack Bank2 are charged by the charging pile to complete the charging of the battery pack.

[0085] For ease of understanding, the charging demand is taken as an example for explanation. For example, the maximum charging current provided by the charging pile is I13. When the maximum charging current I13 does not meet the charging demand of the battery pack, in the first stage, refer to Figure 3 The charging pile provides a charging current I11 that meets the charging needs of the second battery pack Bank2, charging the second battery pack Bank2. Because the second battery pack Bank2 has a higher charge rate, its charging needs are prioritized, enabling fast charging of the second battery pack Bank2. To increase the overall charging speed of the battery pack, the charging pile's remaining charging capacity (I13-I11=I12) can be used to charge the first battery pack Bank1. Although the charging current I12 may not meet the charging needs of the first battery pack Bank1, it can still increase the overall charging speed of the battery pack.

[0086] When the second battery pack Bank2 is charged to the first preset SOC threshold, the charging pile is controlled to stop charging the second battery pack Bank2, and the charging process enters the second stage. Figure 4If the maximum charging current I13 provided by the charging pile can meet the charging requirements of the first battery pack Bank1, the charging pile can be used to charge the first battery pack Bank1 according to the current required. However, if the maximum charging current I13 provided by the charging pile cannot meet the charging requirements of the first battery pack Bank1, the charging pile output current I13 is used, and the second battery pack Bank2 outputs current I21 to charge the first battery pack Bank1. The charging current that meets the charging requirements of the first battery pack Bank1 is the sum of current I13 and current I21.

[0087] For example, the capacity of the first battery pack Bank1 is 200 Ah, and the maximum charging current required by the first battery pack Bank1 is 1 C. The capacity of the second battery pack Bank2 is 30 Ah, and the maximum charging current required by the second battery pack Bank2 is 5 C.

[0088] This disclosure provides a battery pack charging method, see Figure 5 The battery pack charging method includes: charging detection. Determine whether the handshake with the charging pile is successful. If not, terminate charging; if yes, determine the maximum charging capacity provided by the charging pile. Inquire about the maximum charging requirement of the battery pack.

[0089] Determine whether the maximum charging capacity exceeds the maximum charging demand. If so, both battery packs in the battery pack are charged simultaneously, entering the charging phase. Once charging is complete, terminate charging. If not, prioritize the charging demand of the second battery pack. Use the remaining charging capacity to charge the first battery pack. Charging is completed when the second battery pack is fully charged or in the high-rate charging area. The second battery pack and the charging station simultaneously charge the first battery pack.

[0090] Determine whether the second battery pack has finished discharging and whether the first battery pack is fully charged. If so, recharge the second battery pack.

[0091] If not, the process then determines whether t2 is less than t1, where t2 is the remaining charging time for the second battery pack and t1 is the remaining charging time for the first battery pack. If so, the second battery pack and the charging station simultaneously charge the first battery pack, completing the charging process. If not, the process returns to the step of prioritizing the charging needs of the second battery pack.

[0092] The battery pack charging method provided in this embodiment solves the charging efficiency problem in scenarios where the charging pile power is limited, increases the short-time charging mileage, and shortens the charging time.

[0093] Based on the same inventive concept, the present disclosure provides a battery pack charging device, which is applied to the aforementioned battery pack charging method. The battery pack charging device can be built into the battery pack of a vehicle, or can be set on the vehicle, or can be set on a charging station. Figure 6The battery pack includes a plurality of battery groups, at least two of the plurality of battery groups have different electrical properties, and the plurality of battery groups can be connected in series or in parallel. The battery pack charging device 200 includes: An acquisition module 210 is configured to acquire charging information of the battery pack; The charging module 220 is configured to perform differentiated charging on the multiple battery packs according to the charging information.

[0094] In the battery pack charging device provided in this embodiment, the acquisition module obtains charging information of the battery pack, and the charging module performs differentiated charging on multiple battery groups in the battery pack based on the charging information, thereby improving the charging rate by meeting the charging requirements of the battery groups in the battery pack.

[0095] In one possible implementation, the charging module 220 includes: The first charging module is configured to charge a battery pack of any priority level with a charging capacity sufficient to meet the charging demand if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack; and to use the remaining charging capacity of the charging pile to charge a battery pack of the next priority level to the battery pack.

[0096] In one possible implementation, the charging module includes 220: The second charging module is configured to switch to charging a battery pack of the next priority level after charging the battery pack of the first priority level to a first preset battery state of charge (SOC) threshold.

[0097] In one possible implementation, the charging module includes 220: The third charging module is configured to determine whether there is a battery group in the battery pack whose SOC value is greater than a first preset SOC threshold when the charging pile charges the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging demand of the first battery group; if there is a second battery group in the battery pack whose SOC value is greater than the first preset SOC threshold, control the charging pile and the second battery group to charge the first battery group together.

[0098] In one possible implementation, the battery pack charging device 200 further includes: The first judgment module is configured to use the charging pile to charge the second battery group according to the charging demand of the second battery group in priority if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold during the process of the charging pile and the second battery group charging the first battery group together.

[0099] In one possible implementation, the battery pack charging device 200 further includes: a second judgment module configured to determine whether the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack if the SOC value of the second battery pack drops to less than or equal to a second preset SOC threshold during the process of the charging pile and the second battery pack jointly charging the first battery pack; The third judgment module is configured to charge both the first battery pack and the second battery pack using the maximum charging capacity of the charging pile if the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack.

[0100] In a possible implementation, the charging information further includes a charging rate of each of the battery packs, wherein the charging rate is positively correlated with the priority of the battery pack.

[0101] In a possible implementation, the charging information further includes the capacity of each of the battery packs, wherein the capacity is inversely correlated with the priority of the battery pack.

[0102] Regarding the battery pack charging device 200 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.

[0103] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon. When the program instructions are executed by a processor, the steps of the battery pack charging method provided by the present disclosure are implemented.

[0104] Figure 7 FIG6 is a block diagram illustrating a vehicle 600 according to an exemplary embodiment. For example, vehicle 600 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or another type of vehicle. Vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0105] Please refer to Figure 7 Vehicle 600 may include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. Vehicle 600 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of vehicle 600 may be interconnected via wired or wireless means.

[0106] In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, a navigation system, and the like.

[0107] The perception system 620 may include several sensors for sensing information about the environment surrounding the vehicle 600. For example, the perception system 620 may include a global positioning system (which may be a GPS system, a BeiDou system, or another positioning system), an inertial measurement unit (IMU), a laser radar, a millimeter-wave radar, an ultrasonic radar, and a camera.

[0108] The decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0109] The drive system 640 may include components that provide power to 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 an internal combustion engine, an electric motor, an air compression engine, or a combination thereof. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0110] 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. The processor 651 may execute instructions 653 stored in the memory 652.

[0111] The processor 651 can be any conventional processor, such as a commercially available CPU. The processor can also include a graphics processor (GPU), a field programmable gate array (FPGA), a system on chip (SOC), an application specific integrated circuit (ASIC), or a combination thereof.

[0112] The memory 652 may be implemented by any type of volatile or non-volatile 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.

[0113] In addition to instructions 653 , memory 652 may also store data, such as road maps, route information, and vehicle location, direction, speed, etc. The data stored in memory 652 may be used by computing platform 650 .

[0114] In the embodiment of the present disclosure, the processor 651 may execute the instruction 653 to complete all or part of the steps of the above-mentioned battery pack charging method.

[0115] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and has a code portion for executing the above-mentioned battery pack charging method when executed by the programmable device.

[0116] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this application can be implemented through electronic hardware, computer software, or a combination of both. Whether such functions are implemented through 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 described functions for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this application.

[0117] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X applies to A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies to A; X applies to B; or X applies to both A and B, then "X applies to A or B" satisfies any of the aforementioned instances. Furthermore, the articles "a" and "an," as used in this application and the appended claims, are generally understood to mean "one or more," unless otherwise specified or clear from the context to refer to the singular form.

[0118] 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 upon reading and understanding this specification and the accompanying drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. With particular regard to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. In addition, although particular 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 advantageous for any given or particular application. Furthermore, to the extent that the terms "include," "have," "have," "have," or variations thereof are used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "comprising."

[0119] 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 variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0120] 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 can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery pack charging method, characterized in that: The battery pack includes a plurality of battery groups, at least two of the plurality of battery groups have different electrical properties, and the plurality of battery groups can be connected in series or in parallel. The method includes: Obtaining charging information of the battery pack, wherein the charging information includes a charging requirement of each of the battery packs; When the battery pack is connected to the charging pile, each battery pack is charged according to priority based on the charging requirements of each battery pack and the charging capacity of the charging pile.

2. The battery pack charging method according to claim 1, wherein: The charging of each battery pack according to priority includes: When charging a battery pack of any priority, if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack, the battery pack is charged with the charging capacity that meets the charging demand; and The remaining charging capacity of the charging pile is used to charge the battery pack with the next priority level to the battery pack.

3. The battery pack charging method according to claim 1, wherein: The charging of the battery packs according to the priority level includes: After charging a battery pack of a priority level to a first preset battery state of charge (SOC) threshold, the battery pack of the next priority level is switched to be charged.

4. The battery pack charging method according to claim 1, wherein: The charging information further includes a charging rate of each of the battery packs, wherein the charging rate is positively correlated with the priority of the battery pack.

5. The battery pack charging method according to claim 4, characterized in that: The charging information further includes a capacity of each of the battery packs, wherein the capacity is inversely correlated with the priority of the battery pack.

6. The battery pack charging method according to claim 1, wherein: The charging of each battery pack according to a priority based on the charging requirements of each battery pack and the charging capacity of the charging pile includes: When the charging pile is charging a first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging demand of the first battery group, determining whether there is a battery group in the battery pack whose SOC value is greater than a first preset SOC threshold; If there is a second battery group in the battery pack whose SOC value is greater than the first preset SOC threshold, the charging pile and the second battery group are controlled to charge the first battery group together.

7. The battery pack charging method according to claim 6, characterized in that: The battery pack charging method further includes: During the process of the charging pile and the second battery pack jointly charging the first battery pack, if the SOC value of the second battery pack drops to less than or equal to a second preset SOC threshold, the charging pile is used to charge the second battery pack preferentially according to the charging demand of the second battery pack.

8. The battery pack charging method according to claim 6, wherein: The battery pack charging method further includes: During the process of the charging pile and the second battery pack jointly charging the first battery pack, if the SOC value of the second battery pack drops to less than or equal to a second preset SOC threshold, determining whether the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack; If the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack, both the first battery pack and the second battery pack are charged using the maximum charging capacity of the charging pile.

9. A battery pack charging device, characterized in that: The battery pack includes a plurality of battery groups, at least two of the plurality of battery groups have different electrical properties, and the plurality of battery groups can be connected in series or in parallel, including: an acquisition module configured to acquire charging information of the battery pack, wherein the charging information includes a charging requirement of each of the battery packs; The charging module is configured to charge each battery pack according to priority based on the charging requirements of each battery pack and the charging capacity of the charging pile when the battery pack is connected to the charging pile.

10. The battery pack charging device according to claim 9, characterized in that: The charging module includes: The first charging module is configured to charge a battery pack of any priority level with a charging capacity sufficient to meet the charging demand if the maximum charging capacity of the charging pile can meet the charging demand of the battery pack; and to use the remaining charging capacity of the charging pile to charge a battery pack of the next priority level to the battery pack.

11. The battery pack charging device according to claim 9, characterized in that: The charging module includes: The second charging module is configured to switch to charging a battery pack of the next priority level after charging the battery pack of the first priority level to a first preset battery state of charge (SOC) threshold.

12. The battery pack charging device according to claim 9, characterized in that: The charging module includes: The third charging module is configured to determine whether there is a battery group in the battery pack whose SOC value is greater than a first preset SOC threshold when the charging pile charges the first battery group in the battery pack, if the maximum charging capacity of the charging pile does not meet the charging demand of the first battery group; if there is a second battery group in the battery pack whose SOC value is greater than the first preset SOC threshold, control the charging pile and the second battery group to charge the first battery group together.

13. The battery pack charging device according to claim 12, wherein: Also includes: The first judgment module is configured to use the charging pile to charge the second battery group according to the charging demand of the second battery group in priority if the SOC value of the second battery group drops to less than or equal to a second preset SOC threshold during the process of the charging pile and the second battery group charging the first battery group together.

14. The battery pack charging device according to claim 12, wherein: Also includes: a second judgment module configured to determine whether a remaining charging time of the first battery group is less than a remaining charging time of the second battery group if an SOC value of the second battery group drops to less than or equal to a second preset SOC threshold value during a process in which the charging pile and the second battery group are jointly charging the first battery group; The third judgment module is configured to charge both the first battery pack and the second battery pack using the maximum charging capacity of the charging pile if the remaining charging time of the first battery pack is less than the remaining charging time of the second battery pack.

15. A vehicle, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to implement the steps of the method described in any one of claims 1 to 8 when executing the instruction.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

17. A computer program product, characterized in that The invention comprises a computer program, which implements the steps of the method according to any one of claims 1 to 8 when the computer program is executed by a processor.

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