Battery charging method, device and system and vehicle

Abstract

The invention provides a battery charging method, device and system and a vehicle, and relates to the technical field of battery charging. The method comprises the following steps: in a battery charging process, acquiring the voltage of an uncharged battery cluster and the voltage of a charged battery cluster in a battery; according to the fact that the difference between the voltage of the target uncharged battery cluster and the voltage of the charged battery cluster is smaller than or equal to a voltage difference threshold value, the total demand current of the battery is reduced, when the total demand current of the battery is reduced to be smaller than or equal to a preset current, the target uncharged battery cluster is added in the charged battery cluster, and a new charged battery cluster is obtained; and the new charged battery cluster is charged. According to the method, by adjusting the total demand current of the battery, the problem of local battery cluster over-current possibly occurring when the uncharged battery cluster is merged for charging is effectively avoided, the battery charging safety is improved, the overall service life of the battery is further prolonged, and the performance of the battery is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery charging, and in particular to a battery charging method, device, system and vehicle. BACKGROUND

[0002] With the growth of power demand and the improvement of emergency guarantee requirements, the demand for large-capacity and high-power mobile power supply vehicles is increasing. In order to meet such high-power output requirements, the power capacity of a single power conversion system (PCS) is often insufficient, and multiple PCSs need to be operated in parallel. In this architecture, the design of "one cluster management" is widely used, and its core structural feature is that each battery cluster can be independently managed and controlled, and the DC sides of multiple battery clusters are electrically connected in parallel.

[0003] In related technologies, when multiple battery clusters are charged by charging equipment (such as fixed charging piles or mobile energy supplement vehicles), due to the differences in voltage, internal resistance and other parameters of each battery cluster, inter-cluster circulating current may be caused. This circulating current can further cause overcurrent phenomenon in local battery clusters, thereby reducing the overall life and performance of the battery. SUMMARY

[0004] The present application provides a battery charging method, device, system and vehicle for preventing overcurrent phenomenon in local battery clusters, thereby improving the overall life and performance of the battery.

[0005] In a first aspect, the present application provides a battery charging method, which comprises:

[0006] During the battery charging process, the voltage of an uncharged battery cluster in the battery and the voltage of a charged battery cluster are obtained.

[0007] If the voltage difference between the target uncharged battery cluster and the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced.

[0008] When the total demand current of the battery is reduced to less than or equal to the preset current, the target uncharged battery cluster is added to the charged battery cluster to obtain a new charged battery cluster, and the new charged battery cluster is charged.

[0009] In a possible implementation, the adding of the target uncharged battery cluster to the charged battery cluster to obtain a new charged battery cluster, and the charging of the new charged battery cluster, comprises:

[0010] controlling a contactor connected to the target uncharged battery cluster to close, so that the target uncharged battery cluster is added into the charged battery cluster to obtain the new charged battery cluster;

[0011] adjusting a total demand current of the battery to a minimum of single cluster demand currents of the new charged battery cluster, and charging the new charged battery cluster.

[0012] In a possible implementation, the method further includes:

[0013] When any uncharged battery cluster is incorporated and starts charging, the total demand current of the battery is increased according to a preset time interval until a preset maximum demand current is reached.

[0014] In a possible implementation, before the voltage of the uncharged battery cluster and the voltage of the charged battery cluster in the battery are acquired during the battery charging process, the method further includes:

[0015] When the charging device accesses the battery, the battery cluster with the minimum voltage in the battery is charged;

[0016] The charged battery cluster includes the battery cluster with the minimum voltage in the battery.

[0017] In a possible implementation, the total demand current of the battery is reduced, including:

[0018] A current control instruction is sent to the charging device, so that the charging current output by the charging device is reduced to the preset current;

[0019] Based on the charging current output by the charging device, the total demand current of the battery is reduced to the preset current.

[0020] In a possible implementation, the method further includes:

[0021] During the battery charging process, if a fully charged battery cluster is detected, the total demand current of the battery is reduced;

[0022] When the total demand current of the battery is reduced to less than or equal to the preset current, a contactor connected to the fully charged battery cluster is controlled to be disconnected, and the charging of the fully charged battery cluster is stopped.

[0023] In a possible implementation, the method further includes:

[0024] After the charging of the fully charged battery cluster is stopped, a total demand current corresponding to the battery is calculated according to the single cluster demand current of the uncharged battery cluster;

[0025] According to a total demand current corresponding to the battery, the uncharged battery cluster continues to be charged.

[0026] In a second aspect, the present application provides an electronic device, comprising: a memory, a processor;

[0027] The memory stores computer-executable instructions.

[0028] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the first aspect and / or various possible implementation manners of the first aspect.

[0029] In a third aspect, the present application provides a battery charging system, comprising: an electronic device, a battery management system, a battery and a contactor;

[0030] The battery comprises a plurality of battery clusters, and each battery cluster is connected with a contactor;

[0031] The battery management system is configured to acquire key parameters of each battery cluster; the key parameters comprise at least one of voltage, current and power;

[0032] The electronic device is configured to execute the first aspect and / or various possible implementation manners of the first aspect.

[0033] In a fourth aspect, the present application provides a vehicle, comprising: a vehicle body; and the electronic device according to the second aspect, or the battery charging system according to the third aspect.

[0034] In a fifth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by a processor to implement the first aspect and / or various possible implementation manners of the first aspect.

[0035] In a sixth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the first aspect and / or various possible implementation manners of the first aspect.

[0036] The application provides a battery charging method, device, system and vehicle. The method comprises the following steps: obtaining the voltage of an uncharged battery cluster and the voltage of a charged battery cluster in a battery charging process; if the voltage difference between the target uncharged battery cluster and the charged battery cluster is less than or equal to the voltage difference threshold, reducing the total demand current of the battery, when the total demand current of the battery is reduced to be less than or equal to the preset current, adding the target uncharged battery cluster to the charged battery cluster to obtain a new charged battery cluster, and charging the new charged battery cluster. In the above process, when the voltage difference between the target uncharged battery cluster and the charged battery cluster is less than or equal to the voltage difference threshold, the target uncharged battery cluster is integrated and charged by reducing the total demand current of the battery, the overcurrent phenomenon of the local battery cluster is prevented, and the overall life and performance of the battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0038] Figure 1 The application scenario provided for the embodiments of the application is shown in the schematic diagram.

[0039] Figure 2 The flowchart of the battery charging method provided by the application is shown in the schematic diagram.

[0040] Figure 3 The flowchart of the battery charging method provided by the application is shown in the schematic diagram.

[0041] Figure 4 The hardware structure of the battery charging provided by the application is shown in the schematic diagram.

[0042] Figure 5 The flowchart of the battery cluster integration provided by the application is shown in the schematic diagram.

[0043] Figure 6 The process diagram of the battery cluster integration process provided by the application is shown in the schematic diagram.

[0044] Figure 7 The flowchart of the battery charging method provided by the application is shown in the schematic diagram.

[0045] Figure 8 The flowchart of the battery cluster integration provided by the application is shown in the schematic diagram.

[0046] Figure 9 The process diagram of the battery cluster integration process provided by the application is shown in the schematic diagram.

[0047] Figure 10A structural schematic diagram of an electronic device provided for an embodiment of the present application is shown in the following figure.

[0048] Figure 11 A structural schematic diagram of a battery charging system provided for an embodiment of the present application is shown in the following figure.

[0049] The specific embodiments of the present application have been shown in the above figures, and will be described in more detail hereinafter. These figures and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0051] In modern power systems, with the continuous growth of power demand and the increasing requirements for emergency power support, large-capacity and high-power mobile power supply vehicles have become an important solution. These mobile power supply vehicles can provide reliable power support in emergency situations and meet the high-power output requirements in different scenarios. However, the power capacity of a single energy storage converter (PCS) is usually difficult to meet these requirements, so the use of multiple PCSs in parallel operation mode has become a common architectural choice.

[0052] In this multi-PCS parallel architecture, the design concept of "one cluster management" is widely used. The core of this design is to independently manage each battery cluster and collect and monitor key parameters such as voltage, current, temperature, etc. for each battery cluster. Ensure that the operating state of each battery cluster is within the optimal range, thereby improving the performance and safety of the entire battery system.

[0053] In addition, the DC side of multiple battery clusters is electrically connected in parallel. This design not only simplifies the electrical connection of the system, but also enables efficient integration and utilization of power resources. In this way, the system can dynamically adjust the output of each battery cluster according to the actual load demand, optimizing the overall power distribution.

[0054] In the related art, when fast charging is implemented through an external charging device, the inherent parameter differences (voltage, internal resistance, etc.) between the parallel battery clusters can generate circulating currents between the battery clusters, which form a vector superposition with the forward charging current flowing from the charging device to the battery, and can cause the total charging current of the local battery cluster to be too large, exceeding the normal charging current range, thereby causing overcharging and reducing the overall life and performance of the battery.

[0055] To solve the above problems, the inventors consider that the total demand current of the battery can be reduced when the uncharged battery cluster is charged, thereby avoiding overcharging of the local battery cluster. Accordingly, the inventors have found through repeated experiments that the voltage of the uncharged battery cluster and the voltage of the charged battery cluster can be obtained during the charging of the battery. If the difference between the voltage of the target uncharged battery cluster and the voltage of the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced, and when the total demand current of the battery is reduced to be less than or equal to the preset current, the target uncharged battery cluster is charged, thereby solving the problem of overcharging of the local battery cluster that can occur when the uncharged battery cluster is charged. Based on this, the present application proposes a battery charging method, which aims to dynamically adjust the total demand current of the battery to ensure the safety and efficiency of the charging process and improve the overall life and performance of the battery.

[0056] Figure 1 The application scenario provided by the embodiment of the present application is shown in the following Figure 1 , which includes a charging device, a contactor, and a battery. The contactor can include contactor 1 and contactor 2, and the battery can include battery cluster 1 and battery cluster 2.

[0057] After the contactor 1 is closed, the charging device can charge the battery cluster 1. On the basis of the contactor 1 being closed, the contactor 2 is closed, and the charging device can simultaneously charge the battery cluster 1 and the battery cluster 2.

[0058] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail in the following specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0059] Figure 2 The flowchart of the battery charging method provided by the embodiment one of the present application is shown in the following Figure 2 , which can include:

[0060] S201, during the charging of the battery, the voltage of the uncharged battery cluster in the battery and the voltage of the charged battery cluster are obtained.

[0061] The execution subject of the embodiment of the present application can be an electronic device, and the electronic device is provided with an energy management system (EMS).

[0062] In this step, the electronic device can acquire, through a battery management system (BMS), the voltage of each uncharged battery cluster and the voltage of each charged battery cluster in the charging process of the battery. The BMS can monitor and manage the key parameters of each battery cluster in the battery, and the key parameters can include at least one of voltage, current, and power.

[0063] For example, the battery 1 includes a battery cluster 1 and a battery cluster 2, and the electronic device can acquire, through the BMS, that the voltage of the battery cluster 1 is U1 and the voltage of the battery cluster 2 is U2. The battery cluster 1 is a charged battery cluster, and the battery cluster 2 is an uncharged battery cluster.

[0064] S202, if the voltage difference between the target uncharged battery cluster and the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced.

[0065] In this step, the total demand current of the battery can be reduced according to the voltage difference between the target uncharged battery cluster and the charged battery cluster being less than or equal to the voltage difference threshold. The target uncharged battery cluster refers to an uncharged battery cluster whose voltage difference from the charged battery cluster is less than or equal to the voltage difference threshold.

[0066] In an optional implementation, reducing the total demand current of the battery can include sending a current control instruction to the charging device. After receiving the current control instruction, the charging device can control the output charging current according to the current control instruction, and then the total demand current of the battery (i.e., the size of the charging current input to the battery) can be reduced based on the output charging current of the charging device.

[0067] Optionally, the voltage difference threshold can be preset according to the specific application scenario and use requirement of the battery. For example, the voltage difference threshold can be set to 5 volts (V).

[0068] For example, according to the voltage difference between the voltage U2 of the target uncharged battery cluster (battery cluster 2) and the voltage U1 of the charged battery cluster (battery cluster 1) being less than the voltage difference threshold 5V, a current control instruction can be sent to the charging device to reduce the total demand current of the battery 1.

[0069] S203, when the total demand current of the battery is reduced to be less than or equal to a preset current, a target uncharged battery cluster is added in the charged battery cluster to obtain a new charged battery cluster, and the new charged battery cluster is charged.

[0070] In this step, the electronic device can detect the charging current output by the charging device through the current sensor, and when detecting that the total demand current of the battery (the charging current output by the charging device) is reduced to be less than or equal to the preset current, a target uncharged battery cluster is added in the charged battery cluster to obtain a new charged battery cluster, and the new battery cluster is charged.

[0071] Similarly, the preset current can be preset according to specific application requirements and use requirements. For example, the preset current can be 1A. It should be understood that the smaller the preset current is set, the smaller the vector superposition of the inter-cluster circulating current and the forward charging current from the charging device to the battery will be, and the risk of overcharging of the local battery cluster can be reduced to a greater extent.

[0072] For example, the electronic device can detect the charging current output by the charging device through the current sensor, and when detecting that the charging current output by the charging device is 1A, a target uncharged battery cluster (battery cluster 2) is added in the charged battery cluster (battery cluster 1) to obtain a new charged battery cluster, and the new battery cluster is charged. The new charged battery cluster can be regarded as a battery cluster set, including the parallel connection of the battery cluster 1 and the battery cluster 2.

[0073] In the embodiments of the present application, the voltage of the uncharged battery cluster and the voltage of the charged battery cluster in the battery can be obtained during the battery charging process. If the difference between the voltage of the target uncharged battery cluster and the voltage of the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced, and then when the total demand current of the battery is reduced to be less than or equal to the preset current, the target uncharged battery cluster is added in the charged battery cluster to obtain a new charged battery cluster, and the new charged battery cluster is charged. In the above process, the total demand current of the battery can be adjusted on the basis that the difference between the voltage of the target uncharged battery cluster and the voltage of the charged battery cluster meets the voltage difference threshold, the target uncharged battery cluster is incorporated and charged, thereby solving the overcurrent problem that may occur in the local battery cluster and improving the overall life and performance of the battery.

[0074] In Figure 2 On the basis of the embodiments shown in the above, the following will be described in combination with Figure 3 The above battery charging method will be further described in detail.

[0075] Figure 3 The flowchart of the second embodiment of the battery charging method provided by the present application is shown in FIG. 2. Please refer to FIG. 2. Figure 3 The method can include:

[0076] S301, when detecting that the charging device accesses the battery, charging the battery cluster with the smallest voltage in the battery.

[0077] In this step, when detecting that the charging device accesses the battery, the electronic device can control the contactor connected to the battery cluster with the minimum voltage in the battery to close, and charge the battery cluster with the minimum voltage in the battery.

[0078] Figure 4 A hardware structure schematic diagram of battery charging provided for an embodiment of the present application. Please refer to Figure 4 The battery can include battery cluster 1, …, battery cluster N, each of which can be connected with a PCS at the alternating current side, and the N battery clusters are connected in parallel to the charging seat at the direct current (DC) side and connected in parallel to the alternating current (AC) bus at the alternating current (AC) side. In the parallel charging circuit at the direct current side, each contactor is responsible for controlling the on-off of a battery cluster charging circuit.

[0079] Specifically, the contactor K1 can control the on-off of the battery cluster 1 charging circuit, and the contactor KN can control the on-off of the battery cluster N charging circuit.

[0080] Specifically, the charging device can provide power to each parallel battery cluster through the charging seat to provide charging current for multiple battery clusters.

[0081] For example, the battery 2 includes battery cluster 1, battery cluster 2, and battery cluster 3. When detecting that the charging gun of the fixed charging pile is inserted into the charging seat, the contactor connected to the battery cluster with the minimum voltage in the battery 2 (battery cluster 1) can be controlled to close, and the battery cluster with the minimum voltage (battery cluster 1) is charged.

[0082] S302, determine that the charged battery cluster includes the battery cluster with the minimum voltage in the battery.

[0083] For example, it can be determined that the charged battery cluster includes the battery cluster with the minimum voltage in the battery 2 (battery cluster 1).

[0084] S303, during the battery charging process, the voltage of the uncharged battery cluster in the battery and the voltage of the charged battery cluster are obtained.

[0085] For example, during the battery charging process, the electronic device can obtain the voltage of the battery cluster 1 as U1, the voltage of the battery cluster 2 as U2, and the voltage of the battery cluster 3 as U3 through the BMS. Among them, the battery cluster 1 is a charged battery cluster, and the battery cluster 2 and the battery cluster 3 are uncharged battery clusters. For example, the value of U1 is 500V, the value of U2 is 504V, and the value of U3 is 510V.

[0086] S304, if the difference between the voltage of the target uncharged battery cluster and the voltage of the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced.

[0087] Specifically, the reducing the total demand current of the battery can include: sending a current control instruction to the charging device, so that the charging current output by the charging device is reduced to a preset current; and reducing the total demand current of the battery to the preset current based on the charging current output by the charging device.

[0088] For example, when the voltage difference threshold is 5V, the current control instruction can be sent to the fixed charging pile to reduce the charging current output by the fixed charging pile to a preset current 1A, according to the fact that the voltage difference between the voltage U2 of the target uncharged battery cluster (battery cluster 2) and the voltage of the charged battery cluster (battery cluster 1) is less than the voltage difference threshold 5V; and the total demand current of the battery is reduced to the preset current 1A based on the charging current output by the fixed charging pile.

[0089] S305, when the total demand current of the battery is reduced to less than or equal to a preset current, the contactor connected to the target uncharged battery cluster is controlled to be closed, so that the target uncharged battery cluster is added to the charged battery cluster to obtain a new charged battery cluster.

[0090] For example, when the total demand current of the battery is reduced to a preset current 1A, the contactor connected to the target uncharged battery cluster (battery cluster 2) can be controlled to be closed, so that the target uncharged battery cluster is added to the charged battery cluster (battery cluster 1) to obtain a new charged battery cluster including the battery cluster 1 and the battery cluster 2.

[0091] S306, the total demand current of the battery is adjusted to the minimum value of the single-cluster demand current of the new charged battery cluster, and the new charged battery cluster is charged.

[0092] In this step, the single-cluster demand current of each charged battery cluster can be obtained, the minimum value of the single-cluster demand current of the charged battery cluster is selected as the total demand current of the battery, and the new charged battery cluster is charged.

[0093] In an optional embodiment, the battery cluster can be endowed with specific fixed electrical characteristic parameters in the manufacturer design and production stage. These parameters include rated voltage, nominal capacity, and key safety limit value: single-cluster maximum allowed charging current (single-cluster demand current). This current value is a fixed upper limit preset according to the design specifications, chemical properties and safety margin of the battery cluster, and represents the maximum charging current that the battery cluster can safely withstand throughout its life cycle.

[0094] In another optional embodiment, the BMS for monitoring and managing the battery can monitor and manage the state of the battery cluster in real time, and the electronic device can calculate a suitable charging current according to the current state (such as voltage, current and capacity) of the battery cluster obtained from the BMS.

[0095] Specifically, after determining the total demand current of the battery, a current control instruction can be sent to the charging device, and the charging device can control the output charging current to reach the total demand current of the battery according to the current control instruction.

[0096] For example, in a new charged battery cluster, the demand current of battery cluster 1 is A1, and the demand current of battery cluster 2 is A2. If the demand current A1 is less than the demand current A2, the demand current A1 of battery cluster 1 can be selected as the total demand current of the battery, and the new charged battery cluster including battery cluster 1 and battery cluster 2 is charged.

[0097] In the embodiments of the present application, when it is detected that the charging device is connected to the battery, the battery cluster with the minimum voltage in the battery can be charged first. Then, during the charging process, the voltage of the uncharged battery cluster and the voltage of the charged battery cluster in the battery can be obtained. When the voltage difference between the target uncharged battery cluster and the charged battery cluster is less than or equal to the voltage difference threshold, the total demand current of the battery is reduced to be less than or equal to the preset current. Then, the contactor connected to the target uncharged battery cluster is controlled to be closed, so that the target uncharged battery cluster is added to the charged battery cluster to form a new charged battery cluster. Then, the total demand current of the battery is adjusted to be the minimum value of the demand current of each battery cluster in the new charged battery cluster, and the new charged battery cluster is continuously charged. In the above process, by setting the voltage difference threshold and reducing the total demand current of the battery, overcharging or uneven charging can be effectively prevented, thereby prolonging the service life of the battery and improving the reliability of the battery charging.

[0098] In a possible design, based on any of the above embodiments, the battery charging method can further include: when any uncharged battery cluster is integrated and starts to be charged, the total demand current of the battery is increased according to a preset time interval until a preset maximum demand current is reached.

[0099] Specifically, the increasing process can include the following steps ①, ② and ③.

[0100] Step ①: Calculate the difference between the maximum allowable current and the current actual current of each charged battery cluster to determine the additional current that can be tolerated by each charged battery cluster in the current state.

[0101] Step ②: Select the minimum value from all the calculated differences as the basis for the current increment, to ensure that all battery clusters can safely tolerate the increased current.

[0102] Step ③: Gradually increase the current according to the preset time interval. At the end of each time interval, the selected minimum value is added to the current total demand current as the current increment.

[0103] Optionally, the time interval can be preset according to actual needs. For example, the time interval can be preset to 5 seconds (s).

[0104] In the above implementation manner, when any uncharged battery cluster is incorporated and starts charging, the total demand current of the battery is increased according to the preset time interval until the preset maximum demand current is reached. By this method, smooth transition of the charging process can be realized, and the impact of current mutation on the battery is avoided. This step-by-step increasing manner ensures that the increase of the charging current is controllable and safe, helps to prolong the service life of the battery, improve the charging efficiency, and reduce the risk of overcharging or unbalanced charging.

[0105] Figure 5 A battery cluster parallel operation flow is provided for the embodiments of the present application. Please refer to Figure 5 The battery cluster parallel operation flow can include:

[0106] S501, starting direct current power compensation.

[0107] For example, the electronic device can start direct current power compensation for the battery 2 when detecting that the charging device is connected to the charging seat.

[0108] S502, charging the battery cluster with the minimum voltage in the battery.

[0109] Optionally, the electronic device can determine the battery cluster with the minimum voltage by comparing the voltage of each battery cluster in the battery 2, and charge it.

[0110] S503, determining whether the voltage of the uncharged battery cluster in the battery is less than or equal to the voltage of the charged battery cluster by a preset threshold value.

[0111] Specifically, if it exists, step S504 can be performed, and if it does not exist, the voltage of the uncharged battery cluster in the battery and the charged battery cluster can be continuously monitored, and step S503 can be repeated.

[0112] It should be noted that if the voltage of the uncharged battery cluster is less than or equal to the voltage of the charged battery cluster by a preset threshold value, the uncharged battery cluster is the target uncharged battery cluster.

[0113] S504, starting the battery cluster parallel operation flow.

[0114] For example, the parallel operation flow of the battery cluster 1 and the battery cluster 2 can be started according to the difference between the voltage of the target uncharged battery cluster (the battery cluster 2) and the voltage of the charged battery cluster (the battery cluster 1) being less than the voltage difference threshold value.

[0115] S505, determining whether all battery clusters in the battery are completed parallel operation.

[0116] Specifically, if the completion, end the parallel connection of the battery cluster, if not, return to perform step S503.

[0117] For example, the battery 2 includes the battery cluster 1, the battery cluster 2, and the battery cluster 3, if the three battery clusters have all been parallel connection charging, end the parallel connection of the battery cluster, if there is a battery cluster not parallel connection, continue to determine whether there is a voltage of the uncharged battery cluster less than or equal to the voltage of the charged battery cluster in the battery 1, until the parallel connection charging of all battery clusters is completed.

[0118] The battery cluster parallel connection charging process provided by the embodiment of the application can, when starting the direct current energy supplement, preferentially charge the battery cluster with the lowest voltage by comparing the voltages of the battery clusters; then, determine whether there is a voltage of the uncharged battery cluster less than or equal to a voltage of the charged battery cluster, if there is, start the parallel connection process, and parallel connection charge the battery cluster with a smaller voltage difference; finally, determine whether all battery clusters complete the parallel connection, if not, continue to monitor and process until all battery clusters complete the parallel connection charging. In the above process, the voltage difference can be used as a basis for starting the battery cluster parallel connection process, to ensure the voltage balance among the battery clusters and prevent overcharging caused by the voltage imbalance.

[0119] Figure 6 The process schematic diagram of starting the battery cluster parallel connection process provided by the embodiment of the application is shown in FIG. 1. Figure 6 The starting battery cluster parallel connection process can include:

[0120] S601, reduce the total demand current of the battery to a preset current.

[0121] For example, the total demand current of the battery 2 can be reduced to a preset current 1A.

[0122] S602, close the direct current contactor.

[0123] For example, the direct current contactor connected to the target uncharged battery cluster (the battery cluster 2) can be controlled to be closed according to the voltage difference between the voltage of the target uncharged battery cluster (the battery cluster 2) and the voltage of the charged battery cluster (the battery cluster 1) being less than the voltage difference threshold.

[0124] S603, adjust the total demand current of the battery to the minimum value of the single cluster demand current of the new charged battery cluster.

[0125] S604, every interval time t, determine whether the total demand current of the battery reaches the preset maximum demand current.

[0126] If yes, end the parallel connection, if not, perform step S605.

[0127] S605, selecting a minimum incremental current in the new charged battery cluster to increment the total demand current of the battery.

[0128] Specifically, the difference between the maximum allowable current and the current actual current of each charged battery cluster can be calculated, and then the minimum value is selected from all the calculated differences to determine the minimum incremental current that can be safely increased in the new charged battery cluster, and the total demand current of the battery is incremented.

[0129] The starting battery parallel process provided by the embodiments of the present application can reduce the total demand current of the battery to the preset current, close the DC contactor, restore the total demand current of the battery to the minimum value of the demand current of a single cluster in the new charged battery cluster, and increment the total demand current of the battery according to the preset time interval until the preset maximum demand current is reached. By gradually increasing the total demand current of the battery, the impact of sudden current increase on the battery can be effectively avoided, and the service life of the battery is protected.

[0130] The contents shown in the above embodiments are all the processes of battery cluster parallel, and the following will be described in combination with Figure 7 , the process of cutting off the battery cluster is described.

[0131] Figure 7 The flowchart of the third embodiment of the battery charging method provided by the present application is shown. Please refer to Figure 7 On the basis of any of the above embodiments, the battery charging method can further include:

[0132] S701, during the battery charging process, if a fully charged battery cluster is detected, the total demand current of the battery is reduced.

[0133] In this step, during the process of completing the parallel charging of all battery clusters, the power of each battery cluster can be detected, and if a fully charged battery cluster is detected, the total demand current of the battery can be reduced.

[0134] For example, the battery 2 includes the battery cluster 1, the battery cluster 2, and the battery cluster 3. During the process of completing the parallel charging of the three battery clusters, the power of each battery cluster can be detected, and when the battery cluster 3 is detected to be fully charged, the total demand current of the battery 2 can be reduced.

[0135] S702, when the total demand current of the battery is reduced to less than or equal to the preset current, the contactor connected to the fully charged battery cluster is controlled to be disconnected, and the charging of the fully charged battery cluster is stopped.

[0136] In this step, the electronic device can detect the charging current output by the charging device through the current sensor, and when detecting that the total demand current of the battery (the charging current output by the charging device) is reduced to less than or equal to the preset current, control the contactor connected to the fully charged battery cluster to be disconnected, and stop charging the fully charged battery cluster.

[0137] For example, the electronic device can control the contactor connected to the battery cluster 3 to be disconnected and stop charging the battery cluster 3 when detecting that the charging current output by the charging device is 1A through the current sensor.

[0138] The battery charging method provided by the embodiments of the present application can detect the state of charge of each battery cluster, reduce the total demand current of the battery in time when there is a fully charged battery cluster, control the contactor to be disconnected, and stop charging the fully charged battery cluster, thereby avoiding overcharging. In addition, through reasonable current management, the current change when the contactor is disconnected can be ensured to not cause impact on the contactor, thereby reducing the risk of damage to the contactor.

[0139] In a possible design, based on the above-mentioned embodiment three, the battery charging method can further include: after stopping charging the fully charged battery cluster, calculating the total demand current of the battery according to the single-cluster demand current of the non-fully charged battery cluster, and continuing to charge the non-fully charged battery cluster according to the total demand current of the battery.

[0140] For example, after stopping charging the battery cluster 3, the demand of the non-fully charged battery cluster 1 and the battery cluster 2 can be re-evaluated. Assuming that the battery cluster 1 and the battery cluster 2 are not fully charged, the total demand current of the battery can be calculated according to the single-cluster demand current of the battery cluster 1 and the single-cluster demand current of the battery cluster 2. Based on the calculation result, the charging current of the charging device is adjusted to meet the charging demand of the non-fully charged battery cluster. For example, the single-cluster demand current of the battery cluster 1 and the battery cluster 2 is 100A, and the total demand current of the battery can be 200A. The charging device can adjust the charging current to 200A to ensure that the non-fully charged battery cluster 1 and the battery cluster 2 are provided with sufficient current for charging.

[0141] In the above implementation manner, when detecting that the battery cluster is fully charged and stopping charging the battery cluster, the total demand current of the battery can be determined according to the single-cluster demand current of the non-fully charged battery cluster, and the charging current is adjusted to ensure that the non-fully charged battery cluster obtains the required current, thereby improving the charging efficiency.

[0142] Figure 8 A flowchart of the battery cluster cutting-off provided by the embodiments of the present application is provided. Please refer to Figure 8 The battery cluster cutting-off flowchart can include:

[0143] S801, in the direct current energy supplement stage.

[0144] S802, detecting whether there is a battery cluster that has been fully charged.

[0145] Specifically, if a battery cluster that has been fully charged is detected, step S803 can be performed, and if no battery cluster that has been fully charged is detected, charging of the battery clusters that have not been fully charged can continue.

[0146] S803, starting a battery cluster removal process.

[0147] For example, the battery 2 includes battery cluster 1, battery cluster 2, and battery cluster 3. During charging of the three battery clusters in parallel, if it is detected that battery cluster 3 has been fully charged, the battery cluster removal process can be started, the contactor connected to battery cluster 3 is controlled to be disconnected, and charging of battery cluster 3 is stopped.

[0148] S804, determining whether all battery clusters in the battery have stopped charging.

[0149] Specifically, if all battery clusters have stopped charging, it means that the power of all battery clusters in the battery has been fully charged. If there is a battery cluster that continues to charge, step S802 can be returned to.

[0150] In the embodiments of the present application, the charging state of each battery cluster can be detected in the direct current energy supplement stage of the battery. When it is detected that there is a battery cluster that has reached a full charge state, the battery cluster removal process can be started, and the contactor is controlled to be disconnected to stop further charging of the battery cluster, thereby avoiding overcharging and protecting the life and performance of the battery.

[0151] Figure 9 A process diagram for starting the battery cluster removal process provided in the embodiments of the present application is provided. Referring to FIG. 8, starting the battery cluster removal process can include: Figure 9

[0152] S901, reducing the total demand current of the battery to a preset current.

[0153] S902, the direct current contactor is disconnected.

[0154] S903, calculating and restoring the total demand current of the battery.

[0155] Specifically, after stopping charging of the battery cluster that has been fully charged, the total demand current of the battery can be calculated according to the single-cluster demand current of the battery cluster that has not been fully charged. Based on the calculation result, the charging current of the charging device is adjusted, and charging of the battery cluster that has not been fully charged continues.

[0156] ​The battery cluster removal process provided by the embodiments of the present application can reduce the total demand current of the battery to the preset current, disconnect the DC contactor, calculate and restore the total demand current of the battery, and continue to charge the battery cluster that is not fully charged. In the above process, the charging state of the battery cluster can be effectively managed by precisely controlling the distribution of the current. Not only can the overcharging of the battery cluster that is fully charged be avoided, but also the battery cluster that is not fully charged can continue to obtain the required current for charging.

[0157] Figure 10 The structural schematic diagram of the electronic device provided by the embodiments of the present application is provided. Please refer to Figure 10 The electronic device 10 provided by the embodiments of the present application is provided with an energy management system (EMS), which includes at least one processor 11 and a memory 12. Optionally, the electronic device 10 further includes a communication component 13. The processor 11, the memory 12 and the communication component 13 are connected through a bus 14.

[0158] In the specific implementation process, the at least one processor 11 executes the computer execution instructions stored in the memory 12, so that the at least one processor 11 executes the above-mentioned method.

[0159] The specific implementation process of the processor 11 can refer to the above-mentioned method embodiments, which have similar implementation principles and technical effects, and will not be described here again.

[0160] In the above-mentioned embodiments, it should be understood that the processor can be a central processing unit (English: Central Processing Unit, for short: CPU), and can also be other general-purpose processors, digital signal processors (English: Digital Signal Processor, for short: DSP), application specific integrated circuits (English: Application Specific Integrated Circuit, for short: ASIC) and the like. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor, etc. The steps of the method disclosed in the application can be directly embodied as the execution of the hardware processor, or executed by the combination of the hardware and software modules in the processor.

[0161] The memory can contain a high-speed memory (Random Access Memory, RAM), and can also include a non-volatile memory (Non-volatile Memory, NVM), for example, at least one disk memory.

[0162] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0163] Figure 11 A structural schematic diagram of a battery charging system provided by an embodiment of the present application is provided. Referring to FIG. 2, Figure 11 The battery charging system 20 includes an electronic device 21, a battery management system 22, a battery 23, and a contactor 24.

[0164] The battery 23 includes a plurality of battery clusters, and each battery cluster is connected with one contactor 24.

[0165] The battery management system 22 is configured to acquire key parameters of each battery cluster, and the key parameters include at least one of voltage, current, and power.

[0166] The electronic device 21 is configured to perform the battery charging method as shown in the above method embodiments.

[0167] It should be noted that the working process of the battery charging system 20 can refer to the process shown in the above method embodiments, and the implementation principle and beneficial effects are similar, which will not be described here.

[0168] The present application also provides a vehicle, including a vehicle body, and Figure 10 the electronic device shown, or Figure 11 the battery charging system shown, to implement the battery charging method in the above embodiments.

[0169] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the above method.

[0170] The present application also provides a computer-readable storage medium, which stores computer execution instructions, and when a processor executes the computer execution instructions, the above method is implemented.

[0171] The above-mentioned readable storage medium can be realized by any type of volatile or nonvolatile storage devices or their combinations, 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 storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0172] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0173] The division of units is only a logical functional division, and in actual implementation, there can be another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0174] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0175] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0176] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0177] It can be understood by those skilled in the art that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0178] Finally, it should be noted that: those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A battery charging method, characterized in that, The method includes: During battery charging, the voltages of uncharged battery clusters and charged battery clusters are acquired. If the voltage difference between the target uncharged battery cluster and the voltage of the charged battery cluster is less than or equal to a voltage difference threshold, then the total current demand of the battery is reduced. When the total current demand of the battery decreases to less than or equal to the preset current, the target uncharged battery cluster is added to the charged battery cluster to obtain a new charged battery cluster, and the new charged battery cluster is charged.

2. The method according to claim 1, characterized in that, The step of adding the target uncharged battery cluster to the already charged battery cluster to obtain a new charged battery cluster, and then charging the new charged battery cluster, includes: The contactor connected to the target uncharged battery cluster is closed to add the target uncharged battery cluster to the charged battery cluster, thus obtaining the new charged battery cluster; The total current demand of the battery is adjusted to the minimum current demand of a single cluster in the new charged battery cluster, and the new charged battery cluster is charged.

3. The method according to claim 1 or 2, characterized in that, The method further includes: When any uncharged battery cluster is added and begins charging, the total current demand of the battery is increased according to a preset time interval until the preset maximum current demand is reached.

4. The method according to claim 1 or 2, characterized in that, Before acquiring the voltages of the uncharged battery clusters and the charged battery clusters during battery charging, the method further includes: When a charging device is detected to be connected to the battery, the battery cluster with the lowest voltage in the battery is charged. The charged battery cluster is determined to include the battery cluster with the lowest voltage among the batteries.

5. The method according to claim 4, characterized in that, The reduction of the total current demand of the battery includes: Send a current control command to the charging device to reduce the charging current output by the charging device to the preset current; Based on the charging current output by the charging device, the total current demand of the battery is reduced to the preset current.

6. The method according to claim 1 or 2, characterized in that, The method further includes: During battery charging, if a fully charged battery cluster is detected, the total current demand of the battery is reduced. When the total current demand of the battery decreases to less than or equal to the preset current, the contactor connected to the fully charged battery cluster is disconnected, stopping the charging of the fully charged battery cluster.

7. The method according to claim 6, characterized in that, The method further includes: After stopping the charging of the fully charged battery clusters, the total current demand of the batteries is calculated based on the single cluster current demand of the partially charged battery clusters. Based on the total current demand corresponding to the battery, the partially charged battery clusters continue to be charged.

8. An electronic device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-7.

9. A battery charging system, characterized in that, include: Electronic devices, battery management systems, batteries, and contactors; The battery includes multiple battery clusters, and each battery cluster is connected to a contactor. The battery management system is used to acquire key parameters for each battery cluster; the key parameters include at least one of voltage, current, and charge. The electronic device is used to perform the battery charging method as described in any one of claims 1 to 7.

10. A vehicle, characterized in that, include: Vehicle body; And, the electronic device as claimed in claim 8, or the battery charging system as claimed in claim 9.

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