Charging control method, system, vehicle, and program product

Abstract

The invention provides a charging control method and system, a vehicle, a storage medium and a program product. The method comprises the steps that the working voltage of a battery module in a battery system and the connection state of a starting battery and the battery module in the battery system are obtained; determining a target voltage and a current voltage of the battery module according to the working voltage and the connection state; and charging the starting battery according to the target voltage and the current voltage. The condition of replacing the battery module connected with the starting battery is set based on the current voltage and the working voltage, so that the battery module corresponding to the target voltage (such as the maximum working voltage) meeting the requirement is always used for charging the starting battery, a battery active equalization mode is adopted, the risk of over-charging and over-discharging is reduced, and the service life of the starting battery is prolonged. The performance and the service life of the power battery are improved, and the complexity, the manufacturing cost, the maintenance cost, the after-sales cost and the like of a battery system are reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a charging control method for a battery system, a battery system, a vehicle, and a computer program product. Background Art

[0002] Ensuring the power level of the starting battery is very important for the battery system. In related technologies, a high-low voltage conversion module DC / DC is installed to convert the high voltage of the power battery into power for the low-voltage loads on the vehicle after a series of voltage reduction, rectification, and filtering, while charging the starting battery at the same time.

[0003] However, using the above method to charge the starting battery has the problem that the battery system is relatively complex, and the manufacturing, maintenance and after-sales costs are high. There is also the problem of balancing the high-voltage battery, which increases the risk of overcharging and over-discharging, reducing the performance and life of the power battery. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, one object of the present invention is to propose a charging control method for a battery system, which reduces the complexity, manufacturing, maintenance and after-sales costs of the battery system, and uses active battery balancing to reduce the risks of overcharging and over-discharging, thereby improving the performance and life of the power battery.

[0006] To this end, a second object of the present invention is to provide a battery system.

[0007] To this end, a third object of the present invention is to provide a vehicle.

[0008] To this end, a fourth object of the present invention is to provide a computer program product.

[0009] In order to achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a charging control method for a battery system, the method comprising: obtaining the operating voltage of a battery module in the battery system and the connection status between a starting battery and a battery module in the battery system; determining a target voltage and a current voltage of the battery module based on the operating voltage and the connection status; and charging the starting battery based on the target voltage and the current voltage.

[0010] According to the charging control method of the battery system of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with the battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0011] In some embodiments, the target voltage and current voltage of the battery module are determined based on the operating voltage and the connection state, including: obtaining the target voltage when the operating voltage meets a first preset condition; and obtaining the current voltage when the connection state is connected.

[0012] In some embodiments, charging the starting battery according to the target voltage and the current voltage includes: when the vehicle is in a first operating mode, determining a voltage difference according to the target voltage and the current voltage; when the voltage difference meets a first preset voltage threshold, controlling the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery.

[0013] In some embodiments, charging the starting battery according to the target voltage and the current voltage includes: when the vehicle is in the second operating mode and the target voltage and the current voltage meet a second preset condition, controlling the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery.

[0014] In some embodiments, controlling the corresponding switch of the battery module to be turned on or off includes: controlling the corresponding switch of the battery module at the current voltage to be turned off; and controlling the corresponding switch of the battery module at the target voltage to be turned on after a first preset time.

[0015] In some embodiments, obtaining the operating voltage of a battery module in a battery system includes: controlling a switch in the battery system to maintain a first state; obtaining the operating voltage of the battery module according to a third preset condition in a first operating mode; and obtaining the operating voltage of the battery module according to a fourth preset condition in a second operating mode.

[0016] To achieve the above-mentioned objectives, an embodiment of the second aspect of the present invention proposes a battery system, comprising: an acquisition module for acquiring the operating voltage of a battery module in the battery system; a battery management system connected to the acquisition module, for acquiring the connection status between a starting battery and a battery module in the battery system, determining a target voltage and a current voltage of the battery module based on the operating voltage and the connection status, and charging the starting battery in the battery system based on the target voltage and the current voltage.

[0017] In some embodiments, the battery system further includes: a fuse module, one end of which is connected to the positive pole of the starting battery for protecting the circuit where the starting battery is located; a battery module, the positive pole of the battery module is connected to the other end of the fuse module for providing a charging voltage; two switches corresponding to each battery module, the on-lines of the two switches are respectively connected to the two ends of the battery module, the off-lines of the two switches are respectively connected to the positive and negative poles of the starting battery, and the control lines of the two switches are connected to the I / O port of the battery management system.

[0018] According to the battery system of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery modules in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery modules. Based on the current voltage and the operating voltage, the conditions for replacing the battery modules connected to the starting battery are set, so that the starting battery is always charged with a battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0019] In order to achieve the above-mentioned object, an embodiment of a third aspect of the present invention provides a vehicle, comprising: a battery system as required in the above-mentioned embodiment.

[0020] According to an embodiment of the present invention, a battery system is used on the vehicle. The target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with a battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method, which reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system. In order to achieve the above-mentioned object, an embodiment of the fourth aspect of the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the charging control method of the battery system described in the above-mentioned embodiment.

[0021] According to the computer program product of an embodiment of the present invention, a target voltage is determined by obtaining the operating voltage of a battery module in a battery system, and the current voltage is determined by obtaining the connection status between the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with a battery module corresponding to a target voltage (e.g., a maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a block diagram of a battery system according to one embodiment of the present invention; Figure 2 is a functional block diagram of a battery system according to an embodiment of the present invention; Figure 3 is a flow chart of a charging control method for a battery system according to one embodiment of the present invention; Figure 4 is a flow chart of a charging control method for a battery system according to another embodiment of the present invention; Figure 5 is a block diagram of a vehicle according to one embodiment of the present invention.

[0024] Reference numerals: Battery system 100; Power battery 60; starting battery 61; low voltage load 62; First battery module 70; first switch 71; second switch 72; first battery information collector 73; insurance module 74; battery management system 76; Vehicle 99. DETAILED DESCRIPTION

[0025] The embodiments described with reference to the drawings are exemplary, and embodiments of the present invention are described in detail below.

[0026] In related technologies, for example, a power battery is connected to a high-low voltage conversion module DC / DC, and after a series of voltage reduction, rectification, and filtering, it supplies power to low-voltage loads and charges the starting battery.

[0027] However, the above approach has the problem of a more complex battery system, higher manufacturing, maintenance and after-sales costs, and the problem of balancing the high-voltage battery, which increases the risk of overcharging and over-discharging, reducing the performance and life of the power battery.

[0028] Therefore, the charging control method of the battery system according to the embodiment of the present invention determines the target voltage by obtaining the operating voltage of the battery module in the battery system, obtains the connection status of the starting battery and the battery module to determine the current voltage, and sets the conditions for replacing the battery module connected to the starting battery based on the current voltage and the operating voltage, so that the starting battery is always charged with the battery module corresponding to the target voltage (such as the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance and after-sales costs of the battery system.

[0029] The above-mentioned charging control method of the battery system performs charging control based on the battery system, and the battery system is described below with an example.

[0030] First, refer to Figure 1 A block diagram of a battery system according to an embodiment of the present invention is described.

[0031] like Figure 1 FIG2 is a block diagram of a battery system according to an embodiment of the present invention. The battery system 100 according to the embodiment of the present invention includes: a power battery 60 and a starting battery 61 .

[0032] Specifically, combined Figure 2 The figure shows a block diagram of the battery system according to an embodiment of the present invention. The power battery 60 includes n battery modules, n battery information collectors, n switch groups, a fuse module 74 and a battery management system 76. (First battery module 70) to , insurance module 74 such as low voltage output insurance FU (Fuse), battery information collector such as BIC (Battery Information Collector), battery management system 76 such as BMS (Battery Management System); n BIC such as (First battery information collector 73) to , n switch groups such as (first switch 71) and (Second switch 72) to and , n takes consecutive integers greater than zero. When n is equal, the modules, BICs and switch groups are in a one-to-one correspondence. The power battery 60 is evenly divided into n battery modules according to the requirements. All battery modules have the same number of cells and the same voltage level, which is slightly higher than the 12V rated voltage of the starting battery. For example, if the power battery is composed of 200 cells with a rated voltage of 3.2V connected in series, and its total rated voltage is 640V, the power battery is evenly divided into 50 battery modules, that is, n is 50, and each battery module has 4 cells and a rated voltage of 12.8V. Each switch group contains two switches, which can be relays or MOS tubes. There is a one-to-one correspondence between n battery modules, n BICs, and n switch groups. The i-th (i =1,2,…n) switch groups have their live wires connected to the two ends of the i-th battery module, respectively; the broken wires of the two switches of the i-th switch group are connected to the positive and negative poles of the starting battery 61; the control wires of the two switches of the i-th switch group are simultaneously connected to the i-th I / O port of the battery management system 76, that is, one I / O port simultaneously controls the two switches of the switch group; the i-th BIC collects the voltage of the i-th module and then sends it to the battery management system 76. The battery management system 76 controls the corresponding switch group to be attracted according to the voltage of the n battery modules, and the corresponding battery module charges the starting battery.

[0033] Based on the above battery system 100, Figure 1-Figure 4 A charging control method for a battery system according to an embodiment of the present invention is described.

[0034] like Figure 3 FIG2 is a flow chart of a method for controlling charging of a battery system according to an embodiment of the present invention. The method for controlling charging of a battery system according to an embodiment of the present invention comprises at least steps S1 to S3.

[0035] Step S1, obtaining the operating voltage of the battery module in the battery system and the connection status between the starting battery and the battery module in the battery system.

[0036] In an embodiment, the operating voltage, such as the voltage of the first battery module 70, is obtained by the first battery information collector 73; for example, n BICs collect the operating voltage of the nth battery module and send the collected operating voltage to the battery management system 76. The battery management system 76 obtains the operating voltages of the n battery modules in the battery system, as well as the connection status between the starting battery and the battery and the module, to prepare data for determining the target voltage and current voltage of the battery module.

[0037] Step S2: determining the target voltage and current voltage of the battery module according to the operating voltage and the connection status.

[0038] In an embodiment, the target voltage is a voltage under conditions that meet requirements and experimental calibration, for example, the operating voltage is the maximum operating voltage of all battery modules. It can be understood that the target voltage is set according to the conditions and is not limited to the maximum operating voltage; the current voltage is the operating voltage of the battery module currently connected to the starting battery; the maximum operating voltage of all the working voltages corresponding to all the battery modules obtained is used as the target voltage, the battery module currently connected to the starting battery is determined according to the connection status, and the working voltage of the battery module currently connected to the starting battery is obtained as the current voltage, so as to prepare data for determining the working voltage for charging the starting battery according to the voltage.

[0039] Step S3: charging the starting battery according to the target voltage and the current voltage.

[0040] In an embodiment, the operating voltage for charging the starting battery is determined based on the target voltage and the current voltage, and the starting battery is charged. Specifically, when the vehicle is in different operating modes, the conditions for replacing the battery module connected to the starting battery in different operating modes are set based on the target voltage and the operating voltage according to the demand for charging the starting battery in each operating mode, so that the battery module with the largest operating voltage is always used to charge the starting battery. This is an active battery balancing method, which can keep the operating voltage deviation of each battery module within the expected range, avoid overcharging and over-discharging, maintain the performance of the power battery, extend its life, and reduce the complexity, manufacturing, maintenance and after-sales costs of the battery system.

[0041] According to the charging control method of the battery system of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with the battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0042] In some embodiments, the target voltage and current voltage of the battery module are determined according to the operating voltage and the connection state, including: obtaining the target voltage when the operating voltage meets a first preset condition; and obtaining the current voltage when the connection state is connected.

[0043] In an embodiment, Figure 2As shown, the first preset condition is a condition set according to demand and experimental calibration, for example, the operating voltage is the maximum operating voltage of all battery modules; when the operating voltage of the i-th battery module is the maximum operating voltage of the n battery modules, the operating voltage of the i-th battery module is taken as the target voltage, set to , so as to select an alternative charging voltage for charging the starting battery according to the first preset condition; when the battery management system 76 obtains that the connection status between the starting battery and the j-th (j=1,2,…n) battery module is connected, it is considered that the battery module currently charging the starting battery is the j-th battery module, and the operating voltage of the j-th battery module is obtained as the current voltage, which is set as , in preparation for selecting the optimal battery module to charge the starting battery.

[0044] In some embodiments, charging the starting battery according to the target voltage and the current voltage includes: when the vehicle is in a first operating mode, determining a voltage difference according to the target voltage and the current voltage; when the voltage difference meets a first preset voltage threshold, controlling the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery.

[0045] In an embodiment, Figure 2 As shown, the first working mode is, for example, when the vehicle is in a power-on or charge-discharge working mode; the first preset voltage threshold is a critical value for determining whether to replace the battery module for starting battery charging; when the vehicle is in a power-on or charge-discharge working mode, the target voltage and the current voltage are calculated to determine the voltage difference, i.e. - The difference is used to determine whether to replace the battery module for starting battery charging; the first preset voltage threshold is set to 100mV. When the voltage difference meets the first preset voltage threshold, that is, - When the voltage of the battery pack currently charging the starting battery is ≥ 100mV, it is considered that the voltage of the battery pack currently charging the starting battery is not the maximum operating voltage of all battery modules. In this case, it is necessary to control the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery, so that in the first working mode, the operating voltage of the battery module charging the starting battery is the maximum voltage of all battery modules.

[0046] In some embodiments, charging the starting battery according to the target voltage and the current voltage includes: when the vehicle is in the second operating mode and the target voltage and the current voltage meet a second preset condition, controlling the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery.

[0047] In an embodiment, Figure 2 As shown, the second working mode is for example a vehicle power-down sleep mode; the second preset condition is a condition for determining whether to replace the battery module for starting battery charging, for example, at the current voltage With target voltage If the voltages of the battery modules connected to the starting battery are equal, or the j-th battery module and the i-th battery module are the same battery module, then the operating voltage of the battery module currently charging the starting battery is the maximum operating voltage of all battery modules, and there is no need to replace the battery module connected to the starting battery. Otherwise, the battery module connected to the starting battery needs to be replaced. When the vehicle is in power-down sleep mode, the battery management system 76 determines the current voltage. With target voltage are equal, or the j-th battery module and the ith battery module are the same battery module, then it means that the operating voltage of the battery module currently charging the starting battery is already the maximum operating voltage of all battery modules, and there is no need to replace the connected battery module for the starting battery. Otherwise, the battery module connected to the starting battery is replaced by controlling the corresponding switch of the battery module to be disconnected or connected to charge the starting battery, so that in the second operating mode, the operating voltage of the battery module charging the starting battery is the maximum voltage of all battery modules.

[0048] In some embodiments, controlling the corresponding switch of the battery module to be turned on or off includes: controlling the corresponding switch of the battery module at the current voltage to be turned off; and controlling the corresponding switch of the battery module at the target voltage to be turned on after a first preset time.

[0049] In an embodiment, Figure 2 As shown, the first preset time is a time value for preventing the power battery from short-circuiting when the control switch is disconnected and connected, and is set to 50ms.

[0050] The vehicle is in the first operating mode, when the battery management system 76 determines - ≥ 100mV, control the switch group connecting the starting battery 61 and the jth battery module and Disconnect, in order to avoid short circuit of power battery, after 50ms delay, control the switch group connecting starting battery 61 and i-th battery module and The i-th battery module is pulled in, and the starting battery is charged by the i-th battery module. During the process of charging the starting battery 61, its voltage will continue to drop. If at a certain moment, the battery module with the maximum operating voltage is the k-th (k=1,2,…n) battery module, then the target voltage becomes , the current voltage at this time is ,like - ≥ 100mV, the battery management system 76 controls the switch group connecting the starting battery 61 to the i-th battery module and Disconnect, in order to avoid short circuit of power battery, after 50ms delay, control the switch group connecting starting battery 61 and kth battery module and The kth battery module is pulled in and charges the starting battery. The above process is continuously repeated to ensure that in the first working mode, the battery module with the maximum working voltage is always used to charge the starting battery. This is a battery braking balancing method that can keep the voltage deviation of each module within the expected range, avoid overcharging and over-discharging, maintain the performance of the power battery, and extend its life. In addition, the switching frequency of the switch group is low, the life is long, and the reliability is high.

[0051] For example, if the battery module currently connected to the starting battery is the 10th battery module, whose voltage is 11V; the battery module with the maximum operating voltage is the 11th battery module, whose voltage is 12V, and 12V - 11V ≥ 100mV, then the battery management system 76 controls the switch group connecting the starting battery 61 to the 10th battery module. and Disconnect, after a delay of 50ms, control the switch group connecting the starting battery 61 and the 11th battery module and The 11th battery module is energized to charge the starting battery 61. During the charging process of the 11th battery module, its voltage will continue to drop. Assume that it drops to 10V. If at a certain moment, the battery module with the maximum operating voltage is the 20th battery module, and its voltage is 12V, and 12V - 10V ≥ 100mV, then the battery management system 76 controls the switch group connecting the starting battery 61 to the 11th battery module. and Disconnect, after a delay of 50ms, control the switch group connecting the starting battery 61 and the 20th battery module and The 20th battery module is pulled in and charges the starting battery 61, and the above process is continuously cycled.

[0052] In the second working mode of the vehicle, the battery management system 76 determines the current voltage With target voltage If the voltages of the battery modules connected to the starting battery 61 and the jth battery module are equal, or the jth battery module and the ith battery module are the same battery module, then the operating voltage of the battery module currently charging the starting battery is already the maximum operating voltage of all battery modules, and there is no need to replace the connected battery module for the starting battery. Otherwise, the battery management system 76 controls the switch group connecting the starting battery 61 and the jth battery module. and Disconnect, in order to avoid short circuit of power battery, after 50ms delay, control the switch group connecting starting battery 61 and i-th battery module and Pull in, the i-th battery module charges the starting battery, and the current voltage becomes During the process of charging the starting battery 61 by the i-th battery module, its voltage will continue to drop. After 24 hours, the battery management system 76 receives the working voltages of all battery modules again. If the battery module with the maximum working voltage is the k-th (k=1,2,…n) battery module, the target voltage becomes , current voltage , the battery management system 76 determines the current voltage With target voltage If the voltages of the battery modules connected to the starting battery 61 are equal, or the i-th battery module and the k-th battery module are the same battery module, then the operating voltage of the battery module currently charging the starting battery is already the maximum operating voltage among all the battery modules, and there is no need to replace the connected battery module for the starting battery. Otherwise, the battery management system 76 controls the switch group connecting the starting battery 61 to the i-th battery module. and Disconnect, in order to avoid short circuit of power battery, after 50ms delay, control the switch group connecting starting battery 61 and kth battery module and The kth battery module is pulled in and charges the starting battery. The above process is continuously repeated to ensure that in the second working mode, the starting battery is always charged by the battery module with the maximum working voltage. This is a battery braking balancing method that can keep the voltage deviation of each module within the expected range, avoid overcharging and over-discharging, maintain the performance of the power battery, and extend its life. In addition, the switching frequency of the switch group is low, the life is long, and the reliability is high.

[0053] For example, if the battery module currently connected to the starting battery is the 30th battery module, whose voltage is 11V; the battery module with the maximum operating voltage is the 31st battery module, whose voltage is 12V, then the battery management system 76 controls the switch group connecting the starting battery 61 to the 30th battery module. and Disconnect, after a delay of 50ms, control the switch group connecting the starting battery 61 and the 31st battery module and The 31st battery module is energized to charge the starting battery 61. During the charging process of the 31st battery module, its voltage will continue to drop. After 24 hours, it will drop to 10V. The battery module with the maximum operating voltage is the 33rd battery module, whose voltage is 12V. Then the battery management system 76 controls the switch group connecting the starting battery 61 and the 31st battery module. and Disconnect, after a delay of 50ms, control the switch group connecting the starting battery 61 and the 33rd battery module and The 33rd battery module is energized to charge the starting battery 61, and the above process is continuously cycled.

[0054] In some embodiments, obtaining the operating voltage of a battery module in a battery system includes: controlling a switch in the battery system to maintain a first state; in a first operating mode, obtaining the operating voltage of the battery module according to a third preset condition; in a second operating mode, obtaining the operating voltage of the battery module according to a fourth preset condition.

[0055] In an embodiment, the third preset condition is a condition for obtaining the operating voltage frequency in the first working mode determined according to demand and experimental calibration, for example, when the first working mode is when the vehicle is powered on or charging and discharging, the third preset condition is to obtain the operating voltage in real time; the fourth preset condition is a condition for obtaining the operating voltage frequency in the second working mode determined according to demand and experimental calibration, for example, when the second working mode is when the vehicle is powered off and in sleep mode, the fourth preset condition is to obtain the operating voltage every 24 hours; in the first working mode, the battery management system 76 controls the switch groups corresponding to all battery modules to maintain the state at that moment, the battery information collector collects the operating voltage of the battery module in real time, and then sends it to the battery management system 76, the battery management system 76 receives the operating voltage of all battery modules in real time, and prepares data for determining the target voltage in the first working mode; in the second working mode, the battery management system 76 controls the switch groups corresponding to all battery modules to maintain the state at that moment, the battery information collector collects the operating voltage of the battery module every 24 hours, and then sends it to the battery management system 76, the battery management system 76 receives the operating voltage of all battery modules, and prepares data for determining the target voltage in the second working mode; Reference below Figure 4 The charging control method of the battery system according to the embodiment of the present invention is described in detail.

[0056] like Figure 4 FIG. 1 is a flow chart of a method for controlling charging of a battery system according to another embodiment of the present invention. The method for controlling charging of a battery system according to the embodiment of the present invention includes at least steps S80 to S98.

[0057] Step S80, start.

[0058] Step S81: Determine whether the vehicle is in the first operating mode. If so, execute steps S82 and S84; otherwise, execute step S89.

[0059] Step S82: Acquire the connection status between the starting battery and the battery module in the battery system.

[0060] Step S83: When the connection state is connected, obtain the current voltage.

[0061] Step S84: Control the switch in the battery system to maintain the first state.

[0062] Step S85: obtaining the operating voltage of the battery module according to the third preset condition.

[0063] Step S86: When the operating voltage meets the first preset condition, a target voltage is obtained.

[0064] Step S87: determining a voltage difference according to the target voltage and the current voltage.

[0065] Step S88: Determine whether the voltage difference satisfies a first preset voltage threshold. If so, execute step S96; otherwise, execute steps S82 and S84.

[0066] Step S89: The vehicle is in the second operating mode.

[0067] Step S90: Control the switch in the battery system to maintain the first state.

[0068] Step S91: Determine whether the time satisfies a fourth preset condition. If so, execute step S92; otherwise, execute steps S90 and S93.

[0069] Step S92: Obtain the operating voltage of the battery module.

[0070] Step S93: Acquire the connection status between the starting battery and the battery module in the battery system.

[0071] Step S94: when the connection state is connected, obtain the current voltage.

[0072] Step S95: Determine whether the target voltage and the current voltage meet a second preset condition. If so, go to step S96; otherwise, go to step S98.

[0073] Step S96: Control the corresponding switch of the battery module at the current voltage to be turned off.

[0074] In step S97, after the first preset time, the corresponding switch of the battery module at the target voltage is controlled to be turned on to charge the startup battery.

[0075] In step S98, the corresponding switch state of the battery module remains unchanged, and the process continues with step S81.

[0076] According to the charging control method of the battery system of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with the battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0077] Reference below Figure 2 A battery system according to an embodiment of the present invention is described.

[0078] like Figure 2 As shown, the battery system 100 of the embodiment of the present invention includes: an acquisition module, which is used to obtain the operating voltage of the battery module in the battery system; a battery management system 76, which is connected to the acquisition module and is used to obtain the connection status between the starting battery and the battery module in the battery system, determine the target voltage and current voltage of the battery module according to the operating voltage and the connection status, and charge the starting battery in the battery system according to the target voltage and the current voltage.

[0079] Among them, the acquisition module includes n BICs, such as arrive , can complete voltage sampling, temperature sampling and communication with; the battery management system 76 can monitor and manage the battery status to ensure the safety and efficient use of the battery. Its main functions include data acquisition, status monitoring, safety protection, charging control, energy control, balancing management, thermal management information management, etc.; the i-th Collect the i-th battery module The voltage is then sent to the battery management system 76.

[0080] In some embodiments, as Figure 2 As shown, the battery system 100 also includes: a fuse module 74, one end of the fuse module 74 is connected to the positive electrode of the starting battery, and is used to start the protection circuit where the battery is located to prevent the circuit from being damaged due to overload or short circuit; a battery module, the positive electrode of the battery module is connected to the other end of the fuse module 74, and is used to provide a charging voltage; two switches corresponding to each battery module, the through lines of the two switches are respectively connected to the two ends of the module, and the broken lines of the two switches are respectively connected to the positive and negative electrodes of the starting battery, and the control lines of the two switches are connected to the I / O port of the battery management system, that is, the I / O port of the battery management system 76 for controlling the switch group, and each I / O port controls the two switches of the switch group at the same time.

[0081] The battery module includes n battery modules, for example arrive , each battery module corresponds to a switch group, that is, two switches; the two switches of the i-th switch group are connected to the i-th module respectively. the two switches of the i-th switch group are disconnected and connected to the positive and negative electrodes of the starting battery 61; the control lines of the two switches of the i-th switch group are connected to the i-th I / O port of the battery management system 76.

[0082] As can be understood, in battery system 100, the power battery is divided into n battery modules, and the battery module with the highest operating voltage is used to charge the starting battery. This eliminates the need for a DC / DC high- and low-voltage converter, resolving the complexity and high cost of existing high- and low-voltage conversion systems. This reduces vehicle manufacturing and maintenance costs, increases the effective space of the vehicle, and enhances the user experience. Furthermore, in battery system 100, the existing BIC and BMS of the power battery are reused, with minimal changes to the mechanical and electrical structure and the cell connection method. This makes the battery system highly applicable and adaptable.

[0083] According to the battery system 100 of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery modules in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery modules. Based on the current voltage and the operating voltage, the conditions for replacing the battery modules connected to the starting battery are set. This ensures that the starting battery is always charged with a battery module corresponding to a target voltage that meets the requirements (e.g., the maximum operating voltage). This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0084] In some embodiments, the battery management system 76 is used to determine the target voltage and current voltage of the battery module based on the operating voltage and connection status, including: obtaining the target voltage when the operating voltage meets the first preset condition; and obtaining the current voltage when the connection status is connected.

[0085] In some embodiments, the battery management system 76 is used to: charge the starting battery according to the target voltage and the current voltage, including: when the vehicle is in a first operating mode, determining the voltage difference according to the target voltage and the current voltage; when the voltage difference meets a first preset voltage threshold, controlling the corresponding switch of the battery module to be disconnected or turned on to charge the starting battery.

[0086] In some embodiments, the battery management system 76 is used to charge the starting battery according to the target voltage and the current voltage, including: when the vehicle is in the second operating mode and the target voltage and the current voltage meet the second preset condition, controlling the corresponding switch of the battery module to disconnect or turn on to charge the starting battery.

[0087] In some embodiments, the battery management system 76 is used to: control the corresponding switch of the battery module to be disconnected or connected, including: controlling the corresponding switch of the battery module at the current voltage to be disconnected; after the first preset time, controlling the corresponding switch of the battery module at the target voltage to be connected.

[0088] In some embodiments, the battery management system 76 is used to: obtain the operating voltage of the battery module in the battery system, including: controlling the switch in the battery system to maintain a first state; in a first operating mode, obtaining the operating voltage of the battery module according to a third preset condition; in a second operating mode, obtaining the operating voltage of the battery module according to a fourth preset condition.

[0089] According to the battery system 100 of an embodiment of the present invention, the target voltage is determined by obtaining the operating voltage of the battery modules in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery modules. Based on the current voltage and the operating voltage, the conditions for replacing the battery modules connected to the starting battery are set. This ensures that the starting battery is always charged with a battery module corresponding to a target voltage that meets the requirements (e.g., the maximum operating voltage). This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0090] Reference below Figure 5 The vehicle of an embodiment of the present invention is described. The target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with a battery module corresponding to the target voltage (e.g., the maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system.

[0091] like Figure 5 FIG. 1 is a block diagram of a vehicle according to an embodiment of the present invention. A vehicle 99 according to an embodiment of the present invention includes a battery system 100 as required in the above embodiment.

[0092] According to the vehicle 99 of the embodiment of the present invention, the battery system 100 is used on the vehicle 99. The target voltage is determined by obtaining the operating voltage of the battery module in the battery system, and the current voltage is determined by obtaining the connection status of the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with the battery module corresponding to the target voltage (such as the maximum operating voltage) that meets the requirements. This is an active battery balancing method, which reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance and after-sales costs of the battery system.

[0093] The following describes a computer program product according to an embodiment of the present invention.

[0094] The computer program product of the embodiment of the present invention includes a computer program, and when the computer program is executed by a processor, the charging control method of the battery system of the above embodiment is implemented.

[0095] According to the computer program product of an embodiment of the present invention, a target voltage is determined by obtaining the operating voltage of a battery module in a battery system, and the current voltage is determined by obtaining the connection status between the starting battery and the battery module. Based on the current voltage and the operating voltage, the conditions for replacing the battery module connected to the starting battery are set, so that the starting battery is always charged with a battery module corresponding to a target voltage (e.g., a maximum operating voltage) that meets the requirements. This is an active battery balancing method that reduces the risk of overcharging and over-discharging, improves the performance and life of the power battery, and reduces the complexity, manufacturing, maintenance, and after-sales costs of the battery system. Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0096] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A charging control method for a battery system, characterized in that: include: Obtaining the operating voltage of the battery module in the battery system and the connection status between the starting battery and the battery module in the battery system; Determining a target voltage and a current voltage of the battery module according to the operating voltage and the connection state; The starting battery is charged according to the target voltage and the current voltage.

2. The charging control method of the battery system according to claim 1, characterized in that: Determining a target voltage and a current voltage of the battery module according to the operating voltage and the connection state includes: When the operating voltage meets a first preset condition, obtaining a target voltage; When the connection state is connected, the current voltage is obtained.

3. The battery system charging control method according to claim 1 or 2, characterized in that: Charging the starting battery according to the target voltage and the current voltage includes: The vehicle determines a voltage difference according to the target voltage and the current voltage in the first operating mode; When the voltage difference meets a first preset voltage threshold, the corresponding switch of the battery module is controlled to be disconnected or connected to charge the startup battery.

4. The battery system charging control method according to claim 1 or 2, characterized in that: Charging the starting battery according to the target voltage and the current voltage includes: When the vehicle is in the second working mode and the target voltage and the current voltage meet a second preset condition, the corresponding switch of the battery module is controlled to be disconnected or connected to charge the starting battery.

5. The charging control method of the battery system according to claim 3 or 4, characterized in that: Control the corresponding switch of the battery module to disconnect or conduct, including: Control the corresponding switch of the battery module at the current voltage to disconnect; After the first preset time, the corresponding switch of the battery module under the target voltage is controlled to be turned on.

6. The charging control method of the battery system according to claim 1, characterized in that: Obtain the operating voltage of the battery module in the battery system, including: controlling a switch in the battery system to maintain a first state; In the first working mode, obtaining the working voltage of the battery module according to the third preset condition; In the second operating mode, the operating voltage of the battery module is obtained according to the fourth preset condition.

7. A battery system, characterized in that: include: An acquisition module is used to obtain the operating voltage of the battery module in the battery system; A battery management system is connected to the acquisition module and is used to obtain the connection status of the starting battery and the battery module in the battery system, determine the target voltage and current voltage of the battery module according to the operating voltage and the connection status, and charge the starting battery in the battery system according to the target voltage and the current voltage.

8. The battery system according to claim 7, characterized in that: The battery system also includes: a fuse module, one end of which is connected to the positive electrode of the starting battery and is used to protect the circuit where the starting battery is located; A battery module, wherein the positive electrode of the battery module is connected to the other end of the fuse module to provide a charging voltage; Each battery module corresponds to two switches, the on-lines of the two switches are respectively connected to the two ends of the battery module, the off-lines of the two switches are respectively connected to the positive and negative poles of the starting battery, and the control lines of the two switches are connected to the I / O port of the battery management system.

9. A vehicle, characterized in that: Comprising the battery system according to any one of claims 7 and 8.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the charging control method of the battery system according to any one of claims 1 to 6 is implemented.

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