Battery device, battery management method and vehicle

Abstract

The invention relates to the field of automobile power batteries, in particular to a battery device, a battery management method and a vehicle, the battery device comprises a power battery module, the power battery module is formed by connecting a first number of battery cells and a second number of battery cells in series, the second number of battery cells form a starting battery, and the starting battery is used for being connected with a low-voltage load; the first switch is arranged between the starting battery and the first number of battery cells, the first switch is used for being switched off when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value so as to charge the starting battery, and by additionally arranging the series switch between the first number of battery cells and the starting battery, when the voltage difference is too large, the first switch is switched off so as to charge the starting battery. Therefore, when the voltage meets the requirement, the series switch can be closed and high-voltage power supply can be carried out, the low-voltage power supply function of the whole vehicle can be ensured to be normal, and the loss of the pure power endurance mileage of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automotive power batteries, and in particular to a battery device, a battery management method and a vehicle. Background Art

[0002] At present, the power battery and starting battery in new energy vehicles are respectively used as energy storage units of new energy vehicles, and their performance directly affects the performance of the vehicle. In order to ensure that the power battery can work efficiently, reliably and safely, it is necessary to effectively manage the power battery and starting battery.

[0003] At present, some cells of the reused power battery are used as starting batteries. When the power battery is supplied with high voltage, the starting battery supplies power at low voltage, which will cause a pressure difference problem among the series-connected cells inside the power battery (i.e., the starting battery and the remaining cells of the power battery). If the pressure difference is too large, high voltage power cannot be supplied directly, resulting in a significant loss in the vehicle's electric range, thereby increasing the battery manufacturing cost.

[0004] Therefore, how to solve the internal voltage difference of the reused power battery and supply power with normal high voltage has become an urgent problem to be solved. Summary of the invention

[0005] In view of this, embodiments of the present invention provide a battery device, a battery management method and a vehicle to solve the internal pressure difference problem of reused power batteries.

[0006] In a first aspect, an embodiment of the present invention provides a battery device, comprising:

[0007] A power battery module, wherein the power battery module is composed of a first number of battery cells and a second number of battery cells connected in series, wherein the second number of battery cells constitute a starting battery, and the starting battery is used to connect a low-voltage load;

[0008] A first switch is disposed between the starting battery and the first number of battery cells, and the first switch is used to disconnect when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, so as to charge the starting battery.

[0009] In a second aspect, an embodiment of the present invention provides a battery management method, which is applied to the battery device according to the first aspect, and the battery management method includes:

[0010] Acquire a first voltage of the starting battery and a second voltage of the first number of battery cells, and calculate a voltage difference between the starting battery and the first number of battery cells according to the first voltage and the second voltage;

[0011] When it is detected that the voltage difference between the starting battery and the first number of battery cells exceeds a threshold, the first switch is controlled to be disconnected.

[0012] In a third aspect, an embodiment of the present invention provides a vehicle, comprising the battery device as described in the first aspect.

[0013] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0014] The present invention provides a battery device, comprising: a power battery module, the power battery module is composed of a first number of battery cells and a second number of battery cells connected in series, wherein the second number of battery cells constitutes a starting battery, and the starting battery is used to connect a low-voltage load; a first switch, the first switch is arranged between the starting battery and the first number of battery cells, and the first switch is used to disconnect when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, so as to charge the starting battery. Among them, a series switch is added between the first number of battery cells in the power battery module and the starting battery, so that the series switch is disconnected before high-voltage power supply, and then the voltage difference between the first number of battery cells in the power battery module and the starting battery is detected. When the voltage difference is too large, the starting battery is charged and the charge is balanced, so that when the voltage meets the requirements, the series switch is closed and high-voltage power supply is performed, which can ensure that the low-voltage power supply function of the whole vehicle is normal, reduce the loss of pure electric cruising range of the whole vehicle, and avoid increasing costs due to shortened cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a structural block diagram of a battery device provided in Embodiment 1 of the present invention;

[0017] Figure 2 is a structural block diagram of a battery device provided in Embodiment 2 of the present invention;

[0018] Figure 3 is a structural block diagram of a battery device provided in Embodiment 3 of the present invention;

[0019] Figure 4 is a structural block diagram of a battery device provided by Embodiment 4 of the present invention;

[0020] Figure 5 is a flowchart of a battery management method provided in Embodiment 5 of the present invention;

[0021] Figure 6 is a structural diagram of a computer device provided by Embodiment 7 of the present invention;

[0022] Among them, 1. battery device; 10. power battery module; 11. first switch; 101. first number of battery cells; 102. starting battery; 12. DC converter; 13. second switch; 14. battery distribution unit; 15. power battery management unit; 2. low voltage load. DETAILED DESCRIPTION

[0023] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0024] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0026] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.

[0027] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0028] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0029] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0030] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0031] See also Figure 1 , is a structural block diagram of a battery device provided in Embodiment 1 of the present invention, such as Figure 1 As shown, the battery device 1 includes a power battery module 10, wherein the power battery module 10 is composed of a first number of battery cells 101 and a second number of battery cells connected in series, wherein the second number of battery cells constitute a starting battery 102, and the starting battery 102 is used to connect a low-voltage load 2;

[0032] The first switch 11 is disposed between the starting battery 102 and the first number of battery cells 101 , and the first switch 11 is used to disconnect when the voltage difference between the starting battery 102 and the first number of battery cells 101 exceeds a threshold value, so as to charge the starting battery 102 .

[0033] The power battery module is used to provide a power source for the vehicle, and the starting battery is used to power the vehicle's electrical appliances. The low-voltage load refers to electrical equipment connected in series with the starting battery, including but not limited to lights, meters, wipers, etc. The first switch is used to control the disconnection of the first number of battery cells and the starting battery.

[0034] In an embodiment of the present invention, the power battery module includes a first number of battery cells and a second number of battery cells. The second number of battery cells in a module corresponding to the power battery constitutes a low-voltage power supply source, referred to as a starting battery. For example, the second number is 4. A first switch is set on the series connection line of the first number of battery cells in the power battery module and the starting battery so that they can be connected in series. The first switch can also be called a series switch. When the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, the series switch will be disconnected, and then the starting battery will be charged. Conversely, when the voltage difference between the starting battery and the first number of battery cells does not exceed a threshold value, the series switch will be closed, thereby connecting the starting battery and the first number of battery cells in series, and the power battery module supplies power to the low-voltage load and ensures the pure electric range of the whole vehicle.

[0035] The first switch in the embodiment of the present invention adopts a relay, but it can be understood that the device of the first switch can also use a push button switch or other switch devices that can achieve the same effect. Taking the relay as an example, when the vehicle is in the ON / OK gear, the pressure difference between the starting battery and the first number of battery cells is determined. If the pressure difference does not exceed the threshold, the relay between the first number of battery cells and the starting battery is closed, and the first number of battery cells and the starting battery are controlled to supply power to the low-voltage load at the same time, that is, the power battery module is controlled to supply power to the low-voltage load. If the pressure difference exceeds the threshold, the starting battery will send a charging request, thereby disconnecting the relay between the first number of battery cells and the starting battery, and the first number of battery cells are charged for the starting battery, so that the first number of battery cells and the starting battery maintain a normal pressure difference range.

[0036] It should be noted that when the vehicle is in the OFF position, the first switch is also in the disconnected state, and the low-voltage load of the entire vehicle is powered by the starting battery to ensure that after the vehicle enters the sleep state, the starting battery enters the low power consumption mode to reduce the power loss of the starting battery.

[0037] Optionally, the battery device also includes a DC converter, a first connection port of the DC converter is connected to the first number of battery cells, and a second connection port of the DC converter is connected to the starting battery, and the DC converter is used to reduce the voltage of the first number of battery cells to charge the starting battery when the first switch is disconnected.

[0038] In the embodiment of the present invention, the DC converter converts a DC power supply into another DC power supply with a different output type. Figure 2 , is a structural block diagram of a battery device provided in Embodiment 2 of the present invention, Figure 2The DC converter 12 includes two connection ports, a first connection port and a second connection port. The first connection port of the DC converter 12 is connected to a first number of battery cells, and the second connection port of the DC converter 12 is connected to a starting battery. When it is detected that the power of the starting battery is too low, the first switch is disconnected, and then the first number of battery cells charge the starting battery through the DC converter.

[0039] Optionally, a third terminal of the DC converter is connected to the low-voltage load, and the DC converter is used to reduce the voltage of the power battery module to supply power to the low-voltage load when the first switch is closed.

[0040] See also Figure 2 In the embodiment of the present invention, the DC converter 12 is also connected to the low-voltage load 2. When the first switch is closed, it means that the voltage difference between the first number of battery cells and the starting battery meets the threshold value. By closing the first switch, the first number of battery cells and the starting battery pack are connected in series, and then the first number of battery cells and the starting battery are controlled to output power at the same time, that is, the power battery module supplies power to the low-voltage load after the voltage is reduced by the DC converter.

[0041] Optionally, the battery device further includes a second switch, which is disposed between the DC converter and the low-voltage load, and is configured to be disconnected when the starting battery is charged to stop supplying power to the low-voltage load.

[0042] In the embodiment of the present invention, the second switch is used to control the power supply of the low-voltage load, and the second switch can be called a low-voltage switch. Figure 3 , is a structural block diagram of a battery device provided in Embodiment 3 of the present invention, Figure 3 In the embodiment, the second switch 13 is arranged on the power supply line connecting the DC converter 12 and the low-voltage load 2. When it is detected that the power of the starting battery is insufficient or the voltage difference between the starting battery and the first number of cells exceeds a threshold value, the second switch is disconnected, and then the starting battery is charged. By disconnecting the second switch, the voltage reduction through the DC converter is stopped to supply power to the low-voltage load.

[0043] Optionally, the battery device also includes a battery distribution unit, a first end of the battery distribution unit is connected to the first number of battery cells, and a second end of the battery distribution unit is connected to the starting battery, and the battery distribution unit is used to control the power battery module to supply power to the low-voltage load through the DC converter when the vehicle is started, and control the starting battery to supply power to the low-voltage load when the vehicle is turned off.

[0044] See also Figure 3 or Figure 2, the first end of the battery distribution unit 14 is connected to the first number of battery cells 101, and the second end of the battery distribution unit 14 is connected to the starting battery 102. In an embodiment of the present invention, the battery distribution unit is an important component of the high-voltage circuit of the electric vehicle, which controls the power-on and power-off process, the pre-charging process, and the charging process of the high-voltage electrical circuit. When the vehicle is in the ON / OK gear, the battery distribution unit controls the power battery module to step down the voltage through the DC converter to supply power to the low-voltage load; when the vehicle is in the OFF gear, the battery distribution unit controls the starting battery to supply power to the low-voltage load to ensure that the low-voltage power supply function of the vehicle is normal.

[0045] Optionally, the battery device further includes a power battery management unit, and the power battery management unit is used to control the first switch.

[0046] See also Figure 4 , is a structural block diagram of a battery device provided in Embodiment 4 of the present invention, Figure 4 In the embodiment of the present invention, the power battery management unit 15 is connected to the starting battery 102 and the first number of battery cells 101 respectively. In the embodiment of the present invention, the power battery management unit is used to monitor the safety and effectively manage the power battery module. The power battery management unit maintains a long-power state and monitors the voltage, current and temperature signals of the starting battery in real time to determine whether the power gear is in the OFF gear or the ON / OK gear, thereby controlling the first switch. For example, in the OFF gear, the power battery management unit controls the first switch to be disconnected, the first number of battery cells and the starting battery are in a disconnected state, and the starting battery supplies power to the low-voltage load; in the ON / OK gear, the power battery management unit first detects whether the voltage difference between the starting battery and the first number of battery cells exceeds the threshold value. If the voltage difference exceeds the threshold value, the first switch is controlled to be disconnected, so that the first number of battery cells are charged and balanced to the starting battery through the DC converter until the voltage difference does not exceed the threshold value, and then the first switch is controlled to be closed, the first number of battery cells and the starting battery are connected in series, and the starting power battery module is started for low-voltage output to ensure the pure electric cruising range of the vehicle.

[0047] Optionally, the battery device further includes a power battery management unit, and the power battery management unit is used to control the first switch and the second switch.

[0048] In the embodiment of the present invention, the power battery management unit controls the first switch and the second switch at the same time. When the power battery management unit detects that the power gear of the vehicle is OFF, the first switch is controlled to be disconnected and the second switch is closed to disconnect the power supply of the first number of cells to the low-voltage load, so that the starting battery supplies power to the low-voltage load. However, in the process of the starting battery supplying power to the low-voltage load, the power of the starting battery is monitored in real time. When it is detected that the power of the starting battery is insufficient, the starting battery will request the first number of cells to be charged. The power battery management unit controls the second switch to be disconnected and the first switch to be disconnected, and at the same time controls the first number of cells to be charged to the starting battery by stepping down the voltage through the DC converter to avoid the starting battery being in a power-deficient state.

[0049] When the power battery management unit detects that the power gear of the vehicle is on / OK, the power battery management unit first determines whether the power of the first number of battery cells is sufficient. If the power of the first number of battery cells is sufficient, it detects whether the voltage difference between the starting battery and the first number of battery cells exceeds the threshold. If the voltage difference between the starting battery and the first number of battery cells does not exceed the threshold, the power battery management unit controls the first switch to close and the second switch to close, so that the power battery module supplies power to the low-voltage load through the DC converter to reduce the voltage. Conversely, if the voltage difference between the starting battery and the first number of battery cells exceeds the threshold, the starting battery will request the first number of battery cells to charge, and the power battery management unit controls the second switch to open and the first switch to open, and at the same time controls the first number of battery cells to reduce the voltage through the DC converter to charge the starting battery, so that the voltage difference between the starting battery and the first number of battery cells is maintained in a balanced state.

[0050] The embodiment of the present invention provides a battery device, including: a power battery module, the power battery module is composed of a first number of battery cells and a second number of battery cells connected in series, wherein the second number of battery cells constitute a starting battery, and the starting battery is used to connect a low-voltage load; a first switch, the first switch is arranged between the starting battery and the first number of battery cells, and the first switch is used to disconnect when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, so as to charge the starting battery. Among them, a series switch is added between the first number of battery cells in the power battery module and the starting battery, so that the series switch is disconnected before the high-voltage power supply, and then the voltage difference between the first number of battery cells in the power battery module and the starting battery is detected. When the voltage difference is too large, the starting battery is charged and the charge is balanced, so that when the voltage meets the requirements, the series switch is closed and the high-voltage power supply is performed, which can ensure that the low-voltage power supply function of the whole vehicle is normal, reduce the loss of the pure electric cruising range of the whole vehicle, and avoid the increase of costs due to shortened cruising range.

[0051] Corresponding to the battery device of the above embodiment, Figure 5A flowchart of a battery management method provided in Embodiment 5 of the present invention is shown. The battery management method is applied to the battery device described in the above embodiment. The battery management method includes the following steps:

[0052] Step S501, obtaining a first voltage of the starting battery and a second voltage of the first number of battery cells, and calculating a voltage difference between the starting battery and the first number of battery cells according to the first voltage and the second voltage.

[0053] Step S502: when it is detected that the voltage difference between the starting battery and the first number of battery cells exceeds a threshold, the first switch is controlled to be disconnected.

[0054] Regarding step S501 and step S502, the relevant descriptions about the starting battery, the first number of battery cells and the first switch have been described in detail in the above-mentioned battery device, and are not repeated here.

[0055] In an embodiment of the present invention, a first voltage of a starting battery and a second voltage of a first number of battery cells are first obtained, and then a voltage difference between the starting battery and the first number of battery cells is calculated based on the first voltage and the second voltage. When the voltage difference exceeds a threshold value, the first switch is controlled to be disconnected, wherein controlling the first switch to be disconnected is divided into two situations, the first situation being: when the vehicle is in an ignition-off state, that is, the power gear of the vehicle is in the OFF gear, the first switch is controlled to be in a disconnected state, the first number of battery cells and the starting battery are in a power-off state, and the low-voltage load of the entire vehicle is powered by the starting battery.

[0056] It is worth noting that before using the starting battery to power the low-voltage load, it is detected whether the power of the starting battery is greater than a first preset power threshold. When it is detected that the power of the starting battery is not greater than the first preset power threshold, it means that the power of the starting battery is insufficient and the starting battery cannot be used to power the low-voltage load. The starting battery will request charging from the first number of battery cells and control the first number of battery cells to charge the starting battery to avoid the starting battery being in a power-deficient state until the power of the starting battery exceeds the first preset power threshold.

[0057] However, before detecting that the power of the starting battery is not greater than the first preset power threshold, controlling the first number of cells to charge the starting battery, detecting whether the first number of cells meets the charging condition, the charging condition means that the power of the first number of cells can charge the starting battery with excess power while ensuring the normal power. If it is detected that the first number of cells does not meet the charging condition, the motor load is controlled to charge the starting battery pack. The motor load may refer to a generator, which is connected to the first number of cells and the starting battery, and is used to charge the first number of cells and the starting battery.

[0058] It should be noted that the first preset power threshold may be the minimum power required by the starting battery when the starting battery supplies power to the low-voltage load. Before detecting that the power of the starting battery is not greater than the first preset power threshold and controlling the first number of cells to charge the starting battery, it is detected whether the power of the first number of cells is greater than the second preset power threshold. If it is detected that the power of the first number of cells is greater than the second preset power threshold, it is determined that the first number of cells meets the charging condition, wherein the third preset power threshold may be the minimum power required by the first number of cells when the first number of cells charges the starting battery.

[0059] The second situation is: when the vehicle is starting, that is, the power gear of the vehicle is in the ON / OK gear, first determine whether the power of the first number of battery cells is sufficient, if the power of the first number of battery cells is sufficient, detect whether the voltage difference between the starting battery and the first number of battery cells exceeds the threshold, if the voltage difference between the starting battery and the first number of battery cells exceeds the threshold, control the first switch to disconnect, and control the first number of battery cells to reduce the voltage through the DC converter to charge the starting battery evenly.

[0060] It should be noted that, when it is detected that the power of the first number of battery cells is sufficient according to the second preset power threshold, and it is detected that the voltage difference between the starting battery and the first number of battery cells does not exceed the threshold, the first switch is controlled to close, so that the starting battery and the first number of battery cells are in a series state, so that the power battery pack supplies power to the low-voltage load; when it is detected that the power of the first number of battery cells is insufficient according to the second preset power threshold, and it is detected that the voltage difference between the starting battery and the first number of battery cells exceeds the threshold, the first switch is controlled to open and the motor load is controlled to charge the starting battery and the first number of battery cells, that is, to charge the power battery module. After charging is completed, it is ensured that the voltage difference between the starting battery and the first number of battery cells does not exceed the threshold. After the voltage difference between the starting battery and the first number of battery cells does not exceed the threshold, the first switch is controlled to close to ensure that the low-voltage power supply function of the entire vehicle is normal.

[0061] Optionally, if the battery device further includes a second switch and a DC converter, a first end of the DC converter is connected to the first number of battery cells, a second end of the DC converter is connected to the starting battery, and the second switch is arranged between the DC converter and the low-voltage load, then the battery management method includes:

[0062] When the first switch is disconnected, the DC converter is controlled to reduce the voltage of the first number of battery cells to charge the starting battery, and the second switch is controlled to be disconnected to stop supplying power to the low-voltage load.

[0063] The relevant descriptions of the second switch and the DC converter have been described in detail in the above-mentioned battery device, and will not be repeated here.

[0064] In an embodiment of the present invention, when it is detected that the power gear of the vehicle is in the OFF gear, the power of the starting battery in the process of supplying power to the low-voltage load is monitored in real time. When it is detected that the power of the starting battery is insufficient, the starting battery will request a first number of battery cells to be charged, and the second switch and the first switch are controlled to be disconnected to stop the starting battery from supplying power to the low-voltage load. At the same time, the first number of battery cells are controlled to step down the voltage through the DC converter to charge the starting battery, so as to avoid the starting battery being in a power-deficient state.

[0065] When the vehicle's power gear is in the ON / OK gear, if the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, the starting battery will request the first number of battery cells to be charged, thereby controlling the second switch to be disconnected and the first switch to be disconnected to stop the starting battery and the first number of battery cells (power battery pack) from supplying power to the low-voltage load, and at the same time controlling the first number of battery cells to step down the voltage through a DC converter to charge the starting battery, so that the voltage difference between the starting battery and the first number of battery cells is maintained in a balanced state.

[0066] An embodiment of the present invention provides a battery management method, which obtains a first voltage of a starting battery and a second voltage of a first number of battery cells, and calculates a voltage difference between the starting battery and the first number of battery cells based on the first voltage and the second voltage; when it is detected that the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, the first switch is controlled to be disconnected, and the pressure difference problem inside the power battery module is solved by controlling the first switch set between the starting battery and the first number of battery cells, thereby reducing the risk of low power of the starting battery, ensuring that the low-voltage power supply function of the entire vehicle is normal, and ensuring that the pure electric cruising range of the entire vehicle is less damaged.

[0067] Embodiment 6 of the present invention provides a vehicle, the vehicle includes the battery device of the embodiment, wherein the battery device includes a power battery module, the power battery module is composed of a first number of battery cells and a second number of battery cells connected in series, wherein the second number of battery cells constitute a starting battery, and the starting battery is used to connect a low-voltage load;

[0068] A first switch is disposed between the starting battery and the first number of battery cells, and the first switch is used to disconnect when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, so as to charge the starting battery.

[0069] Figure 6 This is a schematic diagram of the structure of a computer device provided in Embodiment 7 of the present invention. Figure 6As shown, the computer device of this embodiment includes: at least one processor ( Figure 6 Only one is shown), a memory, and a computer program stored in the memory and executable on at least one processor, wherein when the processor executes the computer program, the steps in any of the above-mentioned battery management method embodiments are implemented.

[0070] The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the figure is merely an example of a computer device and does not constitute a limitation on the computer device. The computer device may include more or fewer components than shown in the figure, or may combine certain components, or different components, such as a network interface, a display screen, and an input device.

[0071] The processor may be a CPU, or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0072] The memory includes a readable storage medium, an internal memory, etc., wherein the internal memory may be the memory of a computer device, and the internal memory provides an environment for the operation of an operating system and computer-readable instructions in the readable storage medium. The readable storage medium may be a hard disk of a computer device, and in other embodiments may also be an external storage device of a computer device, for example, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on a computer device. Further, the memory may also include both an internal storage unit of a computer device and an external storage device. The memory is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as program codes of computer programs, etc. The memory may also be used to temporarily store data that has been output or is to be output.

[0073] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned device can refer to the corresponding process in the above-mentioned method embodiment, which will not be repeated here. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device capable of carrying computer program code, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0074] The present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by a computer program product. When the computer program product runs on a computer device, the computer device can implement the steps in the above-mentioned method embodiment when executing.

[0075] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0077] In the embodiments provided by the present invention, it should be understood that the disclosed devices / computer equipment and methods can be implemented in other ways. For example, the device / computer equipment embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0078] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A battery device, characterized in that: include: A power battery module, wherein the power battery module is composed of a first number of battery cells and a second number of battery cells connected in series, wherein the second number of battery cells constitute a starting battery, and the starting battery is used to connect a low-voltage load; A first switch is disposed between the starting battery and the first number of battery cells, and the first switch is used to disconnect when the voltage difference between the starting battery and the first number of battery cells exceeds a threshold value, so as to charge the starting battery.

2. The battery device according to claim 1, characterized in that: The battery device also includes a DC converter, a first connection port of the DC converter is connected to the first number of battery cells, and a second connection port of the DC converter is connected to the starting battery. The DC converter is used to reduce the voltage of the first number of battery cells to charge the starting battery when the first switch is disconnected.

3. The battery device according to claim 2, characterized in that: The third connection port of the DC converter is connected to the low-voltage load, and the DC converter is used to reduce the voltage of the power battery module to supply power to the low-voltage load when the first switch is closed.

4. The battery device according to claim 2, characterized in that: The battery device also includes a second switch, which is arranged between the DC converter and the low-voltage load. The second switch is used to disconnect when the first number of battery cells charge the starting battery to stop supplying power to the low-voltage load.

5. The battery device according to claim 2, characterized in that: The battery device also includes a battery distribution unit, a first end of the battery distribution unit is connected to the first number of battery cells, and a second end of the battery distribution unit is connected to the starting battery. The battery distribution unit is used to control the power battery module to supply power to the low-voltage load through the DC converter when the vehicle is started, and to control the starting battery to supply power to the low-voltage load when the vehicle is turned off.

6. The battery device according to claim 1, characterized in that: The battery device further includes a power battery management unit, and the power battery management unit is used to control the first switch.

7. The battery device according to claim 4, characterized in that: The battery device further includes a power battery management unit, and the power battery management unit is used to control the first switch and the second switch.

8. A battery management method, characterized in that: The battery management method is applied to the battery device according to any one of claims 1 to 7, and the battery management method comprises: Acquire a first voltage of the starting battery and a second voltage of the first number of battery cells, and calculate a voltage difference between the starting battery and the first number of battery cells according to the first voltage and the second voltage; When it is detected that the voltage difference between the starting battery and the first number of battery cells exceeds a threshold, the first switch is controlled to be disconnected.

9. The battery management method according to claim 8, characterized in that: If the battery device further includes a second switch and a DC converter, the first end of the DC converter is connected to the first number of battery cells, the second end of the DC converter is connected to the starting battery, and the second switch is arranged between the DC converter and the low-voltage load, then the battery management method includes: When the first switch is disconnected, the DC converter is controlled to reduce the voltage of the first number of battery cells to charge the starting battery, and the second switch is controlled to be disconnected to stop supplying power to the low-voltage load.

10. A vehicle, comprising the battery device according to any one of claims 1 to 7.

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