Power battery and vehicle

Abstract

The invention provides a power battery and a vehicle, the power battery is composed of a first battery cell assembly and a second battery cell assembly, the first battery cell assembly comprises a plurality of first battery cell modules connected in series, and the second battery cell assembly comprises a plurality of second battery cell modules connected in series. A first battery cell module in the first battery cell assembly and a second battery cell module in the second battery cell assembly supply power to a low-voltage load of the vehicle, and the first battery cell assembly and the second battery cell assembly supply high-voltage power to the vehicle, so that redundant high-low-voltage power supply of the vehicle is realized; a DCDC controller, a storage battery and related sensor parts of the storage battery do not need to be carried in the vehicle, the power supply requirements of high-order intelligent driving and drive-by-wire chassis are met, the development cost and maintenance cost of the whole vehicle are reduced, the weight of the vehicle body is reduced, and the purpose that the low-voltage storage battery is free of maintenance all the time is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of automobiles, and particularly to a power battery and a vehicle. Background Art

[0002] At present, new energy vehicles supply power to electrical appliances through a DCDC (DC-DC Converter) and a low-voltage battery. When the DCDC is not working, the battery supplies power to the electrical appliances. When the DCDC is working, the DCDC supplies power to the electrical appliances and charges the low-voltage battery at the same time.

[0003] However, with the increase in the number of electrical appliances, the demand for the battery power will increase continuously, resulting in an increase in the weight of the battery. Moreover, the number of normal components and the harness cost will increase, leading to high switch cost and maintenance cost of the whole vehicle. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, the present application aims to provide a power battery and a vehicle to solve the problems such as high weight of the battery, large number of components and high harness cost in the related art, and reduce the weight of the whole vehicle while reducing the switch cost and maintenance cost of the whole vehicle.

[0005] An embodiment of the present application provides a power battery for a vehicle. The power battery includes a first battery cell assembly and a second battery cell assembly. The first battery cell assembly includes a plurality of first battery cell modules connected in series, and the second battery cell assembly includes a plurality of second battery cell modules connected in series; One first battery cell module in the first battery cell assembly and one second battery cell module in the second battery cell assembly supply power to the low-voltage load of the vehicle; The first battery cell assembly and the second battery cell assembly supply high-voltage power to the vehicle.

[0006] Optionally, the power battery further includes a battery management controller, a first fuse device and a second fuse device. One end of the first fuse device is connected to the low-voltage load, and the other end is connected to the first battery cell module that supplies power to the low-voltage load. One end of the second fuse device is connected to the low-voltage load, and the other end is connected to the second battery cell module that supplies power to the low-voltage load; The battery management controller disconnects the first fuse device when detecting that the low voltage provided by the first battery cell module is abnormal, and disconnects the second fuse device when detecting that the low voltage provided by the second battery cell module is abnormal.

[0007] Optionally, the power battery further includes a first isolation switch and a second isolation switch. The first isolation switch is disposed between the first battery cell module that powers the low-voltage load and other first battery cell modules, and the second isolation switch is disposed between the second battery cell module that powers the low-voltage load and other second battery cell modules; The battery management controller disconnects the first isolation switch when detecting that the high voltage provided by the first battery cell assembly is abnormal, and disconnects the second isolation switch when detecting that the high voltage provided by the second battery cell assembly is abnormal.

[0008] Optionally, the power battery further includes a first controller, a second controller, two first output control switches, and two second output control switches; The two first output control switches are disposed at the positive and negative terminals of the first battery cell assembly, and the two second output control switches are disposed at the positive and negative terminals of the second battery cell assembly; The first controller disconnects the first output control switch when detecting that the vehicle stops high-voltage power supply; The second controller disconnects the second output control switch when detecting that the vehicle stops high-voltage power supply.

[0009] Optionally, the first controller cuts off the first output control switch when detecting that the high-voltage power supply of the first battery cell assembly is abnormal, and cuts off the second output control switch when detecting that the high-voltage power supply of the second battery cell assembly is abnormal.

[0010] Optionally, the first battery cell assembly and the second battery cell assembly are connected in parallel.

[0011] Optionally, the power battery further includes two first parallel control switches and two second parallel control switches. The first parallel control switches and the second parallel control switches are disposed between the first battery cell assembly and the second battery cell assembly; The first controller cuts off the first parallel control switch when detecting that the high-voltage power supply of the first battery cell assembly is abnormal; The second controller cuts off the second parallel control switch when detecting that the high-voltage power supply of the second battery cell assembly is abnormal.

[0012] Optionally, the first controller cuts off the first parallel control switch when detecting that the second controller node is lost or malfunctioning; The second controller cuts off the second parallel control switch when detecting that the first controller node is lost or malfunctioning.

[0013] Optionally, the first battery cell module and the second battery cell module that supply power to the low-voltage load are connected in parallel.

[0014] An embodiment of the present application further provides a vehicle, and the vehicle includes the power battery provided in any embodiment of the present application.

[0015] In summary, the present application proposes a power battery for a vehicle. The power battery is composed of a first battery cell assembly and a second battery cell assembly. The first battery cell assembly includes a plurality of first battery cell modules connected in series, and the second battery cell assembly includes a plurality of second battery cell modules connected in series. One first battery cell module in the first battery cell assembly and one second battery cell module in the second battery cell assembly supply power to the low-voltage load of the vehicle, and the first battery cell assembly and the second battery cell assembly supply high-voltage power to the vehicle, realizing redundant high- and low-voltage power supply for the vehicle. There is no need to install a DCDC controller, a storage battery, and storage battery-related sensor components in the vehicle, which not only meets the power supply requirements of high-order intelligent driving and by-wire chassis, but also reduces the overall vehicle development cost and maintenance cost, reduces the vehicle body weight, and achieves the purpose of lifetime maintenance-free of the low-voltage battery. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of low-voltage power supply in a related art provided by an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of a power battery of a vehicle provided by an embodiment of the present application; Figure 3 It is a schematic diagram of low-voltage power supply of a power battery provided by an embodiment of the present application; Figure 4 It is a schematic diagram of the assembly of a power battery provided by an embodiment of the present application; Figure 5 It is a schematic diagram of a dual controller of a power battery assembly provided by an embodiment of the present application; Figure 6 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0018] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and not to limit the invention. Additionally, it should be noted that for ease of description, only the parts related to the invention are shown in the drawings.

[0019] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0020] Before introducing the power battery of the vehicle provided by the embodiments of the present application in detail, the technical problems to be solved will be described first.

[0021] In the related art, new energy vehicles usually carry a DCDC and a low-voltage battery, and the power supply for electrical appliances is realized through the low-voltage battery and the DCDC. As Figure 1 shown, Figure 1 is a schematic diagram of low-voltage power supply of a related art provided by the embodiments of the present application. Taking the number of electrical appliances as three as an example, electrical appliances A to C are connected to the DCDC and the battery through a fuse box. When the DCDC is not working, the battery provides low-voltage power for the electrical appliances. When the DCDC is working, the DCDC provides low-voltage power for the electrical appliances and charges the battery at the same time.

[0022] However, with the increase in the number of electrical appliances, the demand for the battery power will continue to increase, and the number of related components such as battery sensors and wiring harnesses will also increase, which will further increase the cost. Therefore, to solve this problem, the embodiments of the present application provide a power battery for a vehicle, which divides the power battery into two cell assemblies, and the two cell assemblies are responsible for high-voltage power supply, and some cell modules in the cell assemblies are responsible for low-voltage power supply. While realizing redundant high- and low-voltage power supply, components such as the DCDC, the battery, and the battery-related sensors are cancelled, which not only meets the power supply requirements of high-order intelligent driving and by-wire chassis, but also reduces the vehicle development cost and maintenance cost, and realizes the lifetime maintenance-free of the low-voltage battery.

[0023] As mentioned in the background art, in view of the problems in the prior art, the present application proposes a power battery for a vehicle. Figure 2 is a schematic structural diagram of a power battery for a vehicle provided by the embodiments of the present application.

[0024] See Figure 2 , this power battery 0 includes a first cell assembly 1 and a second cell assembly 2. The first cell assembly 1 includes a plurality of first cell modules 10 connected in series, and the second cell assembly 2 includes a plurality of second cell modules 20 connected in series; One first battery module 10 in the first battery assembly 1 and one second battery module 20 in the second battery assembly 2 supply power to the low-voltage loads of the vehicle; The first battery assembly 1 and the second battery assembly 2 supply high voltage to the vehicle.

[0025] Among them, the first battery assembly 1 may be composed of a plurality of first battery modules 10 connected in series, and the second battery assembly 2 may be composed of a plurality of second battery modules 20 connected in series. One first battery module 10 in the first battery assembly 1 and one second battery module 20 in the second battery assembly 2 supply power to the electrical appliances in the vehicle.

[0026] In the embodiment of the present application, the first battery module 10 and the second battery module 20 may be composed of a plurality of batteries connected in series, and supply power to the low-voltage loads through the plurality of batteries connected in series inside. Among them, the first battery module 10 and the second battery module 20 may output a voltage of 13.8V through the plurality of batteries connected in series. The voltage standard can be adjusted adaptively according to the battery model.

[0027] Exemplarily, taking the parameter capacity of the battery as 24ah and the nominal voltage as 3.46V as an example, 4 batteries can be connected in series as a group to design the first battery module 10 and the second battery module 20 with an output voltage of 13.8V.

[0028] In the embodiment of the present application, the first battery module 10 and the second battery module 20 responsible for low-voltage power supply can achieve low-voltage redundant power supply. Among them, when the 13.8V low-voltage output of the first battery module 10 is abnormal, the 13.8V low-voltage output of the second battery module 20 can keep working for a long time to supply power to the low-voltage loads of the vehicle. Through the first battery module 10 and the second battery module 20 inside the power battery 0, the power supply architecture can maintain a long-term stable 13.8V low-voltage output through the power of the power battery, thus ensuring the stability of the low-voltage power supply.

[0029] Figure 3 It is a schematic diagram of low-voltage power supply of a power battery provided by an embodiment of the present application. As Figure 3 shown, taking the number of electrical appliances as 3 as an example, a 13.8V battery module (i.e., the first battery module) is arranged inside the first battery assembly, and a 13.8V battery module (i.e., the second battery module) is arranged inside the second battery assembly. A power distribution unit is connected between the electrical appliances and the 13.8V battery module. One end of the electrical appliance is connected to the area power distribution, and the other end is grounded together with the negative electrode of the 13.8V battery module.

[0030] In Figure 3Among them, the 13.8V battery cell module can output a low voltage of 13.8V, and the electrical energy output can be distributed through regional power distribution and allocated to downstream electrical appliances A to C as needed. For example, it can be allocated to the thermal management system, in-vehicle entertainment system, body control system, etc.

[0031] In the embodiment of the present application, each first battery cell module connected in series in the first battery cell assembly and each second battery cell module connected in series in the second battery cell assembly can achieve high-voltage power supply for the vehicle. Among them, for each battery cell assembly, through a plurality of battery cell modules connected in series, a high voltage of about 800V can be output.

[0032] Exemplarily, taking the parameter capacity of the battery cell as 24ah and the nominal voltage as 3.46V as an example, 4 battery cells are connected in series as a group as a battery cell module. For the first battery cell assembly or the second battery cell assembly, it can be composed of 58 series-connected battery cell modules inside, with a total output voltage of 802.72V and a total power of 19.265kWh.

[0033] In the embodiment of the present application, in order to maintain the low-voltage voltage balance, the first battery cell module 10 responsible for low-voltage power supply can also be connected in parallel with the second battery cell module 20. In one example, the first battery cell module and the second battery cell module for supplying power to the low-voltage load are connected in parallel.

[0034] Among them, through the parallel connection between the first battery cell module and the second battery cell module, the voltage balance can be maintained between the first battery cell module and the second battery cell module, further ensuring the stability of low-voltage power supply.

[0035] In the embodiment of the present application, considering that abnormal conditions such as low-voltage overcurrent or low-voltage short circuit may occur during the power supply process of the first battery cell module and the second battery cell module, therefore, a battery management controller can also be set in the power battery, and corresponding insurance devices can be set.

[0036] In a specific implementation manner, the power battery further includes a battery management controller, a first insurance device and a second insurance device. One end of the first insurance device is connected to the low-voltage load, and the other end is connected to the first battery cell module for supplying power to the low-voltage load. One end of the second insurance device is connected to the low-voltage load, and the other end is connected to the second battery cell module for supplying power to the low-voltage load; The battery management controller disconnects the first insurance device when detecting abnormal low voltage provided by the first battery cell module, and disconnects the second insurance device when detecting abnormal low voltage provided by the second battery cell module.

[0037] Wherein, one end of the first insurance device is connected to the low-voltage load, and the other end is connected to the first battery cell module for low-voltage power supply, that is, the first insurance device is arranged between the low-voltage load and the first battery cell module responsible for low-voltage power supply. One end of the second insurance device is connected to the low-voltage load, and the other end is connected to the second battery cell module for supplying power to the low-voltage load, that is, the second insurance device is arranged between the low-voltage load and the second battery cell module responsible for low-voltage power supply.

[0038] Exemplarily, the first insurance device can be arranged at the positive extreme of the first battery cell module, and the second insurance device can be arranged at the positive extreme of the second battery cell module.

[0039] Specifically, when the low voltage output by the first battery cell module and the second battery cell module is normal, the first insurance device and the second insurance device remain closed. If the battery management controller detects that the low voltage provided by the first battery cell module is abnormal, such as low-voltage short circuit, low-voltage overcurrent or low-voltage overheating, etc., the first insurance device can be disconnected to cut off the connection between the first battery cell module and the low-voltage load; if the battery management controller detects that the low voltage provided by the second battery cell module is abnormal, such as low-voltage short circuit, low-voltage overcurrent or low-voltage overheating, etc., the second insurance device can be disconnected to cut off the connection between the second battery cell module and the low-voltage load.

[0040] Through the above battery management controller, first insurance device and second insurance device, when abnormalities such as overcurrent, short circuit or overheating occur in the low voltage, the low voltage output to the low-voltage load can be cut off in time to prevent the low-voltage circuit from interfering with the high-voltage circuit and ensure the stability of high-voltage power supply; moreover, when one of the low-voltage circuits is abnormal, it can be cut off in time, enabling the other battery cell module to continue to supply power to the low-voltage load and ensuring the normal operation of the low-voltage load.

[0041] In addition to setting the insurance device, in the embodiment of the present application, considering that high-voltage overheating and high-voltage overcurrent abnormalities may occur during the high-voltage power supply process of the first battery cell assembly and the second battery cell assembly, accordingly, a corresponding disconnect switch can also be set.

[0042] In a specific implementation manner, the power battery further includes a first disconnect switch and a second disconnect switch. The first disconnect switch is arranged between the first battery cell module for supplying power to the low-voltage load and other first battery cell modules, and the second disconnect switch is arranged between the second battery cell module for supplying power to the low-voltage load and other second battery cell modules; The battery management controller disconnects the first disconnect switch when detecting that the high voltage provided by the first battery cell assembly is abnormal, and disconnects the second disconnect switch when detecting that the high voltage provided by the second battery cell assembly is abnormal.

[0043] One end of the first isolation switch is connected to the first battery cell module that powers the low-voltage load, and the other end is connected to the next first battery cell module connected in series with the first battery cell module, that is, the first isolation switch is arranged between the first battery cell module that powers the low-voltage load and other first battery cell modules; one end of the second isolation switch is connected to the second battery cell module that powers the low-voltage load, and the other end is connected to the next second battery cell module connected in series with the second battery cell module, that is, the second isolation switch is arranged between the second battery cell module that powers the low-voltage load and other second battery cell modules.

[0044] Exemplarily, the first isolation switch can be arranged at the positive extreme of the first battery cell module that powers the low-voltage load, and the second isolation switch can be arranged at the positive extreme of the second battery cell module that powers the low-voltage load.

[0045] Specifically, when the high voltage output by the first battery cell assembly and the second battery cell assembly is normal, the first isolation device and the second isolation device remain closed. If the battery management controller detects that the high voltage provided by the first battery cell assembly is abnormal, such as high voltage overheating, high voltage overcurrent, etc., the first isolation switch can be disconnected to cut off the connection between the first battery cell module that powers the low-voltage load and other first battery cell modules; if the battery management controller detects that the high voltage provided by the second battery cell assembly is abnormal, such as high voltage overheating, high voltage overcurrent, etc., the second isolation switch can be disconnected to cut off the connection between the second battery cell module that powers the low-voltage load and other second battery cell modules.

[0046] Through the above-mentioned first isolation device and second isolation device, when an abnormality such as overcurrent or over-temperature occurs in the high voltage, the connection with the first battery cell module or the second battery cell module for low-voltage power supply can be cut off in time to prevent the high-voltage circuit from interfering with the low-voltage circuit and ensure the stability of the low-voltage power supply; moreover, when one of the high-voltage circuits is abnormal, it can be cut off in time, enabling the other battery cell assembly to continue to supply high voltage, ensuring the stability of the vehicle's high-voltage operation.

[0047] Figure 4 It is a schematic diagram of the assembly of a power battery provided by an embodiment of the present application. As Figure 4 shown, the first battery cell assembly of the power battery is composed of 58 battery cell modules connected in series, and the second battery cell assembly of the power battery is composed of 58 battery cell modules connected in series. The battery cell module 1 (i.e., the first battery cell module) of the first battery cell assembly and the battery cell module 1 (i.e., the first battery cell module) of the second battery cell assembly are responsible for low-voltage power supply.

[0048] In Figure 4 , the battery cell module 1 of the first battery cell assembly and the battery cell module 1 of the second battery cell assembly are composed of four battery cells a, b, c, and d connected in series. The voltage between A+ and A1 is 13.8V, and the voltage between B+ and B- is 13.8V, which can achieve low-voltage redundant power supply output.

[0049] Reference Figure 4 Figure 4 , the battery modules 1 of the first battery cell assembly and the battery modules 1 of the second battery cell assembly are internally integrated with Efuse fuses (i.e., the first fuse device and the second fuse device), which can be controlled by the battery management controller in the power battery. The battery module 1 of the first battery cell assembly is integrated with a disconnect switch S1 (i.e., the first disconnect switch), and the battery module 1 of the second battery cell assembly is integrated with a disconnect switch S2 (i.e., the second disconnect switch), which can be controlled by the battery management controller in the power battery.

[0050] In Figure 4 Figure 4 , the total voltage of the first battery cell assembly is 802.72V and the total power is 19.265kWh; the total voltage of the second battery cell assembly is 802.72V and the total power is 19.265kWh. When overcurrent or short circuit occurs at low voltage, the battery management controller can cut off the efuse fuse of the first battery cell assembly or the second battery cell assembly to prevent low voltage from interfering with the high-voltage assembly; when overheat or overcurrent abnormalities occur at high voltage, the battery management controller can cut off the disconnect switch S1 or the disconnect switch S2 to avoid high voltage from interfering with low voltage.

[0051] In addition, in Figure 4 Figure 4 , when the vehicle power supply is normal, the low-voltage outputs between the battery modules 1 of the first battery cell assembly and the battery modules 1 of the second battery cell assembly are connected in parallel to maintain voltage balance. The first battery cell assembly and the second battery cell assembly are connected in parallel to maintain the power balance inside the battery cell assembly. The voltage between V+ and V- is 802.72V, and the total power of the power battery is 38.53kwh, realizing the high-voltage power supply for the whole vehicle. Fuses can also be set at V+. In case of overcurrent, short circuit, etc. in the circuit, the circuit can be cut off by fusing itself to avoid damaging the equipment.

[0052] In the above power battery assembly structure, by designing fault isolation between the battery modules with low-voltage power supply and other battery modules, the influence of abnormalities in other battery modules on the low-voltage output can be avoided; moreover, in the structural design process of the two battery cell assemblies, adding fault isolation can prevent the influence of thermal diffusion or other abnormalities on each other.

[0053] It should be noted that the above power battery assembly can be adjusted according to the power demand of the whole vehicle, by increasing the number of battery modules or adjusting the power of the battery cells, to ensure the low-voltage output and fault isolation of the dual-battery-cell assembly of 12V~14V.

[0054] In the embodiment of the present application, in order to achieve redundant control of the dual-channel high-voltage power supply, two controllers can also be set, and the high-voltage power supply redundancy is realized by the dual controllers.

[0055] In a specific embodiment, the power battery further includes a first controller, a second controller, two first output control switches, and two second output control switches; The two first output control switches are disposed at the positive and negative terminals of the first battery cell assembly, and the two second output control switches are disposed at the positive and negative terminals of the second battery cell assembly; The first controller disconnects the first output control switches when detecting that the vehicle stops high-voltage power supply; The second controller disconnects the second output control switches when detecting that the vehicle stops high-voltage power supply.

[0056] Wherein, the two first output control switches can be respectively disposed at the positive terminal and the negative terminal of the first battery cell assembly to respectively control the high-voltage output of the positive terminal and the negative terminal, and the two second output control switches can be respectively disposed at the positive terminal and the negative terminal of the second battery cell assembly to respectively control the high-voltage output of the positive terminal and the negative terminal.

[0057] The first output control switches and the second output control switches can adopt IGBT (Insulated Gate Bipolar Transistor) or SiC (Silicon Carbide) power semiconductor devices.

[0058] Specifically, when the first controller detects normal high-voltage power supply of the vehicle, it can keep all the first output control switches closed, and when the second controller detects normal high-voltage power supply of the vehicle, it can keep all the second output control switches closed.

[0059] Moreover, when the first controller detects that the vehicle stops high-voltage power supply, it can disconnect all the first output control switches, and when the second controller detects that the vehicle stops high-voltage power supply, it can disconnect all the second output control switches to cut off the high-voltage electricity, so that the power battery only performs low-voltage power supply.

[0060] In the embodiment of the present application, the first controller and the second controller can also detect abnormal high-voltage power supply, and timely cut off the corresponding output control switches in case of abnormality, and supply high-voltage power by another battery cell assembly.

[0061] In an example, the first controller cuts off the first output control switches when detecting abnormal high-voltage power supply of the first battery cell assembly, and cuts off the second output control switches when detecting abnormal high-voltage power supply of the second battery cell assembly.

[0062] Among them, the first controller can detect whether the high-voltage power supplied by the first battery cell assembly is abnormal. If the high-voltage power supply of the first battery cell assembly is abnormal, such as high-voltage overcurrent, high-voltage over-temperature, etc., all the first output control switches can be cut off, and the second battery cell assembly is responsible for high-voltage power supply.

[0063] Moreover, the second controller can detect whether the high-voltage power supplied by the second battery cell assembly is abnormal. If the high-voltage power supply of the second battery cell assembly is abnormal, such as high-voltage overcurrent, high-voltage over-temperature, etc., all the second output control switches can be cut off, and the first battery cell assembly is responsible for high-voltage power supply.

[0064] Through the above example, when an abnormality occurs in one of the high-voltage circuits, the high-voltage output can be cut off in time, and the other high-voltage circuit supplies power, ensuring the stability of the vehicle's high-voltage operation.

[0065] In the embodiment of the present application, in order to maintain the balance of the high-voltage voltage, the first battery cell assembly and the second battery cell assembly can also be connected in parallel.

[0066] Optionally, the first battery cell assembly and the second battery cell assembly are connected in parallel.

[0067] Among them, through the parallel connection between the first battery cell assembly and the second battery cell assembly, the voltage balance can be maintained between the first battery cell assembly and the second battery cell assembly, further ensuring the stability of the high-voltage power supply.

[0068] In the embodiment of the present application, when detecting an abnormality in the high-voltage power supply, in addition to disconnecting the corresponding output control switch, a parallel control switch can also be set, and the corresponding parallel control switch is cut off together to achieve the purpose of fault isolation.

[0069] In some embodiments, the power battery further includes two first parallel control switches and two second parallel control switches. The first parallel control switch and the second parallel control switch are arranged between the first battery cell assembly and the second battery cell assembly; The first controller cuts off the first parallel control switch when detecting that the high-voltage power supply of the first battery cell assembly is abnormal; The second controller cuts off the second parallel control switch when detecting that the high-voltage power supply of the second battery cell assembly is abnormal.

[0070] Among them, the two first parallel control switches can be respectively arranged at the positive and negative ports of the first battery cell assembly to control the parallel connection with the second battery cell assembly; the two second parallel control switches can be respectively arranged at the positive and negative ports of the second battery cell assembly to control the parallel connection with the first battery cell assembly.

[0071] The first output control switch and the second output control switch can adopt IGBT (Insulated Gate Bipolar Transistor) or SiC (Silicon Carbide) power semiconductor devices.

[0072] Specifically, when the first controller detects normal high-voltage power supply of the vehicle, it can keep all the first parallel control switches closed. When the second controller detects normal high-voltage power supply of the vehicle, it can keep all the second parallel control switches closed.

[0073] Moreover, when the second controller detects abnormal high-voltage power supply of the first battery cell assembly, it can disconnect all the first parallel control switches. And when the second controller detects abnormal high-voltage power supply of the second battery cell assembly, it can disconnect all the second parallel control switches to achieve fault isolation between the two battery cell assemblies.

[0074] Through the above implementation manners, when the first battery cell assembly or the second battery cell assembly is abnormal, the corresponding parallel control switch can be cut off to achieve fault isolation, and prevent the abnormal high-voltage circuit from affecting the operation of the other battery cell assembly.

[0075] In addition to the control of fault isolation during high-voltage abnormality, the first controller and the second controller can also perform fault isolation when the other controller is abnormal.

[0076] Optionally, the first controller cuts off the first parallel control switch when detecting the loss or abnormal operation of the second controller node; The second controller cuts off the second parallel control switch when detecting the loss or abnormal operation of the first controller node.

[0077] Among them, the first controller and the second controller can communicate with each other to transmit signals at a set period. If the first controller does not receive the signal of the second controller within the time corresponding to the set period, or the signal received from the second controller is abnormal, it can be determined that the loss of the second controller node is detected, and then the first parallel control switch can be cut off to isolate the second battery cell assembly from the first battery cell assembly. And if the first controller detects abnormal operation of the second controller, such as the second controller sending an abnormal signal, the first parallel control switch can be cut off to isolate the second battery cell assembly from the first battery cell assembly.

[0078] In addition, if the second controller does not receive the signal from the first controller within the time corresponding to the set period, or if the signal received from the first controller is abnormal, it can be determined that the first controller node is lost, and then the second parallel control switch can be cut off to isolate the first battery cell assembly from the second battery cell assembly. Moreover, if the second controller detects that the first controller is operating abnormally, such as the first controller sending an abnormal signal, the second parallel control switch can be cut off to isolate the first battery cell assembly from the second battery cell assembly.

[0079] Through the above implementation, when one of the controllers fails, the parallel connection between the two battery cell assemblies can be cut off in a timely manner to achieve the purpose of fault isolation, thereby ensuring the normal output of the other battery cell assembly and further ensuring the power supply stability of the other battery cell assembly.

[0080] Exemplarily, Figure 5 is a schematic diagram of a dual-controller of a power battery assembly provided by an embodiment of the present application. As Figure 5 shown, the power battery assembly may include BMS1 (i.e., the first controller) and BMS2 (i.e., the second controller). BMS1 is connected to control switches x1, x2, x3, and x4, and BMS2 is connected to control switches y1, y2, y3, and y4. Among them, control switches x1 and x2 are the first output control switches, control switches x3 and x4 are the first parallel control switches, control switches y1 and y2 are the second output control switches, and control switches y3 and y4 are the second parallel control switches.

[0081] In Figure 5 , the total voltage between V1+ and V1- of the first battery cell assembly is 802.72V; the total voltage between V2+ and V2- of the second battery cell assembly is 802.72V. BMS1 can control control switches x1, x2, x3, and x4. X1 and x2 control the high-voltage output of V1+ and V1-, and x3 and x4 control the parallel connection with the second battery cell assembly and fault isolation. BMS2 can control control switches y1, y2, y3, and y4. Y1 and y2 control the high-voltage output of V2+ and V2-, and y3 and y4 control the parallel connection with the first battery cell assembly and fault isolation. When the power battery is working normally, x1, x2, x3, x4, y1, y2, y3, and y4 are all kept closed, and the first battery cell assembly and the second battery cell assembly are in parallel to supply power to the vehicle high-voltage electrical appliances. When the vehicle stops high-voltage power supply, x1, x2, y1, and y2 are cut off, and x3, x4, y3, and y4 are kept closed, and the power battery only supplies low-voltage power.

[0082] Moreover, when BMS1 detects an abnormality in the first battery cell assembly, it stops the high-voltage output of the first battery cell assembly and cuts off the control switches x1, x2, x3, and x4 to prevent the failure from affecting the operation of the second battery cell assembly. When BMS2 detects an abnormality in the second battery cell assembly, it stops the high-voltage output of the second battery cell assembly and cuts off the control switches y1, y2, y3, and y4 to prevent the failure from affecting the operation of the first battery cell assembly.

[0083] When BMS1 detects the loss or abnormal operation of the BMS2 node, BMS1 actively controls the cutting-off of x3 and x4 for fault isolation and maintains the normal output of the first battery cell assembly; when BMS2 detects the loss or abnormal operation of the BMS1 node, BMS2 actively controls the cutting-off of y3 and y4 for fault isolation and maintains the normal output of the second battery cell assembly.

[0084] The power battery of the vehicle provided by the embodiment of the present application is composed of a first battery cell assembly and a second battery cell assembly. The first battery cell assembly includes a plurality of first battery cell modules connected in series, and the second battery cell assembly includes a plurality of second battery cell modules connected in series. One first battery cell module in the first battery cell assembly and one second battery cell module in the second battery cell assembly supply power to the low-voltage load of the vehicle, and the first battery cell assembly and the second battery cell assembly supply high-voltage power to the vehicle, realizing redundant high- and low-voltage power supply for the vehicle. There is no need to install a DCDC controller, a storage battery, and storage battery-related sensor components in the vehicle, which not only meets the power supply requirements of high-order intelligent driving and by-wire chassis, but also reduces the vehicle development cost and maintenance cost, reduces the vehicle body weight, and achieves the goal of lifetime maintenance-free of the low-voltage storage battery.

[0085] Figure 6 It is a schematic structural diagram of an electronic device provided by the embodiment of the present application, which is applicable to a battery management controller, a first controller, and a second controller. As Figure 6 shown, the electronic device 400 includes one or more processors 401 and a memory 402.

[0086] The processor 401 may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.

[0087] The memory 402 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage media, and the processor 401 may run the program instructions to implement the control steps described above and / or other desired functions. Various contents such as initial extrinsic parameters, thresholds, etc. may also be stored in the computer-readable storage media.

[0088] In one example, the electronic device 400 may further include: an input device 403 and an output device 404, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown). The input device 403 may include, for example, a keyboard, a mouse, etc. The output device 404 may output various information to the outside, including warning prompt information, braking force, etc. The output device 404 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0089] Of course, for simplicity, Figure 4 only some of the components related to the present application in the electronic device 400 are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, according to specific application scenarios, the electronic device 400 may further include any other appropriate components.

[0090] For the same purpose, an embodiment of the present application also provides a vehicle, which includes the power battery provided in any embodiment of the present application.

[0091] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above are only the preferred implementation manners of the present application. It should be noted that due to the limited nature of literal expression and the objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements, modifications or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A power battery for a vehicle, characterized in that, The power battery includes a first battery cell assembly and a second battery cell assembly. The first battery cell assembly includes a plurality of first battery cell modules connected in series, and the second battery cell assembly includes a plurality of second battery cell modules connected in series; One first battery cell module in the first battery cell assembly and one second battery cell module in the second battery cell assembly supply power to the low-voltage load of the vehicle; The first battery cell assembly and the second battery cell assembly supply high-voltage power to the vehicle.

2. The power battery according to claim 1, wherein, The power battery further includes a battery management controller, a first fuse device and a second fuse device. One end of the first fuse device is connected to the low-voltage load, and the other end is connected to the first battery cell module that supplies power to the low-voltage load. One end of the second fuse device is connected to the low-voltage load, and the other end is connected to the second battery cell module that supplies power to the low-voltage load; The battery management controller disconnects the first fuse device when detecting that the low voltage provided by the first battery cell module is abnormal, and disconnects the second fuse device when detecting that the low voltage provided by the second battery cell module is abnormal.

3. The power battery according to claim 2, characterized in that The power battery further includes a first disconnect switch and a second disconnect switch. The first disconnect switch is arranged between the first battery cell module that supplies power to the low-voltage load and other first battery cell modules, and the second disconnect switch is arranged between the second battery cell module that supplies power to the low-voltage load and other second battery cell modules; The battery management controller disconnects the first disconnect switch when detecting that the high voltage provided by the first battery cell assembly is abnormal, and disconnects the second disconnect switch when detecting that the high voltage provided by the second battery cell assembly is abnormal.

4. The power battery according to claim 1, characterized in that The power battery further includes a first controller, a second controller, two first output control switches and two second output control switches; The two first output control switches are arranged at the positive and negative terminals of the first battery cell assembly, and the two second output control switches are arranged at the positive and negative terminals of the second battery cell assembly; The first controller disconnects the first output control switch when detecting that the vehicle stops high-voltage power supply; The second controller disconnects the second output control switch when detecting that the vehicle stops high-voltage power supply.

5. The power battery according to claim 4, characterized in that The first controller cuts off the first output control switch when detecting that the high-voltage power supply of the first battery cell assembly is abnormal, and cuts off the second output control switch when detecting that the high-voltage power supply of the second battery cell assembly is abnormal.

6. The power battery according to claim 5, wherein, The first battery cell assembly and the second battery cell assembly are connected in parallel.

7. The power battery according to claim 6, wherein, The power battery further includes two first parallel control switches and two second parallel control switches. The first parallel control switches and the second parallel control switches are arranged between the first battery cell assembly and the second battery cell assembly; The first controller cuts off the first parallel control switch when detecting that the high-voltage power supply of the first battery cell assembly is abnormal; The second controller cuts off the second parallel control switch when detecting that the high-voltage power supply of the second battery cell assembly is abnormal.

8. The power battery according to claim 7, characterized in that, The first controller cuts off the first parallel control switch when detecting that the second controller node is lost or malfunctioning. The second controller cuts off the second parallel control switch when detecting that the first controller node is lost or malfunctioning.

9. The power battery according to claim 1, wherein The first battery cell module and the second battery cell module that supply power to the low-voltage load are connected in parallel.

10. A vehicle, characterized in that, The vehicle includes the power battery according to any one of claims 1 to 9.

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