Hybrid battery system

Abstract

The utility model provides a hybrid battery system. The hybrid battery system comprises a battery management unit, a battery disconnection unit, a first sodium ion battery module, a second sodium ion battery module, a first lithium ion battery module, a second lithium ion battery module, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor and a load unit. Through the hybrid battery system, the two sodium-ion battery modules and the two lithium-ion battery modules work in a hybrid manner under a normal working condition, and power is supplied only through the sodium-ion battery modules under a high-temperature or low-temperature working condition. Therefore, the adaptive capacity of the hybrid battery system under high and low temperature working conditions is improved, the hybrid battery system can normally work in a high-temperature environment and a low-temperature environment, the cruising ability in the low-temperature environment is improved, and meanwhile the problems of battery safety and comfort in the high-temperature environment are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile battery, in particular to a hybrid battery system. BACKGROUND

[0002] With the increasing demand for battery performance in electric vehicles and energy storage systems, sodium-ion batteries, as a new energy storage technology, are increasingly attracting attention in the industry. Due to the abundant raw materials, low cost and excellent cycle life of sodium-ion batteries, they have shown great potential for development in various application scenarios. In particular, it is worth mentioning that the performance of sodium-ion batteries under extreme temperature conditions is particularly outstanding. In contrast, the performance of lithium-ion batteries is relatively poor in low-temperature and high-temperature environments.

[0003] Under normal circumstances, sodium-ion batteries and lithium-ion batteries are often used in series and adopt the same thermal management strategy. However, this approach does not fully exploit the unique advantages of sodium-ion batteries in low-temperature and high-temperature environments. For example, in a low-temperature environment, if the temperature of the lithium-ion battery is too low, the system will usually prevent it from charging. Similarly, in the case of high battery temperature, the entire battery pack will be prohibited from discharging. This means that, in a low-temperature condition, to ensure that the lithium-ion battery can reach a normal operating temperature, the system must first activate the heating device to preheat the lithium-ion battery, during which the electric vehicle cannot be started. In a high-temperature condition, when the battery temperature is too high, the battery pack cannot provide power to the vehicle, and the air conditioning system also cannot operate due to the high temperature, thereby affecting the comfort experience of passengers. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a hybrid battery system, which works with two sodium-ion battery modules and two lithium-ion battery modules under normal conditions, and only uses sodium-ion battery modules to supply power under high-temperature or low-temperature conditions. This improves the adaptability of the hybrid battery system under high-temperature and low-temperature conditions, allowing the hybrid battery system to work normally in high-temperature and low-temperature environments, improving the endurance in low-temperature environments, and solving the problems of battery safety and comfort in high-temperature environments.

[0005] In a first aspect, the present application provides a hybrid battery system, which includes a battery management unit, a battery disconnect unit, a first sodium-ion battery module, a second sodium-ion battery module, a first lithium-ion battery module, a second lithium-ion battery module, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, and a load unit.

[0006] One end of the first sodium-ion battery module is electrically connected with the load unit, and the other end of the first sodium-ion battery module is electrically connected with one end of the first contactor and one end of the second contactor respectively;

[0007] One end of the first lithium-ion battery module is electrically connected with the other end of the first contactor, one end of the fifth contactor is electrically connected with the other end of the first lithium-ion battery module, and the other end of the fifth contactor is electrically connected with the other end of the second contactor and one end of the second sodium-ion battery module respectively; the other end of the second sodium-ion battery module is electrically connected with one end of the third contactor and one end of the fourth contactor respectively;

[0008] One end of the second lithium-ion battery module is electrically connected with the other end of the fourth contactor, and the other end of the second lithium-ion battery module and the other end of the third contactor are electrically connected with the load unit respectively;

[0009] The battery management unit is connected with the battery disconnect unit, the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module and the second lithium-ion battery module;

[0010] The battery disconnect unit is connected with the first contactor, the second contactor, the third contactor, the fourth contactor and the fifth contactor.

[0011] Further, in the sodium battery and lithium battery mixed working mode, the first contactor, the fourth contactor and the fifth contactor are all closed, the second contactor and the third contactor are all disconnected, and the first sodium-ion battery module, the first lithium-ion battery module, the second sodium-ion battery module and the second lithium-ion battery module work in series.

[0012] Further, in the sodium battery working mode, the second contactor and the third contactor are both closed, and the first contactor, the fourth contactor and the fifth contactor are all disconnected, and the first sodium-ion battery module and the second sodium-ion battery module work in series.

[0013] Further, the hybrid battery system further comprises a temperature detection unit, the temperature detection unit is connected with the battery management unit, and the temperature detection unit detects the temperature of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module and the second lithium-ion battery module.

[0014] Further, the hybrid battery system further comprises a voltage sensor connected to the battery management unit, the voltage sensor detecting the voltage of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module and the second lithium-ion battery module.

[0015] Further, the hybrid battery system further comprises a current sensor connected to the battery management unit, the current sensor detecting the current of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module and the second lithium-ion battery module.

[0016] Further, the hybrid battery system further comprises a DC-DC module, an input positive electrode of the DC-DC module being electrically connected to the positive electrode of the first sodium-ion battery module, an input negative electrode of the DC-DC module being electrically connected to one end of the third contactor and the negative electrode of the second lithium-ion battery module respectively;

[0017] An output positive electrode and an output negative electrode of the DC-DC module are electrically connected to the load unit respectively.

[0018] Further, the hybrid battery system further comprises a display unit connected to the battery management unit, the display unit displaying the state information of the first sodium-ion battery module, the first lithium-ion battery module, the second sodium-ion battery module and the second lithium-ion battery module.

[0019] Further, the hybrid battery system further comprises a communication unit, one end of the communication unit being connected to the battery management unit, the other end of the communication unit being connected to an external device, so as to transmit the state information of the first sodium-ion battery module, the first lithium-ion battery module, the second sodium-ion battery module and the second lithium-ion battery module to the external device through the communication unit.

[0020] The hybrid battery system provided by the embodiment of the present application comprises a battery management unit, a battery disconnect unit, a first sodium ion battery module, a second sodium ion battery module, a first lithium ion battery module, a second lithium ion battery module, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor and a load unit; one end of the first sodium ion battery module is electrically connected with the load unit, and the other end of the first sodium ion battery module is electrically connected with one end of the first contactor and one end of the second contactor respectively; one end of the first lithium ion battery module is electrically connected with the other end of the first contactor, one end of the fifth contactor is electrically connected with the other end of the first lithium ion battery module, and the other end of the fifth contactor is electrically connected with the other end of the second contactor and one end of the second sodium ion battery module respectively; the other end of the second sodium ion battery module is electrically connected with one end of the third contactor and one end of the fourth contactor respectively; one end of the second lithium ion battery module is electrically connected with the other end of the fourth contactor, and the other end of the second lithium ion battery module and the other end of the third contactor are electrically connected with the load unit respectively; the battery management unit is connected with the battery disconnect unit, the first sodium ion battery module, the second sodium ion battery module, the first lithium ion battery module and the second lithium ion battery module; and the battery disconnect unit is connected with the first contactor, the second contactor, the third contactor, the fourth contactor and the fifth contactor.

[0021] The battery disconnect unit of the present application controls the on and off of each contactor through the instruction of the battery management unit, can independently turn on and off the two sodium ion battery modules and the two lithium ion battery modules respectively, thereby realizing the mixed working of the two sodium ion battery modules and the two lithium ion battery modules under normal working conditions and realizing the power supply through only the sodium ion battery module under high-temperature or low-temperature working conditions. Thus, the adaptability of the hybrid battery system under high-temperature and low-temperature working conditions is improved, the hybrid battery system can work normally under high-temperature and low-temperature environments, the endurance under low-temperature environment is improved, and the problems of battery safety and comfort under high-temperature environment are solved.

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A structural schematic diagram of a hybrid battery system provided by an embodiment of the present application;

[0025] Figure 2 A structural schematic diagram of a hybrid battery system in a sodium and lithium hybrid working mode provided by an embodiment of the present application;

[0026] Figure 3 A structural schematic diagram of a hybrid battery system in a sodium working mode provided by an embodiment of the present application;

[0027] Figure 4 A structural schematic diagram of a hybrid battery system provided by an embodiment of the present application;

[0028] Main component symbol explanation:

[0029] Icon: 1-hybrid battery system; 10-battery management unit; 20-battery disconnect unit; 30-first sodium ion battery module; 40-second sodium ion battery module; 50-first lithium ion battery module; 60-second lithium ion battery module; 70-first contactor; 80-second contactor; 90-third contactor; 100-fourth contactor; 110-fifth contactor; 120-load unit; 130-temperature detection unit; 140-voltage sensor; 150-current sensor; 160-DC-DC module; 170-display unit; 180-communication unit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, every other embodiment obtained by a person skilled in the art without creative work belongs to the scope of protection of the present application.

[0031] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "communicate", "connect" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In order to enable those skilled in the art to use the content of the present application, the following embodiments are given in combination with a specific application scenario "automobile battery technology field", and those skilled in the art can apply the general principles defined herein to other embodiments and application scenarios without departing from the spirit and scope of the present application.

[0035] The methods, devices, electronic devices or computer readable storage media described in the embodiments of the present application can be applied to any scene requiring automobile batteries, and the embodiments of the present application do not limit the specific application scenario, and any use of the scheme of the hybrid battery system provided in the embodiments of the present application is within the protection scope of the present application.

[0036] With the increasing demand for battery performance in electric vehicles and energy storage systems, sodium-ion batteries, as a new energy storage technology, are increasingly attracting attention in the industry. Due to the abundant raw materials, low cost and excellent cycle life of sodium-ion batteries, they have shown great potential in various application scenarios. In particular, it is worth mentioning that sodium-ion batteries perform exceptionally well in extreme temperature conditions. In contrast, lithium-ion batteries perform poorly in low and high temperature environments.

[0037] Research has found that sodium-ion batteries and lithium-ion batteries are often used in series and use the same thermal management strategy. However, this approach does not fully exploit the unique advantages of sodium-ion batteries in low and high temperature environments. For example, in a low temperature environment, if the temperature of the lithium-ion battery is too low, the system will usually prevent it from charging. Similarly, in the case of high battery temperature, the entire battery pack will be prohibited from discharging. This means that in low temperature conditions, to ensure that the lithium-ion battery can reach the normal operating temperature, the system must first activate the heating device to preheat the lithium-ion battery, during which the electric vehicle cannot start. In high temperature conditions, when the battery temperature is too high, the battery pack cannot provide power to the vehicle, and the air conditioning system cannot operate due to the high temperature, affecting the comfort of passengers.

[0038] In order to facilitate the understanding of the present application, the technical solutions provided by the present application will be described in detail below in conjunction with specific embodiments.

[0039] Please refer to Figure 1 , Figure 1 A structure diagram of a hybrid battery system provided by an embodiment of the present application. As shown in Figure 1 , the hybrid battery system 1 provided by the embodiment of the present application includes a battery management unit 10, a battery disconnect unit 20, a first sodium-ion battery module 30, a second sodium-ion battery module 40, a first lithium-ion battery module 50, a second lithium-ion battery module 60, a first contactor 70, a second contactor 80, a third contactor 90, a fourth contactor 100, a fifth contactor 110 and a load unit 120.

[0040] Here, the battery management unit 10 is a BMS (Battery Management Unit) unit in an electric vehicle, responsible for real-time monitoring of parameters such as voltage, current, temperature, etc. of each battery module, ensuring the health of the battery. The battery disconnect unit 20 is a BDU (Battery Disconnect Unit) unit, which can control the on and off of each contactor according to the instructions of the battery management unit 10, to control the on and off of each battery module. The contactor is a controllable switch. The load unit 120 can be a motor, electronic equipment or other equipment that requires power level in the electric vehicle.

[0041] One end of the first sodium-ion battery module 30 is electrically connected to the load unit 120, and the other end of the first sodium-ion battery module 30 is electrically connected to one end of the first contactor 70 and one end of the second contactor 80, respectively.

[0042] One end of the first lithium-ion battery module 50 is electrically connected to the other end of the first contactor 70, one end of the fifth contactor 110 is electrically connected to the other end of the first lithium-ion battery module 50, and the other end of the fifth contactor 110 is electrically connected to the other end of the second contactor 80 and one end of the second sodium-ion battery module 40, respectively; the other end of the second sodium-ion battery module 40 is electrically connected to one end of the third contactor 90 and one end of the fourth contactor 100, respectively.

[0043] One end of the second lithium-ion battery module 60 is electrically connected to the other end of the fourth contactor 100, and the other end of the second lithium-ion battery module 60 and the other end of the third contactor 90 are electrically connected to the load unit 120, respectively.

[0044] The battery management unit 10 is connected to the battery disconnect unit 20, the first sodium-ion battery module 30, the second sodium-ion battery module 40, the first lithium-ion battery module 50, and the second lithium-ion battery module 60.

[0045] The battery disconnect unit 20 is connected to the first contactor 70, the second contactor 80, the third contactor 90, the fourth contactor 100, and the fifth contactor 110.

[0046] Thus, according to the embodiments provided in the present application, the hybrid battery system 1 mainly consists of two sodium-ion battery modules, two lithium-ion battery modules, five contactors, a battery management unit 10 and a battery disconnect unit 20. The battery disconnect unit 20 controls the on and off of each contactor through the instruction of the battery management unit 10, and can independently turn on and off the two sodium-ion battery modules and the two lithium-ion battery modules, so as to realize the mixed working of the two sodium-ion battery modules and the two lithium-ion battery modules under normal working conditions, and realize the power supply only through the sodium-ion battery module under high-temperature or low-temperature working conditions. Thus, the adaptability of the hybrid battery system under high-temperature and low-temperature working conditions is improved, the hybrid battery system can work normally under high-temperature and low-temperature environments, the endurance capability under low-temperature environment is improved, and the problems of battery safety and comfort under high-temperature environment are solved.

[0047] Specifically, please refer to Figure 2 , Figure 2 is a structural schematic diagram of a hybrid battery system in a sodium battery and lithium battery mixed working mode provided by the embodiments of the present application. In the sodium battery and lithium battery mixed working mode, the first contactor 70, the fourth contactor 100 and the fifth contactor 110 are closed, the second contactor 80 and the third contactor 90 are opened, and the first sodium-ion battery module 30, the first lithium-ion battery module 50, the second sodium-ion battery module 40 and the second lithium-ion battery module 60 work in series.

[0048] Here, the sodium battery and lithium battery mixed working mode refers to that the battery temperature is within a first preset temperature range, for example, the first preset temperature range can be 0-55℃, which is not limited in the present application. The battery management unit 10 monitors the battery temperature of the hybrid battery system in real time, and when in the sodium battery and lithium battery mixed working mode, the battery management unit 10 sends corresponding instructions to the battery disconnect unit 20, and the battery disconnect unit 20 controls the first contactor 70, the fourth contactor 100 and the fifth contactor 110 to be closed according to the instructions, and controls the second contactor 80 and the third contactor 90 to be opened, so that all the battery modules work, the first sodium-ion battery module 30, the first lithium-ion battery module 50, the second sodium-ion battery module 40 and the second lithium-ion battery module 60 work in series, and the overall performance of the hybrid battery system 1 is improved.

[0049] Specifically, please refer to Figure 3 , Figure 3A structure schematic diagram of a hybrid battery system in a sodium electric working mode is provided in the embodiments of the present application. In the sodium electric working mode, the second contactor 80 and the third contactor 90 are both closed, and the first contactor 70, the fourth contactor 100 and the fifth contactor 110 are all disconnected, and the first sodium ion battery module 30 and the second sodium ion battery module 40 work in series.

[0050] Here, the sodium electric working mode refers to power supply only through sodium ion battery modules. Specifically, according to the embodiments provided in the present application, when in a low-temperature working condition, a high-temperature working condition and a sodium battery charging and discharging working condition, the sodium electric working mode is adopted. The battery management unit 10 monitors the battery temperature of the hybrid battery system in real time. When it is detected that the battery temperature is in a second preset temperature range, for example, the second preset temperature range is -40℃-0℃, it is considered to be in the sodium electric working mode; when it is detected that the battery temperature is in a third preset temperature range, for example, the third preset temperature range is greater than 55℃ and less than 80℃, it is considered to be in the sodium electric working mode. The battery management unit 10 can also charge and discharge the sodium ion battery module alone by detecting the capacity difference between the sodium ion battery module and the lithium ion battery module, i.e., the sodium battery charging and discharging working condition, so as to ensure the capacity consistency of each sodium ion battery module and each lithium ion battery module.

[0051] When in the sodium electric working mode, the battery management unit 10 sends corresponding instructions to the battery disconnect unit 20, and the battery disconnect unit 20 controls the second contactor 80 and the third contactor 90 to be closed according to the instructions, controls the first contactor 70, the fourth contactor 100 and the fifth contactor 110 to be disconnected, so that the first sodium ion battery module 30 and the second sodium ion battery module 40 work in series. In this way, in the low-temperature working condition, the hybrid battery system is only in the sodium ion battery working state, and can be immediately powered normally, and the driver can drive the car without waiting after starting the car. In the high-temperature working condition, the same control strategy as above is adopted, and the sodium ion battery power supply state is switched, so as to avoid the possible safety hazard of the lithium ion battery at high temperature. The electric vehicle can be normally used even if the cooling system does not work when in the high-temperature state. When the remaining capacities of the sodium battery and the lithium battery are different, only the sodium ion battery is connected, and the sodium ion battery is charged alone, so as to ensure the capacity balance between the two battery modules.

[0052] Further, please refer to Figure 4 , Figure 4 A structure schematic diagram of a hybrid battery system is provided in the embodiments of the present application. As shown in FIG. 2, the hybrid battery system comprises a battery management unit 10, a battery disconnect unit 20, a first sodium ion battery module 30, a second sodium ion battery module 40, a first lithium ion battery module 50, a second lithium ion battery module 60, a first contactor 70, a second contactor 80, a third contactor 90, a fourth contactor 100 and a fifth contactor 110. Figure 4As shown, the hybrid battery system 1 further comprises a temperature detection unit 130 connected to the battery management unit 10. The temperature detection unit 130 is configured to detect the temperature of the first sodium-ion battery module 30, the second sodium-ion battery module 40, the first lithium-ion battery module 50 and the second lithium-ion battery module 60. The temperature detection unit 130 sends the detected temperature values to the battery management unit 10. According to the embodiments provided in the present application, the battery management unit 10 determines the working state of the hybrid battery system 1 based on the temperature values collected by the temperature detection unit 130.

[0053] The temperature detection unit 130 can comprise a plurality of temperature sensors, each of which corresponds to one or more battery modules. The temperature sensors can be connected to the central processing module of the temperature detection unit 130 through wires or connected to the temperature detection unit 130 through wireless communication. The central processing module of the temperature detection unit 130 is responsible for collecting data from each temperature sensor and sending it to the battery management unit 10. Specifically, the temperature detection unit 130 can collect temperature data of each battery module in turn through time division multiplexing. For example, the temperature detection unit 130 can read the data of each temperature sensor in turn, and then transmit these data to the battery management unit 10 through the connection line or wireless manner for processing and analysis.

[0054] Further, as shown in Figure 4 The hybrid battery system 1 further comprises a voltage sensor 140 connected to the battery management unit 10. The voltage sensor 140 detects the voltage of the first sodium-ion battery module 30, the second sodium-ion battery module 40, the first lithium-ion battery module 50 and the second lithium-ion battery module 60.

[0055] Further, as shown in Figure 4 The hybrid battery system further comprises a current sensor 150 connected to the battery management unit 10. The current sensor 150 detects the current of the first sodium-ion battery module 30, the second sodium-ion battery module 40, the first lithium-ion battery module 50 and the second lithium-ion battery module 60.

[0056] Here, the voltage sensor 140 can employ a high-precision voltage measurement chip to measure the voltage signals of the plurality of battery modules. The output signals of the voltage sensor 140 can be transmitted to the battery management unit 10 through an analog or digital interface, and the battery management unit 10 estimates the capacity of each battery module according to the voltage change. The current sensor 150 can measure the current of each battery module through the Hall effect or other means. The output signals of the current sensor 150 can be transmitted to the battery management unit 10 through an analog or digital interface, and the battery management unit 10 estimates the charge and discharge capacity of each battery module by integrating the change in current.

[0057] Further, referring to Figure 4 , the hybrid battery system 1 further comprises a DC-DC module 160, the input positive electrode of the DC-DC module 160 is electrically connected to the positive electrode of the first sodium ion battery module 30, and the input negative electrode of the DC-DC module 160 is electrically connected to one end of the third contactor 90 and the negative electrode of the second lithium ion battery module 60, respectively.

[0058] The output positive electrode and the output negative electrode of the DC-DC module 160 are electrically connected to the load unit 120, respectively.

[0059] Here, the input positive electrode (Vin+) and the input negative electrode (Vin-) of the DC-DC module 160 are used to connect the battery modules, and the DC-DC converter module converts the voltage of the input power source into the required output voltage through the internal circuit. The output positive electrode (Vout+) and the output negative electrode (Vout-) are used to connect the load unit 120. The DC-DC module 160 converts the voltage of the input power source into the required output voltage through the internal circuit and provides it to the load unit 120. The DC-DC module 160 can effectively convert one DC voltage source into another DC output with a different voltage level.

[0060] Further, referring to Figure 4 , the hybrid battery system further comprises a display unit 170, the display unit 170 is connected to the battery management unit 10, and the display unit 170 displays the state information of the first sodium ion battery module 30, the first lithium ion battery module 50, the second sodium ion battery module 40 and the second lithium ion battery module 60.

[0061] Here, the battery management unit 10 sends the monitored state information of each battery module to the display unit 170, and the display unit 170 is used to display these state information.

[0062] Further, referring to ​The hybrid battery system further includes a communication unit 180 connected to the battery management unit 10 at one end and connected to an external device at the other end to transmit the state information of the first sodium-ion battery module 30, the first lithium-ion battery module 50, the second sodium-ion battery module 40, and the second lithium-ion battery module 60 to the external device through the communication unit 180.

[0063] Here, the battery management unit 10 sends the monitored state information of each battery module to the communication unit 180, and the communication unit 180 transmits the state information of the first sodium-ion battery module 30, the first lithium-ion battery module 50, the second sodium-ion battery module 40, and the second lithium-ion battery module 60 to the external device connected thereto.

[0064] The hybrid battery system provided in the present application includes a battery management unit, a battery disconnect unit, a first sodium-ion battery module, a second sodium-ion battery module, a first lithium-ion battery module, a second lithium-ion battery module, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, and a load unit. One end of the first sodium-ion battery module is electrically connected to the load unit, and the other end of the first sodium-ion battery module is electrically connected to one end of the first contactor and one end of the second contactor, respectively. One end of the first lithium-ion battery module is electrically connected to the other end of the first contactor, one end of the fifth contactor is electrically connected to the other end of the first lithium-ion battery module, and the other end of the fifth contactor is electrically connected to the other end of the second contactor and one end of the second sodium-ion battery module, respectively. The other end of the second sodium-ion battery module is electrically connected to one end of the third contactor and one end of the fourth contactor, respectively. One end of the second lithium-ion battery module is electrically connected to the other end of the fourth contactor, and the other end of the second lithium-ion battery module and the other end of the third contactor are electrically connected to the load unit, respectively. The battery management unit is connected to the battery disconnect unit, the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module, and the second lithium-ion battery module. The battery disconnect unit is connected to the first contactor, the second contactor, the third contactor, the fourth contactor, and the fifth contactor.

[0065] The battery disconnect unit of the application controls the on and off of each contactor through the instruction of the battery management unit, can independently turn on and off the two sodium ion battery modules and the two lithium ion battery modules respectively, so as to realize the mixed work of the two sodium ion battery modules and the two lithium ion battery modules under normal working conditions, and only supply power through the sodium ion battery module under high temperature or low temperature working conditions. Therefore, the adaptability of the hybrid battery system under high and low temperature conditions is improved, the hybrid battery system can work normally under high temperature environment and low temperature environment, the endurance ability under low temperature environment is improved, and the problems of battery safety and comfort under high temperature environment are solved.

[0066] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interface, device or unit, which can be electrical, mechanical or other forms.

[0067] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0068] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0069] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a nonvolatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application or the parts of the present application that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0070] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hybrid battery system, characterized by, The hybrid battery system comprises a battery management unit, a battery disconnect unit, a first sodium-ion battery module, a second sodium-ion battery module, a first lithium-ion battery module, a second lithium-ion battery module, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, and a load unit; One end of the first sodium-ion battery module is electrically connected to the load unit, and the other end of the first sodium-ion battery module is electrically connected to one end of the first contactor and one end of the second contactor, respectively; One end of the first lithium-ion battery module is electrically connected to the other end of the first contactor, one end of the fifth contactor is electrically connected to the other end of the first lithium-ion battery module, the other end of the fifth contactor is electrically connected to the other end of the second contactor and one end of the second sodium-ion battery module, respectively, and the other end of the second sodium-ion battery module is electrically connected to one end of the third contactor and one end of the fourth contactor, respectively; One end of the second lithium-ion battery module is electrically connected to the other end of the fourth contactor, and the other end of the second lithium-ion battery module and the other end of the third contactor are electrically connected to the load unit, respectively; The battery management unit is connected to the battery disconnect unit, the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module, and the second lithium-ion battery module; The battery disconnect unit is connected to the first contactor, the second contactor, the third contactor, the fourth contactor, and the fifth contactor.

2. The hybrid battery system of claim 1, wherein, In the sodium battery and lithium battery hybrid working mode, the first contactor, the fourth contactor, and the fifth contactor are all closed, the second contactor and the third contactor are both disconnected, and the first sodium-ion battery module, the first lithium-ion battery module, the second sodium-ion battery module, and the second lithium-ion battery module work in series.

3. The hybrid battery system of claim 1, wherein, In the sodium battery working mode, the second contactor and the third contactor are both closed, the first contactor, the fourth contactor, and the fifth contactor are all disconnected, and the first sodium-ion battery module and the second sodium-ion battery module work in series.

4. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a temperature detection unit connected to the battery management unit, which detects the temperature of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module, and the second lithium-ion battery module.

5. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a voltage sensor connected to the battery management unit, which detects the voltage of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module, and the second lithium-ion battery module.

6. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a current sensor connected to the battery management unit, which detects the current of the first sodium-ion battery module, the second sodium-ion battery module, the first lithium-ion battery module, and the second lithium-ion battery module.

7. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a DC-DC module, an input positive electrode of the DC-DC module is electrically connected with a positive electrode of the first sodium ion battery module, and an input negative electrode of the DC-DC module is electrically connected with one end of the third contactor and a negative electrode of the second lithium ion battery module respectively; an output positive electrode and an output negative electrode of the DC-DC module are electrically connected with the load unit respectively.

8. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a display unit, the display unit is connected with the battery management unit, and the display unit displays state information of the first sodium ion battery module, the first lithium ion battery module, the second sodium ion battery module and the second lithium ion battery module.

9. The hybrid battery system of claim 1, wherein, The hybrid battery system further comprises a communication unit, one end of the communication unit is connected with the battery management unit, and the other end of the communication unit is connected with an external device, so as to transmit state information of the first sodium ion battery module, the first lithium ion battery module, the second sodium ion battery module and the second lithium ion battery module to the external device through the communication unit.

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