Battery box system and electric equipment

Abstract

The utility model provides a battery box system and electric equipment, and relates to the technical field of storage batteries, the battery box system comprises a first type of battery pack and a second type of battery pack; the first type battery pack comprises at least one first battery pack, and the first battery packs are connected in series; the second type battery pack comprises at least one second battery pack, and the second battery packs are connected in series; wherein the first battery packs and the second battery packs are different in battery type and same in volume, the ratio of the energy of the first battery packs to the energy of the second battery packs is 1: M (M is greater than 1), and the ratio of the number of the first battery packs to the number of the second battery packs is greater than M: 1. The first type of battery packs and the second type of battery packs can realize complementation in energy characteristics, the battery performance is optimized, and the energy density and safety of the battery box are improved through the relationship between the quantity and the energy, so that the transportation efficiency of electric equipment is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery box system and electrical equipment. Background Technology

[0002] With the development of the new energy industry, more and more vehicles are using lithium batteries as their power source, especially the electric heavy-duty truck industry, which has seen rapid growth recently. Since commercial vehicle battery systems currently use the electrical architecture of electric buses, and considering factors such as battery safety and economy, the system cells are generally based on lithium iron phosphate (LFP). However, facing the ever-increasing demand for vehicle range, LFP batteries have a relatively low energy density, making it difficult to significantly improve vehicle range. Furthermore, LFP batteries perform poorly in winter, especially during charging. Customers need to spend a significant amount of time waiting for the battery to heat up and reach a certain temperature before charging can begin, which severely impacts the customer's transportation efficiency.

[0003] In existing technologies, ternary lithium batteries are used to replace lithium iron phosphate batteries to improve the driving range of commercial vehicles. Furthermore, ternary lithium batteries perform well at low temperatures and can generally be used normally in winter. However, while ternary lithium batteries have a higher energy density, their safety is inferior to that of lithium iron phosphate batteries. If the entire battery system were switched to ternary lithium batteries, the occurrence of thermal runaway in such a large-capacity battery system would cause enormous losses.

[0004] Therefore, there is an urgent need to provide a battery box system or electrical device that can improve energy density while ensuring safety. Utility Model Content

[0005] This application provides a battery box system and electrical equipment to improve energy density while ensuring safety.

[0006] In a first aspect, this application provides a battery pack system, including a first type of battery pack and a second type of battery pack; the first type of battery pack includes at least one first battery pack, and each first battery pack is connected in series; the second type of battery pack includes at least one second battery pack, and each second battery pack is connected in series; wherein the first battery pack and the second battery pack have different battery types but the same volume, the energy ratio of the first battery pack to the energy of the second battery pack is 1:M (M>1), and the ratio of the number of first battery packs to the number of second battery packs is greater than M:1.

[0007] The battery pack system, as described above, comprises a first type of battery pack and a second type of battery pack, each consisting of multiple battery packs connected in series. This design allows the system to flexibly configure different types or performance levels of batteries to adapt to various application scenarios and combines the advantages of multiple battery types, improving safety. The first and second types of battery packs are connected in parallel, which increases the total current while maintaining a consistent voltage, thereby enhancing the output capacity of the battery pack system. The energy ratio of the first to the second battery pack is 1:M (M>1), allowing the system to flexibly allocate energy according to different application scenarios. For example, when high energy output is required, more of the second type of battery pack can be utilized; while when a balance between energy and power is needed, both types of battery packs can be used in tandem. The ratio of the number of first to second type battery packs is greater than M:1, meaning that the first type of battery packs have a numerical advantage, ensuring system safety. This design can improve system redundancy to a certain extent. Even if some of the first type of battery packs fail, the system can still maintain basic functions through the second type of battery packs, thereby enhancing system reliability.

[0008] In one possible design, the first battery pack is a lithium iron phosphate battery, and the second battery pack is a ternary lithium battery.

[0009] Through the above approach, lithium iron phosphate (LFP) batteries exhibit higher thermal stability and safety. In contrast, ternary lithium batteries have a lower thermal decomposition temperature (approximately 200°C) and relatively weaker safety. By combining LFP and ternary lithium batteries, the system can significantly improve overall safety while maintaining a certain energy density. The cycle life of LFP batteries is significantly longer than that of ternary lithium batteries. Due to the superior number of LFP batteries (a ratio greater than M:1), the overall lifespan of the system is extended, reducing replacement frequency and maintenance costs.

[0010] In one possible design, the ratio of the number of the first battery pack to the number of the second battery pack is 5 to 3.

[0011] By combining lithium iron phosphate batteries and ternary lithium batteries in a 5:3 ratio, the battery pack system achieves significant optimization in terms of safety, energy density, cycle life, low-temperature performance, cost control, and application scenario adaptability.

[0012] In one possible design, the second battery packs are diagonally distributed such that no two second battery packs are adjacent to each other.

[0013] By employing the aforementioned scheme and arranging the ternary lithium battery packs diagonally, this battery pack system achieves significant optimizations in safety, heat dissipation management, energy output balance, battery life extension, and system flexibility. This design not only enhances the overall system performance but also facilitates future upgrades and expansions, demonstrating high practicality and innovation.

[0014] In one possible design, a water-cooled unit and a battery management system are also included, with the first type of battery pack and the second type of battery pack connected in parallel; each of the first battery pack or the second battery pack is provided with a corresponding battery slave control unit, which is used to monitor the battery status of the first battery pack or the second battery pack; both the first type of battery pack and the second type of battery pack are connected to the battery management system and the water-cooled unit control unit, and each of the battery slave control units is electrically connected to the battery management system.

[0015] Through the above solution, the water-cooled unit effectively controls the battery pack temperature by circulating coolant, ensuring that the batteries operate within a safe temperature range and avoiding performance degradation and safety hazards caused by high or low temperatures. The water-cooled unit works in conjunction with the BMS to dynamically adjust the cooling intensity based on the battery status, further optimizing overall system performance and improving battery pack safety.

[0016] In one possible design, the water-cooled unit control unit includes a water-cooled unit, a first solenoid valve, and a second solenoid valve. The first solenoid valve is connected between each of the first battery packs and the water-cooled unit, and the second solenoid valve is connected between each of the second battery packs and the water-cooled unit. The first solenoid valve and the second solenoid valve are connected in parallel with each other.

[0017] Through the above scheme, the first and second solenoid valves are connected to the lithium iron phosphate battery pack and the ternary lithium battery pack, respectively. The first and second solenoid valves can independently control the flow of coolant according to the temperature status of the battery packs, ensuring that each battery pack operates within its optimal temperature range. The water-cooled unit control unit is tightly integrated with the battery management system (BMS) through the solenoid valves. The BMS can adjust the opening and closing of the solenoid valves in real time according to the battery status, achieving intelligent temperature management.

[0018] In one possible design, a charging device is also included, with the first type of battery pack and the second type of battery pack respectively connected to the output terminal of the charging device, and the positive and negative terminals of the water-cooled unit connected in parallel with the charging device.

[0019] With the above scheme, the first and second type battery packs are connected to the output terminals of the charging equipment, allowing the two battery packs to be charged independently according to their own characteristics. The positive and negative terminals of the water-cooled unit are connected in parallel with the charging equipment, enabling the cooling system to operate independently during charging. This parallel design ensures that the temperature management of the charging equipment and the battery packs during charging is not affected by each other, while improving the overall efficiency and safety of the system.

[0020] In one possible design, the system further includes: a first inverter and a second inverter, wherein the first type of battery pack is connected in parallel with the first inverter and the first inverter is connected to the battery management system; and the second type of battery pack is connected in parallel with the second inverter and the second inverter is connected to the battery management system.

[0021] Through the above scheme, the main function of the converter is to achieve bidirectional conversion between DC and AC power. The first and second converters are connected to the lithium iron phosphate battery pack and the ternary lithium battery pack, respectively, and can independently control the charging and discharging process according to the characteristics of the two battery packs. For example, the lithium iron phosphate battery pack can be charged stably at a lower current, while the ternary lithium battery pack can support fast charging.

[0022] In one possible design, a fire control unit is also included, with the battery management system connected to the fire control unit. The fire control unit includes a fire control panel, a first puncture valve, and a second puncture valve. Each first battery pack is connected to the first puncture valve, and each second battery pack is connected to the second puncture valve. The first puncture valve and the second puncture valve are connected to the fire control panel via a three-way valve.

[0023] In this scheme, the fire alarm control panel, as the core of the fire control unit, is responsible for monitoring and managing the operational status of the entire fire protection system. It receives fire alarm signals from the battery management system (BMS) and initiates corresponding fire suppression measures according to preset strategies. The fire control unit is connected to the BMS, which monitors battery status (such as temperature and voltage) in real time and sends alarm signals to the fire control panel when an anomaly is detected. The fire control panel then initiates appropriate fire suppression measures based on these signals, such as opening the puncture valve. By introducing the fire control unit, the battery box system achieves significant improvements in safety, reliability, and emergency response capabilities.

[0024] Secondly, this application provides an electrical device including any of the battery box systems described above.

[0025] The beneficial effects of the electrical equipment provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here.

[0026] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a battery box system structure provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of a battery box system with an inverter provided in one embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the water channel layout structure of a battery box system provided in an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the fire protection layout structure of a battery box system provided in an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the electrical architecture of a battery box system provided in an embodiment of this application.

[0033] Figure 6 This is an electrical schematic diagram of the high-voltage box of a battery box system provided in an embodiment of this application.

[0034] Figure 7 This is a flowchart of a control method for a battery box provided in an embodiment of this application.

[0035] Figure 8 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0036] Figure 9 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0037] Figure 10 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0038] Figure 11 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0039] Figure 12 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0040] Figure 13 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0041] Figure 14 This is a partial flowchart of a control method for a battery box provided in an embodiment of this application.

[0042] Figure 15 A power-on flowchart of a battery box provided in an embodiment of this application.

[0043] Figure 16 A flowchart illustrating the battery box's dragging mode according to an embodiment of this application.

[0044] Figure 17 This is a flowchart illustrating the external temperature control method for heating and regulating the battery box according to an embodiment of this application.

[0045] Figure 18 This is a flowchart illustrating the external temperature control method for cooling and regulating the battery box according to an embodiment of this application.

[0046] Figure 19 A control flowchart for standby heat preservation provided in an embodiment of this application.

[0047] Figure 20 This is a schematic diagram of a control device for a battery box system provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0050] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0052] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the battery box system of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0053] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0054] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0055] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is connected; it can also refer to the internal connection of two elements. A signal connection can refer not only to a signal connection through a circuit but also to a signal connection through a medium, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The Vehicle Control Unit (VCU) is a key component in electric or hybrid vehicles, responsible for the vehicle's power control and the coordination of various functions.

[0057] A Battery Management System (BMS) is a system used to monitor and manage battery cells.

[0058] The Battery Management Unit (BMU) is a key component of the battery management system. It is responsible for monitoring and managing the status of the corresponding battery pack to ensure the safe, efficient and stable operation of the battery.

[0059] The water-cooled chiller unit control unit (TMS) is the core component of the automated control system of the water-cooled air conditioning unit. Its main function is to control and regulate the temperature of each component to ensure that they operate within the optimal temperature range, thereby ensuring the safety and performance of the system.

[0060] The Fire Fighting System (FFS) is a control unit that enables single-unit fire suppression.

[0061] A DC / DC converter, also known as a DC / DC converter, is a power electronic device that transforms one type of DC voltage into another type of DC voltage, such as converting high-voltage DC into low-voltage DC, to meet the needs of subsequent circuits.

[0062] Currently, commercial vehicle battery systems on the market generally use lithium iron phosphate batteries. However, lithium iron phosphate performs poorly in low-temperature conditions, especially below 0°C, where it cannot be charged. Therefore, when charging is required below 0°C, the battery system needs to be heated until a certain temperature is reached before charging can begin. This heating process consumes the battery pack's own power, which significantly impacts the battery's driving range.

[0063] This application provides a battery pack system, including a first type of battery pack and a second type of battery pack. The first type of battery pack includes at least one first battery pack, and each first battery pack is connected in series. The second type of battery pack includes at least one second battery pack, and each second battery pack is connected in series. The first and second battery packs have different battery types but the same volume. The energy ratio of the first battery pack to the second battery pack is 1:M (M>1), and the ratio of the number of first battery packs to the number of second battery packs is greater than M:1. This design allows the system to flexibly configure different types or performance levels of batteries as needed to adapt to different application scenarios and can combine the advantages of multiple batteries to improve safety.

[0064] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0065] Figure 1 This is a schematic diagram of the battery box system structure provided in this embodiment. Please refer to it. Figure 1 This embodiment provides a battery box system, including: a water-cooled unit control unit, a first type of battery pack, a second type of battery pack, and a battery management system; the first type of battery pack includes at least one first battery pack, and each first battery pack is connected in series; the second type of battery pack includes at least one second battery pack, and each second battery pack is connected in series; the first battery pack and the second battery pack have different battery types, the first type of battery pack and the second type of battery pack are connected in parallel, and both the first type of battery pack and the second type of battery pack are connected to the battery management system and the water-cooled unit control unit.

[0066] The battery box system comprises two types of battery packs, each consisting of multiple battery cells connected in series. The different battery types in the first and second battery packs can refer to different voltages, capacities, energy densities, or chemical compositions. This diversity provides a wider range of applications and greater flexibility. This design allows the system to be flexibly configured with different types or performance levels of batteries to adapt to various application scenarios. The first and second battery packs are connected in parallel, which increases the total current while maintaining a consistent voltage, thereby improving the output capacity of the battery box system. The battery box system includes a battery management system for monitoring and managing the status of both battery packs, including real-time monitoring of parameters such as voltage, current, and temperature, as well as safe management of the battery charging and discharging process. It also includes a water-cooled unit control unit for managing battery thermal management, ensuring that the batteries operate at suitable temperatures, improving battery performance and lifespan. Because the battery box system contains different types of first and second battery packs, this allows for mutual charging and discharging between these two different types of batteries, achieving automatic heating. This design solves the problem of prolonged battery preheating in low-temperature environments, improving battery utilization and transportation efficiency. The automatic heating function reduces the waiting time for the batteries to heat up, allowing them to charge rapidly at lower temperatures, thus significantly improving transportation efficiency at the user end. Simultaneously, the combination of the first and second battery packs has complementary energy characteristics; for example, one pack may be better suited for high power output, while the other may be better suited for high energy density, thereby optimizing overall performance and ensuring safety. Different types of batteries can be selected and configured according to their energy levels, and the battery system is monitored and managed by the BMS, further ensuring the safety of the battery box system during use. In summary, this battery box system design, through its innovative structure and function, not only improves battery utilization and transportation efficiency but also ensures the safe and stable operation of the batteries through the BMS and water-cooled unit control unit.

[0067] In this embodiment, each first battery pack or second battery pack is provided with a corresponding battery slave control unit, which is used to monitor the battery status of the first battery pack or second battery pack.

[0068] In this embodiment, the first battery pack is a lithium iron phosphate battery, the second battery pack is a ternary lithium battery, and the number of the first battery cells is three-fifths of the number of the second battery cells.

[0069] Lithium iron phosphate (LFP) batteries have a long lifespan, good thermal stability, and cost-effectiveness, and are typically used in applications requiring high safety and long lifespan.

[0070] Ternary lithium batteries have high energy density, allowing them to store more energy in the same volume or weight, making them suitable for applications requiring high power and energy density. Depending on the cathode material, ternary lithium batteries can be NMC (nickel, manganese, and cobalt) or NCA (nickel, cobalt, and aluminum).

[0071] Lithium iron phosphate batteries offer better thermal stability, potentially simplifying the design of thermal management systems, while ternary lithium batteries, due to their high energy density, require more stringent temperature control. Therefore, in this embodiment, the number of cells in the first battery pack is three-fifths that of the second battery pack. This ratio may balance the voltage and energy density of the two battery systems to achieve optimal system performance. Furthermore, combining the lower-cost lithium iron phosphate batteries with the higher-energy-density ternary lithium batteries allows for a balance between cost and performance.

[0072] Under normal circumstances, for the same volume of battery pack, the energy density of ternary lithium batteries is 1.33 times that of lithium iron phosphate batteries. In this embodiment, to balance the charge of the two branches of the first and second type of battery packs, and for safety reasons, the energy proportion of ternary lithium batteries is controlled below 50%. Therefore, Figure 1 In the first type of battery pack, five identical first battery packs are connected in series in the branch. Figure 1 and Figure 2 Battery boxes 1 to 5 are used in the middle battery pack, while the second type of battery pack uses three identical second battery packs connected in series in the branch. Figure 1 and Figure 2 The battery system consists of eight battery packs (cells 6 to 8). If we define the capacity of a single lithium iron phosphate battery pack as nkWh, then the total capacity of the entire battery system is approximately 9nkWh. Compared to eight individual lithium iron phosphate battery packs, the overall system energy efficiency is increased by more than 10%.

[0073] You can refer to this. Figure 1 In this embodiment, the entire battery pack system can be arranged according to the common six-layer battery rack in commercial vehicles. Considering that the safety of ternary lithium batteries is not as stable as that of lithium iron phosphate batteries, we adopted a diagonal arrangement scheme in the arrangement of ternary lithium battery packs (that is, adjacent upper and lower battery packs are diagonally distributed, as shown in the positions of battery packs 6, 7 and 8 in the figure). The advantage of this arrangement scheme is that it can increase the spacing between ternary lithium battery packs, thereby reducing the risk of thermal spread to surrounding ternary lithium battery packs after thermal runaway of a single pack.

[0074] Since different types of battery packs have different voltages, in order to better ensure the voltage consistency between the two branches and reduce the circulating current in the circuit, a converter can be added at the end of each branch. After the voltage is converted by the converter, it is then fed into the high-voltage box. Figure 2This is a schematic diagram of the battery box system provided in this embodiment. Please refer to the references. Figure 2 The battery box system in this embodiment further includes: a first inverter and a second inverter, a first type of battery pack connected in parallel with the first inverter, and the first inverter connected to the battery management system; a second type of battery pack connected in parallel with the second inverter, and the second inverter connected to the battery management system.

[0075] Figure 3 This is a schematic diagram of the water channel layout structure of a battery box system provided in one embodiment of this application. Figure 3 As shown, the water-cooled unit control unit includes a water-cooled unit, a first solenoid valve, and a second solenoid valve. The first solenoid valve is connected between each first battery pack and the water-cooled unit, and the second solenoid valve is connected between each second battery pack and the water-cooled unit. The first solenoid valve and the second solenoid valve are connected in parallel.

[0076] In this embodiment, the first and second type of battery packs are connected in parallel, sharing a single water-cooled unit. An additional solenoid valve is added to each of the outlet branches of the water-cooled unit, allowing for easier control of the water circuits for both the first and second type of battery packs. This allows for the opening or closing of the corresponding solenoid valves according to system control requirements, thereby achieving separate cooling control for the first and second type of battery packs. In this embodiment, the battery packs within the branches containing the same type of battery pack are connected in parallel, which allows for better adjustment of the flow rate of each battery pack.

[0077] In some embodiments, a gasket may be added to the inlet connector of each battery pack, and the flow rate in each battery pack may be made consistent by controlling the area of ​​the gasket.

[0078] In this embodiment, a fire control unit is also included. The battery management system is connected to the fire control unit. The fire control unit includes a fire control panel, a first puncture valve, and a second puncture valve. Each first battery pack is connected to the first puncture valve, and each second battery pack is connected to the second puncture valve. The first puncture valve and the second puncture valve are connected to the fire control panel through a three-way valve.

[0079] Figure 4 This is a schematic diagram of the fire protection layout structure of the battery box system provided in this embodiment. Please refer to it. Figure 3 and Figure 4The battery pack system also includes a vehicle controller (VCU), with the battery management system (BMS) connected to it. The VCU can coordinate the vehicle's energy management based on information provided by the BMS, such as the battery's remaining charge (SOC), state of health (SOH), voltage, and temperature. It can adjust vehicle performance based on battery status, such as limiting power output to protect the battery or extend driving range. It can receive alarm signals from the BMS, such as overcharge, over-discharge, and overheating, and take timely measures to ensure the safety of the vehicle and its occupants. Through the connection between the BMS and VCU, the battery pack system not only achieves effective battery management but also works collaboratively with other vehicle control systems to improve overall vehicle performance and safety, while optimizing energy efficiency.

[0080] like Figure 4 As shown, to ensure the fire safety of the system, a fire control unit is installed in the battery box system. Figure 4 As can be seen, the entire fire control unit consists of a fire control panel, main fire pipeline, branch pipelines, puncture valve assembly, etc. The fire control panel can determine whether to trigger fire protection based on the signals detected by the detection modules in each battery box. Once the corresponding sensor signal is detected, the fire control panel opens the puncture valve of that branch, and the fire extinguishing medium inside is pumped to the corresponding battery box through the delivery pump, thereby realizing the single-box fire extinguishing function. At the same time, the fire control panel will send the fire alarm signal to the alarm module and BMS, and the BMS will then send the information to the VCU. Finally, the hazard information is displayed on the dashboard in the driver's cab, thereby realizing the warning effect for the driver and passengers.

[0081] Figure 5 This is a schematic diagram of the electrical architecture of the battery box system provided in this embodiment. Please refer to... Figure 5 The control unit of the entire battery box system is the BMS. The BMU (Battery Box Slave Unit), TMS (Water-cooled Unit Control Unit), FFS (Fire Protection Control Unit), and DC / DC (Converter) within the system all communicate with the BMS. In particular, the DC / DC module adjusts the output current of each branch in real time according to the power issued by the BMS. This electrical architecture can give full play to the advantages of the high rate of ternary lithium batteries. Especially under the condition of high rate for a short time, the BMS will let the ternary lithium batteries bear most of the power, so as not to generate high temperature rise in the system, which will significantly improve the service life of the system.

[0082] In this embodiment, a charging device is also included. The first type of battery pack and the second type of battery pack are respectively connected to the output end of the charging device, and the positive and negative terminals of the water-cooled unit are respectively connected in parallel with the charging device.

[0083] Figure 6 Please refer to the electrical schematic diagram of the high-voltage box of the battery box system provided in this embodiment. Figure 6In this embodiment, relays corresponding to the first type of battery pack and the second type of battery pack are connected in series in the input branch, which can be called the first branch relay and the second branch relay. In addition to more flexible control of the opening and closing of the first type of battery pack and the second type of battery pack, when the battery box system needs external charging equipment for power supply and heating, since the positive and negative terminals of the water-cooled unit are connected in parallel with the charging equipment, that is, the positive and negative terminals of the water-cooled unit are connected to the positive main circuit and the negative main circuit respectively, there will be voltage on the main circuit. The presence of voltage will charge the battery pack at the input end.

[0084] Figure 7 This is a flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 7 This embodiment provides a control method for a battery box, the control method including:

[0085] Step 1: Obtain the temperature value of the battery box. The battery box includes a first type of battery pack and a second type of battery pack, and the first type of battery pack and the second type of battery pack have different battery types.

[0086] The battery box comprises two types of battery packs. Combining these two different battery types allows the battery box to complement each other in terms of energy storage and power output. This satisfies the device's requirements for long battery life while also handling sudden high-power demands, improving the overall performance of the battery system and avoiding the safety risks associated with using a single high-energy-density battery. Different types of batteries have different minimum rechargeable temperatures; these values ​​are key parameters ensuring the battery can be safely and effectively charged in low-temperature environments.

[0087] In this embodiment, the battery pack in the first type of battery pack can be a lithium iron phosphate battery, and the battery pack in the second type of battery pack can be a ternary lithium system battery. Lithium iron phosphate batteries have high safety, while ternary lithium system batteries have high energy density. By combining the characteristics of lithium iron phosphate batteries and ternary lithium system batteries, and by adopting appropriate charge and discharge control strategies, the performance and safety of the battery pack can be effectively optimized, making it suitable for various practical application scenarios.

[0088] Step 2: When the temperature value is between the second temperature threshold and the first temperature threshold, control the first type of battery pack and the second type of battery pack to charge and discharge each other to heat the battery box; wherein, the second temperature threshold is the minimum of the minimum rechargeable temperature value of the first type of battery pack and the minimum rechargeable temperature value of the second type of battery; the first temperature threshold is greater than or equal to the maximum of the minimum rechargeable temperature value of the first type of battery pack and the minimum rechargeable temperature value of the second type of battery.

[0089] For example, the minimum rechargeable temperature of a lithium iron phosphate battery can be -20℃, while the minimum rechargeable temperature of a ternary lithium battery can be 0℃. The first temperature threshold is greater than 0℃; for example, the first temperature threshold can be 1℃, 2℃, 3℃, 4℃, 5℃, 8℃, 10℃, etc.

[0090] The above solution aims to prevent both the first and second battery packs from failing to charge at extremely low temperatures. A first temperature threshold and a second temperature threshold are set, both determined based on the minimum rechargeable temperature of the two battery packs. This accurately determines the minimum inter-chargeable temperature range of the battery box. The second temperature threshold is the minimum of the two minimum rechargeable temperatures. When the temperature is above the second threshold but below the first threshold, the first and second battery packs can self-heat through the heat generated during mutual charging and discharging. This ensures the battery box remains usable even when the ambient temperature is below the operating temperature, saving users the time of waiting for heating and improving transportation efficiency.

[0091] Figure 8 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 8 In this embodiment, after step 1, there can be step 201, where when the temperature value is greater than the third temperature threshold and less than the first temperature threshold, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other. The third temperature threshold is equal to the minimum rechargeable temperature value of the first type of battery pack, and the minimum rechargeable temperature value of the first type of battery pack is the maximum value.

[0092] For example, the first temperature threshold can be 5℃, and the third temperature threshold can be 0℃. When the temperature value is greater than 0℃ but less than 5℃, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other.

[0093] Through the above embodiments, when the temperature value is within a specific range (between the second and first temperature thresholds), the temperature control strategy is further refined by introducing a third temperature threshold. This segmented control method can more accurately manage the charging and discharging process of the battery pack, ensuring the safe operation of the battery system under different temperature conditions. By setting the third temperature threshold, the system can flexibly adjust the charging and discharging strategy according to different temperature ranges. This design not only enhances the system's adaptability but also better copes with complex and changing environmental conditions. When the temperature is between the third and first temperature thresholds, both types of battery packs can be charged or discharged. Therefore, when the temperature is between the third and first temperature thresholds, they can charge and discharge each other to increase the temperature of the battery pack, thereby allowing the battery pack to operate within a suitable temperature range and improving efficiency. Furthermore, by optimizing the charging and discharging control strategy, the system can maintain efficient operation over a wider temperature range. This design not only improves the overall efficiency of the battery system but also extends the battery's lifespan.

[0094] Figure 9 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 9 In this embodiment, after step 1, there can be step 202, where when the temperature value is greater than the second temperature threshold and less than the third temperature threshold, the first type of battery pack is controlled to charge the second type of battery pack.

[0095] For example, when the temperature is between -20℃ and 5℃, the first type of battery pack is controlled to charge the second type of battery pack.

[0096] Through the above embodiments, since the third temperature threshold is equal to the minimum rechargeable temperature of the first type of battery pack, the first type of battery pack cannot be charged (can only be discharged) when the temperature is below the third temperature threshold. Therefore, when the temperature is greater than the second temperature threshold and less than the third temperature threshold, controlling the discharge of the first type of battery pack can effectively prevent the first type of battery pack from being charged at excessively low temperatures, reduce the damage of low temperature to the internal chemical reaction and material structure of the battery, and extend the battery life of the first type of battery pack.

[0097] Figure 10 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 10 In this embodiment, after step 1, there can be step 203, where when the temperature value is between the second temperature threshold and the first temperature threshold and the total power value of the battery box is greater than or equal to the first power threshold, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other.

[0098] The total capacity value is the sum of the capacity values ​​of the first type of battery pack and the second type of battery pack. The first capacity threshold is the minimum discharge capacity of the battery box. The minimum discharge capacity of the battery box, i.e., the first capacity threshold, can be set according to the battery box specifications, and can be 20%, 30%, or 40% SOC, etc.

[0099] In this embodiment, the minimum discharge capacity of the battery pack can be 30% SOC. When the total capacity of the battery pack is greater than or equal to 30% SOC, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other.

[0100] Through the above embodiments, when the temperature value is between the second temperature threshold and the first temperature threshold, the charging and discharging control is further combined with the total capacity of the battery pack. This design not only considers temperature factors but also introduces capacity conditions, making the charging and discharging process more precise and safer. Mutual charging and discharging between the first and second type of battery packs is only allowed when the total capacity of the battery pack is greater than or equal to the first capacity threshold. When the total capacity is lower than the first capacity threshold, mutual charging and discharging between the two types of battery packs is stopped, effectively avoiding safety issues caused by over-discharge. Over-discharge leads to excessively low internal battery voltage, which may cause an imbalance in the internal chemical reaction of the battery, and even lead to battery damage or safety risks. This design ensures that the battery system has sufficient capacity reserves during energy interaction, avoiding system failures or performance degradation due to insufficient capacity. By introducing a control strategy based on both temperature and capacity conditions, the charging and discharging management of the battery system under complex operating conditions is optimized. This strategy not only improves the system's safety, reliability, and energy utilization efficiency but also extends battery life, enhances system adaptability, and significantly improves the user experience.

[0101] Figure 11 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 11 In this embodiment, after step 1, the following may also be included:

[0102] Step 204: Obtain the first charge value of the first type of battery pack and the second charge value of the second type of battery pack.

[0103] Step 205: When the temperature value is between the second temperature threshold and the first temperature threshold, and both the first and second charge values ​​are between the second and third charge thresholds, control the first and second battery packs to charge and discharge each other. The second charge threshold is determined based on the minimum dischargeable charge value of the first or second battery pack; the third charge threshold is determined based on the maximum rechargeable charge value of the first or second battery pack.

[0104] The second battery threshold can be 25%, 30%, or 40% SOC, etc. The third battery threshold can be 90%, 95%, or 98% SOC, etc.

[0105] In this embodiment, the minimum discharge capacity of the first type of battery pack or the minimum discharge capacity of the second type of battery pack can be 30% SOC, and the maximum rechargeable capacity of the first type of battery pack or the maximum rechargeable capacity of the second type of battery pack can be 95% SOC.

[0106] In this embodiment, when the charge values ​​of both the first type of battery pack and the second type of battery pack are between 30% and 95% SOC, the first type of battery pack and the second type of battery pack can charge or discharge each other.

[0107] When the charge level of the first type of battery pack is below 30% SOC, while the charge level of the second type of battery pack is between 30% SOC and 95% SOC, the second type of battery pack can be controlled to charge the first type of battery pack.

[0108] When the charge level of the second type of battery pack is below 30% SOC, while the charge level of the first type of battery pack is between 30% SOC and 95% SOC, the first type of battery pack can be controlled to charge the second type of battery pack.

[0109] The second power threshold is the minimum dischargeable capacity of either the first or second type of battery pack. When the power values ​​of both types of battery packs are greater than this threshold, it ensures that both types of battery packs can provide sufficient power during discharge. This helps avoid problems such as device instability or sudden power outages due to insufficient power, improving device reliability and user experience. The third power threshold is the maximum rechargeable capacity of either the first or second type of battery pack. When the power values ​​of both types of battery packs are less than this threshold, it avoids safety issues caused by overcharging. Overcharging leads to excessively high internal battery voltage, which may cause an imbalance in the internal chemical reaction of the battery, and even lead to battery damage or safety risks. Through the above control methods, it is ensured that the battery operates within a safe power range, improving the overall safety of the battery system.

[0110] Figure 12 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 12 In this embodiment, the control method may further include the following after step 1:

[0111] Step 110: Detect the temperature of the battery box and use an external temperature control method to heat or cool the battery box.

[0112] In some embodiments, heating the battery box using an external temperature control method includes: when the temperature value is greater than or equal to an eighth temperature threshold and less than a first temperature threshold, heating the battery box using an external temperature control method to make the temperature value of the battery box higher than the first temperature threshold, wherein the eighth temperature threshold is less than or equal to the first temperature threshold.

[0113] For example, the first temperature threshold is 5℃, and the eighth temperature threshold is -5℃. When the temperature value is between -5℃ and 5℃, an external temperature control method is used to heat the battery box so that the temperature value of the battery box is higher than 5℃.

[0114] In some embodiments, heating the battery box using an external temperature control method includes: when the temperature value is less than a second temperature threshold, that is, when the temperature is less than the minimum rechargeable temperature value of the first type of battery pack and the minimum rechargeable temperature value of the second type of battery, heating the battery box using an external temperature control method to make the temperature value of the battery box higher than 5°C.

[0115] For example, if the temperature is less than the minimum rechargeable temperature of the first type of battery pack and the minimum rechargeable temperature of the second type of battery, which is -20℃, then when the temperature is less than -20℃, an external temperature control method is used to heat the battery box to make the temperature of the battery box higher than 5℃.

[0116] In some embodiments, heating the battery box using an external temperature control method includes: when the total charge value of the battery box is lower than a first charge threshold, the first type of battery pack and the second type of battery pack cannot be heated by charging each other. Therefore, an external temperature control method can be selected to raise the temperature of the battery box.

[0117] In some embodiments, heating the battery box using an external temperature control method includes: when the first charge value of the first type of battery pack and the second charge value of the second type of battery pack are both not between the second charge threshold and the third charge threshold, and the temperature values ​​are both lower than the second charge threshold, then the first type of battery pack and the second type of battery pack cannot be heated by charging each other. Therefore, an external temperature control method can be selected to raise the temperature of the battery box.

[0118] In some embodiments, cooling the battery box using an external temperature control method includes: when the temperature value is greater than or equal to a fourth temperature threshold, cooling the battery box using an external temperature control method to make the temperature of the battery box lower than the fourth temperature threshold; the fourth temperature threshold is determined based on the highest operating temperature of the battery box.

[0119] The maximum operating temperature of the battery box is the maximum value within the temperature range within which the battery box can be used safely. For example, the maximum operating temperature of the battery box is 55℃. Using the battery box at a temperature exceeding 55℃ may lead to safety issues such as thermal runaway. When the temperature exceeds 55℃, an external temperature control method should be used to cool the battery box to keep its temperature below 55℃.

[0120] In this embodiment, the external temperature control method can be to heat or cool the coolant through a PTC (Positive Temperature Coefficient) or a compressor.

[0121] Through the above embodiments, when the temperature is below the first temperature threshold but above the eighth temperature threshold, external heating is used to raise the temperature above the first temperature threshold, ensuring the battery pack can safely start and operate in low-temperature environments. When the temperature exceeds the fourth temperature threshold, external cooling is used to prevent the battery box from overheating, avoiding performance degradation or safety hazards caused by high temperatures. By strictly controlling the temperature range of the battery box, the battery pack is prevented from operating at extreme temperatures. This design reduces battery performance degradation caused by high or low temperatures, thereby extending battery life. The external temperature control method is activated only when necessary, avoiding unnecessary heating or cooling operations. This strategy not only improves energy utilization efficiency but also reduces the overall energy consumption of the system. This design, by introducing external temperature control and combining it with fine-grained temperature threshold management, further optimizes the battery box's temperature control strategy. It not only improves the system's safety, reliability, and energy utilization efficiency but also extends battery life, enhances system adaptability, and significantly improves the user experience. This strategy is particularly suitable for battery management systems requiring high safety and high efficiency, ensuring stable operation of the battery system under complex environmental conditions.

[0122] Figure 13 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 13 In this embodiment, after step 1 or step 2, the method may further include:

[0123] Step 3: When the temperature value is greater than the first temperature threshold and less than or equal to the fourth temperature threshold, enter the power-on mode.

[0124] For example, when the temperature is greater than 5℃ but less than 55℃, the system is powered on and the battery box is discharged.

[0125] Through the above embodiments, by using the first and fourth temperature threshold ranges, the system only enters power-on mode, i.e., starts working, when the temperature is within the first and fourth temperature threshold ranges. This avoids the battery starting up at excessively low or high temperatures, thereby reducing safety hazards caused by abnormal temperatures. This strategy can effectively prevent malfunctions caused by temperatures exceeding the battery's safe operating range, such as battery overheating, short circuits, or performance degradation at low temperatures.

[0126] Figure 14 This is a partial flowchart of the control method for the battery box provided in this embodiment. Please refer to it. Figure 14 In this embodiment, after step 1 or step 2, the control method further includes:

[0127] Step 4: When the temperature value is between the first temperature threshold and the fifth temperature threshold, control the first type of battery pack and the second type of battery pack to charge and discharge each other so that the temperature value is within the first preset temperature range, wherein the first preset temperature range is between the sixth temperature threshold and the seventh temperature threshold, the sixth temperature threshold is greater than the fifth temperature threshold, and the seventh temperature threshold is less than the fourth temperature threshold.

[0128] The temperature range between the sixth and seventh temperature thresholds can be considered a heat preservation temperature. The battery box is more suitable for powering on within this temperature range. Therefore, the temperature of the battery box can be adjusted between the sixth and seventh temperature thresholds.

[0129] For example, the fifth temperature threshold is 15℃, the sixth temperature threshold can be 25℃, and the seventh temperature threshold can be 35℃. That is, when the temperature of the battery box is between 5℃ and 15℃, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other so that the temperature of the battery box can reach between the sixth and seventh temperature thresholds, so that the temperature of the battery box can be kept between 25℃ and 35℃.

[0130] Through the above embodiments, when the temperature value is between the first and fifth temperature thresholds, the temperature value is maintained within a first preset temperature range (between the sixth and seventh temperature thresholds) by controlling the charging and discharging between the first and second battery packs. This design achieves dynamic temperature regulation through energy interaction between the battery packs, avoiding large temperature fluctuations. Through the charging and discharging of the battery packs, the system can dynamically adjust the temperature, ensuring that the battery packs operate within their optimal operating temperature range. This strategy not only improves the overall performance of the system but also enhances the energy output efficiency of the battery packs.

[0131] Example 1

[0132] This embodiment also provides a control method for the battery box. Figure 15This is a power-on flowchart for a battery box provided in this embodiment. Please refer to it. Figure 15 First, the Battery Management System (BMS) receives the power-on command from the vehicle controller. The BMS then checks each control unit in the battery pack system. If no faults are found, it continues to determine the State of Charge (SOC) of the entire battery system (this SOC is the equivalent value of the total battery pack's charge). If the total charge is greater than 30%, it begins to check the battery pack's temperature. If the temperature exceeds the range of -20℃ to 55℃, the system will use external temperature control to regulate the battery pack's temperature, for example, by entering external heating mode (e.g.,...). Figure 10 ) or external cooling mode (such as Figure 11 ).

[0133] Figure 16 This is a flowchart illustrating a battery box in a drag-and-drop mode according to an embodiment of this application. Please refer to... Figure 16 If the system temperature is between -20℃ and 5℃, the system will enter a mutual charging / discharging mode. This mode involves the first and second battery packs charging and discharging each other to heat the battery pack. For example, the branch containing the lithium iron phosphate battery acts as the power source, while the branch containing the ternary lithium battery is the charging load. By controlling the corresponding DC / DC mode, the charging and discharging function between the branches is achieved.

[0134] When the battery box temperature is between 5℃ and 55℃, the battery box control system officially enters the power-on mode. The BMS commands both DC / DC converters to enter discharge mode. Then, the BMS battery management system controls the first branch relay, the second branch relay, the main negative relay, the main positive relay, and the water-cooling relay to close, causing both the first and second converters to discharge, thus realizing the power-on mode. After power-on is complete, the BMS sends a power-on completion command to the VCU. The BMS allocates power to the first converter (DC / DC-1) and the second converter (DC / DC-2) according to the VCU's power requirements. The VCU calculates the vehicle's power requirements based on the driver's intentions, converts them into current requirements, and sends them to the BMS. Because ternary lithium batteries have high-rate discharge performance, during high-power output of the vehicle, the BMS will increase the output power ratio of DC / DC-2 according to the VCU's power requirements. When the vehicle's power requirements are low, the BMS mainly provides power through DC / DC-1 to ensure stable discharge of the lithium iron phosphate battery. For example, when vehicle power demand is high, the BMS increases the output power ratio of the DC / DC-2, utilizing the high-rate discharge performance of the ternary lithium battery to meet the high power requirement, while reducing the discharge rate of the lithium iron phosphate battery. This control strategy can significantly reduce the discharge rate of the lithium iron phosphate cells, thereby effectively extending their service life.

[0135] Please refer to the reference. Figure 17 and Figure 18 When the battery box system temperature exceeds the allowable charging and discharging temperature, the BMS opens solenoid valve-1 and solenoid valve-2, then closes the water-cooled unit relay, and starts the PTC or compressor to heat or cool the coolant. When the branch temperature reaches the predetermined temperature, the system requests to stop the external power supply, and then switches to charging and discharging mode.

[0136] Please refer to Figure 19 For example, when the battery pack system is in winter, the ambient temperature is relatively low. This embodiment is equipped with a standby insulation mode, namely a low-power parallel-drive mode. The low-power parallel-drive mode achieves the insulation function. Compared with the traditional water-cooled unit heating insulation, the low-power parallel-drive mode can reduce power loss. When the vehicle stops, the BMS disconnects the water-cooled unit relay, then disconnects the main negative and main positive relays, and then controls the system to enter the low-power parallel-drive mode. During this process, the BMS continuously monitors the minimum temperature of the cells in branch 1 and branch 2. If the minimum temperature is less than 15°C, the system starts the parallel-drive mode. The BMS detects the SOC of the first and second type of battery packs. If the SOC values ​​of both the first and second type of battery packs are between 30% and 90%, the BMS controls DC / DC-1 to discharge mode and controls DC / DC-2 to enter charging mode. After an interval of 5 minutes, the charging and discharging modes are switched again. The system charges and discharges at low power. When the minimum temperature of the cell is ≥25°C or the maximum temperature of the cell is ≤35°C, the system pauses the parallel-drive mode and enters the hibernation standby mode.

[0137] Based on the above embodiments, Figure 20 This is a schematic diagram of the control device for the battery box system provided in this embodiment. Please refer to it. Figure 20 This application also provides a control device 500 for a battery box system, including: an acquisition module 510 and a first control module 520. The acquisition module 510 is used to acquire the temperature value of the battery box, wherein the battery box includes a first type of battery pack and a second type of battery pack, and the first type of battery pack and the second type of battery pack have different battery types. The first control module 520 is used to control the first type of battery pack and the second type of battery pack to charge and discharge each other to heat the battery box when the temperature value is between a second temperature threshold and a first temperature threshold; wherein the second temperature threshold is the minimum of the minimum rechargeable temperature value of the first type of battery pack and the minimum rechargeable temperature value of the second type of battery; the first temperature threshold is greater than or equal to the maximum of the minimum rechargeable temperature value of the first type of battery pack and the minimum rechargeable temperature value of the second type of battery.

[0138] In this embodiment, the first control module may further include a second control module. The second control module is used to control the first type of battery pack and the second type of battery pack to charge and discharge each other when the temperature value is greater than a third temperature threshold and less than a first temperature threshold. The third temperature threshold is equal to the minimum rechargeable temperature value of the first type of battery pack, and the minimum rechargeable temperature value of the first type of battery pack is the maximum value.

[0139] In this embodiment, the first control module may further include a third control module, which is used to control the first type of battery pack to charge the second type of battery pack when the temperature value is greater than the second temperature threshold and less than the third temperature threshold.

[0140] In this embodiment, the first control module may further include a fourth module. The fourth module is used to control the first type of battery pack and the second type of battery pack to charge and discharge each other when the temperature value is between the second temperature threshold and the first temperature threshold and the total power value of the battery pack is greater than or equal to the first power threshold. The total power value is the sum of the power values ​​of the first type of battery pack and the second type of battery pack, and the first power threshold is the minimum dischargeable power value of the battery pack.

[0141] In this embodiment, the first control module may further include a fifth module, which is used to obtain a first charge value of the first type of battery pack and a second charge value of the second type of battery pack; when the temperature value is between a second temperature threshold and a first temperature threshold, and both the first charge value and the second charge value are between a second charge threshold and a third charge threshold, the first type of battery pack and the second type of battery pack are controlled to charge and discharge each other, wherein the second charge threshold is determined based on the minimum dischargeable charge value of the first type of battery pack or the minimum dischargeable charge value of the second type of battery pack; and the third charge threshold is determined based on the maximum rechargeable charge value of the first type of battery pack or the maximum rechargeable charge value of the second type of battery pack.

[0142] In this embodiment, a sixth module may also be included. The sixth module is used to detect the temperature value of the battery box. When the temperature value is greater than or equal to an eighth temperature threshold and less than a first temperature threshold, the battery box is heated using an external temperature control method to make the temperature value of the battery box higher than the first temperature threshold, wherein the eighth temperature threshold is less than or equal to the first temperature threshold; or, the temperature value of the battery box is detected. When the temperature value is greater than or equal to a fourth temperature threshold, the battery box is cooled using an external temperature control method to make the temperature of the battery box lower than the fourth temperature threshold; the fourth temperature threshold is determined based on the highest operating temperature of the battery box.

[0143] It may also include a seventh module, which is used to enter the power-on mode when the temperature value is greater than the first temperature threshold and less than or equal to the fourth temperature threshold.

[0144] It may also include an eighth module, which is used to control the charging and discharging of the first type of battery pack and the second type of battery pack when the temperature value is between the first temperature threshold and the fifth temperature threshold, so that the temperature value is within a first preset temperature range, wherein the first preset temperature range is between the sixth temperature threshold and the seventh temperature threshold, the sixth temperature threshold is greater than the fifth temperature threshold, and the seventh temperature threshold is less than the fourth temperature threshold.

[0145] Based on the above embodiments, this application also provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of any of the above control methods.

[0146] Based on the above embodiments, this application also provides a computer-readable storage medium storing a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of any of the above control methods.

[0147] Based on the above embodiments, this application also provides a vehicle, specifically including: an electronic device for implementing any of the above control methods; a processor for running a program, which, when the program runs, executes the steps of any of the above control methods on data output from the electronic device; and a storage medium for storing a program, which, when running, executes the steps of any of the above control methods on data output from the electronic device.

[0148] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery box system, characterized by, The battery box system comprises: a first type of battery pack and a second type of battery pack; at least one first battery pack is included in the first type of battery pack, and each of the first battery packs is connected in series; at least one second battery pack is included in the second type of battery pack, and each of the second battery packs is connected in series; wherein the battery types of the first battery pack and the second battery pack are different and the volumes are the same, the energy ratio of the first battery pack to the second battery pack is 1: M (M>1), and the number ratio of the first battery pack to the second battery pack is greater than M:

1.

2. The battery pack system of claim 1, wherein, The first battery pack is a lithium iron phosphate battery, and the second battery pack is a ternary lithium battery.

3. The battery box system of claim 2, wherein, The number ratio of the first battery pack to the second battery pack is 5:

3.

4. The battery box system according to any one of claims 1 to 3, characterized by, The second battery packs are diagonally distributed so that any two of the second battery packs are not adjacent.

5. The battery pack system of claim 1, wherein, Further comprising a water cooling unit and a battery management system, the first type of battery pack and the second type of battery pack are connected in parallel; each of the first battery pack or the second battery pack is provided with a battery slave control unit, the battery slave control unit is used for monitoring the battery state of the first battery pack or the second battery pack; the first type of battery pack and the second type of battery pack are connected to the battery management system and the water cooling unit control unit, and each of the battery slave control unit and the battery management system is electrically connected.

6. The battery box system of claim 5, wherein, The water cooling unit control unit comprises a water cooling unit, a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve is connected between each of the first battery pack and the water cooling unit, the second electromagnetic valve is connected between each of the second battery pack and the water cooling unit, and the first electromagnetic valve and the second electromagnetic valve are connected in parallel with each other.

7. The battery box system of claim 5, wherein, Further comprising a charging device, the first type of battery pack and the second type of battery pack are respectively connected to the output end of the charging device, and the positive and negative electrodes of the water cooling unit are respectively connected in parallel with the charging device.

8. The battery box system of claim 5, wherein, Further comprising: a first current transformer and a second current transformer, the first type of battery pack is connected in parallel with the first current transformer, and the first current transformer is connected to the battery management system; the second type of battery pack is connected in parallel with the second current transformer, and the second current transformer is connected to the battery management system.

9. The battery pack system of claim 1, wherein, Further comprising a fire control unit, the battery management system is connected to the fire control unit, wherein the fire control unit comprises a fire host, a first piercing valve and a second piercing valve, each of the first battery pack is connected to the first piercing valve, and each of the second battery pack is connected to the second piercing valve; the first piercing valve and the second piercing valve are connected to the fire host through a three-way valve.

10. An electric device, characterized by The battery box system comprises any one of claims 1-9.

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