Dual-voltage battery pack, dual-voltage battery system and electric equipment

Abstract

The utility model provides a dual-voltage battery pack, a dual-voltage battery system and electric equipment. The dual-voltage battery pack comprises a first high-voltage system (1) and a second high-voltage system (2), the first high-voltage system (1) is formed by connecting a plurality of liquid batteries (3) in series; the second high-voltage system (2) is formed by connecting a plurality of solid-state batteries (4) in series; and the at least one liquid battery (3) and the at least one solid battery (4) are alternately arranged. According to the dual-voltage battery pack, the dual-voltage battery system and the electric equipment, the volumetric specific energy of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a dual-voltage battery pack, a dual-voltage battery system and a power-consuming device. BACKGROUND

[0002] With the increasing demand for renewable energy and environmentally friendly transportation tools worldwide, power battery technology has developed rapidly. Among them, the assembly method of the battery pack is an important link to ensure the performance, safety and reliability of the battery.

[0003] At present, the battery pack is composed of multiple liquid-state batteries, and aerogels are arranged between the liquid-state batteries to buffer the impact between the liquid-state batteries in the pack.

[0004] However, in the above-mentioned manner, the material properties of the battery material used by the liquid-state battery limit the doubling of the battery capacity per unit volume, and thus the volume-specific energy of the battery pack cannot be improved. CONTENT OF THE INVENTION

[0005] The present application provides a dual-voltage battery pack, a dual-voltage battery system and a power-consuming device, which can improve the volume-specific energy of the battery pack.

[0006] In a first aspect, the present application provides a dual-voltage battery pack, comprising: a first high-voltage system (1) and a second high-voltage system (2); the first high-voltage system (1) is composed of a plurality of liquid-state batteries (3) in series; the second high-voltage system (2) is composed of a plurality of solid-state batteries (4) in series; at least one liquid-state battery (3) and at least one solid-state battery (4) are arranged alternately.

[0007] In a possible implementation, the solid-state battery (4) is composed of a plurality of solid-state battery units (5) stacked together.

[0008] In a possible implementation, the solid-state battery unit (5) comprises a solid-state electrolyte (6), a positive electrode (7) and a negative electrode (8).

[0009] In a possible implementation, the solid-state electrolyte (6) comprises one of inorganic solid-state electrolyte (ISEs), solid-state polymer electrolyte (SPEs) and inorganic-organic composite solid-state electrolyte (CSEs).

[0010] In a possible implementation, the surface of the solid-state battery (4) is coated with a temperature-sensitive coating (9).

[0011] In a possible implementation, the second high-voltage system (2) further comprises a temperature sensing element (10);

[0012] The temperature sensing element (10) is used to collect the temperature inside the second high-voltage system (2).

[0013] In a second aspect, the application provides a dual-voltage battery system, comprising: a first battery monitoring system (11), a second battery monitoring system (12), and the dual-voltage battery pack of the first aspect; the first battery monitoring system (11) is connected with the first high-voltage system (1) in the dual-voltage battery pack; the second battery monitoring system (12) is connected with the second high-voltage system (2) in the dual-voltage battery pack.

[0014] The first battery monitoring system (11) is used to monitor the battery state of the first high-voltage system (1).

[0015] The second battery monitoring system (12) is used to monitor the battery state of the second high-voltage system (2).

[0016] In a possible implementation, the dual-voltage battery system further comprises a voltage conversion system (13); the voltage conversion system (13) is connected with the second high-voltage system (2); the voltage conversion system (13) is also connected with the second battery monitoring system (12).

[0017] The voltage conversion system (13) is used to obtain the battery temperature sensing and the battery power of the second high-voltage system (2) from the second battery monitoring system (12), and to allocate the second high-voltage system (2) to charge the first high-voltage system (1) based on the battery temperature sensing and the battery power.

[0018] In a possible implementation, the voltage conversion system (13) is also used to regulate the second high-voltage system (2) to charge an external power supply system.

[0019] In a third aspect, the application provides a power-consuming device, comprising the dual-voltage battery system of the second aspect.

[0020] The dual-voltage battery pack, the dual-voltage battery system, and the power-consuming device provided by the application, the dual-voltage battery pack comprises: a first high-voltage system (1) and a second high-voltage system (2); the first high-voltage system (1) is composed of a plurality of liquid-state batteries (3) in series; the second high-voltage system (2) is composed of a plurality of solid-state batteries (4) in series; at least one liquid-state battery (3) and at least one solid-state battery (4) are arranged alternately. By replacing the aerogel between the liquid-state batteries with solid-state batteries, the dual-voltage battery pack can not only buffer the impact between the liquid-state batteries in the battery pack body, but also introduce a second high-voltage system that can prolong the endurance, so as to improve the volume energy density of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0022] Figure 1 A schematic diagram of a conventional battery pack arrangement for embodiments of the application;

[0023] Figure 2 A schematic diagram of a battery arrangement for a dual voltage battery pack for embodiments of the application Figure One ;

[0024] Figure 3 A schematic diagram of a battery arrangement for a dual voltage battery pack for embodiments of the application Figure Two ;

[0025] Figure 4 A schematic diagram of a solid state battery for embodiments of the application;

[0026] Figure 5 A schematic diagram of a solid state battery cell for embodiments of the application;

[0027] Figure 6 A schematic diagram of a dual voltage battery system for embodiments of the application Figure One ;

[0028] Figure 7 A schematic diagram of a dual voltage battery system for embodiments of the application Figure Two .

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1 - first high voltage system; 2 - second high voltage system; 3 - liquid battery; 4 - solid state battery; 5 - solid state battery cell; 6 - solid state electrolyte; 7 - positive electrode; 8 - negative electrode; 9 - temperature sensing coating; 10 - temperature sensing element; 11 - first battery monitoring system; 12 - second battery monitoring system; 13 - voltage conversion system; 14 - pure electric vehicle; 15 - battery pack; 16 - liquid lithium battery; 17 - aerogel.

[0031] The specific embodiments of the application have been shown by way of example in the above-described figures, and will be described in more detail hereafter. These drawings and the written description are not intended to restrict the scope of the inventive concept in any way but are merely meant to illustrate specific embodiments of the inventive concept to those skilled in the art. DETAILED DESCRIPTION

[0032] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements, unless the context of use indicates otherwise. The following description of exemplary embodiments is not representative of all embodiments consistent with the present application. Rather, it is merely an example of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0033] The use of the electric device provided by the embodiments of the present application can include but is not limited to the use of battery packs in pure electric vehicles, hybrid electric vehicles, etc.

[0034] The specific scenario of the present application is that the electric device includes a battery pack, which is assembled by a plurality of liquid-state batteries.

[0035] For example, in the embodiments of the present application, a pure electric vehicle (14) is taken as an example to illustrate the above-mentioned electric device, Figure 1 A schematic diagram of a conventional battery arrangement of a battery pack is provided in the embodiments of the present application, as shown in Figure 1 The pure electric vehicle (14) is provided with a battery pack (15); the battery pack (15) is composed of a plurality of liquid-state lithium batteries (16), wherein an aerogel (17) is arranged between every two liquid-state lithium batteries (16) to buffer the vibration, impact and heat conduction between the liquid-state lithium batteries (16) in the battery pack.

[0036] However, in the above-mentioned manner, the material properties of the battery material used by the liquid-state lithium battery (16) limit the doubling of the battery capacity of the battery pack (15) per unit volume. For example, lithium iron phosphate LFP is used as the positive electrode material in the liquid-state lithium battery (16), and graphite-based material is used as the negative electrode material. The material properties limit the capacity improvement of the liquid-state lithium battery (16), which cannot improve the volume energy density of the battery pack (15), and thus cannot meet the requirements of the super endurance pure electric vehicle (14).

[0037] To solve the problem, in the embodiments of the present application, a dual-voltage battery pack based on solid-state batteries is provided, which includes a first high-voltage system (1) composed of a plurality of liquid-state batteries (3) in series, and a second high-voltage system (2) composed of a plurality of solid-state batteries (4) in series, wherein at least one liquid-state battery (3) and at least one solid-state battery (4) are arranged alternately. In this way, the solid-state batteries (4) in the dual-voltage battery pack replace the original aerogel (17), so that the dual-voltage battery pack can not only buffer the impact between the liquid-state batteries and the liquid-state batteries in the battery pack body, but also introduce a second high-voltage system that can prolong the endurance, so as to improve the long-endurance capability of the battery pack. Therefore, the dual-voltage battery pack provided in the embodiments of the present application solves the problem that the capacity of the battery pack per unit volume cannot be doubled due to the material characteristics of the battery materials used by the liquid-state batteries in the existing battery pack, and thus the volume-specific energy of the battery pack cannot be improved.

[0038] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0039] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0040] The embodiments of the present application provide a dual-voltage battery pack, which includes a first high-voltage system (1) and a second high-voltage system (2); the first high-voltage system (1) is composed of a plurality of liquid-state batteries (3) in series; the second high-voltage system (2) is composed of a plurality of solid-state batteries (4) in series; at least one liquid-state battery (3) and at least one solid-state battery (4) are arranged alternately.

[0041] Exemplary, Figure 2 A schematic diagram of a battery arrangement of a dual-voltage battery pack provided in the embodiments of the present application Figure OneAs shown in the figure, the dual-voltage battery pack includes: a first high-voltage system (High Voltage System 1, referred to as HVS1) (1) and a second high-voltage system (High Voltage System 2, referred to as HVS2) (2). The HVS1 (1) includes a plurality of liquid batteries (3), and each liquid battery (3) is connected in series. Each liquid battery (3) can be a blade liquid battery. The HVS2 (2) includes a plurality of solid-state batteries (4), and each solid-state battery (4) is connected in series. Each solid-state battery (4) can be made very thin (only 0.1mm thick) and can be made into various shapes and sizes, and can be directly integrated into any package. Among them, one or more liquid batteries (3) and one or more solid-state batteries (4) are alternately arranged and stacked into a dual-voltage battery pack, as shown in Figure 2 Each liquid battery (3) and each solid-state battery (4) are alternately arranged.

[0042] For example, Figure 3 A schematic diagram of a battery arrangement of a dual-voltage battery pack provided by an embodiment of the present application Figure Two In the dual-voltage battery pack, every n liquid batteries (3) and every m solid-state batteries (4) are alternately arranged, n is greater than 1, and / or m is greater than 1.

[0043] In this embodiment, the dual-voltage battery pack includes: a first high-voltage system (1) and a second high-voltage system (2); the first high-voltage system (1) is composed of a plurality of liquid batteries (3) connected in series; the second high-voltage system (2) is composed of a plurality of solid-state batteries (4) connected in series; at least one liquid battery (3) and at least one solid-state battery (4) are alternately arranged. By replacing the aerogel between the liquid batteries with a solid-state battery, the dual-voltage battery pack can not only buffer the impact between the liquid batteries in the battery pack, but also introduce a second high-voltage system that can prolong the endurance, thereby improving the volume energy density of the battery pack.

[0044] In a possible implementation, the solid-state battery (4) is composed of a plurality of solid-state battery units (5) stacked together.

[0045] For example, each solid-state battery (4) includes a plurality of solid-state battery units (5). Since each solid-state battery (4) is a laminated battery, all solid-state battery units (5) are connected and stacked to form a solid-state battery (4).

[0046] For example, Figure 4 A structure diagram of a solid-state battery provided by an embodiment of the present application is as follows Figure 4As shown, a solid-state battery (4) can integrate 6 (or even more) solid-state battery cells (5). If the voltage of each solid-state battery cell (5) is 4V, the voltage of a solid-state battery (4) can reach 24V, so that the voltage of the HVS2 (2) can be very high.

[0047] In one possible implementation, the solid-state battery cell (5) includes a solid electrolyte (6), a positive electrode (7), and a negative electrode (8).

[0048] For example, Figure 5 This is a schematic diagram of the structure of a solid-state battery cell provided in an embodiment of this application, as shown below. Figure 5 As shown, each solid-state battery cell (5) includes a solid electrolyte (6), a positive electrode (7), and a negative electrode (8). The solid-state battery cells (5) are connected and stacked to form a solid-state battery (4). Since each solid-state battery does not contain electrolyte, it has its inherent safety properties and is therefore more stable. It will not cause danger due to overcharging, damage, or overuse of the battery, thus ensuring the safety performance of the dual-voltage battery pack.

[0049] In one possible implementation, the solid electrolyte (6) includes one of inorganic solid electrolytes (ISEs), solid polymer electrolytes (SPEs), and inorganic-organic composite solid electrolytes (CSEs).

[0050] For example, the solid electrolyte (6), as the core component of the solid-state battery (4), mainly includes one of the following: inorganic solid electrolytes (ISEs), solid polymer electrolytes (SPEs), and inorganic-organic composite solid electrolytes (CSEs). These solid electrolytes have high thermal stability and can absorb the heat of HVS1 (1) (to a certain extent enhancing its own ionic conductivity), which can simplify the external cooling system module of the battery pack; at the same time, solid-state batteries can be charged and discharged thousands of times, and have a low self-discharge rate and no memory effect.

[0051] In one possible implementation, the content of inorganic filler in the solid electrolyte (6) is ≤40%.

[0052] Exemplarily, the content of the inorganic filler in the solid-state electrolyte (6) is ≤40%, and the content of the inorganic filler can be ≥15%, for example, the content of the inorganic filler is one of 15%, 20%, 25%, 30%, 35%, 40% or a range composed of any two of them. The solid-state battery cell (5) containing the inorganic filler with a content of ≤40% is flexible, between the traditional two batteries in the package, not only can act as a "aerogel" buffer to stack the blade battery in the package, especially in its shape, which is very plastic and easy to match with the liquid battery (3) in the dual-voltage battery package, so that in the package with force stacking, the interface between the solid-state battery (4) and the liquid battery (3) is optimized, and the heat generated by the operation of the liquid battery (3) is used as a heat source to optimize the performance of the solid-state battery (4). So that the solid-state battery (4) can withstand a large stacking force in the battery package without safety risks.

[0053] It is worth supplementing that, in order to further ensure the flexibility and mechanical properties of the solid-state battery (4) composed of the solid-state battery cell (5), the SPEs in the solid-state electrolyte (6) include but are not limited to polyethylene oxide, polyacrylonitrile, polymethyl methacrylate, polyvinylidene fluoride, poly(vinylidene fluoride-co-hexafluoropropylene) and polypropylene carbonate; the lithium salt in the solid-state electrolyte (6) includes but is not limited to LiTFSI, LiFSI, LiNO3 and LiClO4; the inorganic filler in the CSEs includes inert fillers and ion conductors, the inert fillers include but are not limited to SiO2, Al4B2O9 and C3N4; the ion conductors include but are not limited to Garnet type, NASICON type, Perovskite type and sulfide solid-state electrolyte. The particle structure of the inorganic filler can be 0D particle, 1D fiber / nanowire, 3D framework structure, etc.; the content of the inorganic filler in the CSEs in the solid-state electrolyte (6) is ≤40%, which can improve the flexibility of the solid-state electrolyte (6); the content of the inorganic filler is ≥40%, and the mechanical strength of the solid-state electrolyte (6) is high.

[0054] In a possible implementation, the surface of the solid-state battery (4) is coated with a temperature sensing coating (9).

[0055] Exemplarily, since the solid-state battery (4) is sensitive to temperature, the higher the temperature, the stronger the ion transport capacity, and the combination Figure 4 The surface of each solid-state battery (4) can be coated with a temperature sensing coating (9).

[0056] In a possible implementation, the second high-voltage system (2) further includes a temperature sensing element (10);

[0057] The temperature sensing element (10) is used to collect the temperature inside the second high-voltage system (2).

[0058] Exemplary, in conjunction with Figure 3 Based on the fact that the solid-state battery (4) is sensitive to temperature, the second high-voltage system (2) further comprises a temperature sensing element (10) for collecting the temperature inside the second high-voltage system (2).

[0059] In this embodiment, the solid-state battery (4) based on SPEs and CSEs (≤40% inorganic filler) is the most preferred. The solid-state battery (4) with SPEs and CSEs electrolyte is flexible itself, and is between the traditional two batteries in the package. It not only acts as an "aerogel" buffer to stack the blade liquid battery in the package, but also optimizes the interface between the solid-state battery (4) and the liquid battery (3) when the package is stacked with force; at the same time, the solid-state battery (4) has no electrolyte, and has its inherent safety properties.

[0060] The embodiment of the present application also provides a dual-voltage battery system, comprising: a first battery monitoring system (11), a second battery monitoring system (12), and a dual-voltage battery pack as in the foregoing embodiments; the first battery monitoring system (11) is connected with the first high-voltage system (1) in the dual-voltage battery pack; the second battery monitoring system (12) is connected with the second high-voltage system (2) in the dual-voltage battery pack; the first battery monitoring system (11) is used for monitoring the battery state of the first high-voltage system (1); the second battery monitoring system (12) is used for monitoring the battery state of the second high-voltage system (2).

[0061] Exemplary, Figure 6 The structure of a dual-voltage battery system provided by the embodiment of the present application is shown in Figure One As shown in Figure 6 The dual-voltage battery system comprises a dual-voltage battery pack as in the foregoing embodiments, and further comprises a first battery monitoring system (11) configured for the first high-voltage system (1) in the dual-voltage battery pack, and a second battery monitoring system (12) configured for the second high-voltage system (2) in the dual-voltage battery pack. The first battery monitoring system (11) is connected with the first high-voltage system (1) and is used for monitoring the battery state of the first high-voltage system (1), such as the battery capacity and the battery temperature in the first high-voltage system (1); the second battery monitoring system (12) is connected with the second high-voltage system (2) and is used for monitoring the battery state of the second high-voltage system (2), such as the battery capacity and the battery temperature in the second high-voltage system (2).

[0062] In this embodiment, the dual-voltage battery system includes a dual-voltage battery pack as in the previous embodiment, by replacing the aerogel between the liquid batteries with a solid battery, so that the dual-voltage battery pack can not only buffer the impact between the liquid batteries in the battery pack, but also introduce a second high-voltage system that can extend the endurance, to improve the long-endurance capability of the battery pack. Furthermore, based on the two high-voltage systems of the dual-voltage battery pack, the dual-voltage battery system introduces a second high-voltage system that can extend the endurance, to improve the volume-specific energy of the battery pack.

[0063] In one possible implementation, the dual-voltage battery system further includes a voltage conversion system (13); the voltage conversion system (13) is connected to the second high-voltage system (2); the voltage conversion system (13) is also connected to the second battery monitoring system (12);

[0064] The voltage conversion system (13) is configured to obtain the battery temperature and the battery capacity of the second high-voltage system (2) from the second battery monitoring system (12), and to adjust the charging of the second high-voltage system (2) to the first high-voltage system (1) based on the battery temperature and the battery capacity.

[0065] For example, Figure 7 A structure of a dual-voltage battery system provided by the embodiment Figure Two As shown in Figure 7 The dual-voltage battery system further includes a voltage conversion system (13); the voltage conversion system (13) is connected to the second high-voltage system (2); the voltage conversion system (13) is also connected to the second battery monitoring system (12); so that the voltage conversion system (13) can obtain the battery temperature and the battery capacity of the second high-voltage system (2) from the second battery monitoring system (12), and adjust the charging of the second high-voltage system (2) to the first high-voltage system (1) based on the obtained battery temperature and battery capacity; for example, when the temperature reaches a certain threshold, HVS2 (2) can charge HVS1 (1) in reverse; or when the HVS1 (1) has very low power, HVS2 (2) can be used as a separate power supply system to double the endurance of the electric car.

[0066] In one possible implementation, the voltage conversion system (13) is further configured to regulate the charging of the second high-voltage system (2) to an external power supply system.

[0067] For example, based on the voltage conversion system (13), the second high-voltage system (2) can also be regulated as a separate power supply system, such as charging an external power supply system when the HVS1 (1) has very low power, to double the endurance of the electric car.

[0068] In this embodiment, the dual-voltage battery system is based on two high-voltage systems of the dual-voltage battery pack, HVS1 (1) can stabilize the initial endurance of the electric vehicle (mature system), the newly introduced HVS2 (2) high-voltage power supply system (newly developed system) can reversely charge HVS1 (1), or when the power of HVS1 (1) is extremely low, HVS2 (2) can be used as a power supply system alone to double the endurance of the electric vehicle.

[0069] The embodiments of the present application also provide a power-using device including the dual-voltage battery system in the foregoing embodiments. By replacing the aerogel between the liquid batteries with solid-state batteries, the dual-voltage battery pack can not only buffer the impact between the liquid batteries, but also introduce a second high-voltage system to extend the endurance and improve the volumetric energy density of the battery pack. Furthermore, the power-using device based on the dual-voltage battery pack of the solid-state batteries in the dual-voltage battery system realizes the dual high-voltage power supply system, the heat generated by the operation of the first high-voltage system (1) can improve the performance of the solid-state battery (4), when the temperature reaches a certain threshold, HVS2 (2) can reversely charge the first high-voltage system (1), and at the same time, it can also be used as a power supply system to supply the power-using device to operate, realizing the super endurance of the power-using device.

[0070] Those skilled in the art will readily understand that the present application is well adapted to carry out the objects and obtain the ends and advantages mentioned, as well as those inherent therein. The present application is not to be limited as to just the details of construction and the arrangement of components shown in the accompanying drawings, but is capable of other embodiments and of being practiced or being carried out in various ways. The description and examples are merely illustrative of the present application and are not intended to limit the scope of the application as defined by the claims.

[0071] It should be understood that the application is not limited to the precise construction and arrangement of parts described herein and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope of the application. The scope of the application is limited only by the claims appended hereto.

Claims

1. A dual-voltage battery pack, characterized in that, include: A first high-voltage system (1) and a second high-voltage system (2); the first high-voltage system (1) is composed of multiple liquid batteries (3) connected in series; the second high-voltage system (2) is composed of multiple solid batteries (4) connected in series; at least one of the liquid batteries (3) and at least one of the solid batteries (4) are arranged alternately.

2. The dual-voltage battery pack according to claim 1, characterized in that, The solid-state battery (4) is composed of at least one solid-state battery cell (5) stacked together.

3. The dual-voltage battery pack according to claim 2, characterized in that, The solid-state battery cell (5) includes a solid electrolyte (6), a positive electrode (7), and a negative electrode (8).

4. The dual-voltage battery pack according to claim 3, characterized in that, The solid electrolyte (6) includes one of inorganic solid electrolytes (ISEs), solid polymer electrolytes (SPEs), and inorganic-organic composite solid electrolytes (CSEs).

5. The dual-voltage battery pack according to claim 2, characterized in that, The surface of the solid-state battery (4) is coated with a temperature-sensitive coating (9).

6. The dual-voltage battery pack according to any one of claims 1-5, characterized in that, The second high-voltage system (2) also includes a temperature sensing element (10); The temperature sensing element (10) is used to collect the temperature inside the second high-voltage system (2).

7. A dual-voltage battery system, characterized in that, It includes a first battery monitoring system (11), a second battery monitoring system (12), and a dual-voltage battery pack as described in any one of claims 1-6; the first battery monitoring system (11) is connected to the first high-voltage system (1) in the dual-voltage battery pack; the second battery monitoring system (12) is connected to the second high-voltage system (2) in the dual-voltage battery pack; The first battery monitoring system (11) is used to monitor the battery status of the first high voltage system (1); The second battery monitoring system (12) is used to monitor the battery status of the second high voltage system (2).

8. The dual-voltage battery system according to claim 7, characterized in that, The dual-voltage battery system further includes a transformer system (13); the transformer system (13) is connected to the second high-voltage system (2); the transformer system (13) is also connected to the second battery monitoring system (12); The transformer system (13) is used to obtain the battery temperature and battery power of the second high voltage system (2) from the second battery monitoring system (12), and to adjust the charging of the second high voltage system (2) to the first high voltage system (1) based on the battery temperature and battery power.

9. The dual-voltage battery system according to claim 8, characterized in that, The transformer system (13) is also used to regulate the second high voltage system (2) to charge the external power supply system.

10. An electrical appliance, characterized in that, Includes the dual-voltage battery system according to any one of claims 7-9.

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