Battery system of electric vehicle having range-extending function, and range-extending method therefor

Abstract

A battery system of an electric vehicle having a range-extending function, and a range-extending method therefor. The battery system comprises a first accommodating cavity (10) which is pre-arranged in a vehicle body for a basic battery pack (11) to be mounted before the electric vehicle leaves a factory such that the electric vehicle can achieve a predetermined yet relatively small base driving range, and at least one second accommodating cavity (20) which is pre-arranged in the vehicle body for selecting to mount at least one range-extending battery pack (21) or a range-extending device as needed after the electric vehicle leaves the factory, so as to increase by at least one range-extending driving range. When each range-extending battery pack (21) or range-extending device is selected to be mounted on the electric vehicle, each range-extending battery pack or range-extending device can be started so as to be electrically connected to and integrated with the basic battery pack (11) to form a complete battery pack (60). Therefore, the electric vehicle can use the complete battery pack (60) to obtain a total driving range of the base driving range and each range-extending driving range to achieve a range-extending function.

Description

Battery system of electric vehicle with extended range function and method for extending range of electric vehicle TECHNICAL FIELD

[0001] The present application relates to a battery system of an electric vehicle, and in particular to a battery system of an electric vehicle with extended range function and a method for extending range of the electric vehicle. BACKGROUND

[0002] Firstly, the three types of electric vehicles currently available are hybrid electric vehicle, plug-in hybrid electric vehicle and pure electric vehicle, and their respective disadvantages are as follows: (A) Disadvantages of hybrid electric vehicle: although the vehicle is equipped with a battery, the capacity of the battery is small, the driving range of the battery is low, and the vehicle still relies on an internal combustion engine (fuel) to generate electricity (one type of hybrid electric vehicle is directly connected to the wheel shaft), and the internal combustion engine is fixed on the vehicle body before the vehicle is delivered from the factory, so the weight of the internal combustion engine will accelerate the consumption of the battery power. (B) Disadvantages of plug-in hybrid electric vehicle: the battery is large, so the selling price is higher than that of the hybrid electric vehicle, and due to the large battery and the weight of the engine for generating electricity (the engine for generating electricity is also fixed on the vehicle body before the vehicle is delivered from the factory), the overall weight of the vehicle is large, which affects the driving efficiency and the selling price. (C) Disadvantages of pure electric vehicle: the capacity of the battery is large, the price is more expensive, which affects the popularization rate, and the large battery and the heavy vehicle affect the driving efficiency, increase the tire wear, generate more rubber dust pollution, affect the air quality, and due to the long charging time, the distribution of charging piles is currently insufficient, which causes the users to have range anxiety.

[0003] Secondly, for the existing electric vehicles, the applicant believes that if the following problems cannot be properly solved, it will affect and is not conducive to the subsequent development of electric vehicles: (1) Environmental protection problem; the battery of the electric vehicle is too large, the amount of waste for future recycling will be relatively large, increasing the difficulty and cost of subsequent processing, and is not conducive to environmental protection; (2) Energy saving problem: The main purpose of developing electric vehicles is to solve the crisis of global warming. Electric vehicles do not need to be too large or too heavy. It is enough to meet the usage habits of consumers (for example, it is enough to meet the usage habits of consumers). If it is too large or too heavy, it will increase the energy consumption, not only increase the heat generation problem, but also increase the tire wear, and produce more rubber dust pollution; (3) Improve the popularization speed of new energy vehicles: if the battery is large, the price of the electric vehicle will be relatively high, which will easily force consumers to hesitate and may choose to stay with relatively cheap fuel vehicles; (4) Remove the attitude of automobile companies: some automobile companies may adopt a wait-and-see attitude due to the high price of the battery. If the battery cost can be reduced, it will accelerate the development of new energy vehicles by these automobile companies; (5) Energy diversification and economy: if various types of energy can be selected, such as energy that can be converted into electric energy, including fuel, various types of new energy generated electricity, hydrogen, methanol, etc., which energy is economical and cheap in price is selected, and if there is a lack of electricity, oil is used, and if there is a lack of oil, electricity is used, then the limitation of the existing electric vehicles that can only use electricity can be effectively solved; (6) Save consumers' economic expenditure: although the maintenance cost of the existing electric vehicles is low, each existing electric vehicle produced and manufactured by the automobile company is fixedly equipped with a predetermined size or storage capacity of the specified battery, and the specified battery often pursues a larger mileage, which is relatively unable to reduce the initial purchase cost of the electric vehicle; (7) Increase the utilization value of lithium, cobalt, nickel and other mineral resources: the main raw materials of the battery of the existing electric vehicle, such as lithium, cobalt, nickel and other mineral resources, are not only expensive, but also have a limited amount of known reserves on earth, so they should be used well and not be destroyed for the development of electric vehicles due to the range anxiety of electric vehicle users.

[0004] As can be seen from the above, for the problem of the existing electric vehicle battery being too large or too heavy or being too high in price or being not conducive to energy saving and environmental protection, especially for the problem that each existing electric vehicle produced and manufactured by the existing automobile company is fixedly equipped with a predetermined size and storage capacity of the specified battery pack, and the specified battery pack often pursues a larger or maximum mileage so as to be relatively unable to reduce the initial purchase cost of the electric vehicle, and for the problem of the permanent increase of the weight of the fixed type fuel engine of the hybrid electric vehicle affecting the driving efficiency, the applicant of the present application invents a battery system of an electric vehicle which is lightweight from the beginning (i.e. before the electric vehicle is delivered) and can become a range-extended electric vehicle on demand (i.e. after the electric vehicle is delivered) and a range-extended method thereof, to effectively solve the problems of the existing electric vehicles.

[0005] More specifically, the basic battery pack installed in the electric vehicle of the present application before it leaves the factory is intentionally designed to be different from the existing battery installed in the electric vehicle before it leaves the factory, because the existing battery installed in the electric vehicle before it leaves the factory is designed to enable the electric vehicle to achieve a greater or maximum mileage, for example, the existing electric vehicle often boasts that its existing battery can travel at least 500 kilometers or 600 kilometers or even greater mileage under the condition of full load after one charge, so that the existing electric vehicle will have many problems or shortcomings due to the battery pack being too large or too heavy or pursuing a greater or maximum mileage, and the present application provides an effective solution to the above-mentioned many problems or shortcomings.

[0006] SUMMARY

[0007] The main purpose of the present application is to provide a battery system of an electric vehicle with range extension function and a range extension method thereof, comprising a first cavity preset in the vehicle body of the electric vehicle for installing a basic battery pack before the electric vehicle leaves the factory to enable it to travel a predetermined but relatively small basic mileage, and at least one second cavity preset in the vehicle body of the electric vehicle for installing at least one range extension battery pack or range extension device as needed after the electric vehicle leaves the factory to increase at least one range extension mileage; when the electric vehicle is selected to install each range extension battery pack or range extension device, each range extension battery pack or range extension device can be started to electrically connect with the basic battery pack and integrate to form a complete battery pack, and the electric vehicle can complete the total mileage of the basic mileage and each range extension mileage through the complete battery pack to achieve the range extension function, thereby solving the many problems of the existing electric vehicle due to the battery pack being too large or too heavy or pursuing a greater or maximum basic mileage.

[0008] To achieve the above object, the present application provides a battery system with range-extended function for an electric vehicle, which comprises a first accommodating cavity prearranged in the vehicle body of the electric vehicle for installing a basic battery pack before the electric vehicle is shipped, and at least one second accommodating cavity prearranged in the vehicle body of the electric vehicle for selectively installing at least one range-extended battery pack according to the use requirement of the electric vehicle after the electric vehicle is shipped; wherein the basic battery pack has a basic matching electric quantity according to a predetermined but relatively small basic mileage of the electric vehicle so that the electric vehicle can complete the basic mileage by the basic matching electric quantity, and the basic mileage is defined as the total mileage of the basic battery pack from the completion of the previous charging operation to the next charging operation, and the basic mileage is prearranged as any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers; wherein each range-extended battery pack has a range-extended matching electric quantity according to a predetermined range-extended mileage of the electric vehicle so that the electric vehicle can complete the range-extended mileage by the range-extended matching electric quantity, and the range-extended mileage is defined as the total mileage of the range-extended battery pack from the completion of the previous charging operation to the next charging operation, and the range-extended mileage is prearranged as any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers; wherein when the electric vehicle is shipped, the electric vehicle is only installed with the basic battery pack so that the electric vehicle can complete the basic mileage by the basic matching electric quantity of the basic battery pack; wherein when the electric vehicle is selectively installed with each range-extended battery pack, each range-extended battery pack can be electrically connected with the basic battery pack and integrated to form a complete battery pack to provide the required electric power for the electric vehicle, and the electric vehicle can complete the total mileage of the basic mileage and each range-extended mileage by the complete battery pack formed by the basic matching electric quantity of the basic battery pack and the range-extended matching electric quantity of each range-extended battery pack, so that the electric vehicle achieves the range-extended function.

[0009] To achieve the above object, the present application further provides a battery system with range-extended function for an electric vehicle, which comprises a first accommodating cavity prearranged inside a vehicle body of the electric vehicle for installing a basic battery pack before the electric vehicle is shipped, and at least one second accommodating cavity prearranged inside the vehicle body of the electric vehicle for selectively installing at least one range-extended device according to the use requirement of the electric vehicle after the electric vehicle is shipped; wherein the basic battery pack is identical to the basic battery pack of the first embodiment; wherein each of the range-extended devices is correspondingly arranged with a range-extended device capable of generating a range-extended matching electric quantity according to a predetermined range-extended distance that the electric vehicle can travel, so that the electric vehicle can complete each of the range-extended distances by means of each of the range-extended matching electric quantities generated by each of the range-extended devices, and each of the range-extended distances is defined as the range-extended distance according to the total distance that each of the range-extended devices can travel between the time when the range-extended matching electric quantity is generated last time and the time when the range-extended matching electric quantity needs to be generated next time, and the range-extended distance is prearranged as any distance between 50 and 500 kilometers with a tolerance of 5 to 30 kilometers; wherein when the electric vehicle is shipped, the electric vehicle is only installed with the basic battery pack so that the electric vehicle can complete the basic distance by means of the basic matching electric quantity of the basic battery pack; wherein when the electric vehicle is selectively installed with each of the range-extended devices, each of the range-extended matching electric quantities generated by each of the range-extended devices can be electrically connected with the basic battery pack and integrated to form a complete battery pack to provide the electric vehicle with required electric power, and the electric vehicle can complete the total distance of the basic distance and each of the range-extended distances by means of the basic matching electric quantity of the basic battery pack and the complete battery pack integrated by each of the range-extended matching electric quantities generated by each of the range-extended devices, so that the electric vehicle achieves the range-extended function.

[0010] In an embodiment of the present application, wherein the arrangement position of each of the second accommodating cavities inside the vehicle body of the electric vehicle is different from the arrangement position of the first accommodating cavity inside the vehicle body of the electric vehicle.

[0011] In an embodiment of the present application, wherein each of the second accommodating cavities is arranged inside the rear compartment of the electric vehicle.

[0012] In an embodiment of the present application, wherein each of the range-extended devices is selected from one or more than one of the following group: a battery pack, a fuel cell, and an internal combustion engine power generation device.

[0013] In an embodiment of the present application, wherein each of the range-extended devices is further provided with at least one control switch for controlling the opening or closing of the electrical connection between the range-extended device and the basic battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a front sectional view schematically showing the basic battery pack installed in the first accommodating cavity in the first embodiment of the present application.

[0015] Figure 2 is a top cross-sectional view of Figure 1.

[0016] Figure 3 is a front cross-sectional view of a first embodiment of the present application, showing a range-extending battery pack installed in a second cavity.

[0017] Figure 4 is a front cross-sectional view of a first embodiment of the present application, showing two range-extending battery packs installed in a second cavity.

[0018] Figure 5 is a front cross-sectional view of a second embodiment of the present application, showing a range-extending device installed in a second cavity.

[0019] Figure 6 is a top cross-sectional view of Figure 5.

[0020] Figure 7 is a functional block diagram of a second embodiment of the present application, showing that the range-extending device is a battery pack.

[0021] Figure 8 is a functional block diagram of a second embodiment of the present application, showing that the range-extending device is a fuel cell.

[0022] Figure 9 is a functional block diagram of a second embodiment of the present application, showing that the range-extending device is an internal combustion engine generator.

[0023] Figure 10 is a functional block diagram of a method of the present application.

[0024] BRIEF DESCRIPTION OF THE DRAWINGS 1 - electric vehicle; 2 - battery system; 3 - electric vehicle; 4 - battery system; 5 - rear compartment; 10 - first cavity; 11 - base battery pack; 110 - base matching capacity; 20 - second cavity; 21 - range-extending battery pack; 210 - range-extending matching capacity; 30 - cavity; 31 - complete battery pack; 32 - battery cell; 40 - first cavity; 41 - base battery pack; 410 - base matching capacity; 50 - second cavity; 51 - range-extending device; 510 - range-extending matching capacity; 511 - battery pack; 512 - fuel cell; 513 - internal combustion engine generator; 52 - control switch; 60 - complete battery pack DETAILED DESCRIPTION

[0025] For the purpose of illustration, the structure of the present application and its technical features are described in detail as follows, in which each figure is only used to illustrate the structural relationship and related functions of the present application, and thus the size of each element in each figure is not drawn according to the actual proportion and is not used to limit the present application.

[0026] Referring to Figures 1 to 4, a first embodiment of a battery system 2 of the present application includes a first cavity 10, a base battery pack 11, at least one second cavity 20, and at least one range-extending battery pack 21. In Figures 1 to 4, the at least one second cavity 20 is exemplified by two second cavities 20, but this is not used to limit the present application.

[0027] The first cavities 10 are pre-set inside the vehicle body of the electric vehicle 1, for example, the first cavities 10 are set at the inner bottom of the vehicle body of the electric vehicle 1, that is, the positions where the battery packs of the existing electric vehicles of various brands are set as shown in Figs. 1 to 4, but are not limited. The first cavities 10 are for installing a basic battery pack 11 before the electric vehicle 1 is shipped. The basic battery pack 11 is pre-set with a basic matching electric quantity 110 according to a basic mileage that the electric vehicle 1 can run, so that the electric vehicle 1 can complete the basic mileage by the basic matching electric quantity 110. The basic mileage is defined as the basic mileage according to the total mileage that the basic battery pack 11 of the electric vehicle 1 can run between the completion of the previous charging operation and the next time when the charging operation is needed again, and the basic mileage is best pre-set as any mileage between 50 to 500 kilometers with a tolerance of 5 to 30 kilometers.

[0028] The second cavities 20 are pre-set inside the vehicle body of the electric vehicle 1, for example, the second cavities 20 are also set at the inner bottom of the vehicle body of the electric vehicle 1 as the first cavities 10, that is, the positions where the battery packs of the existing electric vehicles of various brands are set as shown in Figs. 1 to 4, but are not limited. The second cavities 20 are for the electric vehicle 1 to install the range-extended battery packs 21 according to the needs of the use of the electric vehicle 1 after the electric vehicle 1 is shipped, for example, the user (consumer) can choose to install one range-extended battery pack 21 as shown in Fig. 3 or two range-extended battery packs 21 as shown in Fig. 4, but this is not intended to limit the present application. The range-extended battery packs 21 are pre-set with a range-extended matching electric quantity 210 according to a range-extended mileage that the electric vehicle 1 can run, so that the electric vehicle 1 can complete the range-extended mileage by the range-extended matching electric quantity 210. The range-extended mileage is defined as the range-extended mileage according to the total mileage that the range-extended battery packs 21 of the electric vehicle 1 can run between the completion of the previous charging operation and the next time when the charging operation is needed again, and the range-extended mileage is best pre-set as any mileage between 50 to 500 kilometers with a tolerance of 5 to 30 kilometers.

[0029] The electric vehicle 1 of the present application is equipped with the basic battery pack 11 before leaving the factory, as shown in Figs. 1 and 2, so that the electric vehicle 1 can run a predetermined but relatively small basic mileage by the basic matching electric quantity 110 of the basic battery pack 11. In other words, the basic battery pack 11 equipped in the electric vehicle 1 of the present application before leaving the factory is intentionally designed to have a smaller basic matching electric quantity 110 so that the electric vehicle 1 can only run a predetermined but relatively small basic mileage. Therefore, the basic battery pack 11 equipped in the electric vehicle 1 of the present application before leaving the factory is different from the battery pack equipped in the electric vehicle of each existing brand before leaving the factory, which is set or pursues the goal of enabling the electric vehicle to achieve a larger or maximum mileage. Thus, the present application can avoid the problems or shortcomings of the electric vehicle of each existing brand due to the oversized or overweight battery pack or the pursuit of a larger or maximum mileage, which can be regarded as a main technical feature of the present application.

[0030] When the electric vehicle 1 of the present application is equipped with the range-extended battery pack 21 in each second cavity 20, for example, the use of the electric vehicle 1 suddenly changes from the daily state of running a small mileage (for example, the electric vehicle 1 is only used for daily commuting or picking up and dropping off children in a metropolitan area, but not limited) to the need of running a long mileage (for example, the electric vehicle 1 will be used for long-term business trips or long vacation travel for several days, but not limited), the electric vehicle 1 of the present application can be equipped with one range-extended battery pack 21 in each second cavity 20 as shown in Fig. 3, or two range-extended battery packs 21 as shown in Fig. 4. At this time, the range-extended battery pack 21 in each second cavity 20 can be electrically connected with the basic battery pack 11 in the first cavity 10 and integrated into a complete battery pack 31 to provide the required power for the electric vehicle 1. The electric vehicle 1 can complete the total mileage of the basic mileage and the range-extended mileage by the complete battery pack 31 formed by the basic matching electric quantity 110 of the basic battery pack 11 and the range-extended matching electric quantity 210 of the range-extended battery pack 21, so that the electric vehicle 1 achieves the range-extended function. This can be regarded as another main technical feature of the present application.

[0031] As can be seen from the above, the requirement of the present application or the core value is to make the electric vehicle as light as possible, and at the same time, to provide the most economical range-extended function for the electric vehicle to meet the range-extended needs of the user of the electric vehicle.

[0032] Referring to FIGS. 1-4, in the battery system 2 of the present application, the first cavity 10 and each second cavity 20 are combined to form a single cavity 30 inside the vehicle body of the electric vehicle 1. This facilitates the design, manufacture, installation or wiring design of the first cavity 10 and each second cavity 20. However, the above-mentioned technique of combining the first cavity 10 and each second cavity 20 to form a single cavity 30 can be achieved by using the current art, and is not the focus of the present application, and thus will not be described herein.

[0033] In the battery system 2 of the present application, the base battery pack 11 and each range-extending battery pack 21 are designed to have the same volume and the same size of battery cell 32 or a combination thereof. For example, the base battery pack 11 is designed to have two battery cells 32, as shown in FIGS. 1-4, but is not limited thereto, and each range-extending battery pack 21 is designed to have one battery cell 32, as shown in FIGS. 3 and 4. This facilitates the matching relationship between the base battery pack 11 and each range-extending battery pack 21, and the design, manufacture, management or installation thereof. However, the above-mentioned design can be achieved by using the current art, and is not the focus of the present application, and thus will not be described herein.

[0034] When the base battery pack 11 and each range-extending battery pack 21 are designed to have the same volume and the same size of battery cell 32 or a combination thereof, the base matching electric quantity 110 of the base battery pack 11 is equal to the range-extending matching electric quantity 210 of each range-extending battery pack 21 or a multiple thereof. For example, the base matching electric quantity 110 of the base battery pack 11 is equal to the total electric quantity of two battery cells 32, as shown in FIGS. 1-4, and the range-extending matching electric quantity 210 of each range-extending battery pack 21 is equal to the electric quantity of one battery cell 32, as shown in FIGS. 3 and 4. Further, when one or two range-extending battery packs 21 in each second cavity 20 and the base battery pack 11 in the first cavity 10 are electrically connected and integrated into a complete battery pack 31, and the total electric quantity is considered to be 100%, the base matching electric quantity 110 of the base battery pack 11 (including two battery cells 32) is set to 50%, and the range-extending matching electric quantity 210 of each range-extending battery pack 21 (including one battery cell 32) is set to 25%, as shown in FIGS. 3 and 4. In addition, if an existing electric vehicle intentionally installs a base battery pack with a smaller base matching electric quantity in the existing battery pack cavity before leaving the factory, and leaves a part of the space in the battery pack cavity for installing any battery pack after the existing electric vehicle leaves the factory to achieve the range-extending function, such a design can be considered as copying the technical features of the present application. That is, those skilled in the art understand that many changes, modifications or even equivalent changes can be made within the spirit and scope of the present application as defined in the claims, but all will fall within the protection scope of the present application.

[0035] Referring to FIG. 10, the method for extending the range of the electric vehicle according to the first embodiment of the present application comprises the following steps:

[0036] Step S1: For a battery pack required by an electric vehicle 1, a basic battery pack 11 and at least one range-extending battery pack 21 are divided.

[0037] Step S2: A first cavity 10 is arranged inside the vehicle body of the electric vehicle 1 to install the basic battery pack 11 before the electric vehicle 1 is shipped: wherein the basic battery pack 11 is provided with a basic matching electric quantity 110 according to a predetermined basic mileage that the electric vehicle 1 can travel to complete the basic mileage through the basic matching electric quantity 110, wherein the basic mileage is defined as the total mileage that the basic battery pack 11 of the electric vehicle 1 can travel between the completion of the previous charging operation and the next time when the charging operation is needed again, and the basic mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0038] Step S3: At least one second cavity 20 is arranged inside the vehicle body of the electric vehicle 1 to select and install each range-extending battery pack 21 according to the needs of the use of the electric vehicle 1 after the electric vehicle 1 is shipped, and when each range-extending battery pack 21 is selected and installed in each second cavity 20, each range-extending battery pack 21 can be electrically connected with the basic battery pack 11 and integrated into a complete battery pack 31 to provide all the power required by the electric vehicle: wherein each range-extending battery pack 21 is provided with a range-extending matching electric quantity 210 according to a predetermined range-extending mileage that the electric vehicle 1 can travel to complete the range-extending mileage through the range-extending matching electric quantity 210, wherein the range-extending mileage is defined as the total mileage that the range-extending battery pack 21 of the electric vehicle 1 can travel between the completion of the previous charging operation and the next time when the charging operation is needed again, and the range-extending mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0039] Step S4: According to the needs of the use of the electric vehicle 1, each range-extending battery pack 21 is selected and installed in the second cavity 20 of the electric vehicle 1, so that the electric vehicle 1 completes the total mileage of the basic mileage and each range-extending mileage through the integration of the basic battery pack 11 and each range-extending battery pack 21 to achieve the range-extending function.

[0040] Referring to FIGS. 5-9, the present application further provides a battery system 4 (second embodiment) of an electric vehicle 3 with a range-extended function, comprising a first cavity 40 prearranged inside the vehicle body of the electric vehicle 3 for installing a basic battery pack 41 before the electric vehicle 3 is shipped from the factory, so that the electric vehicle 3 can run a predetermined but relatively small basic mileage, and at least one second cavity 50 prearranged inside the vehicle body of the electric vehicle 3 for installing at least one range-extending device 51 after the electric vehicle 3 is shipped from the factory, so that the electric vehicle 3 can run at least one range-extended mileage according to the needs of the electric vehicle 3, wherein each range-extending device 51 is arranged according to a predetermined range-extended mileage of the electric vehicle 3, and each range-extending device 51 is capable of generating a range-extending matching electric quantity 510, so that the electric vehicle 3 can complete the range-extended mileage by using the range-extending matching electric quantity 510 generated by the range-extending device 51; when the electric vehicle 3 is selected to install each range-extending device 51, each range-extending device 51 can be started to generate each range-extending matching electric quantity 510 to be electrically connected with the basic battery pack 41 and integrated to form a complete battery pack 60, so that the electric vehicle 3 can complete the total mileage of the basic mileage and the range-extended mileage by using the complete battery pack 60 to achieve the range-extended function.

[0041] The basic battery pack 41 disclosed in the second embodiment of the present application actually has the same effect as the basic battery pack 11 disclosed in the first embodiment of the present application. The basic battery pack 41 has a basic matching electric quantity 410 according to a predetermined basic mileage of the electric vehicle 3, so that the electric vehicle 3 can complete the basic mileage by using the basic matching electric quantity 410, wherein the basic mileage is defined as the total mileage that the basic battery pack 41 of the electric vehicle 3 can run from the completion of the previous charging operation to the next charging operation, and the basic mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0042] The range-extending device 51 disclosed in the second embodiment of the present application actually has the same effect as the range-extending battery pack 21 disclosed in the first embodiment of the present application. Each range-extending device 51 is arranged according to a predetermined range-extended mileage of the electric vehicle 3, and each range-extending device 51 is capable of generating a range-extending matching electric quantity 510, so that the electric vehicle 3 can complete the range-extended mileage by using the range-extending matching electric quantity 510 generated by the range-extending device 51. The range-extended mileage is defined as the total mileage that the range-extending device 51 of the electric vehicle 3 can run from the previous generation of the range-extending matching electric quantity 510 to the next generation of the range-extending matching electric quantity, and the range-extended mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0043] Referring to FIG. 5 and FIG. 6, in the battery system 4 of the second embodiment of the present application, the setting position of each second accommodating cavity 50 inside the vehicle body of the electric vehicle 3 is different from the setting position of the first accommodating cavity 40, for example, the first accommodating cavity 10 is set at the inner bottom of the vehicle body of the electric vehicle 1, i.e. the position where the battery pack of each brand of electric vehicle is set as shown in FIG. 1 to FIG. 4 but not limited to; but each second accommodating cavity 50 can be set inside the rear compartment 5 of the electric vehicle 3 as shown in FIG. 5 and FIG. 6, or inside the front compartment 5 of the electric vehicle 3 (not shown in the figure) but not limited to the present application. In this way, it is relatively advantageous for the design, manufacture, installation or actual use and operation of each second accommodating cavity 50 and each range-extending device 51.

[0044] Referring to FIG. 7 to FIG. 9, in the battery system 4 of the second embodiment of the present application, each range-extending device 51 includes one or more than two combinations of a battery pack 511, a fuel cell 512, and an internal combustion engine power generation device 513, but not limited to. Due to the structural type or use function of each body of the battery pack 511 or the fuel cell 512 or the internal combustion engine power generation device 513, it can be achieved by the current technology in the field of battery technology or the field of fuel cell technology or the field of internal combustion engine power generation technology, and is not the focus of the present application, so the detailed structure of each range-extending device 51 is not described here.

[0045] Referring to FIG. 7 to FIG. 9, in the battery system 4 of the second embodiment of the present application, each range-extending device 51, including a battery pack 511, a fuel cell 512, an internal combustion engine power generation device 513 or a combination thereof, is further provided with at least one control switch 52 for controlling the opening or closing of the electrical connection between the range-extending device 51 (511, 512, 513) and the basic battery pack 41. In this way, it is advantageous for the actual use and operation of each range-extending device 51.

[0046] Referring to FIG. 10, the range-extending method of the electric vehicle of the second embodiment of the present application includes the following steps:

[0047] Step S1: For a battery pack required by an electric vehicle 3, a basic battery pack 41 and at least one range-extending device 51 are provided for generating electric power and outputting to the basic battery pack 41.

[0048] Step S2: A first cavity 40 is provided inside the vehicle body of the electric vehicle 3 for installing the basic battery pack 41 before the electric vehicle 3 is shipped: wherein the basic battery pack 41 is provided with a basic matching electric quantity 410 according to a predetermined basic mileage of the electric vehicle 3 so that the electric vehicle 3 can complete the basic mileage by the basic matching electric quantity 410, wherein the basic mileage is defined as the total mileage that the basic battery pack of the electric vehicle can run between the completion of the previous charging operation and the next need for charging operation, and the basic mileage is set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0049] Step S3: At least one second cavity 50 is provided inside the vehicle body of the electric vehicle 3 for installing at least one range-extending device 51 according to the needs of the electric vehicle 3 after the electric vehicle 3 is shipped, and when each range-extending device 51 is selected to be installed in each second cavity 50, the range-extending matching electric quantity 510 generated by each range-extending device 51 can be electrically connected to the basic battery pack 41 and integrated into a complete battery pack 60 to provide the required power for the electric vehicle: wherein each range-extending device 51 is selected from the following group: one or a combination of two or more of the following: battery pack 511, fuel cell 512, and internal combustion engine power generation device 513; wherein each range-extending device 51 is provided with a range-extending device 51 that can generate a range-extending matching electric quantity 510 according to a predetermined range-extending mileage of the electric vehicle 3 so that the electric vehicle 3 can complete the range-extending mileage by the range-extending matching electric quantity 510 generated by the range-extending device 51, wherein the range-extending mileage is defined as the total mileage that the range-extending device 51 of the electric vehicle 3 can run between the previous generation of range-extending matching electric quantity 510 and the next need for generation of range-extending matching electric quantity 510, and the range-extending mileage is set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

[0050] Step S4: According to the needs of the electric vehicle 3, each range-extending device 51 is selected and installed in the second cavity 50 of the electric vehicle 3, so that the electric vehicle 3 completes the total mileage of the basic mileage and each range-extending mileage by the integration of the basic matching electric quantity 410 of the basic battery pack 41 and the range-extending matching electric quantity 510 generated by each range-extending device 51 to achieve the range-extending function.

[0051] The above description is only the preferred embodiment of the present application, which is only illustrative but not limiting; those skilled in the art understand that many changes, modifications, and even equivalent changes can be made within the spirit and scope of the claims of the present application, but all will fall within the protection scope of the present application.

Claims

1. A battery system of an extended-range electric vehicle, characterized by comprising: The first cavity is prearranged inside the vehicle body of the electric vehicle for installing a basic battery pack before the electric vehicle is shipped out from the factory so that the electric vehicle can run a predetermined but relatively small basic mileage; and at least one second cavity is prearranged inside the vehicle body of the electric vehicle for installing at least one extended-range battery pack after the electric vehicle is shipped out from the factory so as to increase at least one extended-range mileage as needed; wherein when the electric vehicle is selected to install the at least one extended-range battery pack, each of the extended-range battery pack can be started to electrically connect with the basic battery pack and integrated to form a complete battery pack, so that the electric vehicle can complete the total mileage of the basic mileage and each of the extended-range mileage through the complete battery pack to achieve the extended-range function.

2. The battery system of claim 1, wherein, The basic battery pack has a basic matching electric quantity according to the electric vehicle running a predetermined but small basic mileage, so that the electric vehicle can complete the basic mileage through the basic matching electric quantity, wherein the basic mileage is defined as the basic mileage according to the total mileage of the electric vehicle that can be run between the completion of the previous charging operation and the next time when the charging operation is needed again, and the basic mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers; wherein each of the extended-range battery pack has an extended-range matching electric quantity according to the electric vehicle running a predetermined extended-range mileage, so that the electric vehicle can complete the extended-range mileage through the extended-range matching electric quantity; wherein each of the extended-range mileage is defined as each of the extended-range mileage according to the total mileage of the electric vehicle that can be run between the completion of the previous charging operation and the next time when the charging operation is needed again, and each of the extended-range mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

3. The battery system of claim 1, wherein, The first cavity and each of the second cavity can be combined inside the vehicle body of the electric vehicle to form a single cavity.

4. The battery system of claim 1, wherein, The basic battery pack and each of the extended-range battery pack are designed to have the same size of standardized battery cells or combinations thereof.

5. The battery system of claim 4, wherein, The basic matching electric quantity of the basic battery pack is equal to the extended-range matching electric quantity of each of the extended-range battery pack or a multiple thereof.

6. A range extending method of an electric vehicle with range extending function, characterized in that, The method comprises the following steps: Step S1: for the battery pack needed to be installed on an electric vehicle, divide it into a basic battery pack and at least one extended-range battery pack; Step S2: arrange a first cavity inside the vehicle body of the electric vehicle for installing the basic battery pack before the electric vehicle is shipped out from the factory; wherein the basic battery pack has a basic matching electric quantity according to the electric vehicle running a predetermined basic mileage, so that the electric vehicle can complete the basic mileage through the basic matching electric quantity, wherein the basic mileage is defined as the basic mileage according to the total mileage of the electric vehicle that can be run between the completion of the previous charging operation and the next time when the charging operation is needed again, and the basic mileage is pre-set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers; Step S3: At least one second cavity is provided inside the vehicle body of the electric vehicle for installing at least one range-extending battery pack after the electric vehicle is shipped from the factory according to the use requirement of the electric vehicle, and when each of the range-extending battery pack is selected to be installed in the at least one second cavity, each of the range-extending battery pack is able to be electrically connected with the basic battery pack and integrated into a complete battery pack to provide the total power required by the electric vehicle; wherein each of the range-extending battery pack is provided with a range-extending matching electric quantity according to a predetermined range-extending mileage that the electric vehicle is able to travel, so that the electric vehicle is able to complete the range-extending mileage by using the range-extending matching electric quantity, wherein the range-extending mileage is defined as the total mileage that the range-extending battery pack of the electric vehicle is able to travel from the completion of the previous charging operation to the next time when the charging operation is needed to be performed again, and the range-extending mileage is pre-set to be any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers; Step S4: According to the use requirement of the electric vehicle, each of the range-extending battery pack is selected and installed in the second cavity of the electric vehicle, so that the electric vehicle is able to complete the total mileage of the basic mileage and each of the range-extending mileage by integrating the basic battery pack and each of the range-extending battery pack to achieve the range-extending function.

7. A battery system of an extended-range electric vehicle, characterized by comprising: A first cavity is provided inside the vehicle body of the electric vehicle for installing a basic battery pack before the electric vehicle is shipped from the factory, so that the electric vehicle is able to travel a predetermined but relatively small basic mileage, and at least one second cavity is provided inside the vehicle body of the electric vehicle for selecting and installing at least one range-extending device after the electric vehicle is shipped from the factory according to the use requirement to increase at least one range-extending mileage; wherein when the electric vehicle is selected to install the at least one range-extending device, each of the range-extending device is able to be started to be electrically connected with the basic battery pack and integrated into a complete battery pack, so that the electric vehicle is able to complete the total mileage of the basic mileage and each of the range-extending mileage by using the complete battery pack to achieve the range-extending function.

8. The battery system of claim 7, wherein, The basic battery pack is provided with a basic matching electric quantity according to a predetermined basic mileage of the electric vehicle so that the electric vehicle can complete the basic mileage by the basic matching electric quantity. The basic mileage is defined as the total mileage that the basic battery pack of the electric vehicle can run between the completion of the previous charging operation and the next charging operation, and the basic mileage is set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers. Each range-extending device is provided with a range-extending device capable of generating a range-extending matching electric quantity according to a predetermined range-extending mileage of the electric vehicle so that the electric vehicle can complete the range-extending mileage by the range-extending matching electric quantity generated by the range-extending device. The range-extending mileage is defined as the total mileage that the range-extending device of the electric vehicle can run between the previous generation of range-extending matching electric quantity and the next generation of range-extending matching electric quantity, and the range-extending mileage is set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers.

9. The battery system of claim 7, wherein, The setting position of each second cavity in the vehicle body of the electric vehicle is different from that of the first cavity.

10. The battery system of claim 7, wherein, Each second cavity is arranged in the interior of the rear or front compartment of the electric vehicle.

11. The battery system 4 of claim 7, wherein, Each range-extending device is selected from one or a combination of more than one of a battery pack, a fuel cell, and an internal combustion engine generator.

12. The battery system of claim 7, wherein, Each range-extending device is further provided with at least one control switch for controlling the opening or closing of the electrical connection between each range-extending device and the basic battery pack.

13. A method for extending the range of an electric vehicle, comprising: The method comprises the following steps: Step S1: dividing the battery pack required by an electric vehicle into a basic battery pack and at least one range-extending device; Step S2: arranging a first cavity in the vehicle body of the electric vehicle for installing the basic battery pack before the electric vehicle is delivered from the factory. The basic battery pack is provided with a basic matching electric quantity according to a predetermined basic mileage of the electric vehicle so that the electric vehicle can complete the basic mileage by the basic matching electric quantity. The basic mileage is defined as the total mileage that the basic battery pack of the electric vehicle can run between the completion of the previous charging operation and the next charging operation, and the basic mileage is set to any mileage between 50-500 kilometers with a tolerance of 5-30 kilometers. Step S3: At least one second cavity is arranged inside the vehicle body of the electric vehicle for installing at least one range-extending device after the electric vehicle is delivered from the factory according to the needs of the electric vehicle: wherein each range-extending device is arranged according to a predetermined range-extending distance that the electric vehicle can travel to correspond to a range-extending device that can generate a range-extending matching power for the electric vehicle to complete the range-extending distance through the range-extending matching power generated by the range-extending device, wherein the range-extending distance is defined according to the total distance that the electric vehicle can travel between the time when the range-extending device generates the range-extending matching power for the last time and the time when the range-extending device needs to generate the range-extending matching power again The range-extending distance is between 50-500 kilometers and the allowable margin is 5-30 kilometers; wherein when each range-extending device is selected to be installed in each second cavity, the range-extending matching power generated by each range-extending device can be electrically connected with the basic battery pack and integrated into a complete battery pack to provide the electric vehicle with the required power; Step S4: According to the needs of the electric vehicle, each range-extending device is selected and installed in the at least one second cavity of the electric vehicle, so that the electric vehicle completes the total distance of the basic distance and each range-extending distance through the integration of the basic matching power of the basic battery pack and each range-extending matching power generated by each range-extending device to achieve the range-extending function.

14. The range extending method of claim 13, wherein, Each range-extending device is selected from one or a combination of more than two of the following: a battery pack, a fuel cell, and an internal combustion engine power generation device.

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