Power battery modules and vehicles

Abstract

The present invention discloses a power battery module and a vehicle, which belongs to the field of power battery technology and is designed to solve the problems of poor safety of existing battery modules. The power battery module of the present invention includes an upper box cover, a lower box body, a thermal management system, an electrical system, a thermal runaway protection system and an energy storage unit. The upper box cover and the lower box body are enclosed to form a cavity. The energy storage unit includes a battery cell. The lower box body includes a sealed frame and a bottom plate. The bottom plate includes an upper plate, a lower plate and a reinforcing rib. The reinforcing rib is connected between the upper plate and the lower plate. A first exhaust hole is provided in the middle of the upper plate, and a second exhaust hole is provided at the edge of the upper plate. The power battery module and the vehicle of the present invention can achieve the purpose of no fire or explosion in the state of thermal runaway of the battery, and improve the integration and safety while improving the energy density of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a power battery module and a vehicle comprising the power battery module. Background Art

[0002] Electric vehicles are a type of transportation powered by batteries, which have the advantages of energy saving, environmental protection and low cost. Currently, the more commonly used power batteries include three types of cells: square, soft pack and cylindrical. Compared with square and soft pack cells, cylindrical cells have a fast production rate, low cost, and the supporting production and testing equipment are more complete, so cylindrical cells can be quickly mass-produced and expanded.

[0003] The existing battery modules including cylindrical cells are usually arranged in parallel with a gap between adjacent cylindrical cells. The two ends of the cell unit are provided with a heat-conducting skeleton, which has a plurality of heat-conducting through holes, and the heat-conducting through holes correspond to the single cylindrical cells one by one. A serpentine tube is provided on the heat-conducting skeleton, and the coolant flows through the serpentine tube to cool the battery module and avoid accidents such as explosion of the battery module due to high temperature.

[0004] The defects of existing battery modules include at least the following: the box and thermal runaway protection system have simple structures, and cannot protect the safety of adjacent battery cells when individual battery cells explode due to overheating, thereby reducing the overall safety and service life of the battery module. Summary of the invention

[0005] An object of the present invention is to provide a power battery module with higher safety.

[0006] Another object of the present invention is to provide a vehicle that is safer to use.

[0007] To achieve this object, on the one hand, the present invention adopts the following technical solutions:

[0008] A power battery module comprises an upper box cover, a lower box body, a thermal management system, an electrical system, a thermal runaway protection system and an energy storage unit, wherein the upper box cover and the lower box body enclose a cavity for accommodating the thermal management system, the electrical system, the thermal runaway protection system and the energy storage unit, the energy storage unit comprises a battery cell, the lower box body comprises a sealed frame and a bottom plate, the bottom plate comprises an upper plate, a lower plate and reinforcing ribs, the reinforcing ribs are connected between the upper plate and the lower plate, a first exhaust hole is arranged in the middle of the upper plate, and a second exhaust hole is arranged at the edge of the upper plate.

[0009] In particular, the thermal runaway protection system comprises a heat shield made of phlogopite or muscovite mica, and the heat shield is located between the top of the battery cell and the bottom of the upper box cover.

[0010] In particular, the energy storage unit also includes a mounting bracket for fixing the battery cell, and the mounting bracket includes a battery cell fixing portion and a water pipe limiting groove; a positive pole is provided on the top of the battery cell, and an explosion-proof valve is provided on the bottom of the battery cell; the battery cell is a cylindrical battery cell, and the first exhaust hole is a circular hole, and the diameter of the first exhaust hole is larger than the diameter of the explosion-proof valve and smaller than the diameter of the battery cell body.

[0011] In particular, a heat-conducting structural adhesive is filled between the battery core fixing portion and the battery core, and a heat-conducting structural adhesive flow guide port is opened on the mounting bracket, and the heat-conducting structural adhesive flow guide port is connected to the adjacent battery core fixing portion.

[0012] In particular, the upper box cover and the lower box body are connected by bolts, and a sealing rubber ring is arranged between the upper box cover and the lower box body.

[0013] In particular, the upper box cover is made of composite materials such as PCM, SMC, third-series or fifth-series aluminum alloy, or sheet metal.

[0014] In particular, the thermal management system includes a serpentine pipe and a manifold, and the serpentine pipe and the manifold are connected to form a channel for circulating the cooling liquid.

[0015] In particular, the serpentine tube is in contact with the battery core.

[0016] In particular, the electrical system comprises a high voltage current carrying connection bar and a low voltage control system, and the low voltage control system comprises a low voltage wiring harness and a BMS.

[0017] On the other hand, the present invention adopts the following technical solutions:

[0018] A vehicle comprises a vehicle body and the above-mentioned power battery module, wherein the power battery module is detachably mounted on the vehicle body.

[0019] The bottom plate of the power battery module of the present invention is a double-layer structure and exhaust holes are provided on the layer plates. When thermal runaway occurs, the gas generated by the battery cell flows out from the cavity between the upper layer plate and the lower layer plate, and then enters the battery pack, and then overflows through the explosion-proof valve arranged on the frame, so as to achieve the purpose of preventing fire and explosion in the state of thermal runaway of the battery, providing passengers with sufficient escape time, and significantly improving the system energy density while improving the integration and safety, with low cost, good thermal runaway protection effect, long service life, and safety and reliability.

[0020] The vehicle of the present invention includes the above-mentioned power battery module. When individual battery cells are in thermal runaway, high-temperature and high-pressure gas can be quickly discharged to avoid overheating of the entire power battery module to cause damage or explosion. The vehicle is safer to use, has low cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of a power battery module provided by a specific embodiment of the present invention;

[0022] Figure 2 is an exploded view of a lower box provided in a specific embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a base plate provided in a specific embodiment of the present invention;

[0024] Figure 4 is an exploded diagram of an energy storage unit provided in a specific embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of a mounting bracket provided in a specific embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of a battery cell provided in a specific embodiment of the present invention;

[0027] Figure 7 It is a schematic structural diagram of an explosion-proof valve of a battery cell provided in a specific embodiment of the present invention;

[0028] Figure 8 and Fig. 9 All of them are structural schematic diagrams of thermal management systems provided by specific embodiments of the present invention.

[0029] In the figure:

[0030] 1. Upper box cover; 2. Lower box body; 3. Thermal management system; 4. Heat insulation board; 5. Energy storage unit; 21. Frame; 22. Bottom plate; 31. Serpentine tube; 32. Manifold; 51. Battery cell; 52. Mounting bracket; 221. Upper plate; 222. Lower plate; 223. Reinforcement rib; 224. First exhaust hole; 225. Second exhaust hole; 511. Positive pole; 512. Explosion-proof valve; 521. Battery cell fixing part; 522. Water pipe limit groove. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] This embodiment provides a power battery module and a vehicle including the power battery module. Specifically, the vehicle includes a vehicle body, and the power battery module is detachably mounted on the vehicle body. Figure 1 As shown, the power battery module includes an upper box cover 1, a lower box body 2, a thermal management system 3, an electrical system, a thermal runaway protection system and an energy storage unit 5. The upper box cover 1 and the lower box body 2 enclose a cavity, and the thermal management system 3, the electrical system, the thermal runaway protection system and the energy storage unit 5 are all arranged in the cavity. The upper box cover 1 and the lower box body 2 can jointly protect the power battery module. The energy storage unit 5 includes a battery cell 51.

[0038] like Figure 2 and Figure 3 As shown, the lower box body 2 as the main load-bearing unit includes a sealed frame 21 and a bottom plate 22, wherein the bottom plate 22 is made of aluminum ingots through extrusion and machining. The bottom plate 22 includes an upper plate 221, a lower plate 222 and a reinforcing rib 223, and the reinforcing rib 223 is connected between the upper plate 221 and the lower plate 222. The lower plate 222 and the frame 21 are sealed by stir friction welding and MIG welding, etc., meeting the protection requirements of IP67. A plurality of first exhaust holes 224 are provided in the middle of the upper plate 221, and a plurality of second exhaust holes 225 are provided at the edge of the upper plate 221. In order to ensure the stability of the installation of the battery cell 51, the axis of the first exhaust hole 224 coincides with the axis of the battery cell 51, that is, after installation, the bottom edge of the battery cell 51 is just stuck on the edge of the first exhaust hole 224. Among them, the lower box body 2 is preferably made of a six-series aluminum alloy through an extrusion molding process and through machining and welding.

[0039] The bottom plate 22 of the power battery module includes an upper plate 221, a lower plate 222 and a reinforcing rib 223, and a first exhaust hole 224 and a second exhaust hole 225 are provided on the upper plate 221. When thermal runaway occurs, the gas generated by the battery cell 51 flows out from the cavity between the upper plate 221 and the lower plate 222, and then enters the battery pack, and then overflows through the explosion-proof valve provided on the frame 21, so as to achieve the purpose of preventing the battery from catching fire or exploding in the state of thermal runaway, providing passengers with sufficient escape time, significantly improving the energy density of the system while improving high integration and safety, low cost, good thermal runaway protection effect, long service life, and safety and reliability. The battery cell 51 is preferably a cylindrical battery cell, which has low cost, high energy density and high production efficiency.

[0040] The specific shape of the first exhaust hole 224 is not limited, as long as it can accommodate the bottom of the battery cell 51. When the battery cell 51 is a cylindrical battery cell, the first exhaust hole 224 is circular; when the battery cell 51 is a square battery cell, the first exhaust hole 224 is square; other shapes are similar. The specific shape of the second exhaust hole 225 is not limited, as long as it can exhaust hot air, preferably circular, rectangular and triangular, and can also be designed into an irregular shape according to the shape and area of ​​the usable area at the edge of the upper plate 221.

[0041] The thermal runaway protection system includes a heat insulation board 4 made of phlogopite or muscovite mica, and the heat insulation board 4 is located between the top of the battery cell 51 and the bottom of the upper case cover 1. To be precise, the heat insulation board 4 cooperates with the first exhaust hole 224, the second exhaust hole 225 and the explosion-proof valve on the frame 21 to form a thermal runaway protection system. The heat insulation board 4 mainly plays the role of heat insulation and flame retardancy, and can effectively prevent the heat generated by the battery cell 51 from being quickly transferred to the upper case cover 1 during thermal runaway, slowing down or preventing the upper case cover 1 from being ruptured due to thermal shock, making the power battery module safer to use. The heat insulation board 4 is preferably a mica board with a thickness of 1-1.5 mm, which has high mechanical strength and meets the performance requirements of the power battery module under various operating conditions.

[0042] Based on the above structure, Figures 4 to 7As shown, the energy storage unit 5 also includes a mounting bracket 52 for fixing the battery cell 51, wherein the battery cell 51 is a core element for storing and providing energy. The mounting bracket 52 includes a battery cell fixing portion 521 and a water pipe limiting groove 522, the battery cell 51 is arranged in the battery cell fixing portion 521, and the cooling pipeline is arranged in the water pipe limiting groove 522, which is used to cool the battery cell 51. A positive pole 511 is arranged on the top of the battery cell 51, and an explosion-proof valve 512 is arranged on the bottom of the battery cell 51. The battery cell 51 is preferably a cylindrical battery cell, and the first exhaust hole 224 is preferably a circular hole, and the diameter of the circular first exhaust hole 224 is larger than the diameter of the explosion-proof valve 512 and smaller than the diameter of the cylindrical battery cell 51 body. The explosion-proof valve 512 is arranged at the bottom of the battery cell 51, and when thermal runaway occurs, the gas flows out from the bottom of the battery cell 51 to prevent the gas from directly impacting the upper box cover 1, which is safer to use and has high production efficiency.

[0043] In order to improve the stability of the battery cell 51 after installation, a thermal conductive structural adhesive is filled between the battery cell fixing portion 521 and the battery cell 51. The thermal conductive structural adhesive is formed by mixing two kinds of glue when in use, and has excellent thermal conductivity and structural strength. The specific materials of the two kinds of glue used to form the thermal conductive structural adhesive are not limited, and any glue that can simultaneously play a role of heat conduction and bonding in the prior art can be used. In order to meet the requirements of mechanical force and structural strength, the thermal conductivity of the thermal conductive structural adhesive is preferably 1.3-1.8w / mk.

[0044] The mounting bracket 52 is provided with a heat-conducting structural adhesive flow guide port, which is connected to the adjacent battery cell fixing portion 521, so that the heat-conducting structural adhesive can flow smoothly in the energy storage unit 5, thereby filling the interior of the entire energy storage unit 5, making the battery cell 51 more stably installed. In addition, the heat-conducting structural adhesive can transfer the heat generated by thermal runaway of a single battery cell 51 to the entire power battery module, preventing heat diffusion caused by heat accumulation, and making it safer to use. The mounting bracket 52 is preferably composed of PC and glass fiber, which has low cost and high production efficiency.

[0045] On the basis of the above structure, the upper box cover 1 and the lower box body 2 are connected by bolts. Specifically, the edge of the upper box cover 1 is a flange structure, and a through hole is formed on the flange by machining. The frame of the lower box body 2 is correspondingly provided with a through hole, and the through hole of the upper box cover 1 and the through hole of the lower box body 2 are connected by bolts.

[0046] A sealing rubber ring is provided between the upper box cover 1 and the lower box body 2. During installation, the upper box cover 1 and the lower box body 2 are tightly buckled together to squeeze the sealing rubber ring therebetween, thereby ensuring that there is no gap between the upper box cover 1 and the lower box body 2, and the sealing is better.

[0047] The upper box cover 1 is preferably made of composite material PCM, SMC, three-series or five-series aluminum alloy, or sheet metal material through die pressing, with high strength and light weight. Preferably, the thickness of PCM is 0.8-1.5mm or 1-3mm, the thickness of SMC material is 3-5mm or 1-3mm, the thickness of aluminum alloy material is 0.8-1.2mm, and the thickness of sheet metal material is 0.8-1.2mm.

[0048] like Figure 8 and Fig. 9 As shown, the thermal management system 3 includes a serpentine tube 31 and a manifold 32. The serpentine tube 31 and the manifold 32 are welded together, and the insides thereof are connected to form a channel for circulating a coolant, and the coolant is used to cool the battery cell 51. The start and stop of the thermal management system 3 is precisely controlled by the battery management system to ensure that the temperature of the battery cell is always within a reasonable use range.

[0049] A water pipe limiting groove 522 is provided on the side of the mounting bracket 52, and the end of the serpentine tube 31 is stuck in the water pipe limiting groove 522. The main body of the serpentine tube 31 is located inside the mounting bracket 52, and the serpentine tube 31 is in contact with the battery cell 51. The water pipe limiting groove 522 serves as an installation limit and guide for the serpentine tube 31. After being filled with heat-conducting structural glue, the serpentine tube 31 is firmly fixed in the mounting bracket 52, and the heat conduction effect is better.

[0050] Each power battery module includes a plurality of battery cells 51 arranged as a whole, and the serpentine tube 31 is located between the battery cells 51. Each battery cell 51 contacts the serpentine tube 31 at least once, and the heat conductive structural glue is filled between the battery cell 51 and the serpentine tube 31, which fixes the battery cell 51 and the serpentine tube 31 together while ensuring good heat transfer capability, having an excellent temperature equalization effect, and is conducive to improving the cycle life of the power battery module.

[0051] When the battery cell 51 is overheated, the heat of the battery cell 51 is transferred to the heat conductive structural glue and the serpentine tube 31 in turn, and the heat is taken out by the coolant flowing in the serpentine tube 31; when the temperature of the battery cell 51 is low, the heat is transferred in the reverse direction in the same path. The coolant is preferably a mixture of ethylene glycol and water, which has low cost and high cooling efficiency.

[0052] Based on the above structure, the electrical system includes a high-voltage current-carrying connection bar and a low-voltage control system, and the low-voltage control system includes a low-voltage wiring harness and BMS (abbreviation of BATTERY MANAGEMENT SYSTEM). The electrical system can transmit current and effectively collect information such as voltage and temperature. Precise management by BMS can ensure the safe and efficient operation of the battery system.

[0053] The working principle of the power battery module: when a battery cell 51 experiences thermal runaway, the high-temperature and high-pressure gas generated by the battery cell 51 is ejected from the explosion-proof valve 512 at the bottom thereof, and the gas enters the cavity between the upper plate 221 and the lower plate 222 through the first exhaust hole 224 of the bottom plate 22, and then is discharged to the interior of the power battery module through the second exhaust hole 225 at the edge of the upper plate 221; in the case of a sudden increase in pressure, the explosion-proof valve set on the frame 21 of the lower box 2 opens, and the high-temperature and high-pressure gas is ejected from the explosion-proof valve, effectively slowing down the pressure and temperature rise rate inside the power battery module. The mica board as a thermal runaway protection system has the function of flame retardancy and heat insulation, which can greatly reduce the risk of thermal diffusion in the power battery module and improve the safety of the power battery module.

[0054] The production process of the power battery module:

[0055] The first step is to manufacture the energy storage unit 5 and the thermal management system 3. Place the plastic mounting bracket 52 upside down on a horizontal work station, insert the serpentine tube 31 into the water pipe limit groove 522, and invert the battery cells 51 one by one (with the explosion-proof valve 512 facing upward) in the battery cell fixing part 521, and apply adhesive with poor fluidity but high bonding strength to the bottom of the battery cell 51 and the bottom of the mounting bracket 52. Turn the mounting bracket 52, serpentine tube 31 and battery cell 51 over as a whole to form a positive position with the explosion-proof valve 512 facing downward. Weld high-voltage guide bars (i.e., high-voltage current-carrying connection bars) such as BUSBAR and low-voltage wiring harnesses, and fill the thermal conductive structural adhesive from the front of the mounting bracket 52.

[0056] In the second step, the energy storage unit 5 and the thermal management system 3 are placed in the lower box body 2, and the overall structure of the energy storage unit 5 and the thermal management system 3 is fixedly connected to the lower box body 2 through connectors.

[0057] The third step is to install electrical components such as BDU and BMS, and fix the low-voltage wiring harness and high-voltage copper busbar.

[0058] The fourth step is to install the explosion-proof valve, mica board and sealing ring for the battery box, and then install the box cover 1.

[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power battery module, comprising an upper box cover (1), a lower box body (2), a thermal management system (3), an electrical system, a thermal runaway protection system and an energy storage unit (5), wherein the upper box cover (1) and the lower box body (2) enclose a cavity for accommodating the thermal management system (3), the electrical system, the thermal runaway protection system and the energy storage unit (5), and the energy storage unit (5) comprises a battery cell (51), characterized in that: The lower box body (2) comprises a frame (21) and a bottom plate (22) which are sealed and connected, the bottom plate (22) comprises an upper plate (221), a lower plate (222) and a reinforcing rib (223), the reinforcing rib (223) being connected between the upper plate (221) and the lower plate (222), a first exhaust hole (224) being provided in the middle of the upper plate (221), and a second exhaust hole (225) being provided at the edge of the upper plate (221); A positive pole (511) is arranged on the top of the battery cell (51), and an explosion-proof valve (512) is arranged on the bottom of the battery cell (51); The axis of the first exhaust hole (224) coincides with the axis of the battery core (51); When thermal runaway occurs, the gas generated by the battery cell (51) enters the cavity between the upper plate (221) and the lower plate (222) through the first exhaust hole (224), and then flows into the battery module through the second exhaust hole (225).

2. The power battery module according to claim 1, characterized in that: The thermal runaway protection system comprises a heat insulation board (4) made of phlogopite or muscovite mica, and the heat insulation board (4) is located between the top of the battery cell (51) and the bottom of the upper box cover (1).

3. The power battery module according to claim 1, characterized in that: The energy storage unit (5) further comprises a mounting bracket (52) for fixing the battery cell (51), the mounting bracket (52) comprising a battery cell fixing portion (521) and a water pipe limiting groove (522); the battery cell (51) is a cylindrical battery cell, the first exhaust hole (224) is a circular hole, and the diameter of the first exhaust hole (224) is greater than the diameter of the explosion-proof valve (512) and smaller than the diameter of the battery cell (51) body.

4. The power battery module according to claim 3, characterized in that: A heat-conducting structural adhesive is filled between the battery core fixing portion (521) and the battery core (51), and a heat-conducting structural adhesive flow guide port is provided on the mounting bracket (52), and the heat-conducting structural adhesive flow guide port is connected to the adjacent battery core fixing portion (521).

5. The power battery module according to any one of claims 1 to 4, characterized in that: The upper box cover (1) and the lower box body (2) are connected by bolts, and a sealing rubber ring is provided between the upper box cover (1) and the lower box body (2).

6. The power battery module according to any one of claims 1 to 4, characterized in that: The upper box cover (1) is made of composite materials such as PCM, SMC, third-series or fifth-series aluminum alloy, or sheet metal.

7. The power battery module according to any one of claims 1 to 4, characterized in that: The thermal management system (3) comprises a serpentine tube (31) and a manifold (32); the serpentine tube (31) and the manifold (32) are connected to form a channel for circulating a cooling liquid.

8. The power battery module according to claim 7, characterized in that: The serpentine tube (31) is in contact with the battery core (51).

9. The power battery module according to any one of claims 1 to 4, characterized in that: The electrical system includes a high-voltage current-carrying connection bar and a low-voltage control system, and the low-voltage control system includes a low-voltage wiring harness and a BMS.

10. A vehicle, comprising a vehicle body, characterized in that: It also includes a power battery module as described in any one of claims 1 to 9, wherein the power battery module is detachably mounted on the vehicle body.

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