Bottom protection plate of electric vehicle and method for replacing battery

Abstract

The invention discloses a bottom protection plate of an electric vehicle. The bottom protection plate comprises a battery bottom protection plate; the battery bottom protection plate can move relative to the battery and longitudinally move along the vehicle body; the battery bottom protection plate comprises a front battery bottom protection plate and a rear battery bottom protection plate; the front battery bottom protection plate and / or the rear battery bottom protection plate comprise / comprises a battery bottom protection plate body and a guide rail assembly; the battery bottom protection plate body is fixed to the guide rail assembly through the guide rail, and the battery bottom protection plate body moves in the direction of the guide rail through the motor assembly. Through the arrangement of the battery bottom protection plate, the battery bottom protection plate can move relative to the battery, the problem that gaps exist between the front end and the rear end of the battery and a traditional bottom protection plate of a battery replacement electric vehicle, and consequently wind resistance is large is solved, the whole vehicle wind resistance requirement is met, the whole vehicle wind resistance is reduced, battery power consumption is reduced, the bottom of an automobile is covered more completely, and the appearance is attractive and harmonious. The invention further discloses a method for replacing the battery of the electric vehicle using the bottom protection plate.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle manufacturing, and particularly relates to a bottom guard plate of an electric vehicle and a method for replacing a battery. Background Art

[0002] With the development of the industrialization of electric vehicles, in order to solve the problem of low cruising range of electric vehicles, a more efficient and flexible battery swapping technology has emerged. Since the battery swapping AGV automatic trolley in the existing market needs to replace and lift the battery, there must be a certain gap between the bottom guard plate and the battery component. Otherwise, the battery swapping tool will interfere with the bottom guard plate, resulting in no operating space and unable to perform the battery swapping operation. Because the bottom guard plate cannot be connected to the front and rear ends of the battery in a zero-contact manner, there is a gap of about 100 - 300 mm between the bottom guard plate and the battery. This gap will increase the wind resistance of the whole vehicle by about 8 - 10 count, and reduce the battery cruising range by about 4 - 8 Km. Summary of the Invention

[0003] In view of this, the present invention provides a bottom guard plate of an electric vehicle, which solves the problems that there are large gaps between the front and rear ends of the battery of a battery swapping electric vehicle and the traditional bottom guard plate, resulting in large wind resistance, incomplete bottom coverage, and unattractive appearance.

[0004] The present invention also provides a method for replacing a battery of an electric vehicle using the above bottom guard plate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bottom guard plate of an electric vehicle, comprising: a battery bottom guard plate;

[0007] The battery bottom guard plate can move relative to the battery, and the battery bottom guard plate includes: a front battery bottom guard plate and a rear battery bottom guard plate;

[0008] The front battery bottom guard plate and / or the rear battery bottom guard plate includes: a battery bottom guard plate body and a guide rail assembly; the battery bottom guard plate body is fixed to the guide rail assembly through a guide rail, and the battery bottom guard plate body moves along the direction of the guide rail through a motor assembly.

[0009] Preferably, the guide rail assembly includes: a left guide rail assembly and a right guide rail assembly;

[0010] The left guide rail assembly is fixed to the left body bracket, and the right guide rail assembly is fixed to the right body bracket;

[0011] The guide rail includes: a left guide rail and a right guide rail;

[0012] The left guide rail and the right guide rail are respectively matched with both sides of the battery bottom guard plate body.

[0013] Preferably, the battery bottom guard body includes: a first guard body;

[0014] The motor assembly includes: a motor fixing plate;

[0015] The first guard body is fixed to the motor fixing plate by bolts, and forms a small assembly with the motor assembly and is fixed to the guide rail assembly together.

[0016] Preferably, the motor assembly further includes: a motor and an output shaft;

[0017] Both the motor and the output shaft are arranged on the motor fixing plate, and the motor drives the gear set of the guide rail assembly to rotate through the output shaft.

[0018] Preferably, the front battery bottom guard and the rear battery bottom guard are symmetric about the front and rear of the battery.

[0019] Preferably, the first guard body is provided with a limit bushing, and the limit bushing is used to cooperate with the limit member of the battery.

[0020] Preferably, the number of the limit bushings is 2, and the 2 limit bushings are symmetrically distributed longitudinally with respect to the first guard body.

[0021] Preferably, the limit bushing is a rubber bushing.

[0022] Preferably, the limit member is a ball head screw, and the ball head screw is arranged on the side edge of the battery body.

[0023] A method for replacing a battery of an electric vehicle, using the above bottom guard, includes the steps:

[0024] S1. The battery bottom guard moves relative to the battery to leave a space for the replacement tooling;

[0025] S2. In the space for the replacement tooling, the battery is replaced;

[0026] S3. After the battery replacement is completed, the battery bottom guard moves relative to the battery to close the space for the replacement tooling.

[0027] As can be seen from the above technical solutions, for the bottom guard of the electric vehicle provided by the present invention, through the setting of the battery bottom guard, the battery bottom guard can move relative to the battery, solving the problem that there are gaps between the front and rear ends of the battery of the battery replacement electric vehicle and the traditional bottom guard, resulting in a large wind resistance, meeting the wind resistance requirements of the whole vehicle, reducing the wind resistance of the whole vehicle, thereby reducing the battery power consumption, further improving the mileage of the whole vehicle, improving the intelligent design level of the exterior of the whole vehicle, making the bottom of the vehicle more fully covered, and the appearance is beautiful and coordinated;

[0028] This solution also has the front battery bottom guard plate and the rear battery bottom guard plate symmetrically distributed about the vehicle body in the lateral direction. Both the front battery bottom guard plate and the rear battery bottom guard plate can move relative to the battery, ensuring that when a mechanical failure occurs in one of the battery bottom guard plates, the battery replacement is not affected.

[0029] The present invention also provides a method for replacing the battery of an electric vehicle. Due to the adoption of the bottom guard plate of the above-mentioned electric vehicle, it also has corresponding beneficial effects. For specific details, reference can be made to the previous description and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the overall structure of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the assembly of the battery front guard plate and other parts of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the bottom guard plate body of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0034] Figure 3a For Figure 3 partial cross-sectional view;

[0035] Figure 4 It is an axonometric structural schematic diagram of the left guide rail assembly of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0036] Figure 4a For Figure 4 cross-sectional view;

[0037] Figure 4b For Figure 4a partial cross-sectional view;

[0038] Figure 5 It is an axonometric structural schematic diagram of the motor assembly of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0039] Figure 5a It is a structural schematic diagram of the cooperation between the motor assembly and the left guide rail assembly of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0040] Figure 6 Isometric structural schematic diagram of the battery of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0041] Figure 6a Is Figure 6 Partial cross-sectional view;

[0042] Figure 7 First installation schematic diagram of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0043] Figure 8 Second installation schematic diagram of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0044] Figure 9 Schematic diagram of the output shaft section of the motor of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0045] Figure 10 Cross-sectional view of the ball screw fixation of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention;

[0046] Figure 11 System software control schematic diagram of the bottom guard plate of the electric vehicle provided by the embodiment of the present invention.

[0047] 1 is the front bumper bottom guard plate;

[0048] 2 is the front subframe bottom guard plate;

[0049] 3 is the front bottom guard plate of the battery, 3.1 is the bottom guard plate body, 3.1.1 is the first guard plate body, 3.12 is the rubber bushing, 3.2 is the left guide rail assembly, 3.2.1 is the guide rail outer skeleton, 3.2.2 is the guide rail inner skeleton, 3.2.3 is the gear set, 3.2.4 is the guide rail, 3.2.5 is the guide rail bracket, 3.2.6 is the rivet, 3.3 is the right guide rail assembly, 3.4 is the motor assembly, 3.4.1 is the motor, 3.4.2 is the wire harness and connector, 3.4.3 is the output shaft, 3.4.4 is the motor fixing plate, 3.4.5 is the first blind rivet nut, 3.5 is the left body bracket, 3.6 is the lower body, 3.7 is the right body bracket, 3.8 is the battery, 3.8.1 is the battery body, 3.8.2 is the ball screw, 3.8.3 is the second blind rivet nut, 3.9 is the controller;

[0050] 4 is the rear bottom guard plate of the battery; 5 is the rear subframe bottom guard plate; 6 is the rear bumper bottom guard plate. Detailed implementation manners

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] A bottom guard plate for an electric vehicle provided by an embodiment of the present invention includes: a battery bottom guard plate, and its specific structure can be referred to Figures 1 - 3a ;

[0053] Among them, the battery bottom guard plate can move relative to the battery, and the battery bottom guard plate moves along the longitudinal direction of the vehicle body, and its longitudinal direction of the vehicle body is Figure 8 the front-rear direction of the vehicle;

[0054] The battery bottom guard plate includes: a front battery bottom guard plate and a rear battery bottom guard plate;

[0055] The front battery bottom guard plate and / or the rear battery bottom guard plate includes: a battery bottom guard plate body and a guide rail assembly; the battery bottom guard plate body is fixed to the guide rail assembly through the guide rail, and the battery bottom guard plate body moves along the direction of the guide rail through the motor assembly. Among them, the specific structure of the motor assembly is as Figure 5 shown; in this solution, the motor assembly provides a power source for the movement of the battery bottom guard plate.

[0056] In this solution, the battery bottom guard plate can move relative to the battery. When the battery needs to be replaced, the battery bottom guard plate and the battery are separated, and the battery bottom guard plate moves away from the battery to reach a separated state, leaving a space for the replacement tooling to replace the battery, which can be referred to Figure 8 shown; when the battery replacement is completed, the battery bottom guard plate moves towards the battery until the battery bottom guard plate and the battery are in zero-contact connection, which can be referred to Figure 10 shown; compared with the prior art (after replacing the battery of an electric vehicle, there are gaps between the front and rear ends of the battery and the traditional bottom guard plate, resulting in large wind resistance, incomplete bottom coverage, and unaesthetic appearance, etc.), this solution solves the problem of large wind resistance caused by the gaps between the front and rear ends of the battery and the traditional bottom guard plate of the battery-swapping electric vehicle, meets the wind resistance requirements of the whole vehicle, reduces the wind resistance of the whole vehicle, thereby reducing the battery power consumption, further improving the mileage of the whole vehicle, improving the intelligent design level of the exterior of the whole vehicle, making the bottom of the vehicle more fully covered, and having a beautiful and harmonious appearance.

[0057] In the above solution, when the battery needs to be replaced, the battery bottom guard plate moves relative to the battery along the front direction of the vehicle. When the battery replacement is completed, the battery bottom guard plate moves relative to the battery along the rear direction of the vehicle; such a setting makes the space occupied the smallest when replacing the battery, and at the same time is beneficial to the zero-contact connection between the battery bottom guard plate and the battery;

[0058] In the above solution, the front battery bottom guard plate and the rear battery bottom guard plate are symmetrically distributed about the vehicle body's transverse direction; it should be noted that both the front battery bottom guard plate and the rear battery bottom guard plate can move relative to the battery, ensuring that when a mechanical failure occurs in one side's battery bottom guard plate, the battery replacement is not affected;

[0059] In the above solution, the battery bottom guard plate body is fixed to the guide rail assembly through the guide rail. In this solution, the direction of the guide rail assembly is parallel to the vehicle body's longitudinal direction, the direction of the battery bottom guard plate body is perpendicular to the vehicle body's longitudinal direction, and the direction of the guide rail is parallel to the direction of the guide rail assembly; such a setting enables the battery bottom guard plate body to move along the guide rail on the guide rail assembly, realizing the movement of the battery bottom guard plate relative to the battery along the vehicle's front-back direction (such as Figure 8 the vehicle's front-back direction described).

[0060] Preferably, the guide rail assembly includes: a left guide rail assembly and a right guide rail assembly, and its specific structure can be referred to Figure 2 ;

[0061] Among them, the left guide rail assembly is fixed to the left vehicle body bracket, and the right guide rail assembly is fixed to the right vehicle body bracket;

[0062] The guide rail includes: a left guide rail and a right guide rail, and its specific structure can be referred to Figure 2 ;

[0063] Among them, the left guide rail and the right guide rail are respectively matched with both sides of the battery bottom guard plate body.

[0064] In this solution, through the cooperation of both sides of the battery bottom guard plate body with the left guide rail and the right guide rail, during the movement of the battery bottom guard plate body along the left guide rail assembly and the right guide rail assembly, both sides of the battery bottom guard plate body are simultaneously restricted in direction, making the movement process stable and solving the problem of direction deviation.

[0065] In this solution, the battery bottom guard plate body includes: a first guard plate body, and its specific structure can be referred to Figure 3 ;

[0066] The motor assembly includes: a motor fixing plate;

[0067] The first guard plate body is fixed to the motor fixing plate through bolts, forming a small assembly with the motor assembly and being fixed to the guide rail assembly together. The setting direction of the motor fixing plate is the same as the setting direction of the first guard plate body, and the setting direction of the motor fixing plate is perpendicular to the guide rail assembly, facilitating the movement of the first guard plate body; the first guard plate body being fixed to the motor fixing plate makes the bottom guard plate structure of this electric vehicle compact, and the movable connection through bolts is convenient for later separation and maintenance.

[0068] Furthermore, the motor assembly further includes: a motor and an output shaft, and for its specific structure, refer to Figure 5 ;

[0069] Wherein, both the motor and the output shaft are arranged on the motor fixing plate, and the motor drives the gear set of the guide rail assembly to rotate through the output shaft. In this solution, the motor provides a power source and drives the gear set of the guide rail assembly to rotate through the output shaft (such as Figure 5a ), and then the first guard plate body moves along the guide rail assembly.

[0070] Preferably, the front battery bottom guard plate and the rear battery bottom guard plate are symmetric about the front and rear of the battery, and its specific structure is as Figure 1 shown. With such a setting, it is beneficial to the stability of the overall structure and improves the battery replacement efficiency.

[0071] Specifically, the first guard plate body is provided with a limit bushing, and its specific structure Figure 3 and Figure 3a are shown. The limit bushing is used to cooperate with the limit part of the battery;

[0072] When the battery needs to be replaced, the limit bushing and the limit part are separated, and the battery bottom guard plate and the battery are separated; when the battery replacement is completed, the limit bushing and the limit part are tightly combined under the relative movement of the battery bottom guard plate with respect to the battery; it should be noted that the limit part of the battery is a ball head screw, and in actual cooperation, the separation and combination efficiency of the limit bushing and the ball head screw is high.

[0073] Preferably, the number of limit bushings is 2, and the 2 limit bushings are symmetrically distributed longitudinally with respect to the first guard plate body, as Figure 3 shown, providing constraints at 2 symmetric positions to ensure the stability of the structure.

[0074] Specifically, the limit bushing is a rubber bushing, and the cost of this rubber bushing is low.

[0075] Furthermore, the limit part is a ball head screw, and its specific structure can be referred to Figure 6 , and the ball head screw is a standard part, which is beneficial to reducing costs. The ball head screw is arranged on the side edge of the battery body to improve the battery replacement efficiency.

[0076] The embodiment of the present invention also provides a method for replacing the battery of an electric vehicle, which adopts the bottom guard plate of the electric vehicle as described above, and includes the steps:

[0077] S1. The battery bottom guard plate moves relative to the battery to leave a space for the replacement tooling;

[0078] S2. In the space for the replacement tooling, the battery is replaced;

[0079] S3. After the battery replacement is completed, the battery bottom guard plate moves relative to the battery to close the space for the replacement tooling.

[0080] The following further introduces this solution in combination with specific embodiments:

[0081] This technical solution provides an intelligent underbody panel control system for optimizing the wind resistance of battery-swapping electric vehicles, which is fixedly installed on the body sheet metal of the lower vehicle body. It involves the realization of the function of reducing wind resistance required during the use of electric vehicles that support battery-swapping strategies, and belongs to the field of automotive technology. The main function of the present invention is to optimize the wind resistance through the intelligent control of the underbody panel system, thereby meeting the wind resistance requirements of the whole vehicle. Reducing the wind resistance of the whole vehicle can reduce the battery power consumption, further increase the driving range of the whole vehicle, and improve the intelligent design level of the exterior of the whole vehicle. In addition, the intelligent underbody panel control system can be designed to cover the bottom of the vehicle more completely, with a beautiful and coordinated appearance.

[0082] The objectives of the present invention:

[0083] 1. Through the seamless design of the underbody panel system and the lower vehicle body, the wind resistance of the whole vehicle is optimized, achieving the purpose of equivalent cost reduction of the whole vehicle; the wind resistance of the whole vehicle is optimized by 5 - 10 counts, and the equivalent conversion into the maximum battery cost is about 1200 yuan;

[0084] 2. Through the automated design of the underbody panel system, the normal operation of the battery-swapping tooling is realized, and the integrity and wind resistance optimization of the underbody panel after battery swapping are also achieved;

[0085] 3. Through the seamless design of the underbody panel system and the lower vehicle body, the integrity of the vehicle bottom covering is realized, effectively protecting some parts such as wire harnesses and connectors, and with a better appearance perception.

[0086] The technical solution of the present invention:

[0087] The underbody panel system involved in the present invention includes the following parts

[0088] The underbody panel is generally installed on the lower vehicle body at the bottom of the vehicle, and generally consists of several major parts such as the front bumper underbody panel 1, the front subframe underbody panel 2, the front battery underbody panel 3, the rear battery underbody panel 4, the rear subframe underbody panel 5, and the rear bumper underbody panel 6. See Figure 1 shown;

[0089] The present invention focuses on the front battery underbody panel 3 and the rear battery underbody panel 4, and the others are all conventional underbody panel designs; the underbody panel is generally fixed to the vehicle body or the vehicle body bracket from bottom to top by bolts;

[0090] The front battery underbody panel 3 and the rear battery underbody panel 4 of the present invention are a set of underbody panel systems, which consist of two major parts: mechanical hardware components and software control. The present invention focuses on taking the front battery underbody panel 3 as an example for detailed description, and the structural design of the rear battery underbody panel 4 is basically the same as that of the front battery underbody panel 3;

[0091] The battery front bottom guard plate 3 system of the present invention comprises a bottom guard plate body 3.1, a left guide rail assembly 3.2, a right guide rail assembly 3.3, a motor assembly 3.4, a left body bracket 3.5, a lower body 3.6, a right body bracket 3.7, a battery 3.8, and a controller 3.9. Figure 2 As shown;

[0092] Technical effects of the above scheme:

[0093] 1. The battery front bottom guard plate and rear bottom guard plate system of the present invention realizes the reduction of the wind resistance coefficient of the battery-swap electric vehicle and the cost;

[0094] 2. The battery front bottom guard plate and rear bottom guard plate system of the present invention realizes the integrity of the bottom guard plate of the battery-swap electric vehicle and the protection of the chassis components;

[0095] 3. The battery front bottom guard plate and rear bottom guard plate system of the present invention automatically extend and retract the bottom guard plates to both sides during the battery replacement process of the electric vehicle, and automatically close again when the battery replacement is completed.

[0096] The specific technical solution of the present invention is:

[0097] The battery front bottom guard plate 3.1 of the present invention comprises a first guard plate body 3.1.1 and a rubber bushing 3.1.2, wherein the rubber bushing 3.1.2 is fixed to the body by insert injection molding; Figure 3 and Figure 3a ;

[0098] The left guide rail assembly 3.2 of the present invention comprises a guide rail outer frame 3.2.1, a guide rail inner frame 3.2.2, a gear set 3.2.3, a guide rail 3.2.4, a guide rail bracket 3.2.5, and a rivet 3.2.6; the components of the right guide rail assembly 3.3 are the same as those of the left guide rail assembly 3.2, so they are not described here. The specific structure is as follows Figures 4 - 4b As shown;

[0099] The gear set 3.2.3 of the present invention is fixed on the guide rail inner frame 3.2.2, and the guide rail 3.2.4 passes through the center of the gear set 3.2.3 and cooperates with its self-lubricating sleeve; the guide rail 3.2.4 is fixed on the guide rail bracket 3.2.5, and the guide rail bracket 3.2.5 is riveted to the guide rail outer frame 3.2.1 by rivets 3.2.6 to form a guide rail assembly 3.2; the guide rail 3.2.4 and the guide rail inner frame 3.2.2 can move on the guide rail by rotating the 3.2.3 gear set 3.2.3, and the specific structure is as follows Figures 4 - 4b As shown;

[0100] The motor assembly 3.4 of the present invention includes a motor 3.4.1, a wire harness and connectors 3.4.2, an output shaft 3.4.3, a motor fixing plate 3.4.4, and a rivet nut 3.4.5; among them, the motor 3.4.1, the wire harness and connectors 3.4.2, and the output shaft 3.4.3 are combined into a small motor assembly and are installed and fixed on the motor fixing plate 3.4.4; the output shaft 3.4.3 is inserted into the gear set 3.2.3 to drive the gear set 3.2.3 to work; the specific structure is as Figures 5 - 5a shown;

[0101] The battery 3.8 of the present invention includes a battery body 3.8.1, a ball head screw 3.8.2, and a rivet nut 3.8.3; the rivet nut 3.8.3 is fixed on the battery body 3.8.1, and the ball head screw 3.8.2 is then screwed onto the rivet nut 3.8.3; the specific structure is as Figures 6 - 6a shown;

[0102] The assembly sequence of the mechanical hardware structure of the bottom guard plate system of the present invention:

[0103] The first guard plate body 3.1.1 is fixed on the motor fixing plate 3.4.4 by bolts, and forms a small assembly with the motor assembly 3.4 and is fixed in the guide rail inner frame 3.2.2. It forms a large assembly with the left guide rail assembly 3.2 and the right guide rail assembly 3.3 and is fixed on the left body bracket 3.5 and the right body bracket 3.7 welded to the lower vehicle body 3.6.

[0104] The mechanical mechanism principle of the bottom guard plate system of the present invention:

[0105] When the controller 3.9 receives the battery swapping signal transmitted by the vehicle BCM, it identifies and outputs a signal to the motor 3.4.1, and the motor 3.4.1 starts to work and provides torque to the output shaft 3.4.3. Since the output shaft 3.4.3 drives the gear set 3.2.3 to rotate, the guide rail 3.2.4 and the guide rail inner frame 3.2.2 can move on the guide rail through the rotation of the gear set 3.2.3; the first guard plate body 3.1.1 moves forward a certain distance on the guide rail along with the motor 3.4.4 to reach the designed state, leaving the space requirement for the battery swapping tooling. Conversely, when the controller 3.9 receives the battery swapping completion signal transmitted by the BCM, it drives the gear set through the motor and completes the movement of the first guard plate body 3.1.1 in the vehicle rear direction until the rubber bushing 3.1.2 embedded in the first guard plate body 3.1.1 is completely inserted into the ball head screw 3.8.2.

[0106] The software control principle of the bottom guard plate system of the present invention:

[0107] When the BCM receives signals such as the vehicle's battery swapping switch signal, vehicle speed, vehicle locking state, power supply, and energy management, after comprehensive processing, it outputs to the controller 3.9. The controller makes the motor 3.4.1 rotate through PWM speed regulation, and then drives through the output shaft 3.4.3 and related mechanisms until the mechanism moves to the position of the in-place switch arranged in the guide rail assembly. At this time, the process of the vehicle bottom guard plate system from closed to open is completed. Conversely, for the process from open to closed, the control logic is the same;

[0108] Synchronously, there are also multiple protection modules set inside the software. ① is voltage protection, ② is stall protection, ③ is thermal protection, ④ is Hall error protection, ⑤ is hardware error protection, ⑥ is position protection, and ⑦ is anti-pinch protection.

[0109] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other.

[0110] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bottom guard plate for an electric vehicle, characterized in that, it includes: a bottom guard plate for the battery; the bottom guard plate for the battery can move relative to the battery, and the bottom guard plate for the battery moves longitudinally along the vehicle body; the bottom guard plate for the battery includes: a front bottom guard plate for the battery and a rear bottom guard plate for the battery; the front bottom guard plate for the battery and / or the rear bottom guard plate for the battery includes: a bottom guard plate body for the battery and a guide rail assembly; the bottom guard plate body for the battery is fixed to the guide rail assembly through the guide rail, and the bottom guard plate body for the battery moves along the direction of the guide rail through the motor assembly.

2. The bottom guard plate for an electric vehicle according to claim 1, characterized in that, the guide rail assembly includes: a left guide rail assembly and a right guide rail assembly; the left guide rail assembly is fixed to the left vehicle body bracket, and the right guide rail assembly is fixed to the right vehicle body bracket; the guide rail includes: a left guide rail and a right guide rail; the left guide rail and the right guide rail are respectively matched with both sides of the bottom guard plate body for the battery.

3. The bottom guard plate for an electric vehicle according to claim 1, characterized in that, the bottom guard plate body for the battery includes: a first guard plate body; the motor assembly includes: a motor fixing plate; the first guard plate body is fixed to the motor fixing plate through bolts, and forms a small assembly with the motor assembly and is fixed to the guide rail assembly together.

4. The bottom guard plate for an electric vehicle according to claim 3, characterized in that, the motor assembly further includes: a motor and an output shaft; the motor and the output shaft are both arranged on the motor fixing plate, and the motor drives the gear set of the guide rail assembly to rotate through the output shaft.

5. The bottom guard plate for an electric vehicle according to claim 1, characterized in that, the front bottom guard plate for the battery and the rear bottom guard plate for the battery are symmetrical about the front and rear of the battery.

6. The bottom guard plate for an electric vehicle according to claim 3, characterized in that, the first guard plate body is provided with a limit bushing, and the limit bushing is used to cooperate with the limit part of the battery body.

7. The bottom guard plate for an electric vehicle according to claim 6, characterized in that, the number of the limit bushings is 2, and the 2 limit bushings are symmetrically distributed longitudinally about the first guard plate body.

8. The bottom guard plate for an electric vehicle according to claim 6, characterized in that, the limit bushing is a rubber bushing.

9. For the bottom guard plate of the electric vehicle according to claim 6, the limit part is a ball head screw, and the ball head screw is arranged on the side edge of the battery body.

10. A method for replacing the battery of an electric vehicle, characterized in that, using the bottom guard plate of the electric vehicle as described in claims 1-9, including the steps: S1. The bottom guard plate for the battery moves relative to the battery to leave a space for the replacement tooling; S2. In the space for the replacement tooling, the battery is replaced; S3. After the battery replacement is completed, the bottom guard plate for the battery moves relative to the battery to close the space for the replacement tooling.

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