A lithium battery assembly for converting a commercial vehicle from fuel to electricity

Abstract

The present invention relates to the technical field of lithium batteries, and specifically to a lithium battery assembly for converting commercial vehicles from fuel to electricity. It includes a vehicle frame, on which a supporting shell for supporting the battery is fixedly installed. An inclined baffle is arranged on the front side of the supporting shell, and the upper and lower sides of the baffle are respectively fixedly installed on the vehicle frame and the supporting shell. A plurality of pairs of partition plates are arranged inside the supporting shell. For the lithium battery assembly for converting commercial vehicles from fuel to electricity provided by this invention, the baffle, the vehicle frame and the supporting shell form a triangular structure, which has a stronger ability to resist impact. Moreover, the supporting block supports the baffle. When the baffle is impacted, the force received by the baffle will be transmitted to the vehicle frame and the bottom plate of the supporting shell, avoiding the battery in the supporting shell from being directly impacted. And when the impact on the baffle is too large, it can also deform and collapse to buffer the supporting shell and the battery therein, and even lift the vehicle frame to protect the battery in the supporting shell by causing the vehicle to bottom out.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and more specifically to a lithium battery assembly for converting fuel vehicles to electric vehicles for commercial vehicles. Background Art

[0002] Converting fuel vehicles to electric vehicles is a model that converts vehicles with original fuel engines into electric vehicles. It mainly uses the frame of fuel vehicles to install high-speed motors and batteries, and builds electric vehicles with the frame of fuel vehicles.

[0003] According to the published (announced) number CN116278685A, the published (announced) date is June 23, 2023. A vehicle system for converting a fuel vehicle to an electric vehicle is disclosed, including a fuel vehicle. The fuel vehicle body replaces the internal combustion engine with an electric drive component, replaces the ECU unit of the fuel vehicle with an electronic control unit, and replaces the fuel tank unit of the fuel vehicle with a battery unit. The fuel vehicle removes the transmission unit. This system directly replaces the three major components of the electric vehicle, namely the battery, the electronic control unit, and the motor, with the fuel tank, the engine control ECU unit, and the three major mechanical components of the engine of the fuel vehicle. It does not require a large amount of cost for researching and developing a pure electric platform, and reuses the technology and structure of the mechanical platform of the fuel vehicle, which can make up for the research and development time and market gap in a short time, and provide strong support for the transition of new energy vehicles.

[0004] In the prior art including the above patent, since there is no reserved position for the lithium battery assembly in the frame of the fuel vehicle, when building an electric vehicle using the frame of the fuel vehicle, the lithium battery assembly of the electric vehicle can only be placed dispersedly. Among them, the lithium battery installed on the vehicle chassis can only extend downward in order not to occupy too much space in the passenger compartment, resulting in a protrusion on the chassis of the vehicle converted from fuel to electric. This part is the position of the lithium battery, resulting in poor vehicle passability. At the same time, the lithium battery assembly is more likely to be scratched. Moreover, the ordinary fuel vehicle frame is not designed with targeted protection for the battery. When the vehicle is laterally impacted, the frame part collapses to protect the passenger compartment, and the lithium battery assembly lacks protection and is squeezed or even punctured, resulting in the battery assembly catching fire, which is not conducive to the safety of the occupants. Summary of the Invention

[0005] The purpose of the present invention is to provide a lithium battery assembly for converting fuel vehicles to electric vehicles for commercial vehicles, aiming to solve the above problems.

[0006] To achieve the above object, the present invention provides a lithium battery assembly for converting a commercial vehicle from fuel to electricity, including a vehicle frame, on which a supporting shell for supporting the battery is fixedly installed. An inclined baffle is arranged on the front side of the supporting shell, and the upper and lower sides of the baffle are respectively fixedly installed on the vehicle frame and the supporting shell. A plurality of pairs of partition plates are arranged inside the supporting shell, and the plurality of pairs of partition plates divide the supporting shell to form a plurality of chambers for accommodating battery packs. Support disks are arranged at both ends of any battery in the battery pack. A crushing area facing the battery pack is arranged on the partition plate, and any pair of partition plates and the supporting shell are combined to form a flow channel parallel to the vehicle moving direction.

[0007] Preferably, a guard plate is arranged between the upper and lower support disks of the battery close to the outer side of the supporting shell in the battery pack.

[0008] Preferably, the battery pack includes a plurality of first batteries, second batteries and third batteries with support disks installed at both ends. The battery pack includes the following two states:

[0009] The first state, a plurality of first batteries, a plurality of second batteries and a plurality of third batteries are arranged vertically and horizontally aligned;

[0010] The second state, a plurality of first batteries, a plurality of second batteries and a plurality of third batteries are arranged in a tower shape.

[0011] Preferably, a guiding plate is arranged inside the supporting shell, and first guide grooves, second guide grooves and third guide grooves adapted to the first batteries, second batteries and third batteries in the second state of the battery pack are arranged on the guiding plate.

[0012] Preferably, first inclined grooves and second inclined grooves for guiding the movement of the second battery and the third battery are arranged on the guiding plate.

[0013] Preferably, a buffer block extending into the guiding plate is arranged on the support disk.

[0014] Preferably, the guiding plate is specifically formed by splicing a plurality of abutting strip plates.

[0015] Preferably, a heat insulation plate is arranged between adjacent two battery packs, a paper sheet is arranged on the heat insulation plate, and the paper sheet retracts into the heat insulation plate when the state of the battery pack is switched.

[0016] Preferably, the heat insulation plate includes a fixed plate and a movable plate distributed in parallel. The movable plate is slidably installed on the support disk of the third battery, and the paper sheet is fixedly installed on the fixed plate and extends outside the movable plate.

[0017] Preferably, sliding plates for blocking the notches thereon are symmetrically slidably arranged on the movable plate.

[0018] In the above technical solution, a lithium battery assembly for converting a commercial vehicle from fuel to electricity provided by the present invention has the following beneficial effects: The baffle, the vehicle frame and the supporting shell form a triangular structure, which has stronger impact resistance. And the supporting block supports the baffle. When the baffle is impacted, the force received by the baffle will be transmitted to the vehicle frame and the bottom plate of the supporting shell, avoiding direct impact on the battery in the supporting shell. And when the impact on the baffle is too large, the baffle can deform and collapse to buffer the supporting shell and the battery in it. Even the vehicle frame can be lifted to protect the battery in the supporting shell by causing the vehicle to bottom out; When the vehicle is driving normally, some air at the bottom of the vehicle will also enter the flow channel. The heat generated by the battery during operation can be transferred to the flow channel through the partition and carried away by the air in the flow channel, avoiding excessive battery temperature; When the vehicle is severely impacted laterally, the vehicle frame will slightly collapse to buffer the impact and protect the occupants inside the vehicle. At this time, the vehicle frame will push against the side wall of the supporting shell to squeeze the supporting disc on the battery, and the supporting discs on the battery pack will squeeze each other to transmit the force to the crush zone on the partition. The crush zone is torn by the extrusion of the battery pack and the supporting disc, and the battery pack can break through the partition and enter the flow channel, protecting the battery while buffering the impact received by the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure provided by the embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure provided by the embodiment of the present invention;

[0022] Figure 3 It is Figure 2 The enlarged view at A in

[0023] Figure 4 It is Figure 2 The enlarged view at B in

[0024] Figure 5 It is a schematic diagram of the structure of the battery pack in the first state provided by the embodiment of the present invention;

[0025] [[ID=�3]] Figure 6 It is Figure 5 The enlarged view at C in

[0026] Figure 7 It is a schematic diagram of the structure of the battery pack in the second state provided by the embodiment of the present invention;

[0027] Figure 8 For Figure 7 the enlarged view at position D in

[0028] Figure 9 This is the structural schematic diagram of the heat insulation plate provided by the embodiment of the present invention;

[0029] Figure 10 This is the structural schematic diagram of the support plate provided by the embodiment of the present invention.

[0030] Explanation of reference numerals:

[0031] 1, vehicle frame; 11, supporting shell; 111, partition board; 112, crushing area; 113, flow channel; 114, baffle; 115, support block; 116, support plate; 117, fixing plate; 12, battery pack; 121, first battery; 122, second battery; 123, third battery; 124, first guide block; 125, second guide block; 126, third guide block; 127, support disc; 128, protection plate; 129, buffer block; 13, heat insulation plate; 131, movable plate; 132, sliding plate; 133, paper sheet; 134, first guide groove; 135, second guide groove; 136, third guide groove; 137, first inclined groove; 138, second inclined groove; 139, guiding plate. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below in conjunction with the accompanying drawings.

[0033] As Figure 1-10 shown, a lithium battery assembly for converting a commercial vehicle from fuel to electricity includes a vehicle frame 1, on which a supporting shell 11 for supporting the battery is fixedly installed. An inclined baffle 114 is arranged on the front side of the supporting shell 11, and the upper and lower sides of the baffle 114 are respectively fixedly installed on the vehicle frame 1 and the supporting shell 11. A plurality of pairs of partition boards 111 are arranged inside the supporting shell 11. The plurality of pairs of partition boards 111 divide the supporting shell 11 to form a plurality of chambers for accommodating the battery pack 12. Support discs 127 are arranged at both ends of any battery in the battery pack 12. Crushing areas 112 facing the battery pack 12 are arranged on the partition boards 111. Any pair of partition boards 111 and the supporting shell 11 are combined to form a flow channel 113 parallel to the vehicle moving direction.

[0034] Specifically, a support block 115 for supporting the baffle 114 is arranged on the vehicle frame 1.

[0035] In the above technical solution, the baffle 114, the vehicle frame 1, and the supporting shell 11 form a triangular structure, which has a stronger ability to resist impact. Moreover, the support block 115 supports the baffle 114. When the baffle 114 is impacted, the force received by the baffle 114 will be transmitted to the vehicle frame 1 and the bottom plate of the supporting shell 11, avoiding direct impact on the battery in the supporting shell 11. And when the impact on the baffle 114 is too large, it can deform and collapse to buffer the supporting shell 11 and the battery therein, and even lift the vehicle frame 1 to protect the battery in the supporting shell 11 by causing the vehicle to bottom out; when the vehicle is driving normally, some air at the bottom of the vehicle will also enter the flow channel 113. The heat generated by the battery during operation can be transferred to the flow channel 113 through the partition plate 111 and taken away by the air in the flow channel 113 to avoid the battery temperature being too high; when the vehicle is subjected to a severe side impact, the vehicle frame 1 will slightly collapse to buffer the impact and protect the occupants inside the vehicle. At this time, the vehicle frame 1 will push against the side wall of the supporting shell 11 to squeeze the supporting plate 127 on the battery. The supporting plates 127 on the battery pack 12 will squeeze each other to transmit the force to the crush zone 112 on the partition plate 111. The crush zone 112 will be torn under the extrusion of the battery pack 12 and the supporting plate 127, and the battery pack 12 can break through the partition plate 111 and enter the flow channel 113 to protect the battery while buffering the impact received by the vehicle.

[0036] As a further embodiment provided by the present invention, a protective plate 128 is provided between the upper and lower supporting plates 127 on the battery of the battery pack 12 close to the outside of the supporting shell 11.

[0037] Specifically, during the process of the side wall of the supporting shell 11 moving towards the inside of the supporting shell 11, it will first contact the protective plate 128 on the supporting plate 127. The protective plate 128 protects the adjacent battery and avoids the battery being punctured by the tearing phenomenon that occurs during the collapse of the side wall of the supporting shell 11. Moreover, the protective plate 128 can push the two supporting plates 127 on the battery to move synchronously, and then push the entire battery pack 12 to move, avoiding the battery from tilting due to uneven forces on its upper and lower supporting plates 127.

[0038] As yet another further embodiment provided by the present invention, the battery pack 12 includes a plurality of first batteries 121, second batteries 122, and third batteries 123 with supporting plates 127 installed at both ends. The battery pack 12 includes the following two states:

[0039] The first state is that a plurality of first batteries 121, a plurality of second batteries 122, and a plurality of third batteries 123 are arranged in a vertical and horizontal alignment.

[0040] The second state is that a plurality of first batteries 121, a plurality of second batteries 122, and a plurality of third batteries 123 are arranged in a tower shape.

[0041] Specifically, when the vehicle is operating normally, the battery pack 12 on the vehicle is in the first state, and there is a certain gap between multiple batteries to avoid heat accumulation caused by battery extrusion. When a collision occurs, the battery pack 12 switches to the second state, and the support plates 127 on multiple batteries abut against each other (as Figure 7 shown), which can improve the ability of the battery pack 12 to resist side collisions, and thus better protect the batteries.

[0042] Furthermore, in the above embodiment, bumps and grooves can be provided on the support plate 127. When the battery pack 12 switches to the second state, adjacent support plates 127 are connected together through the bumps and grooves, further improving the ability of the battery pack 12 to resist collisions, and thus better protecting the batteries.

[0043] As another embodiment further provided by the present invention, a guiding plate 139 is arranged inside the supporting shell 11, and first guiding grooves 134, second guiding grooves 135 and third guiding grooves 136 adapted to the first battery 121, the second battery 122 and the third battery 123 in the second state of the battery pack 12 are arranged on the guiding plate 139.

[0044] Specifically, a first guiding block 124 adapted to the shown first guiding groove 134 is arranged on the support plate 127 of the first battery 121, a second guiding block 125 adapted to the shown second guiding groove 135 is arranged on the support plate 127 of the second battery 122, a third guiding block 126 adapted to the shown third guiding groove 136 is arranged on the support plate 127 of the third battery 123. The first guiding groove 134, the second guiding groove 135 and the third guiding groove 136 penetrate through multiple chambers separated by the partition plate 111, and the crush zone 112 on the partition plate 111 seals the connection between the guiding groove and the flow channel 113.

[0045] Furthermore, when the battery pack 12 switches to the second state, the second guiding block 125 is embedded in the second guiding groove 135, the third guiding block 126 is embedded in the third guiding groove 136, the side wall of the supporting shell 11 pushes the protection plate 128, and multiple protection plates 128 drive multiple support plates 127 to move, thereby pushing the first guiding block 124 on the first battery 121 to move along the first guiding groove 134, the second guiding block 125 on the second battery 122 to move along the second guiding groove 135, and the third guiding block 126 on the third battery 123 to move along the third guiding groove 136, so that the battery pack 12 squeezes the crush zone 112 until the crush zone 112 ruptures, and the battery pack 12 enters the flow channel 113 to buffer the collision received by the vehicle.

[0046] As another embodiment further provided by the present invention, a first inclined groove 137 and a second inclined groove 138 for guiding the movement of the second battery 122 and the third battery 123 are arranged on the guiding plate 139.

[0047] Specifically, the second end of the first inclined groove 137 communicates with the second guide groove 135. A ramp adapted to the first inclined groove 137 is provided on the second guide block 125. The second end of the second inclined groove 138 communicates with the third guide groove 136. A ramp adapted to the second inclined groove 138 is provided on the third guide block 126.

[0048] Further, when the battery pack 12 is in the first state, the second guide block 125 on the second battery 122 is located at the first end of the first inclined groove 137, and the third guide block 126 on the third battery 123 is located at the first end of the second inclined groove 138. When the battery pack 12 is switched from the first state to the second state, the second guide block 125 on the second battery 122 enters the second guide groove 135 along the first inclined groove 137, and the third guide block 126 on the third battery 123 enters the third guide groove 136 along the second inclined groove 138, so that the battery pack 12 moves as a whole.

[0049] As another embodiment further provided by the present invention, a buffer block 129 extending into the guide plate 139 is provided on the support plate 127.

[0050] Specifically, during normal operation, the buffer block 129 fixes the support plate 127 in the support shell 11, thereby fixing the battery and preventing the battery from vibrating during the operation of the vehicle. When the vehicle is subjected to a severe lateral impact, the vehicle frame 1 will slightly collapse to buffer the impact and protect the occupants inside the vehicle. At this time, the vehicle frame 1 will push against the side wall of the support shell 11 to squeeze the support plate 127 on the battery. The buffer block 129 on the support plate 127 buffers the impact by breaking. Then the battery pack 12 is switched from the second state to the second state, and the battery pack 12 moves as a whole to further buffer the impact received by the vehicle.

[0051] As another embodiment further provided by the present invention, the guide plate 139 is specifically formed by splicing a plurality of abutting strip-shaped plates.

[0052] Specifically, when the battery moves, the guide plate 139 lacks support and deforms. The guide plate 139 formed by splicing a plurality of strip-shaped plates will deform one by one, and the shape of the guide groove on the entire guide plate 139 will not be affected by the impact on the outermost part, which is convenient for the battery pack 12 to move along the guide groove on the guide plate 139.

[0053] As another embodiment further provided by the present invention, a heat insulation plate 13 is provided between adjacent two battery packs 12. A paper sheet 133 is provided on the heat insulation plate 13. The state of the battery pack 12 is switched to cause the paper sheet 133 to retract into the heat insulation plate 13.

[0054] Specifically, when the battery pack 12 is in the first state and operating normally, the paper sheet 133 on the heat insulation plate can block the heat transfer between two adjacent battery packs 12, protecting the normal operation of multiple battery packs 12; when the vehicle is impacted and the battery pack 12 switches from the first state to the second state, the paper sheet 133 retracts into the interior of the heat insulation plate 13, preventing the fire caused by partial battery puncture from spreading to other battery packs 12 through the paper sheet 133.

[0055] As another embodiment further provided by the present invention, the heat insulation plate 13 includes a fixed plate 117 and a movable plate 131 that are distributed in parallel. The movable plate 131 is slidably mounted on the support plate 127 of the third battery 123, and the paper sheet 133 is fixedly mounted on the fixed plate 117 and extends to the outside of the movable plate 131.

[0056] Specifically, the movable plate 131 is provided with a notch for the paper sheet 133 to extend out, and the paper sheet 133 is also provided on the side wall of the fixed piece away from the movable plate 131.

[0057] Further, when the battery pack 12 switches from the first state to the second state, the support plate 127 on the third battery 123 drives the movable plate 131 to move away from the fixed plate 117, the distance between the fixed plate 117 and the movable plate 131 increases, and the paper sheet 133 extending to the outside of the movable plate 131 on the fixed plate 117 is pulled back and retracted between the movable plate 131 and the fixed plate 117, preventing the fire caused by partial battery puncture from spreading to other battery packs 12 through the paper sheet 133.

[0058] As another embodiment further provided by the present invention, sliding plates 132 for blocking the notches thereon are symmetrically slidably arranged on the movable plate 131.

[0059] Specifically, a spring is provided between the sliding plate 132 and the movable plate 131. The partition plates 111 are specifically two pairs. The two pairs of partition plates 111 divide the support shell 11 into three chambers for storing battery packs 12 and two flow channels 113 for air flow to pass through. A rigid support plate 116 is provided in the middle of the middle chamber, and the support plate 116 divides the battery pack 12 into left and right parts, preventing the left and right parts from affecting each other.

[0060] Furthermore, the baffle 114, the vehicle frame 1, and the support shell 11 form a triangular structure, which has a stronger ability to resist impact. The support block 115 supports the baffle 114. When the baffle 114 is impacted, the force received by the baffle 114 will be transmitted to the vehicle frame 1 and the bottom plate of the support shell 11, preventing the battery in the support shell 11 from being directly impacted. Moreover, when the impact on the baffle 114 is too large, it can deform and collapse to buffer the support shell 11 and the battery therein, and even lift the vehicle frame 1 to protect the battery in the support shell 11 by causing the vehicle to bottom out. When the vehicle is running normally, the buffer block 129 fixes the support plate 127 in the support shell 11, thereby fixing the battery and preventing the battery from vibrating during the operation of the vehicle. Part of the air at the bottom of the vehicle will also enter the flow channel 113. The heat generated by the battery during operation can be transferred to the flow channel 113 through the partition plate 111 and carried away by the air in the flow channel 113 to prevent the battery from overheating. The paper sheet 133 on the heat insulation plate can block the heat transfer between adjacent battery packs 12 and protect the normal operation of multiple battery packs 12.

[0061] When the vehicle is subjected to a severe side impact, the vehicle frame 1 will slightly collapse to buffer the impact and protect the occupants inside the vehicle. At this time, the vehicle frame 1 will push against the side wall of the support shell 11 to collapse. The side wall of the support shell 11 contacts the guard plate 128 on the support plate 127. The guard plate 128 protects the adjacent battery and prevents the side wall of the support shell 11 from being torn during the collapse process from piercing the battery. Moreover, the guard plate 128 can push the two support plates 127 on the battery to move synchronously. The buffer block 129 on the support plate 127 buffers the impact by breaking. The support plate 127 drives the battery to move. The second guide block 125 on the second battery 122 enters the second guide groove 135 along the first inclined groove 137, and the third guide block 126 on the third battery 123 enters the third guide groove 136 along the second inclined groove 138. The battery pack 12 switches from the first state to the second state. The movable plate 131 moves away from the fixed plate 117 along with the support plate 127 on the third battery 123. The distance between the fixed plate 117 and the movable plate 131 increases. The paper sheet 133 extending outside the movable plate 131 on the fixed plate 117 is pulled back between the movable plate 131 and the fixed plate 117. The sliding plate 132 moves under the action of the spring to seal the notch on the movable plate 131, preventing part of the battery from piercing and catching fire from spreading to other battery packs 12 through the paper sheet 133. The side wall of the support shell 11 continues to collapse and pushes the battery pack 12 to continue moving along the guide groove. The support plates 127 on the battery pack 12 squeeze each other to transmit the force to the crush zone 112 on the partition plate 111. The crush zone 112 is torn under the extrusion of the battery pack 12 and the support plate 127. The battery pack 12 can break through the partition plate 111 and enter the flow channel 113, protecting the battery while buffering the impact received by the vehicle.

[0062] When the lateral impact on the vehicle is too large, the battery pack 12 that moves into the channel can continue to break through the crush zone 112 on the partition 111, and then push the battery pack 12 in the middle chamber to switch from the first state to the second state, thereby further buffering the impact on the vehicle and protecting the occupants inside the occupant compartment.

[0063] Furthermore, the materials of the crush zone and the buffer block in the above embodiments are both easily breakable tin alloy or aluminum alloy.

[0064] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lithium battery assembly for converting a commercial vehicle from fuel to electricity, including a vehicle frame, characterized in that, A support shell for supporting a battery is fixedly installed on the vehicle frame. An inclined baffle is arranged on the front side of the support shell. The upper and lower sides of the baffle are respectively fixedly installed on the vehicle frame and the support shell. A plurality of pairs of partition plates are arranged inside the support shell. The plurality of pairs of partition plates divide the support shell to form a plurality of chambers for accommodating battery packs. Support disks are arranged at both ends of any battery in the battery pack. A crush zone facing the battery pack is arranged on the partition plate. Any pair of partition plates and the support shell are combined to form a flow channel parallel to the moving direction of the vehicle; A guard plate is arranged between the upper and lower support disks of the battery on the outer side of the support shell close to the battery pack; The battery pack includes a plurality of first batteries, second batteries and third batteries with support disks installed at both ends. The battery pack includes the following two states: The first state, a plurality of first batteries, a plurality of second batteries and a plurality of third batteries are arranged in a vertical and horizontal alignment; The second state, a plurality of first batteries, a plurality of second batteries and a plurality of third batteries are arranged in a tower shape; A guiding plate is arranged inside the support shell. First guide grooves, second guide grooves and third guide grooves adapted to the first battery, second battery and third battery in the second state of the battery pack are arranged on the guiding plate; First inclined grooves and second inclined grooves for guiding the movement of the second battery and the third battery are arranged on the guiding plate; 2. The lithium battery assembly for converting a commercial vehicle from fuel to electricity according to claim 1, wherein Buffer blocks extending into the guiding plate are arranged on the support disk; 3. A lithium battery assembly for converting a commercial vehicle from fuel to electricity according to claim 1, characterized in that, The guiding plate is specifically formed by splicing a plurality of abutting strip plates; 4. A lithium battery assembly for converting a commercial vehicle from fuel to electricity according to claim 1, characterized in that, A heat insulation plate is arranged between adjacent two battery packs. A piece of paper is arranged on the heat insulation plate. When the state of the battery pack is switched, the piece of paper retracts into the heat insulation plate; 5. A lithium battery assembly for converting a commercial vehicle from fuel to electricity according to claim 4, characterized in that, The heat insulation plate includes a fixed plate and a movable plate which are distributed in parallel. The movable plate is slidably installed on the support disk of the third battery. The piece of paper is fixedly installed on the fixed plate and extends to the outside of the movable plate; 6. The lithium battery assembly for converting a commercial vehicle from fuel to electricity according to claim 5, characterized in that, Sliding plates for blocking the notch on it are symmetrically and slidably arranged on the movable plate;

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