An electric vehicle lithium battery that is easy to install and replace

Abstract

The utility model discloses a lithium battery for electric vehicles that is easy to install and replace, including a shell, a battery module, an inner tank frame, a shell cover and a limit plate. The inner tank frame is installed in the shell, the battery module is embedded in the inner tank frame, the limit plate is installed on the top of the inner tank frame, the shell cover is detachably connected to the shell, the battery module includes a lithium battery, a BMS module, a lithium battery fixing frame and an isolation plate, the number of lithium batteries is multiple, each lithium battery is installed in the lithium battery fixing frame, adjacent lithium battery fixing frames are plug-in connected, multiple lithium batteries form a lithium battery pack, the BMS module is arranged on the limit plate and is electrically connected to the lithium battery pack, and multiple isolation plates are distributed around the lithium battery pack. The shell and the shell cover of the utility model are detachably connected, the limit plate and the shell are detachably connected, the shell is provided with an inner tank frame for accommodating the lithium battery pack, the inner tank frame is located on the lower side of the limit plate and has an opening on the top, so as to realize the rapid installation and disassembly of the lithium battery pack and improve the convenience of lithium battery pack maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a lithium battery for electric vehicles which is easy to install and replace. Background Art

[0002] As the concept of environmental protection has become more popular, electric vehicles have gradually become one of the important means of transportation for people. As an important energy source for electric vehicles, the convenience and safety of lithium batteries have an important impact on the development of electric vehicles. Most of the existing electric vehicle lithium batteries are fixed inside the electric vehicle. Replacing the battery requires professional personnel, and the operation process is dangerous and complicated, which brings many inconveniences to users. Therefore, designing an electric vehicle lithium battery that is easy to replace is a key issue that needs to be solved at present. Utility Model Content

[0003] The purpose of the present utility model is to overcome the deficiencies in the above-mentioned prior art and to provide an electric vehicle lithium battery that is easy to install and replace. The shell and shell cover of the utility model are detachably connected, the limiting plate and the shell are detachably connected, and an inner liner frame for accommodating the lithium battery pack is arranged in the shell. The inner liner frame is located at the lower side of the limiting plate and has an open top, so as to realize the rapid installation and disassembly of the lithium battery pack, improve the convenience of lithium battery pack maintenance, and solve the problem of dangerous and complicated battery replacement.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a lithium battery for an electric vehicle that is easy to install and replace, comprising a shell, a battery module, an inner tank frame, a shell cover and a limit plate, the inner tank frame is installed in the shell, the battery module is embedded in the inner tank frame, the limit plate is installed on the top of the inner tank frame, the shell cover is detachably connected to the shell, the battery module comprises a lithium battery, a BMS module, a lithium battery fixing frame and an isolation plate, the number of the lithium batteries is multiple, each of the lithium batteries is installed in the mounting hole of the lithium battery fixing frame, two adjacent lithium battery fixing frames are pluggable and connected, and the multiple lithium batteries are connected through the lithium battery fixing frame to form a lithium battery pack, the lithium battery pack is a square structure, the BMS module is arranged on the upper side of the limit plate and is electrically connected to the lithium battery pack, the number of the isolation plates is multiple, and the multiple isolation plates are distributed around the lithium battery pack.

[0005] Preferably, the shell cover includes a shell cover body, a charging and discharging socket and a handle, the shell cover body is a square structure with an open bottom, the charging and discharging socket is arranged on the top of the shell cover body, the charging and discharging socket is electrically connected to the BMS module, and the handle is installed in the middle of the shell cover body.

[0006] Preferably, the inner liner frame includes an inner liner body and a support frame, the inner liner body is a hollow square structure with an opening at the top, the size of the inner liner body matches the size of the lithium battery pack, the support frame is arranged on the outside of the inner liner body, and a distance is left between the outer wall of the inner liner body and the inner wall of the shell, and the end of the support frame away from the inner liner body is connected to the shell.

[0007] Preferably, the support frame includes a first support portion and a second support portion, the first support portion is arranged around the bottom of the inner liner body, the end of the first support portion away from the inner liner body is connected to the bottom surface of the shell, the second support portion is arranged along the height direction of the inner liner body, and the second support portion is provided at the connection between the two side surfaces of the inner liner body, the length of the second support portion is consistent with the height of the inner liner body, and the end of the second support portion away from the inner liner body is connected to the corresponding inner side wall end of the shell.

[0008] Preferably, ventilation holes are arranged on the four side walls of the inner liner body, a limiting plate is installed on the top of the inner liner body, four ends of the limiting plate are respectively pressed against the inner side walls of the shell, and the limiting plate is detachably connected to the shell.

[0009] Preferably, the handle includes a pull ring and a fixing part, the interior of the pull ring is a hollow structure, the pull ring is rotatably connected to the fixing part, the fixing part includes a connecting plate and a accommodating chamber, the number of the connecting plates is two, the ends of the two connecting plates are respectively fixedly connected to the left and right sides of the accommodating chamber, and after the pull ring is located in the accommodating chamber, the connecting plate is fastened to the shell cover body by bolts.

[0010] Preferably, the pull ring is a square structure or a circular structure.

[0011] Preferably, the isolation board is an epoxy resin fiberglass board.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The shell of the utility model is detachably connected to the shell cover, and the limiting plate is detachably connected to the shell. An inner liner frame for accommodating the lithium battery pack is arranged in the shell. The inner liner frame is located at the lower side of the limiting plate and has an opening at the top, so that the lithium battery pack can be quickly installed and disassembled, the convenience of lithium battery pack maintenance is improved, and the problem of dangerous and complicated battery replacement is solved.

[0014] 2. The inner liner frame of the utility model includes an inner liner body and a support frame. A distance is left between the inner liner body and the inner wall of the shell. The support frame is arranged along the edge of the inner liner body and has an angle with the horizontal direction. Multiple support frames form a trapezoidal structure, which improves the stability of the inner liner frame.

[0015] 3. The inner body of the lithium battery pack of the utility model can be freely taken out. When the lithium battery pack needs to be replaced, it is only necessary to take out the inner body of the lithium battery pack for replacement without scrapping the shell together, which can control the production cost of battery products and improve economic benefits.

[0016] The present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the exterior of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the internal components of the housing of the utility model;

[0020] Figure 4 This is a schematic diagram of the second connection relationship between the shell cover and the shell of the utility model;

[0021] Figure 5 This is a back schematic diagram of the second connection relationship between the shell cover and the shell body of the utility model.

[0022] Description of reference numerals:

[0023] 1—housing; 1-1—second threaded hole; 1-2—third threaded hole 2—battery module; 2-1—lithium battery; 2-2—BMS module;

[0024] 2-3—Lithium battery fixing frame; 2-4—Isolation board;

[0025] 2-5—Lithium battery pack; 3—Inner container frame; 3-1—Inner container body;

[0026] 3-2—support frame; 3-3—first support portion; 3-4—second support portion;

[0027] 3-5—ventilation hole; 4—shell cover; 4-1—shell cover body;

[0028] 4-2—Charging and discharging socket; 4-3—Handle; 4-4—Pull ring;

[0029] 4-5—fixing member; 4-6—connecting plate; 4-7—accommodating chamber;

[0030] 4-8—first threaded hole; 5—limiting plate; 5-1—fourth threaded hole;

[0031] 6—connecting piece; 7—fastening piece; 8—clamping part;

[0032] 9—Gap. DETAILED DESCRIPTION

[0033] like Figure 1 , Figure 2 As shown, the utility model includes a shell 1, a battery module 2, an inner tank frame 3, a shell cover 4 and a limit plate 5, the inner tank frame 3 is installed in the shell 1, the battery module 2 is embedded in the inner tank frame 3, the limit plate 5 is installed on the top of the inner tank frame 3, the shell cover 4 is detachably connected to the shell 1, the battery module 2 includes a lithium battery 2-1, a BMS module 2-2, a lithium battery fixing frame 2-3 and an isolation plate 2-4, the number of lithium batteries 2-1 is multiple, each lithium battery 2-1 is installed in the mounting hole of the lithium battery fixing frame 2-3, two adjacent lithium battery fixing frames 2-3 are pluggable and connected, multiple lithium batteries 2-1 are connected through the lithium battery fixing frame 2-3 to form a lithium battery pack 2-5, the lithium battery pack 2-5 is a square structure, the BMS (Battery Management System) module 2-2 is arranged on the upper side of the limit plate 5 and is electrically connected to the lithium battery pack 2-5, the number of isolation plates 2-4 is multiple, and multiple isolation plates 2-4 are distributed around the lithium battery pack 2-5.

[0034] The shell 1 is a hollow square structure with an open top. The inner liner frame 3 is fixedly arranged in the shell 1 to prevent the inner liner frame 3 from shaking or moving in the shell 1. The lithium battery 2-1 is fixed by the lithium battery fixing frame 2-3. Two adjacent lithium battery fixing frames 2-3 are connected by the plug-in blocks on the side walls and the plug-in holes matching the plug-in blocks, so that the positions of the two adjacent lithium battery fixing frames 2-3 are fixed, that is, the positions of multiple lithium batteries 2-1 are fixed, and then the multiple lithium batteries 2-1 can be neatly arranged through the lithium battery fixing frames 2-3 to form a lithium battery group 2-5. After the isolation plates 2-4 are arranged around the lithium battery group 2-5, the lithium battery group 2-5 is placed in the inner liner. The inner frame 3 is a lithium-ion battery pack 2-5, which is tightly attached to the inner wall of the inner frame 3 to prevent the lithium-ion battery pack 2-5 from shaking or moving in the inner frame 3. The limit plate 5 is then installed on the top of the inner frame 3. The limit plate 5 is tightly attached to the top of the inner frame 3 to fix the inner frame 3. The end of the limit plate 5 is detachably connected to the side wall of the shell 1, which is convenient for installing or replacing the battery. The limit plate 5 can be detached from the shell 1. After the installation of the limit plate 5 is completed, the BMS module 2-2 is threadedly connected to the limit plate 5 to fix the position of the BMS module 2-2. After the BMS module 2-2 is electrically connected to the lithium-ion battery pack 2-5, the shell cover 4 is connected to the shell 1.

[0035] like Figure 1 , Figure 2As shown, the shell cover 4 includes a shell cover body 4-1, a charging and discharging socket 4-2 and a handle 4-3. The shell cover body 4-1 is a square structure with an open bottom. The charging and discharging socket 4-2 is arranged on the top of the shell cover body 4-1. The charging and discharging socket 4-2 is electrically connected to the BMS module 2-2. The handle 4-3 is installed in the middle of the shell cover body 4-1.

[0036] After the shell cover body 4-1 contacts the top of the shell 1, the inner side wall of the shell cover body 4-1 is tightly attached to the outer side wall of the top of the shell 1, and the contact part of the shell cover body 4-1 and the shell 1 is provided with a first threaded hole 4-8 along the four sides of the shell cover body 4-1, and the side wall of the shell cover body 4-1 on the upper side of the first threaded hole 4-8 protrudes inwardly, and the side wall of the shell cover body 4-1 at the first threaded hole 4-8 forms the inner edge of the shell cover body 4-1, and the inner edge of the shell cover body 4-1 is a horizontal inner edge, which is used to limit the downward movement of the shell cover body 4-1 along the shell 1, and the top of the shell 1 is provided with a position corresponding to the first threaded hole 4-8. There is a second threaded hole 1-1, and the side wall of the shell 1 at the lower side of the second threaded hole 1-1 protrudes outward. The side wall of the shell 1 at the second threaded hole 1-1 forms the outer edge of the shell 1. The first threaded hole 4-8 has the same inner diameter as the second threaded hole 1-1. After the discharge socket 4-2 is electrically connected to the BMS module 2-2, the shell cover body 4-1 is connected to the shell 1. The bottom of the shell cover body 4-1 contacts the outer edge of the shell 1. At this time, the first threaded hole 4-8 and the second threaded hole 1-1 are located at the same height, and the shell cover body 4-1 is threadedly connected to the shell 1 through the first threaded hole 4-8 and the second threaded hole 1-1.

[0037] In another possible implementation manner, different from the above-mentioned embodiment, a first through hole is provided along the four sides of the shell cover body 4-1 at the contact portion between the shell cover body 4-1 and the shell 1, and the first through hole replaces the first threaded hole 4-8, and the first through hole and the first threaded hole 4-8 are provided at the same position, and a second through hole is provided at the top of the shell 1 at a position corresponding to the first through hole, and the second through hole replaces the second threaded hole 1-1, and the second through hole and the second threaded hole 1-1 are provided at the same position, and the first through hole and the second through hole have the same inner diameter, and the first through hole and the second through hole can be Insert the clip, which is elastic and can pass through the first through hole and the second through hole after being tightened. After passing through the first through hole and the second through hole, the end of the clip located on the inner side of the shell 1 is pressed against the inner wall of the shell 1 at the second through hole, so that the shell cover body 4-1 is firmly connected to the shell 1. If it is necessary to separate the shell cover body 4-1 from the shell 1, pinch the end of the clip located outside the shell cover body 4-1. At this time, the end of the clip located on the inner side of the shell 1 is released from the press against the inner wall of the shell 1, and the clip can be taken out of the first through hole and the second through hole.

[0038] like Figure 4 , Figure 5As shown, in another possible implementation manner, different from the above-mentioned embodiment, the bottom of the shell cover body 4-1 is tightly attached to the top of the shell body 1, and one side of the shell cover body 4-1 is connected to the side wall corresponding to the shell 1 through a connecting piece 6, so that the shell cover body 4-1 can be opened and closed along the top of the shell 1, and a fastener 7 is provided on the side wall of the shell cover body 4-1 where no connecting piece is provided, and a clamping part 8 matched with the fastener is provided on the side wall of the shell 1 where no connecting piece is provided, and the fastener can be rotated downward along the fastener rotation axis to be fastened with the clamping part, so that the shell cover body 4-1 is tightly connected to the shell 1. If it is necessary to separate the shell cover body 4-1 from the shell 1, the fastener 7 and the clamping part 8 are released to allow the shell cover body 4-1 to be opened along the top of the shell 1.

[0039] like Figure 2 , Figure 3 As shown, the inner liner frame 3 includes an inner liner body 3-1 and a support frame 3-2. The inner liner body 3-1 is a hollow square structure with an open top. The size of the inner liner body 3-1 matches the size of the lithium battery pack 2-5. The support frame 3-2 is arranged on the outside of the inner liner body 3-1. There is a distance between the outer wall of the inner liner body 3-1 and the inner wall of the shell 1. The end of the support frame 3-2 away from the inner liner body 3-1 is connected to the shell 1.

[0040] After the lithium battery pack 2-5 is placed in the inner liner body 3-1, the side walls of the lithium battery pack 2-5 are tightly attached to the inner side walls of the inner liner body 3-1, the bottom of the lithium battery pack 2-1 is in contact with the bottom of the inner liner body 3-1, and the top of the lithium battery pack 2-1 and the top of the inner liner body 3-1 are at the same height, making it convenient for the limiting plate 5 to fix the top of the lithium battery pack 2-1 and the inner liner body 3-1 at the same time.

[0041] In another possible embodiment, the inner liner body 3-1 may be cylindrical, and the lithium battery pack 2-5 matches the shape of the inner liner body 3-1. Here, there is no limitation on the shapes of the inner liner body 3-1 and the lithium battery pack 2-5.

[0042] like Figure 2 , Figure 3 As shown, the support frame 3-2 includes a first support portion 3-3 and a second support portion 3-4. The first support portion 3-3 is arranged around the bottom of the inner liner body 3-1, and the end of the first support portion 3-3 away from the inner liner body 3-1 is connected to the bottom surface of the shell 1. The second support portion 3-4 is arranged along the height direction of the inner liner body 3-1. The second support portion 3-4 is provided at the connection between the two side surfaces of the inner liner body 3-1. The length of the second support portion 3-4 is consistent with the height of the inner liner body 3-1, and the end of the second support portion 3-4 away from the inner liner body 3-1 is connected to the corresponding inner side wall end of the shell 1.

[0043] The first support portion 3-3 is fixedly connected to the bottom end of the liner body 3-1 along the length direction, and the first support portion 3-3 supports the liner body 3-1 upward so that a distance is left between the bottom surface of the liner body 3-1 and the bottom of the shell 1. The first support portion 3-3 has an angle with the horizontal direction so that the first support portion 3-3 supports the liner body 3-1 obliquely upward. The left and right end portions of the bottom surface of the liner body 3-1 are fixedly connected to the first support portion 3-3, and the front and rear end portions of the bottom surface of the liner body 3-1 are fixedly connected to the first support portion 3-3. Each first support portion 3-3 is away from the liner body 3 -1 is fixedly connected to the connection between the bottom surface of the shell 1 and the side wall of the shell 1 at the ends, and multiple first support parts 3-3 form a trapezoidal structure to support the inner liner body 3-1 upward; the second support part 3-4 fixes the side wall of the inner liner body 3-1, and the second support part 3-4 is fixedly connected to the intersection of the two side walls of the inner liner body 3-1 along the length direction, and the end of the second support part 3-4 away from the inner liner body 3-1 is fixedly connected to the intersection of the two inner side walls of the shell 1, and the stability of the support frame 3-2 supporting the inner liner body 3-1 is improved by the first support part 3-3 and the second support part 3-4.

[0044] like Figure 2 , Figure 3 As shown, ventilation holes 3-5 are arranged on the four side walls of the inner liner body 3-1, and the limiting plate 5 is installed on the top of the inner liner body 3-1. The four ends of the limiting plate 5 are respectively pressed against the inner side walls of the shell 1, and the limiting plate 5 is detachably connected to the shell 1.

[0045] The side wall of the inner tank body 3-1 is provided with air holes 3-5, which can improve the heat dissipation performance of the lithium battery pack 2-5 and improve the safety of the lithium battery pack 2-5; the limiting plate 5 is provided with a notch 9 near the inner tank body 3-1, and the BMS module 2-2 controls the charging and discharging of the lithium battery pack 2-5 to protect the battery and extend the service life of the battery; the notch 9 is provided to facilitate the wiring between the lithium battery pack 2-5 and the BMS module 2-2, and the lithium battery pack 2-5 and the BMS module 2-2 are connected by soldering to complete the circuit conduction; at the same time, a foam with a certain thickness is placed on the limiting plate 5 so that the foam is located around the BMS module 2-2. The foam can prevent the surface of the wire harness from being worn and causing a short circuit; the foam can also isolate the wire harness, the BMS module 2-2 and the shell 1 to play an insulating and buffering role.

[0046] BMS module 2-2 uses the lithium battery protection board produced by Shenzhen Jiabaida Technology Co., Ltd.

[0047] The size of the limit plate 5 matches the inner cross-section size of the shell 1. A plurality of third threaded holes 1-2 are arranged on the side wall of the shell 1 in the horizontal direction. After the limit plate 5 is pressed against the inner side wall of the shell 1, the limit plate 5 is threadedly connected to the shell 1 by bolts.

[0048] The limiting plate 5 is a square plate, the size of which matches the size of the inner cross-section of the shell 1. An upward extending portion perpendicular to the limiting plate 5 is provided on the side walls around the limiting plate 5. The length of the upward extending portion is consistent with the length of the limiting plate 5. Each upward extending portion is provided with a plurality of fourth threaded holes 5-1, which are arranged along the length direction of the upward extending portion. The fourth threaded hole 5-1 matches the position of the third threaded hole 1-2. The limiting plate 5 can be threadedly connected to the shell 1 through the fourth threaded hole 5-1 and the third threaded hole 1-2.

[0049] In a possible embodiment, the limiting plate 5 is a U-shaped structure, the lateral end of the limiting plate 5 is tightly attached to the top of the inner tank body 3-1, the vertical end of the limiting plate 5 is tightly attached to the inner wall of the shell 1, and a plurality of third threaded holes 1-2 are arranged on the side wall of the shell 1 in the horizontal direction, and a fourth threaded hole 5-1 is arranged at the vertical end of the limiting plate 5 at a position corresponding to the third threaded hole. After the third threaded hole 1-2 is aligned with the fourth threaded hole 5-1, the limiting plate 5 can be threadedly connected to the shell 1 by bolts.

[0050] In another possible embodiment, different from the above embodiment, a third through hole is provided on the shell 1, and the third threaded hole 1-2 is replaced by the third through hole, and the third through hole and the third threaded hole 1-2 are set at the same position; a fourth through hole is provided on the limiting plate 5, and the fourth through hole replaces the fourth threaded hole 5-1, and the fourth through hole and the fourth threaded hole 5-1 are set at the same position; the shell 1 and the limiting plate 5 are fastened together by a clip, and the clip passes through the third through hole and the fourth through hole and is pressed against the inner wall of the limiting plate 5. If the limiting plate 5 needs to be removed, the end of the clip located on the outside of the shell 1 is pinched, and at this time, the end of the clip located on the inner side of the limiting plate 5 is released from the press against the inner wall of the limiting plate 5, and the clip can be taken out of the third through hole and the fourth through hole.

[0051] like Figure 1 , Figure 2 As shown, the handle 4-3 includes a pull ring 4-4 ​​and a fixing member 4-5. The interior of the pull ring 4-4 ​​is a hollow structure. The pull ring 4-4 ​​is rotatably connected to the fixing member 4-5. The fixing member 4-5 includes a connecting plate 4-6 and a accommodating chamber 4-7. There are two connecting plates 4-6. The ends of the two connecting plates 4-6 are respectively fixedly connected to the left and right sides of the accommodating chamber 4-7. After the pull ring 4-4 ​​is located in the accommodating chamber 4-7, the connecting plate 4-6 is fastened to the shell cover body 4-1 by bolts.

[0052] The pull ring 4-4 ​​makes it easy to take and transport the lithium battery.

[0053] The pull ring 4-4 ​​is a square structure or a circular structure.

[0054] The isolation plates 2-4 are epoxy resin plates.

[0055] The lithium battery pack 2 - 5 is insulated from the outside by laying out an epoxy resin plate around the lithium battery pack 2 - 5 .

[0056] When in use, epoxy resin plates are placed around the lithium battery pack 2-5 to insulate the lithium battery pack 2-5 from the outside, and then the lithium battery pack 2-5 is placed inside the inner liner body 3-1. Since the size of the lithium battery pack 2-5 matches the size of the hollow cavity of the inner liner body 3-1, the lithium battery pack 2-5 will not shake in the inner liner body 3-1. After the lithium battery pack 2-5 is placed, the limiting plate 5 is placed on the top of the inner liner body 3-1, and the lithium battery pack 2-5 and the inner liner body 3-1 are fixed by the limiting plate 5 to avoid vibration and other problems of the lithium battery pack 2-5. The S module 2-2 is fixed to the limit plate 5 by bolts, and the BMS module 2-2 and the lithium battery pack 2-5 are connected by soldering to complete the circuit conduction; at the same time, foam is placed around the BMS module 2-2 to prevent the harness from being worn. Finally, the handle 4-3 and the charge and discharge socket 4-2 are installed on the shell cover body 4-1, and the shell cover body 4-1 is fastened to the shell 1 by bolts to form a battery module 2. The handle 4-3 is convenient for taking and transporting the battery module 2, and the charge and discharge socket 4-2 can realize the charge and discharge operation of the battery module 2 by connecting with the plug. The quick installation and disassembly of the lithium battery pack is realized by the detachable connection between the shell cover body 4-1 and the shell 1, and the detachable connection between the limit plate 5 and the shell 1, which solves the problem of dangerous and complicated battery replacement.

[0057] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An electric vehicle lithium battery that is easy to install and replace, characterized in that: The invention comprises a shell (1), a battery module (2), an inner liner frame (3), a shell cover (4) and a limit plate (5), wherein the inner liner frame (3) is installed in the shell (1), the battery module (2) is embedded in the inner liner frame (3), the limit plate (5) is installed on the top of the inner liner frame (3), the shell cover (4) is detachably connected to the shell (1), the battery module (2) comprises a lithium battery (2-1), a BMS module (2-2), a lithium battery fixing frame (2-3) and an isolation plate (2-4), the number of the lithium batteries (2-1) is multiple, and each of the lithium batteries (2-1) 2-1) are all installed in the installation holes of the lithium battery fixing frame (2-3), two adjacent lithium battery fixing frames (2-3) are pluggable and connected, a plurality of lithium batteries (2-1) are connected through the lithium battery fixing frames (2-3) to form a lithium battery group (2-5), the lithium battery group (2-5) is a square structure, the BMS module (2-2) is arranged on the upper side of the limiting plate (5) and is electrically connected to the lithium battery group (2-5), the number of the isolation plates (2-4) is multiple, and the multiple isolation plates (2-4) are distributed around the lithium battery group (2-5).

2. The lithium battery for electric vehicles that is easy to install and replace according to claim 1, characterized in that: The shell cover (4) comprises a shell cover body (4-1), a charging and discharging socket (4-2) and a handle (4-3); the shell cover body (4-1) is a square structure with an open bottom; the charging and discharging socket (4-2) is arranged on the top of the shell cover body (4-1); the charging and discharging socket (4-2) is electrically connected to the BMS module (2-2); and the handle (4-3) is installed in the middle of the shell cover body (4-1).

3. The lithium battery for electric vehicles that is easy to install and replace according to claim 1, characterized in that: The inner liner frame (3) comprises an inner liner body (3-1) and a support frame (3-2); the inner liner body (3-1) is a hollow square structure with an open top; the size of the inner liner body (3-1) matches the size of the lithium battery pack (2-5); the support frame (3-2) is arranged on the outside of the inner liner body (3-1); a distance is left between the outer wall of the inner liner body (3-1) and the inner wall of the shell (1); and the end of the support frame (3-2) away from the inner liner body (3-1) is connected to the shell (1).

4. The lithium battery for electric vehicles that is easy to install and replace according to claim 3, characterized in that: The support frame (3-2) comprises a first support portion (3-3) and a second support portion (3-4); the first support portion (3-3) is arranged around the bottom of the inner liner body (3-1); the end of the first support portion (3-3) away from the inner liner body (3-1) is connected to the bottom surface of the shell (1); the second support portion (3-4) is arranged along the height direction of the inner liner body (3-1); the second support portion (3-4) is provided at the connection between the two side surfaces of the inner liner body (3-1); the length of the second support portion (3-4) is consistent with the height of the inner liner body (3-1); the end of the second support portion (3-4) away from the inner liner body (3-1) is connected to the corresponding inner side wall end of the shell (1).

5. The lithium battery for electric vehicles that is easy to install and replace according to claim 3, characterized in that: The side walls of the inner liner body (3-1) are all provided with air holes (3-5), a limiting plate (5) is installed on the top of the inner liner body (3-1), the four ends of the limiting plate (5) are respectively pressed against the inner side walls of the shell (1), and the limiting plate (5) is detachably connected to the shell (1).

6. The lithium battery for electric vehicles that is easy to install and replace according to claim 2, characterized in that: The handle (4-3) comprises a pull ring (4-4) and a fixing member (4-5); the interior of the pull ring (4-4) is a hollow structure; the pull ring (4-4) is rotatably connected to the fixing member (4-5); the fixing member (4-5) comprises a connecting plate (4-6) and a receiving chamber (4-7); there are two connecting plates (4-6); the ends of the two connecting plates (4-6) are respectively fixedly connected to the left and right sides of the receiving chamber (4-7); after the pull ring (4-4) is located in the receiving chamber (4-7), the connecting plate (4-6) is fastened to the shell cover body (4-1) by bolts.

7. An electric vehicle lithium battery that is easy to install and replace according to claim 6, characterized in that: The pull ring (4-4) is a square structure or a circular structure.

8. The lithium battery for electric vehicles that is easy to install and replace according to claim 1, characterized in that: The isolation board (2-4) is an epoxy resin glass fiber board.

Images