Ultralow-temperature lithium ion storage battery pack

Abstract

The invention relates to an ultralow-temperature lithium ion storage battery pack which comprises a battery body, a protective box body, a sealing strip, a locking device and a power assembly, the protection box body comprises an upper box body and a lower box body rotationally connected with the upper box body, a telescopic air cylinder is arranged in the lower box body, and the output end of the telescopic air cylinder is connected with the upper box body; the sealing strips are distributed on the outer side of the lower box body; the locking devices are arranged at the corners of the periphery of the upper box body and comprise supports fixedly connected with the upper box body and limiting blocks rotationally connected to the supports, displacement holes are formed in the supports, and the limiting blocks are in clearance fit with the displacement holes; and the power assembly is fixed on the lower box body. The lower box body is driven by the telescopic air cylinder to turn over into the upper box body, after the protective box body is closed, the power assembly is distributed on the side of the locking device, the locking device pushes the limiting block to turn over, the limiting block rotates around the rotating connecting part and moves along the displacement hole, rapid sealing is achieved, and temperature leakage is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery packs, and in particular to an ultra-low temperature lithium ion battery pack. Background Art

[0002] Ultra-low temperature lithium-ion battery packs are lithium-ion battery packs designed specifically for working in low temperature environments. Ordinary lithium-ion batteries often experience problems such as decreased capacity, increased internal resistance, and reduced cycle life in low temperature environments, resulting in decreased battery performance. Ultra-low temperature lithium-ion battery packs can maintain good battery performance in extremely low temperature environments by optimizing material selection, electrolyte formulation, and battery structure design. This type of battery pack is often used in scenarios that require low temperature working environments, such as aerospace, polar expeditions, and military equipment.

[0003] In low temperature environments, the sealing and waterproof performance of the battery may be affected, and low temperature can cause the seal to become hard or brittle, resulting in a decrease in sealing performance. Summary of the invention

[0004] Purpose of the invention: to provide an ultra-low temperature lithium-ion battery pack, thereby solving the above-mentioned problems existing in the prior art.

[0005] Technical solution: The present invention provides an ultra-low temperature lithium-ion battery pack, including a battery body, and also including:

[0006] The protective box includes an upper box and a lower box rotatably connected to the upper box, a telescopic cylinder is arranged inside the lower box, an output end of the telescopic cylinder is connected to the upper box, the lower box is driven by the telescopic cylinder to flip into the upper box, and the battery body is placed in the lower box;

[0007] A sealing strip is distributed on the outer side of the lower box body. When the lower box body is turned over and closed, the sealing strip is distributed between the upper box body and the lower box body;

[0008] A locking device is arranged at the four corners of the upper box body, and the locking device includes a bracket fixedly connected to the upper box body, and a limit block rotatably connected to the bracket, and a displacement hole is opened on the bracket, and the limit block is in clearance with the displacement hole;

[0009] A power assembly is fixed on the lower box body. After the protective box body is closed, the power assembly is distributed on the side of the locking device to push the limit block to flip. The limit block rotates around the rotating connection part and moves along the displacement hole.

[0010] The locking device is arranged correspondingly to the sealing strip. The protective box is opened and closed by a telescopic cylinder. The limit block moves along with the displacement block until the limit block fits with the inner wall of the upper box and squeezes the sealing strip between the upper box and the lower box to improve the sealing effect.

[0011] In a further embodiment, the limit block is rotatably connected to a fixed block, the end of the fixed block is fixedly connected to the bracket, the bracket is bent and extended to half surround the limit block and the fixed block, and the limit block and the fixed block are provided with a locking angle in the initial state.

[0012] One end of the fixed block is vertically threadedly connected to the bracket, and the end of the limit block passes through the other end of the fixed block through a pin or a rotating shaft, and the limit block can rotate around the end of the fixed block. An elastic pad is provided at the end of the limit block. After the limit block is turned over, the elastic pad fits the upper box to reduce the damage to the inner wall of the upper box when the limit block moves.

[0013] In a further embodiment, the bracket is bent upward from the side end of the fixing block to extend to the side end of the limiting block, the end of the bracket is inclined toward the fixing block, and the limiting block is located at the end of the bracket in an initial state.

[0014] After the limit block moves along the displacement hole on the bracket, the limit block fully squeezes the upper box body.

[0015] The displacement hole extends from the end of the fixed block to be flush with the center of the fixed block, so that when the limit block is displaced to the limit position of the displacement hole, it will no longer continue to displace, so as to avoid affecting the locking effect of the limit block on the upper box.

[0016] In a further embodiment, two sets of locking devices are provided at a single corner of the upper box body, and the locking devices are arranged at 90 degrees between each other. The power component is arranged between the two sets of locking devices. After the upper box body and the lower box body are closed, the power component pushes the limit block to rotate.

[0017] The locking devices correspond to the inner walls of the upper box body respectively. The upper and lower boxes are closed, the power assembly works, the limit block flips to the extreme position of the displacement hole, and then squeezes the sealing strip of the upper box body to fit tightly with the inner wall of the lower box body.

[0018] The power components are distributed between the two sets of locking devices, and at the same time drive the limit blocks on both sides to flip to improve the locking efficiency.

[0019] In a further embodiment, the power assembly comprises:

[0020] Gears, distributed on both sides of the limit block, and fixedly connected to both ends of the rotating shaft;

[0021] The rack is correspondingly distributed below the gear, and telescopic holes are opened on both sides of the bracket. The rack passes through the telescopic holes and meshes with the gear for transmission;

[0022] The pushing mechanism is fixed on the lower box body, and the top is close to the side end of the rack.

[0023] The pushing mechanism contacts the end of the rack, causing the rack to move linearly during the closing process of the upper and lower boxes, and drives the limit block to flip through the rotation of the gear. When the upper box is closed, the limit block is flush with the fixed block. At this time, the top of the mechanism is flush with the rack, and the rack stops moving.

[0024] In a further embodiment, the rack is provided with tooth grooves within a predetermined range, so as to mesh with the lower portion of the gear for transmission, and both ends of the rack are smooth ends, and the rack moves linearly along the bracket.

[0025] The meshing point between the rack and the gear moves from the leftmost end of the tooth groove to the rightmost end of the tooth groove. The opening range of the tooth groove is set according to the flipping angle of the limit block and the gear parameters, so that the gear drives the limit block to flip to a predetermined position, so as to control the flipping angle of the limit block and ensure that the elastic pad is in full contact with the inner wall of the upper box body after the limit block is flipped, thereby fully squeezing the sealing strip to improve the sealing effect.

[0026] In a further embodiment, a telescopic sleeve is provided at one end of the rack, and the telescopic sleeve is fixedly connected to the telescopic hole, and one end of the rack can arbitrarily telescopically move in the telescopic sleeve.

[0027] When the limit block is flipped, one end of the rack can be extended and retracted in the telescopic sleeve to avoid interference between the rack and the upper box. After the limit block is flipped, the smooth end of the rack is located in the telescopic sleeve, and the tooth groove is located outside the telescopic sleeve, thereby avoiding collision damage between the tooth groove and the telescopic sleeve.

[0028] In a further embodiment, the pushing mechanism includes a fixing rod, a first telescopic spring and a piston rod.

[0029] A fixing rod, fixed to the bottom of the lower box, with a stepped end provided above the fixing rod;

[0030] A first telescopic spring, sleeved on the step end and fixedly connected to the fixing rod;

[0031] The piston rod is fixed to the other end of the first telescopic spring and extends into the interior of the fixing rod to perform telescopic movement inside the fixing rod.

[0032] The top of the piston rod contacts the rack, and when the rack is gradually pressed down and close to the piston rod, the piston rod pushes the displacement of the rack, and then the rack drives the limit block to flip, quickly realize the flip, and improve the sealing and locking efficiency. When the upper box and the lower box are closed, vibrations will be generated, and these vibrations will be dispersed to the piston rod and the first telescopic spring. The first telescopic spring absorbs or stores these vibration forces to reduce the impact of the closing vibration of the upper and lower boxes on the battery pack.

[0033] In a further embodiment, an elastic sleeve is provided at the top of the piston rod, and the elastic sleeve is conical. The smooth end of the side end of the rack is provided with an inclined surface matching the conical end. When the large end of the elastic sleeve contacts the rack, the end of the rack abuts against the inner wall of the upper box body. At this time, the limit block is flush with the fixed block.

[0034] The conical surface of the elastic sleeve and the inclined surface of the rack abut against each other to form a point contact. The elastic sleeve is made of rubber and has a smooth surface to reduce movement friction so as to facilitate the movement of the rack. When the rack contacts the elastic sleeve, it can also deform to play a role of buffering and protection.

[0035] In a further embodiment, a telescopic rod is provided between the telescopic sleeve and the side end of the rack, and a second telescopic spring is provided on the outer sleeve of the telescopic rod.

[0036] The two ends of the telescopic rod are fixedly connected to the telescopic sleeve and the rack respectively, and the rack pushes the telescopic rod and the second telescopic spring when moving, thereby improving the stability of the rack movement. At the same time, when the upper box is opened, the second telescopic spring automatically pushes the rack to reset, and then the limit block automatically flips in the opposite direction.

[0037] Beneficial effects: The present invention relates to an ultra-low temperature lithium-ion battery pack, which protects the internal battery body through an openable upper box and a lower box, and controls the opening and closing through a telescopic cylinder, thereby improving the convenience of use. Locking devices are distributed around the interior of the upper box, and the locking devices are used in conjunction with a power component, so that when the box is closed, the sealing strip outside the upper box is automatically pushed to fit tightly with the inner wall of the lower box, thereby ensuring the sealing of the box and reducing temperature leakage. The power component is arranged in the lower box. When the box is closed, the power component provides a driving force for the limit block, and then the inner wall of the upper box is squeezed by the flippable limit block when the box is closed, thereby squeezing the sealing strip to fit with the lower box. The two sides of the limit block are driven to flip through gears and racks, and the side ends of the rack correspond to the piston rod. Then, when the box is closed, the inclined surface of the side ends of the rack abuts against the piston rod, thereby pushing the rack to move, pushing the limit block to flip, and realizing rapid sealing. A first telescopic spring is arranged outside the piston rod. When the piston rod abuts against the rack, buffering is achieved through the first telescopic spring, thereby reducing vibration transmission inside the box and improving the movement stability of the rack. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 It is a schematic diagram of the structure of the locking device and the power assembly in the present invention.

[0040] Figure 3It is a schematic diagram of the structure of the locking device and the power assembly in the present invention.

[0041] Figure 4 It is a schematic diagram of the internal structure of the telescopic sleeve in the present invention.

[0042] The reference numerals in the figure are: protective box 1, upper box 101, lower box 102, telescopic cylinder 2, sealing strip 3, locking device 4, bracket 401, limit block 402, displacement hole 403, power assembly 5, gear 501, rack 502, pushing mechanism 503, fixed rod 5031, first telescopic spring 5032, piston rod 5033, elastic sleeve 5034, fixed block 6, telescopic sleeve 7, telescopic rod 8, second telescopic spring 9, connecting plate 10, rotating shaft 11. DETAILED DESCRIPTION

[0043] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0044] The present invention provides an ultra-low temperature lithium-ion battery pack, including a battery body, including a protective box 1, a sealing strip 3 and a locking device 4. Among them, the protective box 1 includes an upper box 101 and a lower box 102 rotatably connected to the upper box 101, and a connecting plate 10 is provided inside the lower box 102. The connecting plate 10 extends to the side of the upper box 101 and is rotatably connected to the upper box 101 through a rotating shaft 11. A telescopic cylinder 2 is provided inside the lower box 102, and the output end of the telescopic cylinder 2 is connected to the upper box 101. The lower box 102 is driven by the telescopic cylinder 2 to flip into the upper box 101, and the battery body is placed in the lower box 102; the sealing strip 3 is fixed to the outside of the lower box 102, and when the lower box 102 is flipped and closed, the sealing strip 3 is distributed between the upper box 101 and the lower box 102; the locking device 4 is arranged at the four corners of the upper box 101, corresponding to the position of the sealing strip 3, and ... The device 4 includes a bracket 401 fixedly connected to the upper box body 101, and a limit block 402 rotatably connected to the bracket 401. A displacement hole 403 is opened on the bracket 401, and the limit block 402 is clearance-matched with the displacement hole 403. The power component 5 is fixed on the lower box body 102. After the protective box body 1 is closed, the power component 5 is distributed on the side of the locking device 4, which is used to push the limit block 402 to flip, and the limit block 402 rotates around the rotating connection part and moves along the displacement hole 403.

[0045] In the initial state, the limit block 402 is away from the inner wall of the upper box 101. The telescopic cylinder 2 is distributed around the battery body. When in use, the protective box 1 is opened and closed by the telescopic cylinder 2. The telescopic cylinder 2 pulls the upper box 101, and the upper box 101 flips along the rotating shaft 11. When flipping, the locking device 4 in the upper box 101 gradually approaches the lower box 102 and the power assembly 5. The power assembly 5 drives the limit block 402 to move along the displacement block, and the limit block 402 moves in line with the displacement hole 403 until the limit block 402 fits the inner wall of the upper box 101. After the limit block 402 rotates, it is flush with the sealing strip 3, and squeezes the sealing strip 3 between the upper box 101 and the lower box 102 through the upper box 101 to improve the sealing effect.

[0046] The limit block 402 is rotatably connected to the fixed block 6, and the limit block 402 can be turned around the rotation connection part. The end of the fixed block 6 is fixedly connected to the bracket 401, and the bracket 401 is bent and extended to half surround the limit block 402 and the fixed block 6. The limit block 402 and the fixed block 6 are initially provided with a locking angle.

[0047] One end of the fixed block 6 is vertically threadedly connected to the bracket 401, and the rotation direction of the thread is different from the flipping direction of the limit block 402, so that the work does not interfere with each other and the fixed block 6 is detachably connected, so as to facilitate the removal, replacement and maintenance of the fixed block 6 and the limit block 402 as a whole. The end of the limit block 402 passes through the other end of the fixed block 6 through a pin or a rotating shaft 11, so that the limit block 402 can rotate arbitrarily around the end of the fixed block 6.

[0048] An elastic pad is provided at the end of the limit block 402. The elastic pad is made of a rubber material with a smooth surface. After the limit block 402 is turned over, the elastic pad fits the upper box body 101 to reduce damage to the inner wall of the upper box body 101 when the limit block 402 moves.

[0049] The bracket 401 is bent upward from the side end of the fixing block 6 to the side end of the limit block 402, and the end of the bracket 401 is inclined toward the fixing block 6. The limit block 402 is initially located at the end of the bracket 401. The bent portion of the bracket 401 is located at the bottom, and the limit block 402 is initially in contact with the end of the displacement hole 403 under its own gravity, and the limit block 402 is away from the inner wall of the upper box body 101, so as to facilitate the protection of the box body 1 from closing.

[0050] When the limiting block 402 moves to the limit position along the displacement hole 403 on the bracket 401 , that is, when the limiting block 402 and the fixing block 6 are aligned with the same horizontal line, the limiting block 402 fully squeezes the upper box body 101 .

[0051] The displacement hole 403 extends from the end of the fixing block 6 to be flush with the center of the fixing block 6 , so that when the limit block 402 moves to the limit position of the displacement hole 403 , it will no longer move further to avoid affecting the locking effect of the limit block 402 on the upper box body 101 .

[0052] Two sets of locking devices 4 are provided at a single corner of the upper box 101, and the locking devices 4 are arranged at 90 degrees. The locking devices 4 correspond to the inner walls of the upper box 101 on all sides, so as to compress the different sides of the upper box 101, and then squeeze the end of the sealing strip 3 to ensure the sealing effect inside the protective box 1. A power assembly 5 is provided in the middle between the locking devices 4. After the upper box 101 and the lower box 102 are closed, the power assembly 5 pushes the limit block 402 to rotate. During the closing process of the upper and lower boxes 102, the power assembly 5 works and gradually pushes the limit block 402 to flip to the extreme position of the displacement hole 403. After the upper and lower boxes 102 are completely closed, the limit block 402 squeezes the sealing strip 3 of the upper box 101 and fits tightly with the inner wall of the lower box 102. The power assembly 5 is distributed between the two sets of locking devices 4, and at the same time drives the limit blocks 402 on both sides to flip, so as to improve the locking efficiency.

[0053] The power assembly 5 specifically includes a gear 501, a rack 502 and a pushing mechanism 503, wherein the gear 501 is distributed on both sides of the limit block 402, and the gear 501 is fixedly connected to both ends of the rotating shaft 11; the rack 502 is correspondingly distributed below the gear 501, and telescopic holes are opened on both sides of the bracket 401, and the rack 502 passes through the telescopic holes and meshes with the gear 501 for transmission; the pushing mechanism 503 is fixed on the lower box body 102, and the top is close to the side end of the rack 502. During the closing process of the upper box body 101, the pushing mechanism 503 is distributed between the racks 502 and contacts the side ends of the racks 502. The closing of the upper box body 101 drives the end of the rack 502 to fit the pushing mechanism 503 downward, and the pushing mechanism 503 pushes the rack 502 to move in a straight line in the opposite direction, and the gear 501 rotates clockwise, thereby driving the limit block 402 to flip clockwise. When the upper box body 101 is closed, the limit block 402 is flush with the fixed block 6. At this time, the top of the pushing mechanism 503 is flush with the rack 502, and the rack 502 stops moving.

[0054] The rack 502 is provided with tooth grooves within a predetermined range, and then meshes with the gear 501 below for transmission. Both ends of the rack 502 are smooth ends, and the rack 502 moves linearly along the bracket 401 .

[0055] In the initial state, the meshing point of the gear 501 and the rack 502 is close to the leftmost end of the tooth groove on the rack 502, and the tooth groove opening range is set according to the flipping angle of the limit block 402 and the parameters of the gear 501, so that when the gear 501 drives the limit block 402 to flip to a predetermined position, the meshing point of the rack 502 and the gear 501 moves to the rightmost end of the tooth groove, thereby effectively controlling the flipping angle of the limit block 402, so that after the limit block 402 is flipped, the elastic pad is fully in contact with the inner wall of the upper box body 101, so as to fully squeeze the sealing strip 3 and improve the sealing effect.

[0056] A telescopic sleeve 7 is provided at one end of the rack 502 . The telescopic sleeve 7 is fixedly connected to the telescopic hole. One end of the rack 502 can move arbitrarily within the telescopic sleeve 7 .

[0057] The side wall of the bracket 401 is attached to and fixedly connected with the inner wall of the upper box body 101. When the rack 502 is pushed and moved, the end portion is retracted to the telescopic sleeve 7 to avoid interference between the rack 502 and the upper box body 101. Before the rack 502 moves, the end portion of the rack 502 is located in the telescopic sleeve 7, and the spacing between the end portion of the rack 502 and the end portion of the tooth groove is greater than or equal to the rack 502 being pushed into the telescopic sleeve 7. After the limit block 402 is turned over, the smooth end of the rack 502 is located in the telescopic sleeve 7, and the tooth groove is located outside the telescopic sleeve 7 to avoid contact between the tooth groove and the telescopic sleeve 7 and damage.

[0058] The pushing mechanism 503 specifically includes a fixed rod 5031, a first telescopic spring 5032, and a piston rod 5033. The fixed rod 5031 is fixed to the bottom of the lower box 102, and a step end is provided above the fixed rod 5031; the first telescopic spring 5032 is sleeved on the step end and fixedly connected to the fixed rod 5031; the piston rod 5033 is fixed to the other end of the first telescopic spring 5032, and extends to the inside of the fixed rod 5031, and then the end of the piston rod 5033 telescopically moves inside the fixed rod 5031.

[0059] When the upper box 101 is closed, the outer periphery of the piston rod 5033 pushes the rack 502 to move, thereby completing the flipping of the limit block 402 and improving the sealing and locking efficiency. When the piston rod 5033 contacts the rack 502, the vibration generated when the upper box 101 and the lower box 102 are closed is dispersed to the piston rod 5033 and the telescopic spring, and then the first telescopic spring 5032 absorbs or stores the vibration force to reduce the impact of the closing vibration of the upper and lower boxes 102 on the battery pack.

[0060] An elastic sleeve 5034 is provided on the top of the piston rod 5033. The elastic sleeve 5034 is conical. The smooth end of the side end of the rack 502 is provided with an inclined surface that matches the conical end. When the large end of the elastic sleeve 5034 contacts the rack 502, the end of the rack 502 abuts against the inner wall of the upper box body 101. At this time, the limit block 402 is flush with the fixed block 6.

[0061] When the upper box 101 is turned over, the conical surface of the elastic sleeve 5034 and the inclined surface of the rack 502 abut against each other to form a point contact, so that the force transmission is more stable and the transmission of the impact force is reduced. The elastic sleeve 5034 is made of rubber and has a smooth surface to facilitate the movement of the rack 502. When the rack 502 contacts the elastic sleeve 5034, it can deform and automatically recover, thereby slowing down the transmission of the impact force and playing a role of buffering and protection.

[0062] A telescopic rod 8 is provided between the telescopic sleeve 7 and the side end of the rack 502 , and a second telescopic spring 9 is provided on the outer sleeve of the telescopic rod 8 .

[0063] The two ends of the telescopic rod 8 are respectively fixedly connected to the telescopic sleeve 7 and the rack 502. When the piston rod 5033 pushes the rack 502 to move, the rack 502 pushes the telescopic rod 8 and the second telescopic spring 9. The telescopic rod 8 and the second telescopic spring 9 are compressed, so that the rack 502 stably moves in a straight line. When the upper box 101 is opened, the side end of the rack 502 gradually moves away from the piston rod 5033, and the second telescopic spring 9 automatically pushes the rack 502 to move in the opposite direction, thereby driving the limit block 402 to flip in the opposite direction. When the second telescopic spring 9 is in a free state, the limit block 402 returns to its initial position.

[0064] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An ultra-low temperature lithium-ion battery pack, comprising a battery body, characterized in that: Also includes: The protective box includes an upper box and a lower box rotatably connected to the upper box, a telescopic cylinder is arranged inside the lower box, an output end of the telescopic cylinder is connected to the upper box, the lower box is driven by the telescopic cylinder to flip into the upper box, and the battery body is placed in the lower box; A sealing strip is distributed on the outer side of the lower box body. When the lower box body is turned over and closed, the sealing strip is distributed between the upper box body and the lower box body; A locking device is arranged at the four corners of the upper box body, and the locking device includes a bracket fixedly connected to the upper box body, and a limit block rotatably connected to the bracket, and a displacement hole is opened on the bracket, and the limit block is in clearance with the displacement hole; A power assembly is fixed on the lower box body. After the protective box body is closed, the power assembly is distributed on the side of the locking device to push the limit block to flip. The limit block rotates around the rotating connection part and moves along the displacement hole.

2. The ultra-low temperature lithium-ion battery pack according to claim 1, characterized in that: The limit block is rotatably connected to a fixed block, a terminal end of the fixed block is fixedly connected to the bracket, the bracket is bent and extended to half surround the limit block and the fixed block, and a locking angle is provided between the limit block and the fixed block in an initial state.

3. The ultra-low temperature lithium-ion battery pack according to claim 2, characterized in that: The bracket is bent upward from the side end of the fixing block and extends to the side end of the limiting block. The end of the bracket is inclined toward the fixing block. The limiting block is located at the end of the bracket in an initial state.

4. The ultra-low temperature lithium-ion battery pack according to claim 1, characterized in that: Two sets of locking devices are provided at a single corner of the upper box body, and the locking devices are arranged at 90 degrees between each other. The power component is arranged between the two sets of locking devices. After the upper box body and the lower box body are closed, the power component pushes the limit block to rotate.

5. The ultra-low temperature lithium-ion battery pack according to claim 4, characterized in that: The power assembly comprises: Gears, distributed on both sides of the limit block, and fixedly connected to both ends of the rotating shaft; The rack is correspondingly distributed below the gear, and telescopic holes are opened on both sides of the bracket. The rack passes through the telescopic holes and meshes with the gear for transmission; The pushing mechanism is fixed on the lower box body, and the top is close to the side end of the rack.

6. The ultra-low temperature lithium-ion battery pack according to claim 5, characterized in that: The rack is provided with tooth grooves within a predetermined range, and is meshed with the lower part of the gear for transmission. Both ends of the rack are smooth ends, and the rack moves linearly along the bracket.

7. The ultra-low temperature lithium-ion battery pack according to claim 6, characterized in that: A telescopic sleeve is provided at one end of the rack, and the telescopic sleeve is fixedly connected to the telescopic hole. One end of the rack can arbitrarily telescope in the telescopic sleeve.

8. The ultra-low temperature lithium-ion battery pack according to claim 5, characterized in that: The driving mechanism comprises: A fixing rod, fixed to the bottom of the lower box, with a stepped end provided above the fixing rod; A first telescopic spring, sleeved on the step end and fixedly connected to the fixing rod; The piston rod is fixed to the other end of the first telescopic spring and extends into the interior of the fixing rod to perform telescopic movement inside the fixing rod.

9. The ultra-low temperature lithium-ion battery pack according to claim 8, characterized in that: An elastic sleeve is provided on the top of the piston rod, and the elastic sleeve is conical. The smooth end of the side end of the rack is provided with an inclined surface that matches the conical end. When the large end of the elastic sleeve contacts the rack, the end of the rack abuts against the inner wall of the upper box body. At this time, the limit block is flush with the fixed block.

10. The ultra-low temperature lithium-ion battery pack according to claim 9, characterized in that: A telescopic rod is arranged between the telescopic sleeve and the side end of the rack, and a second telescopic spring is arranged on the outer sleeve of the telescopic rod.

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