A safe lithium battery pack for new energy vehicles

Abstract

The present invention relates to the technical field of lithium battery packs, and in particular to a safe lithium battery pack for new energy vehicles. The present invention comprises a shell, the shell being provided with a plurality of accommodating cavities, the accommodating cavities of the shell being detachably connected to a connecting shell, the connecting shell being slidably connected to a bottom plate, the bottom plate being detachably connected to a plurality of battery cells, the bottom plate being provided with a storage slot, the storage slot being slidably connected to symmetrically distributed limit blocks, the storage slot being slidably connected to a centrally symmetrical fixing rod, the fixing rod being fixedly connected to the adjacent limit blocks, and the storage slot being provided with an airbag. The present invention separates the bottom plate and the battery cells thereon from the shell when the temperature in the accommodating cavity continues to rise, thereby reducing the influence of the battery cell on the other battery cells during the process of continuously rising temperature, reducing the risk of fire or explosion, and also facilitating subsequent targeted replacement or repair, thereby reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery packs, and in particular to a safe lithium battery pack for new energy vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, the safety and reliability of lithium-ion battery packs, as a core power source, have attracted significant attention. In practical applications, lithium-ion battery packs typically consist of multiple cells connected in series and parallel. Inconsistencies between cells, local overloads, or external environmental factors can cause abnormal heating in individual cells. Failure to promptly suppress heat accumulation in overheated cells can easily trigger a thermal runaway chain reaction, threatening vehicle safety.

[0003] Currently, new energy vehicle lithium-ion battery packs generally utilize air-cooling or liquid-cooling thermal management solutions. During normal use, if a single cell experiences an abnormal temperature, the battery management system (BMS) will first reduce the drive or charging power to reduce internal heat generation and enhance heat dissipation in that cell. If the cell temperature continues to rise, the BMS will immediately disconnect the high-voltage relay (disconnecting the high-voltage main circuit). While this action cuts off energy input to the abnormal cell, suppressing further heat generation, the accumulated heat in that cell will still transfer to adjacent cells through thermal conduction (physical contact), convection (air flow), and radiation, causing their temperatures to rise, thereby affecting the safety and performance of the entire battery pack. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a safe lithium battery pack for new energy vehicles.

[0005] The technical implementation scheme of the present invention is: a safe lithium battery pack for new energy vehicles, comprising a shell, the shell being provided with a plurality of accommodating cavities, the accommodating cavities of the shell being provided with a liquid cooling plate, the accommodating cavities of the shell being detachably connected to a connecting shell, the connecting shell being slidably connected to a bottom plate, the bottom plate being detachably connected to a plurality of battery cells, two adjacent battery cells being connected via electrode sheets, the bottom plate being provided with a storage slot, the storage slot being slidably connected to symmetrically distributed limit blocks, the storage slot being slidably connected to a centrally symmetrical fixing rod, the fixing rod being fixedly connected to the adjacent limit blocks, the storage slot being provided with an airbag, the airbag being fixedly connected to the centrally symmetrical fixing rod, the connecting shell being provided with symmetrically distributed limit slots, the limit blocks sliding in the adjacent limit slots.

[0006] More preferably, it also includes several separation components, the number of which is the same as the number of the accommodating cavities of the shell, the separation components are arranged in the adjacent accommodating cavities of the shell, and the separation components are used to actively push out the battery cells in the accommodating cavities of the shell, the separation components include a storage shell, a storage bag, an extrusion plate and a blocking block, the storage shell is fixedly connected to the adjacent accommodating cavities of the shell, the lower side of the storage shell is provided with a flow hole, the storage bag is fixedly connected to the lower side of the storage shell, the extrusion plate is fixedly connected to the lower side of the storage bag for squeezing the adjacent battery cells, the blocking block is slidably connected to the extrusion plate, the blocking block is used to block the flow hole on the storage shell, the storage bag is slidingly connected to the blocking block in a limiting seal, and the storage bag and the storage shell are controllably connected through the blocking block.

[0007] More preferably, the internal space of the storage shell is in the shape of a frustum.

[0008] More preferably, the separation assembly further includes a plurality of cutting knives, wherein the cutting knives are fixed to one side of the extrusion plate, and the cutting knives are used to cut off the electrode sheets on the adjacent battery cells during movement.

[0009] More preferably, the separation component also includes a connecting rod, which is arranged on the adjacent base plate, and the connecting rod is slidably and rotatably connected to the blocking block, the blocking block is provided with a limiting ring groove, and the connecting rod is slidably connected to a limiting ball sliding in the limiting ring groove, and a spring is fixed between the limiting ball and the connecting rod.

[0010] More preferably, the cross section of the limiting ring groove is arc-shaped, the diameter of the circle where the cross section of the limiting ring groove is located is equal to the diameter of the limiting ball, and the depth of the limiting ring groove is smaller than the diameter of the limiting ball.

[0011] More preferably, it also includes a plurality of connecting columns, the number of which is consistent with the number of the base plates, the connecting columns are provided with external threads, the connecting columns are threadedly connected to the adjacent base plates through the external threads thereon, the lower ends of the connecting rods are provided with spline portions, the connecting columns are provided with spline grooves for the adjacent connecting rods to slide, and the base plates are provided with spline grooves for the adjacent connecting rods to slide.

[0012] More preferably, the projection of the spline groove on the base plate on the horizontal plane does not overlap with the projection of the spline groove on the adjacent connecting column on the horizontal plane.

[0013] More preferably, the housing cavity of the housing is fixed with fixed blocks distributed in a matrix, and the bottom plate is fixed with extrusion blocks distributed symmetrically, and the fixed blocks are used to extrude adjacent extrusion blocks.

[0014] More preferably, the extrusion block is made of a flexible material and is provided with a shuttle-shaped through hole.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention separates the bottom plate and the battery cell thereon from the outer shell when the temperature in the accommodation cavity continues to rise, thereby reducing the impact of the battery cell on other battery cells during the process of continuously rising temperature, reducing the risk of fire or explosion, and also facilitating subsequent targeted replacement or maintenance, thereby reducing costs.

[0016] During the movement of the bottom plate, the transmission blocking block moves synchronously, so that the storage shell and the storage bag are connected, so that the medicine in the storage shell reacts with the medicine in the storage bag and releases a large amount of gas, causing the storage bag to expand. The storage bag pushes the extrusion plate during the expansion process, and the extrusion plate pushes the two battery cells to move downward synchronously, thereby accelerating the speed of removing the two battery cells from the accommodating cavity of the shell.

[0017] The deformation caused by the extrusion block is used to enhance the position stability of adjacent battery cells during normal use. At the same time, when the bottom plate moves downward, the extrusion block is gradually reset under the action of its own elastic force, providing a downward force on the adjacent bottom plate, thereby accelerating the separation speed of the bottom plate and the adjacent connecting shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 is a sectional view of the three-dimensional structure of the housing of the present invention;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the base plate and battery core of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the fixed block and the extrusion block of the present invention;

[0022] Figure 5 This is a sectional view of the three-dimensional structure of the storage shell of the present invention;

[0023] Figure 6 This is an exploded view of the connecting shell and the limiting block of the present invention;

[0024] Figure 7 This is a sectional view of the three-dimensional structure of the storage bag and the extrusion plate of the present invention;

[0025] Figure 8 This is a sectional view of the three-dimensional structure of the blocking block of the present invention;

[0026] Figure 9 It is a three-dimensional structural cross-sectional view of the connecting column of the present invention.

[0027] In the above drawings: 1. outer shell, 2. connecting shell, 3. bottom plate, 4. battery cell, 5. storage slot, 6. limit block, 7. fixing rod, 8. airbag, 9. limit slot, 10. storage shell, 11. storage bag, 12. extrusion plate, 13. blocking block, 14. cutting knife, 15. connecting rod, 151. limit ring groove, 152. limit ball, 18. connecting column, 19. fixing block, 20. extrusion block. DETAILED DESCRIPTION

[0028] First of all, it should be noted that in the various embodiments described, identical components are provided with identical reference numerals or identical component names, wherein the disclosure contained throughout the entire description can be transferred to the same components having the same reference numerals or identical component names. Positional designations selected in the description, such as top, bottom, lateral, etc., also refer to the directly described and illustrated figures and are transferred to the new position in the event of a change in position.

[0029] Example 1

[0030] This embodiment discloses a safe lithium battery pack for new energy vehicles, which aims to improve existing lithium battery packs for new energy vehicles.

[0031] like Figures 1-6As shown, a safe lithium battery pack for new energy vehicles includes a shell 1, which is composed of an upper cover and a shell, which are fixed by bolts. The shell 1 is provided with a circuit that can be electrically connected to the main circuit of the car. The shell 1 is provided with a plurality of accommodating cavities, and the specific number of accommodating cavities is specifically selected by the staff. A liquid cooling plate is provided on the peripheral side of the accommodating cavity of the shell 1, and a coolant is stored in the liquid cooling plate to reduce the temperature of the adjacent accommodating cavity. The shell 1 is provided with a temperature sensor for detecting the temperature in its accommodating cavity, and the temperature sensor is electrically connected to the car control terminal. A connecting shell 2 is detachably connected to the accommodating cavity of the shell 1, and the connecting shell 2 is connected to the shell 1 by bolts. The interior of the connecting shell 2 is slidably connected to a bottom plate 3, and the bottom plate 3 slides up and down along the adjacent connecting shell 2. A plurality of battery cells 4 are detachably connected to the bottom plate 3, and the specific number of battery cells 4 on the same bottom plate 3 is specifically selected by the staff. The figure and the text both take two as an example. Two adjacent battery cells 4 are connected by electrode sheets, and the electrode sheets on two adjacent battery cells 4 in different storage cavities pass through the outer shell 1. The bottom plate 3 is provided with a storage slot 5, and two symmetrically distributed limit blocks 6 are slidably connected in the storage slot 5. The limit blocks 6 are n-shaped, and two centrally symmetrical fixed rods 7 are slidably connected in the storage slot 5. The fixed rods 7 are fixedly connected to adjacent limit blocks 6, and the adjacent limit blocks 6 are driven to move by the fixed rods 7. An airbag 8 is provided in the storage slot 5, and the airbag 8 is filled with gas that expands due to heat. The airbag 8 is fixedly connected to the centrally symmetrical fixed rod 7. The fixed positions of the two fixing rods 7 and the adjacent airbags 8 are respectively located on the left and right sides of the adjacent airbags 8. The airbag 8 drives the two adjacent fixed rods 7 to move during the expansion process. The connecting shell 2 is provided with four limit slots 9 distributed in a matrix, and the limit blocks 6 slide in the adjacent limit slots 9. In the normal state, the limit blocks 6 are located in the adjacent limit slots 9, connecting the connecting shell 2 with the adjacent bottom plate 3.

[0032] The specific workflow of the above solution is as follows:

[0033] The staff fixed the two battery cells 4 to the same base plate 3 in turn, and then moved the connecting shell 2 upward. The connecting shell 2 drove the two adjacent battery cells 4 to move upward through the base plate 3, so that the battery cells 4 gradually entered the adjacent accommodating cavities on the outer shell 1. When the connecting shell 2 moved upward to contact the lower side of the liquid cooling plate in the adjacent accommodating cavity on the outer shell 1, the connecting shell 2 moved upward to the extreme position relative to the outer shell 1, and the staff used bolts to connect the connecting shell 2 to the outer shell 1, and completed the installation of the remaining connecting shells 2 in sequence according to the above operations. After the installation is completed, the staff connected the two adjacent battery cells 4 through the electrode sheet, and connected the battery cell 4 to the circuit on the outer shell 1. After the connection is completed, the upper cover of the outer shell 1 and the shell are fixed with bolts. Then the staff fixed the outer shell 1 to the chassis of the car with bolts, connected the circuit on the shell 1 to the main circuit of the car, and connected the liquid cooling plate to the car's cooling device. Then the device can be put into use.

[0034] During the use of this device, the automobile cooling device controls the flow of coolant into the liquid cold plate, and absorbs the heat generated by the battery cell 4 through heat exchange, maintaining the temperature in the accommodating cavity of the shell 1 within a specified range to maintain the normal operation of the battery cell 4 and also maintain the stability of the gas volume in the airbag 8. During this process, the temperature sensor on the shell 1 monitors the temperature in all the accommodating cavities of the shell 1 and transmits the monitoring results to the automobile control terminal. When an abnormal temperature is detected in one of the accommodating cavities (taking the accommodating cavity on the left front side as an example), the control terminal controls the automobile cooling device to enhance the heat dissipation effect of the accommodating cavity on the left front side and issues an alarm in the car cab to remind the driver.

[0035] After enhancing the heat dissipation effect of the left front accommodating cavity, if the temperature in the left front accommodating cavity drops, it indicates that the temperature abnormality may be caused by uneven heat dissipation, which means that the device can still be used, and the temperature of the overheated battery cell 4 will gradually drop to normal temperature after the heat dissipation effect is enhanced. Then the control terminal controls the automobile heat dissipation device to normally dissipate heat and cool the device; if the temperature in the left front accommodating cavity continues to rise, it indicates that the left front battery cell 4 has a fault. At this time, the control terminal issues a warning in the cab, reminding the driver to pull over and slow down. At this time, the gas in the airbag 8 expands due to heat (such as nitrogen, etc.), and the airbag 8 squeezes the two adjacent fixed rods 7 during the expansion process, causing the two fixed rods 7 to move, and the two fixed rods 7 respectively drive the adjacent limit blocks 6 to move synchronously, so that the two limit blocks 6 are close to each other, and the limit blocks 6 gradually lose contact with the adjacent limit grooves 9.

[0036] When the two limit blocks 6 lose contact with the adjacent limit slots 9 (the control terminal disconnects the housing 1 from the vehicle's main circuit), the bottom plate 3 on the left front side and the two battery cells 4 on the left front side move downward due to their own gravity, thereby separating the battery cell 4 on the left front side from the housing 1, thereby reducing the impact of the battery cell 4 on the left front side on the other battery cells 4 during the process of continuously rising temperature, reducing the risk of fire or explosion, and also reducing the subsequent replacement or repair costs.

[0037] After the abnormal cell 4 is separated from the housing 1, the control terminal issues an alarm in the cab to remind the driver that the abnormal cell 4 has been separated. When the cell 4 needs to be replaced, the staff will remove the bolts on the left front connecting shell 2 in sequence and then disassemble the connecting shell 2 normally.

[0038] Example 2

[0039] This embodiment discloses a safe lithium battery pack for new energy vehicles, which is optimized based on the above embodiments.

[0040] like Figure 3-Figure 5 and Figure 7 As shown, it also includes several separation components, the number of which is the same as the number of the accommodating cavities of the shell 1, and the separation components are arranged in the accommodating cavities adjacent to the shell 1. The separation components are used to actively push out the battery core 4 in the accommodating cavity of the shell 1, and the separation components include a storage shell 10, a storage capsule 11, an extrusion plate 12 and a blocking block 13. The storage shell 10 is fixedly connected to the accommodating cavity adjacent to the shell 1, and a flow hole is provided on the lower side of the storage shell 10. Liquid medicines are stored in the storage shell 10, and the storage capsule 11 is fixedly connected to the lower side of the storage shell 10. The storage capsule 11 is made of elastic deformable material, and solid medicines are stored in the storage capsule 11. The liquid in the storage shell 10 and the solid in the storage capsule 11 can react and produce a large amount of gas. The specific types of medicines in the two can be specifically selected by the staff ( Such as the reaction of hydrogen peroxide and manganese dioxide), so that the storage bag 11 expands, the extrusion plate 12 is fixed to the lower side of the storage bag 11, and the lower side of the extrusion plate 12 is provided with a rubber layer for maintaining the stability of the adjacent battery cells 4. The storage bag 11 drives the extrusion plate 12 to move downward during the expansion process to extrude the adjacent battery cells 4. The blocking block 13 is slidably connected to the extrusion plate 12. The blocking block 13 is used to block the flow hole on the storage shell 10. The blocking block 13 passes through the storage bag 11 and is slidably connected to the storage shell 10 with a limit seal. The storage bag 11 and the storage shell 10 are controllably connected through the blocking block 13, wherein the blocking block 13 is composed of a cylinder and a ring. The ring of the blocking block 13 is always located in the adjacent storage bag 11. Under normal conditions, the adjacent storage shells 10 and the storage bag 11 are blocked by the blocking block 13.

[0041] like Figure 5 and Figure 7 As shown, the internal space of the storage shell 10 is in a frustum shape, which is used to guide the liquid medicine in the storage shell 10 so that the liquid medicine in the storage shell 10 can smoothly enter the adjacent storage bag 11.

[0042] like Figure 3-Figure 5 As shown, the separation component also includes a plurality of cutting knives 14. The specific number of the cutting knives 14 is selected by the staff. The cutting knives 14 are fixed to the extrusion plate 12. The cutting knives 14 are used to cut off the electrode sheets on adjacent battery cells 4 during movement, thereby reducing the impact of the battery cells 4 on the remaining battery cells 4 during movement.

[0043] like Figure 4-Figure 8As shown, the separation component also includes a connecting rod 15, which is arranged on the adjacent base plate 3. The base plate 3 drives the connecting rod 15 to move synchronously. The connecting rod 15 is slidably and rotatably connected to the blocking block 13. The blocking block 13 is provided with a limiting ring groove 151. The connecting rod 15 is slidably connected to a limiting ball 152 that slides in the limiting ring groove 151. A spring is fixed between the limiting ball 152 and the connecting rod 15. The connecting rod 15 drives the adjacent blocking block 13 to move downward synchronously through the transmission of the adjacent limiting ball 152.

[0044] like Figure 8 As shown, the cross-section of the limiting ring groove 151 is arc-shaped, the diameter of the circle where the cross-section of the limiting ring groove 151 is located is equal to the diameter of the limiting ball 152, and the depth of the limiting ring groove 151 is smaller than the diameter of the limiting ball 152, so that the blocking block 13 can be separated from the adjacent connecting rod 15.

[0045] like Figure 6 and Figure 9 As shown, it also includes several connecting columns 18, the number of which is consistent with the number of base plates 3, the connecting columns 18 are provided with external threads, and the connecting columns 18 are threadedly connected to the adjacent base plates 3 through the external threads thereon, the lower end of the connecting rod 15 is provided with a spline portion, and the connecting column 18 is provided with a spline groove for the adjacent connecting rod 15 to slide, and the connecting column 18 drives the adjacent connecting rods 15 to rotate synchronously through the spline groove thereon during the rotation process, and the base plate 3 is provided with a spline groove for the adjacent connecting rod 15 to slide, which is used to connect the base plate 3 with the adjacent connecting rod 15. Under normal conditions, the spline groove on the base plate 3 is not aligned with the spline portion on the adjacent connecting rod 15, so that the base plate 3 can drive the adjacent connecting rod 15 to move synchronously during the downward movement.

[0046] like Figure 9 As shown, when the connecting column 18 contacts the adjacent connecting rod 15, the projection of the spline groove on the base plate 3 on the horizontal plane does not coincide with the projection of the spline groove on the adjacent connecting column 18 on the horizontal plane. The angle between the two is represented as 90° in the figure and the text, so that the base plate 3 can drive the adjacent connecting rod 15 in the initial state to move.

[0047] The specific workflow of the above solution is as follows:

[0048] Before installing the connecting shell 2 on the left front side, the staff first rotates the connecting rod 15 so that the spline portion on the lower side of the connecting rod 15 is aligned with the spline groove on the bottom plate 3, and rotates the connecting column 18 (to Figure 9The perspective from top to bottom is the reference perspective, the rotation direction is clockwise, and the rotation angle is 90°), so that the spline groove on the connecting column 18 is aligned with the spline groove on the bottom plate 3, and then the connecting shell 2 is moved upward according to the above operation. In the process of the connecting shell 2 driving the two adjacent battery cells 4 to move upward through the adjacent bottom plate 3, the spline portion on the lower side of the connecting rod 15 first enters the spline groove on the bottom plate 3. In the process of the bottom plate 3 continuing to move upward, the bottom plate 3 drives the connecting column 18 to move upward, so that the spline portion on the connecting rod 15 enters the connecting column 18. When the two battery cells 4 move upward to a position in contact with the adjacent extrusion plate 12, the connecting shell 2 can still continue to move upward. Movement, in the process of the connecting shell 2 driving the two adjacent battery cells 4 to continue to move upward, the battery cells 4 squeeze the rubber layer on the lower side of the adjacent extrusion plate 12, and the rubber layer on the lower side of the extrusion plate 12 is deformed, thereby increasing the fixing force on the battery cells 4 and maintaining the stability of the position of the battery cells 4 during use. After the connecting shell 2 moves upward to contact the adjacent liquid cooling plate, the spline portion on the connecting rod 15 loses contact with the spline groove on the adjacent bottom plate 3. Then the staff rotates the connecting column 18 (90° counterclockwise) to make the connecting column 18 drive the connecting rod 15 to rotate, and the spline portion on the connecting rod 15 is misaligned with the spline groove on the bottom plate 3, connecting the connecting rod 15 to the adjacent bottom plate 3.

[0049] In the process of the bottom plate 3 on the left front side driving the two battery cells 4 thereon to move downward, the bottom plate 3 drives the adjacent connecting rod 15 to move downward synchronously through the adjacent connecting column 18, and the connecting rod 15 drives the adjacent blocking block 13 to move downward synchronously through the adjacent limiting ball 152, so that the blocking block 13 moves downward relative to the adjacent storage shell 10 and the adjacent storage capsule 11. In the process of the blocking block 13 moving downward, the blocking block 13 first loses contact with the flow hole of the storage shell 10, so that the storage shell 10 is connected with the storage capsule 11, and then the liquid stored in the storage shell 10 flows into the storage capsule 11, reacts with the solid medicine in the storage capsule 11, and releases a large amount of gas, causing the storage capsule 11 to expand, and the storage capsule 11 pushes the extrusion plate 12 to move downward during the expansion process. The extrusion plate 12 pushes the two battery cells 4 to move downward synchronously, thereby accelerating the speed of removing the two battery cells 4 from the accommodating cavity of the outer shell 1.

[0050] During the downward movement of the extrusion plate 12, the extrusion plate 12 drives the cutting knife 14 to move downward synchronously, and the cutting knife 14 cuts off the adjacent electrode sheets during the downward movement, thereby disconnecting the two battery cells 4 on the left front side from the remaining battery cells 4, reducing the damage caused by the two battery cells 4 on the left front side to the remaining battery cells 4 during the downward movement.

[0051] When the extrusion plate 12 moves downward to the limit position, the bottom plate 3 can continue to move downward. During the subsequent movement of the bottom plate 3, the bottom plate 3 continues to drive the connecting rod 15 to move through the connecting column 18, and the connecting rod 15 drives the limiting ball 152 to move, so that the limiting ball 152 is squeezed by the limiting ring groove 151 and moves to a position close to the central axis of the connecting rod 15, so that the limiting ball 152 gradually loses contact with the limiting ring groove 151. When the limiting ball 152 loses contact with the limiting ring groove 151, the connecting rod 15 moves downward relative to the blocking block 13, so that the connecting rod 15 is gradually separated from the blocking block 13, so that the two battery cells 4 on the left front side can be completely separated from the outer shell 1.

[0052] During the use of the device, if the connection shell 2 needs to be disassembled normally, the staff will first rotate the connection column 18 90 degrees (to Figure 9 The perspective from top to bottom is the reference perspective, and the rotation direction is clockwise). During the rotation process, the connecting column 18 drives the connecting rod 15 to rotate synchronously by 90° through the spline groove thereon, so that the spline on the connecting rod 15 is aligned with the spline groove on the adjacent base plate 3. The staff can then remove the connecting shell 2. During the removal of the connecting shell 2, the connecting rod 15 moves upward along the spline groove on the base plate 3, so that the connecting rod 15 is separated from the base plate 3, thereby maintaining the stability of the position of the blocking block 13 during the normal disassembly of the connecting shell 2.

[0053] Example 3

[0054] This embodiment discloses a safe lithium battery pack for new energy vehicles, which is optimized based on the above embodiments.

[0055] like Figure 3 and Figure 4 As shown, four fixed blocks 19 distributed in a matrix are fixed in the accommodating cavity of the shell 1, and two symmetrically distributed extrusion blocks 20 are fixed on the bottom plate 3. The fixed blocks 19 are used to squeeze adjacent extrusion blocks 20 to deform the adjacent extrusion blocks 20. The extrusion blocks 20 are made of flexible material and are provided with shuttle-shaped through holes. When the extrusion blocks 20 are squeezed by the adjacent fixed blocks 19, the middle part of the extrusion blocks 20 moves to the left and right sides, thereby increasing the projected area of ​​the extrusion blocks 20 on the horizontal plane, thereby increasing the extrusion force between the extrusion blocks 20 and the adjacent battery cells 4, and maintaining the stability of the position of the battery cells 4 during use.

[0056] The specific workflow of the above solution is as follows:

[0057] In the process of the connecting shell 2 driving the adjacent bottom plate 3 to move upward, the bottom plate 3 drives the two adjacent extrusion blocks 20 to move upward synchronously until the upper side surfaces of the two extrusion blocks 20 respectively contact the adjacent fixed blocks 19. The connecting shell 2 can still continue to move upward. At the same time, in the process of the connecting shell 2 driving the adjacent extrusion blocks 20 to continue to move upward, the adjacent extrusion blocks 20 are intercepted by the fixed blocks 19, so that the extrusion blocks 20 are deformed by the extrusion of the adjacent fixed blocks 19 and the adjacent bottom plate 3, and the deformed extrusion blocks 20 fill the gaps between the adjacent battery cells 4 and the adjacent liquid cooling plates, so that the adjacent battery cells 4 remain stable during normal use.

[0058] During the process of the bottom plate 3 moving downward relative to the adjacent connecting shell 2, the extrusion force of the bottom plate 3 on the adjacent extrusion block 20 is reduced, so that the extrusion block 20 gradually returns to its original position under the action of its own elastic force, and drives the adjacent bottom plate 3 to move downward, providing a downward force on the adjacent bottom plate 3, thereby accelerating the separation speed of the bottom plate 3 and the adjacent connecting shell 2.

[0059] It should be understood that the above description is for illustrative purposes only and is not intended to limit the present invention. The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for the purpose of explaining the principles of the embodiments of the present invention and should not be interpreted in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can conceive of other specific implementations of the embodiments of the present invention without any creative effort, and these implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A safe lithium battery pack for new energy vehicles, characterized by: The invention comprises a shell (1), wherein the shell (1) is provided with a plurality of accommodating cavities, wherein the accommodating cavities of the shell (1) are provided with a liquid cooling plate, wherein the accommodating cavities of the shell (1) are detachably connected to a connecting shell (2), wherein the connecting shell (2) is slidably connected to a bottom plate (3), wherein a plurality of battery cells (4) are detachably connected to the bottom plate (3), wherein two adjacent battery cells (4) are connected via electrode sheets, wherein the bottom plate (3) is provided with a storage groove (5), wherein symmetrically distributed limiting blocks (6) are slidably connected to the storage groove (5), wherein a centrally symmetrical fixing rod (7) is slidably connected to the storage groove (5), wherein the fixing rod (7) is fixedly connected to the adjacent limiting blocks (6), wherein an air bag (8) is provided in the storage groove (5), wherein the air bag (8) is fixedly connected to the centrally symmetrical fixing rod (7), wherein the connecting shell (2) is provided with symmetrically distributed limiting grooves (9), wherein the limiting blocks (6) slide in the adjacent limiting grooves (9).

2. A safe lithium battery pack for new energy vehicles according to claim 1, characterized in that: It also includes a plurality of separation components, the number of which is the same as the number of the accommodating cavities of the housing (1), the separation components are arranged in the adjacent accommodating cavities of the housing (1), and the separation components are used to actively push out the battery core (4) in the accommodating cavity of the housing (1), the separation components include a storage shell (10), a storage bag (11), an extrusion plate (12) and a blocking block (13), the storage shell (10) is fixedly connected to the adjacent accommodating cavity of the housing (1), and a flow hole is provided on the lower side of the storage shell (10). The storage bag (11) is fixedly connected to the lower side of the storage shell (10); the extrusion plate (12) is fixedly connected to the lower side of the storage bag (11) and is used to extrude the adjacent battery cells (4); the blocking block (13) is slidably connected to the extrusion plate (12); the blocking block (13) is used to block the flow hole on the storage shell (10); the storage bag (11) and the blocking block (13) are slidingly connected in a position-limiting and sealing manner; the storage bag (11) and the storage shell (10) are controllably connected through the blocking block (13).

3. A safe lithium battery pack for new energy vehicles according to claim 2, characterized in that: The internal space of the storage shell (10) is in the shape of a frustum.

4. The safe lithium battery pack for new energy vehicles according to claim 2, characterized in that: The separation assembly further comprises a plurality of cutting knives (14), wherein the cutting knives (14) are fixedly connected to one side of the extrusion plate (12), and the cutting knives (14) are used to cut off the electrode sheets on the adjacent battery cells (4) during movement.

5. The safe lithium battery pack for new energy vehicles according to claim 4, characterized in that: The separation assembly further includes a connecting rod (15), the connecting rod (15) being arranged on the adjacent bottom plate (3), the connecting rod (15) being slidably and rotatably connected to the blocking block (13), the blocking block (13) being provided with a limiting ring groove (151), the connecting rod (15) being slidably connected to a limiting ball (152) sliding in the limiting ring groove (151), and a spring being fixed between the limiting ball (152) and the connecting rod (15).

6. The safe lithium battery pack for new energy vehicles according to claim 5, characterized in that: The cross section of the limiting ring groove (151) is arc-shaped, the diameter of the circle where the cross section of the limiting ring groove (151) is located is equal to the diameter of the limiting ball (152), and the depth of the limiting ring groove (151) is smaller than the diameter of the limiting ball (152).

7. The safe lithium battery pack for new energy vehicles according to claim 5, characterized in that: It also includes a plurality of connecting columns (18), the number of the connecting columns (18) being consistent with the number of the base plates (3), the connecting columns (18) being provided with external threads, the connecting columns (18) being threadedly connected to the adjacent base plates (3) via the external threads thereon, the lower ends of the connecting rods (15) being provided with spline portions, the connecting columns (18) being provided with spline grooves for the adjacent connecting rods (15) to slide, and the base plates (3) being provided with spline grooves for the adjacent connecting rods (15) to slide.

8. The safe lithium battery pack for new energy vehicles according to claim 7, characterized in that: The projection of the spline groove on the bottom plate (3) on the horizontal plane does not overlap with the projection of the spline groove on the adjacent connecting column (18) on the horizontal plane.

9. The safe lithium battery pack for new energy vehicles according to claim 1, characterized in that: Fixed blocks (19) distributed in a matrix are fixedly connected in the accommodating cavity of the housing (1), and symmetrically distributed extrusion blocks (20) are fixedly connected to the bottom plate (3). The fixed blocks (19) are used to extrude adjacent extrusion blocks (20).

10. The safe lithium battery pack for new energy vehicles according to claim 9, characterized in that: The extrusion block (20) is made of a flexible material, and the extrusion block (20) is provided with a shuttle-shaped through hole.

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