A liquid-cooled lithium battery module with overheat protection function

Abstract

The present invention discloses a liquid-cooled lithium battery module with an overheating protection function, and relates to the technical field of battery cooling devices. It includes a mounting plate, the mounting plate is installed with a first fixed shell, the first fixed shell is detachably connected to a sealing cover, the first fixed shell is installed with a symmetrically distributed mounting shell, the interior of the mounting shell is installed with symmetrically and evenly distributed battery cells, the interior of the mounting shell is fixed with a symmetrically and evenly distributed liquid cooling plate, the interior of the first fixed shell is fixed with a liquid cooling pipe, the liquid cooling plate is fixed and connected with a connecting pipe, and the liquid cooling plate is fixed with a heat-conducting shell. The present invention separates the battery cell from the liquid cooling plate by a heat-conducting shell, so that when the battery cell expands and deforms, it squeezes the adjacent heat-conducting shell and increases the flow area of the adjacent connecting pipe, speeding up the flow rate of the coolant in the adjacent liquid cooling plate, thereby increasing the heat exchange efficiency with the adjacent heat-conducting shell, so that the battery cell after bulging can be quickly cooled down to avoid its continuous bulging.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cooling devices, and in particular to a liquid-cooled lithium battery module with an overheating protection function. Background Art

[0002] A lithium battery module (hereinafter referred to as a battery pack) is a battery pack composed of multiple single battery cells (hereinafter referred to as cells) connected in series and parallel, and equipped with the necessary management system (BMS). The battery pack generates heat during charging and discharging. If excessive heat accumulates, it may cause the internal temperature of the battery to rise sharply, resulting in thermal runaway, impairing battery performance, and even causing fire or explosion.

[0003] Therefore, when using the battery pack as a power battery for new energy vehicles, the battery pack needs to be cooled. Currently, heat conducting plates are usually placed around the battery cells, and coolant is introduced into the heat conducting plates. The coolant flowing in the heat conducting plates dissipates heat from the battery pack. Although this method can effectively dissipate the heat generated by the battery pack, if the battery pack expands due to improper use, the expanded battery pack will squeeze the heat conducting plates, causing the heat conducting plates to deform, resulting in the cooling path inside the heat conducting tube being squeezed and deformed, causing the flow rate of the coolant in the heat conducting plate at the deformed position to decrease, thereby reducing the heat dissipation efficiency of the liquid cooling tube to the battery pack, making it impossible to dissipate heat in time and affecting its normal use. Summary of the Invention

[0004] The present invention provides a liquid-cooled lithium battery module with an overheat protection function to solve the technical problems raised in the above background technology.

[0005] The technical solution of the present invention is: a liquid-cooled lithium battery module with overheating protection function, comprising a mounting plate, a first fixed shell is mounted on the upper side of the mounting plate, a sealing cover is detachably connected to the upper side of the first fixed shell, a symmetrically distributed mounting shell is mounted inside the first fixed shell, symmetrically and evenly distributed battery cells are mounted inside the mounting shell, a symmetrically and evenly distributed liquid cooling plate is fixed to the inside of the mounting shell, the liquid cooling plate is located on one side of an adjacent battery cell, a liquid cooling pipe is fixed to the inside of the first fixed shell, the liquid cooling pipe passes through the first fixed shell, the liquid cooling plate is fixedly connected to and communicated with a connecting pipe fixedly connected to and communicated with the liquid cooling pipe, the connecting pipe passes through the adjacent mounting shell, a drain pipe is fixedly connected to the inside of the first fixed shell, the liquid cooling plate is fixedly connected to and communicated with the drain pipe, and a heat-conducting shell is fixed to the side of the liquid cooling plate close to the adjacent battery cell.

[0006] Furthermore, the heat-conducting shell is made of an elastic and deformable material, and is used to fit tightly with adjacent battery cells. The interior of the heat-conducting shell is filled with hydraulic oil.

[0007] Furthermore, a sealing tube is provided inside the connecting tube, one end of the sealing tube is fixedly connected to a limiting ring, a slide groove is provided inside the connecting tube, the limiting ring slides in an adjacent slide groove, the mounting shell is fixedly connected to a symmetrically and evenly distributed connecting shell, the connecting shell is fixedly connected to and connected with a pipeline that passes through the mounting shell and is connected to the adjacent heat-conducting shell, the internal sealing sliding connection of the connecting shell is connected to a push plate, the push plate is fixedly connected to a rack on the side close to the adjacent connecting tube, the end of the sealing tube away from the adjacent limiting ring is fixedly connected to a gear meshing with the adjacent rack, the gear passes through the adjacent connecting tube and is rotatably connected thereto.

[0008] Furthermore, the sealing tube is made of an elastic and deformable material, and is used to change the flow area of the adjacent connecting tubes.

[0009] Furthermore, it also includes a symmetrical and evenly distributed second fixed shell, the second fixed shell is arranged inside the mounting shell, the outer side of the second fixed shell is slidably connected to a movable ring, the lower side of the second fixed shell is fixedly connected to a circumferentially evenly distributed fixed plate, the fixed plate and the conductive posts on adjacent battery cells are detachably connected, the fixed plate is provided with a limiting groove, the lower side of the movable ring is fixedly connected to an extrusion ring, the extrusion ring slides in the adjacent limiting groove, the interior of the second fixed shell is slidably connected to a movable plate, the movable plate is slidably connected to an extrusion block distributed evenly around the circumference, a spring is provided between the movable plate and the adjacent extrusion block, the extrusion block is extruded and matched with the conductive posts of the adjacent battery cells, the interior of the second fixed shell is fixedly connected to a circumferentially evenly distributed limiting block, the limiting block is provided with a symmetrically distributed guide groove, the extrusion block is provided with a through hole on a side close to the adjacent limiting block, the through hole of the extrusion block is slidably connected to symmetrically distributed connecting posts, and the connecting posts slide in the adjacent guide grooves.

[0010] Furthermore, an air storage cavity is provided inside the limit block, an extrusion plate is connected to the internal limit sliding of the guide groove, a first elastic member is provided between the symmetrically distributed connecting columns, and the extrusion plate is extruded and matched with the adjacent connecting columns.

[0011] Furthermore, a toothed groove is provided on one side of the second fixed shell, and a moving block is slidably connected to the side of the moving ring adjacent to the toothed groove. The moving block is provided with an inclined surface that is limitedly matched with the adjacent toothed groove, and a symmetrically distributed second elastic member is fixed between the moving block and the adjacent moving ring.

[0012] Furthermore, the teeth in the tooth-shaped groove are single-sided teeth, which are used to limit the moving block.

[0013] Furthermore, the mounting plate is inlaid with symmetrically distributed liquid storage tubes, the liquid storage tubes are slidably connected to movable columns, the interior of the liquid storage tubes is slidably connected to a movable disk, the movable disk is fixedly connected to the adjacent movable columns, the movable columns are fixedly connected to the first fixed shell, a third elastic member is fixedly connected between the movable columns and the adjacent liquid storage tubes, two groups of symmetrically distributed fixed columns are fixedly connected to the interior of the liquid storage tubes, and the movable disk is provided with through holes that cooperate with the adjacent fixed columns.

[0014] Furthermore, each group of the fixing columns is provided with a plurality of columns evenly distributed in the circumferential direction, the fixing columns are truncated cone-shaped, the diameters of the same side surfaces of the fixing columns in the same group are the same, and the lengths of the fixing columns in the same group are different.

[0015] The beneficial effect is: the present invention separates the battery core from the liquid cooling plate through the heat-conducting shell, so that when the battery core expands and deforms, it squeezes the adjacent heat-conducting shell, and increases the flow area of the adjacent connecting pipes, thereby accelerating the flow rate of the coolant in the adjacent liquid cooling plates, thereby increasing the heat exchange efficiency with the adjacent heat-conducting shell, so that the battery core that has bulged can be cooled quickly to avoid its continued bulging.

[0016] The conductive posts of the battery cell are held tightly by the fixing plates evenly distributed circumferentially, and the second fixing shell is then fixed, so that the connection of the conductive posts of the battery cell is faster and more convenient.

[0017] The gas in the gas storage chamber expands due to heat, causing the connecting column to lose contact with the adjacent limit block. At the same time, the extrusion block moves away from the center of the adjacent second fixed shell under the action of the adjacent spring, thereby disconnecting the adjacent conductive column, disconnecting the battery cell from the entire circuit, and preventing the battery cell from continuing to heat up.

[0018] The symmetrically distributed third elastic members cooperate with the movable plate to cushion the first fixed housing when the vehicle brakes suddenly, thereby preventing the battery pack inside the first fixed housing from being impacted by inertia when the vehicle brakes suddenly, thereby preventing the battery pack and other electrical components inside the first fixed housing from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the internal parts of the sealing cover of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the internal parts of the installation shell of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the liquid cooling plate and the heat-conducting shell of the present invention;

[0023] Figure 5 Schematic diagram of the three-dimensional structure of the sealing tube and the limiting ring of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the second fixed shell and the movable ring of the present invention;

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the internal parts of the second fixed shell and the internal parts of the movable ring of the present invention;

[0026] Figure 8 This is an exploded view of the three-dimensional structure of the fixing plate and the extrusion ring of the present invention;

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the air storage cavity and the extrusion plate of the present invention;

[0028] Figure 10 It is a schematic diagram of the three-dimensional structure of the internal parts of the liquid storage tube of the present invention.

[0029] In the accompanying drawings: 1. mounting plate, 2. first fixed shell, 3. sealing cover, 4. mounting shell, 5. liquid cooling plate, 6. liquid cooling pipe, 7. connecting pipe, 8. drain pipe, 9. heat conducting shell, 10. sealing pipe, 101. limiting ring, 11. connecting shell, 12. push plate, 13. rack, 14. gear, 15. second fixed shell, 16. moving ring, 17. fixed plate, 18. limiting groove, 19. extrusion ring, 20. moving plate, 21. extrusion block, 22. limiting block, 23. guide groove, 231. connecting column, 24. air storage chamber, 25. extrusion plate, 26. first elastic member, 27. toothed groove, 28. moving block, 281. second elastic member, 29. liquid storage pipe, 30. moving column, 31. moving disk, 32. third elastic member, 33. fixed column. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1: Considering that lithium battery packs are mostly cooled by air or liquid during use, when liquid cooling is used, heat conducting plates are usually installed at the bottom or both sides of the battery cell. The coolant flowing in the liquid cooling plate dissipates heat from the heat conducting plate, and then dissipates heat from the battery cell. However, when the battery cell bulges due to improper use, the colliding battery cell squeezes the adjacent heat conducting plate, causing the heat conducting plate to deform due to the squeezing force, and then changes the distance between the heat conducting plate and the liquid cooling plate. This causes a difference in the cooling effect of the liquid cooling plate on the heat insulation plate, and then a difference in the cooling effect of the battery cell. To address this problem, the present invention solves it through the following operations:

[0032] A liquid-cooled lithium battery module with overheat protection function, such as Figure 1-Figure 5As shown, it includes a mounting plate 1, which is connected to the bottom plate of the vehicle by threads, a first fixed shell 2 is installed on the upper side of the mounting plate 1, and a sealing cover 3 is detachably connected to the upper side of the first fixed shell 2, and two mounting shells 4 symmetrically distributed on the left and right are installed inside the first fixed shell 2, and two groups of battery cells symmetrically distributed on the left and right are installed inside the mounting shell 4, and each group of battery cells includes a plurality of cells distributed equidistantly, and two groups of liquid cooling plates 5 symmetrically distributed on the left and right are fixedly connected inside the mounting shell 4, and each group of liquid cooling plates 5 includes a plurality of cells distributed equidistantly, and the liquid cooling plates 5 are located on one side of adjacent battery cells, and the specific number of liquid cooling plates in each group is one more than the number of adjacent groups of battery cells, and two adjacent liquid cooling plates 5 are respectively located on both sides of adjacent battery cells, and a liquid cooling pipe 6 is fixedly connected inside the first fixed shell 2, and the liquid cooling pipe 6 is connected to the cooling box for cooling the vehicle, and the liquid cooling pipe 6 passes through the first fixed shell 2, and the liquid cooling plate 5 is fixedly connected and connected to The liquid cooling pipe 6 is fixedly connected and communicated with the connecting pipe 7, and the connecting pipe 7 connected with the same group of liquid cooling plates 5 is set as a group. The connecting pipe 7 passes through the adjacent mounting shell 4. The connecting pipes 7 symmetrically distributed on the same mounting shell 4 are respectively on its left and right sides. The cooling liquid is transported to the four groups of liquid cooling plates 5 by the cooling box through the liquid cooling pipe 6 and the four groups of connecting pipes 7, and the cooling liquid flowing in the liquid cooling plate 5 dissipates heat to the adjacent battery cells. A drainage pipe 8 is fixedly connected to the interior of the first fixed shell 2 in a penetrating manner. The liquid cooling plate 5 is fixedly connected and communicated with the drainage pipe 8. The drainage pipe 8 transports the cooling liquid after heat exchange back to the cooling box. A heat-conducting shell 9 is fixedly connected to the side of the liquid cooling plate 5 close to the adjacent battery cell. The heat-conducting shell 9 is made of an elastic deformable material. When the battery cell expands, the battery cell drives the adjacent heat-conducting shell 9 to deform synchronously to ensure that the heat-conducting shell 9 is always tightly fitted with the adjacent battery cell. The interior of the heat-conducting shell 9 is filled with hydraulic oil.

[0033] like Figure 4 and Figure 5As shown, a sealing tube 10 is provided inside the connecting tube 7, and one end of the sealing tube 10 close to the adjacent liquid cooling plate 5 is fixedly connected to a limiting ring 101, and a slide groove is provided inside the connecting tube 7. The limiting ring 101 slides in the adjacent slide groove to limit the adjacent limiting ring 101. The mounting shell 4 is fixed with two groups of connecting shells 11 distributed symmetrically on the left and right. Each group of connecting shells 11 includes a number of equidistantly distributed ones. The specific number of each group of limiting rings 101 is the same as the specific number of each group of liquid cooling plates 5. The lower side of the connecting shell 11 is fixedly connected and connected with a pipeline that passes through the mounting shell 4 and is connected to the adjacent heat-conducting shell 9, which is used to guide the hydraulic oil in the heat-conducting shell 9. The interior of the connecting shell 11 is sealed and slidably connected to a push plate 12, and the upper side of the push plate 12 is fixedly connected to The rack 13 is driven by the hydraulic oil delivered to the connecting shell 11 through the adjacent push plate 12 to move the adjacent rack 13. The end of the sealing tube 10 away from the adjacent limit ring 101 is fixed with a gear 14 meshing with the adjacent rack 13. The gear 14 passes through the adjacent connecting tube 7 and is rotatably connected thereto. The adjacent gear 14 is driven to rotate by the rack 13. The sealing tube 10 is made of an elastic deformable material and is used to change the flow area of the adjacent connecting tube 7. During the rotation of the gear 14, the flow area of the adjacent sealing tube 10 is changed, thereby changing the flow area of the adjacent connecting tube 7. In the initial state, the push plate 12 is located at the lowermost side of the adjacent connecting shell 11, and the flow area of the sealing tube 10 is the smallest state, and it is initially in a torsional storage state. Figure 5 The middle is the position of the push plate 12 after it moves.

[0034] In this embodiment, the directional words such as left and right are all represented by Figure 5 The perspective shall prevail.

[0035] When using this device, the mounting plate 1 is screwed onto the bottom plate of the car, and the battery pack is connected to the circuit. Subsequently, during the use of the battery pack, the heat generated by the battery cell is transferred to the adjacent heat-conducting shell 9, and then transferred from the adjacent heat-conducting shell 9 to the adjacent liquid cooling plate 5. The coolant flowing in the liquid cooling plate 5 takes away the heat generated during the operation of the battery cell, thereby dissipating the heat of the battery module.

[0036] During the use of this device, if the battery cell bulges due to improper use, the bulged battery cell squeezes the adjacent heat-conducting shell 9, causing the adjacent heat-conducting shell 9 to deform, and then the hydraulic oil in the adjacent heat-conducting shell 9 flows into the adjacent connecting shell 11 under the squeezing force, thereby driving the adjacent push plate 12 to move upward, and the push plate 12 drives the adjacent rack 13 to move upward, and the rack 13 drives the adjacent gear 14 to rotate during the upward movement, and the gear 14 drives the left end of the adjacent sealing tube 10 to rotate, so that the gathering part of the sealing tube 10 is loosened, and the sealing tube 10 is tightened. Due to the flow of coolant in the adjacent connecting tube 7 and its own elasticity, the right end of the deformed sealing tube 10 moves to the right, thereby driving the adjacent limiting ring 101 to move to the right along the slide groove on the adjacent connecting tube 7, so as to increase the flow area of the sealing tube 10, thereby increasing the speed of the coolant flowing from the liquid cooling tube 6 to the liquid cooling plate 5, thereby increasing the flow speed of the liquid in the liquid cooling plate 5, increasing the heat exchange speed with the adjacent heat-conducting shell 9, and thereby increasing the cooling speed of the battery cell after the bulge, thereby preventing the battery cell from continuing to expand due to excessive temperature, which may cause greater harm (fire).

[0037] When the user finds that the battery cell is bulging, the user should drive the vehicle to the designated location in time and replace the bulged battery. The replaced battery cell will no longer squeeze the adjacent heat-conducting shell 9, so that the heat-conducting shell 9 that has been squeezed and deformed will be restored to its initial state under the action of its own elastic force, and then the hydraulic oil delivered to the adjacent connecting shell 11 will be withdrawn, so that the adjacent push plate 12 will move downward, and the push plate 12 will drive the adjacent rack 13 to rotate, and the rack 13 will drive the left end of the adjacent sealing tube 10 to rotate synchronously. At the left end of the sealing tube 10, During the rotation process, the right end of the sealing tube 10 is limited by the adjacent limiting ring 101 and does not rotate synchronously with its left end, so that the right end of the sealing tube 10 drives the adjacent limiting ring 101 to move to the left along the slide groove on the adjacent connecting tube 7, so that the right end of the sealing tube 10 is accumulated to the left, and at the same time, the middle part of the sealing tube 10 is gathered to reduce the flow area of the middle part of the sealing tube 10, thereby reducing the flow area of the adjacent connecting tube 7, and reducing the volume of coolant transported by the liquid cooling tube 6 through the connecting tube 7 to the adjacent liquid cooling plate 5 per unit time.

[0038] Example 2: Considering that in the current production process of lithium batteries, workers usually assemble multiple battery cells and use threads and bolts to fix the conductive plates on the conductive posts of two battery cells. This can connect two adjacent battery cells, but the process is relatively cumbersome and requires a lot of time for workers. To solve this problem, the present invention solves it through the following operations:

[0039] On the basis of Example 1, Figure 4 and Figure 6-Figure 8As shown, it also includes four groups of second fixed shells 15 distributed symmetrically on the left and right, each group of second fixed shells 15 includes a plurality of equally distributed, each group of second fixed shells 15 is respectively arranged inside the adjacent mounting shell 4, and the lower side of the outer side of the second fixed shell 15 is slidably connected to the movable ring 16, each second fixed shell 15 is located on the conductive column of the adjacent battery cell, and the lower side of the second fixed shell 15 is fixed with a circumferentially uniformly distributed fixed plate 17, the fixed plate 17 is an elastically deformable material, and the fixed plate 17 is detachably connected to the conductive column on the adjacent battery cell, and the adjacent battery cells are fixed by the mutual cooperation of the circumferentially uniformly distributed fixed plates 17. The conductive pillars on the battery cell are tightly held so that the conductive pillars on the battery cell are fixed to the adjacent second fixed shell 15. The fixed plate 17 is provided with a limiting groove 18. The limiting groove 18 is inclined and evenly distributed circumferentially. The distance between the limiting grooves 18 gradually increases from bottom to top. The lower side of the movable ring 16 is fixed with an extrusion ring 19. The extrusion ring 19 slides in the adjacent limiting groove 18. The movable ring 16 drives the extrusion ring 19 to move upward synchronously along the limiting groove 18, thereby squeezing the adjacent fixed plate 17, so that the lower end of the fixed plate 17 swings toward the center of the adjacent second fixed shell 15. The second fixed shell 15 The interior of the second fixed shell 15 is slidably connected to a moving plate 20, and the upper end of the moving plate 20 is fixed with a connecting wire electrically connected to the circuit. The moving plate 20 is slidably connected to a group of extrusion blocks 21. A spring is provided between the moving plate 20 and the adjacent extrusion blocks 21. Each group of extrusion blocks 21 includes three evenly distributed circumferentially. The extrusion blocks 21 are squeezed and matched with the conductive columns of the adjacent battery cells. The moving plate 20 cooperates with the adjacent group of extrusion blocks 21 to connect the adjacent battery cells to the entire circuit. A group of limit blocks 22 is fixed to the interior of the second fixed shell 15. Each group of limit blocks 22 includes three evenly distributed circumferentially. Each limit block 2 2 are provided with symmetrically distributed guide grooves 23. The distance between the circumferentially uniform and symmetrically distributed guide grooves 23 gradually decreases from bottom to top. A through hole is provided on the side of the extrusion block 21 close to the adjacent limit block 22. The through hole of the extrusion block 21 is slidably connected with symmetrically distributed connecting columns 231. The connecting columns 231 slide in the adjacent guide grooves 23. The guide grooves 23 guide the adjacent connecting columns 231, and then guide the adjacent extrusion blocks 21. In the process of upward movement, the extrusion blocks 21 are guided by the adjacent guide grooves 23 and move toward the center of the adjacent second fixed shell 15.

[0040] like Figure 8 and Figure 9As shown, an air storage cavity 24 is provided inside the limit block 22. The distance between the air storage cavities 24, which are uniformly distributed circumferentially, gradually decreases from bottom to top. The air storage cavity 24 is filled with heat-sensitive gas. The internal limiting sliding connection of the guide groove 23 is connected to an extrusion plate 25. The heat-sensitive gas in the air storage cavity 24 expands due to the heat generated by the adjacent battery cells, thereby driving the adjacent extrusion plates 25 to move. A first elastic member 26 is provided between the symmetrically distributed connecting columns 231. The first elastic member 26 is a spring. The first elastic member 26 is used to maintain the initial position of the two adjacent connecting columns 231 and drive the two connecting columns 231 to return to the initial position after movement. The extrusion plate 25 is extruded and matched with the adjacent connecting columns 231. The extrusion plate 25 squeezes the adjacent connecting columns 231, causing the connecting columns 231 to lose fit with the adjacent guide groove 23. A rolling ball is connected to the end of the connecting column 231 close to the adjacent extrusion plate 25 to reduce the friction between the extrusion plate 25 and the adjacent connecting column 231 and between the connecting column 231 and the adjacent limit block 22.

[0041] like Figure 7 As shown, a toothed groove 27 is provided on one side of the second fixed shell 15, and a moving block 28 is slidably connected to the side of the moving ring 16 close to the adjacent toothed groove 27. The upper side of the moving block 28 is provided with an inclined surface that cooperates with the adjacent toothed groove 27 to limit the position. The teeth in the toothed groove 27 are single-sided teeth, and the inclined surface of the teeth faces the lower side, which is used to limit the moving block 28 and then fix the adjacent moving ring 16 to fix the adjacent second fixed shell 15 on the adjacent conductive column on the adjacent battery cell. A symmetrically distributed second elastic member 281 is fixed between the moving block 28 and the adjacent moving ring 16. The second elastic member 281 is a tension spring. The second elastic member 281 is used to maintain the initial position of the adjacent moving block 28 and drive the moving block 28 to reset to the initial position after movement.

[0042] In this embodiment, the upper and lower directional words are all Figure 7 The perspective shall prevail.

[0043] During the battery pack production process, after the staff fixes the position of the battery cells, they select a second fixing shell 15 of appropriate size based on the size of the conductive posts on the battery cells and install the selected second fixing shell 15 on the conductive posts. The installation process of one of the second fixing shells 15 is described as an example:

[0044] The staff will put the selected second fixed shell 15 on the conductive column and press it downward. At this time, the upper end of the conductive column limits the adjacent movable plate 20, so that the movable plate 20 moves upward relative to the adjacent second fixed shell 15, and the movable plate 20 drives the adjacent group of extrusion blocks 21 to move upward synchronously. In the process of the upward movement of the group of extrusion blocks 21, the adjacent group of connecting columns 231 are respectively guided by the adjacent guide grooves 23 to drive the group of extrusion blocks 21 to move synchronously toward the middle of the adjacent second fixed shell 15, and compress the adjacent group of springs to store force to change the distance between the lower side of the reorganized extrusion block 21 and the adjacent conductive column until the group of extrusion blocks 21 are tightly fitted with the adjacent conductive column. At this time, the conductive column limits the group of extrusion blocks 21, so that the group of extrusion blocks 21 cannot continue to move toward the middle of the adjacent second fixed shell 15, and at the same time limits the adjacent movable plate 20, so that the movable plate 20 cannot continue to move upward.

[0045] After the above-mentioned movable plate 20 no longer moves upward, the staff maintains the second fixed shell 15 in this position while pulling the adjacent movable ring 16 upward. The movable ring 16 drives the adjacent extrusion ring 19 to move upward synchronously. In the process of the extrusion ring 19 moving upward, the extrusion ring 19 moves upward synchronously along the limiting groove 18 of an adjacent group, so that the lower end of an adjacent group of fixed plates 17 swings around its upper end, and then the lower end of the fixed plate 17 approaches the adjacent conductive column until the group of fixed plates 17 is tightly fitted with the adjacent conductive column. At this time, the conductive column limits the group of fixed plates 17, so that the group of fixed plates 17 cannot move further. At the same time, the group of fixed plates 17 limits the adjacent movable ring 16, so that the movable ring 16 can also not move further upward.

[0046] During the upward movement of the moving ring 16, the moving ring 16 drives the adjacent moving block 28 to move upward. During the upward movement of the moving block 28, the inclined surface of the moving block 28 contacts the inclined surface on the lower side of the inner teeth of the adjacent tooth-shaped groove 27, and is squeezed by the inner teeth of the adjacent tooth-shaped groove 27 and moves to the right. During the rightward movement, the moving block 28 stretches the two adjacent second elastic members 281 until the moving block 28 moves upward to the position where its lower side contacts the upper side of the inner teeth of the adjacent tooth-shaped groove 27. The moving block 28 moves to the left under the joint action of the two adjacent second elastic members 281 until the two second elastic members 281 are reset to the initial state, and the adjacent moving blocks 28 synchronously move to the left to the limit position. At this time, the moving block 28 is in the middle of two adjacent teeth in the adjacent tooth-shaped groove 27. At the same time, the moving block 28 is limited by the lower teeth of the two adjacent teeth and cannot move downward, thereby limiting the vertical position of the moving ring 16. Until the moving ring 16 can no longer move upward, the moving block 28 cooperates with the adjacent teeth to fix the moving ring 16, thereby fixing the second fixed shell 15, making the fixation of the second fixed shell 15 faster, even if the conductive column and the extrusion block 21 are fixed faster, the rest of the fixing process of the second fixed shell 15 can refer to the above. After the second fixed shell 15 is installed on the conductive column of the adjacent battery cell, the staff connects the connecting wires on the moving plate 20 to the circuit.

[0047] After the above-mentioned battery cell is bulged, after the above-mentioned cooling, when the heat generated continues to increase, the heat generated by the battery cell is transferred to the adjacent conductive column, and the conductive column transfers the heat to the adjacent group of extrusion blocks 21, and the group of extrusion blocks 21 transfers the heat to the adjacent group of limit blocks 22, so that the gas in the adjacent group of gas storage chambers 24 expands due to the heat, thereby driving the adjacent three groups of extrusion plates 25 to slide along the adjacent guide grooves 23 respectively. In the process of the movement of the three groups of extrusion plates 25, the three groups of extrusion plates 25 respectively squeeze the adjacent connecting columns 231, so that the connecting columns 231 move into the through holes on the upper sides of the adjacent extrusion blocks 21, and at the same time the adjacent first elastic members 26 are compressed and stored until the heat generated by the battery cell reaches a certain level. The plate 25 moves to the extreme position, and the adjacent connecting column 231 moves completely into the through hole on the upper side of the adjacent extrusion block 21. At this time, the connecting column 231 loses contact with the adjacent limit block 22. At the same time, the group of extrusion blocks 21 is no longer limited by the adjacent connecting column 231 and the adjacent limit block 22. At this time, the group of extrusion blocks 21 moves synchronously in the direction away from the center of the adjacent second fixed shell 15 under the action of the adjacent springs to disconnect the adjacent conductive column, so that the battery cell is disconnected from the entire circuit, avoiding the continuous increase in heat of the battery cell, causing the battery pack to catch fire, reducing the capacity of the battery pack, and shortening the vehicle's drivable distance. At this time, the owner can be informed that a battery cell in the battery is overheating, which subsequently affects the vehicle being moved to a repair shop for inspection.

[0048] Embodiment 3: Considering that the battery pack is usually installed on the bottom of the vehicle during installation, when the vehicle brakes while driving, the battery pack is easily impacted by inertia and easily collides with the mounting frame, causing damage to the electrical components inside the battery pack. To address this problem, the present invention solves it through the following operations:

[0049] On the basis of Example 2, Figure 2 and Figure 10 As shown, the mounting plate 1 is inlaid with two liquid storage tubes 29 distributed symmetrically on the left and right. The interior of the liquid storage tubes 29 is filled with hydraulic oil. The liquid storage tubes 29 are slidably connected to the moving columns 30. The interior of the liquid storage tubes 29 is slidably connected to the moving disk 31. The moving disk 31 is fixedly connected to the adjacent moving columns 30. The moving columns 30 are fixedly connected to the first fixed shell 2. The first fixed shell 2 drives the two moving disks 31 to move synchronously through the transmission of the two moving columns 30. A third elastic member 32 is fixedly connected between the moving column 30 and the adjacent liquid storage tubes 29. The third elastic member 32 is a tension spring. The third elastic member 32 is used to maintain the initial position of the adjacent moving columns 30. Position, while reducing the moving speed of the first fixed shell 2, two groups of fixed columns 33 symmetrically distributed front and back are fixed to the interior of the liquid storage tube 29, and each group of fixed columns 33 is set to a plurality of fixed columns 33 evenly distributed circumferentially, and the fixed columns 33 are frustum-shaped. The diameters of the same side surfaces of the same group of fixed columns 33 are the same, and the lengths of the fixed columns 33 in the same group are different. The moving disk 31 is provided with through holes that cooperate with adjacent fixed columns 33. During the movement of the moving disk 31, the through holes on the adjacent moving disk 31 are gradually blocked by the fixed columns 33 to reduce the flow area of the through holes on the moving disk 31, thereby reducing the moving speed of the first fixed shell 2 again.

[0050] When the vehicle brakes, the first fixed housing 2 moves forward under the influence of the battery pack therein. During the movement, the first fixed housing 2 drives the two movable columns 30 to move synchronously. The following describes the movement process of the right movable column 30 as an example:

[0051] During the movement, the moving column 30 drives the adjacent moving disk 31 to move synchronously. During the movement of the moving disk 31, the hydraulic oil in the liquid storage tube 29 flows through the through-holes on the adjacent moving disk 31 until the moving disk 31 moves forward to a position where it cooperates with the longest fixed column 33 in the front adjacent group of fixed columns 33. When the moving disk 31 continues to move forward, the rear end of the longest fixed column 33 in the front group of fixed columns 33 extends into the adjacent through-hole on the adjacent moving disk 31, blocking the through-hole, reducing the flow area of the through-hole, and thereby slowing down the moving speed of the moving disk 31.

[0052] When the movable plate 31 moves to a position where it mates with another fixed post 33 in an adjacent group of fixed posts 33, the movement of the movable plate 31 is slowed down again (refer to the above for the specific process), thereby reducing the forward movement speed of the first fixed housing 2, i.e., the battery pack therein. This prevents the battery pack inside the first fixed housing 2 from being impacted by inertia when the vehicle brakes suddenly, thereby preventing damage to the battery pack and other electrical components inside the first fixed housing 2.

[0053] In the process of the first fixed shell 2 driving the two movable columns 30 to move forward, the movable columns 30 move forward so that the adjacent third elastic members 32 are stretched and force is stored, thereby preliminarily buffering the movement of the first fixed shell 2. At the same time, when the first fixed shell 2 stops moving forward under the buffering of the two third elastic members 32 and the two groups of fixed columns 33, the tension exerted on the two third elastic members 32 no longer changes. At the same time, the two third elastic members 32 jointly drive the first fixed shell 2 and other parts therein to synchronously reset to the initial position so as to be ready for continued use next time.

[0054] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application based on the technical solution and its improved ideas, which should be covered by the scope of protection of the present application.

Claims

1. A liquid-cooled lithium battery module with an overheat protection function, comprising a mounting plate (1), a first fixing shell (2) mounted on the upper side of the mounting plate (1), a sealing cover (3) detachably connected to the upper side of the first fixing shell (2), symmetrically distributed mounting shells (4) mounted inside the first fixing shell (2), and symmetrically and evenly distributed battery cells mounted inside the mounting shells (4), characterized in that: It also includes a symmetrical and evenly distributed liquid cooling plate (5), the liquid cooling plate (5) is fixed to the inside of the adjacent mounting shell (4), the liquid cooling plate (5) is located on one side of the adjacent battery cell, a liquid cooling pipe (6) is fixed to the inside of the first fixed shell (2), the liquid cooling pipe (6) passes through the first fixed shell (2), the liquid cooling plate (5) is fixed to and communicated with a connecting pipe (7) fixed to and communicated with the liquid cooling pipe (6), the connecting pipe (7) passes through the adjacent mounting shell (4), a drain pipe (8) is fixed to the inside of the first fixed shell (2), the liquid cooling plate (5) is fixed to and communicated with the drain pipe (8), and a heat conducting shell (9) is fixed to the side of the liquid cooling plate (5) close to the adjacent battery cell; The heat-conducting shell (9) is made of an elastic and deformable material and is used to fit tightly with adjacent battery cells. The interior of the heat-conducting shell (9) is filled with hydraulic oil. A sealing tube (10) is provided inside the connecting tube (7), one end of the sealing tube (10) is fixedly connected to a limiting ring (101), a slide groove is provided inside the connecting tube (7), the limiting ring (101) slides in the adjacent slide groove, the mounting shell (4) is fixedly connected to a symmetrical and evenly distributed connecting shell (11), the connecting shell (11) is fixedly connected to and connected with a pipeline that passes through the mounting shell (4) and is connected to the adjacent heat-conducting shell (9), the interior of the connecting shell (11) is sealingly and slidingly connected to a push plate (12), the push plate (12) is fixedly connected to a rack (13) on one side close to the adjacent connecting tube (7), the end of the sealing tube (10) away from the adjacent limiting ring (101) is fixedly connected to a gear (14) meshing with the adjacent rack (13), the gear (14) passes through the adjacent connecting tube (7) and is rotatably connected thereto; The sealing tube (10) is made of an elastic and deformable material and is used to change the flow area of the adjacent connecting tube (7).

2. The liquid-cooled lithium battery module with overheat protection function according to claim 1, characterized in that: The battery pack further comprises a symmetrical and evenly distributed second fixed shell (15), wherein the second fixed shell (15) is arranged inside the mounting shell (4), and a movable ring (16) is slidably connected to the outer side of the second fixed shell (15), and a circumferentially evenly distributed fixed plate (17) is fixedly connected to the lower side of the second fixed shell (15), and the fixed plate (17) is detachably connected to the conductive column on the adjacent battery cell, and the fixed plate (17) is provided with a limiting groove (18), and an extrusion ring (19) is fixedly connected to the lower side of the movable ring (16), and the extrusion ring (19) slides in the adjacent limiting groove (18), and the interior of the second fixed shell (15) is slidably connected to the movable plate (20). The movable plate (20) is slidably connected to an extrusion block (21) that is evenly distributed in the circumferential direction, a spring is provided between the movable plate (20) and the adjacent extrusion block (21), and the extrusion block (21) is extruded and matched with the conductive column of the adjacent battery cell, and the interior of the second fixed shell (15) is fixed with a limit block (22) that is evenly distributed in the circumferential direction, and the limit block (22) is provided with a symmetrically distributed guide groove (23), and a through hole is provided on a side of the extrusion block (21) close to the adjacent limit block (22), and a symmetrically distributed connecting column (231) is slidably connected in the through hole of the extrusion block (21), and the connecting column (231) slides in the adjacent guide groove (23).

3. The liquid-cooled lithium battery module with overheat protection function according to claim 2, characterized in that: An air storage cavity (24) is provided inside the limiting block (22), an extrusion plate (25) is slidably connected to the inside of the guide groove (23), a first elastic member (26) is provided between the symmetrically distributed connecting columns (231), and the extrusion plate (25) is extruded and fitted with adjacent connecting columns (231).

4. The liquid-cooled lithium battery module with overheat protection function according to claim 2, characterized in that: A toothed groove (27) is provided on one side of the second fixed shell (15); a moving block (28) is slidably connected to a side of the moving ring (16) adjacent to the toothed groove (27); the moving block (28) is provided with an inclined surface that is limitedly engaged with the adjacent toothed groove (27); and a symmetrically distributed second elastic member (281) is fixedly connected between the moving block (28) and the adjacent moving ring (16).

5. The liquid-cooled lithium battery module with overheat protection function according to claim 4, characterized in that: The teeth in the tooth-shaped groove (27) are single-sided teeth and are used to limit the moving block (28).

6. The liquid-cooled lithium battery module with overheat protection function according to claim 1, characterized in that: The mounting plate (1) is inlaid with symmetrically distributed liquid storage tubes (29), the liquid storage tubes (29) are slidably connected to movable columns (30), the interior of the liquid storage tubes (29) is slidably connected to a movable disk (31), the movable disk (31) is fixedly connected to the adjacent movable columns (30), the movable columns (30) are fixedly connected to the first fixed shell (2), a third elastic member (32) is fixedly connected between the movable columns (30) and the adjacent liquid storage tubes (29), two groups of symmetrically distributed fixed columns (33) are fixedly connected to the interior of the liquid storage tubes (29), and the movable disk (31) is provided with a through hole that cooperates with the adjacent fixed columns (33).

7. The liquid-cooled lithium battery module with overheat protection function according to claim 6, characterized in that: Each group of the fixing columns (33) is provided with a plurality of columns evenly distributed in the circumferential direction. The fixing columns (33) are truncated cone-shaped. The diameters of the same side surfaces of the fixing columns (33) in the same group are the same, and the lengths of the fixing columns (33) in the same group are different.

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