Mica Plate Installation Structure of Power Battery

Abstract

The present invention discloses a mica plate installation structure for a power battery, which relates to the technical field of mica plate installation structures and includes a battery case. The battery case includes a top shell plate, and a battery cell is installed inside the battery case. The structure further includes: two installation components, which are installed on the inner wall of the battery case between the top shell plate and the battery cell, and the two installation components are symmetrically arranged about the vertical central axis of the battery case; a mica plate, which is installed between the two installation components; and a torsion component installed in the installation component. Through the cooperation of the structures, when a thermal runaway occurs in the battery cell of the power battery, when the acting force generated by the impact of high-pressure gas on the mica plate exceeds a preset value, the torsion component controls the mica plate to bend towards the direction close to the battery cell, making the mica plate slightly bend into an arc shape, so that it can disperse the impact force received by its plane, thereby improving its compressive strength.

Description

Technical Field

[0001] The present invention relates to the technical field of mica plate installation structures, specifically to the mica plate installation structure of a power battery. Background Art

[0002] The mica plate is installed between the upper shell of the power battery and the battery cell module, and is an important component to prevent thermal runaway inside the battery pack, which can play a role in heat insulation and prevent series short circuits between batteries.

[0003] Currently, the mica plate of the power battery is usually installed inside the battery case by means of screws and fixing parts. For example, Chinese Patent Publication No. CN112670653B discloses an installation structure of a mica plate and a battery pack. This mica plate installation structure can utilize the hollow hole structure of the existing end plate to install and fix the mica plate. The insertion part can be inserted into or pulled out of the hollow hole, so as to realize the disassembly and assembly of the bracket, which has the advantages of simple and convenient disassembly and installation and high efficiency.

[0004] However, the above mica plate installation structure still has the following problems. When a thermal runaway occurs in the battery cell inside the battery case, high-pressure gas will be generated and flames will be ejected at the center of the top of the battery cell. Due to the relatively fixed installation method of the mica plate in the above structure and the limitation of the mica plate's own material, when the high-pressure gas impacts the mica plate, the mica plate may be directly penetrated, resulting in the flame directly passing through the mica plate and burning the battery shell. Summary of the Invention

[0005] The purpose of the present invention is to provide a mica plate installation structure for a power battery to solve at least one technical problem existing in the above prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A mica plate installation structure for a power battery, including a battery case, the battery case includes a top shell plate, and a battery cell is installed inside the battery case. It further includes:

[0007] Two sets of installation components are installed on the inner wall of the battery case between the top shell plate and the battery cell, and the two sets of installation components are symmetrically arranged about the vertical central axis of the battery case;

[0008] A mica plate is installed between the two installation components;

[0009] A torsion component installed in the installation component. When the high-pressure gas or flame ejected when the battery cell has a thermal runaway acts on the mica plate with a force exceeding a preset value, the torsion component causes the mica plate to bend towards the direction close to the battery cell.

[0010] Preferably, the installation component includes two fixing blocks, and the two fixing blocks are respectively fixed on the inner walls on the same side and opposite sides of the battery case. A circular groove is formed on the outer wall of the fixing block, and a circular block is rotatably installed in the circular groove. A sliding groove is formed on the outer wall of the circular block along the diameter direction, and a sliding block is slidably installed in the sliding groove. The outer walls of the two sliding blocks on the same side are jointly fixed with a U-shaped strip. The U-shaped strip includes an inner groove, and the opening direction of the inner groove faces the center position of the battery cell. A fixing structure for fixing the mica plate is installed on the inner wall of the inner groove.

[0011] Preferably, the torsion component includes a torsion spring installed between the circular block and the circular groove of the fixing block;

[0012] It further includes a limit card slot formed on the outer wall of the fixing block. The width of the limit card slot is the same as the width of the sliding block. Through holes for inserting shear nails are formed on the outer walls of both the fixing block and the sliding block.

[0013] Preferably, the fixing structure includes a plurality of connecting rods rotatably installed at the top inside the inner groove, and a groove for the connecting rods to extend into is formed at the top inside the inner groove. The bottom ends of the plurality of connecting rods are jointly rotatably installed with a pressing plate, and a protruding strip is provided at the bottom of one side of the pressing plate;

[0014] It further includes a jack formed inside the U-shaped strip, and the rotation point of the jack and the connecting rod is on the same horizontal plane. A through hole is formed inside each connecting rod, and the through hole penetrates through the rotation point of the connecting rod on the inner groove. When the pressing plate presses and fixes the mica plate, the jack is communicated with the through hole;

[0015] It further includes a plug rod that can be inserted into the jack and the through hole.

[0016] Preferably, the fixing structure includes a threaded hole formed on the U-shaped strip, and a locking screw for pressing and fixing the mica plate is threadedly connected in the threaded hole.

[0017] Preferably, the connecting rod is set as an elastic telescopic rod.

[0018] Preferably, an extension part is fixed on the outer wall of the pressing plate above the mica plate, and the extension part is in contact with and abuts against the top outer wall of the mica plate.

[0019] Preferably, when the sliding block slides into the sliding groove, the height of the mica plate is higher than the height of the center of the circular block.

[0020] Preferably, a central hole is formed on the outer wall of the sliding block, a hollow tube is fixed at the center of the circular block, and the hollow tube is rotatably installed in the circular groove of the fixing block through the hollow tube. The hollow tube is communicated with the outside. When the sliding block moves down to the limit card slot, the hollow tube and the central hole are staggered from each other.

[0021] Preferably, anti-slip patterns are provided on both the inner bottom of the inner groove and the outer wall of the pressing plate.

[0022] Preferably, the length of the extension part is less than the distance from the pressing plate to the center of the mica plate.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] Through the cooperation of the structures of the present invention, when thermal runaway occurs in the battery cell of the power battery, high-pressure gas will be generated at the top in the middle of the battery cell and flames will be ejected, impacting the mica plate. When the force generated by the impact exceeds the preset value, the torsion assembly controls the mica plate to bend towards the battery cell, making the mica plate slightly bend into an arc shape, so that it can disperse the impact force received on its plane, thereby improving its compressive strength. Furthermore, it can prevent the flame ejected from the battery cell from directly penetrating the mica plate and burning the top shell plate, further prolonging the time of the power battery catching fire, providing more escape time or rescue time for the passengers in the electric vehicle, and improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of the battery case of the present invention with one side inner wall removed;

[0026] Figure 2 is of the present invention Figure 1 front view;

[0027] Figure 3 is of the present invention Figure 2 sectional view taken along A-A in the present invention;

[0028] Figure 4 is of the present invention Figure 3 sectional view taken along B-B in the present invention;

[0029] Figure 5 is of the present invention Figure 4 sectional view taken along C-C in the present invention;

[0030] Figure 6 is of the present invention Figure 5 perspective view of the sectional view;

[0031] Figure 7 is a perspective view of the battery case of the present invention with the top shell plate removed;

[0032] Figure 8 is a state diagram of the present invention when the sliding block completely slides back into the sliding groove;

[0033] Figure 9 is of the present invention Figure 8 sectional view taken along D-D in the present invention;

[0034] Figure 10Schematic diagram of the second embodiment of the fixing structure of the present invention.

[0035] In the figure: 1, battery case; 2, top shell plate; 3, battery cell; 4, fixing block; 5, round block; 6, sliding groove; 7, sliding block; 8, shear pin; 9, C-shaped strip; 10, connecting rod; 11, pressing plate; 12, torsion spring; 13, hollow tube; 14, central hole; 15, limit card slot; 16, protruding strip; 17, jack; 18, inner groove; 19, extension part; 20, mica plate; 21, through hole; 22, inserting rod; 23, locking screw. Specific embodiments

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0037] Embodiment 1;

[0038] Please refer to Figures 1 to 9 , the present invention provides a technical solution: a mica plate mounting structure for a power battery, including a battery case 1, the battery case 1 includes a top shell plate 2, and a battery cell 3 is installed in the battery case 1. It further includes:

[0039] Two sets of mounting components are installed on the inner wall of the battery case 1 between the top shell plate 2 and the battery cell 3, and the two sets of mounting components are symmetrically arranged about the vertical central axis of the battery case 1;

[0040] A mica plate 20 is installed between the two mounting components;

[0041] A torsion component installed in the mounting component. When the battery cell 3 has a thermal runaway and the force of the high-pressure gas or flame ejected on the mica plate 20 exceeds a preset value, the torsion component causes the mica plate 20 to bend towards the direction close to the battery cell 3.

[0042] When the mica plate mounting structure of the power battery is in use, the mica plate 20 is installed between the two mounting components so that it is located between the top shell plate 2 and the battery cell 3;

[0043] Then when the battery cell 3 of the power battery has a thermal runaway, at this time, high-pressure gas will be generated at the top in the middle of the battery cell 3 and flames will be ejected, impacting the mica plate 20. When the force generated by the impact exceeds the preset value, the torsion component controls the mica plate 20 to bend towards the direction close to the battery cell 3. For reference, see Figure 8, slightly bend the mica plate 20 into an arc shape, so that it can disperse the impact force received by its plane, thereby improving its compressive strength, and further avoiding the flame ejected from the battery cell 3 directly penetrating the mica plate 20 and then burning to the top shell plate 2, further prolonging the fire time of the power battery, providing more escape time or rescue time for the passengers in the electric vehicle, and improving the safety performance.

[0044] In one relatively preferred embodiment, the installation assembly includes two fixing blocks 4, and the two fixing blocks 4 are respectively fixed on the inner walls of the same side and opposite sides of the battery case 1. A circular groove is formed on the outer wall of the fixing block 4, and a circular block 5 is rotatably installed in the circular groove. A sliding groove 6 is formed on the outer wall of the circular block 5 along the diameter direction, and a sliding block 7 is slidably installed in the sliding groove 6. The outer walls of the two sliding blocks 7 on the same side are jointly fixed with a C-shaped strip 9. The C-shaped strip 9 includes an inner groove 18, and the opening direction of the inner groove 18 faces the center position of the battery cell 3. A fixing structure for fixing the mica plate 20 is installed on the inner wall of the inner groove 18.

[0045] During installation, insert the mica plate 20 into the opposite inner grooves 18 of the two C-shaped strips 9, and then use the fixing structure on the inner wall of the inner groove 18 to fix the mica plate 20, thereby completing the installation of the mica plate 20.

[0046] In one relatively preferred embodiment, the torsion assembly includes a torsion spring 12 installed between the circular block 5 and the circular groove of the fixing block 4;

[0047] It further includes a limit card slot 15 formed on the outer wall of the fixing block 4. The width of the limit card slot 15 is the same as the width of the sliding block 7. Through holes for inserting the shear pin 8 are formed on the outer walls of the fixing block 4 and the sliding block 7.

[0048] Specifically, refer to Figure 4 and Figure 5 , before installing the mica plate 20, first rotate the sliding block 7 to drive the circular block 5 to rotate. At the same time, the torsion spring 12 is twisted and starts to accumulate elastic potential energy. When the sliding block 7 rotates to the vertical state, slide the sliding block 7 downward to adjust it so that it is inserted into the limit card slot 15 on the fixing block 4, and then insert the shear pin 8 into the through hole to play a fixing role on the sliding block 7. And due to the torsional force exerted by the torsion spring 12 on the circular block 5, the sliding groove 6 on the circular block 5 will exert a shearing force on the sliding block 7, and exert a fixing effect on the sliding block 7 again;

[0049] Then when the battery cell 3 has a thermal runaway, the high-pressure gas and flame ejected upward in the middle will push the mica plate 20 upward. When the force received by the mica plate 20 exceeds the preset value, the mica plate 20 will drive the sliding block 7 to move upward and cut the shear pin, and overcome the shearing effect of the sliding groove 6 on the sliding block 7, so that the sliding block 7 completely moves back into the sliding groove 6, that isFigure 8 In this state, the circular block 5 can rotate under the torsional force of the torsion spring 12, exerting a downward bending force on the mica plate 20, causing the mica plate 20 to bend into Figure 8 the state shown by the dashed line in the figure, changing from a flat plane to an arc shape with a curvature, so that it can disperse the impact force received by its plane, thereby improving its compressive strength, in order to achieve the above-mentioned effect of slowing down the time when the mica plate 20 is penetrated and providing passengers with a longer rescue time.

[0050] It is worth mentioning that during actual use, the magnitude of the torsional force of the torsion spring 12 can be set so that the torsional force of the torsion spring 12 will not break the mica plate 20.

[0051] In one relatively preferred embodiment, the fixing structure includes a plurality of connecting rods 10 rotatably mounted on the inner top of the inner groove 18, and a groove for the connecting rods 10 to extend into is opened on the inner top of the inner groove 18. The bottom ends of the plurality of connecting rods 10 are jointly rotatably mounted with a pressing plate 11, and a protruding strip 16 is provided at the bottom of one side of the pressing plate 11;

[0052] It also includes a jack 17 opened inside the U-shaped strip 9, and the rotation point of the jack 17 and the connecting rod 10 is on the same horizontal plane. A through hole 21 is opened in each connecting rod 10, and the through hole 21 penetrates the rotation point of the connecting rod 10 on the inner groove 18. When the pressing plate 11 presses and fixes the mica plate 20, the jack 17 is communicated with the through hole 21;

[0053] It further includes a plug rod 22 that can be inserted into the jack 17 and the through hole 21.

[0054] Specifically, refer to Figure 9 . As can be seen from the above, after inserting the mica plate 20 into the inner groove 18 on the U-shaped strip 9, it is horizontally moved until it contacts the protruding strip 16, and then it moves by pushing against the protruding strip 16, thereby driving the pressing plate 11 to move horizontally. When the pressing plate 11 moves horizontally, it will drive the connecting rod 10 to rotate, so that the pressing plate 11 moves downward while moving horizontally, pressing and fixing the mica plate 20;

[0055] Then when the connecting rod 10 rotates to the vertical state, at this time the extrusion effect of the pressing plate 11 on the mica plate 20 is the best, and at the same time the through hole 21 at the rotation point of the connecting rod 10 is also communicated with the jack 17. At this time, the plug rod 22 is inserted into the jack 17 and then passes through the through hole 21 in the connecting rod 10 in sequence to limit the rotation of the connecting rod 10, so as to achieve the effect of pressing and fixing the mica plate 20;

[0056] Then when disassembly is required, only the plug rod 22 needs to be pulled out, and then the mica plate 20 is directly pulled outwards. This not only facilitates the fixing of the mica plate 20, but also facilitates its disassembly and replacement;

[0057] It is worth mentioning that a torsion spring can also be installed at the rotation point of the connecting rod 10 to apply an upward rotational force to the connecting rod 10, so that the pressing plate 11 can be kept in a lifted state in the initial state, and there is sufficient space between the pressing plate 11 and the inner bottom of the inner groove 18 for the mica plate 20 to be inserted.

[0058] Embodiment 2 is basically the same as Embodiment 1, except that a second implementation manner of the fixing structure is provided. For details, please refer to Figure 10 ;

[0059] The fixing structure includes a threaded hole formed in the U-shaped strip 9, and a locking screw 23 for pressing and fixing the mica plate 20 is threadedly connected in the threaded hole.

[0060] When the mica plate 20 is inserted into the inner groove 18 on the U-shaped strip 9, the mica plate 20 can be directly pressed and locked by the locking screw 23. Moreover, a hole adapted to the locking screw 23 can also be formed in the mica plate 20, and the locking screw 23 can be fixed with a nut after passing through the hole.

[0061] In one relatively preferred embodiment, the connecting rod 10 is provided as an elastic telescopic rod.

[0062] The connecting rod 10 being an elastic telescopic rod enables the pressing plate 11 to adapt to mica plates 20 of different thicknesses, and the length of the connecting rod 10 after rotating to the vertical state can be automatically adjusted as the thickness changes.

[0063] In one relatively preferred embodiment, an extension part 19 is fixed to the outer wall of the pressing plate 11 above the mica plate 20, and the extension part 19 abuts against the top outer wall of the mica plate 20.

[0064] As can be seen from the above, when the round block 5 rotates under the action of the torsion force of the torsion spring 12 and exerts a downward bending force on the mica plate 20, the extension part 19 can be provided to increase the acting area on the mica plate 20 to prevent the mica plate 20 from breaking at the pressing plate 11, and the mica plate 20 can be more evenly stressed through the action of the extension part 19.

[0065] The extension part 19 can be an extension rod or an extension plate, preferably an extension plate, so as to increase the force-bearing area between it and the mica plate 20, thereby further preventing the mica plate 20 from breaking.

[0066] In one relatively preferred embodiment, when the sliding block 7 slides into the sliding groove 6, the height of the mica plate 20 is higher than the height of the center of the round block 5.

[0067] For details, please refer to Figure 8 , Figure 8Here, h indicates the distance between the mica plate 20 and the center of the circular block 5. Since the mica plate 20 is fixed to the C-shaped strip 9 through the pressing plate 11, when the mica plate 20 is bent into an arc shape, the position between the pressing plate 11 and the mica plate 20 will change, that is, the mica plate 20 will move outward. By setting the distance indicated by h, when the circular block 5 rotates, the distance between the two C-shaped strips 9 will first gradually decrease. During this process, when the mica plate 20 becomes arc-shaped, its position change with the pressing plate 11 can be avoided, thus ensuring the installation stability of the mica plate 20.

[0068] Meanwhile, during the process of the distance between the two C-shaped strips 9 gradually decreasing, it can also cooperate with the rotation trend of the circular block 5, thus playing an auxiliary role in bending the mica plate 20. Because the mica plate 20 also needs to overcome the impact of high-pressure gas and flame when bending downward, this auxiliary role can also ensure the success of bending the mica plate 20.

[0069] In one relatively preferred embodiment, a central hole 14 is provided on the outer wall of the sliding block 7, and a hollow tube 13 is fixed at the center of the circular block 5 and is rotatably installed in the circular groove of the fixed block 4 through the hollow tube 13. The hollow tube 13 is communicated with the outside. When the sliding block 7 moves down to the limit card slot 15, the hollow tube 13 and the central hole 14 are staggered from each other.

[0070] Specifically, refer to Figure 5 and Figure 8 , in the normal installation state of the mica plate 20, the hollow tube 13 and the central hole 14 are staggered from each other, so that the outside can be separated from the inside of the battery case 1 to ensure the internal sealing performance. Then when thermal runaway occurs and there is high-pressure gas inside the battery case 1, when the sliding block 7 slides back into the circular block 5, the hollow tube 13 and the central hole 14 are communicated, which helps to discharge the high-pressure gas inside, playing a certain pressure relief role and further delaying the explosion of the battery case 1. Moreover, the discharge of the high-pressure gas can relatively reduce the internal air pressure, thereby reducing the impact on the mica plate 20 and further reducing the probability of the mica plate 20 being penetrated, improving the safety performance.

[0071] In one relatively preferred embodiment, anti-slip patterns are provided on the inner bottom of the inner groove 18 and the outer wall of the pressing plate 11, and the installation stability between the two and the mica plate 20 can be increased through the anti-slip patterns.

[0072] In one relatively preferred embodiment, the length of the extension part 19 is less than the distance from the pressing plate 11 to the center of the mica plate 20.

[0073] By setting the length of the extension part 19, it can be avoided that it gets stuck when driving the mica plate 20 to bend subsequently.

[0074] The standard parts used in this embodiment can be directly purchased from the market. For the non-standard structural components described in the specification and drawings, they can also be directly processed without doubt according to the existing common technical knowledge. At the same time, the connection methods of each component adopt the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt the conventional models in the existing technology. Therefore, no specific description will be made here.

[0075] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Mica plate installation structure for a power battery, comprising a battery case (1), the battery case (1) including a top shell plate (2), and an electric core (3) being installed inside the battery case (1), characterized in that, Further comprising: Two sets of mounting components, which are mounted on the inner wall of the battery case (1) between the top shell plate (2) and the battery cell (3), and the two sets of mounting components are symmetrically arranged about the vertical central axis of the battery case (1); A mica plate (20), which is mounted between the two mounting components; A torsion assembly mounted in the mounting component. When the high-pressure gas or flame ejected by the battery cell (3) when it undergoes thermal runaway acts on the mica plate (20) with a force exceeding a preset value, the torsion assembly causes the mica plate (20) to bend towards the direction close to the battery cell (3).

2. The mica plate mounting structure of the power battery according to claim 1, characterized in that: The mounting component includes two fixing blocks (4), and the two fixing blocks (4) are respectively fixed on the inner walls of the same side and opposite sides of the battery case (1). A circular groove is formed on the outer wall of the fixing block (4), and a circular block (5) is rotatably mounted in the circular groove. A sliding groove (6) along the diameter direction is formed on the outer wall of the circular block (5), and a sliding block (7) is slidably mounted in the sliding groove (6). The outer walls of the two sliding blocks (7) on the same side are jointly fixed with a U-shaped strip (9). The U-shaped strip (9) includes an inner groove (18), and the opening direction of the inner groove (18) faces the central position of the battery cell (3). A fixing structure for fixing the mica plate (20) is mounted on the inner wall of the inner groove (18).

3. The mica plate mounting structure of the power battery according to claim 2, characterized in that: The torsion assembly includes a torsion spring (12) mounted between the circular block (5) and the circular groove of the fixing block (4); Further comprising a limit card slot (15) formed on the outer wall of the fixing block (4). The width of the limit card slot (15) is the same as the width of the sliding block (7). Through holes for inserting a shear pin (8) are formed on the outer walls of the fixing block (4) and the sliding block (7).

4. The mica plate mounting structure of the power battery according to claim 2, characterized in that: The fixing structure includes a plurality of connecting rods (10) rotatably mounted on the inner top of the inner groove (18), and a groove for the connecting rods (10) to extend into is formed on the inner top of the inner groove (18). The bottom ends of the plurality of connecting rods (10) are jointly rotatably mounted with a pressing plate (11). A protruding strip (16) is provided at the bottom of one side of the pressing plate (11); Further comprising an insertion hole (17) formed inside the U-shaped strip (9), and the rotation point of the insertion hole (17) and the connecting rod (10) is located on the same horizontal plane. A through hole (21) is formed inside each connecting rod (10), and the through hole (21) penetrates through the rotation point of the connecting rod (10) on the inner groove (18). When the pressing plate (11) presses and fixes the mica plate (20), the insertion hole (17) is communicated with the through hole (21); Further comprising an insertion rod (22) that can be inserted into the insertion hole (17) and the through hole (21).

5. The mica plate mounting structure of the power battery according to claim 2, characterized in that: The fixing structure includes a threaded hole formed on the U-shaped strip (9), and a locking screw (23) for pressing and fixing the mica plate (20) is threadedly connected in the threaded hole.

6. The mica plate mounting structure of the power battery according to claim 4, characterized in that: The connecting rod (10) is arranged as an elastic telescopic rod.

7. The mica plate mounting structure of the power battery according to claim 4, wherein: An extension part (19) is fixed on the outer wall of the pressing plate (11) above the mica plate (20), and the extension part (19) is in contact with and abuts against the top outer wall of the mica plate (20).

8. The mica plate mounting structure of the power battery according to claim 3, characterized in that: When the sliding block (7) slides into the sliding groove (6), the height of the mica plate (20) is higher than the height of the center of the circular block (5).

9. The mica plate mounting structure of the power battery according to claim 3, characterized in that: A central hole (14) is formed in the outer wall of the sliding block (7). A hollow tube (13) is fixed at the center of the circular block (5) and is rotatably installed in the circular groove of the fixed block (4) through the hollow tube (13). The hollow tube (13) communicates with the outside. When the sliding block (7) moves down to the limit card slot (15), the hollow tube (13) and the central hole (14) are staggered from each other.

10. The mica plate mounting structure of the power battery according to claim 4, wherein: Anti-slip patterns are formed on the inner bottom of the inner groove (18) and the outer wall of the pressing plate (11).

11. The mica plate mounting structure of the power battery according to claim 7, characterized in that: The length of the extension part (19) is less than the distance from the pressing plate (11) to the center of the mica plate (20).

Images