Lithium iron phosphate explosion-proof battery

Abstract

The utility model relates to the field of lithium iron phosphate battery, especially lithium iron phosphate explosion -proof battery, including box, lid and explosion -proof mechanism. The lid is equipped with sealing pipe and explosion -proof mechanism, and the explosion -proof mechanism is composed of mounting groove, sealing plate, trigger part and drive part. Drive part separates the box interior into double -chamber through sleeve, guide bush and compression spring, and real -time monitoring pressure difference, when pressure is abnormal, sleeve displacement drive rack -pinion linkage mechanism makes symmetrical clamping block separate, and the fastening bolt is relaxed, and sealing plate opens automatically and releases pressure. The trigger part adopts reverse thread screw rod and symmetrical clamping block design, ensures normal sealing property and fast reset ability. The structure realizes dynamic pressure response through mechanical linkage, and after pressure relief, can be repeatedly used through spring reset, has the advantages such as high sensitivity, reliable sealing, convenient maintenance, effectively avoids the explosion risk that the battery leads to because of internal pressure is too high.

Description

Technical Field

[0001] This utility model relates to the field of lithium iron phosphate batteries, and in particular to an explosion-proof lithium iron phosphate battery. Background Technology

[0002] Lithium iron phosphate batteries are widely used in energy storage systems, electric vehicles, and other fields due to their high safety and long cycle life. However, under extreme conditions such as high temperature, overcharging, or internal failure, the chemical reaction inside the battery may produce a large amount of gas, causing a sharp increase in pressure and posing a risk of explosion.

[0003] Existing explosion-proof technologies mostly employ a single pressure relief valve or mechanical sealing structure, but these have the following problems: First, traditional pressure relief valves have a fixed response pressure threshold, making it difficult to dynamically adapt to complex changes in internal pressure, which may lead to delayed pressure relief or false triggering; Second, the sealing structure is prone to seal failure due to material aging or mechanical wear after long-term use, and it is difficult to quickly reset after triggering, resulting in high maintenance costs; Third, some explosion-proof devices have complex structures, rely on electronic sensors or external control, have low reliability, and are difficult to achieve autonomous pressure relief without external energy.

[0004] Therefore, there is an urgent need to design a simple, responsive, and reusable explosion-proof mechanism to quickly release gas when the internal pressure of the battery is abnormal, while ensuring sealing performance and long-term stability. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a lithium iron phosphate explosion-proof battery. This battery achieves dynamic pressure response through mechanical linkage, and can be reused after pressure relief by spring reset, effectively avoiding the risk of battery explosion due to excessive internal pressure. Specifically, this is achieved through the following technical solution.

[0006] This utility model discloses an explosion-proof lithium iron phosphate battery, comprising a casing, a cover, and an explosion-proof mechanism. The cover is installed on the top of the casing, and the explosion-proof mechanism is installed in the middle of the cover.

[0007] The cover has through holes penetrating its upper and lower surfaces, and the explosion-proof mechanism includes a mounting slot, a sealing plate, a triggering part, and a driving part.

[0008] The sealing plate is installed in the mounting slot by fastening bolts to seal the through hole.

[0009] The drive unit includes a sleeve and a guide sleeve. The sleeve is fitted on the outside of the guide sleeve, and a compression spring is provided between the two to form a double-cavity structure that divides the inside of the housing into a first chamber and a second chamber.

[0010] The triggering part includes a mechanical linkage component. When abnormal pressure inside the housing causes sleeve displacement, the mechanical linkage component drives the triggering part to release the fastening bolt, causing the sealing plate to disengage from the mounting slot to release pressure.

[0011] Preferably, the triggering part includes two symmetrically distributed sets of locking blocks. The locking blocks cooperate with the screw, and the spacing between the locking blocks is adjusted by rotating the screw to achieve the locking or unlocking of the fastening bolt.

[0012] Preferably, the screw's threads are symmetrically arranged about its center, and the screw is coaxially fixed with the gear, the gear meshes with the rack, and the rack is driven to slide by the sleeve displacement.

[0013] Preferably, the sleeve of the drive unit is connected to the rack via a drive rod and a drive shaft, and the drive shaft is slidably disposed in a guide groove provided on the cover;

[0014] The rack is slidably disposed within the guide rail, which is installed at the bottom of the second mounting groove, which is located on the cover.

[0015] Preferably, the bottom of the mounting slot is provided with an annular sealing strip, and the lower surface of the sealing plate is provided with a groove that nests and cooperates with the sealing strip.

[0016] Preferably, sealing tubes are installed on both sides of the cover, and the sealing tubes are connected to the inner cavity of the drive unit through a balance channel for initial pressure balance.

[0017] Preferably, the compression spring drives the sleeve to reset after decompression, so that the trigger part returns to the snap-fit ​​state with the fastening bolt.

[0018] Preferably, the end of the locking block near the fastening bolt is provided with a thread structure that matches the bolt thread.

[0019] Preferably, the fastening bolts installed on the sealing plate are symmetrically distributed on both sides of the through hole and are coaxially configured with the locking block of the trigger part.

[0020] After adopting the above technical solution, the beneficial effects of this utility model are:

[0021] 1. A dual-chamber structure consisting of a sleeve, guide sleeve, and compression spring is used to monitor the internal pressure difference of the battery in real time. When the pressure is abnormal, the sleeve displacement triggers the separation of the locking block through a linkage mechanism of drive rod, rack and pinion, quickly loosening the fastening bolts and realizing the automatic opening of the sealing plate, significantly improving the pressure relief sensitivity and response speed.

[0022] 2. The sealing plate and the mounting groove adopt a nested design of annular sealing strip and groove, combined with symmetrically distributed fastening bolts, to ensure high sealing performance under normal conditions; the triggering part achieves bidirectional locking of the fastening bolts through the cooperation of symmetrical locking blocks and reverse threaded screws, preventing accidental triggering, and facilitating installation and maintenance.

[0023] 3. After depressurization, the compression spring drives the sleeve to reset, the chamber pressure returns to balance, and the trigger can readjust the spacing of the locking blocks by rotating the screw, so that the sealing plate is reset and the sealing state is restored, thus extending the service life of the device.

[0024] 4. The explosion-proof mechanism adopts a split design, with components such as the sealing tube and triggering part independently installed on the cover, supporting quick replacement and maintenance, and reducing maintenance costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A 3D view of a lithium iron phosphate explosion-proof battery;

[0027] Figure 2 This is a partial sectional disassembly diagram of the box lid;

[0028] Figure 3 for Figure 2 A three-dimensional view of the central structure from another perspective;

[0029] Figure 4 This is the front view of the box lid;

[0030] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0031] Figure 6 For along Figure 4 Sectional view of the middle BB line;

[0032] Figure 7 for Figure 5 A magnified view of part A in the middle;

[0033] Figure 8 This is a schematic diagram of the trigger section and the drive section;

[0034] Figure 9 for Figure 6 A magnified view of part B in the middle;

[0035] Figure 10 for Figure 5 A magnified view of part C in the middle.

[0036] Explanation of reference numerals in the attached figures:

[0037] 101-Box body, 102-Box cover, 103-Sealing tube, 104-Electrode;

[0038] 200-Explosion-proof mechanism, 201-Mounting slot, 202-Sealing plate, 203-Fasting bolt, 204-Through hole, 205-Mounting hole, 206-First mounting slot, 207-Groove, 208-Sealing strip;

[0039] 210-Drive unit, 211-Sleeve, 212-Guide sleeve, 213-Compression spring, 214-Balance channel;

[0040] 220-Trigger part, 221-Drive rod, 222-Drive shaft, 223-Guide groove, 224-Rack, 225-Guide rail, 226-Second mounting groove, 227-Gear, 228-Screw, 229-Clocking block. Detailed Implementation

[0041] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. Those skilled in the art will recognize that this utility model can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it.

[0042] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] An embodiment of this utility model provides a lithium iron phosphate explosion-proof battery, see [link to relevant documentation]. Figure 1The lithium iron phosphate explosion-proof battery includes a housing 101 and a cover 102. The housing 101 contains a positive electrode, a negative electrode, a separator, and an electrolyte. The cover 102 is installed on the top of the housing 101 to seal the housing 101. Electrodes 104 are fixedly installed at both ends of one side of the cover 102. The electrodes 104 are electrically connected to the electrode plates inside the housing 101. Sealing tubes 103 are installed at both ends of the other side of the cover 102, and the sealing tubes 103 connect the inside of the housing 101 to the outside.

[0044] The sealing tube 103 is equipped with a plug for sealing and blocking the sealing tube 103, so as to achieve the sealing of the inside of the box 101.

[0045] For a further explanation of the above embodiments, see Figure 2 , Figure 3 , Figure 5 , Figure 10 An explosion-proof mechanism 200 is installed in the middle of the box cover 102. The explosion-proof mechanism 200 includes a mounting slot 201. A sealing plate 202 is installed in the mounting slot 201. The sealing plate 202 is used to seal and block the through hole 204. The through hole 204 is opened on the box cover 102 and penetrates the upper and lower surfaces of the box cover 102.

[0046] Several annular sealing strips 208 are fixed circumferentially at the bottom of the mounting slot 201. The lower surface of the sealing plate 202 is provided with a groove 207 that matches the sealing strips 208. When the sealing plate 202 is installed in the mounting slot 201, the sealing strips 208 are just embedded in the groove 207, thereby better sealing the through hole 204 by the sealing plate 202.

[0047] Both ends of the sealing plate 202 are installed in the mounting holes 205 by fastening bolts 203. The mounting holes 205 are opened on the upper surface of the cover 102. A first mounting groove 206 is opened in a direction perpendicular to the axis of the mounting hole 205 and perpendicular to the length direction of the through hole 204. The first mounting groove 206 passes through the side of the mounting hole 205. A trigger part 220 that can intermittently engage with the fastening bolts 203 is installed in the first mounting groove 206.

[0048] When gas is generated inside the housing 101 due to high temperature, the internal pressure of the housing 101 increases. The trigger part 220 is no longer engaged with the fastening bolt 203 due to the pressure, so the fastening bolt 203 can no longer fasten the sealing plate 202 in the mounting slot 201. At this time, the flue gas inside the housing 101 passes through the through hole 204 and breaks through the sealing plate 202 to be discharged outward, avoiding battery explosion caused by excessive internal pressure of the housing 101.

[0049] For a further explanation of the above embodiments, see Figures 4-9The explosion-proof mechanism 200 also includes a drive unit 210, which is used to convert the pressure inside the housing 101 into driving force, thereby switching the state of the trigger unit 220.

[0050] The drive unit 210 includes a sleeve 211 and a guide sleeve 212. The sleeve 211 is sealed on the outside of the guide sleeve 212. The guide sleeve 212 is installed at the bottom of the cover 102. Several compression springs 213 are installed inside the sleeve 211 and the guide sleeve 212. The two ends of the compression springs 213 are fixed to the sleeve 211 and the guide sleeve 212 respectively.

[0051] The guide sleeve 212 is fixed to the first end of the balance channel 214, and the first end of the balance channel 214 is connected to the inner cavity formed by the sleeve 211 and the guide sleeve 212. The other end of the balance channel 214 is fixedly connected to the sealing tube 103.

[0052] The above structure divides the interior of the housing 101 into two non-communicating chambers through the sleeve 211 and the guide sleeve 212. During the installation of the housing 101, the two chambers are connected to the outside and are therefore in a state of pressure balance. When the housing 101 is assembled, the sealing tube 103 is sealed by the plug, and the through hole 204 is sealed by the sealing plate 202, the two chambers are completely separated.

[0053] When the temperature inside the housing 101 rises and generates flue gas, causing the pressure to increase, a pressure difference appears between the two chambers. Under high pressure, the sleeve 211 compresses the compression spring 213. At this time, the sleeve 211 is displaced relative to the guide sleeve 212. This displacement is used to switch the state of the trigger part 220, thereby loosening the fastening bolt 203, releasing the internal pressure of the housing 101, and preventing the battery from exploding.

[0054] In addition, after the internal pressure of the battery is released, the pressure of the two chambers is balanced again. The compression spring 213 pushes the sleeve 211 back to its original position. At this time, 220 returns to its initial state. Therefore, the sealing plate 202 can be re-fastened to the mounting slot 201 by the fastening bolt 203, realizing the reuse of the explosion-proof mechanism 200.

[0055] The triggering part 220 includes a drive rod 221. The first end of the drive rod 221 is hinged to the outer surface of the sleeve 211, and the second end of the drive rod 221 is hinged to the first end of the drive shaft 222. The drive shaft 222 is slidably disposed in the guide groove 223 opened on the cover 102. The second end of the drive shaft 222 is fixed to the rack 224. The rack 224 is slidably disposed in the guide rail 225. The guide rail 225 is fixedly installed at the bottom of the second mounting groove 226, which is opened on the cover 102.

[0056] The rack 224 meshes with the gear 227, the gear 227 is coaxially fixed with the first end of the screw 228, the screw 228 is sealed and rotatably mounted on the cover 102, the threads on the outer surface of the screw 228 are symmetrically arranged about the center of the screw 228, that is, the threads on both sides of the screw 228 have opposite helical directions, and a set of locking blocks 229 are installed on both sides of the screw 228, the locking blocks 229 are slidably arranged in the first mounting groove 206.

[0057] Among them, the trigger part 220 is symmetrically distributed in two groups about the center of the sleeve 211, and then respectively cooperates with the fastening bolts 203 installed on both sides of the sealing plate 202 to facilitate the installation and sealing fixation of the sealing plate 202.

[0058] Among them, the two sets of locking blocks 229 are provided with threads that mate with the threads of the fastening bolts 203 at their close ends, thereby facilitating the tightening and installation of the fastening bolts 203.

[0059] When the battery is working normally, the two sets of clips 229 are arranged coaxially with the through hole 204 on the side that is close to each other, which facilitates the installation of the fastening bolt 203.

[0060] In the above structure, the relative distance between the two sets of locking blocks 229 can be adjusted by rotating the screw 228. When the battery is working normally, the distance between the two sets of locking blocks 229 is the smallest. At this time, the fastening bolt 203 can be threadedly connected to the two sets of locking blocks 229. Thus, under the connection relationship between the fastening bolt 203 and the locking blocks 229, the sealing plate 202 can be sealed in the mounting slot 201 to form a sealing block against the through hole 204.

[0061] When the battery generates smoke, causing the sleeve 211 to slide relative to the guide sleeve 212, the sleeve 211 pushes the rack 224 to slide along the guide rail 225 through the drive rod 221 and drive shaft 222. Furthermore, the meshing relationship between the rack 224 and the gear 227 drives the rotation of the gear 227 and the screw 228. At this time, under the driving action of the rotation of the screw 228, the two sets of locking blocks 229 move away from each other, thus failing to lock the fastening bolt 203. That is, the fastening bolt 203 cannot continue to fasten the sealing plate 202 inside the mounting slot 201. Therefore, as the pressure inside the housing 101 increases, the internal smoke can easily push open the sealing plate 202 configured in the mounting slot 201 through the through hole 204, and then exhaust outward, realizing the depressurization inside the housing 101 and avoiding the explosion of the housing 101 due to excessive pressure.

[0062] The embodiments described above are not exhaustive, nor do they limit the scope of the present invention to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to effectively utilize the present invention and its modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lithium iron phosphate explosion-proof battery, comprising a casing (101), a casing cover (102), and an explosion-proof mechanism (200), wherein the casing cover (102) is installed on the top of the casing (101), and the explosion-proof mechanism (200) is installed in the middle of the casing cover (102), characterized in that: The cover (102) is provided with a through hole (204) that penetrates its upper and lower surfaces. The explosion-proof mechanism (200) includes a mounting slot (201), a sealing plate (202), a trigger part (220), and a drive part (210). The sealing plate (202) is installed in the mounting slot (201) by fastening bolts (203) to seal the through hole (204). The drive unit (210) includes a sleeve (211) and a guide sleeve (212). The sleeve (211) is sleeved on the outside of the guide sleeve (212), and a compression spring (213) is provided between the two to form a double-cavity structure that divides the interior of the housing (101) into a first chamber and a second chamber. The trigger part (220) includes a mechanical linkage component. When the pressure inside the housing (101) is abnormal and causes the sleeve (211) to shift, the mechanical linkage component drives the trigger part (220) to release the fastening bolt (203) so that the sealing plate (202) can disengage from the mounting slot (201) to release pressure.

2. The lithium iron phosphate explosion-proof battery according to claim 1, characterized in that: The trigger part (220) includes two sets of symmetrically distributed locking blocks (229). The locking blocks (229) cooperate with the screw (228). The spacing between the locking blocks (229) is adjusted by rotating the screw (228) to achieve the locking or disengagement of the fastening bolt (203).

3. The lithium iron phosphate explosion-proof battery according to claim 2, characterized in that: The screw (228) has a thread symmetrical about its center, and the screw (228) is fixed coaxially with the gear (227). The gear (227) meshes with the rack (224), and the rack (224) is driven to slide by the displacement of the sleeve (211).

4. The lithium iron phosphate explosion-proof battery according to claim 3, characterized in that: The sleeve (211) of the drive unit (210) is connected to the rack (224) via the drive rod (221) and the drive shaft (222), and the drive shaft (222) is slidably disposed in the guide groove (223) opened on the cover (102); The rack (224) is slidably disposed in the guide rail (225), which is installed at the bottom of the second mounting groove (226), which is opened on the cover (102).

5. The lithium iron phosphate explosion-proof battery according to claim 1, characterized in that: The bottom of the mounting slot (201) is provided with an annular sealing strip (208), and the lower surface of the sealing plate (202) is provided with a groove (207) that is nested and matched with the sealing strip (208).

6. The lithium iron phosphate explosion-proof battery according to claim 1, characterized in that: Sealing tubes (103) are installed on both sides of the cover (102). The sealing tubes (103) are connected to the inner cavity of the drive unit (210) through the balance channel (214) for initial pressure balance.

7. The lithium iron phosphate explosion-proof battery according to claim 1, characterized in that: After the compression spring (213) is depressurized, it drives the sleeve (211) to reset, so that the trigger part (220) returns to the snap-fit ​​state of the fastening bolt (203).

8. The lithium iron phosphate explosion-proof battery according to claim 2, characterized in that: The end of the locking block (229) near the fastening bolt (203) is provided with a thread structure that matches the bolt thread.

9. The lithium iron phosphate explosion-proof battery according to claim 1, characterized in that: The fastening bolts (203) installed on the sealing plate (202) are symmetrically distributed on both sides of the through hole (204) and are coaxially configured with the locking block (229) of the trigger part (220).

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