Split type lithium battery and maintenance port

Abstract

The invention relates to the technical field of lithium batteries, in particular to a split type lithium battery and a maintenance port, the split type lithium battery and maintenance port comprises an outer protective shell and a top cover, a plurality of lithium batteries are arranged in the outer protective shell, a protective unit is arranged between adjacent lithium batteries, a connecting wire is arranged between two adjacent protective units, each protective unit comprises a partition plate, and the partition plates are arranged in the outer protective shell. A miniature electric push rod is arranged at the bottom end of the interior of the partition plate, a cut-off tool and an ejector rod are arranged at the output end of the miniature electric push rod, the position of the lithium battery with the volume expanded due to failure in the outer protective shell can be accurately detected through assistance of a plurality of pressure sensors, and then the miniature electric push rod is controlled to be started. The cut-off knife can realize power-off isolation on the lithium battery, further faults of the lithium battery are avoided, the lithium batteries on the two sides of the lithium battery can be electrically connected through assistance of components such as a connecting wire and a plug, and it is ensured that the whole device continues to supply power.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a split lithium battery and a maintenance port. Background Art

[0002] Under the pressure of energy crisis and environmental pollution, safety, environmental protection and energy conservation have become the themes of today's development. New energy lithium batteries are highly valued and strongly supported by the transportation and energy departments due to their advantages of small size, energy saving, environmental protection and pollution-free.

[0003] A split lithium battery pack module that can be connected in series and parallel is disclosed in Chinese patent application number CN202411001698.9, which relates to the field of battery technology. The module includes a plurality of battery cells, a mounting seat, a splint assembly, and a buffer seat connected in series and parallel. The splint assembly is arranged on the top of one side of the mounting seat. The splint assembly is located between two adjacent battery cells. During the heat conduction process of the multiple battery cells through the heat conducting plates and heat conducting columns, the heat will be absorbed by the coolant in the elastic bag.

[0004] The Chinese patent application number CN202210748608.7 is a split lithium battery used in an explosion-proof cavity, including a protective mechanism, a lithium battery mounting assembly, a driving mechanism, a transmission part and a heat dissipation assembly. The protective mechanism includes a fixed shell with ventilation holes, the driving mechanism is installed at the bottom of the fixed shell, the transmission part is movably sleeved on the outside of the driving mechanism, the lithium battery mounting assembly is installed above the fixed shell, and the heat dissipation assembly is installed in the ventilation holes.

[0005] During use, when a lithium battery fails, the lithium battery tends to expand and increase in volume. The increase in the volume of the lithium battery will reduce the internal space of the outer protective shell, which is not conducive to heat dissipation. In addition, when a lithium battery fails and expands, if the faulty lithium battery is not powered off in time, there is a risk of fire and explosion. Testing each lithium battery through the detection connector using external equipment requires disassembly of the entire split lithium battery, which is time-consuming and labor-intensive, further increasing the risk of fire and explosion of the faulty lithium battery. In addition, when a lithium battery fails, it is easy to cause the power supply of the entire split lithium battery to stop, affecting the use of electrical equipment. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a split lithium battery and a maintenance port.

[0007] A split lithium battery of the present invention comprises an outer protective shell and a top cover, wherein a plurality of lithium batteries are arranged in the outer protective shell, a protective unit is arranged between adjacent lithium batteries, and a connecting line is arranged between two adjacent protective units; The protection unit includes a partition plate, a micro electric push rod is provided at the bottom end of the partition plate, a cutting knife and a push rod are provided at the output end of the micro electric push rod, a limiting sleeve is provided at the top middle part of the partition plate, a mounting disk is provided for sliding transversely in the limiting sleeve, a plug is provided for sliding at the side end of the mounting disk, a limiting ring is provided at the side end of the limiting sleeve, a pressure sensor is provided at the side end of the limiting ring, a first spring is provided between the limiting ring and the mounting disk, a second spring is provided between the plug and the mounting disk, a circular hole is provided in the middle of the limiting sleeve, a cylindrical head is provided at the upper end of the push rod, a channel is provided in the cylindrical head, a blocking block is provided at the upper end of the channel, a cavity is provided in the partition plate, and a hose is provided at the lower end of the cylindrical head.

[0008] By arranging components such as pressure sensors, micro electric push rods, cylindrical heads, channels, plugs, connecting wires and extension wires, with the assistance of multiple pressure sensors, the position of the lithium battery that has expanded in volume due to a fault in the outer protective shell can be accurately detected, and then by controlling the micro electric push rod to start, the cutting knife can be used to cut off power to and isolate the lithium battery, thereby avoiding further failure of the lithium battery, and the lithium batteries on both sides of the lithium battery can be electrically connected with the assistance of components such as connecting wires and plugs, ensuring that the entire device continues to be powered on. At the same time, when the risk of fire and explosion of the faulty lithium battery is detected to be increased with the assistance of the pressure sensor, the liquid carbon dioxide in the cavity can be converted into gaseous carbon dioxide and discharged through the channel, thereby having a cooling and flame retardant effect, thereby improving the safety of the device.

[0009] Preferably, the hose is elastic and extensible, the lower end of the channel is connected to the cavity through the hose, the upper end outlet of the channel is aligned with the solid part of the circular hole, the top of the cylindrical head is circular, and when the cylindrical head moves upward, it pushes the mounting plate to move away from the cylindrical head, liquid carbon dioxide is provided in the cavity, and a compression spring is provided between the two blocking blocks.

[0010] Preferably, both ends of the connecting wire are respectively located in two partition plates, the connecting wire is connected to a plug, and a jack matching the plug is provided at a side end of the lithium battery.

[0011] Preferably, a positive electrode connector and a negative electrode connector are provided on the top of the lithium battery, and a wiring lug is provided between the positive electrode connector and the negative electrode connector of two adjacent lithium batteries. The position of the cutting knife matches the wiring lug, and the jack near the positive electrode connector on the side end of the lithium battery is electrically connected to the positive electrode connector, and the jack near the negative electrode connector on the side end of the lithium battery is connected to the negative electrode connector.

[0012] Preferably, the two partition plates near the two sides are each provided with an extension line, and the two extension lines are respectively connected to the positive electrode connector and the negative electrode connector on the two lithium batteries on the two sides.

[0013] Preferably, a positive electrode terminal and a negative electrode terminal are provided on the top cover, the positive electrode terminal is electrically connected to the positive electrode connector of the lithium battery near the side end of the outer protective shell, and the negative electrode terminal is electrically connected to the negative electrode connector of the lithium battery near the other side of the outer protective shell.

[0014] Preferably, a limiting groove is provided at the bottom inner end of the outer protective shell, the lithium battery is located in the limiting groove, a first matching groove is provided at the top of the outer protective shell, and a second matching groove matching the first matching groove is provided at the lower end of the top cover.

[0015] A maintenance port for a split lithium battery includes a maintenance detection unit. The maintenance detection unit includes a detection connector. The detection connector is provided with a connecting soft ring. The connecting soft ring is provided with a soft cover. The soft cover matches the detection connector.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. With the assistance of multiple pressure sensors, the position of the lithium battery that has expanded due to a fault in the outer protective shell can be accurately detected. Then, by controlling the micro electric push rod to start, the cutting knife can cut off the power to the lithium battery and isolate it, avoiding further failure of the lithium battery.

[0017] 2. After detecting the faulty lithium battery, the lithium batteries on both sides of the lithium battery can be electrically connected with the help of components such as micro electric push rods, cylindrical heads, connecting wires and plugs to ensure that the entire device continues to be powered.

[0018] 3. When the pressure sensor detects that the risk of fire and explosion of the faulty lithium battery increases, the liquid carbon dioxide in the cavity can be converted into gaseous carbon dioxide and discharged through the channel, thereby having the effect of cooling and flame retardancy, thereby improving the safety of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic structural diagram of the positive electrode connector, negative electrode connector, and terminal piece of the present invention; Figure 3 It is a schematic structural diagram of the top cover and other components of the present invention; Figure 4 It is a schematic structural diagram of components such as the connecting wire and the protection unit of the present invention; Figure 5 It is a structural diagram of the maintenance detection unit of the present invention; Figure 6 It is a structural schematic diagram of the internal circuit connection of the present invention; Figure 7It is a schematic structural diagram of the limiting sleeve and cavity and other components of the present invention; Figure 8 It is a schematic structural diagram of the plug and cylindrical head and other components of the present invention; Figure 9 It is a schematic structural diagram of the cutting blade, the ejector rod and other components of the present invention.

[0020] Figure numerals: 1, outer protective shell; 2, top cover; 3, lithium battery; 4, protection unit; 5, connecting line; 6, maintenance and detection unit; 101, limiting groove; 102, first matching groove; 201, positive terminal; 202, negative terminal; 203, second matching groove; 301, positive connector; 302, negative connector; 303, terminal piece; 401, spacer; 402, micro electric push rod; 403, cutting knife; 404, ejector; 405, limiting sleeve; 406, mounting plate; 407, plug; 408, limiting ring; 409, first spring; 410, second spring; 411, round hole; 412, cylindrical head; 413, channel; 414, blocking block; 415, cavity; 416, hose; 417, extension line; 601, detection connector; 602, connecting soft ring; 603, soft cover. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] Example 1 like Figures 1 to 6 As shown, this embodiment discloses a split lithium battery, including an outer protective shell 1 and a top cover 2. A plurality of lithium batteries 3 are arranged in the outer protective shell 1. By placing the plurality of lithium batteries 3 in the outer protective shell 1, the plurality of lithium batteries 3 work together to supply power, thereby increasing its capacity.

[0023] A limiting groove 101 is provided at the bottom inner end of the outer protective shell 1, and the lithium battery 3 is located in the limiting groove 101. A first matching groove 102 is provided at the top of the outer protective shell 1, and a second matching groove 203 matching the first matching groove 102 is provided at the lower end of the top cover 2. When the lithium battery 3 is placed in the outer protective shell 1, the bottom of the lithium battery 3 is inserted into the limiting groove 101 for limiting. During the installation process of the top cover 2, the top cover 2 is placed on the upper end of the outer protective shell 1. By applying pressure to the top of the top cover 2, the first matching groove 102 and the second matching groove 203 are overlapped with each other, so that the top cover 2 is pressed into the top of the outer protective shell 1 to complete the packaging of the top of the outer protective shell 1. After the packaging is completed, the corresponding screw holes opened at the upper end of the top cover 2 are used to install and fix the screws. With the assistance of the outer protective shell 1 and the top cover 2, the internal lithium battery 3 is protected to prevent the lithium battery 3 from being directly impacted.

[0024] A positive terminal 301 and a negative terminal 302 are provided on the top of the lithium battery 3, and a wiring piece 303 is provided between the positive terminal 301 and the negative terminal 302 of two adjacent lithium batteries 3. When two adjacent lithium batteries 3 are connected, the negative terminal 302 of the first lithium battery 3 and the positive terminal 301 of the second lithium battery 3 are connected and conductive through the wiring piece 303, so that the two lithium batteries 3 are integrated into one, thereby doubling the capacitance, and in the event of a failure of the lithium battery 3, it can be determined by detection means, and the damaged lithium battery 3 can be replaced.

[0025] A positive terminal 201 and a negative terminal 202 are provided on the top cover 2. The positive terminal 201 is electrically connected to the positive terminal 301 of the lithium battery 3 near the side end of the outer protective shell 1, and the negative terminal 202 is electrically connected to the negative terminal 302 of the lithium battery 3 near the other side of the outer protective shell 1. If there are four lithium batteries 3 in the outer protective shell 1, the positive terminal 201 is electrically connected to the positive terminal 301 of the first lithium battery 3, and the negative terminal 202 is electrically connected to the negative terminal 302 of the fourth lithium battery 3, and the two adjacent lithium batteries 3 are electrically connected through the terminal piece 303. When the whole body is powered externally, the electrical equipment can be directly connected to the positive terminal 201 and the negative terminal 202.

[0026] This embodiment also discloses a maintenance port for a split lithium battery, including a maintenance and detection unit 6. The maintenance and detection unit 6 includes a detection connector 601. A connecting soft ring 602 is provided on the detection connector 601. A soft cover 603 is provided on the connecting soft ring 602. The soft cover 603 matches the detection connector 601. When the maintenance and detection unit 6 is not in use, the soft cover 603 is covered on the detection connector 601 so that the soft cover 603 and the detection connector 601 overlap, thereby preventing impurities from entering the detection connector 601 and affecting its use.

[0027] like Figure 6As shown, if there are four lithium batteries 3, the detection connector 601 will first be connected to the protection board. Figure 6 The square frame between the middle negative terminal 202 and the negative terminal 302 is a protection plate, which is then connected to the terminal piece 303, the positive terminal 301 of the first lithium battery 3 and the negative terminal 302 of the fourth lithium battery 3. The positive terminal 201 is connected to the positive terminal 301 of the first lithium battery 3, and the negative terminal 202 is connected to the negative terminal 302 of the fourth lithium battery 3 through the protection plate. When testing each lithium battery 3, by detecting the voltage at each terminal piece 303, the positive terminal 301 of the first lithium battery 3 and the negative terminal 302 of the fourth lithium battery 3, it is possible to determine whether the status of the corresponding lithium battery 3 is normal, which facilitates accurate judgment of the status of each lithium battery 3 and improves the efficiency of maintenance and testing.

[0028] During installation and use, the number of lithium batteries 3 is determined according to the size of the outer protective shell 1, and the lithium batteries 3 are placed one by one into the limiting grooves 101 in the outer protective shell 1. With the assistance of the limiting grooves 101, the lithium batteries 3 are prevented from shaking. After the lithium batteries 3 are placed.

[0029] If the number of lithium batteries 3 is four, Figure 2 For example, the negative terminal 302 of the first lithium battery 3 on the left is electrically connected to the positive terminal 301 of the second lithium battery 3 on the left through the terminal piece 303, and then connected in sequence. Figure 3 and Figure 6 The negative terminal 202 is first connected to the protection board, and then electrically connected to the negative terminal 302 of the fourth lithium battery 3, and the positive terminal 201 is directly connected to the positive terminal 301 of the first lithium battery 3.

[0030] The detection connector 601 is first electrically connected to the protection board, and then electrically connected to each terminal piece 303 , the positive terminal 301 of the first lithium battery 3 , and the negative terminal 302 of the fourth lithium battery 3 .

[0031] When the device is powered, if a lithium battery 3 fails, the socket of the external battery detection device is connected to the detection connector 601. By detecting the voltage at each terminal 303, the status of each lithium battery 3 can be judged, and accurate repair and replacement can be performed, thereby improving its maintenance efficiency.

[0032] Example 2 Based on the split lithium battery and maintenance port provided in the above embodiment, when the lithium battery 3 fails during use, the lithium battery 3 often expands and becomes larger in volume. The increase in the volume of the lithium battery 3 will reduce the internal space of the outer protective shell 1, which is not conducive to heat dissipation. In addition, when the lithium battery 3 fails and expands, if the faulty lithium battery 3 is not promptly powered off, there is a risk of fire and explosion. The detection of each lithium battery 3 cannot be performed in real time through the detection connector 601, further increasing the risk of fire and explosion of the faulty lithium battery 3. In addition, when the lithium battery 3 fails, it is easy to cause the power supply of the entire split lithium battery to stop, affecting the use of electrical equipment. Therefore, the following solution is proposed: like Figures 1 to 9 As shown, a protection unit 4 is provided between adjacent lithium batteries 3, and a connecting line 5 is provided between two adjacent protection units 4. When a lithium battery 3 fails, the lithium battery 3 is powered off with the assistance of the protection unit 4, and the two adjacent lithium batteries 3 of the lithium battery 3 are connected with the assistance of the protection unit 4 to avoid disconnection of the overall power supply.

[0033] The protection unit 4 includes a partition plate 401, and a micro electric push rod 402 is provided at the bottom end of the partition plate 401. The output end of the micro electric push rod 402 is provided with a cutting knife 403 and a push rod 404. When the device detects that the lithium battery 3 has expanded, in order to avoid further failure of the expanded lithium battery 3, the micro electric push rods 402 on both sides of the lithium battery 3 will start to move the cutting knife 403 upward. During the upward movement of the cutting knife 403, the wiring pieces 303 on both sides of the lithium battery 3 will be cut off, thereby achieving power off and isolation of the lithium battery 3, and avoiding further discharge of the lithium battery 3 to cause a greater accident.

[0034] A limiting sleeve 405 is provided at the top middle portion of the spacer plate 401, and a mounting plate 406 is slidingly provided inside the limiting sleeve 405, and a plug 407 is slidingly provided on the side end of the mounting plate 406, a limiting ring 408 is provided on the side end of the limiting sleeve 405, and a pressure sensor is provided on the side end of the limiting ring 408, a first spring 409 is provided between the limiting ring 408 and the mounting plate 406, and a second spring 410 is provided between the plug 407 and the mounting plate 406. When the lithium battery 3 expands, the volume of the lithium battery 3 increases, causing squeezing of the pressure sensor, causing the detection value of the pressure sensor to increase. When the mounting plate 406 moves, the plug 407 is driven to move with the assistance of the second spring 410, and in the initial state of the mounting plate 406, due to the action of the first spring 409, the mounting plate 406 is located in the limiting sleeve 405.

[0035] A circular hole 411 is provided in the middle of the limiting sleeve 405, and a cylindrical head 412 is provided at the upper end of the push rod 404. After the micro electric push rod 402 is started, the push rod 404 will move up, causing the cylindrical head 412 to move upward. When the cylindrical head 412 moves upward, it will apply pressure to the side end of the mounting plate 406, causing the mounting plate 406 to move. It should be noted that the distance between the two mounting plates 406 is smaller than the diameter of the cylindrical head 412 in the initial state.

[0036] A channel 413 is provided in the cylindrical head 412, a blocking block 414 is provided at the upper end of the channel 413, a cavity 415 is provided in the partition plate 401, a hose 416 is provided at the lower end of the cylindrical head 412, the lower end of the channel 413 is connected to the cavity 415 through the hose 416, liquid carbon dioxide is provided in the cavity 415, a compression spring is provided between the two blocking blocks 414, when the cylindrical head 412 is extended from the channel 413, the side end resistance of the blocking block 414 disappears, and the blocking block 414 will be pushed out under the action of the compression spring, so that the channel 413 is connected with the inside of the outer protective shell 1, and the lithium battery 3 is partially converted into gas due to the heat generated during use, and the gaseous carbon dioxide is discharged from the channel 413. In this process, the liquid carbon dioxide absorbs heat when it is converted into gas, thereby cooling the lithium battery 3 and reducing the risk of fire and explosion of the lithium battery 3.

[0037] The hose 416 is elastic and extensible. The upper end outlet of the channel 413 is aligned with the solid part of the circular hole 411. The top of the cylindrical head 412 is circular. When the cylindrical head 412 moves upward, it pushes the mounting plate 406 to move away from the cylindrical head 412. When the cylindrical head 412 rises, the hose 416 will extend without affecting the connection between the channel 413 and the cavity 415. The top of the cylindrical head 412 is circular, and when it cooperates with the mounting plate 406, it can make a smooth transition. When the cylindrical head 412 rises and falls in the circular hole 411, the blocking block 414 will be blocked by the solid part of the circular hole 411.

[0038] The two ends of the connecting wire 5 are respectively located in the two partition plates 401, and the connecting wire 5 is connected to the plug 407. A socket matching the plug 407 is provided at the side end of the lithium battery 3. When the plug 407 moves toward the direction of the lithium battery 3, the plug 407 can be inserted into the socket.

[0039] The position of the cutting knife 403 matches the terminal piece 303. The jack near the positive terminal 301 on the side of the lithium battery 3 is electrically connected to the positive terminal 301, and the jack near the negative terminal 302 on the side of the lithium battery 3 is connected to the negative terminal 302. Extension wires 417 are provided on the two partition plates 401 near both sides. The two extension wires 417 are respectively connected to the positive terminal 301 and the negative terminal 302 on the two lithium batteries 3 on both sides. When the lithium battery 3 fails and the power is cut off, the plugs 407 on both sides of the lithium battery 3 and the connecting wire 5 can be used to cross the lithium battery 3 to Figure 4 For example, when the middle lithium battery 3 fails and expands, the cylindrical heads 412 on both sides of the lithium battery 3 will rise, causing the plug 407 to extend from the limit sleeve 405. Since the socket of the expanded lithium battery 3 in the middle will be deformed, making it difficult to insert the plug 407, the plug 407 will be inserted into the sockets of the adjacent lithium batteries 3 on both sides. At this time, the cutting knife 403 will cut off the terminal piece 303 between the lithium battery 3 and the lithium batteries 3 on both sides. In this way, the lithium battery 3 with a fault in the middle is isolated without affecting the overall power supply to the outside.

[0040] The cutting blade 403 is made of insulating material, and the plug 407 is made of conductive material.

[0041] In the specific use process, it is assumed that the number of lithium batteries 3 is four. Figure 2 As shown, if the second lithium battery 3 on the left side fails and expands, the detection values ​​of the pressure sensors close to the second lithium battery 3 in the protection units 4 on both sides of the second lithium battery 3 will gradually increase.

[0042] When the detection value of the pressure sensor rises to the first threshold value, the built-in program in the protection board will control the micro electric push rods 402 in the protection units 4 on both sides of the second lithium battery 3 to start. At this time, the stroke of the micro electric push rods 402 is half of the total stroke. After the micro electric push rods 402 are started, the cutting knife 403 will move upward. During the upward movement of the cutting knife 403, the wiring piece 303 on its top will be cut off, thereby achieving power off and isolation of the second lithium battery 3, avoiding the continued power supply of the second lithium battery 3 and causing a larger fault or accident, thereby improving the safety of equipment use.

[0043] At the same time, after the micro electric push rod 402 is started, the push rod 404 will also move upward. The upward movement of the push rod 404 will drive the cylindrical head 412 to move upward. When the cylindrical head 412 moves upward, the cylindrical head 412 will exert pressure on the side end of the mounting plate 406, causing the mounting plate 406 to move toward the lithium battery 3. Due to the volume expansion of the second lithium battery 3, the plug 407 close to the side of the second lithium battery 3 cannot be inserted into the jack at the side end of the second lithium battery 3. The plug 407 close to the side of the second lithium battery 3 compresses the second spring 410 due to the pressure, thereby retracting the plug 407 into the mounting plate 406, and the two plugs 407 away from the side of the second lithium battery 3 will be inserted into the corresponding jacks of the first lithium battery 3 and the third lithium battery 3. At this time, under the action of the connecting line 5 between the protection units 4 on both sides of the second lithium battery 3, the first lithium battery 3 and the third lithium battery 3 will cross the second lithium battery 3 to be electrically connected, ensuring continued power supply as a whole.

[0044] If the detection value of the pressure sensor continues to rise to the second threshold value, it indicates that the fault of the second lithium battery 3 is serious, which may easily cause high temperature and even fire and explosion risks. At this time, the built-in program control of the protection board starts the micro-electric push rods 402 in the protection units 4 on both sides of the second lithium battery 3. At this time, the output end of the micro-electric push rod 402 extends to the limit distance. At this time, the cylindrical head 412 will extend from the circular hole 411. After the cylindrical head 412 extends from the circular hole 411, the resistance of the circular hole 411 to the blocking block 414 disappears. Under the action of the compression spring, the blocking block 414 is pushed out from the channel 413, and the liquid carbon dioxide in the cavity 415 will absorb heat and turn into gas. This process will absorb heat, thereby achieving a cooling effect on the outer protective shell 1, and the gaseous carbon dioxide can be effectively flame retardant and fire extinguishing after being discharged from the channel 413, reducing the risk of fire and explosion of the faulty lithium battery 3 and improving the safety of equipment use.

[0045] If the first lithium battery 3 on the left side fails and expands in volume, the detection value of the pressure sensor near the first lithium battery 3 on the side of the protection unit 4 between the first lithium battery 3 and the second lithium battery 3 will increase. When the detection value of the pressure sensor rises to a first threshold value, the built-in program in the protection board will control the micro electric push rod 402 in the protection unit 4 between the first lithium battery 3 and the second lithium battery 3 to start. At this time, the stroke of the micro electric push rod 402 is half of the total stroke. After the micro electric push rod 402 is started, the cutting knife 403 will move upward. During the upward movement of the cutting knife 403, the wiring piece 303 on its top will be cut off, thereby realizing power-off isolation of the first lithium battery 3, and avoiding the continued power supply of the first lithium battery 3 to cause a larger failure or accident.

[0046] At the same time, after the micro electric push rod 402 is started, the push rod 404 will also move upward. The upward movement of the push rod 404 will drive the cylindrical head 412 to move upward. When the cylindrical head 412 moves upward, the cylindrical head 412 will exert pressure on the side end of the mounting plate 406, causing the mounting plate 406 to move toward the lithium battery 3. Since the first lithium battery 3 has expanded in volume, the plug 407 close to the side of the first lithium battery 3 cannot be inserted into the jack at the side end of the first lithium battery 3. The plug 407 close to the side of the first lithium battery 3 compresses the second spring 410 due to the pressure, thereby retracting the plug 407 into the mounting plate 406, and the plug 407 close to the side of the second lithium battery 3 will be inserted into the jack of the second lithium battery 3. At this time, under the action of the extension line 417 close to the first lithium battery 3, the positive terminal 301 will cross the first lithium battery 3 and be electrically connected to the positive terminal 301 of the second lithium battery 3 to ensure continued power supply as a whole.

[0047] If the detection value of the pressure sensor continues to rise to the second threshold value, it indicates that the fault of the first lithium battery 3 is serious, which may easily cause high temperature and even fire and explosion risks. At this time, the built-in program control of the protection board starts the micro electric push rod 402 in the protection unit 4 between the first lithium battery 3 and the second lithium battery 3. At this time, the output end of the micro electric push rod 402 extends to the limit distance. At this time, the cylindrical head 412 will extend from the circular hole 411. After the cylindrical head 412 extends from the circular hole 411, the resistance of the circular hole 411 to the blocking block 414 disappears. Under the action of the compression spring, the blocking block 414 is pushed out from the channel 413, and the liquid carbon dioxide in the cavity 415 will absorb heat and turn into gas. This process will absorb heat, thereby achieving a cooling effect on the outer protective shell 1, and the gaseous carbon dioxide can be effectively flame retardant and fire extinguishing after being discharged from the channel 413, reducing the risk of fire and explosion of the faulty lithium battery 3.

[0048] If, with the assistance of the pressure sensor, the protection board detects that more than two lithium batteries 3 have failed, the risk of fire and explosion of the lithium batteries 3 in the outer protective shell 1 will be greatly increased. At this time, the device controls the micro-electric push rods 402 in all the protection units 4 to start to the limit distance, so that all the wiring pieces 303 are cut off, thereby achieving overall power-off protection. At the same time, the channels 413 of all protection units 4 will discharge gaseous carbon dioxide, increasing the carbon dioxide concentration in the outer protective shell 1. In this process, as the liquid carbon dioxide is converted into gaseous carbon dioxide, the heat absorption can be used to cool the inner part of the outer protective shell 1, thereby reducing the risk of fire and explosion of the lithium batteries 3 and improving the safety of the equipment.

[0049] The main functions achieved by the present invention are: by setting components such as pressure sensors, micro electric push rods 402, cylindrical heads 412, channels 413, plugs 407, connecting wires 5 and extension wires 417, with the assistance of multiple pressure sensors, the position of the lithium battery 3 that has expanded due to a fault in the outer protective shell 1 can be accurately detected, and then by controlling the micro electric push rod 402 to start, the cutting knife 403 can be used to cut off the power to and isolate the lithium battery 3, thereby avoiding further failure of the lithium battery 3, and the lithium batteries 3 on both sides of the lithium battery 3 can be electrically connected with the assistance of components such as connecting wires 5 and plugs 407, ensuring that the entire device continues to be powered on. At the same time, when the risk of fire and explosion of the faulty lithium battery 3 is detected to be increased with the assistance of the pressure sensor, the liquid carbon dioxide in the cavity 415 can be converted into gaseous carbon dioxide and discharged through the channel 413, thereby achieving a cooling and flame retardant effect, thereby improving the safety of the device.

[0050] The installation, connection or setting methods of the split lithium battery and the maintenance port of the present invention are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented.

[0051] All technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A split lithium battery, comprising an outer protective shell (1) and a top cover (2), characterized in that: A plurality of lithium batteries (3) are arranged in the outer protective shell (1), a protective unit (4) is arranged between adjacent lithium batteries (3), and a connecting line (5) is arranged between two adjacent protective units (4); The protection unit (4) comprises a spacer (401), a micro electric push rod (402) is provided at the bottom end of the spacer (401), a cutting knife (403) and a push rod (404) are provided at the output end of the micro electric push rod (402), a limiting sleeve (405) is provided at the top end of the middle part of the spacer (401), a mounting plate (406) is provided in the limiting sleeve (405) for horizontal sliding, a plug (407) is provided at the side end of the mounting plate (406), a limiting ring (408) is provided at the side end of the limiting ring (408), and a pressure sensor is provided at the side end of the limiting ring (408). A sensor is provided, a first spring (409) is provided between the limiting ring (408) and the mounting plate (406), a second spring (410) is provided between the plug (407) and the mounting plate (406), a circular hole (411) is provided in the middle of the limiting sleeve (405), a cylindrical head (412) is provided at the upper end of the push rod (404), a channel (413) is provided in the cylindrical head (412), a blocking block (414) is provided at the upper end of the channel (413), a cavity (415) is provided in the spacer (401), and a hose (416) is provided at the lower end of the cylindrical head (412).

2. The split lithium battery according to claim 1, wherein: The hose (416) is elastic and ductile. The lower end of the channel (413) is connected to the cavity (415) through the hose (416). The upper end outlet of the channel (413) is aligned with the solid part of the circular hole (411). The top of the cylindrical head (412) is circular. When the cylindrical head (412) moves upward, it pushes the mounting plate (406) to move away from the cylindrical head (412). Liquid carbon dioxide is provided in the cavity (415). A compression spring is provided between the two blocking blocks (414).

3. The split lithium battery according to claim 1, wherein: The two ends of the connecting wire (5) are respectively located in two partition plates (401), the connecting wire (5) is connected to the plug (407), and a socket matching the plug (407) is provided at the side end of the lithium battery (3).

4. The split lithium battery according to claim 1, wherein: A positive electrode connector (301) and a negative electrode connector (302) are provided on the top of the lithium battery (3); a wiring piece (303) is provided between the positive electrode connector (301) and the negative electrode connector (302) between two adjacent lithium batteries (3); the position of the cutting knife (403) matches the wiring piece (303); a socket at the side end of the lithium battery (3) close to the positive electrode connector (301) is electrically connected to the positive electrode connector (301); and a socket at the side end of the lithium battery (3) close to the negative electrode connector (302) is connected to the negative electrode connector (302).

5. The split lithium battery according to claim 4, characterized in that: Extension wires (417) are provided on the two partition plates (401) near the two sides, and the two extension wires (417) are respectively connected to the positive electrode connector (301) and the negative electrode connector (302) on the two lithium batteries (3) on the two sides.

6. The split lithium battery according to claim 4, wherein: The top cover (2) is provided with a positive electrode terminal (201) and a negative electrode terminal (202); the positive electrode terminal (201) is electrically connected to a positive electrode connector (301) of the lithium battery (3) near a side end of the outer protective shell (1); and the negative electrode terminal (202) is electrically connected to a negative electrode connector (302) of the lithium battery (3) near the other side of the outer protective shell (1).

7. The split lithium battery according to claim 1, wherein: A limiting groove (101) is provided at the inner bottom end of the outer protective shell (1), the lithium battery (3) is located in the limiting groove (101), a first matching groove (102) is provided at the top of the outer protective shell (1), and a second matching groove (203) matching the first matching groove (102) is provided at the lower end of the top cover (2).

8. A maintenance port for a split lithium battery as claimed in claim 1, characterized in that: The maintenance detection unit (6) includes a detection connector (601), a connecting soft ring (602) is provided on the detection connector (601), a soft cover (603) is provided on the connecting soft ring (602), and the soft cover (603) matches the detection connector (601).

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