A lithium battery safety connection bus

Abstract

The present application relates to the technical field of lithium battery connection, and discloses a lithium battery safety connection busbar, including a terminal block, a sealed end cover, an outer porcelain sleeve, a resistor coating, an arc extinguishing grid, an arc extinguishing coating, a spring-shaped transmission line, a magnet ring and ultrafine quartz sand; the present application is a porcelain sleeve composite structure, with terminal blocks at both ends, and the terminal blocks are all led out from the middle of the sealed end cover, the lithium battery spring-shaped transmission line is provided with an outer porcelain sleeve along the axial outside, and a resistor coating arranged in a circular ring shape is provided inside the outer porcelain sleeve; an arc extinguishing grid is provided between each interval of the resistor coating; an arc extinguishing coating is provided inside the resistor coating; the spring-shaped transmission line is made of current deformation memory alloy material, and is in a contracted state when the rated current is reached, the spring-shaped transmission line connects the terminal blocks at both ends, and a plurality of magnet rings with the same polarity and mutually exclusive arrangement are provided in the middle sleeve of the spring-shaped transmission line, and the empty space in the middle of the lithium battery spring-shaped transmission line is filled with ultrafine quartz sand, which has the characteristic of automatically extinguishing the arc in case of any point fault.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery connection equipment, and in particular to a lithium battery safety connection busbar. Background Art

[0002] Lithium battery energy storage systems or electric vehicles have a high problem of battery thermal runaway fires. The cause of fires in energy storage systems also lies in the DC transmission system. Since the high-current DC feeder system does not have the natural frequency zero point of the AC power supply, once an open circuit or short circuit occurs, continuous arc burning will occur at the fault point. Since the current of the DC lithium battery transmission line is large and the internal resistance of the lithium battery is extremely small, once a short circuit or poor contact wire arcs, even if the DC circuit breaker trips, it cannot extinguish the fire caused by the arc at the fault point. Summary of the invention

[0003] In order to quickly extinguish DC arcs and essentially play an effective role in fire prevention, the present application provides a lithium battery safety connection busbar.

[0004] The present application provides a lithium battery safe connection busbar, which adopts the following technical solution:

[0005] A lithium battery safety connection busbar comprises a terminal block, a sealed end cap, a high temperature resistant insulating sleeve, a resistor coating, an arc extinguishing grid, an arc extinguishing coating, an elastic and retractable transmission line, a magnet ring and an insulating heat dissipation filler; the high temperature resistant insulating sleeve is axially sleeved on the outer circumference of the elastic and retractable transmission line; the resistor coating is arranged inside the high temperature resistant insulating sleeve, and the resistor coating is arranged in sections, and the arc extinguishing grid is arranged between each section; the arc extinguishing coating is arranged inside the resistor coating; both ends of the elastic and retractable transmission line are electrically connected to a terminal block, and the sealed end caps are arranged at the ends of the high temperature resistant insulating sleeve; the terminal blocks are led out from the sealed end caps at the corresponding ends; the insulating heat dissipation filler is filled in the empty space in the middle of the elastic and retractable transmission line located in the high temperature resistant insulating sleeve; the elastic and retractable transmission line is made of heat shrinkable material.

[0006] By adopting the above technical scheme, the high temperature resistant insulating material has good insulation performance and high temperature resistance, which can effectively isolate electrical components and prevent the risk of fire or electric shock caused by short circuit or high temperature. The spring-shaped transmission line not only increases the flexibility of the transmission line, which is convenient for installation and wiring, but also can resist vibration and impact to a certain extent, and improve the stability of the connection. The high temperature resistant insulating sleeve further enhances the electrical isolation effect and ensures stable insulation performance even in high temperature environments. The resistor coating is used to limit the heat generated when the current is too large to prevent overheating; while the arc extinguishing grid can quickly cut off the arc channel when the arc is generated to prevent the arc from expanding and causing damage. An arc extinguishing coating is also provided inside the resistor coating, which can quickly absorb or disperse the arc energy when the arc is generated, further reducing the damage of the arc to the surrounding environment. The sealed end cap not only protects the internal electrical components from the external environment, but also ensures the sealing of the electrical connection to prevent moisture, dust, etc. from entering. The terminal block is led out from the middle of the sealed end cap at the corresponding end, which is convenient for connection with external equipment or batteries, while maintaining the stability and safety of the connection. In the high temperature resistant insulating sleeve, the empty space in the middle of the spring-shaped transmission line is filled with insulating heat dissipation filler. This material is not only insulating, but also can absorb and disperse heat in high temperature environments, effectively reducing the internal temperature and protecting electrical components from high temperature damage.

[0007] Optionally, the elastically retractable transmission line comprises a spring-shaped transmission line.

[0008] By adopting the above technical solution, the spring-like structure also enhances the flexibility and vibration resistance of the spring-like transmission line.

[0009] Optionally, the spring-shaped transmission line includes an electric current deformation memory alloy material and is in a contracted state when a rated current is reached.

[0010] By adopting the above technical solution, the memory alloy material used in the spring-shaped transmission line will quickly change shape when subjected to high temperature or current overload, generating a strong collapse force; when a fault somewhere is blown, it can quickly collapse and pull away the fault point, avoiding the expansion of the fault range and the occurrence of fire.

[0011] Optionally, a plurality of the magnet rings are sleeved on the spring-shaped transmission line, and the magnet rings are arranged in a mutually exclusive manner with the same polarity.

[0012] By adopting the above technical solution, the magnets on the spring-shaped transmission line will generate Lorentz force by using the principle of interaction between current and magnetic field when the arc is generated. The Lorentz force will push the arc into the arc extinguishing grids on both sides, thereby realizing active control and effective suppression of the arc, and achieving a high-capacity arc extinguishing effect.

[0013] Optionally, the resistivity of the resistive coating is 2 kilo-ohms per centimeter, and the resistive coating is arranged in circular segments, with each segment being spaced 2 centimeters apart.

[0014] By adopting the above technical solution, a voltage equalizing device made of semiconductor material is set in the surrounding protective layer of the conductor, which cooperates with the arc extinguishing grid. It can play a role in uniformizing the axial voltage electric field after a fault at any location, provide a lower voltage environment for arc extinguishing, and segment the arc with the help of the arc extinguishing grid.

[0015] Optionally, the arc-extinguishing coating is formed by coating with tin dioxide gas-generating powder.

[0016] By adopting the above technical solution, the tin dioxide gas-generating powder can quickly generate gas under high temperature or electric arc to form an insulating layer, further inhibiting the diffusion and spread of the arc.

[0017] Optionally, the high temperature resistant insulating sleeve includes an outer porcelain sleeve.

[0018] By adopting the above technical solution, the outer porcelain sleeve has excellent insulation performance and high temperature resistance, which can effectively isolate the direct contact between electrical components and the external environment, further ensuring safety.

[0019] Optionally, the insulating heat dissipation filler includes ultrafine quartz sand.

[0020] By adopting the above technical solution, the main purpose of ultrafine quartz sand filling is to provide cooling, insulation and fixation of the spring-shaped transmission line. When the current is overloaded, the quartz sand can absorb heat and radiate it to the outside, thereby reducing the temperature of the spring-shaped transmission line and achieving the purpose of cooling. At the same time, quartz sand also has good insulation properties and can prevent short circuits or fires caused by electrical sparks. In addition, quartz sand can also fix the position of the spring-shaped transmission line, that is, the fuse, to prevent it from being offset or damaged during vibration or transportation.

[0021] Optionally, an inert airbag strip is provided in the spring-shaped transmission line, the inert airbag strip is distributed along the axial direction of the spring-shaped transmission line, and the insulating heat dissipation filler is also filled in the gap between the inert airbag strip and the spring-shaped transmission line.

[0022] By adopting the above technical solution, the inert airbag strip itself has a certain elastic buffering effect, combined with the use of ultra-fine quartz sand; although nitrogen itself is not a thermal insulation material, its buffering effect can reduce the internal stress concentration caused by external temperature changes, thereby extending the service life of the spring-shaped transmission line. As an inert gas, nitrogen is not easy to react chemically with other substances. When a short circuit, overheating or fire occurs, it is helpful to slow down the spread of fire.

[0023] Optionally, the elastically stretchable transmission line comprises a corrugated transmission line.

[0024] By adopting the above technical solution, the corrugated transmission line also has certain flexibility and vibration resistance.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: directly fuses at any fault position of the power busbar, and has the same arc extinguishing capability as a fuse at any position, can quickly extinguish the DC arc, and essentially plays an effective role in fire prevention. It has excellent practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of Example 1 of the present application.

[0027] Figure 2 It is a structural diagram of Example 2 of the present application.

[0028] Figure 3 It is a structural diagram of Example 2 of the present application.

[0029] Figure numerals: 1. Terminal block; 2. Sealed end cover; 3. Outer porcelain sleeve; 4. Resistor coating; 5. Arc extinguishing grid; 6. Arc extinguishing coating; 7. Spring-shaped transmission line; 8. Magnet ring; 9. Quartz sand; 10. Inert gas bag strip; 11. Corrugated transmission line. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings.

[0031] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0032] Example 1

[0033] The present application discloses a lithium battery safety connection busbar, referring to Figure 1 , including a terminal block 1, a sealing end cover 2, a high temperature resistant insulating sleeve, a resistance coating 4, an arc extinguishing grid 5, an arc extinguishing coating 6, an elastic and retractable transmission line, a magnet ring 8 and an insulating heat dissipation filler. The elastic and retractable transmission line is a spring-shaped transmission line 7.

[0034] The lithium battery safety connection busbar is a porcelain sleeve composite structure, and the outer peripheral axial sleeve of the spring-shaped transmission line 7 is provided with a high temperature resistant insulating sleeve. In this embodiment, the high temperature resistant insulating sleeve is set as an outer porcelain sleeve 3, and the outer porcelain sleeve 3 is a cylindrical tubular structure as a whole, and the thickness is generally between a few millimeters and more than ten millimeters. The specific value is determined according to the actual application field. The outer porcelain sleeve 3 has excellent insulation performance and high temperature resistance, which can effectively isolate the electrical components from direct contact with the external environment, and further ensure safety.

[0035] The inner part of the outer porcelain sleeve 3 is provided with a resistance coating 4, and the resistivity of the resistance coating 4 is 2 kilo-ohms per centimeter. The resistance coating 4 is provided in segments in a circular shape; each segment is 2 centimeters apart, and an arc extinguishing grid 5 is provided between each segment. The segmented resistance coating 4 not only limits the current size, but also provides a segmented heat dissipation effect to prevent local overheating caused by excessive current. The arc extinguishing grid 5 is provided between each segment of the resistance coating 4, which can quickly disperse the arc energy when an arc is generated, prevent the arc from continuing and expanding, and reduce the risk of short circuit and fire.

[0036] The arc-extinguishing coating 6 is arranged inside the resistance coating 4, and the arc-extinguishing coating 6 is formed by coating tin dioxide gas-generating powder. The tin dioxide gas-generating powder can quickly generate gas under high temperature or arc action to form an insulating layer, further inhibiting the diffusion and spread of the arc.

[0037] Both ends of the spring-shaped transmission line 7 are electrically connected to a terminal block 1, and the ends of the outer porcelain sleeve 3 are provided with sealed end caps 2; the terminal blocks 1 are all led out from the middle of the sealed end caps 2 at the corresponding ends. Among them, the sealed end caps 2 include a sealing structure, which can prevent external moisture, dust and other impurities from entering the interior, protect the internal electrical components from environmental influences, and improve the overall safety and durability.

[0038] The spring-shaped transmission line 7 is made of current deformation memory alloy material, and is in a contracted state when the rated current is reached. It is made of current deformation memory alloy material, and automatically contracts when the current reaches the rated current value, and can automatically cut off the current when overloaded, preventing equipment damage and safety accidents. At the same time, the spring-shaped structure also enhances the flexibility and vibration resistance of the spring-shaped transmission line 7. Among them, the memory alloy is not directly deformed by the current, but triggers its shape memory effect through temperature changes. When the rated current is reached, it can generate enough heat to make the alloy temperature reach the phase change point, thereby contracting. Among them, under normal use, when no safety failure occurs, the spring-shaped transmission line 7 can be in a natural length state or in a slightly stretched state; when the rated current is reached, the spring-shaped transmission line 7 contracts. When a certain point is blown, the spring-shaped transmission line 7 in a slightly stretched state helps to accelerate the contraction when the blow occurs, thereby further improving safety.

[0039] Titanium-nickel alloy is the most representative and widely used shape memory alloy. It has excellent shape memory effect, superelasticity and high damping properties. When titanium-nickel alloy is heated above its phase change temperature (also called critical temperature or transformation temperature), it transforms from one crystal structure (usually martensite phase) to another crystal structure (austenite phase), and this process is accompanied by changes in shape and size.

[0040] While directly shrinking titanium-nickel alloys by passing an electric current through them may not be their most straightforward application, as phase changes are usually achieved by heating, the alloy can be heated by passing an electric current to reach the phase transition temperature, thereby inducing a shape memory effect or superelastic effect, causing the alloy to shrink or return to a preset shape.

[0041] In addition, since the spring-shaped transmission line 7 is powered by direct current, the direction of the current remains unchanged in the direct current circuit, and thus the direction of the generated magnetic field is relatively stable, which means that the magnetic field around the spring-shaped transmission line 7 will maintain a relatively stable distribution state when direct current is passed through it, and will not change significantly over time.

[0042] The spring-shaped transmission line 7 is located inside the outer porcelain sleeve 3, and is sleeved with a plurality of magnet rings 8, which are arranged in a mutually exclusive manner with the same polarity. The magnet rings 8 are sleeved on the spring-shaped transmission line 7, and are arranged in a mutually exclusive manner with the same polarity. The magnet rings 8 sleeved on the spring-shaped transmission line 7 generate a Lorentz force, which forcibly repels the arc into the arc extinguishing grids 5 on both sides, thereby achieving a high-capacity arc extinguishing effect.

[0043] When current passes through the spring-shaped transmission line 7, a magnetic field is generated around the wire according to Ampere's law. The direction of this magnetic field is related to the direction of the current and the shape of the wire. Since the spring-shaped transmission line 7 has a special shape, that is, its shape is similar to a spiral spring, the generated magnetic field also presents a spring-like distribution.

[0044] Since the magnet rings 8 are arranged in a mutually exclusive arrangement with the same polarity, the magnetic fields between them will repel each other, thereby generating a magnetic field force. When current passes through the spring-shaped transmission line 7, the generated magnetic field will interact with the magnetic field of the magnet ring 8. Since the magnet rings 8 are mutually exclusive with the same polarity, the magnet rings 8 will try to move away from each other, but since they are buried in the insulating heat dissipation filler, this tendency to move away will be converted into a force on the spring-shaped transmission line 7, and the displacement generated by this tendency to move away will usually be limited to a very small range. The direction of the force depends on the direction of the magnetic field and the arrangement of the magnet rings 8. In the case of mutual repulsion with the same polarity, the force will tend to make the magnet ring 8 move axially along the spring-shaped transmission line 7. Therefore, under normal use, the magnetic field around the spring-shaped transmission line 7 will have a stable magnetic field, and under the action of the force of multiple magnet rings 8, it is more conducive to maintaining the flexibility and vibration resistance of the spring-shaped transmission line 7 under the action of external magnetic force. When melting occurs, the stability of the magnetic field on the spring-shaped transmission line 7 is destroyed. Although the spring-shaped transmission line 7 is located inside the magnet ring 8, since the magnetic field is divergent, the spring-shaped transmission line 7 will be disturbed when the spring-shaped transmission line 7 contracts, causing the spring-shaped transmission line 7 to melt more quickly, thereby improving safety.

[0045] Inside the outer porcelain sleeve 3, the empty space in the middle of the spring-shaped transmission line 7 is filled with an insulating heat dissipation filler. In this embodiment, the insulating heat dissipation filler is made of ultra-fine quartz sand 9. The ultra-fine quartz sand 9 is filled in the empty space in the middle of the spring-shaped transmission line 7 of the lithium battery, and has good heat dissipation and insulation properties, which can further improve the overall safety performance and stability. In addition, the ultra-fine quartz sand 9 is insulating. When the current does not reach the rated current, the spring-shaped transmission line 7 shrinks due to vibration or physical deformation, which is conducive to preventing the two adjacent spring-shaped rings from being electrically connected, resulting in changes in the circuit. Therefore, the provision of insulating materials for reasonable isolation is conducive to maintaining the stability of the applied circuit power supply.

[0046] The present invention sets a voltage equalizing device made of semiconductor material in the surrounding protective layer of the conductor, which cooperates with the arc extinguishing grid 5, and can play a role in uniformizing the axial voltage electric field after a fault at any location, avoiding excessive local voltage and aggravating the formation of the arc, and providing a lower voltage environment for arc extinguishing; and the arc can be segmented with the help of the arc extinguishing grid 5 to reduce the energy density and duration of the arc. Then the gas-generating medium of the arc extinguishing coating 6 can produce flame-retardant gas at the high temperature of the arc, which can not only effectively isolate oxygen, but also quickly reduce the arc temperature through physical and chemical effects, and further accelerate the extinguishing of the arc. Finally, through the magnet on the spring-shaped transmission line 7, when the arc is generated, the principle of interaction between current and magnetic field will be used to generate Lorentz force. The Lorentz force is generated to push the arc into the arc extinguishing grid 5 on both sides, thereby realizing active control and effective suppression of the arc, and realizing a high-capacity arc extinguishing effect. Therefore, not only the arc extinguishing efficiency is improved, but also the stability and reliability of the equipment in a complex electrical environment are enhanced. The memory alloy material used in the conductor will rapidly change shape and generate a strong collapse force when subjected to high temperature or current overload; when a fault somewhere is blown, it can quickly collapse and pull the fault point apart, avoiding the expansion of the fault range and the occurrence of fire. At the same time, the collapsed conductor can also provide convenience for subsequent maintenance and replacement. To further prevent fire, the present invention further fills the conductor with quartz sand 9, which not only enhances the overall insulation performance, but also provides additional cooling effect after the arc is extinguished. The high thermal conductivity and low thermal melting characteristics of quartz sand 9 enable it to quickly absorb and disperse residual heat, effectively eliminating possible residual sparks and fire hazards.

[0047] The present invention can achieve 100ms rapid arc extinguishing of a DC current of 3KA. Its arc extinguishing capability exceeds that of an air circuit breaker with the same rated current. It has excellent intrinsic safety properties and can effectively prevent fire hazards of photovoltaic, energy storage and other equipment.

[0048] Example 2

[0049] The present application embodiment discloses a lithium battery safety connection busbar, which has a structure substantially the same as that of the embodiment 1, except that:

[0050] Reference Figure 2In Example 2, an inert airbag strip 10 is additionally provided. In this embodiment, the inert airbag strip 10 is filled with nitrogen. The inert airbag strip 10 is located in the spring-shaped transmission line 7 and is distributed along the axial direction of the spring-shaped transmission line 7. In actual application, the inert airbag strip 10 can be a whole airbag, or it can be formed by connecting a plurality of long strips of airbags. At the same time, in order to ensure the stability of the structure, ultrafine quartz sand 9 is used to fill the gap, so that the inert airbag strip 10 is also buried in the ultrafine quartz sand 9. The gas-containing structure of the inert airbag strip 10 is made of high-temperature resistant material, which can withstand the temperature generated at the spring-shaped transmission line 7 within the rated current. Among them, a set gap is reserved between the outer wall of the inert airbag strip 10 and the inner wall of the cylinder formed by the spring-shaped transmission line 7.

[0051] Since the inert airbag strip 10 has a certain elastic buffering effect, combined with the use of ultra-fine quartz sand 9; although nitrogen itself is not a thermal insulation material, its buffering effect can reduce the internal stress concentration caused by external temperature changes, thereby extending the service life of the spring-shaped transmission line 7. At the same time, the filling of ultra-fine quartz sand 9 also ensures that the inert airbag strip 10 is effectively fixed and supported inside the spring-shaped transmission line 7.

[0052] As an inert gas, nitrogen is not easy to react chemically with other substances. Therefore, it can provide a layer of physical isolation from the inside when the battery short circuits, overheats or catches fire, slowing the spread of fire and reducing the risk of explosion.

[0053] Example 3

[0054] The present application embodiment discloses a lithium battery safety connection busbar, which is basically the same in structure as that of the embodiment 1, except that the structure of the elastically retractable transmission line is different:

[0055] Reference Figure 3 , the elastically stretchable transmission line is a corrugated transmission line 11.

[0056] In addition, in other embodiments, the outer porcelain sleeve 3 can also be replaced by an armored structure, and the mechanism inside the armored structure can be as described in Example 1 or Example 2.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A lithium battery safety connection busbar, characterized in that: The invention comprises a terminal block (1), a sealing end cover (2), a high temperature resistant insulating sleeve, a resistor coating (4), an arc extinguishing grid (5), an arc extinguishing coating (6), an elastic and retractable transmission line, a magnet ring (8) and an insulating heat dissipation filler; the high temperature resistant insulating sleeve is axially sleeved on the outer peripheral side of the elastic and retractable transmission line; the resistor coating (4) is arranged inside the high temperature resistant insulating sleeve, the resistor coating (4) is arranged in sections, and the arc extinguishing grid (5) is arranged between each section; the arc extinguishing coating (6) is arranged inside the resistor coating (4); both ends of the elastic and retractable transmission line are electrically connected to a terminal block ( 1), the sealed end caps (2) are arranged at the ends of the high temperature resistant insulating sleeve; the wiring blocks (1) are led out from the sealed end caps (2) at the corresponding ends; the free space in the middle of the elastic and retractable transmission line in the high temperature resistant insulating sleeve is filled with the insulating heat dissipation filler; the elastic and retractable transmission line is made of a heat shrinkable material; the elastic and retractable transmission line includes a spring-shaped transmission line (7) or a corrugated transmission line (11); a plurality of the magnet rings (8) are sleeved on the spring-shaped transmission line (7) or the corrugated transmission line (11), and the magnet rings (8) are arranged in a mutually exclusive manner with the same polarity.

2. The lithium battery safety connection busbar according to claim 1, characterized in that: The spring-shaped transmission line (7) comprises an electric current deformation memory alloy material and is in a contracted state when the rated current is reached.

3. The lithium battery safety connection busbar according to claim 1, characterized in that: The resistivity of the resistance coating (4) is 2 kilo-ohms per centimeter, and the resistance coating (4) is arranged in circular segments, with each segment being spaced 2 centimeters apart.

4. The lithium battery safety connection busbar according to claim 1, characterized in that: The arc-extinguishing coating (6) is formed by coating tin dioxide gas-generating powder.

5. The lithium battery safety connection busbar according to claim 1, characterized in that: The high temperature resistant insulating sleeve comprises an outer porcelain sleeve (3).

6. The lithium battery safety connection busbar according to claim 1 or 2, characterized in that: The insulating heat dissipation filler comprises ultra-fine quartz sand (9).

7. The lithium battery safety connection busbar according to claim 2, characterized in that: An inert gas bag strip (10) is arranged in the spring-shaped transmission line (7), and the inert gas bag strip (10) is distributed along the axial direction of the spring-shaped transmission line (7). The insulating heat dissipation filler is also filled in the gap between the inert gas bag strip (10) and the spring-shaped transmission line (7).

Images