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Recycling cell module thermistor Application

Recycling cell module thermistor Application
The present invention relates to a large current through the thermistor a reusable device and its application in the battery module. The installation
Set three-layer composite panel structure, the intermediate layer is a polymeric PTC film, both sides of the good conductivity of copper or aluminum and other flat
Plates, films and hot pressing process will be combined into one tablet whole。 And the film having a plurality of plates with the same diameter and position of the through hole,
After using insulated composite metal screws through the top and bottom plates with nut fixed。 The apparatus as in the battery module bus, the lower
Or connect with battery lug lug derived from the plate, the upper metal plate export the positive and negative poles。 The Curie temperature is the temperature of the device
Points below normal as a bus, external short circuit occurs when the battery module or other accidents resulting in output, the input current is suddenly big
When the rate of increase, the device temperature exceeds the Curie point, an increase of nearly 10,000 times the maximum resistance, effectively ensuring the safety and reliability.

1 thermistor reusable overcurrent protection device, wherein: the device is a three-layer composite slab structure,
The middle layer of polymeric positive temperature coefficient material PTC, both sides of the upper and lower metal plate, metal tablet using copper or
Aluminum plate; polymeric positive temperature coefficient PTC material to a film thickness of 0.25mm 2mm, the Curie point temperature of 80 to
Between 120 ℃, lift-drag ratio of not less than 104.
Thermistor reusable overcurrent protection device according to claim 1 2, characterized in that: the upper and lower
The thickness of the layer of metal plate is 2.5mm-6mm between the flat area of ​​the metal plate and the area PTC film the same area
4000mm2 to 90000mm2 between.
3 according to claim 1 thermistor reusable overcurrent protective device, characterized in that: hot
Pressure process will be complex three-flat, hot temperature of 90 ~ 150 ℃, the pressure is 3000-5000Pa, dwell time
5 ~ 20min.
Application thermistor reusable overcurrent protective device 4 according to claim 1, characterized in that:
In the large-capacity battery module, the battery apparatus and the underlying metal plate lug crimping upper pole derived directly as a bus
Use row, the rapid increase in resistance when overcurrent, lift-drag ratio of up to 10,000 times, since the battery module overcurrent protection role.

Thermistor overcurrent protection device and battery modules reusable application
Technology areas:
[0001] The present invention relates to a battery, in particular to large-capacity battery module thermistor overcurrent protection devices.
BACKGROUND:
[0002] Currently, the energy storage and power in the field of transport to become the new lithium-ion battery market. With the lithium-ion battery
Extend the application field of lithium ion battery cells and modules gradually from a small capacity, sent to a small capacity, the direction of mass
Exhibition, the capacity of the monomer, 5 amps or less developed to more than 1 million security, but also by the size of the battery in parallel with the development of several battery strings
Thousand of battery strings in parallel. Large capacity, large-scale lithium-ion battery applications for lithium-ion batteries has brought new opportunities for development,
But also on the lithium-ion battery safety, reliability put forward higher requirements.
[0003] Currently, the single cells connected in parallel to form a battery module generally consists of single cells, buses, housing, positive and negative output
End components. Due to the characteristics of lithium-ion batteries, battery management systems need to be used with, to avoid battery over-current, over-
Pressure to use. Small digital battery capacity typically tens of milliamperes five thousand mAh battery protection board design series PTC
Component as overtemperature overcurrent protection devices, mature applications. But in the field of energy storage and special power battery, the battery module capacity
An amount of up to several thousand when the output current of up to tens of thousands of amperes, the traditional PTC components far unable to meet the requirements. In large
Current protection areas frequently used because of the large volume of open space, causing the battery module structure is very complex, and seriously affect the
Volume of the battery module and the weight ratio of the specific energy capacity.
[0004] external short-circuit the battery, the battery module is stored, the process of using the most prone to accidents due to large output
Amplitude range over a large current may cause damage to the battery, the battery can cause serious fire or explosion.
SUMMARY OF THE INVENTION:
[0005] In order to solve large-capacity battery module disadvantage of low safety factor, the present invention provides a battery module that can be used
The bus has a thermistor functions within the device. Characterized in that the battery module must use the bus with hot
Functions and features sensitive resistors, no additional large external battery modules in series volume, complex circuit breaker protection
Means for troubleshooting the battery short circuit, the temperature decreases, the battery module can continue to be used without the need for replacement and
Maintenance。 The battery module has a simple structure, reliable performance, easy maintenance features, and fully guarantee the battery in unexpectedly large currents
Such as security and reliability of the output of external short circuit of the battery module.
[0006] To achieve the above object, the present invention provides technical solutions to solve the technical problem is to provide the use of a
Bus device has a thermistor functions and features, the device consists of a metal plate and polymeric PTC film composition.
[0007] The present invention provides a reusable thermistor overcurrent protective device, characterized in that: the means of three
Layer composite slab structure, the middle layer of polymeric positive temperature coefficient material PTC, both sides of the upper and lower metal plate, metal
Copper or aluminum flat tablet used; polymeric positive temperature coefficient PTC material film thickness of 0.25mm to 2mm, ranking
Point where the temperature between 80 and 120 ℃, lift-drag ratio of not less than 104.
[0008] Further, characterized in that: the thickness of the upper and lower metal plates is between 2.5mm-6mm, flat metal plate
PTC film surface area and the area is the same area between 4000mm2 to 90000mm2.
[0009] Further, characterized in that: the use of hot-pressing process will be complex three-flat, hot temperature of 90 ~
150 ℃, the pressure is 3000-5000Pa, dwell time is 5 ~ 20min.
[0010] The overcurrent protection device using a thermal resistance of said reusable, characterized in that: the large-capacity battery
Module, the lower metal plate and the battery apparatus lug crimping upper pole derived directly used as a bus, in the past
Stream resistance rises rapidly, the highest lift-drag ratio of 10,000 times, since the battery module overcurrent protection role.
[0011] The battery module of the device as a bus electrode tabs are connected to the lower metal plate to the battery, the upper metal plate leads
Battery module output pole connected with the construction of the external load, the battery module output significantly exceeds the predetermined range of current, the
Device temperature exceeds the Curie point, the resistance increases significantly, resulting in a current drop. Solve the battery in the external short circuit intended
External output, input requirements of a large range of current, battery temperature cause the battery to get hurt, or even fire explosion
Dangerous problem. After exclusion of the accident, the device temperature decreases, the bus may continue as normal, without the need for maintenance
Or replacement.
Brief Description
[0012] Figure 1 a schematic diagram of the overcurrent protection plate
[0013] Figure 2 graphs stability test
[0014] Figure 3 a schematic view of the cell
[0015] Figure 4 Schematic battery module
[0016] Figure 50.1mΩ circuit test short circuit graph
[0017] Figure 6 of the battery module discharge curves different magnifications
Embodiment
[0018] two metal plates on the plate A and the lower plate B, flat open several vias. PTC polymeric film surface
The metal plate is equal to the plot, the position of the metal plate with the same, the same hole diameter through hole.
[0019] The PTC polymer film is placed between two metal plates, the two sides of the metal thin plate and the PTC,
Corresponding to the through-hole is formed sandwich-like structure shown in Figure 1. In a hot press heated to 90-150 ℃, pressure is
3000-5000Pa, a pressure holding time is 5-20min, complete composite, a metal plate is formed as two layers, an intermediate polymer
Integral structure of the PTC material. The press releasing the pressure after cooling the composite flat out, with a screw through the insulated
The composite flat locked.
[0020] described below in conjunction with the accompanying drawings of the preferred embodiment of the present invention.
[0021] Example 1: Figure 1 is a bus structure with a thermistor device functions and features of the diagram in Figure 1 implementation
Embodiment illustrated, the apparatus comprising:
[0022] two copper plates, the plate A and the lower plate B, each having a thickness of 2.5mm, polymeric PTC film thickness
Is 0。3mm, Curie point of 85 ℃, lift-drag ratio of not less than 104 by the Keter Limited。 Tablet A and B,
PTC film has two threaded through-holes. Down flat shape for the 20 * 250 * 2.5mm (W * L * H), PTC film appearance was
20 * 250 * 0.3mm (W * L * H), the aperture angle of the thread is 4mm.
[0023] The PTC polymer film is placed between two metal plates, the two flat sides of the PTC film, and four holes
Relatively homogeneous. Maintain a fixed position, placed on the lower plate of the pressing machine and set the stroke set at two press tablet pressing machine at
Bit block, so that the overall thickness of the press pressure of not less than three-layer composite of 5。25mm。 In a hot press heated to 120 ℃, pressure setting
Set to 3000Pa,. After the temperature reached the start pressure, the pressure hold 5min.
[0024] releasing the pressure after cooling, the composite plate is removed, the insulating screw threaded through the through holes of the four composite
Flat locked. Formation of two layers of copper, one of the middle class sandwich structure of the polymer PTC material.
[0025] Example 2:
[0026] two copper plates, the plate A and the lower plate B, each having a thickness of 3mm, polymeric PTC film thickness
0.3mm, Curie point is 90 ℃, lift-drag ratio of not less than 104 by the Keter Limited. Tablet A and B,
PTC film has four threaded through holes。 The shape of the plate 100 * 100 * 3mm (W * L * H), PTC film shape for the
100 * 100 * 0.3mm (W * L * H), thread diameter is 6mm.
[0027] The PTC polymer film is placed between two metal plates, the two flat sides of the PTC film, and four holes
Relatively homogeneous. Maintain a fixed position, placed on the lower plate of the pressing machine and set the stroke set at two press tablet pressing machine at
Bit block, so that the overall thickness of the press pressure of not less than three-layer composite of 6。25mm。 In a hot press heated to 125 ℃, pressure setting
Set to 3500Pa,. After the temperature reached the start pressure, the pressure hold 5min.
[0028] releasing the pressure after cooling the composite flat out, with insulating screw threaded through the holes of the four composite flat
Board locked。 Formation of two layers of copper, one of the middle class sandwich structure of the polymer PTC material.
[0029] Example 3:
[0030] two copper plates, the plate A and the lower plate B, each having a thickness of 4mm, polymeric PTC film thickness
Is 0.3mm, Curie point of 85 ℃, lift-drag ratio of not less than 104 by the Keter Limited. A flat
And B, PTC film has four threaded through holes, and has a through hole 20 having a diameter of 12。 Flat shape of the upper and lower
300 * 300 * 4mm (W * L * H), PTC film appearance as 300 * 300 * 0.3mm (W * L * H), a threaded aperture of 8mm.
[0031] The PTC polymer film is placed between two metal plates, the two flat sides of the PTC film, and four holes
Relatively homogeneous. Maintain a fixed position, placed on the lower plate of the pressing machine and set the stroke set at two press tablet pressing machine at
Bit block, so that the overall thickness of the press pressure of not less than three-layer composite of 8.25mm. In a hot press heated to 135 ℃, pressure setting
Set to 4000Pa,. After the temperature reached the start pressure, the pressure keeping 10min.
[0032] releasing the pressure after cooling the composite flat out, with insulating screw threaded through the holes of the four composite flat
Board locked。 Formation of two layers of copper, one of the middle class sandwich structure of the polymer PTC material.
[0033] The compound prepared in Example 1, 2-liter flat-drag ratio performance tests conducted preferred embodiment, shown as follows.
[0034] Table 1 lift-drag ratio performance test table
[0035]
Type 25 ℃ 55 ℃ resistance resistance resistance 120 ℃ lift to drag ratio
Example 1 0.942mΩ 1.265mΩ 3895.2mΩ 4125
Example 2 0.610mΩ 0.805mΩ 1495.1mΩ 2450
Example 3 0.051mΩ 0.072mΩ 129.1mΩ 2531
[0036] Figure 2 is made to Example 3 Comparative test data 500 FIG embodiment, the vertical axis is the resistance unit is uΩ, abscissa
The number of tests, test conditions at room temperature。 Curve B in Figure 2 is the resistance value when the current through 4000A graph, temperature stability
At between 32-35 ℃, curve A is the resistance value of the current through 16000A, the temperature reaches 120 degrees Celsius as measured resistance
Value. This can be seen in the test range 500, and the room temperature resistance value of the resistor 120 ℃ relatively stable basic lift-drag ratio
No change.
[0037] Example 4:
Example 3 in the battery module application diagram [0038] Below is implemented:
[0039] a combination of four cell 500Ah battery cells together. Wherein the cell by way of crimping the upper and lower
The battery cells in parallel copper, fixed by screws passing through the copper, shown in Figure 3. 5 the bottom of the cell diameter of the screw
Of 10mm, an outer diameter of the screw cap 11mm, a height of 8mm, thickness of 1mm and bus do Teflon tube insulation.
After four cells contained in the enclosure, in Example 3 the screw through the through-hole embodiment of the system bus, additional insulation spacer, with screw
Female lock after completion of the cell parallel form 8000Ah cell module shown in Figure 4.
[0040] battery module 0.1mΩ short circuit test is done, the battery short-circuit current rapid decline, down to 10 since the beginning of
100 amps or less, the battery module stabilized, and the process no venting, no fire, no explosion, short-circuit current curve shown in Figure 5
Shown. Where the vertical axis is the current in amperes, the abscissa is the time in minutes.
After the [0041] Short-circuit test, the temperature returns to room temperature battery module 0.2I10, 1I10, 2I10, 5I10, 10I10 (I10 to
800A) capable of stable discharge current of the discharge, the discharge curve shown in Figure 6.
[0042] Thermistor reusable apparatus of the present invention as a battery module bus does not affect the battery modules
Block to normal output performance while addressing the battery module output range specified in unexpectedly large external short circuit current conduction
Induced cell injury, fire or even explosion hazard problem.


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