CN209119865U - A kind of multi-series lithium battery hardware short-circuit protection circuit - Google Patents
A kind of multi-series lithium battery hardware short-circuit protection circuit Download PDFInfo
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- CN209119865U CN209119865U CN201822236547.8U CN201822236547U CN209119865U CN 209119865 U CN209119865 U CN 209119865U CN 201822236547 U CN201822236547 U CN 201822236547U CN 209119865 U CN209119865 U CN 209119865U
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Abstract
The utility model provides a kind of multi-series lithium battery hardware short-circuit protection circuit, utilize the electric current and output voltage signal of electric current monitor detection current loop, when short circuit occurs for the charge or discharge process of current loop, charging current or discharge current are excessive, electric current monitor output voltage is more than the reference voltage of voltage comparator setting, the control S/R latch output of voltage comparator output voltage signal can latch the reverse voltage signal of holding to the control terminal of driving circuit, it controls driving circuit and turns off metal-oxide-semiconductor, and then turn-off current circuit, play electric current it is excessive when protective effect, because circuit is designed using pure hardware circuit element, response time is up to microsecond rank, short-circuit abnormality can be reacted in time, quick response simultaneously cuts off current loop in time, reach the not impaired purpose of protection element and lithium battery, securely and reliably.
Description
Technical field
The utility model relates to battery short circuit protection technique field more particularly to a kind of multi-series lithium battery hardware short-circuit protections
Circuit.
Background technique
Currently, the voltage of multi-series lithium battery is high, capacity is big, and external short circuit immediate current is very big, generally several hundred amperes,
Even upper kiloampere, integrated protection chip are responded too late in the short-circuit state due to being laid out distance or driving capability
When or when shielding failure, it is easy to cause protection board component wear, or even damage battery core, cause safety accident.Therefore, in order to anti-
Only occur the safety accidents such as element or battery core damage in the short-circuit state, needs a kind of independent hardware short-circuit protection circuit, come
Quick response simultaneously cuts off current loop in time, plays a protective role.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of multi-series lithium battery hardware short circuits
Circuit is protected, solves protection chip integrated in the prior art due to being laid out distance or driving capability, in short-circuit shape
It is responded under state not in time or when shielding failure, it is easy to cause protection board component wear, or even damage battery core, cause safety accident
The problem of.
The utility model provides a kind of multi-series lithium battery hardware short-circuit protection circuit, including current detection circuit, electric current ratio
Compared with circuit, control circuit；Wherein,
The current detection circuit includes sampling resistor, current sampling circuit, and the current comparison circuit includes voltage ratio
Compared with device, divider resistance, the control circuit includes latch circuit, driving circuit, metal-oxide-semiconductor；
The sampling resistor is connected between the cathode of single lithium battery and the cathode of the battery pack of multi-series lithium battery composition,
The input terminal of the current sampling circuit is connect with the sampling resistor, the output end of the current sampling circuit and the voltage
One input terminal of comparator connects, and another input terminal of the voltage comparator is connected by the divider resistance and reference voltage
It connects, the output end of the voltage comparator is connect with the input terminal of the latch circuit, the output end of the latch circuit
It is connect with the input terminal of the driving circuit, the output end of the driving circuit is connect with the grid of the metal-oxide-semiconductor, the MOS
Pipe is connected between the cathode of the battery pack and the output end of current loop.
Further, the current sampling circuit includes electric current monitor, common mode sample circuit, the electric current monitor
Positive input terminal, negative input end are connect by the common mode sample circuit with the sampling resistor, the power supply of the electric current monitor
End connect with working power, the reference voltage end of the electric current monitor is connect with reference voltage, the electric current monitor it is defeated
Outlet is connect with an input terminal of the voltage comparator.
Further, the voltage comparator is twin voltage comparator, and the divider resistance includes the first divider resistance, the
Two divider resistances, third divider resistance, the positive input terminal of the first voltage comparator of the twin voltage comparator pass through described the
One divider resistance accesses working power, and the negative input end of the first voltage comparator and the output end of the electric current monitor connect
It connects, the positive input terminal of the second voltage comparator of the twin voltage comparator is connect with the output end of the electric current monitor, institute
The negative input end for stating second voltage comparator is connect by second divider resistance with first divider resistance, and passes through institute
State third divider resistance ground connection.
Further, the current comparison circuit further include be made of first diode and the second diode with door electricity
Road, the cathode of the first diode are connect with the output end of the first voltage comparator, the cathode of second diode
Connect with the output end of the second voltage comparator, positive, described second diode of the first diode anode with
The latch circuit connection.
Further, the latch circuit includes the S/R latches of double NAND gate chips compositions, the first pull-up resistor, the
Two pull-up resistors, the anode for setting 0 input terminal Yu the first diode of the first NAND gate chip of double NAND gate chips
Connection, and working power is accessed by first pull-up resistor, the first NAND gate chip sets 1 input terminal and the drive
The control terminal connection of dynamic circuit, the power end of the first NAND gate chip are connect with working power, the first NAND gate core
The output end of piece is connect with 0 input terminal of setting of the second NAND gate chip of double NAND gate chips, the second NAND gate core
1 input terminal of setting of piece accesses working power, the output end of the second NAND gate chip and institute by second pull-up resistor
State the control terminal connection of driving circuit.
Further, the control terminal of the driving circuit includes the first control terminal and the second control terminal, the driving circuit
The first control terminal connect with 1 input terminal of setting of the first NAND gate chip, the second control terminal of the driving circuit and described the
The output end of two NAND gate chips connects.
Further, the metal-oxide-semiconductor include the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor with it is described
First output end of driving circuit connects, and the grid of second metal-oxide-semiconductor is connect with the second output terminal of the driving circuit.
Further, first metal-oxide-semiconductor and second metal-oxide-semiconductor are N-type metal-oxide-semiconductor, the source electrode of first metal-oxide-semiconductor
It being connect with the cathode of the battery pack, the drain electrode of first metal-oxide-semiconductor is connect with the drain electrode of second metal-oxide-semiconductor, and described second
The source electrode of metal-oxide-semiconductor accesses the output end of the current loop.
It further, further include controller, the first of the output end of the first NAND gate chip and the controller is defeated
Enter end connection, 1 input terminal of setting of the second NAND gate chip is connect with the second input terminal of the controller.
Further, the latch circuit further includes third diode and the 4th diode, the first NAND gate core
1 input terminal of setting of piece is connect with the cathode of the third diode, anode and the driving circuit of the third diode
The connection of first control terminal, the output end of the second NAND gate chip are connect with the cathode of the 4th diode, and the described 4th
The anode of diode is connect with the second control terminal of the driving circuit.
Compared with prior art, the utility model has the beneficial effects that:
The utility model provides a kind of multi-series lithium battery hardware short-circuit protection circuit, is returned using electric current monitor detection electric current
The electric current and output voltage signal on road, when short circuit occurs for the charge or discharge process of current loop, charging current or electric discharge electricity
Flow through big, reference voltage of the electric current monitor output voltage more than voltage comparator setting, voltage comparator output voltage signal
Control S/R latch output can latch control terminal of the reverse voltage signal kept to driving circuit, control driving circuit shutdown
Metal-oxide-semiconductor, and then turn-off current circuit, play electric current it is excessive when protective effect, because circuit using pure hardware circuit element design,
Response time up to microsecond rank, can in time react short-circuit abnormality, and quick response simultaneously cuts off current loop in time,
Reach the not impaired purpose of protection element and lithium battery, securely and reliably.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail
It describes in detail bright as after.Specific embodiment of the present utility model is shown in detail by following embodiment and its attached drawing.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings:
Fig. 1 is a kind of multi-series lithium battery hardware short-circuit protection circuit circuit diagram of the utility model.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
A kind of multi-series lithium battery hardware short-circuit protection circuit, as shown in Figure 1, more electric including current detection circuit, electric current
Road, control circuit；Wherein,
Current detection circuit includes sampling resistor RS1, current sampling circuit, current comparison circuit include voltage comparator,
Divider resistance, control circuit include latch circuit, driving circuit, metal-oxide-semiconductor；
The battery pack that sampling resistor RS1 is connected on the cathode Battery- of single lithium battery and multi-series lithium battery forms is born
Between the Pack- of pole, the input terminal of current sampling circuit is connect with sampling resistor RS1, the output end and voltage of current sampling circuit
One input terminal of comparator connects, and another input terminal of voltage comparator is connect by divider resistance with reference voltage, voltage ratio
It is connected compared with the output end of device and the input terminal of latch circuit, the output end of latch circuit and the input terminal of driving circuit connect
It connects, the grid of the output end of driving circuit and metal-oxide-semiconductor connects, and metal-oxide-semiconductor is connected on the cathode Pack- and current loop of battery pack
Between output end Output-.
As shown in Figure 1, it is preferred that current sampling circuit includes electric current monitor U1, common mode sample circuit, common mode sampling electricity
R1, R2, C1 composition are routed, the positive input terminal of electric current monitor U1 passes through the one of the R1 and sampling resistor RS1 of common mode sample circuit
The negative input end of end connection, electric current monitor U1 is connect by the R2 of common mode sample circuit with the other end of sampling resistor RS1, C1
It connects between the positive input terminal and negative input end of electric current monitor U1, the power end and working power VCC of electric current monitor U1 connects
It connects, the reference voltage end of electric current monitor U1 is connect with reference voltage VREF, and the output end of electric current monitor U1 is compared with voltage
One input terminal of device connects, and current sampling circuit further includes filter capacitor C2, C3, C4, and filter capacitor C2 connects in electric current monitor
Power end and working power VCC between, the reference voltage end and base of an end Jie electric current monitor U1 of filter capacitor C3, C4
Between quasi- voltage VREF, the other end of filter capacitor C3, C4 are grounded.In the present embodiment, the output voltage Uo of electric current monitor U1
=UVREF+n* (Usnsp-Usnsn), UVREF are the input reference voltage of electric current monitor U1, and n is the increasing of electric current monitor U1
Beneficial multiple, Usnsp and Usnsn are the voltage of sampling resistor RS1 two-end-point, and VCC is the work constant voltage of U.In the present embodiment,
Including but not limited to electric current monitor U1 can also be realized by the feedback amplifier being made of operational amplifier.
As shown in Figure 1, it is preferred that voltage comparator be twin voltage comparator, divider resistance include the first divider resistance R5,
Second divider resistance R6, third divider resistance R7, the positive input terminal of the first voltage comparator U2A of twin voltage comparator pass through the
One divider resistance R5 accesses working power VCC, and the power end of first voltage comparator U2A is connect with working power VCC, the first electricity
The negative input end of pressure comparator U2A is connect with the output end of electric current monitor U1, the second voltage comparator of twin voltage comparator
The positive input terminal of U2B is connect with the output end of electric current monitor U1, and the negative input end of second voltage comparator U2B passes through second point
Piezoresistance R6 is connect with the first divider resistance R5, and by third divider resistance R7 be grounded, current comparison circuit further include by R3,
The input signal filter element of C5 composition and input signal filter element, the filter capacitor C7 being made of R4, C6, first voltage ratio
Negative input end compared with device U2A is connect by resistance R3 with the output end of electric current monitor U1, and capacitor C5 connects in resistance R3 and first
It between the negative input end of voltage comparator U2A, and is grounded, the positive input terminal of second voltage comparator U2B passes through resistance R4 and electricity
The output end of monitor for flowing U1 connects, and capacitor C6 connects between resistance R4 and the positive input terminal of second voltage comparator U2B, and connects
Ground, filter capacitor C7 connects between the power end and working power VCC of first voltage comparator U2A, and is grounded.The present embodiment
In, Ua and Ub pass through the first voltage comparator U2A and second voltage comparator that tri- electric resistance partial pressures of R5, R6, R7 obtain for VCC
The reference voltage of U2B, specifically, Ua is the positive input terminal reference voltage of first voltage comparator U2A, Ub compares for second voltage
The negative input end reference voltage of device U2B, Uc are first voltage comparator U2A and second voltage comparator U2B output voltage signal
Via the voltage signal after the logical AND gate of D1, D2 composition.
In one embodiment, it is preferred that current comparison circuit further includes by first diode D1 and the second diode D2 group
At AND gate circuit, the cathode of first diode D1 connect with the output end of first voltage comparator U2A, the second diode D2's
Cathode is connect with the output end of second voltage comparator U2B, anode and the lock of the anode of first diode D1, the second diode D2
Latch circuit connection.
As shown in Figure 1, it is preferred that latch circuit includes the S/R latch of double NAND gate chip compositions, the first pull-up electricity
R8, the second pull-up resistor R9 are hindered, the first NAND gate chip U3A's of double NAND gate chips sets 0 input terminal and first diode D1
Anode connection, and by the first pull-up resistor R8 access working power VCC, the first NAND gate chip U3A set 1 input terminal with
The control terminal of driving circuit connects, and the power end of the first NAND gate chip U3A is connect with working power VCC, the first NAND gate core
The output end of piece U3A is connect with 0 input terminal of setting of the second NAND gate chip U3B of double NAND gate chips, the second NAND gate chip
1 input terminal of setting of U3B accesses working power VCC, the output end of the second NAND gate chip U3B and drive by the second pull-up resistor R9
The control terminal connection of dynamic circuit.In the present embodiment, the S/R latch of including but not limited to double NAND gate chip compositions can also pass through
Dedicated S/R latch chip is realized.
As shown in Figure 1, it is preferred that the control terminal of driving circuit includes the first control terminal CHGOFF and the second control terminal
DSGOFF, the first control terminal CHGOFF of driving circuit are connect with 1 input terminal of setting of the first NAND gate chip U3A, driving circuit
The second control terminal DSGOFF connect with the output end of the second NAND gate chip U3A.Preferably, metal-oxide-semiconductor includes the first metal-oxide-semiconductor
First output end MOS1OFF connection of the grid and driving circuit of MOS1 and the second metal-oxide-semiconductor MOS2, the first metal-oxide-semiconductor MOS1, second
The second output terminal MOS2OFF connection of the grid and driving circuit of metal-oxide-semiconductor MOS2.Preferably, the first metal-oxide-semiconductor MOS1 and second
Metal-oxide-semiconductor MOS2 is N-type metal-oxide-semiconductor, the source electrode of the first metal-oxide-semiconductor MOS1 and the cathode Pack- connection of battery pack, the first metal-oxide-semiconductor
The drain electrode of MOS1 is connect with the drain electrode of the second metal-oxide-semiconductor MOS2, the output end of the source electrode access current loop of the second metal-oxide-semiconductor MOS2
Output-。
As shown in Figure 1, latch circuit further includes filter capacitor C8, third diode D3 and the 4th diode D4, third
For protecting S/R latch and driving circuit, filter capacitor C8 connects in the first NAND gate chip diode D3 and the 4th diode D4
Between the power end and ground of U3A, 1 input terminal of setting of the first NAND gate chip U3A is connect with the cathode of third diode D3, third
The anode of diode D3 is connect with the first control terminal CHGOFF of driving circuit, the output end of the second NAND gate chip U3B and the
The cathode of four diode D4 connects, and the anode of the 4th diode D4 connect DSGOFF with the second control terminal of driving circuit.
In one embodiment, it is preferred that it further include controller, the output end of the first NAND gate chip U3A and controller
First input end SCEVENT connection, the second input terminal for setting 1 input terminal and controller of the second NAND gate chip U3B
SCRLEASE connection.
The working principle of multi-series lithium battery hardware short-circuit protection circuit are as follows: under normal circumstances, Uo is greater than Ub and is less than Ua, the
The equal output high level voltage signal of one voltage comparator U2A and second voltage comparator U2B, the logical AND formed via D1, D2
Voltage signal Uc behind the door is high level voltage signal, i.e. the first NAND gate chip U3A's sets 1 input terminal Us and the second NAND gate
To remain high level voltage signal constant by the 0 input terminal Ur that sets of chip U3B, so S/R latch initial state output end Uq is due to connection
To the first control terminal CHGOFF and the second control terminal DSGOFF of driving circuit, so high level voltage signal is kept, because of this
It is constant that state output end Uq1 remains low level voltage signal, i.e. the first control terminal CHGOFF and the second control terminal DSGOFF are kept
High level signal, the signal that driving circuit is output to the control terminal MOS1OFF and MOS2OFF of MOS1 and MOS2 is high level,
MOS1, MOS2 are on state, are connected again to the current loop of Output- from Battery- to Pack-, and the first of controller is defeated
Enter to hold SCEVENT to keep low level voltage signal, will not occur to protect control action；By adjusting sampling resistor RS1 resistance value
Size, the size of electric current monitor U1 gain factor n, the size of electric current monitor U1 input reference voltage VREF, and partial pressure
The size of resistance R5, R6, R7 resistance value is charged and discharged the size of short circuit current protection threshold value to adjust；
Under charged state, current direction is to flow to the end Pack- from the end Battery- through RS1, and RS1 both end voltage Usnsp is big
In Usnsn, show that Usnsp-Usnsn is bigger when charging current is bigger by the calculation formula of above-mentioned output voltage Uo, i.e., Uo is got over
Greatly, when Uo increases above the reference voltage Ua that first voltage comparator U2A positive input terminal is divided by R5, R6, R7, the
One voltage comparator U2A exports low level voltage signal, becomes low via the voltage signal Uc after the logical AND gate of D1, D2 composition
The 0 input terminal Ur that sets of level voltage signal, i.e. the second NAND gate chip U3B becomes low level voltage signal, the first NAND gate core
The 1 input terminal Us that sets of piece U3A remains that high level voltage signal is constant, by the characteristic of S/R latch it is found that S/R latch at this time
Next state output end Uq1 become high level voltage signal, and the initial state output end Uq of S/R latch becomes low level voltage signal,
It is learnt by the signal of first input end SCEVEN and guard mode has occurred at this time, be attached to the first control terminal of driving circuit
CHGOFF, the second control terminal DSGOFF signal become low level, driving circuit is output to the control terminal of MOS1 and MOS2
The signal of MOS1OFF and MOS2OFF be low level, MOS1, MOS2 be off-state, from Battery- to Pack- again to
The current loop of Output- disconnects, and plays a protective role, and after MOS1, MOS2 shutdown, since loop current becomes 0,
The state of electric current monitor U1 and twin voltage comparator is restored to 2 normal conditions, i.e. S/R latch is set 1 input terminal Us and set
0 input terminal Ur protection is high level voltage signal, plays the constant effect of the current protection output state of locking；
Under discharge condition, current direction is to flow to the end Battery- from the end Pack- through RS1, and RS1 both end voltage Usnsp is small
In Usnsn, show that Usnsp-Usnsn is smaller when discharge current is bigger by the calculation formula of above-mentioned output voltage Uo, i.e., Uo is got over
It is small, when Uo is decreased below the reference voltage Ub that second voltage comparator U2B negative input end is divided by R5, R6, R7, the
Two voltage comparator U2B export low level voltage signal, become low via the voltage signal Uc after the logical AND gate of D1, D2 composition
The 0 input terminal Ur that sets of level voltage signal, i.e. S/R latch becomes low level voltage signal, sets 1 input terminal Us and remains high electricity
Flat voltage signal is constant, from the characteristic of S/R latch it is found that the next state output end Uq1 of S/R latch becomes high level voltage at this time
Signal is learnt by the signal of first input end SCEVEN and guard mode has occurred at this time, and the initial state output end of S/R latch
Uq becomes low level voltage signal, is attached to the first control terminal CHGOFF of driving circuit, the letter of the second control terminal DSGOFF
Number becoming low level, the signal that driving circuit is output to the control terminal MOS1OFF and MOS2OFF of MOS1 and MOS2 is low level,
MOS1, MOS2 are off-state, disconnect, play a protective role to the current loop of Output- again from Battery- to Pack-,
And after circuit MOS1, MOS2 shutdown, since loop current becomes 0, the shape of electric current monitor U1 and twin voltage comparator
State is restored to 2 normal conditions, i.e., S/R latch to set 1 input terminal Us and set 0 input terminal Ur protection be high level voltage signal,
Play the constant effect of the current protection output state of locking；
When S/R latch is in guard mode, i.e. the next state output end Uq1 of S/R latch is high level voltage signal, just
When state output end Uq is low level, by the second input terminal SCRLEASE input low level voltage signal, i.e., to S/R latch
It sets 1 input terminal Us and low level signal is provided, by the characteristic of S/R latch it is found that the initial state output end of S/R latch is restored at this time
The signal of high level voltage signal, the first control terminal CHGOFF, the second control terminal DSGOFF that are attached to driving circuit becomes
High level, control driving circuit reopens MOS1, MOS2, restores output, and next state output end Uq1 is restored to low level voltage
Signal learns that guard mode is recovered at this time by first input end SCEVEN.
The utility model provides a kind of multi-series lithium battery hardware short-circuit protection circuit, is returned using electric current monitor detection electric current
The electric current and output voltage signal on road, when short circuit occurs for the charge or discharge process of current loop, charging current or electric discharge electricity
Flow through big, reference voltage of the electric current monitor output voltage more than voltage comparator setting, voltage comparator output voltage signal
Control S/R latch output can latch control terminal of the reverse voltage signal kept to driving circuit, control driving circuit shutdown
Metal-oxide-semiconductor, and then turn-off current circuit, play electric current it is excessive when protective effect, because circuit using pure hardware circuit element design,
Response time up to microsecond rank, can in time react short-circuit abnormality, and quick response simultaneously cuts off current loop in time,
Reach the not impaired purpose of protection element and lithium battery, securely and reliably.
More than, the only preferred embodiment of the utility model not makees limit in any form to the utility model
System；The those of ordinary skill of all industry can be shown in by specification attached drawing and above and swimmingly implement the utility model；But
It is that all those skilled in the art are not departing within the scope of technical solutions of the utility model, utilizes disclosed above skill
Art content and the equivalent variations of a little variation, modification and evolution made, are the equivalent embodiment of the utility model；Meanwhile
The variation, modification and evolution etc. of all substantial technological any equivalent variationss to the above embodiments according to the utility model,
Within the protection scope for still falling within the technical solution of the utility model.
Claims (10)
1. a kind of multi-series lithium battery hardware short-circuit protection circuit, it is characterised in that: more electric including current detection circuit, electric current
Road, control circuit；Wherein,
The current detection circuit includes sampling resistor, current sampling circuit, the current comparison circuit include voltage comparator,
Divider resistance, the control circuit include latch circuit, driving circuit, metal-oxide-semiconductor；
The sampling resistor is connected between the cathode of single lithium battery and the cathode of the battery pack of multi-series lithium battery composition, described
The input terminal of current sampling circuit is connect with the sampling resistor, and the output end of the current sampling circuit is compared with the voltage
One input terminal of device connects, and another input terminal of the voltage comparator is connect by the divider resistance with reference voltage, institute
The output end for stating voltage comparator is connect with the input terminal of the latch circuit, the output end of the latch circuit with it is described
The input terminal of driving circuit connects, and the output end of the driving circuit is connect with the grid of the metal-oxide-semiconductor, the metal-oxide-semiconductor series connection
Between the cathode of the battery pack and the output end of current loop.
2. a kind of multi-series lithium battery hardware short-circuit protection circuit as described in claim 1, it is characterised in that: the current sample
Circuit includes electric current monitor, common mode sample circuit, and positive input terminal, the negative input end of the electric current monitor pass through the common mode
Sample circuit is connect with the sampling resistor, and the power end of the electric current monitor is connect with working power, the current monitoring
The reference voltage end of device is connect with reference voltage, an input terminal of the output end of the electric current monitor and the voltage comparator
Connection.
3. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 2, it is characterised in that: the voltage compares
Device is twin voltage comparator, and the divider resistance includes the first divider resistance, the second divider resistance, third divider resistance, described
The positive input terminal of the first voltage comparator of twin voltage comparator accesses working power by first divider resistance, and described the
The negative input end of one voltage comparator is connect with the output end of the electric current monitor, the second voltage of the twin voltage comparator
The positive input terminal of comparator is connect with the output end of the electric current monitor, and the negative input end of the second voltage comparator passes through
Second divider resistance is connect with first divider resistance, and is grounded by the third divider resistance.
4. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 3, it is characterised in that: the electric current compares
Circuit further includes the AND gate circuit being made of first diode and the second diode, the cathode of the first diode and described the
The output end of one voltage comparator connects, and the output end of the cathode of second diode and the second voltage comparator connects
It connects, the anode of positive, described second diode of the first diode is connect with the latch circuit.
5. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 4, it is characterised in that: the latch electricity
Road includes S/R latch, the first pull-up resistor, the second pull-up resistor of double NAND gate chip compositions, double NAND gate chips
0 input terminal of setting of first NAND gate chip is connect with the anode of the first diode, and is connect by first pull-up resistor
Enter working power, 1 input terminal of setting of the first NAND gate chip is connect with the control terminal of the driving circuit, described first with
The power end of NOT gate chip is connect with working power, the output end of the first NAND gate chip and double NAND gate chips
Second NAND gate chip sets the connection of 0 input terminal, and 1 input terminal of setting of the second NAND gate chip passes through the second pull-up electricity
Resistance access working power, the output end of the second NAND gate chip are connect with the control terminal of the driving circuit.
6. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 5, it is characterised in that: the driving circuit
Control terminal include the first control terminal and the second control terminal, the first control terminal of the driving circuit and the first NAND gate chip
The connection of 1 input terminal is set, the second control terminal of the driving circuit is connect with the output end of the second NAND gate chip.
7. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 6, it is characterised in that: the metal-oxide-semiconductor packet
The first metal-oxide-semiconductor and the second metal-oxide-semiconductor are included, the grid of first metal-oxide-semiconductor is connect with the first output end of the driving circuit, described
The grid of second metal-oxide-semiconductor is connect with the second output terminal of the driving circuit.
8. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 7, it is characterised in that: the first MOS
Pipe and second metal-oxide-semiconductor are N-type metal-oxide-semiconductor, and the source electrode of first metal-oxide-semiconductor is connect with the cathode of the battery pack, described
The drain electrode of first metal-oxide-semiconductor is connect with the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor accesses the current loop
Output end.
9. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 5, it is characterised in that: further include control
The output end of device, the first NAND gate chip is connect with the first input end of the controller, the second NAND gate chip
1 input terminal of setting connect with the second input terminal of the controller.
10. a kind of multi-series lithium battery hardware short-circuit protection circuit as claimed in claim 6, it is characterised in that: the latch
Circuit further includes third diode and the 4th diode, and the first NAND gate chip sets 1 input terminal and the three or two pole
The cathode of pipe connects, and the anode of the third diode is connect with the first control terminal of the driving circuit, described second with it is non-
The output end of door chip is connect with the cathode of the 4th diode, anode and the driving circuit of the 4th diode
The connection of second control terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236547.8U CN209119865U (en) | 2018-12-28 | 2018-12-28 | A kind of multi-series lithium battery hardware short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236547.8U CN209119865U (en) | 2018-12-28 | 2018-12-28 | A kind of multi-series lithium battery hardware short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209119865U true CN209119865U (en) | 2019-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822236547.8U Active CN209119865U (en) | 2018-12-28 | 2018-12-28 | A kind of multi-series lithium battery hardware short-circuit protection circuit |
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| CN (1) | CN209119865U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946491A (en) * | 2021-01-22 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Device and method for testing safety of ternary lithium ion battery |
| CN115411828A (en) * | 2022-11-02 | 2022-11-29 | 深圳多为智联科技有限公司 | Interphone battery protection circuit and interphone |
-
2018
- 2018-12-28 CN CN201822236547.8U patent/CN209119865U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946491A (en) * | 2021-01-22 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Device and method for testing safety of ternary lithium ion battery |
| CN112946491B (en) * | 2021-01-22 | 2023-04-28 | 合肥国轩高科动力能源有限公司 | Ternary lithium ion battery safety testing device and method |
| CN115411828A (en) * | 2022-11-02 | 2022-11-29 | 深圳多为智联科技有限公司 | Interphone battery protection circuit and interphone |
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