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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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims description 36
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 108091027981 Response element Proteins 0.000 abstract 1
- 230000005856 abnormality Effects 0.000 abstract 1
- 230000001771 impaired effect Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 102100030393 G-patch domain and KOW motifs-containing protein Human genes 0.000 description 14
- 101150090280 MOS1 gene Proteins 0.000 description 14
- 101100401568 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MIC10 gene Proteins 0.000 description 14
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 10
- 101150055297 SET1 gene Proteins 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 8
- 238000007599 discharging Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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 a battery short-circuit protection technical field especially relates to a many strings of lithium cell hardware short-circuit protection circuit.
Background
At present, the voltage of many strings of lithium batteries is high, and the capacity is big, and outside short circuit electric current is very big in the twinkling of an eye, generally is several hundred amperes, and even thousands of amperes, integrated protection chip because the reason of overall arrangement distance or driving force, when the response is untimely or the protection is inefficacy under the short circuit state, causes protection shield component to damage very easily, damages electric core even, arouses the incident. Therefore, in order to prevent the occurrence of safety accidents such as damage to components or cells in a short-circuit state, an independent hardware short-circuit protection circuit is needed to quickly respond and timely cut off a current loop to achieve a protection effect.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model aims to provide a many strings of lithium cell hardware short circuit protection circuit has solved among the prior art integrated protection chip because the reason of overall arrangement distance or driving force, when the response is untimely or the protection became invalid under the short-circuit condition, causes protection shield component to damage very easily, damages electric core even, arouses the problem of incident.
The utility model provides a hardware short-circuit protection circuit for a plurality of strings of lithium batteries, which comprises a current detection circuit, a current comparison circuit and a control circuit; wherein,
the current detection circuit comprises a sampling resistor and a current sampling circuit, the current comparison circuit comprises a voltage comparator and a divider resistor, and the control circuit comprises a latch circuit, a drive circuit and an MOS (metal oxide semiconductor) tube;
sampling resistor establishes ties between the negative pole of monomer lithium cell and the negative pole of the group battery that many strings of lithium cells are constituteed, current sampling circuit's input with sampling resistor connects, current sampling circuit's output with an input of voltage comparator is connected, another input of voltage comparator passes through divider resistance is connected with reference voltage, voltage comparator's output with latch circuit's input is connected, latch circuit's output with drive circuit's input is connected, drive circuit's output with the grid of MOS pipe is connected, the MOS pipe is established ties between the negative pole of group battery and the output of current loop.
Further, the current sampling circuit comprises a current monitor and a common mode sampling circuit, wherein the positive input end and the negative input end of the current monitor are connected with the sampling resistor through the common mode sampling circuit, the power end of the current monitor is connected with a working power supply, the reference voltage end of the current monitor is connected with reference voltage, and the output end of the current monitor is connected with one input end of the voltage comparator.
Furthermore, the voltage comparator is a dual-voltage comparator, the voltage dividing resistor includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor, a positive input terminal of the first voltage comparator of the dual-voltage comparator is connected to a working power supply through the first voltage dividing resistor, a negative input terminal of the first voltage comparator is connected to an output terminal of the current monitor, a positive input terminal of the second voltage comparator of the dual-voltage comparator is connected to an output terminal of the current monitor, and a negative input terminal of the second voltage comparator is connected to the first voltage dividing resistor through the second voltage dividing resistor and grounded through the third voltage dividing resistor.
Furthermore, the current comparison circuit further comprises an and gate circuit composed of a first diode and a second diode, wherein the cathode of the first diode is connected with the output end of the first voltage comparator, the cathode of the second diode is connected with the output end of the second voltage comparator, and the anode of the first diode and the anode of the second diode are connected with the latch circuit.
Further, the latch circuit comprises an SR latch, a first pull-up resistor and a second pull-up resistor, the input end of the first nand gate chip of the dual nand gate chip with the set-0 terminal is connected with the anode of the first diode and is connected to a working power supply through the first pull-up resistor, the input end of the first nand gate chip with the set-1 terminal is connected to the control terminal of the driving circuit, the power terminal of the first nand gate chip is connected to the working power supply, the output end of the first nand gate chip is connected to the input end of the second nand gate chip with the set-0 terminal, the input end of the second nand gate chip with the set-1 terminal is connected to the working power supply through the second pull-up resistor, and the output end of the second nand gate chip is connected to the control terminal of the driving circuit.
Furthermore, the control end of the driving circuit comprises a first control end and a second control end, the first control end of the driving circuit is connected with the input end of the first nand gate chip, which is provided with the 1, and the second control end of the driving circuit is connected with the output end of the second nand gate chip.
Further, the MOS transistor includes a first MOS transistor and a second MOS transistor, a gate of the first MOS transistor is connected to the first output terminal of the driving circuit, and a gate of the second MOS transistor is connected to the second output terminal of the driving circuit.
Furthermore, the first MOS tube and the second MOS tube are both N-type MOS tubes, the source electrode of the first MOS tube is connected with the negative electrode of the battery pack, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected to the output end of the current loop.
The output end of the first NAND gate chip is connected with the first input end of the controller, and the input end of the second NAND gate chip, which is provided with a 1, is connected with the second input end of the controller.
Further, the latch circuit further comprises a third diode and a fourth diode, the input end of the first nand gate chip with 1 is connected with the cathode of the third diode, the anode of the third diode is connected with the first control end of the driving circuit, the output end of the second nand gate chip is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the second control end of the driving circuit.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a many clusters of lithium cell hardware short-circuit protection circuit, utilize the electric current and the output voltage signal of current monitor detection current return circuit, when the short circuit takes place for the charging or the discharge process of current return circuit, charging current or discharge current are too big, the reference voltage that current monitor output voltage surpassed voltage comparator and set for, voltage comparator output voltage signal control SR latch output can latch the reverse voltage signal who keeps to drive circuit's control end, control drive circuit shutoff MOS pipe, and then the open current return circuit, play the guard action when the electric current is too big, adopt pure hardware circuit component design because of the circuit, response time can reach the microsecond level, can in time react to short circuit abnormal state, quick response and in time cut off current return circuit, reach the undamaged purpose of protection component and lithium cell, safety and reliability.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a circuit diagram of a hardware short-circuit protection circuit for multiple strings of lithium batteries.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
A hardware short-circuit protection circuit for a multi-string lithium battery is shown in figure 1 and comprises a current detection circuit, a current comparison circuit and a control circuit; wherein,
the current detection circuit comprises a sampling resistor RS1 and a current sampling circuit, the current comparison circuit comprises a voltage comparator and a divider resistor, and the control circuit comprises a latch circuit, a drive circuit and an MOS (metal oxide semiconductor) tube;
the sampling resistor RS1 is connected in series between the negative pole Pack of the single lithium Battery and the negative pole Pack of the Battery Pack consisting of a plurality of strings of lithium batteries, the input end of the current sampling circuit is connected with the sampling resistor RS1, the Output end of the current sampling circuit is connected with one input end of the voltage comparator, the other input end of the voltage comparator is connected with the reference voltage through the divider resistor, the Output end of the voltage comparator is connected with the input end of the latch circuit, the Output end of the latch circuit is connected with the input end of the drive circuit, the Output end of the drive circuit is connected with the grid electrode of the MOS tube, and the MOS tube is connected in series between the negative pole Pack of the Battery Pack and the Output end Output of the current loop.
As shown in fig. 1, preferably, the current sampling circuit includes a current monitor U1 and a common mode sampling circuit, the common mode sampling circuit is composed of R1, R2 and C1, a positive input terminal of the current monitor U1 is connected to one end of a sampling resistor RS1 through R1 of the common mode sampling circuit, a negative input terminal of the current monitor U1 is connected to the other end of the sampling resistor RS1 through R2 of the common mode sampling circuit, C1 is connected between a positive input terminal and a negative input terminal of the current monitor U1, a power supply terminal of the current monitor U1 is connected to an operating power supply VCC, a reference voltage terminal of the current monitor U1 is connected to a reference voltage VREF, an output terminal of the current monitor U1 is connected to an input terminal of a voltage comparator, the current sampling circuit further includes filter capacitors C42, C3 and C4, the filter capacitor C2 is connected between the power supply terminal of the current monitor and the operating power supply VCC, one ends of the filter capacitors C5 and C4 are connected between the reference voltage terminal of the current monitor U, the other ends of the filter capacitors C3 and C4 are grounded. In this embodiment, the output voltage Uo of the current monitor U1 is UVREF + n (Usnsp-Usnsn), UVREF is an input reference voltage of the current monitor U1, n is a gain multiple of the current monitor U1, Usnsp and Usnsn are voltages at two terminals of the sampling resistor RS1, and VCC is a constant operating voltage of U. In this embodiment, including but not limited to the current monitor U1, it can also be implemented by a feedback amplifying circuit composed of an operational amplifier.
As shown in fig. 1, preferably, the voltage comparator is a dual voltage comparator, the voltage dividing resistor includes a first voltage dividing resistor R5, a second voltage dividing resistor R6 and a third voltage dividing resistor R7, a positive input terminal of a first voltage comparator U2A of the dual voltage comparator is connected to the operating power VCC through the first voltage dividing resistor R5, a power terminal of the first voltage comparator U2A is connected to the operating power VCC, a negative input terminal of the first voltage comparator U2A is connected to an output terminal of the current monitor U1, a positive input terminal of a second voltage comparator U2B of the dual voltage comparator is connected to an output terminal of the current monitor U1, a negative input terminal of the second voltage comparator U2B is connected to the first voltage dividing resistor R5 through the second voltage dividing resistor R6 and is grounded through the third voltage resistor R7, the current comparing circuit further includes an input signal filter element composed of R3 and C5 and an input signal filter element composed of R4 and C6, A filter capacitor C7, a negative input end of the first voltage comparator U2A is connected with an output end of the current monitor U1 through a resistor R3, a capacitor C5 is connected between the resistor R3 and the negative input end of the first voltage comparator U2A and grounded, a positive input end of the second voltage comparator U2B is connected with an output end of the current monitor U1 through a resistor R4, a capacitor C6 is connected between the resistor R4 and a positive input end of the second voltage comparator U2B and grounded, and a filter capacitor C7 is connected between a power supply end of the first voltage comparator U2A and the working power supply VCC and grounded. In this embodiment, Ua and Ub are reference voltages of the first voltage comparator U2A and the second voltage comparator U2B, where VCC is obtained by dividing voltage through three resistors R5, R6, and R7, specifically, Ua is a reference voltage at a positive input terminal of the first voltage comparator U2A, Ub is a reference voltage at a negative input terminal of the second voltage comparator U2B, and Uc is a voltage signal obtained by outputting a voltage signal from the first voltage comparator U2A and the second voltage comparator U2B and passing through a logic and gate formed by D1 and D2.
In one embodiment, the current comparing circuit further includes an and circuit including a first diode D1 and a second diode D2, a cathode of the first diode D1 is connected to the output terminal of the first voltage comparator U2A, an anode of the second diode D2 is connected to the output terminal of the second voltage comparator U2B, and an anode of the first diode D1 and an anode of the second diode D2 are connected to the latch circuit.
As shown in fig. 1, preferably, the latch circuit includes an SR latch composed of dual nand chips, a first pull-up resistor R8, and a second pull-up resistor R9, a set-0 input terminal of a first nand chip U3A of the dual nand chip is connected to an anode of a first diode D1, and is connected to the operating power VCC through the first pull-up resistor R8, a set-1 input terminal of the first nand chip U3A is connected to a control terminal of the driving circuit, a power terminal of the first nand chip U3A is connected to the operating power VCC, an output terminal of the first nand chip U3A is connected to a set-0 input terminal of a second nand chip U3B of the dual nand chip, a set-1 input terminal of the second nand chip U3B is connected to the operating power VCC through the second pull-up resistor R9, and an output terminal of the second nand chip U3B is connected to the control terminal of the driving circuit. In this embodiment, the SR latch including but not limited to a dual nand gate chip can also be implemented by a dedicated SR latch chip.
As shown in fig. 1, preferably, the control terminal of the driving circuit includes a first control terminal CHGOFF and a second control terminal DSGOFF, the first control terminal CHGOFF of the driving circuit is connected to the input terminal of the nand-gate chip U3A, and the second control terminal DSGOFF of the driving circuit is connected to the output terminal of the nand-gate chip U3A. Preferably, the MOS transistor includes a first MOS transistor MOS1 and a second MOS transistor MOS2, the gate of the first MOS transistor MOS1 is connected to the first output terminal MOS1OFF of the driving circuit, and the gate of the second MOS transistor MOS2 is connected to the second output terminal MOS2OFF of the driving circuit. Preferably, the first MOS transistor MOS1 and the second MOS transistor MOS2 are both N-type MOS transistors, the source of the first MOS transistor MOS1 is connected to the negative pole Pack-of the battery Pack, the drain of the first MOS transistor MOS1 is connected to the drain of the second MOS transistor MOS2, and the source of the second MOS transistor MOS2 is connected to the Output of the current loop.
As shown in fig. 1, the latch circuit further includes a filter capacitor C8, a third diode D3 and a fourth diode D4, the third diode D3 and the fourth diode D4 are used for protecting the SR latch and the driving circuit, the filter capacitor C8 is connected between the power supply terminal of the first nand-gate chip U3A and the ground, the input terminal of the first nand-gate chip U3A, which is set to 1, is connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the first control terminal CHGOFF of the driving circuit, the output terminal of the second nand-gate chip U3B is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the second control terminal of the driving circuit DSGOFF.
In one embodiment, it is preferable that the nand-gate chip further includes a controller, an output of the first nand-gate chip U3A is connected to a first input of the controller SCEVENT, and a set-1 input of the second nand-gate chip U3B is connected to a second input of the controller SCRLEASE.
The working principle of the multi-string lithium battery hardware short-circuit protection circuit is as follows: under normal conditions, Uo is greater than Ub and less than Ua, the first voltage comparator U2A and the second voltage comparator U2B both Output high level voltage signals, and the voltage signal Uc after passing through the logic and gate formed by D1 and D2 is a high level voltage signal, that is, the 1 setting input Us of the first nand gate chip U3A and the 0 setting input Ur of the second nand gate chip U3B are kept as high level voltage signals, so the SR latch initial state Output Uq keeps as high level voltage signals due to the connection to the first control terminal CHGOFF and the second control terminal DSGOFF of the driving circuit, and therefore the secondary state Output Uq1 keeps as low level voltage signals, that is, the first control terminal CHGOFF and the second control terminal DSGOFF keep as high level signals, the driving circuit outputs MOS signals of the control terminals 1OFF and MOS2OFF of MOS1 and MOS2 are all high level, MOS1 and MOS2 are in a state, and the MOS circuit is turned on from bat-hold to Output-power-circuit, the first input end SCEVENT of the controller keeps a low-level voltage signal, and the protection control action cannot occur; the threshold value of the charging and discharging short-circuit protection current is adjusted by adjusting the resistance value of the sampling resistor RS1, the gain multiple n of the current monitor U1, the input reference voltage VREF of the current monitor U1 and the resistance values of the voltage dividing resistors R5, R6 and R7;
in a charging state, the current direction is from the Battery-end to the Pack-end through the RS1, the voltage ussnp at the two ends of the RS1 is greater than Usnsn, and the calculation formula of the output voltage Uo shows that when the charging current is greater, the larger the Usnsp-Usnsn is, that is, the greater the Uo is, when the Uo is increased to exceed the reference voltage Ua obtained by dividing the positive input end of the first voltage comparator U2A by the R5, the R6 and the R7, the first voltage comparator U2A outputs a low-level voltage signal, the voltage signal Uc after passing through the logic and gate formed by the D1 and the D2 is changed into a low-level voltage signal, that is, the 0 setting input end Ur of the second nand gate U3B is changed into a low-level voltage signal, the 1 setting input end Us of the first nand gate U3A is kept as a high-level voltage signal, and the characteristic of the SR latch is known that the secondary-state output end Uq 1of the SR latch is changed into a high-state voltage signal, and the primary voltage output end of the SR latch is changed into a low, the protection state is known to occur at this time through the signal of the first input terminal sceen, that is, the signals of the first control terminal CHGOFF and the second control terminal DSGOFF connected to the driving circuit become low level, the signals of the control terminals MOS1OFF and MOS2OFF Output to the MOS1 and MOS2 by the driving circuit are low level, the MOS1 and MOS2 are OFF state, the current loop from Battery-to Pack-to Output-is disconnected to play a protection role, and after the MOS1 and MOS2 are turned OFF, because the loop current becomes 0, the states of the current monitor U1 and the dual-voltage comparator are restored to 2 normal states, that is, the state of the set-1 input terminal Us and the set-0 input terminal Ur of the SR latch are protected to high level voltage signals to play a role of locking the current protection Output state;
in the discharging state, the current direction is from Pack-end to Battery-end through RS1, the voltage Unsp at two ends of RS1 is smaller than Unsn, the calculation formula of the output voltage Uo shows that when the discharging current is larger, Unsp-Unsn is smaller, namely Uo is smaller, when Uo is reduced to be lower than the reference voltage Ub obtained by dividing the negative input end of the second voltage comparator U2B by R5, R6 and R7, the second voltage comparator U2B outputs a low level voltage signal, the voltage signal Uc after logic and gate formed by D1 and D2 is changed into a low level voltage signal, namely the input end Ur of set 0 of the SR latch is changed into a low level voltage signal, the input end Us of set 1 is kept as a high level voltage signal, the characteristic of the SR latch shows that the secondary state output end Uq 1of the SR latch is changed into a high level voltage signal, the signal of the first input end SCEVEN shows that the primary protection state occurs, and the output end of the SR latch is changed into a low level voltage Uq, namely, signals of a first control terminal CHGOFF and a second control terminal DSGOFF which are connected to a driving circuit are changed into low level, signals of a control terminal MOS1OFF and a control terminal MOS2OFF which are Output to a MOS1 and a MOS2 by the driving circuit are changed into low level, the MOS1 and the MOS2 are in an OFF state, a current loop from Battery-to Pack-to Output-is disconnected to play a protection role, and after the loop MOS1 and the MOS2 are switched OFF, because the loop current is changed into 0, the states of a current monitor U1 and a dual-voltage comparator are restored to 2 normal states, namely a set-1 input terminal Us and a set-0 input terminal Ur of an SR latch are protected into high-level voltage signals to play a role of locking the current protection Output state;
when the SR latch is in the protection state, that is, the secondary output end Uq 1of the SR latch is a high level voltage signal, and the primary output end Uq is a low level, a low level voltage signal is input through the second input end SCRLEASE, that is, a low level signal is provided to the set-1 input end Us of the SR latch, and as can be seen from the characteristics of the SR latch, the primary output end of the SR latch recovers to the high level voltage signal, that is, the signals connected to the first control end CHGOFF and the second control end DSGOFF of the driving circuit become high level, the driving circuit is controlled to reopen the MOS1 and the MOS2 to recover the output, and the secondary output end Uq1 recovers to the low level voltage signal, and it is known that the protection state has recovered at this time through the first input end sceen.
The utility model provides a many clusters of lithium cell hardware short-circuit protection circuit, utilize the electric current and the output voltage signal of current monitor detection current return circuit, when the short circuit takes place for the charging or the discharge process of current return circuit, charging current or discharge current are too big, the reference voltage that current monitor output voltage surpassed voltage comparator and set for, voltage comparator output voltage signal control SR latch output can latch the reverse voltage signal who keeps to drive circuit's control end, control drive circuit shutoff MOS pipe, and then the open current return circuit, play the guard action when the electric current is too big, adopt pure hardware circuit component design because of the circuit, response time can reach the microsecond level, can in time react to short circuit abnormal state, quick response and in time cut off current return circuit, reach the undamaged purpose of protection component and lithium cell, safety and reliability.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a many strings of lithium cell hardware short-circuit protection circuit which characterized in that: the device comprises a current detection circuit, a current comparison circuit and a control circuit; wherein,
the current detection circuit comprises a sampling resistor and a current sampling circuit, the current comparison circuit comprises a voltage comparator and a divider resistor, and the control circuit comprises a latch circuit, a drive circuit and an MOS (metal oxide semiconductor) tube;
sampling resistor establishes ties between the negative pole of monomer lithium cell and the negative pole of the group battery that many strings of lithium cells are constituteed, current sampling circuit's input with sampling resistor connects, current sampling circuit's output with an input of voltage comparator is connected, another input of voltage comparator passes through divider resistance is connected with reference voltage, voltage comparator's output with latch circuit's input is connected, latch circuit's output with drive circuit's input is connected, drive circuit's output with the grid of MOS pipe is connected, the MOS pipe is established ties between the negative pole of group battery and the output of current loop.
2. The multi-string lithium battery hardware short-circuit protection circuit of claim 1, characterized in that: the current sampling circuit comprises a current monitor and a common-mode sampling circuit, wherein the positive input end and the negative input end of the current monitor are connected with the sampling resistor through the common-mode sampling circuit, the power end of the current monitor is connected with a working power supply, the reference voltage end of the current monitor is connected with reference voltage, and the output end of the current monitor is connected with one input end of the voltage comparator.
3. The multi-string lithium battery hardware short-circuit protection circuit of claim 2, wherein: the voltage comparator is a dual-voltage comparator, the voltage dividing resistor comprises a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, a positive input end of a first voltage comparator of the dual-voltage comparator is connected to a working power supply through the first voltage dividing resistor, a negative input end of the first voltage comparator is connected with an output end of the current monitor, a positive input end of a second voltage comparator of the dual-voltage comparator is connected with an output end of the current monitor, and a negative input end of the second voltage comparator is connected with the first voltage dividing resistor through the second voltage dividing resistor and is grounded through the third voltage dividing resistor.
4. The multi-string lithium battery hardware short-circuit protection circuit of claim 3, wherein: the current comparison circuit further comprises an AND gate circuit consisting of a first diode and a second diode, wherein the cathode of the first diode is connected with the output end of the first voltage comparator, the cathode of the second diode is connected with the output end of the second voltage comparator, and the anode of the first diode and the anode of the second diode are connected with the latch circuit.
5. The multi-string lithium battery hardware short-circuit protection circuit of claim 4, wherein: the latch circuit comprises an SR latch, a first pull-up resistor and a second pull-up resistor, wherein the SR latch, the first pull-up resistor and the second pull-up resistor are formed by double NAND gate chips, the input end of the first NAND gate chip with a set 0 is connected with the anode of the first diode and is connected with a working power supply through the first pull-up resistor, the input end of the first NAND gate chip with a set 1 is connected with the control end of the driving circuit, the power end of the first NAND gate chip is connected with the working power supply, the output end of the first NAND gate chip is connected with the input end of the second NAND gate chip with a set 0, the input end of the second NAND gate chip with a set 1 is connected with the working power supply through the second pull-up resistor, and the output end of the second NAND gate chip is connected with the control end of the driving circuit.
6. The multi-string lithium battery hardware short-circuit protection circuit of claim 5, wherein: the control end of the driving circuit comprises a first control end and a second control end, the first control end of the driving circuit is connected with the input end of the first NAND gate chip, the input end of the first NAND gate chip is connected with the input end of the first NAND gate chip, and the second control end of the driving circuit is connected with the output end of the second NAND gate chip.
7. The multi-string lithium battery hardware short-circuit protection circuit of claim 6, wherein: the MOS tube comprises a first MOS tube and a second MOS tube, the grid electrode of the first MOS tube is connected with the first output end of the driving circuit, and the grid electrode of the second MOS tube is connected with the second output end of the driving circuit.
8. The multi-string lithium battery hardware short-circuit protection circuit of claim 7, wherein: the first MOS tube and the second MOS tube are both N-type MOS tubes, the source electrode of the first MOS tube is connected with the negative electrode of the battery pack, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected to the output end of the current loop.
9. The multi-string lithium battery hardware short-circuit protection circuit of claim 5, wherein: the output end of the first NAND gate chip is connected with the first input end of the controller, and the input end of the second NAND gate chip, which is provided with the 1, is connected with the second input end of the controller.
10. The multi-string lithium battery hardware short-circuit protection circuit of claim 6, wherein: the latch circuit further comprises a third diode and a fourth diode, the 1-setting input end of the first NAND gate chip is connected with the cathode of the third diode, the anode of the third diode is connected with the first control end of the driving circuit, the output end of the second NAND gate chip is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the second control end of the driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822236547.8U CN209119865U (en) | 2018-12-28 | 2018-12-28 | A kind of multi-series lithium battery hardware short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822236547.8U CN209119865U (en) | 2018-12-28 | 2018-12-28 | A kind of multi-series lithium battery hardware short-circuit protection circuit |
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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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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 |
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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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