CN213243523U - Battery short-circuit protection circuit - Google Patents
Battery short-circuit protection circuit Download PDFInfo
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- CN213243523U CN213243523U CN202021701360.1U CN202021701360U CN213243523U CN 213243523 U CN213243523 U CN 213243523U CN 202021701360 U CN202021701360 U CN 202021701360U CN 213243523 U CN213243523 U CN 213243523U
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Abstract
The utility model discloses a battery short-circuit protection circuit relates to battery BMS management circuit technical field. The utility model discloses a series battery group, fusing fuse, EMC wave filter and load monitor, wherein the series battery group is parallelly connected with the load monitor through fusing fuse, charge-discharge switch and current detection resistance R1, and the load monitor inserts battery circuit with EMC wave filter is parallelly connected. The utility model can realize the short-circuit protection of the battery and the load under different working states by setting the load monitor to monitor the voltage and current states of the load in real time; when the output end of the battery is short-circuited or connected with a capacitive load, the attenuation internal resistance of the battery is increased, and the battery is protected between short circuit and overcurrent, the battery circuit and a load device can be protected by the short-circuit protection circuit; in addition, through setting up the fusing fuse, can provide another heavy safety protection for the circuit, when MOS pipe became invalid, fusing fuse carries out fusing protection circuit promptly.
Description
Technical Field
The utility model belongs to the technical field of battery BMS management circuit, especially, relate to a battery short circuit protection circuit.
Background
In the process of charging and discharging the battery, due to some reason, the anode and the cathode of the output end of the battery form an abnormal passage, the abnormal passage can generate very large current and very much heat, the temperature is very high, and the fire disaster is very easily caused, so that property and life safety are threatened.
In battery BMS management system, in order to prevent that battery short circuit from taking place the accident in the use, often carry out protection design to battery output short circuit phenomenon for prevent that the accident from taking place, ensure the product normal work simultaneously.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery short-circuit protection circuit solves among the current battery BMS management system because the battery short circuit causes the problem of accident such as conflagration.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a battery short-circuit protection circuit, including series connection group battery, fusing fuse, EMC wave filter and load monitor, series connection group battery is provided with pin B + and pin B-, pin B + is connected with the fusing fuse for carry out the fusing protection to the load of short-circuit condition, the load monitor is parallelly connected with series connection group battery and fusing fuse, is used for surveying load voltage and carries out real-time judgement, the EMC wave filter is parallelly connected with the load monitor.
Furthermore, one end of the fusing fuse is connected with a discharging switch M2 and an auxiliary switch, the auxiliary switch is connected with the discharging switch M2 in parallel, one end of the discharging switch M2 is connected with a charging switch M1, and one end of the charging switch M1 is connected with a load monitor and is connected to the P + end of the assembled battery.
Furthermore, one end of the load monitor is connected with a single-chip microcomputer MCU, and one end of the single-chip microcomputer MCU is connected with an auxiliary switch; the other end of the load monitor is connected with the P-end of the assembled battery, and the other end of the load monitor is connected with a current detection resistor R1 and is connected with a pin B-through a current detection resistor R1.
Further, the EMC filters are connected to the P + terminal and the P-terminal of the assembled battery, respectively, and the EMC filters are connected in parallel to the series battery pack and the blown fuse via a current detection resistor R1, a charge switch M1, and a discharge switch M2.
Further, the resistance value of the current detection resistor R1 is less than 2 milliohms, and the charge switch M1 and the discharge switch M2 are both MOS transistors.
The utility model discloses following beneficial effect has:
the utility model can realize the short-circuit protection of the battery and the load under different working states by setting the load monitor to monitor the voltage and current states of the load in real time; when the output end of the battery is short-circuited or connected with a capacitive load, the attenuation internal resistance of the battery is increased, and the battery is protected between short circuit and overcurrent, the battery circuit and a load device can be protected by the short-circuit protection circuit; in addition, through setting up the fusing fuse, can provide another heavy safety protection for the circuit, when MOS pipe became invalid, fusing fuse carries out fusing protection circuit promptly.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system block diagram of a battery short-circuit protection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "middle", "outer", "inner", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Please refer to fig. 1, the utility model relates to a battery short-circuit protection circuit, including series battery group, fusing fuse, EMC wave filter and load monitor, series battery group is provided with pin B + and pin B-, and pin B + is connected with fusing fuse for carry out fusing protection to the load of short circuit state, load monitor and series battery group and fusing fuse are parallelly connected, are used for surveying load voltage and carry out real-time judgement, and the EMC wave filter is parallelly connected with load monitor.
Preferably, one end of the fuse is connected with a discharging switch M2 and an auxiliary switch, the auxiliary switch is connected with the discharging switch M2 in parallel, one end of the discharging switch M2 is connected with a charging switch M1, and one end of the charging switch M1 is connected with the load monitor and is connected to the P + end of the assembled battery.
Preferably, one end of the load monitor is connected with the single chip microcomputer MCU, and one end of the single chip microcomputer MCU is connected with the auxiliary switch; the other end of the load monitor is connected with the P-end of the combined battery, and the other end of the load monitor is connected with a current detection resistor R1 and is connected with a pin B-through a current detection resistor R1.
Preferably, EMC filters are connected to the P + terminal and the P-terminal of the assembled battery, respectively, and the EMC filters are connected in parallel with the series battery pack and the blown fuse via a current detection resistor R1, a charge switch M1, and a discharge switch M2.
Preferably, the resistance value of the current detection resistor R1 is less than 2 milliohms, and the charge switch M1 and the discharge switch M2 are both MOS transistors.
Example 1:
referring to fig. 1, the present embodiment is a working principle and a working method of a battery short-circuit protection circuit:
in the series battery PACK, when the output terminals P + and P-of the assembled battery PACK are not normally in contact, or the load is a very large capacitive load. The output end voltage P + and P-is loaded on the load with the extremely small resistance value, an extremely large current can be generated to impact the load, and the MOS tube can bear the impact current within a certain time. In order to prevent the charging switch M1 and the discharging switch M2 from being damaged by the impact of the extremely large current, in the short-circuit protection circuit, when the load is connected with P + and P-, and the output current reaches the peak current Idm of the MOS tube, according to the actual application scenes of the load and the circuit, the MOS tube is closed within 100 mu S, the main discharging loop is disconnected, and meanwhile, the auxiliary switch is opened, so that the load is continuously discharged;
the load monitor detects the load voltage, judges whether the load is in a short-circuit state or a capacitive load state according to the magnitude of the load voltage: if the load voltage is after the MOS tube is disconnected, the auxiliary switch is opened within a certain time, the load is always 0V, the output short circuit is judged, and the short circuit protection mark is executed; if the load monitor detects that a certain voltage value exists, the auxiliary switch is simultaneously turned on when the MOS tube is turned off to pre-discharge the load, the load voltage is monitored in real time within hundreds of milliseconds, the load voltage is judged again, the MOS tube of the discharge switch is turned on again when the load voltage is higher than a certain percentage or rises to be close to the voltage value of the battery and the auxiliary switch reaches a certain time, and the auxiliary switch is turned off at the same time to prolong the turn-on time of the MOS tube of the discharge switch to hundreds of microseconds; judging whether the load voltage and the battery are in a close state, and if the load voltage and the battery are in the close state, keeping discharging on; if the load voltage does not change within hundreds of microseconds, the MOS tube of the discharge switch is closed again, and the short-circuit protection mark is executed. And the battery is protected by judging the change of the load voltage.
In the service life cycle of the battery, the capacity of the battery is continuously attenuated, the internal resistance is increased, when the load of the battery is in short circuit, the discharge current of the battery still does not reach the short circuit state and is between the short circuit protection state and the overcurrent protection state, and the state of the voltage and the current of the output circuit is judged by prolonging the opening time of the MOS tube of the discharge switch and the auxiliary switch for a plurality of times. And in a certain time interval, when a certain number of times of overcurrent protection states are reached, closing the discharge switch MOS tube, and disconnecting the output voltage to carry out output short-circuit protection.
Potential failure state exists in the electronic device in the product use, if discharge switch MOS pipe became invalid, DS pin was in the short circuit state, and the load also was in the short circuit state this moment, and fusing fuse carries out fusing protection, prevents that the battery from taking place the accident that the short circuit arouses.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A battery short-circuit protection circuit, includes series connection group battery, fusing fuse, EMC filter and load monitor, its characterized in that: the series battery pack is provided with a pin B + and a pin B-, the pin B + is connected with the fusing fuse, the load monitor is connected with the series battery pack and the fusing fuse in parallel, and the EMC filter is connected with the load monitor in parallel.
2. The battery short-circuit protection circuit of claim 1, wherein a discharging switch M2 and an auxiliary switch are connected to one end of the fuse, the auxiliary switch is connected in parallel with the discharging switch M2, a charging switch M1 is connected to one end of the discharging switch M2, one end of the charging switch M1 is connected to the load monitor and is connected to the P + terminal of the assembled battery.
3. The battery short-circuit protection circuit according to claim 2, wherein one end of the load monitor is connected with a single-chip microcomputer MCU, and one end of the single-chip microcomputer MCU is connected with an auxiliary switch; the other end of the load monitor is connected with the P-end of the assembled battery, and the other end of the load monitor is connected with a current detection resistor R1 and is connected with a pin B-through a current detection resistor R1.
4. The battery short-circuit protection circuit according to claim 1, wherein the EMC filter is connected to the P + terminal and the P-terminal of the assembled battery, respectively, and the EMC filter is connected in parallel to the series battery pack and the blown fuse via a current detection resistor R1, a charge switch M1, and a discharge switch M2.
5. The battery short-circuit protection circuit of claim 3, wherein the current detection resistor R1 has a resistance value less than 2 mOhm, and the charge switch M1 and the discharge switch M2 are both MOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021701360.1U CN213243523U (en) | 2020-08-16 | 2020-08-16 | Battery short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021701360.1U CN213243523U (en) | 2020-08-16 | 2020-08-16 | Battery short-circuit protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213243523U true CN213243523U (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021701360.1U Active CN213243523U (en) | 2020-08-16 | 2020-08-16 | Battery short-circuit protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115810811A (en) * | 2022-01-07 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Battery pack active fuse control device |
| CN117879559A (en) * | 2023-12-21 | 2024-04-12 | 宁波兴为汽车电子有限公司 | Secondary protection device and protection method for MOS high-side output failure |
-
2020
- 2020-08-16 CN CN202021701360.1U patent/CN213243523U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115810811A (en) * | 2022-01-07 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Battery pack active fuse control device |
| CN115810811B (en) * | 2022-01-07 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Active fuse control device for battery pack |
| CN117879559A (en) * | 2023-12-21 | 2024-04-12 | 宁波兴为汽车电子有限公司 | Secondary protection device and protection method for MOS high-side output failure |
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