CN114156960A - Battery pack detection method and device and power management system - Google Patents

Battery pack detection method and device and power management system Download PDF

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Publication number
CN114156960A
CN114156960A CN202011194111.2A CN202011194111A CN114156960A CN 114156960 A CN114156960 A CN 114156960A CN 202011194111 A CN202011194111 A CN 202011194111A CN 114156960 A CN114156960 A CN 114156960A
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China
Prior art keywords
battery pack
power transistor
current detection
switching element
voltage value
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Chinese (zh)
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梁勇
苟琼禄
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Shanghai Baicheng Electric Equipment Manufacture Co Ltd
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Shanghai Baicheng Electric Equipment Manufacture Co Ltd
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Priority to CN202011194111.2A priority Critical patent/CN114156960A/en
Publication of CN114156960A publication Critical patent/CN114156960A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the invention discloses a battery pack detection method, a battery pack detection device and a power management system. The detection method of the battery pack comprises the following steps: respectively providing an off control signal and an on control signal for a discharging power transistor of the battery pack, providing an on control signal for a switching element in a current detection loop, and respectively obtaining a first voltage value U1 of a second end of the switching element and a second voltage value U2 of the second end of the switching element in the current detection loop when the discharging power transistor is off and on, and if the difference value between the first voltage value U1 of the second end of the switching element and the second voltage value U2 of the second end of the switching element is smaller than a preset threshold value, determining that the discharging power transistor of the battery pack is damaged; whether a discharging power transistor of the battery pack is damaged or not is detected through a current detection loop interface of the battery pack, the service life of the battery pack is guaranteed, and potential safety hazards are reduced.

Description

Battery pack detection method and device and power management system
Technical Field
The embodiment of the invention relates to the field of battery packs, in particular to a battery pack detection method, a battery pack detection device and a power management system.
Background
On 9/3/2020, the german national technical safety committee ZLS formally issued a resolution EK9-BE-91(V3) on battery-powered electric tools/garden tools/mechanical products, which resolution put more stringent requirements on the Battery Management System (BMS) of the relevant product identifying the GS mark. This solution covers all battery-powered power tools, garden tools and mechanical products within the scope of the mechanical instructions. The Battery Management System (BMS) is to be assessed in accordance with EN62841-1, appendix K. The solution requires related products driven by lithium batteries, the battery cell needs to meet the requirements of IEC/EN62133-2, a Battery Management System (BMS) needs to be examined according to EN62841-1 appendix K, and the Battery Management System (BMS) additionally has the following three monitoring functions: cell temperature (high/low), cell voltage (high/low), and cell current (high/low), and the performance levels of the above three monitoring functions all need to satisfy PL ═ c.
In the prior art, if the discharge power transistor of battery package damages, the battery package can continue to discharge, until the motor can not during operation, wait that the battery package is discharged the electricity after, if put on the charger and continue to charge, the battery package itself still can continue to charge the use, leads to the life-span of electric core in the battery package to obtain very big loss, and then produces the security problem.
Disclosure of Invention
The embodiment of the invention provides a battery pack detection method, a battery pack detection device and a power management system, which are used for judging whether a discharge power transistor is damaged or not, reducing the loss of a battery core and reducing potential safety risks.
In a first aspect, an embodiment of the present invention provides a method for detecting a battery pack, including:
providing a disconnection control signal for a discharge power transistor of the battery pack, providing a connection control signal for a switching element in the current detection loop, and acquiring a voltage value U1 of a second end of the switching element in the current detection loop;
providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switching element in a current detection loop, and acquiring a voltage value U2 of a second end of the switching element in the current detection loop;
if the difference value between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold value, determining that a discharge power transistor of the battery pack is damaged; the discharging power transistor of the battery pack is connected in series between the grounding end of a battery core of the battery pack and the negative end of a load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative load end; and the second end of the switch element is electrically connected with the grounding end of the battery core.
Optionally, after determining that the discharge power transistor of the battery pack is damaged, the method further includes:
adding discharge power transistor damage flag information in the controller;
and when the battery pack is connected with an external charger, sending the damage marking information of the discharging power transistor to the external charger so as to indicate the external charger to carry out charging prohibition operation.
Optionally, after determining that the discharge power transistor of the battery pack is damaged, the method further includes:
and generating prompt information.
Optionally, the prompt message includes a voice warning message and/or a light warning message.
In a second aspect, an embodiment of the present invention provides a battery pack detection apparatus, including:
the first voltage value acquisition module is used for providing a disconnection control signal for a discharge power transistor of the battery pack, providing a connection control signal for a switching element in the current detection loop, and acquiring a first voltage value U1 at a second end of the switching element in the current detection loop;
the second voltage value acquisition module is used for providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switching element in the current detection loop, and acquiring a second voltage value U2 at a second end of the switching element in the current detection loop;
the discharging power transistor state determining module is used for determining that the discharging power transistor of the battery pack is damaged if the difference value between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold value;
the discharging power transistor of the battery pack is connected in series between the grounding end of a battery core of the battery pack and the negative end of a load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative load end; and the second end of the switch element is electrically connected with the grounding end of the battery core.
Optionally, the method further includes:
a marking module for adding discharge power transistor damage marking information in the controller after determining that a discharge power transistor of the battery pack is damaged;
and the indicating module is used for sending the damage marking information of the discharging power transistor to the external charger when the battery pack is connected with the external charger so as to indicate that the external charger prohibits charging operation.
Optionally, the battery pack further comprises an alarm module, configured to generate a prompt message after determining that the discharge power transistor of the battery pack is damaged.
In a third aspect, an embodiment of the present invention provides a power management system, including:
the device comprises a controller, a battery pack and a current detection loop;
the controller executes any one of the battery pack detection methods;
optionally, the battery pack further comprises an alarm device for generating a prompt message after determining that the discharge power transistor of the battery pack is damaged.
Optionally, the warning device includes an indicator light and/or a voice prompt.
The invention provides a detection method of a battery pack, which comprises the following steps: providing a disconnection control signal for a discharge power transistor of the battery pack, providing a connection control signal for a switching element in a current detection loop, and acquiring a first voltage value U1 of a second end of the switching element in the current detection loop; providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switching element in the current detection loop, and acquiring a second voltage value U2 of a second end of the switching element in the current detection loop; if the difference value between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold value, determining that a discharging power transistor of the battery pack is damaged; the discharging power transistor of the battery pack is connected in series between the grounding end of the battery core of the battery pack and the negative end of the load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative end of the load; the second end of the switch element is electrically connected with the grounding end of the battery core, the disconnection of the discharge power transistor and the conduction of the switch element are controlled in a short time, the change of the voltage value of the second end of the switch element is detected, and whether the discharge power transistor is damaged or not is judged, so that the effects of protecting the battery core and reducing potential safety risks are achieved.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a flowchart of a method for detecting a battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a circuit in a circuit package according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery pack detection apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power management system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Example one
Fig. 1 is a flowchart of a method for detecting a battery pack according to an embodiment of the present invention, and as shown in the first flowchart, the method for detecting a battery pack according to an embodiment of the present invention includes:
s101, providing a disconnection control signal for a discharge power transistor of a battery pack, providing a conduction control signal for a switching element in a current detection loop, and acquiring a first voltage value U1 of a second end of the switching element in the current detection loop;
s102, providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switch element in a current detection loop, and acquiring a second voltage value U2 of a second end of the switch element in the current detection loop;
s103, if the difference value between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold value, determining that a discharging power transistor of the battery pack is damaged;
the discharging power transistor of the battery pack is connected in series between the grounding end of the battery core of the battery pack and the negative end of the load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative end of the load; the second end of the switch element is electrically connected with the grounding end of the battery core.
Specifically, a discharging power transistor of the battery pack is connected in series between a battery core grounding end of the battery pack and a load negative end, and the load negative end can be used for being connected with an external load to discharge to the external load; the battery pack charging device can also be used for being connected with an external charger to charge the battery pack through a negative end of a load by the external charger; the discharge power transistor of the battery pack may be a discharge MOSFET transistor, or may be another transistor or a relay, etc. that can achieve the same or corresponding functions, which is not limited herein. The output end of the current detection loop is electrically connected with the detection end of the controller, the input end of the current detection loop is used for outputting the voltage value of the second end of the switch element, and the detection end of the controller is used for receiving the voltage value of the second end of the switch element output by the input end of the current detection loop, so that whether the discharge power transistor of the battery pack is damaged or not is judged. The control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop, the control end of the switching element of the current detection loop is used for controlling the switching-on and switching-off of the switching element, and the detection control end of the current detection loop is used for detecting and controlling the switching-on and switching-off signals of the switching element, so that whether the discharge power transistor of the battery pack is damaged or not is judged.
Specifically, fig. 2 is a schematic structural diagram of a partial circuit in a circuit package according to an embodiment of the present invention, and as shown in fig. 2, a discharge power transistor Q1 is connected in series between a battery core ground GND and a load negative terminal BAT —, of a battery package. Optionally, a voltage dividing and current limiting resistor R7 may be connected in series between the discharging power transistor Q1 and the battery core ground GND of the battery pack, and a voltage dividing resistor R6 may be connected in series between the gate of the discharging power transistor Q1 and the controller 10. The input end of the current detection circuit 11 is electrically connected to the negative load terminal BAT-, the first end a of the switching element M3 is electrically connected to the negative load terminal BAT-, and a voltage dividing resistor R10 is further connected in series between the first end a of the exemplary switching element M3 in fig. 2 and the negative load terminal BAT-. The second end B of the switching element M3 is electrically connected to the battery cell ground GND, and a voltage dividing resistor R11 is connected in series between the second end B of the exemplary switching element M3 in fig. 2 and the battery cell ground GND. The embodiment of the invention can control the on and off of the discharging power transistor Q1 of the battery pack, and when the battery pack is externally connected with a load, if the discharging power transistor Q1 is not damaged, the discharging power transistor Q1 of the battery pack is provided with an off control signal, and the discharging power transistor Q1 is actually off. If a turn-on control signal is provided to the switch element M3 in the current detection circuit 11, the switch element M3 is turned on, and at this time, the voltage difference between the negative load terminal BAT-and the battery core ground GND is large, the voltage of the negative load terminal BAT-is higher than the voltage of the battery core ground GND, a voltage difference is generated between the voltage dividing resistor R10 and the voltage dividing resistor R11 in the current detection circuit 11, the first voltage value U1 at the second terminal B of the switch element M3 is also large, and the first voltage value U1 is transmitted to the detection terminal C of the controller 10 through the output terminal of the current detection circuit 11. For example, if the voltage difference between the negative terminal BAT-of the load and the ground terminal GND of the battery cell is 18V in this state, the first voltage value U1 of the second terminal B of the switching element M3 is 2V at this time.
If the discharging power transistor Q1 is not damaged, when the battery pack is externally connected to a load, the discharging power transistor Q1 of the battery pack is provided with a turn-on control signal, and the discharging power transistor Q1 is turned on. If a turn-on control signal is provided to the switch element M3 in the current detection circuit 11, the switch element M3 is turned on, and at this time, the voltage difference between the negative load terminal BAT and the battery core ground GND is small, and a small voltage difference also exists between the voltage-dividing resistor R10 and the voltage-dividing resistor R11, so that compared with the case where the discharging power transistor Q1 is actually in the off state, the voltage difference generated between the negative load terminal BAT and the battery core ground GND is much smaller, the second voltage value U2 at the second terminal B of the switch element M3 is also smaller, and the second voltage value U2 is transmitted to the detection terminal C of the controller 10 through the output terminal of the current detection circuit 11. For example, assuming that the voltage difference between negative terminal BAT-of the load and ground terminal GND of the battery cell is 0.2V in this state, the second voltage value U2 at the second terminal B of the switching element M3 is 50 mV.
Therefore, when the discharging power transistor Q1 is not damaged, the first voltage value U1 at the second terminal B of the switching element M3 and the second voltage value U2 at the second terminal B of the switching element M3 are detected to be different, and the difference between the first voltage value U1 at the second terminal B of the switching element M3 and the second voltage value U2 at the second terminal B of the switching element M3 is greater, for example, as described in the above example, the difference between the first voltage value U1 at the second terminal B of the switching element M3 and the second voltage value U2 at the second terminal B of the switching element M3 is equal to 1.95V.
If the discharge power transistor Q1 is broken, when the battery pack is externally connected to a load, an off control signal is provided to the discharge power transistor Q1 of the battery pack, and the discharge power transistor Q1 is still actually turned on. If the switch element M3 in the current detection circuit 11 is provided with the on-control signal, the switch element M3 is turned on, and the voltage difference between the negative terminal BAT-of the load and the ground terminal GND of the battery cell is small, the first voltage value U1 at the second terminal B of the switch element M3 is also small. For example, assuming that the voltage difference between the negative terminal BAT-of the load and the ground terminal GND of the battery cell is 0.2V in this state, the second terminal B of the switching element M3 has the first voltage value U1 of 50 mV.
If the discharging power transistor Q1 is damaged, when the battery pack is externally connected with a load, a turn-on control signal is provided to the discharging power transistor of the battery pack, and the discharging power transistor Q1 is actually turned on. If the switch element M3 is turned on when the on-control signal is provided to the switch element in the current detection circuit 11, the voltage difference between the negative terminal BAT-of the load and the ground GND of the battery cell is small, and the second voltage value U2 at the second terminal B of the switch element M3 is also small. For example, in this state, the voltage difference between the negative terminal BAT-of the load and the ground terminal GND of the battery cell is still 0.2V, and the second voltage value U2 at the second terminal B of the switching element M3 is still 50mV, as when the off control signal is provided to the discharging power transistor of the battery pack.
Therefore, when the discharging power transistor Q1 is damaged, the first voltage value U1 of the second terminal B of the switching element M3 and the second voltage value U2 of the second terminal B of the switching element M3 obtained by detection are the same, for example, as described in the above example, the difference between the first voltage value U1 of the second terminal B of the switching element M3 and the second voltage value U2 of the second terminal B of the switching element M3 is equal to 0V.
Accordingly, the controller 10 can determine whether the discharging power transistor Q1 is damaged according to the difference between the first voltage value U1 at the second terminal B of the switching element M3 and the second voltage value U2 at the second terminal B of the switching element M3. That is, if the difference between the first voltage value U1 at the second terminal B of the switching element M3 and the second voltage value U2 at the second terminal B of the switching element M3 is smaller than the preset threshold, it is determined that the discharging power transistor Q1 of the battery pack is damaged.
Optionally, as shown in fig. 2, a transient suppression diode TVS1 is connected in series between the load positive terminal BAT + and the load negative terminal BAT —, and serves to protect the circuit from various surge pulses. The negative pole of the battery core is connected with the grounding end GND of the battery core, the number of the battery cores in the battery pack can be 1 or multiple, and the multiple battery cores can be connected in series or in parallel according to actual needs. In the exemplary battery pack of fig. 2, each battery cell CL1, battery cell CL2, battery cell CL3, battery cell CL and battery cell CL5 are connected in series, the number of battery cells is 5, and the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, and the capacitor C5 are arranged corresponding to the battery cells, which all function as a filter, and are not limited to the embodiment of the present invention. In the current detection circuit 11, a voltage dividing resistor R8 is connected in series with the gate of the switching element M3 and the controller 10, two ends of the voltage dividing resistor R11 are respectively connected in parallel with a capacitor C6 to perform a filtering function, and the zener diode ZD1 performs a function that the voltage is basically unchanged when the current can be changed in a large range.
With continuing reference to fig. 1, after determining that the discharge power transistor of the battery pack is damaged, optionally, the method further includes:
s104, adding damage marking information of the discharge power transistor in the controller;
and S105, when the battery pack is connected with an external charger, transmitting the damage mark information of the discharging power transistor to the external charger to instruct the external charger to perform charging prohibition operation.
Optionally, the controller 10 may be, for example, a single chip microcomputer, and if the controller 10 determines that the discharge power transistor Q1 is damaged, the controller 10 adds damage flag information of the discharge power transistor Q1 in the controller 10 to record damage information of the discharge power transistor Q1, so as to prevent the battery pack from being charged under the condition that the discharge power transistor Q1 is damaged, thereby causing the battery cell loss of the battery pack; when the battery pack is charged through the external charger, the battery pack can send the damage marking information of the discharging power transistor Q1 to the external charger, the external charger is forbidden to continue charging the battery pack, under the condition that the discharging power transistor Q1 of the battery pack is damaged, when the external charger charges the battery pack, the battery pack reminds the external charger that the internal part of the external charger is damaged, the external charger is forbidden to charge, and the phenomenon of over-charging or service life shortening of the battery pack is prevented in time. Optionally, after determining that the discharge power transistor of the battery pack is damaged, the method further includes:
and S106, generating prompt information.
Optionally, the prompt message includes a voice warning message and/or a light warning message.
Further, when the user charges the battery pack, if the external charger receives the damage marking information of the discharging power transistor Q1, the external charger determines that the discharging power transistor Q1 is damaged, the battery pack is prohibited from being charged, and voice warning information and/or light warning information are generated, so that the user can determine that the battery pack is damaged and needs to be maintained or replaced according to the indication information.
According to the technical scheme of the embodiment, the on and off of the discharge power transistor can be controlled in a short time, and the on and off of the switch element in the current detection loop are combined to provide the off control signal for the discharge power transistor of the battery pack, so that the first voltage value U1 of the second end of the switch element is determined; and providing a conduction control signal for a discharge power transistor of the battery pack, determining a second voltage value U2 of the second end of the switching element, and comparing the difference value of the first voltage value U1 of the second end of the switching element and the second voltage value U2 of the second end of the switching element with a preset threshold value delta U by the detection end of the controller so as to judge whether the discharge power transistor is damaged or not. If the discharging power transistor is damaged, the controller marks damage information, and the external charger is forbidden to continue charging the battery pack, so that the problems that the battery pack can still continue to be charged during next charging after the discharging power transistor is damaged in the prior art and the service life of the battery cell is greatly consumed are solved, the damage information of the discharging power transistor is determined by using a current detection loop of the battery pack, extra wiring is reduced, the cost is saved, and the potential safety hazard is effectively prevented.
Example two
Fig. 3 is a schematic structural diagram of a battery pack detection device according to a second embodiment of the present invention, and as shown in fig. 3, a battery pack detection device according to a second embodiment of the present invention includes:
a first voltage value obtaining module 201, configured to provide a turn-off control signal to a discharge power transistor of the battery pack, provide a turn-on control signal to a switching element in the current detection loop, and obtain a first voltage value U1 at a second end of the switching element in the current detection loop;
a second voltage value obtaining module 202, configured to provide a conduction control signal to a discharge power transistor of the battery pack, provide a conduction control signal to a switching element in the current detection loop, and obtain a second voltage value U2 at a second end of the switching element in the current detection loop;
the discharging power transistor state determination module 203 is configured to determine that the discharging power transistor of the battery pack is damaged if a difference between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold.
The discharging power transistor of the battery pack is connected in series between the grounding end of the battery core of the battery pack and the negative end of the load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative end of the load; the second end of the switch element is electrically connected with the grounding end of the battery core.
Optionally, the method further includes:
a marking module 204 for adding discharge power transistor damage marking information in the controller after determining that the discharge power transistor of the battery pack is damaged.
An indicating module 205, configured to send the discharging power transistor damage flag information to the external charger when the battery pack is connected to the external charger, so as to instruct the external charger to prohibit a charging operation.
Optionally, an alert module 206 is further included for generating a prompt message after determining that the discharge power transistor of the battery pack is damaged.
It should be noted that, since the battery pack detection apparatus provided in this embodiment can perform any of the detection methods of the battery pack provided in the above embodiments, the detection method of the battery pack has the same or corresponding beneficial effects, and details are not repeated herein.
According to the technical scheme, the battery pack detection device is provided with the voltage value acquisition module, the discharge power transistor state determination module, the marking module, the indicating module and the warning module, so that the quality of a discharge power transistor is judged, potential safety hazards are determined, meanwhile, an electric core is effectively protected, and the service life of a battery pack is guaranteed.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a power management system according to a third embodiment of the present invention, and as shown in fig. 4, a power management system 30 according to a third embodiment of the present invention includes:
a controller 10, a battery pack 32, and a current detection circuit 11;
the controller 31 executes the detection method of any one of the battery packs 32 of the above embodiments;
optionally, a warning device 34 is further included for generating a prompt message after determining that the discharge power transistor of the battery pack is damaged.
Optionally, the warning device 34 includes an indicator light and/or a voice prompt.
Since the power management system 30 provided in this embodiment includes any controller 10, battery pack 32, and current detection circuit 11 provided in the above embodiments, it has the same or corresponding beneficial effects as the controller 10, the battery pack 32, and the current detection circuit 11, and therefore, the description thereof is omitted.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method for detecting a battery pack, comprising:
providing a disconnection control signal for a discharge power transistor of the battery pack, providing a connection control signal for a switching element in a current detection loop, and acquiring a first voltage value U1 of a second end of the switching element in the current detection loop;
providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switching element in the current detection loop, and acquiring a second voltage value U2 of a second end of the switching element in the current detection loop;
if the difference value between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold value, determining that a discharge power transistor of the battery pack is damaged;
the discharging power transistor of the battery pack is connected in series between the grounding end of a battery core of the battery pack and the negative end of a load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative load end; and the second end of the switch element is electrically connected with the grounding end of the battery core.
2. The method of claim 1, after determining that a discharge power transistor of the battery pack is defective, further comprising:
adding discharge power transistor damage flag information in the controller;
and when the battery pack is connected with an external charger, sending the damage marking information of the discharging power transistor to the external charger so as to indicate the external charger to carry out charging prohibition operation.
3. The method of claim 1, after determining that a discharge power transistor of the battery pack is defective, further comprising:
and generating prompt information.
4. The method of claim 3, wherein the alert message comprises a voice alert message and/or a light alert message.
5. A battery pack detection device, comprising:
the first voltage value acquisition module is used for providing a disconnection control signal for a discharge power transistor of the battery pack, providing a connection control signal for a switching element in the current detection loop, and acquiring a first voltage value U1 at a second end of the switching element in the current detection loop;
the second voltage value acquisition module is used for providing a conduction control signal for a discharge power transistor of the battery pack, providing a conduction control signal for a switching element in the current detection loop, and acquiring a second voltage value U2 at a second end of the switching element in the current detection loop;
a discharge power transistor state determination module, configured to determine that a discharge power transistor of the battery pack is damaged if a difference between the first voltage value U1 and the second voltage value U2 is smaller than a preset threshold;
the discharging power transistor of the battery pack is connected in series between the grounding end of a battery core of the battery pack and the negative end of a load; the output end of the current detection loop is electrically connected with the detection end of the controller; the input end of the current detection loop is electrically connected with the load negative electrode end; the control end of the switching element of the current detection loop is electrically connected with the detection control end of the current detection loop; the first end of the switching element is electrically connected with the negative load end; and the second end of the switch element is electrically connected with the grounding end of the battery core.
6. The battery pack detection apparatus according to claim 5, further comprising:
a marking module for adding discharge power transistor damage marking information in the controller after determining that a discharge power transistor of the battery pack is damaged;
and the indicating module is used for sending the damage marking information of the discharging power transistor to the external charger when the battery pack is connected with the external charger so as to indicate that the external charger prohibits charging operation.
7. The battery pack detection device according to claim 5, further comprising an alert module for generating a prompt message after determining that the discharge power transistor of the battery pack is damaged.
8. A power management system, comprising:
the device comprises a controller, a battery pack and a current detection loop;
the controller performs the method of detecting a battery pack according to any one of claims 1 to 5.
9. The power management system of claim 8, further comprising an alert device for generating a prompt after determining that the discharge power transistor of the battery pack is damaged.
10. The power management system of claim 9, wherein the alert device comprises an indicator light and/or a voice prompt.
CN202011194111.2A 2020-10-30 2020-10-30 Battery pack detection method and device and power management system Pending CN114156960A (en)

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