CN214310816U - Battery pack internal and external total voltage detection system and battery pack - Google Patents
Battery pack internal and external total voltage detection system and battery pack Download PDFInfo
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- CN214310816U CN214310816U CN202023202966.3U CN202023202966U CN214310816U CN 214310816 U CN214310816 U CN 214310816U CN 202023202966 U CN202023202966 U CN 202023202966U CN 214310816 U CN214310816 U CN 214310816U
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Abstract
The embodiment of the utility model provides a battery testing technical field, in particular to inside and outside voltage detection system of group battery and group battery. The utility model provides an inside and outside voltage detection system of group battery and group battery, detecting system includes: the device comprises a first switch unit, a pre-charging unit, a second switch unit, a detection unit, a voltage detection unit and a control unit; the detection unit one end is connected at the second end of pre-charging unit, the other end is connected at the second end of group battery, voltage detection unit and detection unit are parallelly connected, and voltage detection unit's output and the control unit are connected, when detecting, first switch unit and second switch unit of closure earlier, control unit obtains inside total voltage according to voltage detection unit's output signal, close second switch unit afterwards, control unit obtains outside total voltage according to voltage detection unit's output signal, this detection mode obtains the inside and outside total voltage of group battery through detecting all the way, the circuit is succinct reliable, the cost is lower.
Description
Technical Field
The embodiment of the utility model provides a battery testing technical field, in particular to inside and outside voltage detection system of group battery and group battery.
Background
In a new energy electric vehicle battery or an energy storage battery system, the total voltage inside and outside the battery pack needs to be monitored in real time for safety. Once the internal total voltage or the external total voltage of the battery pack is abnormal, the battery system needs to give an alarm to a user in time and cut off the power output of the battery.
The power output of the battery is cut off by a main relay, generally, the voltage from the battery pack to the main relay is the total voltage in the battery pack, and the voltage passing through the main relay is the total voltage outside the battery pack. Because the new energy electric vehicle battery or the energy storage battery system has a large capacitive load, the main relay is connected with a current-limiting pre-charging resistor and a pre-charging relay in parallel, the pre-charging relay is closed before the main relay is closed, and the battery pack charges the external capacitive load through the current-limiting pre-charging resistor.
Normally, the total internal voltage is the actual voltage of the battery, and there is a safety risk once the voltage exceeds or falls below the rated range. Normally, the total external voltage is zero before the main or pre-charge relay is not closed, and equal or close to the total internal voltage after the relay is closed, and if once the total external voltage is much less than the total internal voltage, the external load has a problem.
The current technology for detecting the total voltage inside and outside the battery pack needs two detection modules. On the one hand, the internal total voltage sampling line of the battery pack is connected to the detection module, the internal total voltage of the battery pack is calculated through the voltage division of the internal circuit of the module, on the other hand, the external total voltage sampling line of the battery pack is connected to the other path of detection module, and the external total voltage of the battery pack is calculated through the voltage division of the internal circuit of the module. However, this detection method is complicated and costly.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect of prior art, the embodiment of the utility model provides a main technical problem who solves provides inside and outside total voltage detection system of group battery and group battery, and detection mode is simple, installation cost is lower.
In order to solve the above technical problem, the utility model discloses a technical scheme that embodiment adopted is: provided is a system for detecting total voltage inside and outside a battery pack, including: the first switch unit, the pre-charging unit, the second switch unit, the detection unit, the voltage detection unit and the control unit: the first end of the first switch unit is connected with the first end of the battery pack, the second end of the first switch unit is connected with the first end of a load, the second end of the load is connected with the second end of the battery pack, and the first switch unit is used for controlling the battery pack to normally supply power to the outside; the first end of the pre-charging unit is connected with the first end of the battery pack, the second end of the pre-charging unit is connected with the first end of the second switch unit, the second end of the second switch unit is connected with the first end of the load, and the second switch unit is used for controlling the battery pack to pre-charge and supply power to the outside; the first end of the detection unit is connected with the second end of the pre-charging unit, and the second end of the detection unit is connected with the second end of the battery pack; the first end of the voltage detection unit is connected with the first end of the detection unit, the second end of the voltage detection unit is connected with the second end of the detection unit, the third end of the voltage detection unit is connected with the control unit, and the voltage detection unit is used for detecting the voltage drop at the two ends of the detection unit, converting the voltage drop into an output signal and outputting the output signal to the control unit; the control unit is respectively connected with the third end of the first switch unit and the third end of the second switch unit, and is used for obtaining the total internal voltage and the total external voltage of the battery pack according to the output signal and controlling the first switch unit and the second switch unit to be closed; wherein the internal total voltage is a voltage between a first end of the battery pack and a second end of the battery pack, and the external total voltage is a voltage between a second end of the first switching unit and the second end of the battery pack.
In some embodiments, the system for detecting the total voltage inside and outside the battery pack further comprises a voltage dividing unit; the voltage dividing unit is connected between the second end of the pre-charging unit and the first end of the detection unit in series, the first end of the voltage dividing unit is connected with the second end of the pre-charging unit, and the second end of the voltage dividing unit is connected with the first end of the detection unit.
In some embodiments, the voltage dividing unit includes at least one resistor connected in series.
In some embodiments, the pre-charge unit is a pre-charge resistor, and the detection unit is a detection resistor.
In some embodiments, the voltage detection unit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an operational amplifier; the resistance value of the first resistor is equal to that of the fourth resistor, the resistance value of the second resistor is equal to that of the fifth resistor, and the resistance value of the third resistor is equal to that of the sixth resistor; a first end of the first resistor is connected with a first end of the detection unit, a second end of the first resistor is connected with a first end of the third resistor, a second end of the third resistor is respectively connected with a non-inverting input end of the operational amplifier and a first end of the fifth resistor, and a second end of the fifth resistor is grounded; a first end of the second resistor is connected with a second end of the detection unit, a second end of the second resistor is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with an inverting input end of the operational amplifier and a first end of the sixth resistor, and a second end of the sixth resistor is connected with an output end of the operational amplifier; the output end of the operational amplifier is connected with the control unit.
In some embodiments, the voltage detection unit further includes a first capacitor, a second capacitor, a seventh resistor, and a third capacitor; one end of the first capacitor is connected to the first end of the first resistor, and the other end of the first capacitor is connected to the first end of the second resistor; one end of the second capacitor is connected to the first end of the third resistor, and the other end of the second capacitor is connected to the first end of the fourth resistor; the seventh resistor and the third capacitor are connected in series between the second end of the sixth resistor and the output end of the operational amplifier, wherein one end of the third capacitor is connected with the second end of the sixth resistor, the other end of the third capacitor is respectively connected with one end of the seventh resistor and the control unit, and the other end of the seventh resistor is connected with the output end of the operational amplifier; the first capacitor, the second capacitor, the seventh resistor and the third capacitor are used for filtering, and the seventh resistor is also used for limiting the output current of the operational amplifier.
In some embodiments, the voltage detection unit further includes a zener diode; the cathode of the voltage stabilizing diode is connected to the second end of the first resistor, and the anode of the voltage stabilizing diode is connected to the second end of the second resistor.
In some embodiments, the first switching unit includes a main relay, a first current limiting resistor, a second current limiting resistor, and a first transistor; the first end of the main relay is connected with the first end of the battery pack, the second end of the main relay is connected with the first end of the load, the third end of the main relay is connected with the power supply, the fourth end of the main relay is connected with one end of the first current-limiting resistor, the other end of the first current-limiting resistor is connected with the collector electrode of the first triode, one end of the second current-limiting resistor is connected with the control unit, the other end of the second current-limiting resistor is connected with the base electrode of the first triode, and the emitter electrode of the first triode is grounded.
In some embodiments, the second switching unit includes a pre-charge relay, a third current limiting resistor, a fourth current limiting resistor, and a second transistor; the first end of the pre-charging relay is connected with the second end of the pre-charging unit, the second end of the pre-charging relay is connected with the first end of the load, the third end of the pre-charging relay is connected with the power supply, the fourth end of the pre-charging relay is connected with one end of a third current-limiting resistor, the other end of the third current-limiting resistor is connected with the collector electrode of the second triode, one end of a fourth current-limiting resistor is connected with the control unit, the other end of the fourth current-limiting resistor is connected with the base electrode of the second triode, and the emitter electrode of the second triode is grounded.
In order to solve the above technical problem, an embodiment of the present invention further provides a battery pack, including the battery pack internal and external total voltage detection system according to any one of the above first aspect.
The utility model discloses embodiment's beneficial effect is: be different from prior art's condition, the utility model provides an inside and outside voltage detection system of group battery and group battery, detecting system includes: the device comprises a first switch unit, a pre-charging unit, a second switch unit, a detection unit, a voltage detection unit and a control unit; the detection unit one end is connected at the second end of pre-charging unit, the other end is connected at the second end of group battery, voltage detection unit and detection unit are parallelly connected, and voltage detection unit's output and the control unit are connected, when detecting, first switch unit and second switch unit of closure earlier, control unit obtains inside total voltage according to voltage detection unit's output signal, close second switch unit afterwards, control unit obtains outside total voltage according to voltage detection unit's output signal, this detection mode obtains the inside and outside total voltage of group battery through detecting all the way, the circuit is succinct reliable, the cost is lower.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural block diagram of a system for detecting total voltage inside and outside a battery pack according to an embodiment of the present invention;
fig. 2 is a schematic structural block diagram of another system for detecting total voltage inside and outside a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a junction circuit structure of a system for detecting total voltage inside and outside a battery pack according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the invention can be combined with each other and are within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a structural block diagram of a system for detecting total voltage inside and outside a battery pack according to an embodiment of the present invention, where the system 100 for detecting total voltage inside and outside a battery pack includes: a first switching unit 10, a precharge unit 20, a second switching unit 30, a detection unit 40, a voltage detection unit 50, and a control unit 60; a first end of the first switch unit 10 is connected to a first end of the battery pack 200, a second end of the first switch unit 10 is connected to a first end of the load 300, a second end of the load 300 is connected to a second end of the battery pack 200, and the first switch unit 10 is used for controlling the battery pack 200 to normally supply power to the outside; a first end of the pre-charging unit 20 is connected to a first end of the battery pack 200, a second end of the pre-charging unit 20 is connected to a first end of a second switching unit 30, a second end of the second switching unit 30 is connected to a first end of the load 300, and the second switching unit 30 is used for controlling the battery pack 200 to pre-charge and supply power to the outside; the first end of the detection unit 40 is connected to the second end of the pre-charging unit 20, and the second end of the detection unit 40 is connected to the second end of the battery pack 200; a first end of the voltage detection unit 50 is connected to a first end of the detection unit 40, a second end of the voltage detection unit 50 is connected to a second end of the detection unit 40, a third end of the voltage detection unit 50 is connected to the control unit 60, and the voltage detection unit 50 is configured to detect a voltage drop across the detection unit 40, convert the voltage drop into an output signal, and output the output signal to the control unit 60; the control unit 60 is respectively connected to the third terminal of the first switch unit 10 and the third terminal of the second switch unit 30, and the control unit 60 is configured to obtain the total internal voltage and the total external voltage of the battery pack 200 according to the output signal and control the first switch unit 10 and the second switch unit 30 to be closed; the internal total voltage is a voltage between the first terminal of the battery pack 200 and the second terminal of the battery pack 200, and the external total voltage is a voltage between the second terminal of the first switching unit 10 and the second terminal of the battery pack 200.
In the system 100 for detecting the total voltage inside and outside the battery pack 200 according to the present invention, generally, the first end of the battery pack 200 is the positive electrode of the battery pack 200, and the second end of the battery pack 200 is the negative electrode of the battery pack 200, first, the first switch unit 10 and the second switch unit 30 are turned off, the battery pack 200, the pre-charge unit 20 and the detection unit 40 form a loop, the battery pack 200 is discharged, and at this time, the voltage detection unit 50 detects the first voltage drop across the detection unit 40, and converts the first voltage drop into a first output signal to be output to the control unit 60, the control unit 60 obtains the total internal voltage of the battery pack 200 according to the first output signal, then, the second switching unit 30 is closed, the voltage detecting unit 50 detects a second voltage drop across the detecting unit 40, and converts the second voltage drop into a second output signal to output to the control unit 60, and the control unit 60 obtains the total external voltage of the battery pack 200 according to the second output signal. Meanwhile, in the system, the control unit 60 may determine whether the load 300 is abnormal according to the obtained external total voltage, and if the external total voltage is always lower than the preset value, the control unit may determine that the load 300 is abnormal, and then open the second switching unit 20, and if the external total voltage is higher than the preset value, the control unit may determine that the load 300 is normal, and then close the first switching unit 10 and open the second switching unit 30. The system 100 for detecting the total voltage inside and outside the battery pack obtains the total voltage inside and outside the battery pack 200 through one-way detection, reduces the usage amount of components of a detection circuit, has simple and reliable circuits, reduces the production cost, and improves the production efficiency.
In some embodiments, referring to fig. 3, the precharging unit 20 is a precharging resistor Rx, and the detecting unit 40 is a detecting resistor Ry.
In some of these embodiments, control unit 30 may employ the STM8 family, the STM32 family, or other suitable micro control unit for receiving and outputting data. In practical applications, the control unit 30 can be set according to practical requirements, and the limitation in the embodiment of the present invention is not required to be restricted herein.
In general, the voltage detection unit 50 can only detect low voltage and is easily damaged when detecting high voltage, and in order to protect the voltage detection unit 50, in some embodiments, referring to fig. 2, the internal and external total voltage detection system 100 of the battery pack 200 further includes a voltage division unit 70; the voltage dividing unit 70 is connected in series between the second end of the pre-charging unit 20 and the first end of the detecting unit 40, the first end of the voltage dividing unit 70 is connected to the second end of the pre-charging unit 20, and the second end of the voltage dividing unit is connected to the first end of the detecting unit 40. Referring to fig. 3, the voltage dividing unit 70 includes at least one voltage dividing resistor Rz connected in series, and generally, the resistance value of the voltage dividing resistor Rz is M Ω level, and the resistance value of the detection resistor Ry is K Ω level, so that the voltage drop across the detection resistor Ry is small voltage, and the voltage detection unit 50 can easily detect the voltage drop.
In some embodiments, referring to fig. 3, the voltage detection unit 50 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an operational amplifier; the resistance value of the first resistor R1 is equal to that of the fourth resistor R4, the resistance value of the second resistor R2 is equal to that of the fifth resistor R5, and the resistance value of the third resistor R3 is equal to that of the sixth resistor R6; a first end of the first resistor R1 is connected with a first end of the detection resistor Ry, a second end of the first resistor R1 is connected with a first end of the third resistor R3, a second end of the third resistor R3 is respectively connected with a non-inverting input end of the operational amplifier and a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is grounded; a first end of the second resistor R2 is connected to a second end of the detection resistor Ry, a second end of the second resistor R2 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is respectively connected to an inverting input terminal of the operational amplifier and a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is connected to an output terminal of the operational amplifier; the output of the operational amplifier is connected to said control unit 60. The voltage detection unit 50 forms a differential following operational amplifier circuit, which can be used to detect the voltage drop across the detection resistor Ry, and at this time, the relationship between the voltage value Vout output to the control unit 60 and the voltage drop value v (Ry) across the detection resistor Ry is
Vout＝V(Ry)*R6/(R1+R3) Wherein R isyTo detect the resistance of the resistor Ry, R6Is the resistance of the sixth resistor R6, R1Is the resistance value of the first resistor R1, R3The resistance value of the third resistor R3, and accordingly, the control unit 60 can obtain the voltage drop across the detection resistor Ry according to the output voltage of the voltage detection unit 50. In practical application, the quantity of voltage detection unit 50's resistance and the resistance of resistance can set up according to actual need, and simultaneously, voltage detection unit 50 also can be other all suitable voltage detection circuit, need not be here restricted to the embodiment of the utility model provides an in the limit.
In order to make the output signal of the voltage detecting unit 50 more accurate, so that the control unit 60 can more accurately obtain the voltage drop across the detecting unit 40, in some embodiments, the voltage detecting unit 50 further includes a first capacitor C1, a second capacitor C2, a seventh resistor R7, and a third capacitor C3; one end of the first capacitor C1 is connected to the first end of the first resistor R1, and the other end of the first capacitor C1 is connected to the first end of the second resistor R2; one end of the second capacitor C2 is connected to the first end of the third resistor R3, and the other end of the second capacitor C2 is connected to the first end of the fourth resistor R4; the seventh resistor R7 and the third capacitor C3 are connected in series between the second end of the sixth resistor R6 and the output end of the operational amplifier, wherein one end of the third capacitor C3 is connected to the second end of the sixth resistor R6, the other end of the third capacitor C3 is connected to one end of the seventh resistor R7 and the control unit 60, and the other end of the seventh resistor R7 is connected to the output end of the operational amplifier; the first capacitor C1, the second capacitor C2, the seventh resistor R7 and the third capacitor C3 are used for filtering, and the seventh resistor R7 is also used for limiting the output current of the operational amplifier. In practical application, the filter circuit can also be any other suitable filter circuit, and the limitation in the embodiment of the present invention is not required to be restricted herein.
In order to protect the voltage detection unit 50, in some embodiments, the voltage detection unit 50 further includes a zener diode ZD 1; the cathode of the zener diode ZD1 is connected to the second end of the first resistor R1, and the anode of the zener diode ZD1 is connected to the second end of the second resistor R2. In practical applications, the voltage detecting unit 50 may also use any other suitable voltage stabilizing circuit, and the limitation in the embodiment of the present invention is not required herein.
In some embodiments, the first switching unit 10 includes a main relay RLY1, a first current limiting resistor Rp1, a second current limiting resistor Rp2, and a first transistor Q1; the first end of the main relay RLY1 is connected with the first end of the battery pack 200, the second end of the main relay RLY1 is connected with the first end of the load 300, the third end of the main relay RLY1 is connected with the power supply 5V, the fourth end of the main relay RLY1 is connected with one end of a first current-limiting resistor Rp1, the other end of the first current-limiting resistor Rp1 is connected with the collector of a first triode Q1, one end of a second current-limiting resistor Rp2 is connected with the control unit 60, the other end of the second current-limiting resistor Rp2 is connected with the base of a first triode Q1, and the emitter of the first triode Q1 is grounded. Specifically, the movable contact of the main relay RLY1 is connected with the positive electrode of the battery pack 200, the stationary contact of the main relay RLY1 is connected with the first end of the load 300, one end of the coil side of the main relay RLY1 is connected with the power supply 5V, and the other end of the coil side of the main relay RLY1 is connected with one end of the first current limiting resistor Rp 1. In practical application, the quantity of current-limiting resistance can set up according to actual need, need not be here restricted in the embodiment of the utility model provides an in injecing.
In some embodiments, the second switching unit 30 includes a pre-charge relay RLY2, a third current-limiting resistor Rp3, a fourth current-limiting resistor Rp4, and a second transistor Q2; the first end of the pre-charging relay RLY2 is connected with the second end of the pre-charging unit 20, the second end of the pre-charging relay RLY2 is connected with the first end of the load 300, the third end of the pre-charging relay RLY2 is connected with a power supply, the fourth end of the pre-charging relay RLY2 is connected with one end of a third current-limiting resistor Rp3, the other end of the third current-limiting resistor Rp3 is connected with the collector of a second triode Q2, one end of a fourth current-limiting resistor Rp4 is connected with the control unit 60, the other end of the fourth current-limiting resistor Rp4 is connected with the base of a second triode Q2, and the emitter of the second triode Q2 is grounded. Specifically, the movable contact of the pre-charge relay RLY2 is connected to the second terminal of the pre-charge unit 20, the stationary contact of the pre-charge relay RLY2 is connected to the first terminal of the load 300, one terminal of the coil side of the pre-charge relay RLY2 is connected to the power supply, and the other terminal of the coil side of the pre-charge relay RLY2 is connected to one terminal of the third current limiting resistor Rp 3.
The following describes in detail the detection process of the system 100 for detecting total voltage inside and outside a battery pack according to an embodiment of the present invention with reference to the specific embodiment shown in fig. 3. In this embodiment, the voltage dividing unit 70 includes five voltage dividing resistors connected in series, and the rest of the circuit connections are described in any one of the above, and will not be described herein again. First, the control unit 60 outputs a low level to the first switch unit 10 and the second switch unit 30, respectively, at this time, the first transistor Q1 and the second transistor Q2 are not turned on, the main relay RLY1 and the pre-charge relay RLY2 are in an off state, the battery pack 200 is discharged through the pre-charge resistor Rx, the voltage dividing unit 70 and the detection resistor Ry, the control unit 60 obtains a first voltage drop value V1 at both ends of the detection resistor Ry according to an output signal of the voltage detection unit 50, and obtains a first voltage drop value V1 at both ends of the detection resistor RyThe total internal voltage U1 of the battery pack 200 is V1/Ry*(Rx+Rz+Ry) Wherein R isxIs the resistance value of the pre-charge resistor Rx, RyTo detect the resistance of the resistor Ry, RzIs the total resistance value of the voltage dividing unit 70; then, the control unit 60 outputs a high level to the second switching unit 30, at this time, the second transistor Q2 is turned on, the pre-charge relay RLY2 is in a closed state, the control unit 60 obtains a second voltage drop value V2 across the detection resistor Ry according to the output signal of the voltage detection unit 50, and obtains the total external voltage U2 of the battery pack 200 as V2/Ry*(Rz+Ry) Wherein R isyTo detect the resistance of the resistor Ry, RzIs the total resistance value of the voltage dividing unit 70. Further, the total external voltage for closing one battery pack may be preset to be the turn-on voltage; if the total external voltage U2 is greater than or equal to the turn-on voltage, the first switching unit 10 is controlled to be closed and the second switching unit 30 is controlled to be opened; if the total external voltage U2 is less than the turn-on voltage, the second switching unit 30 is controlled to be turned off, and an abnormal condition of the load 300 is determined, and an alarm is given to the user. Generally, when the load is normal, the total internal voltage and the total external voltage of the battery pack are equal, so the starting voltage may be set to the detected total internal voltage of the battery pack.
In order to solve the above technical problem, the embodiment of the present invention further provides a battery pack 200, including the battery pack internal and external total voltage detection system 100 as described in any one of the above. In the battery pack 200, the first switch unit 10 and the second switch unit 30 are controlled to be turned off to obtain a first voltage drop of the detection unit 40, so as to obtain the total internal voltage of the battery pack 200; then, the second switch unit 30 is controlled to be closed, so that the battery pack 200 precharges the load 300, a second voltage drop of the detection unit 40 is obtained, and the total external voltage of the battery pack 200 is obtained. Further, whether the load 300 is normal or not may be determined according to the total external voltage of the battery pack 200, and if the total external voltage is higher than a preset voltage value, it is normal and the first switching unit 10 is turned on, and if the total external voltage is lower than the preset voltage value, it is abnormal and the second switching unit 30 is turned off, and an alarm is given to a user.
The utility model provides an inside and outside voltage detection system of group battery and group battery, detecting system includes: the device comprises a first switch unit, a pre-charging unit, a second switch unit, a detection unit, a voltage detection unit and a control unit; the detection unit one end is connected at the second end of pre-charging unit, the other end is connected at the second end of group battery, voltage detection unit and detection unit are parallelly connected, and voltage detection unit's output and the control unit are connected, when detecting, first switch unit and second switch unit of closure earlier, control unit obtains inside total voltage according to voltage detection unit's output signal, close second switch unit afterwards, control unit obtains outside total voltage according to voltage detection unit's output signal, this detection mode obtains the inside and outside total voltage of group battery through detecting all the way, the circuit is succinct reliable, the cost is lower.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A system for detecting the total voltage inside and outside a battery pack, comprising: the first switch unit, the pre-charging unit, the second switch unit, the detection unit, the voltage detection unit and the control unit:
the first end of the first switch unit is connected with the first end of the battery pack, the second end of the first switch unit is connected with the first end of a load, the second end of the load is connected with the second end of the battery pack, and the first switch unit is used for controlling the battery pack to normally supply power to the outside;
the first end of the pre-charging unit is connected with the first end of the battery pack, the second end of the pre-charging unit is connected with the first end of the second switch unit, the second end of the second switch unit is connected with the first end of the load, and the second switch unit is used for controlling the battery pack to pre-charge and supply power to the outside;
the first end of the detection unit is connected with the second end of the pre-charging unit, and the second end of the detection unit is connected with the second end of the battery pack;
the first end of the voltage detection unit is connected with the first end of the detection unit, the second end of the voltage detection unit is connected with the second end of the detection unit, the third end of the voltage detection unit is connected with the control unit, and the voltage detection unit is used for detecting the voltage drop at the two ends of the detection unit, converting the voltage drop into an output signal and outputting the output signal to the control unit;
the control unit is respectively connected with the third end of the first switch unit and the third end of the second switch unit, and is used for obtaining the total internal voltage and the total external voltage of the battery pack according to the output signal and controlling the first switch unit and the second switch unit to be closed;
wherein the internal total voltage is a voltage between a first end of the battery pack and a second end of the battery pack, and the external total voltage is a voltage between a second end of the first switching unit and the second end of the battery pack.
2. The system for detecting the total voltage inside and outside the battery pack according to claim 1, further comprising a voltage dividing unit;
the voltage dividing unit is connected between the second end of the pre-charging unit and the first end of the detection unit in series, the first end of the voltage dividing unit is connected with the second end of the pre-charging unit, and the second end of the voltage dividing unit is connected with the first end of the detection unit.
3. The system for detecting the total voltage inside and outside a battery pack according to claim 2, wherein said voltage dividing unit includes at least one resistor connected in series.
4. The system for detecting the total voltage inside or outside the battery pack according to claim 3, wherein the pre-charging unit is a pre-charging resistor, and the detecting unit is a detecting resistor.
5. The system for detecting total voltage inside or outside a battery pack according to any one of claims 1 to 4, wherein the voltage detecting unit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an operational amplifier;
the resistance value of the first resistor is equal to that of the fourth resistor, the resistance value of the second resistor is equal to that of the fifth resistor, and the resistance value of the third resistor is equal to that of the sixth resistor;
a first end of the first resistor is connected with a first end of the detection unit, a second end of the first resistor is connected with a first end of the third resistor, a second end of the third resistor is respectively connected with a non-inverting input end of the operational amplifier and a first end of the fifth resistor, and a second end of the fifth resistor is grounded;
a first end of the second resistor is connected with a second end of the detection unit, a second end of the second resistor is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with an inverting input end of the operational amplifier and a first end of the sixth resistor, and a second end of the sixth resistor is connected with an output end of the operational amplifier;
the output end of the operational amplifier is connected with the control unit.
6. The system for detecting the total voltage inside and outside a battery pack according to claim 5, wherein the voltage detection unit further includes a first capacitor, a second capacitor, a seventh resistor, and a third capacitor;
one end of the first capacitor is connected to the first end of the first resistor, and the other end of the first capacitor is connected to the first end of the second resistor;
one end of the second capacitor is connected to the first end of the third resistor, and the other end of the second capacitor is connected to the first end of the fourth resistor;
the seventh resistor and the third capacitor are connected in series between the second end of the sixth resistor and the output end of the operational amplifier, wherein one end of the third capacitor is connected with the second end of the sixth resistor, the other end of the third capacitor is respectively connected with one end of the seventh resistor and the control unit, and the other end of the seventh resistor is connected with the output end of the operational amplifier;
the first capacitor, the second capacitor, the seventh resistor and the third capacitor are used for filtering, and the seventh resistor is also used for limiting the output current of the operational amplifier.
7. The system for detecting the total voltage inside and outside the battery pack according to claim 6, wherein the voltage detection unit further includes a zener diode;
the cathode of the voltage stabilizing diode is connected to the second end of the first resistor, and the anode of the voltage stabilizing diode is connected to the second end of the second resistor.
8. The system for detecting total voltage inside and outside a battery pack according to claim 7, wherein the first switching unit includes a main relay, a first current limiting resistor, a second current limiting resistor, and a first transistor;
the first end of the main relay is connected with the first end of the battery pack, the second end of the main relay is connected with the first end of the load, the third end of the main relay is connected with the power supply, the fourth end of the main relay is connected with one end of the first current-limiting resistor, the other end of the first current-limiting resistor is connected with the collector electrode of the first triode, one end of the second current-limiting resistor is connected with the control unit, the other end of the second current-limiting resistor is connected with the base electrode of the first triode, and the emitter electrode of the first triode is grounded.
9. The system for detecting the total voltage inside and outside the battery pack according to claim 8, wherein the second switching unit includes a pre-charge relay, a third current limiting resistor, a fourth current limiting resistor, and a second transistor;
the first end of the pre-charging relay is connected with the second end of the pre-charging unit, the second end of the pre-charging relay is connected with the first end of the load, the third end of the pre-charging relay is connected with the power supply, the fourth end of the pre-charging relay is connected with one end of a third current-limiting resistor, the other end of the third current-limiting resistor is connected with the collector electrode of the second triode, one end of a fourth current-limiting resistor is connected with the control unit, the other end of the fourth current-limiting resistor is connected with the base electrode of the second triode, and the emitter electrode of the second triode is grounded.
10. A battery pack characterized by comprising a battery pack internal-external total voltage detection system according to any one of claims 1 to 9.
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| CN202023202966.3U CN214310816U (en) | 2020-12-27 | 2020-12-27 | Battery pack internal and external total voltage detection system and battery pack |
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| CN202023202966.3U CN214310816U (en) | 2020-12-27 | 2020-12-27 | Battery pack internal and external total voltage detection system and battery pack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557936A (en) * | 2020-12-27 | 2021-03-26 | 深圳市德兰明海科技有限公司 | Battery pack internal and external total voltage detection system and battery pack |
| US20210111569A1 (en) * | 2019-10-09 | 2021-04-15 | Mobile Tech, Inc. | Systems and method for electronically disconnecting batteries |
-
2020
- 2020-12-27 CN CN202023202966.3U patent/CN214310816U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210111569A1 (en) * | 2019-10-09 | 2021-04-15 | Mobile Tech, Inc. | Systems and method for electronically disconnecting batteries |
| US11870285B2 (en) * | 2019-10-09 | 2024-01-09 | Mobile Tech, Inc. | Systems and method for electronically disconnecting batteries |
| CN112557936A (en) * | 2020-12-27 | 2021-03-26 | 深圳市德兰明海科技有限公司 | Battery pack internal and external total voltage detection system and battery pack |
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