CN218181062U - Internal resistance and voltage measuring device for high-voltage lithium battery pack - Google Patents
Internal resistance and voltage measuring device for high-voltage lithium battery pack Download PDFInfo
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- CN218181062U CN218181062U CN202222569805.0U CN202222569805U CN218181062U CN 218181062 U CN218181062 U CN 218181062U CN 202222569805 U CN202222569805 U CN 202222569805U CN 218181062 U CN218181062 U CN 218181062U
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Abstract
The utility model discloses a high-voltage lithium battery internal resistance and voltage measuring device, which comprises a shell, an anode connecting wire, a cathode connecting wire and a testing circuit board in the shell, wherein the testing circuit board is integrated with a functional module, which comprises a high-voltage protection excitation transmitting module, a high-voltage battery OCV detection module, a high-voltage protection alternating voltage sampling module and an internal resistance calculating module; the high-voltage protection excitation transmitting module comprises a direct-current output unit, a filtering unit and an excitation output unit, wherein the excitation output unit comprises a high-voltage protection unit; the OCV detection module of the high-voltage battery pack comprises a high-voltage attenuation unit; the high-voltage protection alternating voltage sampling module comprises a high-voltage protection unit and a filtering, amplifying and detecting unit; the internal resistance calculation module comprises an AD conversion unit and an MCU. The utility model discloses can test 1500V open circuit voltage's at most power battery group, under the effect of high-pressure protection unit, the inside excitation of device and sampling module can not damaged by the instantaneous high pressure of 1500V, and still can keep measurement function and measurement accuracy.
Description
Technical Field
The utility model relates to a lithium cell measuring device technical field, in particular to high pressure lithium cell internal resistance of group and voltage measurement device.
Background
The large-scale electric vehicle often needs a plurality of power lithium batteries to be connected in series to form a battery pack for use, when hundreds of lithium batteries are connected in series, the total voltage reaches kilovolt or more, and the measurement of the internal resistance and the voltage of the lithium battery pack is a necessary procedure in the production process.
At present, a testing instrument capable of testing internal resistance and voltage of a power lithium battery simultaneously exists in the market, but most of lithium battery packs formed by lithium batteries in series connection and total voltage of the lithium battery packs is more than 1000V and cannot be measured, the lithium battery packs can only be measured after being split, and production efficiency is greatly reduced. The high voltage referred to in the utility model is in the interval of 1000V to 1500V.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a high-voltage lithium cell internal resistance of group and voltage measurement device.
The utility model adopts the following scheme: the utility model provides an internal resistance of high voltage lithium cell group and voltage measurement device, includes casing, anodal connecting wire, negative pole connecting wire and sets up the test circuit board in the casing, its characterized in that: the testing circuit board is integrated with a functional module which comprises a high-voltage protection excitation transmitting module, a high-voltage battery pack OCV (open circuit voltage) detecting module, a high-voltage protection alternating voltage sampling module and an internal resistance calculating module;
the high-voltage protection excitation emission module is used for enabling the whole circuit to emit 1KHZ constant-current test excitation under the condition of receiving high-voltage direct-current impact; the high-voltage protection excitation transmitting module comprises a direct-current output unit, a filtering unit and an excitation output unit, and the excitation output unit comprises a high-voltage protection unit;
the high-voltage battery pack OCV detection module is used for detecting the battery pack open-circuit voltage of high voltage; the high-voltage battery pack OCV detection module comprises a high-voltage attenuation unit;
the high-voltage protection alternating voltage sampling module is used for enabling the whole circuit to normally detect alternating voltage generated at two ends of the battery pack by alternating current excitation under high-voltage direct current instantaneous impact; the high-voltage protection alternating voltage sampling module comprises a high-voltage protection unit and a filtering, amplifying and detecting unit;
the internal resistance calculation module is used for calculating the internal resistance of the battery pack and comprises an AD conversion unit and an MCU.
Preferably, the high-voltage protection unit at the output end of the high-voltage protection excitation emission module enables the whole circuit to emit 1KHZ constant-current test excitation under the condition of receiving the highest 1500V direct-current impact; the direct current source output unit is characterized in that a reference chip of the direct current source output unit outputs a direct current voltage which is changed into a 1KHZ square wave under the action of a control chip, then the direct current voltage is changed into sine SINOUT through a filtering unit and is input into an excitation output unit, the excitation output unit comprises a high-voltage protection unit, and the high-voltage protection unit comprises a voltage division bridge and a TVS tube.
Preferably, the high-voltage battery pack OCV detection module takes SENSE + and SENSE-as input ends, the high-voltage attenuation unit performs proportional attenuation through a high-power voltage-dividing resistor, and the high-voltage attenuation unit can detect the battery pack open-circuit voltage of 1500V at most by controlling the conduction of a relay and then sending the battery pack open-circuit voltage to an operational amplifier.
Preferably, the input end of the high-voltage protection alternating voltage sampling module is connected to SENSE + and SENSE-, the high-voltage protection unit comprises a ground charging and discharging voltage-dividing bridge and a TVS (transient voltage suppressor), and the signal is filtered, amplified and detected by the detection unit, and the processed sampling signal is sent to the internal resistance calculation module.
Preferably, the internal resistance calculation module further includes a signal isolation and shaping unit, and the internal resistance calculation module receives the analog detection signal, passes through the signal isolation and shaping unit via the AD conversion unit, and enters the MCU unit to calculate the internal resistance value.
Preferably, the MCU is of the model STM32f207ZET6.
Compared with the prior art, the utility model discloses there is following beneficial effect: when measuring internal resistance of high pressure power lithium cell group and open circuit voltage, when test probe contact battery group both ends, inside battery group open circuit voltage passed through the probe and applyed testing arrangement in the twinkling of an eye, the utility model discloses under the prerequisite of guaranteeing power lithium cell internal resistance voltage simultaneous measurement, can test 1500V open circuit voltage's power battery group at most, under the effect of high-pressure protection unit, the inside excitation of device and sampling module can not damaged by the instantaneous high pressure of 1500V, and still can keep measurement function and measurement accuracy, end the test, when the probe left the battery group of being surveyed, remaining high pressure also can be put down gradually under the high-pressure protection circuit effect in the device, avoid the bad device of instantaneous high pressure drop loss, this measurement of having satisfied most group batteries, help battery manufacturer has improved production efficiency greatly.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic diagram of a partial circuit structure of the high-voltage protection excitation transmitting module.
Fig. 3 is a schematic diagram of a partial circuit structure of the high-voltage protection excitation transmitting module.
Fig. 4 is a schematic circuit diagram of the OCV detection module of the high-voltage battery pack.
Fig. 5 is a schematic circuit diagram of the high-voltage protection ac voltage sampling module.
Fig. 6 is a schematic circuit diagram of the internal resistance calculation module.
Detailed Description
As shown in the schematic diagram of fig. 1, the utility model provides a high-voltage lithium battery internal resistance and voltage measuring device, which comprises a shell, an anode connecting wire, a cathode connecting wire and a test circuit board arranged in the shell, wherein the test circuit board is integrated with a functional module, which comprises a high-voltage protection excitation transmitting module, a high-voltage battery OCV detecting module, a high-voltage protection alternating voltage sampling module and an internal resistance calculating module; wherein I represents alternating current excitation, the alternating current excitation is transmitted to the battery pack to be tested, and the alternating current voltage sampling circuit collects alternating current voltage generated by the excitation at two ends of the battery pack. The high voltage referred to in the utility model is in the interval of 1000V to 1500V.
Fig. 2 and fig. 3 together form a high-voltage protection excitation transmitting module, the high-voltage protection excitation transmitting module includes a direct current output unit, a filtering unit and an excitation output unit, and the excitation output unit includes a high-voltage protection unit; the high-voltage protection unit with the high-voltage protection excitation transmitting module and the output end enables the whole circuit to receive the maximum 1500V direct current impact and emit 1KHZ constant-current test excitation.
The direct current source output unit has the advantages that the direct current voltage output by a reference chip is changed into 1KHZ square waves under the action of a control chip, the 1KHZ square waves are changed into sine SINOUT through a filtering unit and then input into an excitation output unit, the excitation output unit comprises a high-voltage protection unit, the high-voltage protection unit comprises a voltage division bridge, a TVS (transient voltage suppressor) tube and the like, instantaneous energy impact can be equally divided when the voltage division bridge is placed at the position of a circuit in cooperation with the TVS, the excitation output unit can work normally without saturation when being matched with a reasonable resistance value selection mode, the U38 of the excitation output unit is operated to form a closed loop when an object to be detected is connected into an excitation output end, reverse amplification is formed, and the output current is kept constant on the premise of no saturation.
Fig. 4 is a structural view illustrating a high-voltage battery pack OCV detection module including a high-voltage damping unit; the SENSE + and the SENSE-are input ends, the high-voltage attenuation unit performs proportional attenuation through a high-power divider resistor, and the high-voltage attenuation unit can detect the maximum 1500V open-circuit voltage of the battery pack by controlling the conduction of a relay and then sending the high-voltage attenuation unit to an operational amplifier.
FIG. 5 is a high voltage protection AC voltage sampling module including a high voltage protection unit and a filtering amplification detection unit; the input end is also connected to SENSE + and SENSE-, the high-voltage protection part comprises a ground charging and discharging voltage-dividing bridge and a TVS tube, then the signal is filtered, amplified and detected by the wave detection unit, and the processed sampling signal is sent to the internal resistance calculation module. The whole circuit can normally detect the alternating voltage generated at two ends of the battery pack by alternating current excitation under 1500V direct current transient impact.
Fig. 6 shows that the internal resistance calculation module is used for calculating the internal resistance of the battery pack, and the internal resistance calculation module includes an AD conversion unit and an MCU. The internal resistance calculation module also comprises a signal isolation and shaping unit, and the internal resistance calculation module receives the analog detection signal, passes through the signal isolation and shaping unit through the AD conversion unit and then enters the MCU unit to calculate the internal resistance value. The model of the MCU is preferably STM32f207ZET6.
The working principle is as follows: the high-voltage direct current at the two ends of the battery pack can be connected with the high-voltage protection alternating voltage sampling module and the high-voltage battery pack OCV detection module through the test wires, and the high-voltage protection units are arranged in the two circuits, so that the internal signal transmitting and sampling circuit can normally work under 1500V high voltage. The excitation transmitting module transmits alternating current test excitation to the battery pack, the alternating current voltage sampling module samples alternating current voltage of the battery pack, and the high-voltage battery pack OCV detection module simultaneously acquires voltages at two ends of the battery pack and simultaneously displays a test result. On the premise of ensuring the testing function and precision, the direct current voltage up to 1500V can be tested.
The foregoing description, taken in conjunction with the drawings, illustrate specific embodiments herein sufficiently to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full breadth of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another element without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a structure, device, or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate. Herein, the term "plurality" means two or more, unless otherwise specified.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides an internal resistance of high voltage lithium cell group and voltage measurement device, includes casing, anodal connecting wire, negative pole connecting wire and sets up the test circuit board in the casing, its characterized in that: the testing circuit board is integrated with functional modules, and the functional modules comprise a high-voltage protection excitation transmitting module, a high-voltage battery pack OCV detection module, a high-voltage protection alternating-current voltage sampling module and an internal resistance calculation module;
the high-voltage protection excitation emission module is used for enabling the whole circuit to emit 1KHZ constant-current test excitation under the condition of receiving high-voltage direct-current impact; the high-voltage protection excitation transmitting module comprises a direct-current output unit, a filtering unit and an excitation output unit, and the excitation output unit comprises a high-voltage protection unit;
the high-voltage battery pack OCV detection module is used for detecting the open-circuit voltage of the high-voltage battery pack; the high-voltage battery pack OCV detection module comprises a high-voltage attenuation unit;
the high-voltage protection alternating voltage sampling module is used for enabling the whole circuit to normally detect alternating voltage generated at two ends of the battery pack by alternating current excitation under high-voltage direct current instantaneous impact; the high-voltage protection alternating voltage sampling module comprises a high-voltage protection unit and a filtering, amplifying and detecting unit;
the internal resistance calculation module is used for calculating the internal resistance of the battery pack and comprises an AD conversion unit and an MCU.
2. The apparatus for measuring internal resistance and voltage of a high voltage lithium battery pack according to claim 1, wherein: the high-voltage protection unit at the output end of the high-voltage protection excitation emission module enables the whole circuit to emit 1KHZ constant-current test excitation under the condition of receiving the maximum 1500V direct-current impact; the direct current output unit is characterized in that the direct current voltage output by a reference chip of the direct current output unit is changed into 1KHZ square wave under the action of a control chip, then is changed into sine SINOUT through a filtering unit and is input into an excitation output unit, the excitation output unit comprises a high-voltage protection unit, and the high-voltage protection unit comprises a voltage division bridge and a TVS (transient voltage suppressor).
3. The apparatus for measuring internal resistance and voltage of a high voltage lithium battery pack according to claim 1, wherein: the OCV detection module of the high-voltage battery pack takes SENSE + and SENSE-as input ends, the high-voltage attenuation unit performs proportional attenuation through a high-power divider resistor, and the high-voltage attenuation unit can detect the maximum 1500V open-circuit voltage of the battery pack by controlling the conduction of a relay and then sending the high-voltage attenuation unit to an operational amplifier.
4. The apparatus for measuring internal resistance and voltage of a high voltage lithium battery pack according to claim 1, wherein: the input end of the high-voltage protection alternating voltage sampling module is connected to a SENSE + and a SENSE-, the high-voltage protection unit comprises a ground charging and discharging voltage-dividing bridge and a TVS tube, and signals are filtered, amplified and detected by the detecting unit, and the processed sampling signals are sent to the internal resistance calculating module.
5. The apparatus for measuring internal resistance and voltage of a high voltage lithium battery pack according to claim 1, wherein: the internal resistance calculation module further comprises a signal isolation and shaping unit, and the internal resistance calculation module receives the analog detection signal, passes through the signal isolation and shaping unit through the AD conversion unit, and enters the MCU unit to calculate the internal resistance value.
6. The apparatus of claim 1, wherein the apparatus comprises: the model of the MCU is STM32f207ZET6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222569805.0U CN218181062U (en) | 2022-09-27 | 2022-09-27 | Internal resistance and voltage measuring device for high-voltage lithium battery pack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222569805.0U CN218181062U (en) | 2022-09-27 | 2022-09-27 | Internal resistance and voltage measuring device for high-voltage lithium battery pack |
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| CN218181062U true CN218181062U (en) | 2022-12-30 |
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| CN202222569805.0U Active CN218181062U (en) | 2022-09-27 | 2022-09-27 | Internal resistance and voltage measuring device for high-voltage lithium battery pack |
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