CN218938448U - Test circuit and test board of battery management system - Google Patents
Test circuit and test board of battery management system Download PDFInfo
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- CN218938448U CN218938448U CN202223590403.5U CN202223590403U CN218938448U CN 218938448 U CN218938448 U CN 218938448U CN 202223590403 U CN202223590403 U CN 202223590403U CN 218938448 U CN218938448 U CN 218938448U
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Abstract
The utility model discloses a test circuit and a test board of a battery management system. The floating excitation channel comprises a first signal transmission terminal group and a second signal transmission terminal group, and the floating excitation channel is used for generating excitation signals and collecting received sensing signals; the selection module is used for electrically connecting the first signal transmission terminal group of the floating excitation channel with the corresponding terminal group on the battery management system; and electrically connecting the second signal transmission terminal set of the floating excitation channel with a corresponding terminal set on the battery management system, or correspondingly electrically connecting the second signal transmission terminal set of the floating excitation channel with the first signal transmission terminal set of the floating excitation channel adjacent thereto. The technical scheme provided by the embodiment of the utility model realizes the simplification of the detection circuit and improves the detection precision of the battery management system.
Description
Technical Field
The present utility model relates to the field of battery technologies, and in particular, to a test circuit and a test board for a battery management system.
Background
Battery applications in various aspects of production and life, management of batteries requires reliance on a BMS (Battery Management System ). When multiple batteries are connected in series, and high voltage is output, the overall voltage may exceed 100V. The BMS chip needs to monitor the state of each battery at the same time and collect the voltage and other parameters of each battery. The BMS chip needs to be tested before use, and the existing BMS chip testing method has the advantages that high-precision testing and low-precision testing need to be respectively carried out because single-channel voltage of the testing device cannot be changed, and the high-precision testing needs to build a complex testing device, so that testing cost is increased.
Disclosure of Invention
The utility model provides a test circuit and a test board of a battery management system, which are used for solving the problems that high-precision test and low-precision test are required to be respectively carried out, a complex test device is required to be built for the high-precision test, and the test cost is high.
According to an aspect of the present utility model, there is provided a test circuit of a battery management system, comprising:
at least ten floating excitation channels, the floating excitation channels comprising a first signal transmission terminal set and a second signal transmission terminal set, the floating excitation channels for generating excitation signals and collecting received sensing signals;
the selection module is used for electrically connecting the first signal transmission terminal group of the floating excitation channel with a corresponding terminal group on a battery management system; and electrically connecting the second signal transmission terminal group of the floating excitation channel with a corresponding terminal group on the battery management system, or correspondingly and electrically connecting the second signal transmission terminal group of the floating excitation channel with the first signal transmission terminal group of the adjacent floating excitation channel.
Optionally, the first signal transmission terminal group includes a first excitation signal output end and a first sensing signal acquisition end, and the second signal transmission terminal group includes a second excitation signal output end and a second sensing signal acquisition end;
the selection module comprises at least ten switch groups corresponding to the at least ten floating excitation channels one by one, and each switch group comprises:
the first end of the first switch is electrically connected with the corresponding first excitation signal output end, and the second end of the first switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the second switch is electrically connected with the corresponding first sensing signal acquisition end, and the second end of the second switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the third switch is electrically connected with the second excitation signal output end, and the second end of the third switch is electrically connected with a corresponding terminal group on the battery management system;
the first end of the fourth switch is electrically connected with the second sensing signal acquisition end, and the second end of the fourth switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the fifth switch is electrically connected with the second excitation signal output end, and the second end of the fifth switch is electrically connected with the first end of the first switch in the corresponding switch group;
and the first end of the sixth switch is electrically connected with the second sensing signal acquisition end, and the second end of the sixth switch is electrically connected with the first end of the second switch in the corresponding switch group.
Optionally, at least one of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch is a relay.
Optionally, the floating excitation channel further comprises:
the device comprises a communication unit, a signal generation unit and a signal transmission and collection unit;
the communication unit is electrically connected with the signal generation unit, and is used for communicating with external equipment and controlling the state of the signal generation unit;
the signal generating unit is used for adjusting the output signal according to the control signal;
the signal transmission and acquisition unit is electrically connected with the signal generation unit, the communication unit, the first signal transmission terminal group and the second signal transmission terminal group, the signal transmission and acquisition unit is used for processing an output signal of the signal generation unit into an excitation signal, and the signal transmission and acquisition unit is also used for processing sensing signals acquired by the first signal transmission terminal group and the second signal transmission terminal group and then sending the sensing signals to the communication unit.
Optionally, the signal generating unit comprises a 20-bit digital-to-analog conversion chip,
the signal transmission and acquisition unit comprises a 24-bit analog-to-digital conversion chip, so that the precision of the first signal transmission terminal group and the second signal transmission terminal group is within 100 microvolts;
the at least ten floating excitation channels are independent floating excitation channels that are independently configurable with the control signal.
Alternatively, the signal generating unit can output a pulse voltage and a pulse current;
the signal transmission and acquisition unit is configured to support four-quadrant output, and voltage and current acquisition and control.
Optionally, the test circuit of the battery management system further includes:
the high-voltage acquisition channel is used for acquiring corresponding voltage in the battery management system, and the voltage acquisition maximum value of the high-voltage acquisition channel is larger than a preset value.
Optionally, the test circuit of the battery management system further comprises a power supply electrically connected to the floating stimulus channel.
Optionally, the test circuit of the battery management system further includes transformers corresponding to the floating excitation channels one by one, and the floating excitation channels are electrically connected with the power supply through the corresponding transformers.
According to another aspect of the present utility model, there is provided a test board of a battery management system, including a test circuit of the battery management system.
According to the technical scheme, at least ten floating excitation channels are arranged to generate excitation signals and collect received sensing signals, and each floating excitation channel comprises a first signal transmission terminal group and a second signal transmission terminal group. The first signal transmission terminal group of the floating excitation channel is electrically connected with the corresponding terminal group on the battery management system through the setting selection module, and the second signal transmission terminal group of the floating excitation channel is electrically connected with the corresponding terminal group on the battery management system, or the second signal transmission terminal group of the floating excitation channel is correspondingly and electrically connected with the first signal transmission terminal group of the adjacent floating excitation channel. The voltage of a single floating excitation channel is adjustable by connecting a plurality of floating excitation channels, so that the problem that high-precision test and low-precision test of the BMS chip are required to be performed respectively is solved, the effect of using one circuit to perform various tests is realized, the testing device is simplified, and the cost is saved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a test circuit of a battery management system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a test circuit of another battery management system according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a test circuit of a battery management system according to another embodiment of the present utility model;
FIG. 4 is a schematic diagram of a test circuit of a battery management system according to another embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a test board of a battery management system according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a test circuit of a battery management system according to an embodiment of the present utility model. Referring to fig. 1, a test circuit of a battery management system according to an embodiment of the present utility model includes at least ten floating excitation channels 10, the floating excitation channels 10 including a first signal transmission terminal group 11 and a second signal transmission terminal group 12, the floating excitation channels 10 being used to generate excitation signals and collect received sensing signals. A selection module 20, wherein the selection module 20 is used for electrically connecting the first signal transmission terminal group 11 of the floating excitation channel 10 with a corresponding terminal group on the battery management system; and electrically connects the second signal transmission terminal group 12 of the floating excitation channel 10 with a corresponding terminal group on the battery management system, or connects the second signal transmission terminal group 12 of the floating excitation channel 10 with the first signal transmission terminal group 11 of the floating excitation channel 10 adjacent thereto.
Specifically, a plurality of floating excitation channels 10 may be integrated on one test board, and each floating excitation channel 10 may include a first signal transmission terminal group 11 and a second signal transmission terminal group 12, and the floating excitation channels 10 are configured to send excitation signals to the BMS chip and receive sensing signals fed back by the BMS chip. The selection module 20 is used for electrically connecting the first signal transmission terminal group 11 with a corresponding terminal group on the battery management system, and electrically connecting the second signal transmission terminal group 12 of the floating excitation channel 10 with a corresponding terminal group on the battery management system. The BMS chip has a plurality of analog-to-digital conversion chips, each analog-to-digital conversion chip needs to be tested, and the positive pole and the negative pole of the analog-to-digital conversion chip are connected with the first signal transmission terminal group 11 and the second signal transmission terminal group 12, that is, the first signal transmission terminal group 11 and the second signal transmission terminal group 12 are connected to correspond to the positive pole or the negative pole of the analog-to-digital conversion chip respectively.
The selection module 20 may also connect signal transmission terminal groups of adjacent floating excitation channels 10, so that the floating excitation channels 10 can output excitation signals of different magnitudes. At least ten floating excitation channels are integrated in the test circuit to adjust the excitation signals which can be output, and as the floating excitation channels are connected in series, higher voltage can be output to the BMS chip, the cooperation with other test boards can be reduced, and the integration level of the test circuit is improved.
Illustratively, when testing the BMS chip, the first signal transmission terminal group 11 and the second signal transmission terminal group 12 of each floating excitation channel 10 are connected with two poles of the digital-to-analog conversion chip in the BMS chip, and the floating excitation channels 10 send excitation signals to the digital-to-analog conversion chip in the BMS chip and receive sensing signals fed back by the digital-to-analog conversion chip in the BMS chip. If the magnitude of the excitation signals accessed to the digital-to-analog conversion chip needs to be changed, the signal transmission terminal groups of the adjacent floating excitation channels 10 can be connected through the selection module 20, so that the test precision of the BMS chip on the excitation signals with different magnitudes can be tested. The test circuit of the battery management system provided by the embodiment can test the BMS chip with different precision by using one circuit, so that the effects of performing various tests by using one circuit, simplifying the test device and saving the cost are realized.
Optionally, fig. 2 is a schematic structural diagram of a test circuit of another battery management system according to an embodiment of the present utility model. On the basis of the above-described embodiment, referring to fig. 2, the first signal transmission terminal group 11 includes the first excitation signal output terminal A1 and the first sensing signal acquisition terminal A2, and the second signal transmission terminal group 12 includes the second excitation signal output terminal B1 and the second sensing signal acquisition terminal B2. The selection module 20 includes at least ten switch groups in one-to-one correspondence with at least ten floating excitation channels 10, each switch group including: a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5 and a sixth switch K6. The first end of the first switch K1 is electrically connected to the corresponding first excitation signal output end A1, and the second end of the first switch K1 is electrically connected to the corresponding terminal set on the battery management system. The first end of the second switch K2 is electrically connected with the corresponding first sensing signal acquisition end A2, and the second end of the second switch K2 is electrically connected with the corresponding terminal group on the battery management system. The first end of the third switch K3 is electrically connected with the second excitation signal output end B1, and the second end of the third switch K3 is electrically connected with a corresponding terminal group on the battery management system. The first end of the fourth switch K4 is electrically connected with the second sensing signal acquisition end B2, and the second end of the fourth switch K4 is electrically connected with a corresponding terminal group on the battery management system. The first end of the fifth switch K5 is electrically connected to the second excitation signal output terminal B1, and the second end of the fifth switch K5 is electrically connected to the first end of the first switch K1 in the corresponding switch group. The first end of the sixth switch K6 is electrically connected with the second sensing signal acquisition end B2, and the second end of the sixth switch K6 is electrically connected with the first end of the second switch K2 in the corresponding switch group.
Specifically, each signal transmission terminal group includes an excitation signal output terminal and a sensing signal acquisition terminal, the first signal transmission terminal group 11 includes a first excitation signal output terminal A1 and a first sensing signal acquisition terminal A2, and the second signal transmission terminal group 12 includes a second excitation signal output terminal B1 and a second sensing signal acquisition terminal B2. At least ten switch groups are arranged in the selection module 20, each switch group corresponds to one floating excitation channel 10, and the floating excitation channels 10 can be adjusted according to the on and off states of the switches in the switch groups.
Each switch group comprises a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5 and a sixth switch K6. When the first switch K1 and the second switch K2 are conducted, the first excitation signal output end A1 outputs signals to a digital-to-analog conversion chip in the BMS chip, and the first sensing signal acquisition end A2 acquires sensing signals fed back by the digital-to-analog conversion chip in the BMS chip. When the first switch K1 and the second switch K2 are turned off, the first signal transmission terminal group 11 is turned off. When the third switch K3 and the fourth switch K4 are turned on, the second excitation signal output end B1 outputs signals to the digital-to-analog conversion chip in the BMS chip, and the second sensing signal acquisition end B2 acquires sensing signals fed back by the digital-to-analog conversion chip in the BMS chip. When the third switch K3 and the fourth switch K4 are turned off, the second signal transmission terminal group 12 is turned off.
The second end of the fifth switch K5 is electrically connected to the first end of the first switch K1 in the corresponding switch group: the fifth switch K5 in each switch group is for connection with the first switch K1 in an adjacent switch group. The meaning of the second end of the sixth switch K6 being electrically connected to the first end of the second switch K2 in the corresponding switch group is: the sixth switch K6 in each switch group is for connection with the second switch K2 in the adjacent switch group. The first signal transmission terminal group 11 of the floating excitation channel 10 directly connected in series with the first switch K1 and the second switch K2 of the switch groups may be connected in series with the second signal transmission terminal group 12 of the adjacent floating excitation channel 10 through the fifth switch K5 and the sixth switch K6.
When the fifth switch K5 and the sixth switch K6 are turned on, the second excitation signal output terminal B1 of the floating excitation channel 10 is connected in series with the first excitation signal output terminal A1 of the adjacent floating excitation channel 10, and the second sensing signal collecting terminal B2 of the floating excitation channel 10 is connected in series with the first sensing signal collecting terminal A2 of the adjacent floating excitation channel 10, so that the first signal transmitting terminal group 11 of the floating excitation channel 10 is connected in series with the second signal transmitting terminal group 12 of the adjacent floating excitation channel 10. The total voltage of the individual floating excitation channels 10 after the series connection increases, so that the detection and collection range of the BMS chip increases. The adjacent floating excitation channels 10 can be connected in series at will through a switch group, so that the voltage output by a single floating excitation channel 10 can be adjusted according to the test requirement, and the BMS chip can be tested with different precision.
Illustratively, when the BMS chip is tested, the first, second, third and fourth switches K1, K2, K3 and K4 of the floating excitation channels 10, the number of which is the same as that of the BMS chip, are turned on and the fifth and sixth switches K5 and K6 are turned off according to the number of channels of the BMS chip. Each floating stimulus channel 10 for testing is connected to a channel of one BMS chip.
If the test voltage needs to be increased, the first switch K1 and the second switch K2 of the floating excitation channel 10 adjacent to the floating excitation channel 10 of the test BMS chip are turned off, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are turned on, at this time, the two adjacent floating excitation channels 10 are connected in series, and the voltage increases. Depending on the voltage level required for testing, multiple floating stimulus channels 10 can be connected in series for testing.
Optionally, at least one of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 is a relay.
Specifically, the relay is a switching element having an isolating function, which is widely used in power electronics, and may be used as a switch to control the floating excitation channel 10 or in series with an adjacent floating excitation channel 10 to regulate a test voltage. By way of example, all switches in the test circuit use relays, better control of the test circuit can be achieved.
Optionally, fig. 3 is a schematic structural diagram of a test circuit of another battery management system according to an embodiment of the present utility model. On the basis of the above embodiment, referring to fig. 2, the floating excitation channel 10 further comprises a communication unit 13, a signal generating unit 14 and a signal transmitting and collecting unit 15. The communication unit 13 is electrically connected with the signal generating unit 14, the communication unit 13 is used for communicating with an external device and controlling the state of the signal generating unit 14, the signal generating unit 14 is used for adjusting the output signal according to the control signal, the signal transmission and collection unit 15 is electrically connected with the signal generating unit 14, the communication unit 13, the first signal transmission terminal group 11 and the second signal transmission terminal group 12, the signal transmission and collection unit 15 is used for processing the output signal of the signal generating unit 14 into an excitation signal, and the signal transmission and collection unit 15 is also used for processing the sensing signals collected by the first signal transmission terminal group 11 and the second signal transmission terminal group 12 and sending the processed sensing signals to the communication unit 13.
Specifically, the communication unit 13 may communicate with an external device, and control the signal generating unit 14 to output a signal, and the communication unit 13 is further configured to receive a sensing signal fed back by the signal transmission and acquisition unit 15. The signal generating unit 14 is used for generating a signal and adjusting the output signal according to the control signal of the communication unit 13. The signal transmission and collection unit 15 is connected with the signal generation unit 14, the communication unit 13, the first signal transmission terminal set 11 and the second signal transmission terminal set 12, the signal output by the signal generation unit 14 is processed into an excitation signal by the signal transmission and collection unit 15, and then transmitted to the first signal transmission terminal set 11 and the second signal transmission terminal set 12, and the sensing signal fed back by the BMS chip is output to the signal transmission and collection unit 15 through the first signal transmission terminal set 11 and the second signal transmission terminal set 12 for collection, and is processed by the signal transmission and collection unit 15 and then transmitted to the communication unit 13.
Optionally, the signal generating unit 14 includes a 20-bit digital-to-analog conversion chip, and the signal transmitting and collecting unit 15 includes a 24-bit analog-to-digital conversion chip, so that the accuracy of the first signal transmitting terminal set and the second signal transmitting terminal set is within 100 microvolts, and at least ten floating excitation channels are independent floating excitation channels capable of independently configuring control signals.
Specifically, the floating excitation channels in the test circuit are all independent floating excitation channels, and each floating excitation channel can be independently set when the BMS chip is tested. The signal generating unit 14 can output signals by adopting a 20-bit digital-to-analog conversion chip, so that the output signal noise and error are lower, the resolution is high, and the requirement on high precision is met. The signal transmission and acquisition unit 15 can adopt 24 bit analog-to-digital conversion chip to acquire sensing signals fed back by the BMS chip, so that the setting can meet the precision index during measurement, and meanwhile, lower errors and inherent noise can be ensured and the precision index is ensured when devices such as an analog switch, a reference and an analog operational amplifier are selected. The 20-bit digital-to-analog conversion chip and the 24-bit analog-to-digital conversion chip can ensure that the precision of the first signal transmission terminal group and the second signal transmission terminal group is within 100 microvolts so as to meet the high-precision test of the BMS chip.
Alternatively, the signal generating unit is capable of outputting a pulse voltage and a pulse current, and the signal transmitting and collecting unit is configured to support four-quadrant output, and voltage and current collection and control.
Specifically, the signal generating unit can output pulse voltage and pulse current, so that the floating excitation channel can test the BMS chip by outputting the pulse voltage and the pulse current. The signal transmission and collection unit can perform four-quadrant output, namely voltage output current output, voltage output current input, voltage input current output and voltage input current input, and can collect and control output and input voltage and current. The setting can improve the variety to BMS chip test like this, improves the accuracy of test result.
Optionally, with continued reference to fig. 3, based on the foregoing embodiment, the test circuit of the battery management system further includes a high voltage collecting channel 30, where the high voltage collecting channel 30 is used to collect a voltage corresponding to the battery management system, and a voltage collecting maximum value of the high voltage collecting channel 30 is greater than a preset value.
Specifically, the BMS chip can test a plurality of battery cells, after a plurality of battery cells are connected in series, the total voltage at two ends is higher, and the range of a single floating excitation channel 10 is smaller, so that the high-voltage acquisition channel 30 is required to be used for testing in order to ensure the safety of equipment, the maximum voltage which can be acquired by the high-voltage acquisition channel 30 is greater than the maximum voltage after the battery cells are connected in series, namely, the preset value of the maximum voltage can be 100V or more.
Optionally, fig. 4 is a schematic structural diagram of a test circuit of another battery management system according to an embodiment of the present utility model. Based on the above embodiment, referring to fig. 4, the test circuit of the battery management system further includes a power supply 40, and the power supply 40 is electrically connected to the floating excitation channel 10.
Specifically, the power supply of the test circuit of the battery management system adopts the low-interference small-sized isolated power supply 40 to supply power to the floating excitation channel 10, so as to prevent the power supply 40 from affecting the test BMS chip, and reduce the volume occupied by the power supply 40.
Optionally, with continued reference to fig. 4, based on the above embodiment, the test circuit of the battery management system further includes a transformer 50 in one-to-one correspondence with the floating excitation channels 10, and the floating excitation channels 10 are electrically connected to the power supply 40 through the corresponding transformers 50.
Specifically, each floating excitation channel 10 is connected to the power supply 40 through a transformer 50, and the power supply 40 is isolated from the floating excitation channels 10 through the transformer 50, so that the power supply 40 can be further prevented from affecting the test BMS chip.
Illustratively, when testing the BMS chip using the test circuit of the battery management system, the test circuit of the battery management system is powered by the power source 40, and each floating excitation channel 10 is charged with voltage regulation by one transformer 50. The external device communicates with the communication unit 13 to turn on the first, second, third and fourth switches K1, K2, K3 and K4 of the floating excitation channel 10 of the test BMS chip, and to turn off the fifth and sixth switches K5 and K6. The communication unit 13 generates a control signal to control the signal generating unit 14 to output a signal, the signal transmission and acquisition unit 15 processes the signal output by the signal generating unit 14 into an excitation signal and outputs the excitation signal to the first excitation signal output end A1 and the second excitation signal output end B1, a digital-to-analog conversion chip in the BMS chip detects the excitation signals of the first excitation signal output end A1 and the second excitation signal output end B1 and feeds back a sensing signal, the sensing signal is fed back to the signal transmission and acquisition unit 15 through the first sensing signal acquisition end A2 and the second sensing signal acquisition end B2, the signal transmission and acquisition unit 15 processes the acquired sensing signal and sends the processed sensing signal to the communication unit 13, and the communication unit 13 controls the signal generating unit 14 according to the received signal and adjusts the output signal.
If the output voltage needs to be increased in the testing process, the selection module 20 is used for conducting the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 of the floating excitation channel 10 adjacent to the floating excitation channel 10 of the testing BMS chip, and disconnecting the first switch K1 and the second switch K2, so that the adjacent floating excitation channels 10 are connected in series, and a plurality of adjacent floating excitation channels 10 can be connected in series according to the required voltage, so as to meet the testing requirement. The range of each floating excitation channel 10 is above 5V, the output error is less than +/-100 uV, and if the BMS chip is connected with a plurality of battery cores in series, the voltage exceeds the detectable range of the floating excitation channels 10, the detection and the acquisition are carried out through the high-voltage acquisition channels 30. The voltage of a single floating excitation channel is adjustable by connecting the plurality of floating excitation channels in series, so that the problem that high-precision test and low-precision test of the BMS chip are required to be performed respectively is solved, the high-voltage acquisition channel is arranged, the functions of a plurality of test boards are combined together, one circuit is used for performing various tests, the testing device is simplified, occupied slots are reduced, and the resources and the testing cost of the testing machine are saved.
Optionally, fig. 5 is a schematic structural diagram of a test board of a battery management system according to an embodiment of the present utility model. On the basis of the above embodiments, referring to fig. 5, a test board 200 of a battery management system according to an embodiment of the present utility model includes the test circuit 100 of the battery management system according to any of the above embodiments. The test circuit 100 having the battery management system of any of the above embodiments has the advantages that are not described herein.
Optionally, the test board of the battery management system further comprises at least ten shielding cases corresponding to the floating excitation channels one by one, and the shielding cases cover the corresponding floating excitation channels.
Specifically, each floating excitation channel of the test board of the battery management system is provided with a shielding cover for protection, so that each floating excitation channel is ensured not to be interfered by adjacent floating excitation channels and the outside, and the accuracy of the test is further improved.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. A test circuit for a battery management system, comprising:
at least ten floating excitation channels, the floating excitation channels comprising a first signal transmission terminal set and a second signal transmission terminal set, the floating excitation channels for generating excitation signals and collecting received sensing signals;
the selection module is used for electrically connecting the first signal transmission terminal group of the floating excitation channel with a corresponding terminal group on a battery management system; and electrically connecting the second signal transmission terminal group of the floating excitation channel with a corresponding terminal group on the battery management system, or correspondingly and electrically connecting the second signal transmission terminal group of the floating excitation channel with the first signal transmission terminal group of the adjacent floating excitation channel.
2. The battery management system test circuit of claim 1, wherein the first signal transmission terminal set comprises a first excitation signal output and a first sensing signal acquisition, and the second signal transmission terminal set comprises a second excitation signal output and a second sensing signal acquisition;
the selection module comprises at least ten switch groups corresponding to the at least ten floating excitation channels one by one, and each switch group comprises:
the first end of the first switch is electrically connected with the corresponding first excitation signal output end, and the second end of the first switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the second switch is electrically connected with the corresponding first sensing signal acquisition end, and the second end of the second switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the third switch is electrically connected with the second excitation signal output end, and the second end of the third switch is electrically connected with a corresponding terminal group on the battery management system;
the first end of the fourth switch is electrically connected with the second sensing signal acquisition end, and the second end of the fourth switch is electrically connected with the corresponding terminal group on the battery management system;
the first end of the fifth switch is electrically connected with the second excitation signal output end, and the second end of the fifth switch is electrically connected with the first end of the first switch in the corresponding switch group;
and the first end of the sixth switch is electrically connected with the second sensing signal acquisition end, and the second end of the sixth switch is electrically connected with the first end of the second switch in the corresponding switch group.
3. The battery management system test circuit of claim 2, wherein at least one of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch is a relay.
4. The battery management system test circuit of claim 1, wherein the floating stimulus channel further comprises:
the device comprises a communication unit, a signal generation unit and a signal transmission and collection unit;
the communication unit is electrically connected with the signal generation unit, and is used for communicating with external equipment and controlling the state of the signal generation unit;
the signal generating unit is used for adjusting the output signal according to the control signal;
the signal transmission and acquisition unit is electrically connected with the signal generation unit, the communication unit, the first signal transmission terminal group and the second signal transmission terminal group, the signal transmission and acquisition unit is used for processing an output signal of the signal generation unit into an excitation signal, and the signal transmission and acquisition unit is also used for processing sensing signals acquired by the first signal transmission terminal group and the second signal transmission terminal group and then sending the sensing signals to the communication unit.
5. The battery management system test circuit of claim 4, wherein the signal generation unit comprises a 20-bit digital-to-analog conversion chip,
the signal transmission and acquisition unit comprises a 24-bit analog-to-digital conversion chip, so that the precision of the first signal transmission terminal group and the second signal transmission terminal group is within 100 microvolts;
the at least ten floating excitation channels are independent floating excitation channels that are independently configurable with the control signal.
6. The test circuit of the battery management system according to claim 5, wherein the signal generating unit is capable of outputting a pulse voltage and a pulse current;
the signal transmission and acquisition unit is configured to support four-quadrant output, and voltage and current acquisition and control.
7. The battery management system test circuit of claim 1, wherein the battery management system test circuit further comprises:
the high-voltage acquisition channel is used for acquiring corresponding voltage in the battery management system, and the voltage acquisition maximum value of the high-voltage acquisition channel is larger than a preset value.
8. The battery management system test circuit of claim 1, further comprising a power supply electrically connected to the floating stimulus channel.
9. The battery management system test circuit of claim 8, further comprising a transformer in one-to-one correspondence with the floating excitation channels, the floating excitation channels being electrically connected to the power supply through the corresponding transformers.
10. A test board for a battery management system, characterized in that the test board for a battery management system comprises the test circuit for a battery management system according to any one of claims 1-9.
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| CN202223590403.5U CN218938448U (en) | 2022-12-28 | 2022-12-28 | Test circuit and test board of battery management system |
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| CN202223590403.5U CN218938448U (en) | 2022-12-28 | 2022-12-28 | Test circuit and test board of battery management system |
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