CN113589184A - Battery cell detection system and battery cell detection method - Google Patents
Battery cell detection system and battery cell detection method Download PDFInfo
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- CN113589184A CN113589184A CN202110929398.7A CN202110929398A CN113589184A CN 113589184 A CN113589184 A CN 113589184A CN 202110929398 A CN202110929398 A CN 202110929398A CN 113589184 A CN113589184 A CN 113589184A
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims description 48
- 230000000284 resting effect Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention discloses a battery cell detection system and a battery cell detection method, wherein the battery cell detection system comprises at least one charge-discharge machine and a plurality of charge-discharge channels, each charge-discharge channel is used for installing a battery cell, the battery cell has a charge state, a discharge state and a shelving state, wherein one charge-discharge interface of the charge-discharge machine is selectively and electrically connected with at least two charge-discharge channels and selectively charges and discharges at least two battery cells in the at least two charge-discharge channels, and when one battery cell is in the shelving state, the charge-discharge interface charges and discharges another battery cell. According to the invention, one interface of the charge and discharge machine can selectively correspond to a plurality of battery cores to carry out charge and discharge in turn, so that the utilization rate of the charge and discharge machine can be improved, the testing efficiency is improved, and the labor hour for installing the battery cores is reduced.
Description
Technical Field
The invention relates to the technical field of battery cell detection, in particular to a battery cell detection system and a battery cell detection method.
Background
Before the lithium cell leaves the factory, in order to ensure that the lithium cell can be safely used, the lithium cell needs to be subjected to detection of multiple performances, wherein the detection of charging and discharging of the cell is also an important item. In the current field of electric core detection, a charge-discharge interface of each charge-discharge machine corresponds to an electric core installation channel, an electric core to be tested is installed in each charge-discharge channel, and upper computer software controls each charge-discharge machine to carry out charge-discharge test on the electric core in the channel through a program instruction. Each battery cell testing process mainly comprises three steps of charging, discharging and shelving, wherein in the shelving step, a charging and discharging machine is idle, no voltage or current is transmitted, and waste of a charging and discharging channel is caused.
Disclosure of Invention
The invention aims to provide a cell detection system to solve the problems in the prior art.
In order to solve the above problems, according to an aspect of the present invention, a battery cell detection system is provided, where the battery cell detection system includes at least one charge and discharge machine and a plurality of charge and discharge channels, each of the charge and discharge channels is used to mount a battery cell, and the battery cell has a charge state, a discharge state, and a resting state, where one charge and discharge interface of the charge and discharge machine is selectively electrically connected to at least two charge and discharge channels and selectively charges and discharges at least two battery cells in the at least two charge and discharge channels, and when one of the battery cells is in the resting state, the charge and discharge interface charges and discharges another battery cell.
In one embodiment, the battery cell detection system further includes a charge-discharge switching circuit, and one charge-discharge interface of the charge-discharge machine is electrically connected to the at least two charge-discharge channels through the charge-discharge switching circuit.
In one embodiment, the charge and discharge switching circuit includes a charge and discharge switch, and the charge and discharge machine is switched to be connected with the plurality of charge and discharge channels by the charge and discharge switch.
In one embodiment, a charge-discharge interface of the charge-discharge machine is selectively electrically connected with three charge-discharge channels and selectively charges and discharges a first battery cell, a second battery cell and a third battery cell which are respectively placed in the three charge-discharge channels, so that when the charge-discharge machine charges and discharges the first battery cell, the second battery cell and the third battery cell are in a resting state, when the charge-discharge machine charges and discharges the second battery cell, the first battery cell and the third battery cell are in a resting state, and when the charge-discharge machine charges and discharges the third battery cell, the first battery cell and the second battery cell are in a resting state.
In one embodiment, the shelf time t of the battery cell in the shelf state1Time t for charging with the battery cell in the charging state2And the discharge time t of the battery cell in the discharge state3The following proportional relationship is satisfied: t is t1:t2:t31:1, wherein n is a positive integer greater than 1.
In one embodiment, the battery cell detection system further includes a control module in signal communication with the charge and discharge channel and the charge and discharge switching circuit; preferably, the control module is arranged in the upper computer.
In one embodiment, at least two battery cells are selectively charged and discharged by using a charging and discharging interface of a charging and discharging machine, when the charging and discharging machine charges and discharges one of the battery cells, the other battery cell is in a resting state, and when one of the battery cells is in the resting state, the charging and discharging machine charges and discharges the other battery cell.
The invention also relates to a cell testing method, which selectively charges and discharges n cells by utilizing a charge-discharge interface of the charge-discharge machine and sets the shelving time t of the cells1And a charging time period t2And discharge time period t3The following relationship is satisfied: t is t1＝(n-1)×t2＝(n-1)×t3When the m-th battery cell is charged and discharged by the charge and discharge interface of the charge and discharge machine, the rest n-1 battery cells are in a shelving state, and when the m-th battery cell is in the shelving state, the charge and discharge interface of the charge and discharge machine sequentially charges and discharges the rest n-1 battery cells, wherein m is a positive integer less than or equal to n, and t is a positive integer less than or equal to t1，t2And t3Are all greater than zero.
The invention also relates to another battery cell detection method, which comprises the following steps:
step one, installing n charge and discharge channels and numbering the n charge and discharge channels;
step two, installing a to-be-tested battery cell in each charge and discharge channel and binding the charge and discharge channel with the test battery cell;
step three, electrically connecting a charge-discharge interface of the charge-discharge machine with the input end of the charge-discharge switching circuit;
electrically connecting the plurality of battery cells with different output ends of the charge-discharge switching circuit, and numbering the different output ends of the charge-discharge switching circuit;
step five, defining the charging and discharging channel number of each test battery cell and the output end number of the charging and discharging switching circuit in the control module, and defining the duration of the test working step;
and step six, sequentially charging and discharging the battery cells in the n charge and discharge channels by using the charge and discharge interface, so that when the charge and discharge interface charges and discharges one of the battery cells, the rest n-1 battery cells are in a shelving state, and when one of the battery cells is in the shelving state, the charge and discharge machine sequentially charges and discharges the rest n-1 battery cells.
Alternatively,in the sixth step, the rest time t of each test step is defined1And charging time t2And discharge time t3The following relationship is satisfied: t is t1:t2:t31:1, wherein n is a positive integer greater than 1.
The interface of the charge and discharge machine is charged and discharged in turn corresponding to the plurality of battery cores, so that the utilization rate of the charge and discharge machine can be improved, the testing efficiency can be improved, and the labor hour for installing the battery cores can be reduced.
Drawings
Fig. 1 is a schematic diagram of a cell detection system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a charge/discharge switching circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a cell detection system according to another embodiment of the present invention.
Fig. 4 is a schematic diagram of a charge/discharge switching circuit according to another embodiment of the invention.
Fig. 5 is a schematic diagram of a cell detection method according to an embodiment of the present invention.
100. A battery cell detection system; 1. a charge and discharge machine; 2. a charge and discharge channel; 3. a charge-discharge switching circuit; 4. a control module; 11. a charge-discharge interface; 31. a charge-discharge changeover switch; 32. an input end; 33. an output end;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
Fig. 1 is a schematic diagram of a cell detection system according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a charge-discharge switching circuit according to an embodiment of the present invention. As shown in fig. 1-2, one embodiment of the present invention relates to a cell detection system 100, where the cell detection system 100 includes at least one charging and discharging machine 1 and a plurality of charging and discharging channels 2, and each charging and discharging channel 2 is used for installing one cell. The battery cell has a charging state, a discharging state and a shelving state. One charge-discharge interface 11 of the charge-discharge machine 1 is selectively electrically connected with the at least two charge-discharge channels 2 and selectively charges and discharges at least two battery cells in the at least two charge-discharge channels 2, so that when one of the battery cells is in a shelving state, the charge-discharge interface 11 charges and discharges another battery cell. According to the invention, one interface of the charge and discharge machine 1 corresponds to a plurality of battery cells to carry out charge and discharge in turn, so that the utilization rate of the charge and discharge machine 1 can be improved, the testing efficiency can be improved, and the labor hour for installing the battery cells can be reduced.
The battery cell detection system 100 further includes a charge-discharge switching circuit 3, the charge-discharge machine 1 is provided with a plurality of charge-discharge interfaces 11, and any one of the charge-discharge interfaces 11 is selectively electrically connected to the plurality of charge-discharge channels 2 through the charge-discharge switching circuit 3. Specifically, each charge and discharge interface 11 of the charge and discharge machine 1 is provided with a charge and discharge switching circuit 3, and the charge and discharge switching circuit 3 is connected with a control module 4 in an upper computer through signals. The charge/discharge switching circuit 3 includes a charge/discharge switching switch 31, and selectively connects the charge/discharge motor 1 to the plurality of charge/discharge channels 2 by switching the charge/discharge switching switch 31. For example, when the battery cell in the first charge/discharge channel 2 is in the shelving state, the charge/discharge switching circuit 3 may switch the battery cell connected to the next charge/discharge channel 2, and sequentially rotate until the battery cell in the first charge/discharge channel 2 is shelved and the last battery cell is charged and then switched to the battery cell in the first charge/discharge channel by the charge/discharge switching circuit 3 to discharge. The efficiency of the test can be greatly improved by setting a plurality of electric cores to be charged and discharged in turn.
The battery cell detection system 100 further includes a control module 4, and the control module 4 is in signal communication with the charge and discharge channel 2 and the charge and discharge switching circuit 3. And a serial number is set on each charge and discharge channel 2 and is input into the control module 4, and the control module 4 is adjusted as required to control the charge and discharge switching circuit 3 to sequentially charge the battery cells in the charge and discharge channels 2. Preferably, the control module 4 is disposed in the upper computer, and the operation mode of the charge/discharge switching circuit 3 can be adjusted by programming the upper computer.
The charge and discharge channels 2 are used for fixedly mounting the battery cell so as to facilitate the detection of the battery cell, and one battery cell can be placed in one charge and discharge channel 2. The serial numbers of the charge and discharge channels 2 are bound with the battery cores, and one charge and discharge switching circuit 3 optionally corresponds to the plurality of charge and discharge channels 2 and charges and discharges the battery cores in the plurality of charge and discharge channels 2.
One charge-discharge interface 11 of the charge-discharge machine 1 selectively charges and discharges at least two battery cells. When the charging and discharging machine 1 charges and discharges one of the battery cells, the other battery cell is in a shelving state, and when one of the battery cells is in the shelving state, the charging and discharging machine 1 charges and discharges the other battery cell.
The following describes a flow chart of the control module 4 controlling the two charge and discharge channels 2 with reference to the left two block diagrams of fig. 5. As shown in fig. 5, the control module 4 controls the operation of the cell detection system according to the following method, specifically, the method includes the following steps:
step 201: the charging and discharging machine charges the battery cell a of the first charging and discharging channel 21, and sets the current intensity and the charging time period t1, for example, the current is set to 10A, and the charging time period is set to 1 h;
step 202: after time t1, the battery cell a in the first charge-discharge channel 21 is charged, and the battery cell a is placed;
step 203: and judging whether the switching is needed. If the switching is not needed, after the resting time period t2, the operation proceeds to step 205, and the resting of the battery cell a is finished. If a handover is required, step 206 is entered: the battery core B is ready to be charged, and after the preparation time t3 elapses, the process returns to step 201: the charging and discharging machine charges the battery cell B of the second charging and discharging channel 22; and after the time t1, step 202 is entered: after the battery cell B in the second charge-discharge channel 22 is charged, the battery cell B is placed;
then, returning to step 203: judging whether switching is needed, if not, entering step 205: after the resting time period t2, the cell B is resting. If a handover is required, step 206 is entered: the battery cell a is ready for charging, and after the preparation time t3 elapses, the process returns to step 201, and the battery cell a starts charging.
The right block diagram in fig. 5 is an instruction input in the upper computer. As shown in the right block diagram of fig. 5, the instructions input in the upper computer include: 10A, charging 1H; b, switching; an inspection module; 10A, charging 1H; switching A, checking a module; 10A, charging 1H.
It can be understood that, according to the ratio of the resting time to the charging and discharging time, the control module 4 may also control the operation of a plurality of battery cells, the principle is consistent with fig. 5, and the operation steps of each battery cell are also consistent. Another embodiment of the present invention is described below with reference to fig. 3 and fig. 4, where fig. 3 is a schematic diagram of a cell detection system according to the embodiment, and fig. 4 is a schematic diagram of a charge and discharge switching circuit according to the embodiment.
In this embodiment, as shown in fig. 3 and 4, one charge and discharge interface 11 is selectively electrically connected to the three charge and discharge channels 2 and selectively charges and discharges a first cell, a second cell and a third cell respectively disposed in the three charge and discharge channels 2. When the charging and discharging machine 1 charges and discharges the first battery cell, the second battery cell and the third battery cell are in a shelving state. When the charging and discharging machine 1 charges and discharges the second battery cell, the first battery cell and the third battery cell are in a shelving state. And when the charge and discharge machine 1 charges and discharges the third battery cell, the first battery cell and the second battery cell are in a shelving state. Specifically, the charge and discharge machine 1 charges for the first electric core, the second electric core and the third electric core are in a shelving state, the first electric core is charged, and the charge and discharge switching circuit 3 is sequentially switched to the second electric core and the third electric core for charging. After the charging and discharging machine 1 completes the charging for the third battery cell, the charging and discharging switching circuit 3 is switched to the first battery cell again to discharge for the first battery cell, the first battery cell is in a shelving state after discharging, and the charging and discharging switching circuit 3 then sequentially discharges for the second battery cell and the third battery cell.
Defining a shelving time t of each battery cell in a shelving state1Time t for charging when battery cell is in charging state2Time t of discharge of cell in discharge state3. The time duration for the resting state, the charging state and the discharging state satisfying the proportional relationship may be set as: t is t1:t2:t31:1, where n is a positive integer greater than 1, and it is understood that n is the number of cells corresponding to one charge and discharge interface 11, that is, one charge and discharge switching circuit 3 charges and discharges n cells. For example, n is 2, which represents that one charge-discharge interface 11 may be alternately switched to charge and discharge two battery cells, as shown in fig. 1 and fig. 2, when the charge-discharge machine 1 charges and discharges a first battery cell, the other battery cell is in a resting state; when the first battery cell is charged t2The battery is in a laying state, and the charging and discharging circuit is switched to another battery cell to be sequentially charged and discharged; when the shelving state of the first battery cell reaches t1When the first battery cell is charged, the charging and discharging switching circuit 3 is switched to the first battery cell again to discharge the first battery cell, and the first battery cell is discharged for a time period t3And then, the charging and discharging switching circuit 3 is switched to another battery cell again to discharge the battery cell. So in turn, a charge-discharge interface 11 corresponds a plurality of electric cores and charges and discharges, has saved and has shelved state time. The charging and discharging switching circuit 3 is electrically connected with the control module 4, the n charging and discharging channels 2 are numbered and the numbers are input into the control module 4, the upper computer is programmed in and out, and the charging and discharging switching circuit 3 is controlled by the control module 4 to carry out the programming on the n electricityAnd charging and discharging the core. Optionally, a timer is further included in the control module 4 to calculate the duration of each state to control the switching of the charge-discharge switching circuit 3.
The invention also relates to a cell detection method, which utilizes a charge-discharge interface 11 of the charge-discharge machine 1 to selectively charge and discharge n cells and sets the shelf time t of the cells1And a charging time period t2And discharge time period t3The following relationship is satisfied: t is t1＝(n-1)×t2＝(n-1)×t3. When a charge-discharge interface 11 of the charge-discharge machine 1 charges and discharges the mth battery cell, the rest n-1 battery cells are in the shelving state, and when the mth battery cell is in the shelving state, the charge-discharge interface 11 of the charge-discharge machine 1 sequentially charges and discharges the rest n-1 battery cells, wherein m is a positive integer less than or equal to n, and t is a positive integer less than or equal to t1，t2And t3Are all greater than zero.
The invention also relates to another cell detection method, as shown in fig. 5, which comprises the following steps:
step one, installing n charge and discharge channels 2 and numbering the n charge and discharge channels 2;
it can be understood that the numbering method is not limited, and the letters or numbers can be obtained by the second step, installing a to-be-tested battery cell in each charge and discharge channel 2 and binding the charge and discharge channel 2 with the test battery cell;
the serial number of the battery cell corresponds to the serial number of the charge and discharge channel 2, and the detection result can directly display the test result of each battery cell. As in the embodiment shown in fig. 5, the first charge/discharge channel 21 and the battery cell a may be bound, and the second charge/discharge channel 22 and the battery cell B may be bound.
Step three, electrically connecting a charge-discharge interface 11 of the charge-discharge machine 1 with an input end 32 of the charge-discharge switching circuit 3;
fourthly, electrically connecting the plurality of battery cells with different output ends 33 of the charge and discharge switching circuit 3, and numbering the different output ends 33 of the charge and discharge switching circuit 3;
the charge and discharge switching circuit 3 includes an input end 32 and n output ends 33, each output end 33 is electrically connected to a cell, and the charge and discharge switching circuit 3 charges and discharges the corresponding cell when switching to each output end 33. It is understood that the output terminal 33 numbers of the charge and discharge switching circuit 3 and the numbers of the charge and discharge channels 2 correspond one to one.
Step five, defining the serial number of the charging and discharging channel 2 of each test battery cell and the serial number of the output end 33 of the charging and discharging switching circuit 3 in the control module 4, and testing the duration of the working step;
and step six, sequentially charging and discharging the battery cells in the n charge and discharge channels 2 by using a charge and discharge interface 11, wherein when the charge and discharge interface 11 charges and discharges one of the battery cells, the rest n-1 battery cells are in a shelving state, and when one of the battery cells is in the shelving state, the charge and discharge machine 1 sequentially charges and discharges the rest n-1 battery cells.
Optionally, in step six, a resting time t for each test step is defined1And charging time t2And discharge time t3The following relationship is satisfied: t is t1:t2:t31:1, wherein n is a positive integer greater than or equal to 1.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. A battery cell detection system is characterized by comprising at least one charge-discharge machine and a plurality of charge-discharge channels, wherein each charge-discharge channel is used for installing a battery cell, the battery cell has a charge state, a discharge state and a shelving state, wherein,
and a charge-discharge interface of the charge-discharge machine is selectively and electrically connected with the at least two charge-discharge channels and selectively charges and discharges at least two battery cores in the at least two charge-discharge channels, so that when one battery core is in a shelving state, the charge-discharge interface charges and discharges the other battery core.
2. The battery cell detection system of claim 1, further comprising a charge-discharge switching circuit, wherein a charge-discharge interface of the charge-discharge machine is electrically connected to at least two of the charge-discharge channels through the charge-discharge switching circuit.
3. The battery cell detection system of claim 2, wherein the charge-discharge switching circuit includes a charge-discharge switching switch, and the charge-discharge machine is switched to be connected to the plurality of charge-discharge channels by the charge-discharge switching switch.
4. The cell detection system of claim 1, wherein a charge-discharge interface of the charge-discharge machine is selectively electrically connected to three charge-discharge channels and selectively charges and discharges a first cell, a second cell, and a third cell that are respectively disposed in the three charge-discharge channels, such that when the charge-discharge machine charges and discharges the first cell, the second cell and the third cell are in a resting state, when the charge-discharge machine charges and discharges the second cell, the first cell and the third cell are in a resting state, and when the charge-discharge machine charges and discharges the third cell, the first cell and the second cell are in a resting state.
5. The cell detection system of claim 1, wherein the cell is in the at rest state for a rest time period t1Time t for charging with the battery cell in the charging state2And the discharge time t of the battery cell in the discharge state3The following proportional relationship is satisfied: t is t1:t2:t31:1, wherein n is a positive integer greater than 1.
6. The cell detection system of claim 1, further comprising a control module in signal communication with the charge-discharge channel and the charge-discharge switching circuit; preferably, the control module is arranged in the upper computer.
7. The battery cell detection method is characterized by comprising the steps of selectively charging and discharging at least two battery cells by utilizing a charging and discharging interface of a charging and discharging machine, so that when the charging and discharging machine charges and discharges one of the battery cells, the other battery cell is in a shelving state, and when one of the battery cells is in the shelving state, the charging and discharging machine charges and discharges the other battery cell.
8. The cell detection method is characterized by comprising the steps of selectively charging and discharging n cells by utilizing a charge-discharge interface of a charge-discharge machine, and setting the shelving duration t of the cells1And a charging time period t2And discharge time period t3The following relationship is satisfied: t is t1＝(n-1)×t2＝(n-1)×t3When the m-th battery cell is charged and discharged by the charge and discharge interface of the charge and discharge machine, the rest n-1 battery cells are in a shelving state, and when the m-th battery cell is in the shelving state, the charge and discharge interface of the charge and discharge machine sequentially charges and discharges the rest n-1 battery cells, wherein m is a positive integer less than or equal to n, and t is a positive integer less than or equal to t1，t2And t3Are all greater than zero.
9. The battery cell detection method is characterized by comprising the following steps:
step one, installing n charge and discharge channels and numbering the n charge and discharge channels;
step two, installing a to-be-tested battery cell in each charge and discharge channel and binding the charge and discharge channel with the test battery cell;
step three, electrically connecting a charge-discharge interface of the charge-discharge machine with the input end of the charge-discharge switching circuit;
electrically connecting a plurality of battery cores with different output ends of the charge-discharge switching circuit, and numbering the different output ends of the charge-discharge switching circuit;
step five, defining the charging and discharging channel number of each test battery cell and the output end number of the charging and discharging switching circuit in the control module, and defining the duration of the test working step;
and step six, sequentially charging and discharging the battery cells in the n charge and discharge channels by using the charge and discharge interface, so that when the charge and discharge interface charges and discharges one of the battery cells, the rest n-1 battery cells are in a shelving state, and when one of the battery cells is in the shelving state, the charge and discharge machine sequentially charges and discharges the rest n-1 battery cells.
10. Method according to claim 9, characterized in that in step six, a rest time t is defined for each test step1And charging time t2And discharge time t3The following relationship is satisfied: t is t1:t2:t31:1, wherein n is a positive integer greater than 1.
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| CN116559545A (en) * | 2023-07-10 | 2023-08-08 | 宏晶微电子科技股份有限公司 | Capacitor frequency conversion circuit and integrated circuit chip |
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| CN211374996U (en) * | 2019-09-29 | 2020-08-28 | 上海度普新能源科技有限公司 | Conversion distribution device for automobile battery charging and discharging equipment |
| CN111130178A (en) * | 2020-01-03 | 2020-05-08 | 北京航空航天大学 | Multi-vehicle cooperation vehicle-mounted charging device and method |
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