CN117200404A - Multi-switch switching circuit applied to sodium ion battery and vehicle based on multi-switch switching circuit - Google Patents
Multi-switch switching circuit applied to sodium ion battery and vehicle based on multi-switch switching circuit Download PDFInfo
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- CN117200404A CN117200404A CN202311469439.4A CN202311469439A CN117200404A CN 117200404 A CN117200404 A CN 117200404A CN 202311469439 A CN202311469439 A CN 202311469439A CN 117200404 A CN117200404 A CN 117200404A
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- battery
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- switching circuit
- sodium ion
- switch switching
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- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 23
- 238000004590 computer program Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000006978 adaptation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 210000005056 cell body Anatomy 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a multi-switch switching circuit applied to a sodium ion battery and a vehicle based on the same, comprising at least more than two battery modules connected in series, and a control unit connected with a battery data acquisition unit of the battery modules; and the bypass switch of the battery module is used for acquiring a control signal from the control unit and adjusting and switching the number of the battery bodies on the current path when the battery module is wholly powered or charged externally. The opening and closing of the one or more breaking switches and the one or more bypass switches are controlled to be combined, so that the one or more battery bodies are connected into a current path as required. The invention has the advantages of wide input/output adaptation range, low realization cost, good safety, and good charging efficiency, and expands the application scene of the adapted sodium ion battery.
Description
Technical Field
The invention relates to the technical field of electric vehicle power supply, in particular to a multi-switch switching circuit applied to a sodium ion battery and a vehicle based on the multi-switch switching circuit.
Background
Along with energy conservation and emission reduction, environmental protection is greatly promoted, new energy and electric vehicles become large trends in a large direction, and the development of cleaner and environmental-friendly automobiles is globally focused on, so that the lithium ion power battery has unprecedented great development. However, the inherent vulnerability of the lithium ion battery brings hidden danger to the lithium ion power battery automobile, and how to better protect the power battery becomes a long-term struggle goal. However, to date, the protection of the series battery or the battery pack has not progressed much, and there is no substantial breakthrough in terms of improvement of cost and protection performance. The prior art, such as the international application publication No. WO2022073317A1, discloses a series battery protection circuit comprising: the battery module is connected in series between the positive electrode and the negative electrode of the battery pack and comprises a single battery, a protection switch and a single battery protection module; the single battery is connected with the protection switch in series, and the single battery protection module generates a turn-off signal and protects the current battery module based on the turn-off signal; the turn-off signal level shift module is used for transmitting the turn-off signal of any stage of battery modules to other stages of battery modules; the voltage transient suppression module is connected between the positive electrode and the negative electrode of the battery pack and used for absorbing the burr voltage and reducing the change speed of the total voltage between the positive electrode and the negative electrode of the battery pack. The invention reliably realizes the function of protecting the high-voltage series battery based on the low-voltage charge-discharge switching device, thereby protecting the whole series battery and each series battery, and having high safety performance and low cost.
Disclosure of Invention
The invention aims to provide a multi-switch switching circuit applied to a sodium ion battery and a vehicle based on the multi-switch switching circuit, which can be widely matched with input and output, has low implementation cost and good safety, and also has the advantages of charging efficiency and expanding application scenes of the matched sodium ion battery.
A multi-switch switching circuit applied to sodium ion batteries comprises at least more than two battery modules connected in series, wherein: the battery module is provided with a battery body, and the battery body is connected with a bypass switch in parallel; the battery body is connected with a battery data acquisition unit; the battery body is connected in series with a break switch. Taking 8 strings of battery data acquisition units as an example, a plurality of temperature data information can be obtained.
The control unit is connected with the battery data acquisition unit of the battery module;
the bypass switch of the battery module is used for acquiring the control signal from the control unit and adjusting and switching the number of the battery bodies on the current path when the battery module is wholly powered or charged externally. The one or more battery bodies are connected into the current path as required by controlling the opening and closing of the one or more circuit breaking switches and the one or more bypass switches to be combined. In the discharging state, each battery can be charged by paying attention to the access current path through the combined control. When the battery is in an externally powered state, the single battery body can be sequentially connected into the current path to discharge the discharge end. When each battery body cannot reach the voltage required by power supply, more than two battery bodies are connected into a current path by controlling the opening and closing of the circuit breaker and the bypass switch, so that the voltage of a discharge end reaches within a set range or above the set voltage to discharge outwards.
A motor controller is arranged on a bypass of a current path of the battery module in series, and the motor controller can be communicated with any battery body or combination thereof through coupling adjustment of the bypass switch and the circuit breaker switch by a control unit. The motor controller is connected with the battery bodies with different numbers, so that the effect of adjusting the connected voltage is achieved.
In the external power supply state, the quantity of the battery modules and the access time of the corresponding battery modules are dynamically adjusted through detecting the terminal voltage, and the discharge terminal voltage is maintained within a set range or above the set voltage. After all the battery modules are connected in series, the terminal voltage is obtained by detecting the voltage between the outermost terminals. Because the charging and discharging voltage range of the sodium ion battery pack is greatly different from the voltage range which is required to be achieved when the electric vehicle actually works, in actual application, the battery can be completely charged and discharged by needing to be matched with a wide-range input and output.
When the entire battery pack is in a charged state, at least one battery body is not charged for a continuous or discontinuous period of time and is used for heat dissipation of an adjoining or non-adjoining battery. When the battery bodies are arranged in an array, such as a single-layer arrangement. Each of which laterally behaves as a set of battery modules. When one of the battery bodies is in the column, the charging is stopped, namely, the disconnection switches corresponding to all the battery bodies in the column are disconnected, and the bypass switch is conducted according to other surrounding parts. This way, it is controlled that a specific battery body in the battery modules of different groups is disconnected from the passage, and charging is stopped. The above embodiment coordinates three different groups. The heat exchange of the corresponding overheated battery is managed by coordinating whether the battery bodies in different battery modules are charged or not, and the battery which is not charged absorbs the heat of the overheated battery in a temperature difference heat transfer mode.
Alternatively, the battery body around the overheated battery may not be charged. Take a single layer arrangement as an example. The surrounding battery bodies physically distribute heat to the overheated battery bodies.
In the case of a multi-layer, three-dimensional arrangement, the entire cut surface can be stopped or the 26 or directly adjacent 6 cell bodies, which are arranged in a cube around the overheated cell body, can be stopped in the above-described manner.
The invention also provides a control method of the multi-switch switching circuit, which enables the quantity of the battery modules and the access time of the corresponding battery modules to be dynamically adjusted through the coupling adjustment of the control unit to the bypass switch and/or the break switch, and maintains the voltage of the discharge end within a set range or above the set voltage. And the control unit is used for coupling adjustment of the bypass switch and/or the cut-off switch, and the voltage drop rate of the discharge terminal in the later time period is greater than or equal to the voltage drop rate of the discharge terminal in the previous time period.
The control unit is used for coupling adjustment of the bypass switch and/or the disconnecting switch, so that the quantity of the battery modules and the access time of the corresponding battery modules are dynamically adjusted, and the measured temperature of any battery body is maintained to be lower than a set temperature value. Through coupling, select the battery module that is charged, through monitoring temperature, when being close to the risk temperature threshold value of settlement, remove the charge current to this battery body, reach the protection purpose. And meanwhile, switching to a new battery body and/or maintaining the battery body in the normal range of the rest temperature to continue charging.
The invention also provides a vehicle comprising the multi-switch switching circuit applied to the sodium ion battery.
The invention also discloses a computer device comprising one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions that, when executed by the apparatus, cause the apparatus to perform the method described above.
A computer storage medium storing one or more computer programs that, when executed, perform the method described above.
The invention adopts at least more than two battery modules connected in series, and the control unit is connected with the battery data acquisition unit of the battery modules; the bypass switch of the battery module is used for acquiring the control signal from the control unit and adjusting and switching the number of the battery bodies on the current path when the battery module is wholly powered or charged externally. The one or more battery bodies are connected into the current path as required by controlling the opening and closing of the one or more circuit breaking switches and the one or more bypass switches to be combined. In the discharging state, each battery can be charged by paying attention to the access current path through the combined control. When the battery is in an externally powered state, the single battery body can be sequentially connected into the current path to discharge the discharge end. When each battery body cannot reach the voltage required by power supply, more than two battery bodies are connected into a current path by controlling the opening and closing of the circuit breaker and the bypass switch, so that the voltage of a discharge end reaches within a set range or above the set voltage to discharge outwards. The design can better adapt the sodium ion battery on the basis of the circuits of other battery application scenes such as the existing lithium ion battery and the like, and can realize the replacement of battery types and the widening of the application scenes of the sodium ion battery under the condition of lower cost. Therefore, the invention has the advantages of wide input/output adaptation range, low realization cost, good safety, and good charging efficiency, and expands the application scene of the adaptive sodium ion battery.
Drawings
Fig. 1 is a schematic view of an electrical connection structure of a battery module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall circuit connection of an embodiment of the present invention;
FIG. 3 is an equivalent schematic diagram of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic diagram of discharge voltage/time according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of charging voltage/time according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a corresponding time sequence state of each switch in a charging state according to an embodiment of the present invention;
FIG. 7 is a schematic diagram showing the corresponding time sequence states of the switches in the discharging state according to the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating an overheat protection state of charge according to an embodiment of the present invention;
fig. 9 is a charge state schematic diagram of another preferred overheat protection scheme according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below in connection with the following examples.
Examples:
referring to fig. 1 to 9, a multi-switch switching circuit applied to a sodium ion battery includes at least two battery modules connected in series, wherein: taking fig. 1 as an example, the battery module is provided with a battery body (M1), and the battery body (M1) is connected with a bypass switch (Q1) in parallel; the battery body (M1) is connected with a battery data acquisition unit; the battery body (M1) is connected in series with a disconnecting switch (Q2). Taking 8 strings of battery data acquisition units as an example, a plurality of data information such as temperature, voltage and the like can be obtained.
In fig. 2 to 9, a control unit (U4) is connected to the battery data collection units (U1, U2, U3) of the above-mentioned battery modules;
and bypass switches (Q1, Q3, Q5) of the battery module are used for acquiring control signals from the control unit (U4) and adjusting and switching the number of battery bodies (M1, M2, M3) on a current path when the battery module is wholly powered or charged externally.
The bypass switches (Q1, Q3 and Q5) and the cut-off switches (Q2, Q4 and Q6) are MOS tubes.
The one or more battery bodies (M1, M2, M3) are connected into a current path as required by controlling the opening and closing of one or more circuit breaking switches (Q2, Q4, Q6) and one or more bypass switches (Q1, Q3, Q5) to be combined. In the discharging state, each battery can be charged by paying attention to the access current path through the combined control. When the external power supply is in a state, the single battery bodies (M1, M2 and M3) can be sequentially connected into the current paths to discharge the discharge ends. When each battery body (M1, M2, M3) can not reach the voltage required by power supply, more than two battery bodies (M1, M2, M3) are connected into a current path by controlling the opening and closing of the disconnecting switch (Q2, Q4, Q6) and the bypass switch (Q1, Q3, Q5), so that the voltage of a discharge end reaches within a set range or above the set voltage to discharge outwards.
A Motor Controller (MCU) is arranged on a bypass of a series-connected battery module current path, and the Motor Controller (MCU) can be communicated to any battery body or combination thereof through coupling adjustment of bypass switches (Q1, Q3 and Q5) and circuit breaking switches (Q2, Q4 and Q6) by a control unit (U4). The battery bodies with different numbers are connected through a Motor Controller (MCU), so that the effect of adjusting the connection voltage is achieved.
In the external power supply state, the quantity of the battery modules and the access time of the corresponding battery modules are dynamically adjusted through detecting the terminal voltage, and the discharge terminal voltage is maintained within a set range or above the set voltage. After all the battery modules are connected in series, the terminal voltage is obtained by detecting the voltage between the outermost terminals. Because the charging and discharging voltage range of the sodium ion battery pack is greatly different from the voltage range which is required to be achieved when the electric vehicle actually works, in actual application, the battery can be completely charged and discharged by needing to be matched with a wide-range input and output.
Discharge state:
when the full-charge battery starts to discharge
(1) During t0-t1, the MOS transistors Q2, Q4 and Q5 are conducted, Q1, Q3 and Q6 are closed, and the battery bodies M1 and M2 discharge loads through Q2-Q4-Q5;
(2) during t1-t2, the MOS transistors Q2, Q3 and Q6 are conducted to work, the Q1, Q4 and Q5 are closed, and the battery bodies M1 and M3 discharge loads through the Q2-Q3-Q6;
(3) during t2-t3, the MOS transistors Q1, Q4 and Q6 are conducted to work, the Q2, Q3 and Q5 are closed, and the battery bodies M2 and M3 discharge loads through the Q1-Q4-Q6; the 3 processes circulate to each module voltage in turn with a certain period, and enter the fourth step
(4) When the total battery voltage is less than the actual required output voltage of 42V, the MOS transistors Q2, Q4 and Q6 conduct the battery modules M1, M2 and M3 to be serially connected for discharging.
When the entire battery pack is in a charged state, at least one battery body (M1, M2, M3) is not charged for a continuous or discontinuous period of time and is used for heat dissipation of adjacent or non-adjacent batteries. When the battery bodies are arranged in an array, such as a single-layer arrangement. Each of which laterally behaves as a set of battery modules. When one of the battery bodies is in a row, the charging is stopped, namely, the disconnection switches (Q2, Q4 and Q6) corresponding to all the battery bodies in the row are disconnected, and the bypass switches (Q1, Q3 and Q5) are conducted according to other surrounding. This way, it is controlled that a specific battery body in the battery modules of different groups is disconnected from the passage, and charging is stopped. The above embodiment coordinates three different groups. The heat exchange of the corresponding overheated battery is managed by coordinating whether the battery bodies in different battery modules are charged or not, and the battery which is not charged absorbs the heat of the overheated battery in a temperature difference heat transfer mode.
State of charge:
when the battery starts to charge
(1) During t1-t2, the MOS transistors Q2, Q4 and Q6 are conducted to work, the Q1, Q3 and Q5 are closed, and the battery modules M1, M2 and M3 are charged through the Q2-Q4-Q6;
(2) at t2-t3, the MOS transistors Q2, Q4 and Q5 are conducted, Q1, Q3 and Q6 are closed, and the battery modules M1 and M2 are charged through Q2-Q4-Q5;
(3) at t3-t4, the MOS transistors Q2, Q3 and Q6 are conducted to work, the Q1, Q4 and Q5 are closed, and the battery modules M1 and M3 are charged through the Q2-Q3-Q6;
(4) at t4-t5, the MOS transistors Q1, Q4 and Q6 are conducted to work, the Q2, Q3 and Q5 are closed, and the battery modules M2 and M3 are charged through the Q1-Q4-Q6; the 4 processes circulate to each module voltage in turn with a certain period, and enter the fourth step
Standing state:
q1, Q2 and Q3 do not work, so that the purpose of reducing standby power consumption is achieved.
Alternatively, the battery body around the overheated battery may not be charged. Take a single layer arrangement as an example. The surrounding battery bodies physically distribute heat to the overheated battery bodies.
In the case of a multi-layer, three-dimensional arrangement, the entire cut surface can be stopped or the 26 or directly adjacent 6 cell bodies, which are arranged in a cube around the overheated cell body, can be stopped in the above-described manner.
The invention also provides a control method of the multi-switch switching circuit, which enables the quantity of the battery modules and the access time of the corresponding battery modules to be dynamically adjusted through coupling adjustment of the bypass switches (Q1, Q3, Q5) and/or the cut-off switches (Q2, Q4, Q6) by the control unit (U4), and maintains the voltage of the discharge end within a set range or above the set voltage. The control unit (U4) is used for coupling adjustment of the bypass switches (Q1, Q3, Q5) and/or the cut-off switches (Q2, Q4, Q6), and the voltage drop rate of the discharge terminal in the later time period is larger than or equal to that of the discharge terminal in the former time period.
The control unit (U4) is used for coupling adjustment of the bypass switches (Q1, Q3, Q5) and/or the disconnection switches (Q2, Q4, Q6) so as to dynamically adjust the number of the battery modules and the access time of the corresponding battery modules, and the measured temperature of any battery body is maintained to be lower than a set temperature value. Through coupling, select the battery module that is charged, through monitoring temperature, when being close to the risk temperature threshold value of settlement, remove the charge current to this battery body, reach the protection purpose. And meanwhile, switching to a new battery body and/or maintaining the battery body in the normal range of the rest temperature to continue charging.
The embodiment uses 3 battery modules connected in series as an example, and is not limited to the technical scheme. The series battery modules may obviously not be limited to 3.
The invention also discloses a vehicle comprising the multi-switch switching circuit applied to the sodium ion battery.
The invention also discloses a computer device comprising one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions that, when executed by the apparatus, cause the apparatus to perform the method described above.
A computer storage medium storing one or more computer programs that, when executed, perform the method described above.
The invention adopts a novel circuit architecture, reduces the number of power devices, improves the efficiency, reduces the cost, and can realize bidirectional energy flow and have the original charge and discharge characteristics of the battery. The intelligent charging and discharging functions of the battery are increased by matching the sodium ion battery with a charger and a load.
While the invention has been described in connection with the preferred embodiments, it is not intended to be limiting, but it will be understood by those skilled in the art that various changes, substitutions and alterations of the subject matter set forth herein can be made without departing from the spirit and scope of the invention, and it is intended that the scope of the invention shall be defined from the appended claims.
Claims (10)
1. A battery module is provided with a battery body and is characterized in that: the battery body is connected with a bypass switch in parallel; the battery body is connected with a battery data acquisition unit; the battery body is connected with a break switch in series.
2. A multi-switch switching circuit applied to a sodium ion battery, comprising at least more than two battery modules in series according to claim 1, wherein:
the control unit is connected with the battery data acquisition unit of the battery module;
and the bypass switch of the battery module is used for acquiring the control signal from the control unit, and adjusting and switching the number of the battery bodies on the current path when the battery module is wholly powered or charged externally.
3. The multi-switch switching circuit for a sodium ion battery of claim 2, wherein: a bypass of the series battery module current path is provided with a motor controller, and the motor controller can be communicated with any battery body or any combination thereof through coupling adjustment of the bypass switch and the circuit breaker switch by a control unit.
4. The multi-switch switching circuit for a sodium ion battery of claim 2, wherein: in the external power supply state, the quantity of the battery modules and the access time of the corresponding battery modules are dynamically adjusted through detecting the terminal voltage, and the discharge terminal voltage is maintained within a set range or above the set voltage.
5. The multi-switch switching circuit for a sodium ion battery of claim 2, wherein: when the entire battery pack is in a charged state, at least one battery body is not charged for a continuous or discontinuous period of time and is used for heat dissipation of an adjoining or non-adjoining battery.
6. A control method of a multi-switch switching circuit is characterized in that: the multi-switch switching circuit applied to the sodium ion battery as claimed in any one of claims 2 to 5 is adopted, and the control unit is used for coupling adjustment of the bypass switch and/or the break switch, so that the number of the battery modules and the time for connecting the corresponding battery modules are dynamically adjusted, and the voltage of a discharge end is maintained within a set range or above the set voltage.
7. The method for controlling a multi-switch switching circuit according to claim 6, wherein: the bypass switch and/or the disconnection switch are/is coupled and regulated by the control unit, so that the quantity of the battery modules and the access time of the corresponding battery modules are dynamically regulated, and the measured temperature of any battery body is maintained to be lower than a set temperature value.
8. A vehicle characterized by: the vehicle includes the multi-switch switching circuit applied to a sodium ion battery as claimed in any one of claims 2 to 5.
9. A computer device, characterized by: including one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions, which when executed by the apparatus, cause the apparatus to perform the method of any of claims 6 or 7.
10. A computer storage medium characterized by: the computer storage medium storing one or more computer programs which, when executed, are capable of performing the method of any of claims 6 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469439.4A CN117200404B (en) | 2023-11-07 | 2023-11-07 | Multi-switch switching circuit applied to sodium ion battery and vehicle based on multi-switch switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469439.4A CN117200404B (en) | 2023-11-07 | 2023-11-07 | Multi-switch switching circuit applied to sodium ion battery and vehicle based on multi-switch switching circuit |
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| CN117200404A true CN117200404A (en) | 2023-12-08 |
| CN117200404B CN117200404B (en) | 2024-04-09 |
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| CN117200404B (en) | 2024-04-09 |
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