CN106740206B - Quick-changing method and system for battery pack of electric vehicle - Google Patents
Quick-changing method and system for battery pack of electric vehicle Download PDFInfo
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- CN106740206B CN106740206B CN201611209199.4A CN201611209199A CN106740206B CN 106740206 B CN106740206 B CN 106740206B CN 201611209199 A CN201611209199 A CN 201611209199A CN 106740206 B CN106740206 B CN 106740206B
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Abstract
The invention provides a quick-change method and a quick-change system for an electric vehicle battery pack, wherein the quick-change method for the electric vehicle battery pack comprises the following steps: the electric vehicle is provided with a first battery pack and a second battery pack which can be respectively and independently used as power supplies; the output end of the first battery pack is connected with the output end of the second battery pack in parallel; and when the SOC of the first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to a second battery pack for supplying power. The quick-change method and the quick-change system for the battery pack of the electric vehicle effectively solve the problem of short driving mileage of the electric vehicle in the prior art.
Description
The application is a divisional application of an invention patent application with the application date of 2015, 2 and 9, the application number of 201510067192.2, and the title of 'quick change method and system for battery pack of electric vehicle'.
Technical Field
The invention relates to the field of electric vehicle equipment, in particular to a quick-changing method and a quick-changing system for a battery pack of an electric vehicle.
Background
In the prior art, a power battery is mainly installed on a chassis of an electric vehicle, and when a chassis power battery SOC (short for state of Charge, which refers to a ratio of a charging capacity to a rated capacity, expressed in percentage) is too low to work, the electric vehicle cannot work normally, so that the driving mileage of the electric vehicle is short.
Moreover, the power battery of the electric vehicle needs to be charged for a long time, which wastes a lot of time.
Disclosure of Invention
The invention aims to provide a quick-change method and a quick-change system for an electric vehicle battery pack, which solve the problem of short driving mileage of an electric vehicle.
In order to achieve the above object, according to an aspect of the present invention, there is provided a quick-change method of a battery pack for an electric vehicle, including: the electric vehicle is provided with a first battery pack and a second battery pack which can be respectively and independently used as power supplies; the output end of the first battery pack is connected with the output end of the second battery pack in parallel; and when the SOC of the first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to the second battery pack to supply power.
Further, the first battery pack and the second battery pack each include a plurality of individually detachable modules, each of which is individually chargeable in a home electric environment.
Furthermore, a first main positive relay is arranged on an internal connection line of an output end of the first battery pack, and the first main positive relay is connected with a first diode in parallel; a second main positive relay is arranged on an internal connection line of the output end of the second battery pack and connected with a second diode in parallel; when the first battery pack supplies power, the first main positive relay is closed, and the second main positive relay is opened.
Further, the step of switching to supply power to the second battery pack under the condition that the electric vehicle is in a running state includes: the first main positive relay is disconnected, and the first battery pack supplies power to the outside through the first diode; the second main positive relay is closed, and the second battery pack supplies power to the outside through the second main positive relay; and under the condition that the voltage of the second battery pack is greater than that of the first battery pack, the first diode which is conducted in one direction is disconnected.
Further, after the step of turning off the first diode which is unidirectionally turned on, the method further comprises the steps of: and enabling the low-voltage system of the first battery pack to enter a sleep mode through a gateway controller.
Further, the step of switching to the second battery pack for supplying power under the condition that the electric vehicle is in a parking state includes: enabling, by a gateway controller, a low voltage system of the first battery pack into a sleep mode, enabling a low voltage system of the second battery pack and disabling the enabling of the low voltage system of the first battery pack during the restart of the electric vehicle, thereby supplying power only through the second battery pack.
According to another aspect of the present invention, there is provided a quick-change system for a battery pack of an electric vehicle, including: the first battery pack and the second battery pack which can be respectively and independently used as power supplies are arranged on the electric vehicle, and the output end of the first battery pack is connected with the output end of the second battery pack in parallel; a switching unit configured to: and when the SOC of the first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to the second battery pack to supply power.
Further, the first battery pack and the second battery pack each include a plurality of individually detachable modules, each of which is individually chargeable in a home electric environment.
Furthermore, a first main positive relay is arranged on an internal connection line of an output end of the first battery pack, and the first main positive relay is connected with a first diode in parallel; a second main positive relay is arranged on an internal connection line of the output end of the second battery pack and connected with a second diode in parallel; when the first battery pack supplies power, the first main positive relay is closed, and the second main positive relay is opened.
Further, under the condition that the electric vehicle is in a running state, the switching unit is specifically configured to: the first main positive relay is turned off, and the first battery pack supplies power to the outside through the first diode; closing the second main positive relay, and supplying power to the second battery pack through the second main positive relay; under the condition that the voltage of the second battery pack is greater than the voltage of the first battery pack, the first diode which is in one-way conduction is disconnected; under the condition that the electric vehicle is in a parking state, the switching unit is specifically configured to: enabling, by a gateway controller, a low voltage system of the first battery pack into a sleep mode, enabling a low voltage system of the second battery pack and disabling the enabling of the low voltage system of the first battery pack during the restart of the electric vehicle, thereby supplying power only through the second battery pack.
The electric vehicle is provided with two power supplies which are connected in parallel, when the electric quantity of one power supply (the first battery pack is generally a priority power supply) is too low, the other power supply (the second battery pack is generally a standby power supply) is switched to work, and therefore the driving range of the electric vehicle can be effectively increased.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic view of a quick-change method of a battery pack for an electric vehicle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of step S30 of the quick-change method for the battery pack of the electric vehicle shown in fig. 1;
FIG. 3 is a schematic view of a quick-change system for a battery pack of an electric vehicle according to one embodiment of the present invention;
fig. 4 is a topology of a first battery pack of the quick-change system of the electric vehicle battery pack of fig. 3;
fig. 5 is a topology diagram of a second battery pack of the quick-change system for battery packs of the electric vehicle shown in fig. 3;
fig. 6 is a schematic structural diagram of a first battery pack of the quick-change system for battery packs of electric vehicles shown in fig. 3.
Detailed Description
Fig. 1 is a schematic view of a quick-change method of a battery pack for an electric vehicle according to an embodiment of the present invention. The method for quickly replacing the battery pack of the electric vehicle comprises the following steps:
s10: the electric vehicle is provided with a first battery pack and a second battery pack which can be respectively and independently used as power supplies; the output end of the first battery pack is connected in parallel with the output end of the second battery pack.
S20: and judging whether the SOC of the first battery pack which is currently supplied with power is smaller than a preset threshold value.
S30: and when the SOC of the first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to a second battery pack for supplying power. If the SOC of the currently supplied first battery pack is greater than the predetermined threshold value, the execution proceeds to step S30.
Where SOC is an abbreviation for State of Charge, referring to the ratio of Charge capacity to rated capacity, expressed in percent. The battery has a rated capacity, the charging capacity can be obtained by charging for a certain time under a certain multiplying power, and the ratio of the charging capacity to the rated capacity is the SOC. The predetermined threshold may be set according to the lowest output power of the battery pack or according to the condition that the battery pack is prevented from being damaged due to the exhausted power, and is generally set to be between 5% and 8%.
The electric vehicle is provided with two power supplies which are connected in parallel, when the electric quantity of one power supply (the first battery pack is generally a priority power supply) is too low, the other power supply (the second battery pack is generally a standby power supply) is switched to work, and therefore the driving range of the electric vehicle can be effectively increased.
In consideration of the quick replacement and charging of the battery pack, the quick replacement method of the embodiment further includes: the first battery pack and the second battery pack each include a plurality of individually detachable modules, each of which can be individually charged in a home electric environment.
The first battery pack and the second battery pack are composed of n (n is larger than or equal to 1 and is an integer) modules, the modules are connected with the battery box body through the quick connectors, the modules are convenient to replace quickly, and the weight of each module ensures that an adult can move and replace normally. Every module can charge alone in being at home, convenient and fast safety.
The quick-change method of this embodiment further includes: and a first main positive relay is arranged on an internal connection line of the output end of the first battery pack and connected with a first diode in parallel. And a second main positive relay is arranged on the internal connection line of the output end of the second battery pack and connected with a second diode in parallel. When the first battery pack supplies power, the first main positive relay is closed, and the second main positive relay is opened. The first diode and the second diode are both low-voltage drop high-overcurrent type diodes and mainly play roles in reverse connection prevention and forward connection.
In this embodiment, it is further preferable that the step of supplying power to the battery pack is optimized, referring to fig. 2, during the step of supplying power to the battery pack, it is first required to detect whether the electric vehicle is in a driving state or a parking state. Wherein, under the condition that the electric motor car is in the driving state, the step of switching to the second battery package to supply power includes:
s41: the first main positive relay is disconnected, and the first battery pack supplies power to the outside through the first diode;
s42: the second main positive relay is closed, and the second battery pack supplies power to the outside through the second main positive relay; and under the condition that the voltage of the second battery pack is greater than that of the first battery pack, the first diode which is in one-way conduction is disconnected.
S43: the low voltage system of the first battery pack is caused to enter a sleep mode by the gateway controller.
And when the electric vehicle is in the parking state, the step of switching to the second battery pack for supplying power comprises the following steps:
s51: the low-voltage system of the first battery pack is enabled to enter a sleep mode through the gateway controller, the low-voltage system of the second battery pack is enabled and the low-voltage system of the first battery pack is disabled during the electric vehicle restarting process, so that power is supplied only through the second battery pack.
The invention further provides an embodiment of a quick-change system for a battery pack of an electric vehicle, and specifically, referring to fig. 3, the quick-change system includes a first battery pack 10, a second battery pack 20 and a switching unit, the first battery pack 10 and the second battery pack 20 can be respectively and independently used as power supplies and are configured on the electric vehicle, and an output end of the first battery pack 10 is connected in parallel with an output end of the second battery pack 20. The switching unit is configured to: when the SOC of the first battery pack 10 currently supplying power is less than a predetermined threshold value, the second battery pack 20 is switched to supply power. The predetermined threshold may be set according to the lowest output power of the battery pack or according to the condition that the battery pack is prevented from being damaged due to the exhausted power, and is generally set to be between 5% and 8%.
The electric vehicle is provided with two power supplies which are connected in parallel, when the electric quantity of one power supply (the first battery pack is generally a priority power supply) is too low, the other power supply (the second battery pack is generally a standby power supply) is switched to work, and therefore the driving range of the electric vehicle can be effectively increased.
In view of the rapid exchange and charging of the battery packs, the first and second battery packs 10 and 20 each include a plurality of individually detachable modules 30, each module 30 being individually chargeable in a home electric environment. Referring to the structural view of the first battery pack 10 shown in fig. 6, since the second battery pack has the same structure as the module 30 inside the first battery pack, the structure of the second battery pack is not shown, but may be seen in fig. 6.
The first battery pack 10 and the second battery pack 20 are internally composed of n (n is more than or equal to 1 and is an integer) modules 30, the modules 30 are connected with the battery box body through quick connectors, the modules are convenient to replace quickly, and the weight of each module 30 ensures that an adult can move and replace normally. Each module 30 can be charged independently at home, which is convenient, fast and safe.
Referring to fig. 4, a first main positive relay 11 is disposed on an internal connection line of an output end of the first battery pack 10, and the first main positive relay 11 is connected in parallel with the first diode 12. Referring to fig. 5, a second main positive relay 21 is disposed on an internal connection line of an output terminal of the second battery pack 20, and the second main positive relay 21 is connected in parallel with a second diode 22. During normal driving, the first battery pack 10 is generally used for supplying power, and when the first battery pack 10 is supplied with power, the first main positive relay 11 is closed and the second main positive relay 21 is opened.
The switching unit in this embodiment is used for controlling the electric vehicle, but the driving state of the electric vehicle also needs to be considered. Therefore, under the condition that the electric vehicle is in the traveling state, the switching unit is specifically configured to: the first main positive relay 11 is turned off, and the first battery pack 10 supplies power to the outside through the first diode 12; the second main positive relay 21 is closed, and the second battery pack 20 supplies power to the outside through the second main positive relay 21; under the condition that the voltage of the second battery pack 20 is greater than the voltage of the first battery pack 10, the first diode 12, which is unidirectionally turned on, is turned off.
And under the condition that the electric vehicle is in the parking state, the switching unit is specifically configured to: the low voltage system of the first battery pack 10 is brought into a sleep mode by the gateway controller, the low voltage system of the second battery pack 20 is activated and the activation of the low voltage system of the first battery pack 10 is prohibited during the restart of the electric vehicle, so that power is supplied only through the second battery pack 20.
Operation switching: when the first battery pack 10 needs to be switched to the second battery pack 20 when working, the first main positive relay 11 of the first battery pack 10 is controlled to be disconnected, at the moment, the first diode 12 is connected for supplying power to the outside, the second main positive relay 21 of the second battery pack 20 is closed on the next step, at the moment, the two battery packs supply power to the outside simultaneously, but because the voltage of the second battery pack 20 is higher than that of the first battery pack 10, the first diode 12 is cut off in the reverse direction, the voltage cannot be output, the voltage mutation and the potential difference between the two battery packs cannot occur, and the gateway controller enables the low-voltage system of the first battery pack 10 to enter a sleep mode, so that the switching is completed smoothly.
Parking switching: when the SOC of the first battery pack 10 is too low, after the vehicle is stopped, the gateway controller makes the low-voltage system of the first battery pack 10 enter a sleep mode, and when the vehicle is restarted, only the electrical system of the second battery pack 20 is started to complete the switching.
Each battery pack comprises n (n is more than or equal to 1 and is an integer) battery system acquisition boards L ECU and a battery system main control board BMU, wherein the acquisition boards mainly acquire the voltage and the temperature of each single battery, and the battery system main control board mainly communicates with peripheral units of the battery system.
The battery system main control board controls the on or off of a relay in the battery pack through signals, and simultaneously monitors the voltage between the total positive voltage and the total negative voltage. The battery system main control board collects the current detected by the current sensor at any time and is used as one of main bases for calculating the SOC. The battery system main control board detects the on and off states of the relay as a safety monitoring condition. The battery system main control board outputs control signals to control the work of loads such as fans in the battery pack.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A quick change method for a battery pack of an electric vehicle is characterized by comprising the following steps:
the electric vehicle is provided with a first battery pack and a second battery pack which can be respectively and independently used as power supplies;
the output end of the first battery pack is connected with the output end of the second battery pack in parallel;
when the SOC of a first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to a second battery pack for supplying power;
in the step of switching to supply power to the second battery pack, it is detected that the electric vehicle is in a driving state or a parking state, and
under the condition that the electric vehicle is in a parking state, enabling a low-voltage system of the first battery pack to enter a sleep mode through a gateway controller,
and in the process of restarting the electric vehicle, starting a low-voltage system of the second battery pack and forbidding starting a low-voltage system of the first battery pack, so that power is supplied only through the second battery pack.
2. The quick-change method according to claim 1,
the first battery pack and the second battery pack each include a plurality of individually detachable modules, each of which is individually chargeable in a home electric environment.
3. The quick-change method according to claim 1,
a first main positive relay is arranged on an internal connection line of the output end of the first battery pack and connected with a first diode in parallel;
a second main positive relay is arranged on an internal connection line of the output end of the second battery pack and connected with a second diode in parallel;
when the first battery pack supplies power, the first main positive relay is closed, and the second main positive relay is opened.
4. The quick-change method according to claim 3, further comprising, after the step of turning off the first diode which is unidirectionally conducting: and enabling the low-voltage system of the first battery pack to enter a sleep mode through a gateway controller.
5. A quick change system of an electric vehicle battery pack is characterized by comprising:
the first battery pack and the second battery pack which can be respectively and independently used as power supplies are arranged on the electric vehicle, and the output end of the first battery pack is connected with the output end of the second battery pack in parallel;
a switching unit configured to: when the SOC of a first battery pack which is currently supplied with power is smaller than a preset threshold value, switching to a second battery pack for supplying power; and is
The switching unit detects that the electric vehicle is in a running state or a parking state in the process of switching to the second battery pack for supplying power, and enables a low-voltage system of the first battery pack to enter a sleep mode through a gateway controller under the condition that the electric vehicle is in the parking state;
and in the process of restarting the electric vehicle, starting a low-voltage system of the second battery pack and forbidding starting a low-voltage system of the first battery pack, so that power is supplied only through the second battery pack.
6. The quick-change system according to claim 5,
the first battery pack and the second battery pack each include a plurality of individually detachable modules, each of which is individually chargeable in a home electric environment.
7. The quick-change system according to claim 5,
a first main positive relay is arranged on an internal connection line of the output end of the first battery pack and connected with a first diode in parallel;
a second main positive relay is arranged on an internal connection line of the output end of the second battery pack and connected with a second diode in parallel;
when the first battery pack supplies power, the first main positive relay is closed, and the second main positive relay is opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611209199.4A CN106740206B (en) | 2015-02-09 | 2015-02-09 | Quick-changing method and system for battery pack of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510067192.2A CN104709104B (en) | 2015-02-09 | 2015-02-09 | Method and system for rapidly switching battery packs of electric vehicle |
| CN201611209199.4A CN106740206B (en) | 2015-02-09 | 2015-02-09 | Quick-changing method and system for battery pack of electric vehicle |
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| CN201510067192.2A Division CN104709104B (en) | 2015-02-09 | 2015-02-09 | Method and system for rapidly switching battery packs of electric vehicle |
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| CN106740206A CN106740206A (en) | 2017-05-31 |
| CN106740206B true CN106740206B (en) | 2020-07-21 |
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| CN201510067192.2A Active CN104709104B (en) | 2015-02-09 | 2015-02-09 | Method and system for rapidly switching battery packs of electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4035948A4 (en) * | 2020-12-16 | 2022-08-03 | Contemporary Amperex Technology Co., Limited | Power supply device, battery management system, power supply system, control method and medium |
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| CN106427936B (en) * | 2015-08-04 | 2020-04-24 | 岳秀兰 | Battery box replacing system formed by monitoring workstation, battery replacing station and electric automobile through Internet of things |
| CN106627188B (en) * | 2016-03-23 | 2022-07-08 | 上海火亮新能源科技有限公司 | Electric automobile increases journey system |
| CN107472045A (en) * | 2016-12-22 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Battery bag and vehicle |
| CN107539151B (en) * | 2017-08-31 | 2021-01-29 | 西安特锐德智能充电科技有限公司 | Charging and battery-replacing integrated power battery system, working method and application |
| CN107444176B (en) * | 2017-08-31 | 2021-12-07 | 西安特锐德智能充电科技有限公司 | Charging and battery-replacing integrated power battery system, working method and application thereof |
| CN107599858B (en) * | 2017-08-31 | 2021-01-29 | 西安特锐德智能充电科技有限公司 | Power battery system integrating charging and battery replacing, working method and application |
| CN107521324A (en) * | 2017-09-15 | 2017-12-29 | 江西爱驰亿维实业有限公司 | Double source battery bag device and electric automobile |
| CN107539159B (en) * | 2017-09-18 | 2018-06-08 | 爱驰汽车有限公司 | Double source battery pack, management method and system and electric vehicle |
| CN109968961A (en) * | 2017-12-27 | 2019-07-05 | 奥动新能源汽车科技有限公司 | Electric car |
| CN108666638A (en) * | 2018-05-15 | 2018-10-16 | 东风裕隆汽车有限公司 | A kind of battery module and its Energy Management System and method |
| CN108749617B (en) * | 2018-06-11 | 2020-03-24 | 浙江衡远新能源科技有限公司 | Replaceable battery control system of electric automobile |
| CN110077235B (en) * | 2019-04-30 | 2021-01-12 | 东风汽车集团有限公司 | Static and dynamic switching system and method for expanding power supply |
| CN113954691A (en) * | 2021-09-15 | 2022-01-21 | 阿里巴巴达摩院(杭州)科技有限公司 | Battery control method, device, computer equipment and computer readable storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4035948A4 (en) * | 2020-12-16 | 2022-08-03 | Contemporary Amperex Technology Co., Limited | Power supply device, battery management system, power supply system, control method and medium |
| EP4043291A1 (en) * | 2020-12-16 | 2022-08-17 | Contemporary Amperex Technology Co., Limited | Power supply apparatus, battery management system, power supply system, control method and medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104709104A (en) | 2015-06-17 |
| CN106740206A (en) | 2017-05-31 |
| CN104709104B (en) | 2017-02-01 |
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