CN113459812A - Pre-charging device, power battery and pre-charging method - Google Patents

Pre-charging device, power battery and pre-charging method Download PDF

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Publication number
CN113459812A
CN113459812A CN202110780105.3A CN202110780105A CN113459812A CN 113459812 A CN113459812 A CN 113459812A CN 202110780105 A CN202110780105 A CN 202110780105A CN 113459812 A CN113459812 A CN 113459812A
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CN
China
Prior art keywords
switching element
charging
load
loop
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110780105.3A
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Chinese (zh)
Inventor
史登瑞
宋琳
王宗明
夏宝印
孙承金
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Yuanqi New Power Technology Co ltd
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Shandong Yuanqi New Power Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Yuanqi New Power Technology Co ltd filed Critical Shandong Yuanqi New Power Technology Co ltd
Priority to CN202110780105.3A priority Critical patent/CN113459812A/en
Publication of CN113459812A publication Critical patent/CN113459812A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention belongs to the field of new energy automobiles, and provides a pre-charging device, a power battery and a pre-charging method. The pre-charging device comprises a first switch element, a pre-charging resistor, a second switch element, a first diode and a second diode; one end of the first switch element is connected to the anode of the power battery, the other end of the first switch element is connected to a first load end, and the first load end is a main loop load end; one end of the pre-charging resistor is connected to a connecting point of the positive electrode of the power battery and the first switching element, and the other end of the pre-charging resistor is connected with the second switching element in series; the other end of the second switching element is correspondingly connected with a first load end and a second load end through a first diode and a second diode respectively, and the second load end is simultaneously connected with the vehicle-mounted charger loop and the DC-DC converter loop.

Description

Pre-charging device, power battery and pre-charging method
Technical Field
The invention belongs to the field of new energy automobiles, and particularly relates to a pre-charging device, a power battery and a pre-charging method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Usually, a main switch is connected in series between a load end of a battery pack of a new energy automobile and the battery pack, a large current can pass through the main switch at the moment of closing, and a pre-charging loop needs to be added to avoid the large current at the moment. The pre-charging device can limit the charging current of the capacitive load, but the charging resistor of the pre-charging device is generally a winding resistor of a cement shell or an aluminum profile shell, so that the charging resistor is easily burnt and the cost is very high. Although the prior art provides a power supply loop of an electric automobile, and a pre-charging circuit is realized by using a relay to control a charging resistor to limit the charging current of a capacitive load of a main loop, the inventor finds that the prior scheme cannot limit the capacitive load current of other loops, so that the problems of easy burning of switches of an on-board charger loop and a DC-DC converter loop, high failure rate of a battery pack and high maintenance cost exist.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a pre-charging device, a power battery and a pre-charging method, which can avoid the problem that switches of an on-vehicle charger loop and a DC-DC converter loop are easy to burn, and reduce the failure rate and the maintenance cost of a battery pack.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a precharge device including a first switching element, a precharge resistor, a second switching element, a first diode, and a second diode;
one end of the first switch element is connected to the anode of the power battery, the other end of the first switch element is connected to a first load end, and the first load end is a main loop load end;
one end of the pre-charging resistor is connected to a connecting point of the positive electrode of the power battery and the first switching element, and the other end of the pre-charging resistor is connected with the second switching element in series;
the other end of the second switching element is correspondingly connected with a first load end and a second load end through a first diode and a second diode respectively, and the second load end is simultaneously connected with the vehicle-mounted charger loop and the DC-DC converter loop.
In one embodiment, the first switching element and the second switching element are both connected to a controller.
In one embodiment, the controller is configured to receive a pre-charge pulse width modulation signal sent by a charger, and generate a pre-charge control command according to the pre-charge pulse width modulation signal to control on and off of the first switching element and the second switching element.
In one embodiment, the first switching element and the second switching element are both contactors.
In one embodiment, the first switching element and the second switching element are both power switching tubes.
In one embodiment, the pre-charge resistor is a wire resistor.
In one embodiment, the first load terminal is connected to a capacitive load.
In one embodiment, the second load terminal is connected to a capacitive load.
A second aspect of the present invention provides a precharge method of the precharge device as described above, including:
the first switching element and the second switching element are switched on and off according to the pre-charging control instruction; wherein, the pre-charging control command is generated according to a pre-charging pulse width modulation signal sent by the charger;
controlling the first switching element to be switched off and the second switching element to be switched on, and pre-charging the main loop, the vehicle-mounted charger loop and the DC-DC converter loop;
and after the pre-charging is finished, the second switching element is controlled to be switched off, and the first switching element is controlled to be switched on.
A third aspect of the invention provides a power cell comprising a pre-charging arrangement as described above.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention has simple circuit structure through the circuit formed by the switch element, the pre-charging resistor and the diode, reduces the cost of the pre-charging device while improving the reliability of the pre-charging device, and adds the branch of the pre-charging circuit at the rear end of the charging resistor to respectively enter the charger circuit and the DC-DC converter circuit, thereby achieving the purpose of pre-charging the charger circuit and the DC-DC converter circuit.
(2) The other end of the second switch element is correspondingly connected with the first load end and the second load end through the first diode and the second diode respectively, and the second load end is simultaneously connected with the vehicle-mounted charger loop and the DC-DC converter loop, so that the reliability of the pre-charging loop is improved, the service life of the load switch is prolonged, and the failure rate and the maintenance cost of the battery pack are reduced.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a pre-charging device according to an embodiment of the invention.
Wherein, 1, a power battery; 2. a first switching element; 3. a pre-charge resistor; 4. a second switching element; 5. a second load terminal; 6-1, a first diode; 6-2, a second diode; 7. a first load side.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
< Pre-charging device >
Referring to fig. 1, the present embodiment provides a precharge apparatus including a first switching element 2, a precharge resistor 3, a second switching element 4, a first diode 6-1, and a second diode 6-2.
In specific implementation, one end of the first switching element 2 is connected to the positive electrode of the power battery 1, the other end is connected to the first load terminal 7, and the first load terminal 73 is a main loop load terminal; one end of the pre-charging resistor is connected to the connection point of the positive electrode of the power battery 1 and the first switch element 2, and the other end of the pre-charging resistor is connected in series with the second switch element 4; the other end of the second switch element 4 is correspondingly connected with a first load end 7 and a second load end 5 through a first diode 6-1 and a second diode 6-2, and the second load end 5 is simultaneously connected with an on-vehicle charger loop and a DC-DC converter loop.
In the embodiment, the power battery is used for providing power for the new energy electric automobile.
The first diode and the second diode are used for preventing reverse charging from burning the pre-charging loop device.
It should be noted here that, the specific types of the power battery and the first diode and the second diode can be set by those skilled in the art according to actual specific situations, and will not be described in detail here.
In one or more embodiments, the first switching element and the second switching element are both connected to a controller. The controller is used for receiving a pre-charging pulse width modulation signal sent by a charger and generating a pre-charging control instruction according to the pre-charging pulse width modulation signal so as to control the on-off of the first switching element and the second switching element.
It is understood that the controller may be implemented by other chips with programming capability, such as a PWM controller, and those skilled in the art can specifically configure the controller according to actual situations, and will not be described in detail herein.
In the present embodiment, the first switching element is used to cut off or close the energy output of the power battery;
the second switch element is used for controlling the starting or the disconnection of the loop in the pre-charging device.
In one embodiment, the first switching element and the second switching element are both contactors.
In other embodiments, the first switching element and the second switching element are both power switching transistors, such as MOS transistors.
It should be noted here that the first switching element and the second switching element may be implemented by junction field effect transistors (JFET transistors), and those skilled in the art may specifically select the first switching element and the second switching element according to actual situations, and will not be described here again.
In a specific implementation, the pre-charge resistor is a routing resistor. For example: the winding resistance of pre-charging resistance, cement shell or aluminium alloy casing.
Specifically, the first load end is connected with a capacitive load. The second load end is connected with a capacitive load.
In the embodiment, the circuit composed of the switching element, the pre-charging resistor and the diode improves the reliability of the pre-charging device and reduces the cost of the pre-charging device, and the pre-charging circuit branch is added at the rear end of the charging resistor and respectively enters the charger circuit and the DC-DC converter circuit, so that the aim of pre-charging the charger circuit and the DC-DC converter circuit is fulfilled.
< method for precharging A precharging device >
A second aspect of the present invention provides a precharge method of the precharge device as described above, including:
the first switching element and the second switching element are switched on and off according to the pre-charging control instruction; wherein, the pre-charging control command is generated according to a pre-charging pulse width modulation signal sent by the charger;
controlling the first switching element to be switched off and the second switching element to be switched on, and pre-charging the main loop, the vehicle-mounted charger loop and the DC-DC converter loop;
and after the pre-charging is finished, the second switching element is controlled to be switched off, and the first switching element is controlled to be switched on.
The precharge method of the present embodiment controls the first switching element and the second switching element according to a precharge control command so that the main circuit, the on-vehicle charger circuit, and the DC-DC converter circuit are precharged when the first switching element is turned off and the second switching element is turned on; after the pre-charging is finished, the second switching element is controlled to be switched off, and the first switching element is controlled to be switched off, so that the problem that switches of a charger loop and a DC-DC converter loop are easy to burn is solved, and the failure rate and the maintenance cost of the battery pack are reduced.
< Power Battery >
In one or more embodiments, there is also provided a power battery comprising a pre-charging device as described above.
The specific structure of the pre-charging device is as described above, and will not be described in detail here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A precharge device is characterized by comprising a first switch element, a precharge resistor, a second switch element, a first diode and a second diode;
one end of the first switch element is connected to the anode of the power battery, the other end of the first switch element is connected to a first load end, and the first load end is a main loop load end;
one end of the pre-charging resistor is connected to a connecting point of the positive electrode of the power battery and the first switching element, and the other end of the pre-charging resistor is connected with the second switching element in series;
the other end of the second switching element is correspondingly connected with a first load end and a second load end through a first diode and a second diode respectively, and the second load end is simultaneously connected with the vehicle-mounted charger loop and the DC-DC converter loop.
2. The precharge apparatus as claimed in claim 1, wherein said first switching element and said second switching element are connected to a controller.
3. The pre-charging device as claimed in claim 2, wherein the controller is configured to receive a pre-charging pulse width modulation signal from the charger and generate a pre-charging control command according to the pre-charging pulse width modulation signal to control the on/off of the first switching element and the second switching element.
4. The precharge apparatus as claimed in claim 1, wherein said first switching element and said second switching element are both contactors.
5. The precharge device as claimed in claim 1, wherein said first switching element and said second switching element are both power switching tubes.
6. The pre-charge apparatus of claim 1, wherein the pre-charge resistor is a wire resistor.
7. The pre-charge apparatus of claim 1, wherein the first load terminal is connected to a capacitive load.
8. The pre-charge apparatus of claim 1, wherein the second load terminal is connected to a capacitive load.
9. A precharge method of a precharge device according to any one of claims 1 to 8, comprising:
the first switching element and the second switching element are switched on and off according to the pre-charging control instruction; wherein, the pre-charging control command is generated according to a pre-charging pulse width modulation signal sent by the charger;
controlling the first switching element to be switched off and the second switching element to be switched on, and pre-charging the main loop, the vehicle-mounted charger loop and the DC-DC converter loop;
and after the pre-charging is finished, the second switching element is controlled to be switched off, and the first switching element is controlled to be switched on.
10. A power cell comprising a pre-charging device according to any one of claims 1 to 8.
CN202110780105.3A 2021-07-09 2021-07-09 Pre-charging device, power battery and pre-charging method Pending CN113459812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110780105.3A CN113459812A (en) 2021-07-09 2021-07-09 Pre-charging device, power battery and pre-charging method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110780105.3A CN113459812A (en) 2021-07-09 2021-07-09 Pre-charging device, power battery and pre-charging method

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102769315A (en) * 2012-07-19 2012-11-07 隆鑫通用动力股份有限公司 Pre-charging control device for motor controller of electric vehicle and electric vehicle using pre-charging control device
CN105109347A (en) * 2015-09-18 2015-12-02 惠州市亿能电子有限公司 High-voltage power-on circuit of electric automobile, and control method of high-voltage power-on circuit
DE102017010673A1 (en) * 2017-11-17 2018-05-30 Daimler Ag Electrical circuit arrangement and method for precharging a DC link capacitance of a DC link of the electrical circuit arrangement
CN108512423A (en) * 2018-05-23 2018-09-07 威腾电气集团股份有限公司 A kind of vehicle-mounted DCDC power supplys of high-efficiency high-power
CN210881687U (en) * 2019-11-05 2020-06-30 江铃汽车股份有限公司 High voltage control system
CN212921140U (en) * 2020-09-10 2021-04-09 芜湖天量电池系统有限公司 Multi-load pre-charging circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102769315A (en) * 2012-07-19 2012-11-07 隆鑫通用动力股份有限公司 Pre-charging control device for motor controller of electric vehicle and electric vehicle using pre-charging control device
CN105109347A (en) * 2015-09-18 2015-12-02 惠州市亿能电子有限公司 High-voltage power-on circuit of electric automobile, and control method of high-voltage power-on circuit
DE102017010673A1 (en) * 2017-11-17 2018-05-30 Daimler Ag Electrical circuit arrangement and method for precharging a DC link capacitance of a DC link of the electrical circuit arrangement
CN108512423A (en) * 2018-05-23 2018-09-07 威腾电气集团股份有限公司 A kind of vehicle-mounted DCDC power supplys of high-efficiency high-power
CN210881687U (en) * 2019-11-05 2020-06-30 江铃汽车股份有限公司 High voltage control system
CN212921140U (en) * 2020-09-10 2021-04-09 芜湖天量电池系统有限公司 Multi-load pre-charging circuit

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Application publication date: 20211001