CN115042673A - Battery self-heating circuit with transformer and vehicle - Google Patents
Battery self-heating circuit with transformer and vehicle Download PDFInfo
- Publication number
- CN115042673A CN115042673A CN202210885481.3A CN202210885481A CN115042673A CN 115042673 A CN115042673 A CN 115042673A CN 202210885481 A CN202210885481 A CN 202210885481A CN 115042673 A CN115042673 A CN 115042673A
- Authority
- CN
- China
- Prior art keywords
- transformer
- battery
- branch
- capacitor
- series
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 59
- 239000003990 capacitor Substances 0.000 claims description 47
- 238000000034 method Methods 0.000 description 29
- 230000008569 process Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
Landscapes
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the application provides a take battery self-heating circuit and vehicle of transformer, wherein, the circuit includes: the power supply comprises a half-bridge circuit consisting of a high-voltage end, a low-voltage end, a transformer and a power switch, and a plurality of battery branches; a half-bridge circuit consisting of a plurality of battery branches and power switches is arranged between the high-voltage end and the low-voltage end; each battery branch is formed by connecting a plurality of batteries in series; the plurality of battery branches includes: a first battery branch and a second battery branch; a first end of a first secondary side of the transformer is connected with a series point of any two batteries in the first battery branch; the second end of the first secondary side of the transformer is connected with the series point of any two batteries in the second battery branch circuit; and the primary side of the transformer is connected with the midpoint of a half-bridge circuit formed by the power switches.
Description
Technical Field
The application relates to the technical field of new energy automobiles, in particular to a battery self-heating circuit with a transformer and a vehicle.
Background
The low-temperature performance of the new energy automobile power battery is poor, so that the battery temperature needs to be improved at a low temperature. The current technical scheme is as follows: after the cold zone liquid is heated by the methods of heat generation of a PTC (positive temperature coefficient) and an electric drive system and the like, the battery is heated by the cold zone liquid to realize indirect heating; the charging and discharging of the motor winding are realized through the motor controller, so that alternating current is generated in the battery, the battery is heated by the heating of the internal resistance of the battery, namely the internal resistance of the battery is directly heated. However, the method using indirect heating has the following disadvantages: a large amount of heat cannot be effectively transferred to the battery, but is dissipated to the environment, so that the efficiency is low; heat needs to be input into the battery through cold zone liquid, a battery external structure and the like, the temperature of the battery is slowly increased, and the condition of slow heat transfer exists; the temperature rise of the battery core close to the cold area liquid is fast, so that the battery is heated unevenly. The direct heating method has the following problems: the heating current frequency is low, the frequency of the directly heated alternating current is about 2kHz generally, the ears of people are very sensitive, and the generated noise causes great negative effects on drivers or passengers; the method is not easy to use in the running state of the vehicle, and is easy to cause torque jitter or influence the power output of the motor. Therefore, the above-mentioned battery heating method needs a heating circuit composed of devices with higher specification parameters to achieve a better heating effect, and the cost is higher.
Disclosure of Invention
In a first aspect, an object of the embodiments of the present application is to provide a battery self-heating circuit with a transformer and a vehicle, which can improve effective heating current and improve heating effect.
In a first aspect, an embodiment of the present application provides a battery self-heating circuit with a transformer, including:
the power supply comprises a half-bridge circuit consisting of a high-voltage end, a low-voltage end, a transformer and a power switch, and a plurality of battery branches;
a half-bridge circuit consisting of a plurality of battery branches and the power switch is arranged between the high-voltage end and the low-voltage end;
each battery branch is formed by connecting a plurality of batteries in series;
the plurality of battery branches includes: a first battery branch and a second battery branch;
a first end of a first secondary side of the transformer is connected with a series point of any two batteries in the first battery branch;
the second end of the first secondary side of the transformer is connected with the series point of any two batteries in the second battery branch circuit;
the primary side of the transformer is connected with the midpoint of a half-bridge circuit formed by the power switches,
the first end and the second end of the primary side of the transformer form a voltage difference.
In the implementation process, because of the impedance transformation effect of the transformer, the internal resistance of the battery is mapped to the primary side of the transformer according to the square of the number of turns of the primary side and the secondary side, so that the resistance of the primary side is greatly enhanced, the power factor of a system is improved, and the apparent power required by the system during heating is reduced. Due to the reduction of apparent power, the requirement of specification parameters of the power switch is correspondingly greatly reduced, and the cost is reduced accordingly.
Further, the battery self-heating circuit further comprises: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
one end of the series branch is connected with the midpoint of the half-bridge circuit.
In the implementation process, on one hand, the capacitor is used for preventing the bias saturation of the transformer; on the other hand, the resonant circuit is used for resonant with the leakage inductance of the transformer so as to improve the power factor and reduce the apparent power. Because the apparent power is reduced, the requirements of parameters such as capacitance value of the capacitor are correspondingly greatly reduced, and the cost is reduced accordingly.
Further, the battery self-heating circuit further comprises: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to a midpoint of at least one of the plurality of battery branches.
Further, the battery self-heating circuit further comprises: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the low voltage end.
Further, the battery self-heating circuit further comprises: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the high-pressure end.
Further, the battery self-heating circuit further comprises: a capacitor branch circuit;
the capacitor branch circuit is connected with a half-bridge circuit formed by the power switches in parallel;
and the primary side of the transformer is connected with the midpoint of the capacitor branch.
Furthermore, two ends of the capacitor are connected with two different name ends of the transformer.
In the implementation process, the primary current and the secondary current are superposed and enhanced, so that the heating power of one battery branch is increased.
Further, the plurality of battery branches further includes: a third battery branch;
the first end of the primary side is connected to the series point of any two batteries of the third battery branch.
In the implementation process, three battery branches are provided, the resistance of the primary side is increased due to the impedance effect of the transformer, the power factor of the circuit is improved, the apparent power of the circuit is reduced, and high-frequency current is generated by a half-bridge circuit consisting of power switches to heat the three battery branches.
Further, the leakage inductance of the transformer and the capacitor form a resonant circuit, and the resonant frequency of the resonant circuit is equal to the switching frequency of a half-bridge circuit formed by the power switches.
In the implementation process, on one hand, the capacitor is used for preventing the bias saturation of the transformer; on the other hand, the resonant circuit is used for resonant with the leakage inductance of the transformer so as to improve the power factor and reduce the apparent power.
Further, the leakage inductance of the transformer and the capacitor form a resonant circuit, and the resonant frequency of the resonant circuit is smaller than the switching frequency of a half-bridge circuit formed by the power switches.
In the implementation process, the capacitor is used for isolating direct-current voltage, and bias magnetic saturation of the transformer is avoided.
Further, the turn ratio of the primary side of the transformer to the secondary side of the transformer is greater than 1
In the implementation process, because of the impedance transformation effect of the transformer, the internal resistance of the battery is mapped to the primary side of the transformer according to the square proportion of the turn ratio, the resistance of the primary side is greatly enhanced, the power factor of the circuit is improved, and the apparent power of the circuit is reduced.
Further, the capacity ratio of the first battery branch to the second battery branch is: (k + 1)/k; and k is the turn ratio of the primary side of the transformer to the secondary side of the transformer.
In the implementation process, the first battery branch and the second battery branch uniformly heat.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the above-described techniques.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 2 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 3 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 4 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 5 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 6 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure;
fig. 7 is another schematic structural diagram of a battery self-heating circuit with a transformer according to an embodiment of the present disclosure.
Icon: a Tx-transformer; u1 — first battery module; u2 — a second battery module; u3-a third battery module; u4-fourth battery module; u5-fifth battery module; u6-sixth battery module; lp-primary side; ls 1-first secondary side; ls 2-second minor edge; ls 3-third minor edge; q1-first power switch; q2 — second power switch; cr-capacitance; cr1 — first capacitance; cr2 — second capacitance; Cdc-DC bus capacitor
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
Example 1
Referring to fig. 1 to 5, an embodiment of the present application provides a battery self-heating circuit with a transformer Tx, including:
the high-voltage end, the low-voltage end, the transformer Tx, a half-bridge circuit formed by power switches, and a plurality of battery branches;
a half-bridge circuit consisting of a plurality of battery branches and power switches is arranged between the high-voltage end and the low-voltage end;
illustratively, the half-bridge circuit is composed of a first power switch Q1, a second power switch Q2.
Each battery branch is formed by connecting a plurality of batteries in series;
the plurality of battery branches includes: a first battery branch and a second battery branch;
in fig. 1, the first battery branch includes: a first battery module U1 and a second battery module U2; the second battery branch includes: a third battery module U3 and a fourth battery module U4.
A first end of the first secondary side Ls1 of the transformer Tx is connected to a series point of any two batteries in the first battery branch;
the second end of the first secondary side Ls1 of the transformer Tx is connected to the series point of any two batteries in the second battery branch;
the series connection point of any two batteries of the primary Lp of the transformer Tx and one of the battery branches is connected,
the first end and the second end of the primary side of the transformer form a voltage difference.
In the implementation process, because of the impedance transformation effect of the transformer Tx, the internal resistance of the battery is mapped to the primary side Lp of the transformer Tx according to the square ratio of the number of turns of the primary side Lp and the secondary side, so that the resistance of the primary side Lp is greatly enhanced, the power factor of a system is improved, and the apparent power required by the system during heating is reduced. Due to the reduction of apparent power, the requirement of specification parameters of the power switch is correspondingly greatly reduced, and the cost is reduced accordingly.
Referring to fig. 1, in one possible embodiment, the battery self-heating circuit further includes: a capacitance Cr;
the capacitor Cr and the primary side Lp of the transformer Tx form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to a midpoint of at least one of the plurality of battery branches.
Referring to fig. 2, in one possible embodiment, the battery self-heating circuit further includes: a capacitance Cr;
the capacitor Cr and the primary side Lp of the transformer Tx form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the low voltage end.
Referring to fig. 3, in one possible embodiment, the battery self-heating circuit further includes: a capacitance Cr;
the capacitor Cr and the primary side Lp of the transformer Tx form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the high-pressure end.
Referring to fig. 4, in one possible embodiment, the battery self-heating circuit further includes: a capacitor branch circuit;
exemplarily, the capacitive branch comprises a first capacitance Cr1 and Cr 2;
the capacitor branch circuit is connected with a half-bridge circuit formed by the power switches in parallel;
the primary side of the transformer Tx is connected to the midpoint of the capacitive branch.
In the implementation process, on one hand, the isolation of the primary side and the secondary side of the transformer Tx is realized. On the other hand the problem of initialization transients is small.
It should be noted that the capacitor Cr is not necessary, and referring to fig. 5, when there is no capacitor Cr, the circuit does not resonate, the half-bridge circuit adopts a complementary conduction mode with a small dead time, or a discontinuous conduction mode with a large dead time and discontinuous leakage current of the transformer Tx, and the battery can be heated, but there is a risk of magnetic biasing saturation of the transformer Tx. This risk can be avoided if closed loop control of the transformer Tx excitation current is now possible, and this can be achieved.
Furthermore, the battery pack is connected to a vehicle high-voltage bus through a relay, and the bus is connected with electric equipment such as a three-phase inverter.
The working condition of the battery self-heating circuit with the transformer Tx is irrelevant to the state of a vehicle, and the battery self-heating circuit with the transformer Tx can work normally no matter the vehicle is parked and connected to charge a charging pile or runs normally.
Referring to fig. 1-5, in one possible embodiment, the battery self-heating circuit further comprises: a capacitance Cdc; the capacitor Cdc is connected in parallel with the plurality of battery branches.
In the implementation process, the capacitor Cdc can absorb the pulse current generated in the operation of the half-bridge circuit. Due to the fact that apparent power is reduced, requirements of parameters such as capacitance value of the capacitor Cdc are correspondingly greatly reduced, and cost is reduced accordingly.
In one possible embodiment, the first battery branch is formed by two batteries connected in series;
the second battery branch is formed by connecting two batteries in series.
Referring to fig. 1-5, the first battery branch is formed by connecting the first battery module U1 and the second battery module U2 in series; the second battery branch is formed by connecting the third battery module U3 and the fourth battery module U4 in series.
In the implementation process, the battery is divided into two parallel parts, each parallel part is divided into two parts which are connected in series with the same size, height and height, and the parts are equivalent to two half-bridge circuits, and the first secondary side Ls1 of the transformer Tx crosses the middle point of the two half-bridge circuits.
Further, two ends of the capacitor Cr are connected to two different-name ends of the transformer Tx.
In the implementation process, two ends of the capacitor Cr are connected to two different name ends of the transformer Tx, so that the primary Lp current and the secondary Lp current are superimposed and enhanced, and the heating power of one half-bridge circuit of the battery is increased.
Referring to fig. 3, another connection method for the same-name terminal of the transformer Tx is shown.
In one possible embodiment, the plurality of battery branches further includes: a third battery branch;
the first end of the primary side Lp is connected to the series point of any two batteries of the third battery branch.
In a possible embodiment, the leakage inductance of the transformer Tx and the capacitance Cr form a resonant circuit, and the resonant frequency of the resonant circuit is equal to the switching frequency of the half-bridge circuit formed by the power switches.
It is understood that, in practical applications, the resonant frequency of the resonant circuit and the switching frequency of the half-bridge circuit formed by the power switches may have a certain error.
Illustratively, for example, the switching frequency of the first power switch Q1 and the second power switch Q2 is 20kHz, and the resonant frequency of the transformer Tx and the capacitor Cr is 20 kHz.
Preferably, the turn ratio of the primary side Lp of the transformer Tx to the secondary side of the transformer Tx is greater than 1.
Further, in order to make the first battery branch and the second battery branch uniformly generate heat, the capacity ratio of the first battery branch to the second battery branch is: (k + 1)/k; where k is the turn ratio of the primary side Lp of the transformer Tx to the secondary side of the transformer Tx.
As shown in fig. 1, the half-bridge heating current of the battery on the left side in the figure is the same-phase superposition of the primary Lp current and the secondary current, only the secondary current exists on the right side, if k is 5, the heating current ratio of the left parallel part and the right parallel part is 6:5, the capacity of the left parallel part and the right parallel part should be designed to be 6:5, and thus the batteries on the two sides can generate heat in a balanced manner. The specific derivation process is as follows:
the internal resistance of the battery branch is inversely proportional to the capacity of the battery branch, assuming a first battery branch capacity: the capacity of the second battery branch is m:1, then the internal resistance of the first battery branch is: the internal resistance of the second battery branch is 1: m. Due to the heating current of the first battery branch: since the heating current of the second battery arm is (k +1): k, if the heating power per unit capacity of the battery is the same, it is required to:
after finishing, the following can be obtained:
in conjunction with the battery self-heating circuit with transformer Tx in fig. 1, the present application provides an operating method of the circuit: when the battery needs to be heated, the first power switch Q1 and the second power switch Q2 are alternately turned on in a complementary manner at a certain switching frequency and a certain duty ratio. At this time, under the excitation of the square wave voltage generated by the half-bridge circuit formed by the first power switch Q1 and the second power switch Q2, the leakage inductance of the transformer Tx resonates with the capacitor Cr, and a relatively small resonant current is generated on the primary side Lp of the transformer Tx. The secondary current is multiplied by several times compared to the primary current, so that a large alternating current with high frequency is generated between the midpoints of the two "battery half bridges". The high-frequency current can generate large heat power through the internal resistance heating of the battery, and the battery is rapidly heated.
In the above implementation, the capacitor Cdc is used to sink the pulse current.
In a possible embodiment, the leakage inductance of the transformer Tx and the capacitance Cr form a resonant circuit, and the resonant frequency of the resonant circuit is lower than the switching frequency of the half-bridge circuit formed by the power switches.
In the implementation process, the capacitor Cr is used for isolating direct-current voltage, so that bias saturation of the transformer Tx is avoided.
Referring to fig. 6, in one possible embodiment, the plurality of battery branches further includes: a third battery branch; the first end of the primary side Lp is connected to the series point of any two batteries of the third battery branch.
The third battery branch is formed by connecting the fifth battery module U5 and the sixth battery module U6 in series.
In the implementation process, three battery branches are provided, the impedance of a primary side Lp is increased due to the impedance transformation effect of a transformer Tx, the power factor of a circuit is improved, the apparent power of the circuit is reduced, and high-frequency current is generated by a half-bridge circuit consisting of power switches to heat the three battery branches.
In one possible embodiment, the transformer Tx comprises: a plurality of secondary edges;
the two ends of each secondary side of the plurality of secondary sides are respectively connected between any two batteries in the two battery branches;
referring to fig. 7, the fourth battery branch and the fifth battery branch include four batteries connected in series; the transformer Tx is provided with a primary side Lp and three secondary sides; illustratively, the plurality of secondary sides includes a first secondary side Ls1, a second secondary side Ls2, and a third secondary side Ls 3.
Illustratively, the two battery branches connected by each secondary side have the same structure; the two connection points of each secondary side are identical at the location of the battery branches to which they are connected.
Wherein the second secondary side Ls2 is connected between the first and second batteries of the fourth and fifth battery branches; the third secondary side Ls3 is connected between the third and fourth batteries of the fourth and fifth battery branches.
It should be noted that, on the basis of the embodiments of the present application, a design manner of connecting a plurality of battery branches in series and in parallel may also be adopted for the battery pack.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (12)
1. A battery self-heating circuit with a transformer, comprising:
the power supply comprises a half-bridge circuit consisting of a high-voltage end, a low-voltage end, a transformer and a power switch, and a plurality of battery branches;
a half-bridge circuit consisting of a plurality of battery branches and power switches is arranged between the high-voltage end and the low-voltage end;
each battery branch is formed by connecting a plurality of batteries in series;
the plurality of battery branches includes: a first battery branch and a second battery branch;
a first end of a first secondary side of the transformer is connected with a series point of any two batteries in the first battery branch;
the second end of the first secondary side of the transformer is connected with the series point of any two batteries in the second battery branch circuit;
the primary side of the transformer is connected with the midpoint of a half-bridge circuit formed by the power switches, and the first end and the second end of the primary side of the transformer form a pressure difference.
2. The transformer-equipped battery self-heating circuit according to claim 1, further comprising: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to a midpoint of at least one of the plurality of battery branches.
3. The transformer-equipped battery self-heating circuit according to claim 1, further comprising: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the low voltage end.
4. The transformer-equipped battery self-heating circuit according to claim 1, further comprising: a capacitor;
the capacitor and the primary side of the transformer form a series branch;
the first end of the series branch is connected with the midpoint of a half-bridge circuit formed by the power switches;
the second end of the series branch is connected to the high-pressure end.
5. The transformer-equipped battery self-heating circuit according to claim 1, further comprising: a capacitor branch circuit;
the capacitor branch circuit is connected with a half-bridge circuit formed by the power switches in parallel;
and the primary side of the transformer is connected with the midpoint of the capacitor branch.
6. The battery self-heating circuit according to claim 2, wherein two ends of the capacitor are connected to two different name ends of the transformer.
7. The battery self-heating circuit of claim 5,
the plurality of battery branches further includes: a third battery branch;
the first end of the primary side is connected to the series point of any two batteries of the third battery branch.
8. The transformer-equipped battery self-heating circuit according to claim 2, wherein the leakage inductance of the transformer and the capacitor constitute a resonant circuit, and a resonant frequency of the resonant circuit is equal to a switching frequency of a half-bridge circuit constituted by the power switches.
9. The transformer-equipped battery self-heating circuit according to claim 7, wherein the leakage inductance of the transformer and the capacitor constitute a resonant circuit having a resonant frequency lower than a switching frequency of a half-bridge circuit constituted by the power switches.
10. The transformer-equipped battery self-heating circuit according to any one of claims 1 to 8,
the turn ratio of the primary side of the transformer to the secondary side of the transformer is greater than 1.
11. The transformer-equipped battery self-heating circuit according to claim 9, wherein the capacity ratio of the first battery branch and the second battery branch is: (k + 1)/k; and k is the turn ratio of the primary side of the transformer to the secondary side of the transformer.
12. A vehicle characterized by comprising the transformer-equipped battery self-heating circuit according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210885481.3A CN115042673A (en) | 2022-07-26 | 2022-07-26 | Battery self-heating circuit with transformer and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210885481.3A CN115042673A (en) | 2022-07-26 | 2022-07-26 | Battery self-heating circuit with transformer and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115042673A true CN115042673A (en) | 2022-09-13 |
Family
ID=83166456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210885481.3A Pending CN115042673A (en) | 2022-07-26 | 2022-07-26 | Battery self-heating circuit with transformer and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115042673A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7357175B1 (en) | 2022-12-05 | 2023-10-05 | 正一 田中 | electric propulsion system |
| WO2024087398A1 (en) * | 2022-10-26 | 2024-05-02 | 广汽埃安新能源汽车股份有限公司 | Transformer-based battery heating circuit, and electric vehicle |
-
2022
- 2022-07-26 CN CN202210885481.3A patent/CN115042673A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087398A1 (en) * | 2022-10-26 | 2024-05-02 | 广汽埃安新能源汽车股份有限公司 | Transformer-based battery heating circuit, and electric vehicle |
| JP7357175B1 (en) | 2022-12-05 | 2023-10-05 | 正一 田中 | electric propulsion system |
| WO2024122078A1 (en) * | 2022-12-05 | 2024-06-13 | 正一 田中 | Electric propulsion system |
| JP2024081102A (en) * | 2022-12-05 | 2024-06-17 | 正一 田中 | Electric Propulsion System |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115042673A (en) | Battery self-heating circuit with transformer and vehicle | |
| Xuan et al. | A novel three-level CLLC resonant DC–DC converter for bidirectional EV charger in DC microgrids | |
| CN102195506B (en) | The system and method for inactive matrix converter | |
| US20110139771A1 (en) | Series-Parallel Resonant Inverters | |
| Mohamed et al. | Optimal design of high frequency H-bridge inverter for wireless power transfer systems in EV applications | |
| Takasaki et al. | Wireless power transfer system for gate power supplies of modular multilevel converters | |
| CN115465154A (en) | Battery heating circuit and electric vehicle based on transformer | |
| CN217170494U (en) | Battery self-heating circuit and vehicle | |
| Bharathidasan et al. | Design and implementations of high step‐up non‐isolated DC‐DC converters for electric vehicles application | |
| CN113950790A (en) | DC voltage converter having a secondary resonant circuit capacitor, and method for operating a DC voltage converter | |
| Grazian et al. | Compensation network for a 7.7 kw wireless charging system that uses standardized coils | |
| CN217553739U (en) | Battery self-heating circuit with transformer and vehicle | |
| Li et al. | Realization of CC and CV mode in IPT system based on the switching of doublesided LCC and LCC-S compensation network | |
| Lu et al. | Research on seamless transfer from CC to CV modes for IPT EV charging system based on double-sided LCC compensation network | |
| Agarwal et al. | A double boost 9‐level switched capacitor‐based multilevel inverter for photovoltaic applications | |
| Meher et al. | A two-stage standard on-board electric vehicle charger with minimum switch count | |
| Lin et al. | Analysis and implementation of a three‐level hybrid dc–dc converter with the balanced capacitor voltages | |
| Zhao et al. | Design and Implementation of Double‐Sided LCL Variable Compensation Topology of MCR‐WPT System | |
| CN205901602U (en) | Capacitive load high frequency high voltage power supply | |
| TW201117545A (en) | Resonance circuit structure of DC to AC converter for DC chain voltage control | |
| CN114801887A (en) | Battery self-heating circuit and vehicle | |
| Qayamuddin et al. | A novel control strategy for dual active bridge bidirectional converter for electric vehicle application | |
| CN218569001U (en) | Power battery alternating current heating circuit and electric automobile | |
| Kumar et al. | Harmonic modeling and performance analysis of the basic IPT topologies under varying operating conditions | |
| CN217197846U (en) | Circuit for heating battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Applicant after: GAC AION NEW ENERGY AUTOMOBILE Co.,Ltd. Address before: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Applicant before: GAC AION New Energy Vehicle Co.,Ltd. Country or region before: China |