阅读说明：本技术 一种电池充放电控制系统、方法及装置 (Battery charging and discharging control system, method and device ) 是由 彭杨茗 刘爽 周坤 朱立宾 曹雨奇 于 2021-06-29 设计创作，主要内容包括：本发明实施例提供了一种电池充放电控制系统、方法及装置,该控制系统包括：第一电池组、第二电池组、第一开关、第二开关、第三开关、电容以及电池管理装置。通过控制改变第一开关、第二开关以及第三开关,使电容对第一电池组和第二电池组的放电,以及第一电池组和第二电池组对电容的放电,来使得第一电池组和第二电池组的温度升高至预设温度范围内,由于是直接对电池组内部进行加热,进而缩短了加热过程的时间,并减少热量散失,实现了提高加热效率的技术效果。(The embodiment of the invention provides a battery charging and discharging control system, a method and a device, wherein the control system comprises: the battery management device comprises a first battery pack, a second battery pack, a first switch, a second switch, a third switch, a capacitor and a battery management device. The first switch, the second switch and the third switch are changed through control, so that the capacitor discharges the first battery pack and the second battery pack, and the first battery pack and the second battery pack discharge the capacitor, so that the temperature of the first battery pack and the temperature of the second battery pack rise to a preset temperature range.)

1. A battery charge and discharge control system, the system comprising:

the battery management device comprises a first battery pack, a second battery pack, a first switch, a second switch, a third switch, a capacitor and a battery management device;

the first battery pack, the second battery pack, the first switch, the second switch, the third switch and the capacitor are all connected with the battery management device; the second switch selectively connects the first battery pack with the second battery pack; the first switch may selectively connect like poles of the first battery pack and the second battery pack, and the third switch may selectively connect the other like pole of the first battery pack and the second battery pack;

after receiving the heating signal, the battery management device respectively controls the second switches to be closed and controls the first switches and the third switches to be opened, so that the first battery pack and the second battery pack charge the capacitor; and after the battery management device judges that charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack.

2. The system of claim 1, further comprising:

and the voltage sensor is connected with the battery management device and used for acquiring the actual voltages corresponding to the first battery pack, the second battery pack and the capacitor and feeding back the actual voltages to the battery management device.

3. The system of claim 2, wherein the battery management means is to:

upon detection of: and when the actual voltage of the first battery pack plus the actual voltage of the second battery pack is equal to the actual voltage of the capacitor, judging that the charging is finished.

4. The system of claim 2, wherein the battery management device is further configured to:

upon detection of: and when the actual voltage of the first battery pack and the second battery pack after being connected in parallel is equal to the actual voltage of the capacitor, the completion of discharging is judged.

5. The system of claim 1, further comprising:

and the temperature sensor is connected with the battery management device and used for acquiring the temperature data of the first battery pack and the second battery pack and feeding the temperature data back to the battery management device.

6. The system of claim 5, wherein the battery management device is further configured to:

upon detection of: and when the temperature data is within a preset temperature range, judging to trigger the termination condition.

7. The system of claim 1, wherein the system further comprises:

one end of the first fuse is connected with the third switch, and the other end of the first fuse is connected with the second battery pack and used for preventing the second battery pack from being short-circuited;

the first fuse is also connected with the battery management device and used for feeding back a first failure state to the battery management device;

one end of the second fuse is connected with the first switch, and the other end of the second fuse is connected with the first battery pack and used for preventing the first battery pack from being short-circuited;

the second fuse is also connected with the battery management device and is used for feeding back a second failure state to the battery management device.

8. A battery charge/discharge control method applied to the system according to any one of claims 1 to 7, the method comprising:

after the heating signal is received, the second switches are respectively controlled to be closed, and the first switch and the third switch are controlled to be opened, so that the first battery pack and the second battery pack charge the capacitor; after charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack;

and after the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until a termination condition is triggered.

9. A battery charge/discharge control device applied to the system according to any one of claims 1 to 7, characterized in that the device comprises:

a signal acquisition unit and a control unit;

the signal acquisition unit is used for receiving the heating signal and sending the heating signal to the control unit;

the control unit is used for controlling the second switch to be closed and controlling the first switch and the third switch to be opened so as to enable the first battery pack and the second battery pack to charge the capacitor; after charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack;

and after the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until a termination condition is triggered.

10. A power supply apparatus of an electric vehicle, comprising: first group battery, second group battery, first switch, second switch, third switch, electric capacity and battery management device, wherein, battery management device includes: memory, processor and code stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1-7 when executing the code.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a battery charging and discharging control system, method and device.

Background

When the ambient temperature is lower, the temperature of the power battery on the electric automobile is also lower, and in order to improve the service life and the working efficiency of the power battery, the power battery cannot be directly charged and discharged, the power battery needs to be heated first, and the power battery is used after the temperature of the power battery is increased to a normal temperature range.

In the related art, the battery is usually heated by external heating, such as by using a water cooling system or an electric heating system, to heat the battery core of the power battery. Because these modes are the temperature that improves the inside chemical reaction material of electricity core through the mode of heat transfer, when heating, heat source, heat conduction pad, battery module shell and electricity core shell etc. can lose the heat, lead to when heating power battery, the response speed of heating is slow, inefficiency.

Disclosure of Invention

The embodiment of the invention provides a battery charging and discharging control system, method and device, and solves the technical problem of low heating efficiency when a power battery is heated in the related art.

In a first aspect, the present invention provides a battery charge and discharge control system according to an embodiment of the present invention, including: the battery management device comprises a first battery pack, a second battery pack, a first switch, a second switch, a third switch, a capacitor and a battery management device; the first battery pack, the second battery pack, the first switch, the second switch, the third switch and the capacitor are all connected with the battery management device; the second switch selectively connects the first battery pack with the second battery pack; the first switch may selectively connect like poles of the first battery pack and the second battery pack, and the third switch may selectively connect the other like pole of the first battery pack and the second battery pack; after receiving the heating signal, the battery management device respectively controls the second switches to be closed and controls the first switches and the third switches to be opened, so that the first battery pack and the second battery pack charge the capacitor; and after the battery management device judges that charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack.

Preferably, the system further comprises: and the voltage sensor is connected with the battery management device and used for acquiring the actual voltages corresponding to the first battery pack, the second battery pack and the capacitor and feeding back the actual voltages to the battery management device.

Preferably, the battery management device is configured to: upon detection of: and when the actual voltage of the first battery pack plus the actual voltage of the second battery pack is equal to the actual voltage of the capacitor, judging that the charging is finished.

Preferably, the battery management apparatus is further configured to: upon detection of: and when the actual voltage of the first battery pack and the second battery pack after being connected in parallel is equal to the actual voltage of the capacitor, the completion of discharging is judged.

Preferably, the system further comprises: and the temperature sensor is connected with the battery management device and used for acquiring the temperature data of the first battery pack and the second battery pack and feeding the temperature data back to the battery management device.

Preferably, the battery management apparatus is further configured to: upon detection of: and when the temperature data is within a preset temperature range, judging to trigger the termination condition.

Preferably, the system further comprises: one end of the first fuse is connected with the third switch, and the other end of the first fuse is connected with the second battery pack and used for preventing the second battery pack from being short-circuited; the first fuse is also connected with the battery management device and used for feeding back a first failure state to the battery management device; one end of the second fuse is connected with the first switch, and the other end of the second fuse is connected with the first battery pack and used for preventing the first battery pack from being short-circuited; the second fuse is also connected with the battery management device and is used for feeding back a second failure state to the battery management device.

In a second aspect, the present invention provides a battery charging and discharging control method, applied to any one of the systems in the first aspect, including: after the heating signal is received, the second switches are respectively controlled to be closed, and the first switch and the third switch are controlled to be opened, so that the first battery pack and the second battery pack charge the capacitor; after charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack; and after the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until a termination condition is triggered.

In a third aspect, the present invention provides, according to an embodiment of the present invention, a battery charge/discharge control apparatus applied to any one of the systems in the first aspect, the apparatus including: a signal acquisition unit and a control unit; the signal acquisition unit is used for receiving the heating signal and sending the heating signal to the control unit; the control unit is used for controlling the second switch to be closed and controlling the first switch and the third switch to be opened so as to enable the first battery pack and the second battery pack to charge the capacitor; after charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack; and after the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until a termination condition is triggered.

In a fourth aspect, the present invention provides, by an embodiment of the present invention, a power supply apparatus for an electric vehicle, including: first group battery, second group battery, first switch, second switch, third switch, electric capacity and battery management device, wherein, battery management device includes: a memory, a processor and code stored on the memory and executable on the processor, the processor implementing any of the embodiments of the first aspect when executing the code.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

in the embodiment of the invention, after receiving the heating signal, the battery management device respectively controls the second switch to be closed and controls the first switch and the third switch to be opened so as to charge the capacitor by the first battery pack and the second battery pack; after the battery management device judges that the charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack; and after the battery management device judges that the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until the battery management device judges that the triggering termination condition is triggered. Therefore, the temperature of the first battery pack and the temperature of the second battery pack can be increased to a preset temperature range through discharging of the capacitor to the first battery pack and the second battery pack and discharging of the first battery pack and the second battery pack to the capacitor, and the time of a heating process is shortened due to the fact that the inside of the battery pack is directly heated, heat loss is reduced, and the technical effect of improving the heating efficiency is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic diagram of a battery charging/discharging control system according to an embodiment of the present invention;

FIG. 2 is a flow chart of a battery charging/discharging control method according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a battery charge/discharge control device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the battery management device in fig. 1.

Detailed Description

The embodiment of the invention provides a battery charging and discharging control system, method and device, and solves the technical problem of low heating efficiency when a power battery is heated in the related art.

In order to solve the technical problems, the embodiment of the invention provides the following general ideas:

after the battery management device receives the heating signal, the second switches are respectively controlled to be closed, and the first switch and the third switch are controlled to be opened, so that the first battery pack and the second battery pack charge the capacitor; after the battery management device judges that the charging is finished, the first switch and the third switch are respectively controlled to be closed, and the second switch is controlled to be opened, so that the capacitor discharges the first battery pack and the second battery pack; and after the battery management device determines that the discharging is finished, the second switch is controlled to be closed again, and the first switch and the third switch are controlled to be opened so as to charge the capacitor again, so that the circulation is carried out until the battery management device determines that the triggering termination condition is triggered.

Based on this, can make the temperature of first group battery and second group battery rise to the within range of presetting the temperature through the discharge of electric capacity to first group battery and second group battery to and the discharge of electric capacity of first group battery and second group battery, owing to directly heat the group battery inside, and then shortened the time of heating process, and reduced the heat and lost, realized the technological effect who improves heating efficiency.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In a first aspect, the present invention provides a battery charging and discharging control system according to an embodiment of the present invention, which can be applied to a device equipped with multiple battery cells, such as an electric vehicle, and can also be applied to a UPS (uninterruptible Power Supply), and for brevity of description, a description thereof is omitted here.

Referring to fig. 1, the battery charge and discharge control system includes: first battery pack 100, second battery pack 200, first switch 300, second switch 400, third switch 500, capacitor 600, and battery management apparatus 700.

The first battery pack 100, the second battery pack 200, the first switch 300, the second switch 400, the third switch 500 and the capacitor 600 are all connected with the battery management device 700; the second switch 400 may selectively connect the first battery pack 100 with the second battery pack 200; first switch 300 may selectively connect the same poles of first battery pack 100 and second battery pack 200, and third switch 500 may selectively connect the other same poles of first battery pack 100 and second battery pack 200.

Specifically, the second switch 400 may selectively connect the positive electrode of the first battery pack 100 to the negative electrode of the second battery pack 200, or the second switch 400 may selectively connect the negative electrode of the first battery pack 100 to the positive electrode of the second battery pack 200 with respect to the second switch 400.

For the first switch 300 and the third switch 500, specifically, if the first switch 300 can selectively connect the positive electrode of the first battery pack 100 with the positive electrode of the second battery pack 200, the third switch 500 can selectively connect the negative electrode of the first battery pack 100 with the negative electrode of the second battery pack 200; if the first switch 300 selectively connects the cathode of the first battery pack 100 with the cathode of the second battery pack 200, the third switch 500 selectively connects the anode of the first battery pack 100 with the anode of the second battery pack 200.

With respect to capacitor 600, in particular, one terminal of capacitor 600 may be connected to the positive pole of first battery pack 100 and the other terminal may be connected to the negative pole of second battery pack 200, or one terminal of capacitor 600 may be connected to the negative pole of first battery pack 100 and the other terminal may be connected to the positive pole of second battery pack 200.

By using the connection between the first battery pack 100, the second battery pack 200, the first switch 300, the second switch 400, the third switch 500, the capacitor 600 and the battery management device 700, the battery management device 700 controls the second switch 400 to be closed and controls the first switch 300 and the third switch 500 to be opened respectively after receiving the heating signal, so that the first battery pack 100 and the second battery pack 200 charge the capacitor 600.

Specifically, the heating signal may be generated based on a user selection and transmitted to the battery management device 700 by a VCU (Vehicle control unit). Before the battery management apparatus 700 receives the heating signal, the first switch 300, the second switch 400, and the third switch 500 are all in the off state, and the voltage of the capacitor 600 is 0 volt.

In a specific implementation process, after receiving the heating signal, the battery management apparatus 700 controls the second switch 400 to be closed and controls the first switch 300 and the third switch 500 to be opened, at this time, the first battery pack 100 and the second battery pack 200 are connected in series, and the voltage of the capacitor 600 gradually increases from 0 volt to be equal to the voltage of the first battery pack 100 and the second battery pack 200 after being connected in series, so that the first battery pack 100 and the second battery pack 200 charge the capacitor 600.

For example, if the voltage of the first battery pack 100 is V₁The voltage of the second battery pack 200 is V₂When the second switch 400 is closed and the first switch 300 and the third switch 500 are opened, the voltage of the capacitor 600 gradually increases from 0V to V₃In volts, wherein V₃＝V₁+V₂。

After the battery management apparatus 700 determines that the charging is completed, the first switch 300 and the third switch 500 are respectively controlled to be closed, and the second switch 400 is controlled to be opened, so that the capacitor 600 discharges the first battery pack 100 and the second battery pack 200.

Note that the determination of completion of charging by battery management apparatus 700 may include the following conditions 1 to 2:

condition 1: when the second switch 400 is closed and the first switch 300 and the third switch 500 are opened, the timing is started, and when the timing duration is greater than a first preset charging duration, the battery management apparatus 700 determines that the charging is completed.

Condition 2: when it is detected that the voltage of capacitor 600 is equal to the voltage of first battery pack 100 connected in series with second battery pack 200, battery management apparatus 700 determines that charging is complete.

The first preset charging time period may be set according to a difference between a rated voltage of the capacitor 600 and voltages of the first battery pack 100 and the second battery pack 200, and the larger the difference is, the longer the first preset charging time period is.

In a specific implementation process, after determining that charging is completed, the battery management apparatus 700 controls the first switch 300 and the third switch 500 to be closed, and controls the second switch 400 to be opened, at this time, the first battery pack 100 and the second battery pack 200 are connected in parallel, so that the voltage of the capacitor 600 is gradually decreased until the voltage is equal to the voltage after the first battery pack 100 and the second battery pack 200 are connected in parallel, and the capacitor 600 discharges the first battery pack 100 and the second battery pack 200.

For example, if the voltage of the first battery pack 100 is equal to the voltage of the second battery pack 200, i.e., V₁＝V₂When the second switch 400 is turned off and the first switch 300 and the third switch 500 are turned on, the voltage of the capacitor 600 is changed from V₃The voltage is gradually reduced to V₄Volt, at this time, V₄＝V₂/2。

If the voltage of the first battery pack 100 is V₁Internal resistance of R₁The voltage of the second battery pack 200 is V₂Internal resistance of R₂And V is₁＞V₂When the second switch 400 is turned off and the first switch 300 and the third switch 500 are turned on, the voltage of the capacitor 600 is changed from V₃The voltage is gradually reduced to V₄Volt, at this time, V₄＝V₁-R₂×(V₁+V₂)/(R₁+R₂)。

If the voltage of the first battery pack 100 is V₁Internal resistance of R₁The voltage of the second battery pack 200 is V₂Internal resistance of R₂And V is₁＜V₂When the second switch 400 is turned off and the first switch 300 and the third switch 500 are turned on, the voltage of the capacitor 600 is changed from V₃The voltage is gradually reduced to V₄Volt, at this time, V₄＝V₂-R₁×(V₁+V₂)/(R₁+R₂)。

Note that the determination of completion of discharge by battery management apparatus 700 may include the following conditions 3 to 4:

condition 3: when the second switch 400 is turned off and the first switch 300 and the third switch 500 are turned on, the battery management apparatus 700 starts timing, and when the timing period is longer than a preset discharging period, the battery management apparatus determines that the discharging is completed.

Condition 4: when it is detected that the voltage of capacitor 600 is equal to the voltage after first battery pack 100 and second battery pack 200 are connected in parallel, battery management apparatus 700 determines that the discharge is completed.

The preset discharging time period may be set according to a difference between the rated voltage of the capacitor 600 and the voltage of the first battery pack 100 or the voltage of the second battery pack 200, and the larger the difference is, the longer the preset discharging time is.

After the battery management apparatus 700 determines that the discharge is completed, the second switch 400 is controlled to be closed again, and the first switch 300 and the third switch 500 are controlled to be opened to charge the capacitor 600 again, thereby circulating until the battery management apparatus 700 determines that the trigger termination condition is triggered.

Specifically, after the battery management apparatus 700 determines that the discharging is completed, the second switch 400 is controlled to be closed again, and the first switch 300 and the third switch 500 are controlled to be opened, at this time, the first battery pack 100 and the second battery pack 200 are connected in series, and the voltage of the capacitor 600 gradually rises until the voltage is equal to the voltage after the first battery pack 100 and the second battery pack 200 are connected in series, so that the capacitor 600 is charged by the first battery pack 100 and the second battery pack 200, and the capacitor 600 is charged again.

Further, the following steps 1 to 2 are repeatedly executed by the battery management apparatus 700 until the battery management apparatus 700 determines that the termination condition is triggered:

step 1: after the capacitor 600 is determined to be charged, the first switch 300 and the third switch 500 are controlled to be closed, and the second switch 400 is controlled to be opened, so that the capacitor 600 discharges the first battery pack 100 and the second battery pack 200.

Step 2: after the capacitor 600 is determined to be completely discharged, the second switch 400 is controlled to be closed, and the first switch 300 and the third switch 500 are controlled to be opened, so that the first battery pack 100 and the second battery pack 200 charge the capacitor 600.

The termination conditions may include the following conditions 5 to 8:

condition 5: when the battery management apparatus 700 receives the heating signal, timing is started, and when the timing duration is greater than a second preset charging duration, the battery management apparatus 700 determines that the termination condition is triggered.

Condition 6: when detecting that the number of times of turning-off of the first switch 300 reaches a preset threshold, the battery management apparatus 700 determines to trigger a termination condition.

Condition 7: when detecting that the number of times of turning off of the second switch 400 reaches a preset threshold, the battery management apparatus 700 determines to trigger the termination condition.

Condition 8: when detecting that the number of times of turning off the third switch 500 reaches a preset threshold value, the battery management apparatus 700 determines to trigger a termination condition.

The second preset charging time can be set according to the difference between the ambient temperature and the normal working temperature of the battery, and the larger the difference is, the longer the second preset charging time is.

By repeatedly executing the steps 1 to 2, the current is generated inside the first battery pack 100 and the second battery pack 200, and obviously, the current generates heat when passing through the internal resistance of the first battery pack 100 and the internal resistance of the second battery pack 200, so that the inside of the first battery pack 100 and the inside of the second battery pack 200 are heated, the heating process time is shortened, the heat loss is reduced, and the technical effect of improving the heating efficiency is achieved.

In order to more accurately monitor the battery charging and discharging control system and further realize more accurate control, the system can also comprise a voltage sensor.

Specifically, the voltage sensor is connected to the battery management device 700, and is configured to collect actual voltages corresponding to the first battery pack 100, the second battery pack 200, and the capacitor 600, and feed back the actual voltages to the battery management device 700.

In this embodiment, battery management apparatus 700 is configured to determine that charging is complete when it is detected that the actual voltage of first battery pack 100 plus the actual voltage of second battery pack 200 is equal to the actual voltage of capacitor 600.

In a specific implementation, battery management apparatus 700 is further configured to determine that discharging is complete when it is detected that an actual voltage of first battery pack 100 connected in parallel to second battery pack 200 is equal to an actual voltage of capacitor 600.

In order to more accurately monitor the battery charging and discharging control system and further realize more accurate control, the system can also comprise a temperature sensor.

Specifically, the temperature sensor is connected to the battery management device 700, and is configured to collect temperature data of the first battery pack 100 and the second battery pack 200, and feed back the temperature data to the battery management device 700.

In a specific implementation, the battery management apparatus 700 is configured to determine the trigger termination condition when the temperature data is detected to be within the preset temperature range.

The preset temperature range may be set according to the type of the battery, for example, the preset temperature of the ternary lithium battery may be 20 ℃ to 27 ℃, and the preset temperature of the lithium iron phosphate battery may be 25 ℃ to 35 ℃.

In order to prevent the first battery pack 100 and/or the second battery pack 200 from short-circuiting and overloading, referring to fig. 1, a first fuse 800 and a second fuse 900 may be provided in the battery charge and discharge control system.

Specifically, one end of the first fuse 800 is connected to the third switch 500, and the other end of the first fuse 800 is connected to the second battery pack 200, for preventing the second battery pack 200 from short-circuiting; the first fuse 800 is also connected to the battery management apparatus 700 for feeding back the first failure state to the battery management apparatus 700.

One end of the second fuse 900 is connected to the first switch 300, and the other end of the second fuse 900 is connected to the first battery pack 100, for preventing the first battery pack 100 from short-circuiting; the second fuse 900 is also connected to the battery management device 700 for feeding back a second failure state to the battery management device 700.

In addition, in order to further reduce the occurrence of short circuit in the first battery pack 100 and/or the second battery pack 200, please refer to fig. 1, a first current limiting resistor 1000 and a second current limiting resistor 1100 may be further disposed in the battery charging and discharging control system, and the battery management device 700 cannot simultaneously implement the following control logics 1 to 3:

logic 1: the second switch 400 and the first switch 300 are controlled to be closed at the same time.

Logic 2: while controlling the second switch 400 and the third switch 500 to close.

Logic 3: while controlling the first switch 300, the second switch 400, and the third switch 500 to be closed.

It should be noted that the magnitudes of the first current limiting resistor 1000 and the second current limiting resistor 1100 may be determined according to the maximum currents that the first battery pack 100 and the second battery pack 200 can bear, for example, the first current limiting resistor 1000 may be obtained by using the following formula:

R₁＝Vmax/(2×Imax)

wherein R is₁For the first current limiting resistor 1000, Vmax is the highest voltage that the first battery pack 100 can withstand, and Imax is the maximum current that the first battery pack 100 can withstand instantaneously (within about the time constant of the capacitor 6005 RC).

In order to prevent the first current limiting resistor 1000 and/or the second current limiting resistor 1100 from failing, please refer to fig. 1, a main switch 1200 may be further disposed in the battery charging and discharging control system. By controlling the main switch 1200 to be turned off when a short circuit of the first battery pack 100 and/or the second battery pack 200 is detected, a situation that the first battery pack 100 and/or the second battery pack 200 is burnt down is avoided.

It should be noted that the first battery pack 100 may be composed of a plurality of battery cells, and the second battery pack 200 may be composed of a plurality of battery cells; the first switch 300, the second switch 400 and the third switch 500 may be MOS transistors (Metal-Oxide-Semiconductor Field-Effect transistors) to realize high-frequency charging and discharging of the capacitor 600.

Specifically, after battery management apparatus 700 determines the trigger termination condition, first battery pack 100 and second battery pack 200 may be caused to output electric energy to the outside by keeping second switch 400 in the closed state and first switch 300 and third switch 500 in the open state.

In a second aspect, based on the same inventive concept, an embodiment of the present invention provides a battery charging and discharging control method applied to any one of the systems in the first aspect, please refer to fig. 2, where the method includes:

step S201: after receiving the heating signal, the second switch 400 is controlled to be closed, and the first switch 300 and the third switch 500 are controlled to be opened, so that the first battery pack 100 and the second battery pack 200 charge the capacitor 600.

Step S202: after the charging is completed, the first switch 300 and the third switch 500 are respectively controlled to be closed, and the second switch 400 is controlled to be opened, so that the capacitor 600 discharges the first battery pack 100 and the second battery pack 200.

As an alternative embodiment, it is possible to detect: when the actual voltage of the first battery pack 100 plus the actual voltage of the second battery pack 200 is equal to the actual voltage of the capacitor 600, it is determined that charging is complete.

Step S203: after the discharge is completed, the second switch 400 is controlled to be closed again, and the first switch 300 and the third switch 500 are controlled to be opened to charge the capacitor 600 again, so as to cycle until a termination condition is triggered.

As an alternative embodiment, it is possible to detect: when the actual voltage of the first battery pack 100 connected in parallel with the second battery pack 200 is equal to the actual voltage of the capacitor 600, it is determined that the discharge is completed.

As an alternative embodiment, it is possible to detect: and when the temperature data is within a preset temperature range, judging to trigger the termination condition.

In a third aspect, based on the same inventive concept, an embodiment of the present invention provides a battery charging and discharging control apparatus, which is applied to any one of the systems in the first aspect, and as shown in fig. 3, the apparatus includes a signal obtaining unit 301 and a control unit 302.

The signal acquiring unit 301 is configured to receive a heating signal and send the heating signal to the control unit 302;

and a control unit 302, configured to control the second switch 400 to be closed, and control the first switch 300 and the third switch 500 to be opened, so that the first battery pack 100 and the second battery pack 200 charge the capacitor 600.

As an optional implementation manner, the control unit 302 is specifically configured to:

upon detection of: when the actual voltage of the first battery pack 100 connected in parallel with the second battery pack 200 is equal to the actual voltage of the capacitor 600, it is determined that the discharge is completed.

After the charging is completed, the control unit 302 controls the first switch 300 and the third switch 500 to be closed and controls the second switch 400 to be opened, so that the capacitor 600 discharges the first battery pack 100 and the second battery pack 200.

As an optional implementation manner, the control unit 302 is specifically configured to:

upon detection of: when the actual voltage of the first battery pack 100 connected in parallel with the second battery pack 200 is equal to the actual voltage of the capacitor 600, it is determined that the discharge is completed.

And a control unit 302 for controlling the second switch 400 to be closed again and controlling the first switch 300 and the third switch 500 to be opened after the discharging is completed so as to charge the capacitor 600 again, and circulating the process until a termination condition is triggered.

As an optional implementation manner, the control unit 302 is specifically further configured to:

upon detection of: and when the temperature data is within a preset temperature range, judging to trigger the termination condition.

In a fourth aspect, based on the same inventive concept, an embodiment of the present invention provides a power supply apparatus for an electric vehicle, including: first battery pack 100, second battery pack 200, first switch 300, second switch 400, third switch 500, capacitor 600, and battery management apparatus 700.

Referring to fig. 4, the battery management apparatus 700 includes: a memory 401, a processor 402 and code stored on the memory 401 and executable on the processor 402, the processor 402 implementing any of the foregoing battery charge and discharge control systems when executing the code.

Where in fig. 4 a bus architecture (represented by bus 400), bus 400 may include any number of interconnected buses and bridges, bus 400 linking together various circuits including one or more processors, represented by processor 402, and memory, represented by memory 401. The bus 400 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 406 provides an interface between the bus 400 and the receiver 403 and transmitter 404. The receiver 403 and the transmitter 404 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 402 is responsible for managing the bus 400 and general processing, and the memory 401 may be used for storing data used by the processor 402 in performing operations.

The technical scheme in the embodiment of the invention at least has the following technical effects or advantages:

1. according to the battery charge-discharge control method disclosed by the invention, the first battery pack 100 and the second battery pack 200 are discharged through the capacitor 600, and the first battery pack 100 and the second battery pack 200 are discharged through the capacitor 600, so that the temperatures of the first battery pack 100 and the second battery pack 200 are increased to be within the preset temperature range.

2. According to the invention, one or more of the main switch 1200, the first fuse 800, the second fuse 900, the first current limiting resistor and the second current limiting resistor are arranged in the battery charging and discharging control system, so that the situations of short circuit and overload of the first battery pack 100 and/or the second battery pack 200 are reduced, and the protection effect on the first battery pack 100 and/or the second battery pack 200 is realized.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the invention may take the form of a computer product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable code embodied therein.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer instructions. These computer instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.