CN215378537U - Battery module voltage balancing device - Google Patents
Battery module voltage balancing device Download PDFInfo
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- CN215378537U CN215378537U CN202121855294.8U CN202121855294U CN215378537U CN 215378537 U CN215378537 U CN 215378537U CN 202121855294 U CN202121855294 U CN 202121855294U CN 215378537 U CN215378537 U CN 215378537U
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Abstract
The disclosure relates to a battery module voltage balancing device. The device includes: the battery pack comprises a tested battery module and a conventional battery module; and the bidirectional isolation direct current conversion unit is connected with the positive and negative electrodes of the battery pack and the positive and negative electrodes of the battery module to be detected and is used for controlling the charging and discharging operations between the battery module to be detected and the conventional battery module according to the voltage comparison result of the voltage of the battery module to be detected and the average voltage of each battery module in the battery pack so as to keep the voltage of each battery module in the battery pack balanced. Like this, need not external power supply, only need be surveyed battery module promptly and be assembled into the battery package with new battery module and just can automated inspection by the voltage of survey battery module and the average voltage of each battery module in the battery package to the voltage of all battery modules reaches balanced state automatically in controlling the battery package according to the voltage comparison result, has effectively reduced the potential safety hazard, need not the artifical charge-discharge of technical staff, labour saving and time saving, the maintenance of the battery of being convenient for.
Description
Technical Field
The disclosure relates to the technical field of batteries, in particular to a battery module voltage balancing device.
Background
With the gradual popularization of electric vehicles, the cruising ability of the electric vehicles is more and more concerned, and in recent years, with the increase of the number of electric vehicles in the market, the maintenance of batteries in the electric vehicles is more and more important.
The battery pack of the electric vehicle is generally formed by connecting a plurality of battery modules in series, wherein the battery modules are assembled by electric cores, and then the battery modules are connected and integrated into a battery pack system. If there is the quality problem in the electric core of certain battery module, then need to change new battery module, after the battery module of renewal, can have pressure differential between each battery module, influence the electric motor car continuation of journey, the event needs to carry out the charge-discharge to the battery module of newly-packing to reach the voltage balance of all battery modules in the battery package.
When balancing battery module voltage at present, need the artifical voltage to battery module in the battery package of technical staff to detect, then charge and discharge the new battery module of installation through external power source to reach the voltage balance of all battery modules in the battery package, this process needs the staff to manually carry out the charge and discharge operation, and is comparatively loaded down with trivial details and have the potential safety hazard, the maintenance of the battery of not being convenient for.
SUMMERY OF THE UTILITY MODEL
The purpose of the present disclosure is to provide a battery module voltage balancing device, which can automatically achieve a balanced state of the voltages of all battery modules in a battery pack by controlling the charging and discharging operations between a tested battery module and a conventional battery module in the battery pack.
In order to achieve the above object, the present disclosure provides a battery module voltage equalizing apparatus, the apparatus including:
the battery pack comprises a tested battery module and a conventional battery module;
and the bidirectional isolation direct current conversion unit is connected with the positive electrode and the negative electrode of the battery pack and the positive electrode and the negative electrode of the battery module to be detected, and is used for controlling the charging and discharging operation between the battery module to be detected and the conventional battery module according to the voltage comparison result of the voltage of the battery module to be detected and the average voltage of each battery module in the battery pack so as to keep the voltage of each battery module in the battery pack balanced.
Optionally, the bidirectional isolated dc conversion unit includes a first inverter driving mechanism and a second inverter driving mechanism;
the first inversion driving mechanism is used for controlling the tested battery module to charge the conventional battery module through the bidirectional isolation direct current conversion unit under the condition that the voltage comparison result represents that the average voltage is smaller than the voltage of the tested battery module;
and the second inversion driving mechanism is used for controlling the conventional battery module to charge the tested battery module through the bidirectional isolation direct current conversion unit under the condition that the voltage comparison result represents that the average voltage is greater than the voltage of the tested battery module.
Optionally, the apparatus further comprises:
the battery pack total voltage acquisition unit is connected with the battery pack and is used for acquiring the total voltage of the battery pack;
and the voltage acquisition unit of the tested battery module is connected with the tested battery module and is used for acquiring the voltage of the tested battery module.
Optionally, the apparatus further comprises:
and the voltage comparison unit is connected with the battery pack total voltage acquisition unit, the battery module voltage acquisition unit to be detected and the bidirectional isolation direct current conversion unit and is used for determining the average voltage of each battery module in the battery pack according to the total voltage of the battery pack, determining the voltage comparison result according to the average voltage and the voltage of the battery module to be detected and sending the voltage comparison result to the bidirectional isolation direct current conversion unit.
Optionally, the total voltage acquisition unit of the battery pack and the voltage acquisition unit of the tested battery module are both voltage sensors.
Optionally, the apparatus further comprises:
the current acquisition unit is connected with the bidirectional isolation direct current conversion unit and used for acquiring loop current in the battery pack and sending the loop current to the bidirectional isolation direct current conversion unit;
the bidirectional isolation direct current conversion unit is further used for determining whether to continue to control the charging and discharging operation between the tested battery module and the conventional battery module according to the loop current when the voltage of the tested battery module is equal to the average voltage after controlling the charging and discharging operation between the tested battery module and the conventional battery module.
Optionally, the bidirectional isolation dc conversion unit is configured to, when the loop current is greater than a preset current threshold, continue to control charging and discharging operations between the battery module to be tested and the conventional battery module after controlling the loop current to decrease to the current threshold until the voltage of the battery module to be tested is equal to the average voltage.
Optionally, the bidirectional isolation dc conversion unit is configured to control the charging and discharging operation between the battery module to be tested and the conventional battery module to stop when the loop current is less than or equal to a preset current threshold.
Optionally, the current collecting unit is a current sensor.
Optionally, the conventional battery module includes one or more battery modules.
Through the technical scheme, the bidirectional isolation direct current conversion unit can control the charging and discharging operation between the tested battery module and the conventional battery module according to the voltage comparison result of the voltage of the tested battery module and the average voltage of each battery module in the battery pack. Like this, need not external power supply, only need be surveyed battery module promptly and be assembled into the battery package with new battery module and just can automated inspection by the voltage of survey battery module and the average voltage of each battery module in the battery package to the voltage of all battery modules reaches balanced state automatically in controlling the battery package according to the voltage comparison result, has effectively reduced the potential safety hazard, need not the artifical charge-discharge of technical staff, labour saving and time saving, the maintenance of the battery of being convenient for.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a battery module voltage equalizing apparatus according to an exemplary embodiment of the present disclosure;
fig. 2 is a block diagram illustrating a battery module voltage equalization apparatus according to another exemplary embodiment of the present disclosure.
Description of the reference numerals
10 battery module voltage balancing device
11 Battery pack
111 conventional battery module of tested battery module 112
12 bidirectional isolation direct current conversion unit
121 first inverter driving mechanism 122 second inverter driving mechanism
13 total voltage acquisition unit of battery package
14 to-be-detected battery module voltage acquisition unit
15 voltage comparison unit
16 current acquisition unit
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a battery module voltage equalizing apparatus according to an exemplary embodiment of the present disclosure. As shown in fig. 1, the apparatus 10 may include a battery pack 11 and a bidirectional isolated dc conversion unit 12.
The battery pack 11 includes a battery module to be tested 111 and a conventional battery module 112.
The conventional battery module 112 may include one or more battery modules, and fig. 1 illustrates the conventional battery module 112 including a plurality of battery modules, which does not limit the embodiments of the disclosure. When a certain battery module in the battery pack is replaced, the newly installed battery module may be used as the battery module 111 to be tested, and the remaining battery modules that are not replaced may be used as the normal battery modules 112.
The bidirectional isolation direct current conversion unit 12 is connected to the positive and negative electrodes of the battery pack 11 and the positive and negative electrodes of the battery module 111 to be tested, and is configured to control charging and discharging operations between the battery module 111 to be tested and the conventional battery module 112 according to a voltage comparison result between the voltage of the battery module 111 to be tested and the average voltage of each battery module in the battery pack 11, so as to keep the voltages of each battery module in the battery pack 11 balanced.
The bidirectional isolation direct current conversion unit 12 is connected with the positive and negative electrodes of the battery pack 11 and the positive and negative electrodes of the battery module to be tested 111 to form a loop for charge movement. When a new battery module, that is, the tested battery module 111, is loaded into the battery pack 11, the bidirectional isolation dc conversion unit 12 may control the charging and discharging operations between the tested battery module 111 and the conventional battery module 112 according to the comparison result between the voltage of the tested battery module 111 and the average voltage of each battery module in the battery pack 11, after the charging and discharging operations are performed for a period of time, the voltage of the tested battery module 111 may be equal to the average voltage of each battery module in the battery pack 11, and at this time, the voltages of all the battery modules in the battery pack 11 may reach an equilibrium state.
Through the technical scheme, the bidirectional isolation direct current conversion unit can control the charging and discharging operation between the tested battery module and the conventional battery module according to the voltage comparison result of the voltage of the tested battery module and the average voltage of each battery module in the battery pack. Like this, need not external power supply, only need be surveyed battery module promptly and be assembled into the battery package with new battery module and just can automated inspection by the voltage of survey battery module and the average voltage of each battery module in the battery package to the voltage of all battery modules reaches balanced state automatically in controlling the battery package according to the voltage comparison result, has effectively reduced the potential safety hazard, need not the artifical charge-discharge of technical staff, labour saving and time saving, the maintenance of the battery of being convenient for.
Fig. 2 is a schematic diagram of a battery module voltage equalization apparatus shown in another exemplary embodiment of the present disclosure. As shown in fig. 2, the device 10 may further include a battery pack total voltage acquisition unit 13, a battery module voltage acquisition unit 14 to be tested, a voltage comparison unit 15, and a current acquisition unit 16, in addition to the battery pack 11 and the bidirectional isolated dc conversion unit 12.
The battery pack 11 includes a battery module to be tested 111 and a conventional battery module 112.
The bidirectional isolation direct current conversion unit 12 is connected to the positive and negative electrodes of the battery pack 11 and the positive and negative electrodes of the battery module 111 to be tested, and is configured to control charging and discharging operations between the battery module 111 to be tested and the conventional battery module 112 according to a voltage comparison result between the voltage of the battery module 111 to be tested and the average voltage of each battery module in the battery pack 11, so as to keep the voltages of each battery module in the battery pack 11 balanced.
As shown in fig. 2, the bidirectional isolated dc conversion unit 12 may include a first inverter driving mechanism 121 and a second inverter driving mechanism 122.
The first inverter driving mechanism 121 is configured to control the tested battery module 111 to charge the conventional battery module 112 through the bidirectional isolation dc conversion unit 12 when the voltage comparison result indicates that the average voltage is less than the voltage of the tested battery module;
and the second inverter driving mechanism 122 is configured to control the conventional battery module 112 to charge the tested battery module 111 through the bidirectional isolated dc conversion unit 12 under the condition that the voltage comparison result indicates that the average voltage is greater than the voltage of the tested battery module.
The main circuit element in the bidirectional isolation dc conversion unit 12 is a transformer, and the voltage is changed by using the principle of electromagnetic induction. The bidirectional isolation dc conversion unit 12 includes a first inversion driving mechanism 121 and a second inversion driving mechanism 122, and the two inversion driving mechanisms can prevent the battery module voltage balancing device from charging and discharging simultaneously.
If the average voltage of each battery module in the battery pack 11 is smaller than the voltage of the battery module 111 to be tested, it can be characterized that the voltage of the newly-installed battery module, that is, the voltage of the battery module 111 to be tested, is larger than the voltage of the conventional battery module 112, in order to equalize the voltages of all the battery modules in the battery pack 11, the first inverter driving mechanism 121 in the bidirectional isolation dc conversion unit 12 can control the battery module 111 to be tested to charge the conventional battery module 112, and the current direction of the charging process is shown as the current direction 1 in fig. 2.
If the average voltage of each battery module in the battery pack 11 is greater than the voltage of the battery module 111 to be tested, it can be characterized that the voltage of the newly-installed battery module, that is, the voltage of the battery module 111 to be tested, is less than the voltage of the conventional battery module 112, in order to equalize the voltages of all the battery modules in the battery pack 11, the second inverter driving mechanism 122 in the bidirectional isolation dc conversion unit 12 can control the conventional battery module 112 to charge the battery module 111 to be tested, and the current direction of the charging process is shown as the current direction 2 in fig. 2.
The battery pack total voltage acquisition unit 13 is connected with the battery pack 11 and is used for acquiring the total voltage of the battery pack;
the voltage acquisition unit 14 of the tested battery module is connected to the tested battery module 111 and is used for acquiring the voltage of the tested battery module 111.
The battery pack total voltage acquisition unit 13 and the detected battery module voltage acquisition unit 14 can be voltage sensors. A voltage sensor is a sensor that senses the measured voltage and converts it into a usable output signal. Illustratively, the voltage sensor may be a voltage transformer, a hall voltage sensor, a fiber optic voltage sensor, or other kinds of voltage sensors, which are not limited by the present disclosure.
And the voltage comparison unit 15 is connected with the battery pack total voltage acquisition unit 13, the battery module voltage acquisition unit 14 to be tested and the bidirectional isolation direct current conversion unit 12, and is used for determining the average voltage of each battery module in the battery pack 11 according to the total voltage of the battery pack, determining a voltage comparison result according to the average voltage and the voltage of the battery module 111 to be tested, and sending the voltage comparison result to the bidirectional isolation direct current conversion unit 12.
Illustratively, the battery pack 11 is composed of a plurality of battery modules connected in series, and the voltage comparison unit 15 determines the average voltage of each battery module in the battery pack 11 according to the ratio of the total voltage of the battery pack to the total number of battery modules in the battery pack. Then, the voltage comparing unit 15 may obtain a voltage comparison result according to the average voltage and the voltage of the battery module 111 to be tested, and send the comparison result to the bidirectional isolated dc converting unit 12.
If the voltage comparison result represents that the average voltage is smaller than the voltage of the tested battery module 111, the voltage comparison unit 15 may send a first inversion driving mechanism starting instruction to the bidirectional isolation direct current conversion unit 12, and the bidirectional isolation direct current conversion unit 12 controls the first inversion driving mechanism 121 to work in response to the first inversion driving mechanism starting instruction, so that the tested battery module 111 charges the conventional battery module 112.
If the voltage comparison result represents that the average voltage is greater than the voltage of the battery module to be tested 111, the voltage comparison unit 15 may send a second inversion driving mechanism starting instruction to the bidirectional isolation direct current conversion unit 12, and the bidirectional isolation direct current conversion unit 12 controls the first inversion driving mechanism 121 to work in response to the second inversion driving mechanism starting instruction, so that the conventional battery module 112 charges the battery module to be tested 111.
The current acquisition unit 16 is connected with the bidirectional isolation direct current conversion unit 12 and used for acquiring loop current in the battery pack and sending the loop current to the bidirectional isolation direct current conversion unit 12;
the bidirectional isolation dc conversion unit 12 is further configured to determine whether to continue to control the charging and discharging operations between the tested battery module 111 and the normal battery module 112 according to the loop current when the voltage of the tested battery module 111 is equal to the average voltage after controlling the charging and discharging operations between the tested battery module 111 and the normal battery module 112.
In the process of charging and discharging the battery, a polarization phenomenon is usually generated, and the polarization phenomenon exists in common batteries such as lead-acid batteries, lithium batteries and nickel-hydrogen batteries. An equilibrium state is a state of rest, relatively ideal, when no current is flowing. The polarization of the cell is a phenomenon that the actual electrode potential deviates from the equilibrium electrode potential after the static state is broken due to the flow of current.
In order to ensure the high-efficiency operation of the battery module voltage balancing device, the current generated in the battery charging and discharging process is large (such as 6A), in this state, when the voltage of the battery module 111 to be tested is equal to the average voltage of each battery module in the battery pack 11, if the charging and discharging are stopped immediately, the voltage of the battery module will change due to the polarization phenomenon, and the potential difference is generated again, at this time, the battery modules in the battery pack 11 do not reach the real voltage balance. In order to avoid the influence caused by the polarization phenomenon, the bidirectional isolation dc conversion unit 12 may determine whether to continue to control the charging and discharging operations between the tested battery module 111 and the normal battery module 112 according to the magnitude of the loop current in the battery pack collected by the current collection unit 16.
The bidirectional isolation direct current conversion unit 12 is configured to, when the loop current is greater than the preset current threshold, continue to control the charging and discharging operations between the measured battery module 111 and the conventional battery module 112 after the loop current is controlled to be reduced to the current threshold until the voltage of the measured battery module 111 is equal to the average voltage.
For example, the current threshold may be preset, for example, to be 3A, if the voltage of the battery module 111 to be tested is equal to the average voltage, for example, the loop current is 6A at this time, the bidirectional isolation dc conversion unit 12 may control the loop current to decrease to 3A, and according to the current voltage comparison result, continue to control the charging and discharging operations between the battery module 111 to be tested and the conventional battery module 112 until the voltage of the battery module 111 to be tested is equal to the average voltage, and the loop current is smaller when the voltage is balanced again, so that the influence caused by the battery polarization phenomenon can be effectively reduced.
The bidirectional isolation dc conversion unit 12 is configured to control the charging and discharging operations between the tested battery module 111 and the normal battery module 112 to stop when the loop current is less than or equal to the preset current threshold.
Under the condition that the loop current is less than or equal to the preset current threshold, the current is small enough, the polarization phenomenon has little influence on the voltage balance of the battery module, and at the moment, the battery module in the battery pack 11 reaches the real voltage balance, so that the charging and discharging operations between the tested battery module 111 and the conventional battery module 112 can be controlled to stop, namely, the voltage balance process of the battery module is completed, and the loss of electric energy is avoided.
The current collection unit 16 may be a current sensor.
The current sensor may be, for example, a shunt, an electromagnetic current transformer, an electronic current transformer, or another type of current sensor, which is not limited in this disclosure.
Through the technical scheme, an external power supply is not needed, only the new battery module, namely the battery module to be tested, is assembled into the battery pack, the voltage of the battery module to be tested and the average voltage of each battery module in the battery pack can be automatically detected, the voltages of all the battery modules in the battery pack are controlled to automatically reach the balanced state according to the voltage comparison result, and the influence of the polarization phenomenon on the battery module is effectively reduced under the condition that the charging and discharging work efficiency of the battery module voltage balancing device is ensured.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A battery module voltage equalization device, characterized in that the device includes:
the battery pack comprises a tested battery module and a conventional battery module;
and the bidirectional isolation direct current conversion unit is connected with the positive electrode and the negative electrode of the battery pack and the positive electrode and the negative electrode of the battery module to be detected, and is used for controlling the charging and discharging operation between the battery module to be detected and the conventional battery module according to the voltage comparison result of the voltage of the battery module to be detected and the average voltage of each battery module in the battery pack so as to keep the voltage of each battery module in the battery pack balanced.
2. The battery module voltage equalizing device of claim 1, wherein the bidirectional isolated dc conversion unit comprises a first inverter driving mechanism and a second inverter driving mechanism;
the first inversion driving mechanism is used for controlling the tested battery module to charge the conventional battery module through the bidirectional isolation direct current conversion unit under the condition that the voltage comparison result represents that the average voltage is smaller than the voltage of the tested battery module;
and the second inversion driving mechanism is used for controlling the conventional battery module to charge the tested battery module through the bidirectional isolation direct current conversion unit under the condition that the voltage comparison result represents that the average voltage is greater than the voltage of the tested battery module.
3. The battery module voltage equalization apparatus according to claim 1, further comprising:
the battery pack total voltage acquisition unit is connected with the battery pack and is used for acquiring the total voltage of the battery pack;
and the voltage acquisition unit of the tested battery module is connected with the tested battery module and is used for acquiring the voltage of the tested battery module.
4. The battery module voltage equalizing device according to claim 3, wherein the device further comprises:
and the voltage comparison unit is connected with the battery pack total voltage acquisition unit, the battery module voltage acquisition unit to be detected and the bidirectional isolation direct current conversion unit and is used for determining the average voltage of each battery module in the battery pack according to the total voltage of the battery pack, determining the voltage comparison result according to the average voltage and the voltage of the battery module to be detected and sending the voltage comparison result to the bidirectional isolation direct current conversion unit.
5. The battery module voltage equalizing device according to claim 3, wherein the battery pack total voltage collecting unit and the battery module voltage collecting unit to be tested are both voltage sensors.
6. The battery module voltage equalization apparatus according to claim 1, further comprising:
the current acquisition unit is connected with the bidirectional isolation direct current conversion unit and used for acquiring loop current in the battery pack and sending the loop current to the bidirectional isolation direct current conversion unit;
the bidirectional isolation direct current conversion unit is further used for determining whether to continue to control the charging and discharging operation between the tested battery module and the conventional battery module according to the loop current when the voltage of the tested battery module is equal to the average voltage after controlling the charging and discharging operation between the tested battery module and the conventional battery module.
7. The battery module voltage equalizing device according to claim 6,
the bidirectional isolation direct current conversion unit is used for continuously controlling the charging and discharging operation between the battery module to be tested and the conventional battery module until the voltage of the battery module to be tested is equal to the average voltage after controlling the loop current to be reduced to the current threshold value under the condition that the loop current is larger than the preset current threshold value.
8. The battery module voltage equalizing device according to claim 6,
and the bidirectional isolation direct current conversion unit is used for controlling the charging and discharging operation between the tested battery module and the conventional battery module to be stopped under the condition that the loop current is less than or equal to a preset current threshold value.
9. The battery module voltage equalizing device according to claim 6, wherein the current collecting unit is a current sensor.
10. The battery module voltage equalizing device according to any one of claims 1 to 9, wherein the conventional battery module comprises one or more battery modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121855294.8U CN215378537U (en) | 2021-08-09 | 2021-08-09 | Battery module voltage balancing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121855294.8U CN215378537U (en) | 2021-08-09 | 2021-08-09 | Battery module voltage balancing device |
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| CN215378537U true CN215378537U (en) | 2021-12-31 |
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| CN202121855294.8U Active CN215378537U (en) | 2021-08-09 | 2021-08-09 | Battery module voltage balancing device |
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- 2021-08-09 CN CN202121855294.8U patent/CN215378537U/en active Active
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