CN214674407U - Circuit for parallel charging and series discharging - Google Patents
Circuit for parallel charging and series discharging Download PDFInfo
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- CN214674407U CN214674407U CN202120156654.9U CN202120156654U CN214674407U CN 214674407 U CN214674407 U CN 214674407U CN 202120156654 U CN202120156654 U CN 202120156654U CN 214674407 U CN214674407 U CN 214674407U
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Abstract
The utility model discloses a parallelly connected circuit that charges and series discharge, including: a charger; the battery packs are connected with the charger in series in a parallel mode; a load end, which is connected with the plurality of battery packs in series; the plurality of discharge switches are arranged on a circuit formed by connecting the load end and the plurality of battery packs in series, and each discharge switch is arranged corresponding to each battery pack; the charging switches are arranged on a circuit of the charging end connected with the battery packs in parallel, each charging switch is arranged corresponding to each battery pack, when each discharging switch is in a conducting state and each charging switch is in a disconnecting state, the circuit for series discharging is started, and when each discharging switch is in a disconnecting state and each charging switch is in a conducting state, the circuit for parallel charging is started; and a plurality of current control components arranged on a circuit formed by connecting the charger and the plurality of battery packs in parallel, wherein each current control component is arranged corresponding to each battery pack.
Description
Technical Field
The present invention relates to a parallel charging and series discharging circuit, and more particularly to a parallel charging and series discharging circuit.
Background
Referring to fig. 7 and 8, a conventional battery pack 2 'is connected to a charger 1' and a load terminal 3 ', and is controlled by a plurality of switches 51' to charge the battery from the charger or supply power to the load terminal.
When more power needs to be carried, such as when carried in an electric vehicle, more battery packs are required to supply power to the load side. If the series charging is used, the battery pack is influenced by the remaining voltage in each battery pack, and if the remaining voltage in each battery pack is inconsistent, the charging is stopped when the battery pack with the highest voltage is fully charged, so that the remaining battery packs with lower voltages cannot be fully charged. In parallel charging, when the battery pack with the highest voltage is fully charged, the charging is continuously performed, so that the rest battery packs with lower voltages can be continuously fully charged. When the batteries are discharged in series, the batteries are not affected by the voltage in each battery pack, and power is continuously supplied. During parallel discharge, if the voltages in each battery pack are not equal, the situation that the high-voltage battery performs backflow discharge on the low-voltage battery occurs, so that the battery pack is damaged. Therefore, when charging and discharging a plurality of battery packs, parallel charging and series discharging are preferred.
Therefore, it is necessary to provide a parallel charging and series discharging circuit to enable the parallel charging and series discharging of a plurality of batteries.
Disclosure of Invention
An object of the present invention is to provide a parallel charging and series discharging circuit, and more particularly, to a parallel charging and series discharging circuit.
In order to achieve the above object, the present invention discloses a parallel charging and series discharging circuit, which comprises a charger; the battery packs are connected with the charger in series in a parallel mode; the load end is connected with the plurality of battery packs in series; the plurality of discharging switches are arranged on a circuit formed by connecting the load end and the plurality of battery packs in series, and each discharging switch is arranged corresponding to each battery pack; a plurality of charging switches, which are arranged on a circuit formed by connecting the charger and the plurality of battery packs in parallel, wherein each charging switch is arranged corresponding to each battery pack, when each discharging switch is in a conducting state and each charging switch is in a disconnecting state, a series discharging circuit is started, and when each discharging switch is in a disconnecting state and each charging switch is in a conducting state, a parallel charging circuit is started; and the plurality of current control assemblies are arranged on a circuit formed by connecting the charger and the plurality of battery packs in parallel, and each current control assembly is arranged corresponding to each battery pack.
As a further improvement, the plurality of battery packs includes two battery packs, that is, a first battery pack and a second battery pack, the positive electrode of the charger is coupled to a first node, the first node is coupled to a second node and a third node, respectively, the second node is coupled to the positive electrode of the first battery and a fourth node, respectively, the third node is coupled to the positive electrode of the second battery and the positive electrode of the load terminal, respectively, the fourth node is coupled to the negative electrode of the second battery and a fifth node, respectively, the fifth node is coupled to the negative electrode of the charger 1 and a sixth node, respectively, the sixth node is connected to the negative electrode of the first battery and the negative electrode of the load terminal, a discharge switch is coupled between the third node and the positive electrode of the load terminal, and another discharge switch is coupled between the second node and the fourth node, the charging switch is coupled between the first node and the third node, the other charging switch is coupled between the first node and the second node, the current control element is disposed between the fourth node and the fifth node, and the current control element is disposed between the fifth node and the sixth node.
As a further improvement, the current control component is a unidirectional conducting component.
As a further improvement, the current control element is a unidirectional conducting element, the unidirectional conducting element is arranged between the fourth node and the fifth node, the current conducting direction is from the fourth node to the fifth node, the unidirectional conducting element is arranged between the fifth node and the sixth node, and the current conducting direction is from the sixth node to the fifth node.
As a further improvement, the current control element is a control switch, and enters a parallel charging mode when each of the charging switches and each of the control switches are turned on and both of the discharging switches are turned off, and enters a series discharging mode when each of the charging switches and each of the control switches are turned off and both of the discharging switches are turned on.
As a further improvement, the current control element is a control switch, and enters a parallel charging mode when each of the charging switches and each of the control switches are turned on and both of the discharging switches are turned off, and enters a series discharging mode when each of the charging switches and each of the control switches are turned off and both of the discharging switches are turned on.
As mentioned above, the circuit of the present invention for parallel charging and series discharging utilizes the circuit configuration current control component to make the plurality of batteries perform the functions of parallel charging and series discharging.
Drawings
FIG. 1 is a schematic diagram of a parallel charging circuit according to a first embodiment of the parallel charging and series discharging circuit of the present invention.
Fig. 2 is a schematic diagram of a series discharge circuit according to a first embodiment of the parallel charging and series discharging circuit of the present invention.
FIG. 3 is a schematic diagram of a parallel charging circuit according to a second embodiment of the parallel charging and series discharging circuit of the present invention.
FIG. 4 is a schematic diagram of a series discharge circuit according to a second embodiment of the parallel charging and series discharging circuit of the present invention.
FIG. 5 is a schematic diagram of a parallel charging circuit with a plurality of battery packs in a parallel charging and series discharging circuit according to the present invention.
FIG. 6 is a schematic diagram of a series discharging circuit with a plurality of battery packs in a parallel charging and series discharging circuit according to the present invention.
FIG. 7 is a circuit diagram illustrating a single battery charging operation according to the prior art.
FIG. 8 is a circuit diagram illustrating a prior art single battery discharging process.
FIG. 9 is a schematic circuit diagram showing a short circuit in series discharge when two batteries are mounted in the prior art.
Detailed Description
For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference is made to the following detailed description of the embodiments taken in conjunction with the accompanying drawings.
Referring to fig. 1 to 6, the present invention discloses a parallel charging and series discharging circuit 100, wherein the parallel charging and series discharging circuit 100 is disposed in an electric vehicle. The parallel charging and series discharging circuit 100 includes a charger 1, a plurality of battery packs 2, a load terminal 3 and a plurality of current control components.
The charger comprises a plurality of battery packs 2, a plurality of load ends 3 and a plurality of battery packs 2, wherein the battery packs 2 and the charger 1 are connected in series in a parallel mode, the load ends 3 and the battery packs are connected in series in a series mode, the plurality of current control assemblies are arranged on a circuit where the charger 1 and the battery packs are connected in parallel, and each current control assembly is arranged corresponding to each battery pack 2.
The plurality of discharging switches 51 are disposed on a line connecting the load terminal 3 and the plurality of battery packs in series, each discharging switch 51 is disposed corresponding to each battery pack 2, the plurality of charging switches 52 are disposed on a line connecting the charger 1 and the plurality of battery packs in parallel, and each charging switch 52 is disposed corresponding to each battery pack 2. When each discharge switch 51 is turned on and each charge switch 52 is turned off, the series discharging circuit is activated, and when each discharge switch 51 is turned off and each charge switch 52 is turned on, the parallel charging circuit is activated.
Referring to fig. 1 and fig. 2, in the first embodiment of the present invention, a first battery pack 21 and a second battery pack 22 are provided. The current control element is a unidirectional conducting element 6.
The positive pole of the charger 1 is coupled to a first node 41, the first node 41 is coupled to a second node 42 and a third node 43, respectively, and the second node 42 is coupled to the positive pole of the first battery 21 and a fourth node 44, respectively. The third node 43 is coupled to the positive electrode of the second battery 22 and the positive electrode of the load terminal 3, respectively. The fourth node 44 is coupled to the negative terminal of the second battery 22 and a fifth node 45, respectively. The fifth node 45 is coupled to the negative terminal of the charger 1 and a sixth node 46, respectively. The sixth node 46 is connected to the negative terminal of the first battery 21 and the negative terminal of the load terminal 3.
A discharge switch 51 is coupled between the third node 43 and the positive terminal of the load terminal. A further discharge switch 51 is coupled between the second node 42 and the fourth node 44. A charging switch 52 is coupled between the first node 41 and the third node 43. A further charge switch 52 is coupled between the first node 41 and the second node 42. The discharge switch 51 and the charge switch 52 may be manual or electrical switches, or may be MOSFET switches. A unidirectional conducting element 6 is arranged between the fourth node 44 and the fifth node 45, and the current conducting direction is from the fourth node 44 to the fifth node 45. A unidirectional conducting element 6 is arranged between the fifth node 45 and the sixth node 46, and the current conducting direction is from the sixth node 46 to the fifth node 45. The unidirectional conducting element 6 has two electrodes with asymmetric conductance and therefore allows current to flow in only one direction.
Referring to fig. 1, when both the discharging switches 51 are turned off and both the charging switches 52 are turned on, the parallel charging mode is entered. At this time, the current flows from the positive electrode of the charger 1, and a part of the current passes through the first node 41, the charging switch 52, the second node 42, the first battery 21, the sixth node 46, the fifth node 45, and finally returns to the negative electrode of the charger 1. The first battery 21 is thus charged. When the current flows through the first node 41, another part of the current flows through another charging switch 52, the third node 43, the second battery 22, the fourth node 44, the fifth node 45, and finally returns to the negative electrode of the charger 1. The second battery 22 is thus charged. This forms a parallel charging circuit for the first battery 21 and the second battery 22. The first battery 21 and the second battery 22 can receive the current supplied from the charger 1 and are charged in parallel.
Referring to fig. 2, when both of the discharging switches 51 are turned on and both of the charging switches 52 are turned off, the serial discharging mode is entered. At this time, the current flows from the positive electrodes of the first battery 21 and the second battery 22, and the electricity of the first battery 21 flows from the positive electrode, and sequentially passes through the second node 42, the fourth node 44, the negative electrode of the second battery 22, the positive electrode of the second battery 22, the third node 43, the positive electrode of the load terminal 3, the negative electrode of the load terminal 3, the sixth node 46, and the negative electrode of the first battery 21. This forms a series discharge circuit of the first battery 21 and the second battery 22. Due to the characteristics of the unidirectionally conducting element 6, when a current flows from the fourth node 44 to the connected unidirectionally conducting element 6 and the fifth node 45 in sequence, the current is blocked by another unidirectionally conducting element 6 and cannot flow through the other unidirectionally conducting element. Similarly, when current flows from the sixth node 46 to the connected unidirectionally conducting element 6 and the fifth node 45 in sequence, the current is blocked by the other unidirectionally conducting element 6 and cannot flow through the other unidirectionally conducting element. In this way, the first battery 21 and the second battery 22 can supply power to the load terminal 3 in a state of being connected in series.
Referring to fig. 3 and 4, a second embodiment of the present invention is substantially the same as the first embodiment, except that the current control element of the first embodiment is a control switch 53. The control switch 53 may be a manual or electrical switch, or may be a MOSFET switch.
Referring to fig. 3, when the two charging switches 52 and the two control switches 53 are turned on and the two discharging switches 51 are turned off, the parallel charging mode is entered. The current flows in the same manner as the parallel charging mode of the first embodiment.
Referring to fig. 4, when the two charging switches 52 and the two control switches 53 are both turned off and the two discharging switches 51 are both turned on, the serial discharging mode is entered. The current flows in the same manner as the series discharge mode of the first embodiment.
Although the unidirectional conducting device 6 used in the first embodiment does not need additional operation, the unidirectional conducting device 6 generates loss, which is convenient in design or use, but affects the efficiency of parallel charging. The control switch 53 used in the present second embodiment does not generate loss, and therefore does not affect the efficiency of parallel charging. However, the control switch 53 needs to be manually operated or operated by an electrical signal to switch between on and off states, which increases the inconvenience of use or the difficulty of design. Therefore, the two embodiments have both advantages and disadvantages, and can be considered to be used according to the needs of the user.
Referring to fig. 5 and 6, when two or more plural battery packs are mounted, the parallel charging and the series discharging of the plural batteries 2 can be performed according to the same circuit arrangement manner as in the first and second embodiments.
In view of the above, the circuit 100 for parallel charging and series discharging of the present invention carries the unidirectional transmission component 6 or the control switch 53 by circuit configuration, so that the plurality of batteries 2 can perform the functions of parallel charging and series discharging.
Claims (6)
1. A parallel charging and series discharging circuit is characterized in that: comprises a charger; the battery packs are connected with the charger in series in a parallel mode; the load end is connected with the plurality of battery packs in series; the plurality of discharging switches are arranged on a circuit formed by connecting the load end and the plurality of battery packs in series, and each discharging switch is arranged corresponding to each battery pack; a plurality of charging switches, which are arranged on a circuit formed by connecting the charger and the plurality of battery packs in parallel, wherein each charging switch is arranged corresponding to each battery pack, when each discharging switch is in a conducting state and each charging switch is in a disconnecting state, a series discharging circuit is started, and when each discharging switch is in a disconnecting state and each charging switch is in a conducting state, a parallel charging circuit is started; and the plurality of current control assemblies are arranged on a circuit formed by connecting the charger and the plurality of battery packs in parallel, and each current control assembly is arranged corresponding to each battery pack.
2. The parallel charging and series discharging circuit of claim 1, wherein: the plurality of battery packs include two battery packs, that is, a first battery pack and a second battery pack, the positive electrode of the charger is coupled to a first node, the first node is coupled to a second node and a third node, respectively, the second node is coupled to the positive electrode of the first battery and a fourth node, the third node is coupled to the positive electrode of the second battery and the positive electrode of the load terminal, respectively, the fourth node is coupled to the negative electrode of the second battery and a fifth node, respectively, the fifth node is coupled to the negative electrode of the charger and a sixth node, respectively, the sixth node is connected to the negative electrode of the first battery and the negative electrode of the load terminal, a discharge switch is coupled between the third node and the positive electrode of the load terminal, and another discharge switch is coupled between the second node and the fourth node, the charging switch is coupled between the first node and the third node, the other charging switch is coupled between the first node and the second node, the current control element is disposed between the fourth node and the fifth node, and the current control element is disposed between the fifth node and the sixth node.
3. The parallel charging and series discharging circuit of claim 1, wherein: the current control component is a unidirectional conducting component.
4. The parallel charging and series discharging circuit of claim 2, wherein: the current control element is a unidirectional conducting element, the unidirectional conducting element is arranged between the fourth node and the fifth node, the current conducting direction is from the fourth node to the fifth node, the unidirectional conducting element is arranged between the fifth node and the sixth node, and the current conducting direction is from the sixth node to the fifth node.
5. The parallel charging and series discharging circuit of claim 1, wherein: the current control component is a control switch, when each charging switch and each control switch are both turned on and both discharging switches are both turned off, the parallel charging mode is entered, and when each charging switch and each control switch are both turned off and both discharging switches are both turned on, the series discharging mode is entered.
6. The parallel charging and series discharging circuit of claim 2, wherein: the current control component is a control switch, when each charging switch and each control switch are both turned on and both discharging switches are both turned off, the parallel charging mode is entered, and when each charging switch and each control switch are both turned off and both discharging switches are both turned on, the series discharging mode is entered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120156654.9U CN214674407U (en) | 2021-01-20 | 2021-01-20 | Circuit for parallel charging and series discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120156654.9U CN214674407U (en) | 2021-01-20 | 2021-01-20 | Circuit for parallel charging and series discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214674407U true CN214674407U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120156654.9U Active CN214674407U (en) | 2021-01-20 | 2021-01-20 | Circuit for parallel charging and series discharging |
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| Country | Link |
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| CN (1) | CN214674407U (en) |
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2021
- 2021-01-20 CN CN202120156654.9U patent/CN214674407U/en active Active
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