CN220368495U - Multi-battery pack parallel control circuit - Google Patents
Multi-battery pack parallel control circuit Download PDFInfo
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- CN220368495U CN220368495U CN202321740720.2U CN202321740720U CN220368495U CN 220368495 U CN220368495 U CN 220368495U CN 202321740720 U CN202321740720 U CN 202321740720U CN 220368495 U CN220368495 U CN 220368495U
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- 238000007599 discharging Methods 0.000 claims description 24
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model provides a multi-battery pack parallel control circuit, which comprises: a first battery pack and at least one second battery pack; the first battery pack includes: the battery comprises a first battery module, a first control module and a pre-charging module; the first control module is electrically connected with the pre-charging module; the first control module is electrically connected with the first battery module; the pre-charging module is electrically connected with the first battery module; the second battery pack includes: a second battery module and a second control module; the second control module is electrically connected with the second battery module; the first battery pack and the second battery pack are connected in parallel. According to the utility model, when any battery pack in the multi-battery packs is abnormal, the abnormal battery pack is disconnected through the control module, the use of the whole battery pack system is not affected, and meanwhile, any battery pack is charged and discharged through the control module, so that the problem that all battery packs in the prior art can only be charged and discharged simultaneously is solved.
Description
Technical Field
The utility model relates to the field of battery systems, in particular to a multi-battery pack parallel control circuit.
Background
With the rapid rise of renewable energy sources such as wind energy and solar energy and smart grid industry, lithium ion batteries are beginning to be greatly developed. The battery pack formed by the lithium ion battery can play a key role in storing energy. The battery packs are connected in parallel and in series, when a high-capacity battery system is needed, the mode of connecting the battery packs in parallel is selected, when one or more battery packs fail, the whole battery system cannot be used in the prior art, all the battery packs can only be charged or discharged simultaneously, one or more battery packs cannot be charged or discharged simultaneously, when a certain part of the battery packs have problems, the battery system cannot work continuously, and the fault tolerance is low.
Disclosure of Invention
In view of the above, the present utility model aims to overcome the defects in the prior art, and provide a parallel control circuit for battery packs.
The utility model provides the following technical scheme:
the embodiment of the application provides a multi-battery pack parallel control circuit, which comprises: a first battery pack and at least one second battery pack;
the first battery pack includes: the battery comprises a first battery module, a first control module and a pre-charging module; the first control module is electrically connected with the pre-charging module;
the first control module is electrically connected with the first battery module;
the pre-charging module is electrically connected with the first battery module;
the second battery pack includes: a second battery module and a second control module; the second control module is electrically connected with the second battery module;
the first battery pack and the second battery pack are connected in parallel.
In an embodiment, the number of the second battery packs is N, and the ith second battery pack is connected in parallel with the (i+1) th second battery pack, where i is greater than or equal to 1 and N is greater than or equal to N.
In one embodiment, the first battery pack further includes: a first battery pack positive electrode and a first battery pack negative electrode; the second battery pack further includes: a second battery pack positive electrode and a second battery pack negative electrode;
the first battery pack is electrically connected with the second battery pack through the first battery pack positive electrode and the second battery pack positive electrode;
the first battery pack is electrically connected with the second battery pack through the first battery pack negative electrode and the second battery pack negative electrode.
In one embodiment, the first battery pack positive electrode includes: a first positive electrode and a second positive electrode; the first battery pack anode includes: a first negative electrode and a second negative electrode;
the first positive electrode of the first battery pack is connected with the total positive electrode of the battery pack;
the first negative electrode of the first battery pack is connected with the total negative of the battery pack.
In one embodiment, the second battery pack positive electrode includes: a third positive electrode and a fourth positive electrode; the second battery pack anode includes: a third anode and a fourth anode;
the third positive electrode of the second battery pack is electrically connected with the second positive electrode of the first battery pack;
the third negative electrode of the second battery pack is electrically connected to the second negative electrode of the first battery pack.
In an embodiment, the positive output end of the first battery module is electrically connected with one end of the pre-charging module;
one end of the first control module is electrically connected with one end of the pre-charging module;
the other end of the first control module is electrically connected with the other end of the pre-charging module;
and the positive output end of the second battery module is electrically connected with one end of the second control module.
In one embodiment, the priming module includes: the input end of the pre-charging resistor is connected with one end of the pre-charging relay in series.
In one embodiment, the first control module includes: a first charging relay, a first discharging relay, and a first common cathode diode;
a first anode of the first common cathode diode is electrically connected with one end of the first charging relay;
the common cathode of the first common cathode diode is respectively and electrically connected with the other end of the first charging relay and one end of the first discharging relay;
the second anode of the first common cathode diode is electrically connected with the other end of the first discharge relay; the other end of the first charging relay is electrically connected with one end of the first discharging relay.
In one embodiment, the second control module includes: the second charging relay, the second discharging relay and the second common cathode diode;
the first anode of the second common cathode diode is electrically connected with one end of the second charging relay;
the common cathode of the second common cathode diode is respectively and electrically connected with the other end of the second charging relay and one end of the second discharging relay;
the second anode of the second common cathode diode is electrically connected with the other end of the second discharge relay;
the other end of the second charging relay is electrically connected with one end of the second discharging relay.
In one embodiment, the battery pack is a lithium battery.
Embodiments of the present utility model have the following advantages:
the multi-battery pack parallel circuit provided by the application can disconnect a fault battery pack when any battery pack fails by adding the control module to the output end of each battery pack, and the use of the whole battery pack parallel system is not affected. Meanwhile, any battery pack can be charged and discharged through the control module. The battery pack system solves the problems that in the prior art, a plurality of battery packs cannot be charged and discharged simultaneously, and when one or more battery packs fail in the prior art, the whole battery pack system cannot be used. The circuit is simple and clear, has strong practicability and can be widely applied.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a multi-battery pack parallel control circuit according to an embodiment of the present application.
Fig. 2 shows a schematic diagram of a first battery pack structure of the multi-battery pack parallel control circuit.
Fig. 3 shows a second battery pack structure schematic of the multi-battery pack parallel control circuit.
Description of main reference numerals:
10-a first battery pack; 11-a first battery module; 12-a first control module; 122-a first common-cathode diode; 121-a first charging relay; 123-a first discharge relay; 13-a priming module; 131-pre-charging the resistor; 132-precharge relay; 20-a second battery pack; 21-a second battery module; 22-a second control module; 221-a second charging relay; 222-a second common-cathode diode; 223-a second discharge relay; 30-battery pack total positive; 40-total negative of battery pack; 14-a first battery pack positive electrode; 15-a first battery pack anode; 23-a second battery pack positive electrode; 24-a second battery pack anode; 141-a first positive electrode; 142-a second positive electrode; 151-a first negative electrode; 152-a second negative electrode; 231-a third positive electrode; 232-a fourth positive electrode; 241-a third negative electrode; 242-fourth negative electrode.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
The embodiment of the application provides a multi-battery pack parallel control circuit, in the prior art, a plurality of battery packs form a battery pack system through parallel connection, when one or more battery packs fail, the whole battery pack system cannot be used, and all battery packs can only be charged or discharged at the same time, so that one or more battery packs cannot be charged or discharged. The multi-battery pack parallel control circuit can effectively solve the problems.
Referring to fig. 1, the multi-battery pack parallel control circuit includes: a first battery pack 10 and at least one second battery pack 20, the first battery pack 10 comprising: a first battery module, a first control module 12, and a pre-charge module 13; the first control module 12 is electrically connected with the pre-charging module 13; the first control module 12 is electrically connected with the first battery module 11; the pre-charging module 13 is electrically connected with the first battery module 11; the second battery pack 20 includes: a second battery module 21 and a second control module 22; the second control module 22 is electrically connected with the second battery module 21; the first battery pack 10 and the second battery pack 20 are connected in parallel.
It should be noted that, when the first battery pack 10 and at least one of the second battery packs 20 are connected in parallel, which corresponds to that n battery packs are connected in parallel, the following situations may occur when n battery packs are connected in parallel:
(1) When the total voltage difference between the n battery packs is smaller than the voltage set threshold value 5V, no pre-charging is needed. First, the first charge relay 121 and the first discharge relay 123 of the first battery pack 10 are closed, the second charge relay 221 and the second discharge relay 223 of the second battery pack 20 are closed again, the nth charge relay and the nth discharge relay of the remaining battery packs are sequentially closed, and after the charge relay and the nth discharge relay of the nth battery pack are closed, the n battery packs are connected in parallel.
(2) When a partial pressure difference among the total pressure differences of the n battery packs is greater than 5V and less than 10V, the pre-charge is required. First, the first pre-charge relay 132 of the first battery pack 10 is closed, then the charge relay and the second discharge relay 223 of the second battery pack 20 are closed, when the total voltage difference between the second battery pack 20 and the first battery pack 10 is smaller than a set threshold value 2V, the third charge relay and the third discharge relay of the third battery pack are closed, when the total voltage difference between the third battery pack and the first battery pack 10 is smaller than the set threshold value 2V, the fourth charge relay and the fourth discharge relay of the fourth battery pack are closed, and so on, when the total voltage difference between the nth battery pack and the first battery pack 10 is smaller than the set threshold value 2V, the first charge relay 121 and the first discharge relay 123 of the first battery pack 10 are closed, the first pre-charge relay 132 of the first battery pack 10 is opened, and the n battery packs are connected in parallel.
(3) When partial pressure difference in total pressure difference among n battery packs is larger than 10V, no pre-charging is performed, the fault of the battery system is judged, meanwhile, the fault is reported, all the battery pack charging relays and discharging relays are not closed, and maintenance is waited.
It should be further noted that, when the first battery pack 10 and the second battery pack 20 are connected in parallel, which is equivalent to that n battery packs are connected in parallel, the following situations may occur after the n battery packs are connected in parallel:
(1) In the charging process, when the highest single voltage in the battery pack is more than 3.65V, the nth charging relay of the nth battery pack is disconnected, the electric loop where the nth charging relay is positioned is not connected based on the characteristics of the common cathode diode, the electric loop where the nth discharging relay is positioned is connected, at the moment, the nth battery pack can only be discharged, but cannot be charged, other battery packs can be continuously charged and are not influenced until the highest single voltage of all battery packs is more than 3.65V, and the battery system is judged to be in a full-charge state. When the highest single voltage in the nth battery pack is less than 3.5V, the nth charging relay of the nth battery pack is closed again, and based on the characteristics of the common cathode diode, the electric loop where the nth charging relay is positioned is conducted, and the electric loop where the nth discharging relay is positioned is conducted, so that the charging and discharging can be performed at the moment.
(2) In the discharging process, when the lowest single voltage in the nth battery pack is less than 2.5V, the nth discharging relay of the nth battery pack is disconnected, the electric loop where the nth discharging relay is positioned is not communicated based on the characteristics of the common cathode diode, the electric loop where the nth charging relay is positioned is communicated, at the moment, the nth battery pack can only be charged, but can not be discharged, the rest battery packs can be continuously discharged without being influenced until the lowest single voltage of all battery packs is less than 2.5V, and the battery system is judged to be in an empty state. When the lowest single voltage in the nth battery pack is more than 2.9V, the nth discharge relay of the nth battery pack is closed again, and based on the characteristics of the common cathode diode, the electric loop where the nth charge relay is positioned is conducted, and the electric loop where the nth discharge relay is positioned is conducted, so that the electric charging and discharging can be performed at the moment, and the electric charging can be performed at the moment.
(3) When one or more battery packs fail during charging or discharging, the failure comprises single battery pack failures such as abnormal voltage of the single battery pack, abnormal temperature of the single battery pack, over-high temperature of the single battery pack, over-low temperature of the single battery pack, over-high voltage of the single battery pack, over-low voltage of the single battery pack, abnormal jump of total voltage of the battery pack and the like. The nth charging relay and the nth discharging relay of the corresponding battery packs are disconnected, meanwhile, the fault is reported, the battery packs which are faulty at the moment cannot be charged and discharged, and the other battery packs can be charged or discharged normally without being influenced.
In this embodiment, the set threshold values are all temporary values, and can be adjusted according to actual situations.
In one embodiment, the number of the second battery packs 20 is N, and the ith second battery pack 20 is connected in parallel with the (i+1) th second battery pack 20, where i is equal to or greater than 1 and N is equal to or less than N.
It should be noted that, the i-th battery pack and the i+1-th battery pack are in a sequential parallel relationship.
In one embodiment, the first battery pack 10 further includes: a first battery pack positive electrode 14 and a first battery pack negative electrode 15; the second battery pack 20 further includes: a second battery pack positive electrode 23 and a second battery pack negative electrode 24; the first battery pack 10 is electrically connected to the second battery pack 20 through the first battery pack positive electrode 14 and the second battery pack positive electrode 23; the first battery pack 10 is electrically connected to the second battery pack 20 through the first battery pack negative electrode 15 and the second battery pack negative electrode 24.
In one embodiment, the first battery pack positive electrode 14 includes: a first positive electrode 141 and a second positive electrode 142; the first battery pack anode 15 includes: a first negative electrode 151 and a second negative electrode 152; the first positive electrode 141 of the first battery pack 10 is connected to a battery pack total positive electrode 30; the first negative electrode 151 of the first battery pack 10 is connected to the battery pack total negative electrode 40.
The battery pack total positive 30 and the battery pack total negative 40 are electric equipment or power supply.
In one embodiment, the second battery pack positive electrode 23 includes: a third positive electrode 231 and a fourth positive electrode 232; the second battery pack anode 24 includes: a third negative electrode 241 and a fourth negative electrode 242; the third positive electrode 231 of the second battery pack 20 is electrically connected to the second positive electrode 142 of the first battery pack 10; the third negative electrode 241 of the second battery pack 20 is electrically connected to the second negative electrode 152 of the first battery pack 10.
In an embodiment, the positive output end of the first battery module is electrically connected to one end of the pre-charging module 13; one end of the first control module 12 is electrically connected with one end of the pre-charging module 13; the other end of the first control module 12 is electrically connected with the other end of the pre-charging module 13; the positive output end of the second battery module 21 is electrically connected to one end of the second control module 22.
In one embodiment, the pre-charging module 13 includes: a precharge resistor 131 and a precharge relay 132, wherein an input end of the precharge resistor 131 is connected in series with one end of the precharge relay 132.
When the battery packs are connected in parallel, the pre-charging module 13 may perform pre-charging, reduce the total voltage difference between the battery packs, reduce the current during the parallel connection, and protect the battery system from damage.
In one embodiment, as shown in fig. 2, the first control module 12 includes: a first charging relay 121, a first discharging relay 123, and a first common cathode diode 122; a first anode of the first common cathode diode 122 is electrically connected to one end of the first charging relay 121; the common cathode of the first common cathode diode 122 is electrically connected to the other end of the first charging relay 121 and one end of the first discharging relay 123, respectively; a second anode of the first common cathode diode 122 is electrically connected to the other end of the first discharge relay 123; the other end of the first charge relay 121 is electrically connected to one end of the first discharge relay 123.
In this embodiment, the common-cathode diode is an anti-reverse common-cathode diode, which can prevent the circulation caused by the voltage difference between circuits, and can be used as a disconnection point to isolate the system when the device is in fault, thereby facilitating further maintenance.
In one embodiment, as shown in fig. 3, the second control module 22 includes: a second charge relay 221, a second discharge relay 223, and a second common cathode diode 222; a first anode of the second common cathode diode 222 is electrically connected to one end of the second charging relay 221; the common cathode of the second common cathode diode 222 is electrically connected to the other end of the second charge relay 221 and one end of the second discharge relay 223, respectively; a second anode of the second common cathode diode 222 is electrically connected to the other end of the second discharge relay 223; the other end of the second charge relay 221 is electrically connected to one end of the second discharge relay 223.
In one embodiment, the battery pack is a lithium battery.
According to the multi-battery pack parallel circuit provided by the embodiment, the control module is added at the output end of each battery pack, so that when any battery pack fails, the failed battery pack can be disconnected, and the use of the whole battery pack parallel system is not affected. Meanwhile, any battery pack can be charged and discharged through the control module. The battery pack system solves the problems that in the prior art, a plurality of battery packs cannot be charged and discharged simultaneously, and when one or more battery packs fail in the prior art, the whole battery pack system cannot be used. The circuit is simple and clear, has strong practicability and can be widely applied.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (10)
1. A multi-battery pack parallel control circuit, comprising: a first battery pack and at least one second battery pack;
the first battery pack includes: the battery comprises a first battery module, a first control module and a pre-charging module; the first control module is electrically connected with the pre-charging module;
the first control module is electrically connected with the first battery module;
the pre-charging module is electrically connected with the first battery module;
the second battery pack includes: a second battery module and a second control module; the second control module is electrically connected with the second battery module;
the first battery pack and the second battery pack are connected in parallel.
2. The multi-cell pack parallel control circuit according to claim 1, wherein the number of the second cell packs is N, and an i-th one of the second cell packs is connected in parallel with an i+1-th one of the second cell packs, 1.ltoreq.i.ltoreq.n.
3. The multi-battery pack parallel control circuit of claim 1, wherein the first battery pack further comprises: a first battery pack positive electrode and a first battery pack negative electrode; the second battery pack further includes: a second battery pack positive electrode and a second battery pack negative electrode;
the first battery pack is electrically connected with the second battery pack through the first battery pack positive electrode and the second battery pack positive electrode;
the first battery pack is electrically connected with the second battery pack through the first battery pack negative electrode and the second battery pack negative electrode.
4. The multi-pack parallel control circuit of claim 3, wherein the first pack positive electrode comprises: a first positive electrode and a second positive electrode; the first battery pack anode includes: a first negative electrode and a second negative electrode;
the first positive electrode of the first battery pack is connected with the total positive electrode of the battery pack;
the first negative electrode of the first battery pack is connected with the total negative of the battery pack.
5. The multi-cell pack parallel control circuit of claim 4, wherein the second pack positive electrode comprises: a third positive electrode and a fourth positive electrode; the second battery pack anode includes: a third anode and a fourth anode;
the third positive electrode of the second battery pack is electrically connected with the second positive electrode of the first battery pack;
the third negative electrode of the second battery pack is electrically connected to the second negative electrode of the first battery pack.
6. The multi-battery pack parallel control circuit of claim 1, wherein a positive output terminal of the first battery module is electrically connected with one end of the pre-charge module;
one end of the first control module is electrically connected with one end of the pre-charging module;
the other end of the first control module is electrically connected with the other end of the pre-charging module;
and the positive output end of the second battery module is electrically connected with one end of the second control module.
7. The multi-battery pack parallel control circuit of claim 1, wherein the pre-charge module comprises: the input end of the pre-charging resistor is connected with one end of the pre-charging relay in series.
8. The multi-battery pack parallel control circuit of claim 1, wherein the first control module comprises: a first charging relay, a first discharging relay, and a first common cathode diode;
a first anode of the first common cathode diode is electrically connected with one end of the first charging relay;
the common cathode of the first common cathode diode is respectively and electrically connected with the other end of the first charging relay and one end of the first discharging relay;
the second anode of the first common cathode diode is electrically connected with the other end of the first discharge relay;
the other end of the first charging relay is electrically connected with one end of the first discharging relay.
9. The multi-battery pack parallel control circuit of claim 1, wherein the second control module comprises: the second charging relay, the second discharging relay and the second common cathode diode;
the first anode of the second common cathode diode is electrically connected with one end of the second charging relay;
the common cathode of the second common cathode diode is respectively and electrically connected with the other end of the second charging relay and one end of the second discharging relay;
the second anode of the second common cathode diode is electrically connected with the other end of the second discharge relay;
the other end of the second charging relay is electrically connected with one end of the second discharging relay.
10. The multi-cell pack parallel control circuit of claim 1, wherein the cell pack is a lithium cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321740720.2U CN220368495U (en) | 2023-07-04 | 2023-07-04 | Multi-battery pack parallel control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321740720.2U CN220368495U (en) | 2023-07-04 | 2023-07-04 | Multi-battery pack parallel control circuit |
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| CN220368495U true CN220368495U (en) | 2024-01-19 |
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| CN202321740720.2U Active CN220368495U (en) | 2023-07-04 | 2023-07-04 | Multi-battery pack parallel control circuit |
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