CN116418069A - Battery system control PDU (protocol data unit) for serial-parallel conversion and control method - Google Patents
Battery system control PDU (protocol data unit) for serial-parallel conversion and control method Download PDFInfo
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- CN116418069A CN116418069A CN202111675144.3A CN202111675144A CN116418069A CN 116418069 A CN116418069 A CN 116418069A CN 202111675144 A CN202111675144 A CN 202111675144A CN 116418069 A CN116418069 A CN 116418069A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 12
- 238000009434 installation Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0025—Sequential battery discharge in systems with a plurality of batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a battery system control PDU for serial-parallel conversion and a control method thereof. The battery system control PDU used for serial-parallel conversion has the advantages that all positive interfaces and negative interfaces of the battery pack interface group are provided with independent direct current relay control access, so that the use of elements can be reduced, the cost is saved, the occupation of space is reduced, the arrangement of the elements of the battery system control PDU is facilitated, and the size of the battery system control PDU is further reduced; and the serial-parallel conversion among a plurality of battery packs can be realized more safely, and then the switching of high-voltage charging and low-voltage discharging of the battery packs is realized through the battery system control PDU, so that the charging time of customers can be shortened, the adaptability of the products for multiple purposes is increased, and the unification of charging piles is facilitated. Besides, the number of the battery packs for realizing serial-parallel conversion is increased conveniently by adding the battery pack interface groups and the change-over switch groups of each battery pack interface group according to actual conditions.
Description
Technical Field
The invention relates to the field of new energy lithium battery control systems, in particular to a battery system control PDU (protocol data unit) for serial-parallel conversion and a control method.
Background
At present, the charging requirement of special pure electric equipment (such as a new energy automobile) is improved, but the equipment is required to realize low-voltage discharge, so that the battery system control PDU is required to realize internal high-low voltage switching, the internal system structure is switched to high voltage during charging, the internal system structure is switched to low voltage during discharging, the high-low switching is solved, the unification of charging piles is realized, the charging time of a customer is shortened, but the conventional battery system control PDU can only realize high-voltage charging and discharging or low-voltage charging and discharging, and therefore, the need for a battery system control PDU capable of realizing high-voltage charging and low-voltage discharging simultaneously is urgent.
Disclosure of Invention
The invention aims at: aiming at the problem that the prior art battery system control PDU can only realize high-voltage charge and discharge or low-voltage charge and discharge and has influence on the charge time when a customer uses, the battery system control PDU and the control method for serial-parallel conversion are provided.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a battery system control PDU for serial-parallel conversion, wherein a positive electrode main circuit is electrically connected with a positive electrode interface, and a negative electrode main circuit is electrically connected with a negative electrode interface; the battery system control PDU comprises N battery pack interface groups, a change-over switch group of each battery pack interface group, at least one charging interface group and at least one output interface group, wherein N is greater than or equal to 1;
The charging positive electrode of the charging interface group and the output positive end of the output interface group are respectively and electrically connected to the positive electrode main road; the charging negative electrode of the charging interface group and the output negative end of the output interface group are respectively and electrically connected to the negative electrode main road, and a direct current relay is arranged between at least three of the charging positive electrode, the output positive end, the charging negative electrode and the output negative end and the corresponding positive electrode main road or negative electrode main road respectively;
the positive electrode main road and/or the negative electrode main road are/is connected with a protection device;
each transfer switch group comprises three direct current relays, and the direct current relays of the transfer switch groups are respectively arranged between the negative electrode interface of the battery pack interface group and the negative electrode main road, between the positive electrode interface of the battery pack interface group and the positive electrode main road and between the positive electrode interface of the battery pack interface group and the negative electrode interface of the battery pack interface group; when all the direct current relays between the positive electrode interfaces and the negative electrode interfaces of the battery pack interface group are closed, a serial charging loop is formed; and when the direct current relays between the positive electrode interfaces and the positive electrode main circuit corresponding to each battery pack interface group and the direct current relays between all the negative electrode interfaces and the negative electrode main circuit are closed, a parallel discharge loop is formed.
The protection device is electrically connected to the positive electrode main circuit and/or the negative electrode main circuit and is used for protecting a circuit of the battery system control PDU. Each battery pack interface group is provided with an anode interface connected with the anode of the battery pack and a cathode interface connected with the cathode of the battery pack, and the anode and the cathode of the battery of the same battery pack interface group are not connected with the same battery pack. The positive electrode interface directly and electrically connected with the positive electrode main circuit and the negative electrode interface directly and electrically connected with the negative electrode main circuit are also interfaces for connecting corresponding poles of the battery pack. The N+1 battery packs are connected with the positive electrode trunk circuit and the negative electrode trunk circuit, and when the charging equipment is connected with the positive electrode trunk circuit and the negative electrode trunk circuit through the charging interface group, the charging equipment can charge the battery packs connected with the battery system control PDU; after the external equipment is connected with the positive main road and the negative main road through the output interface group, the battery pack connected with the battery system control PDU can supply power for the external equipment.
In the scheme, when a battery pack of the special pure electric equipment is charged, after a charging pile is connected with a charging positive electrode and a charging negative electrode of a battery system control PDU, a charging interface group is connected with a positive electrode main circuit and a negative electrode main circuit, direct current relays between positive electrode interfaces and negative electrode interfaces of all the battery pack interface groups are closed to form a serial loop of n+1 battery packs, and the charging pile is used for charging all the battery packs in series at high voltage, so that the charging efficiency can be improved, and the charging time is shortened; when the external equipment connected with the positive output end and the negative output end needs to be powered, the output interface is connected with the positive main circuit and the negative main circuit in a connecting mode, and when all direct-current relays between the positive interfaces and the positive main circuit and all direct-current relays between the negative interfaces and the negative main circuit are closed, a parallel loop of N+1 battery packs is formed, and all the battery packs supply power to the external equipment in a parallel low-voltage mode, so that energy consumption is saved.
The battery system control PDU for serial-parallel conversion adopts the scheme, the positive electrode interfaces and the negative electrode interfaces of all the battery pack interface groups are respectively provided with independent direct current relay control access, firstly, the diodes are not required to be adopted to realize current non-backflow, and then cooling equipment is not required to be arranged to ensure normal operation of the diodes, so that the use of elements can be reduced, the cost is saved, the occupation of space is reduced, the arrangement of the elements of the battery system control PDU is facilitated, and the volume of the battery system control PDU is further reduced; and secondly, the serial-parallel conversion among a plurality of battery packs can be realized more safely, and then the switching of high-voltage charging and low-voltage discharging of the battery packs is realized through a battery system control PDU, so that the charging time of customers can be shortened, the adaptability of the products for multiple purposes is improved, and the unification of charging piles is facilitated. Besides, the battery system control PDU comprises N battery pack interface groups and a change-over switch group of each battery pack interface group, N is larger than or equal to 1, namely, at least two battery packs can be subjected to serial-parallel conversion through the battery system control PDU, and the number of the battery packs for realizing serial-parallel conversion can be increased by increasing the battery pack interface groups and the change-over switch groups of each battery pack interface group, so that the battery packs which can be accessed by the battery system control PDU can be modified according to actual conditions. The charging positive electrode and the charging negative electrode can also be used as output ends, namely, the charging positive electrode, the charging negative electrode, the output positive end and the output negative end can exist at the same time, the charging positive electrode, the charging negative electrode, the output positive end and the output negative end can be selectively connected in series and/or in parallel at different output ends, a plurality of states can exist at the same time, and the adaptability of multiple purposes of products can be improved.
Preferably, all the direct current relays, the positive electrode interfaces, the negative electrode interfaces, the protection device, the charging interface group and the output interface group are connected through conductive bars;
all the battery pack interface groups are longitudinally and sequentially distributed between the positive electrode interfaces directly and electrically connected with the positive electrode trunk and the negative electrode interfaces directly and electrically connected with the negative electrode trunk, and all the positive electrode interfaces and all the negative electrode interfaces are correspondingly arranged up and down and are arranged in a staggered manner.
The conductive bars can be copper conductive bars and the like, have certain hardness and shape, and are convenient to install and fix; the battery pack can bear larger current, and is beneficial to high-low voltage conversion of the battery pack through a battery system control PDU; the positive interfaces and the negative interfaces can be longitudinally staggered, the positive interfaces are arranged below the negative interfaces, and the positive interfaces and the negative interfaces connected with the same battery pack are adjacently arranged, so that the positive interfaces and the negative interfaces are divided, and the battery pack is convenient to install; and each component can be more reasonably arranged, so that the arrangement of the battery system control PDU is more orderly, and the occupation of space can be reduced. Meanwhile, through the orderly arrangement mode, a battery pack interface group and a change-over switch group of each battery pack interface group are added between the positive electrode interface directly electrically connected with the positive electrode main road and the negative electrode interface directly electrically connected with the negative electrode main road, so that the access quantity of battery packs is increased, and the applicability is improved.
Preferably, all positive electrode interfaces are located at the same height, all negative electrode interfaces are located at the same height, the distances between two adjacent positive electrode interfaces are the same, the distances between two adjacent negative electrode interfaces are the same, the battery pack can be conveniently installed at the same height, connection is convenient, and applicability is improved.
Preferably, in the circuit of the battery system control PDU, the dc relay between the negative electrode interface and the negative electrode trunk is a sixth dc relay, the dc relay between the positive electrode interface and the positive electrode trunk is a fifth dc relay, and the dc relay between the positive electrode interface and the negative electrode interface of the battery pack interface group is a fourth dc relay;
in the element structure arrangement of the battery system control PDU, corresponding fourth direct current relay, sixth direct current relay and fifth direct current relay are arranged between the positive electrode interface and the negative electrode interface of each battery pack interface group in sequence along the transverse direction from the position close to the corresponding battery pack interface group; all the fourth direct current relays are distributed in a longitudinal line, all the fifth direct current relays are distributed in a longitudinal line, all the sixth direct current relays are distributed in a longitudinal line, and all the fourth direct current relays, all the fifth direct current relays and all the sixth direct current relays are all arranged in a longitudinal line; the fourth direct current relay and the sixth direct current relay are the same in height as the negative electrode interface, and all the fifth direct current relays are the same in height as the positive electrode interface; the positive ends of the sixth direct current relay and the fifth direct current relay between two adjacent battery pack interface groups are opposite to the positive end of the fourth direct current relay, and the negative ends of the fourth direct current relay, the positive ends of the sixth direct current relay and the negative ends of the fifth direct current relay between two adjacent battery pack interface groups are distributed along the transverse direction side by side.
The fifth direct current relay, the sixth direct current relay and the fourth direct current relay are arranged between the positive electrode interface and the negative electrode interface of each battery pack interface group, which is equivalent to integrating the direct current relay for realizing serial-parallel conversion between two battery packs between the transverse directions of the two battery packs, so that the occupation of space can be reduced. Through above-mentioned structural arrangement setting, the direct current relay of whole change over switch group is arranged orderly, positive electrode interface and negative electrode interface are arranged orderly for every the negative electrode interface of battery package interface group can be directly through the electrically conductive row of horizontal setting connect the negative end of corresponding sixth direct current relay and the positive end of fourth direct current relay simultaneously, every the positive electrode interface of battery package interface group can be through the electrically conductive row direct connection of horizontal setting corresponds the positive end of fifth direct current relay, can reduce the required quantity and the required length of electrically conductive row, and then can reduce the occupation in space, can reduce the integrated volume of place quick-witted case of battery system control PDU, is favorable to the installation of machine case. And the above-mentioned arrangement mode makes the structure of the conducting bar between the transfer switch group of battery package interface group and every battery package interface group can set up unanimously, is favorable to processing, installation and change.
Preferably, negative terminals of two adjacent fifth direct current relays are connected through a first connecting conductive bar, positive terminals of two adjacent sixth direct current relays are connected through a second connecting conductive bar, and the first connecting conductive bar is located above the corresponding second connecting conductive bar.
Through the connection mode, the negative electrode parallel circuit is not directly connected to the negative electrode main circuit, but is indirectly connected to the negative electrode main circuit by connecting the positive ends of the adjacent sixth direct current relays, so that the number and the length of the conductive bars required by the negative electrode parallel circuit can be reduced, the cost is saved, and the occupation of space is reduced; similarly, the positive pole parallel circuit is not directly connected to the positive pole main circuit, but indirectly connected to the positive pole main circuit by connecting the negative ends of the adjacent fifth direct current relays, so that the number and the length of the conductive bars required by the positive pole parallel circuit can be reduced, the cost is saved, and the occupation of the space is reduced.
Preferably, a direct current relay is arranged between the charging positive electrode, the output positive end and the output negative end and the corresponding positive electrode trunk or negative electrode trunk respectively, and the charging negative electrode is directly and electrically connected with the negative electrode trunk.
The direct-current relay is not arranged on the charging anode and the anode main circuit to conduct circuit connection control, the influence on circuit safety is small, but the setting number of the relay can be reduced, and the cost is reduced.
Preferably, the direct current relay further comprises a control unit, and all the direct current relays are respectively connected with the control unit. The control unit only needs to collect the voltage states at two ends of the corresponding direct current relay contact to judge the on-off state of the corresponding direct current relay, and then controls the external switch state of the corresponding direct current relay to realize the serial-parallel switching of all battery packs connected by the positive electrode interface and the negative electrode interface.
Preferably, the protection device comprises a fuse and a shunt.
The fuse and the current divider are respectively positioned on a main circuit of the battery system control PDU, the fuse is a protection device of the whole circuit, and the current divider is a current acquisition unit of the whole circuit and is used for acquiring current, and when the current is too large, charging or discharging can be limited.
Preferably, the current divider is located on the cathode trunk, and the fuse is located on the anode trunk, so that components of the battery system control PDU are arranged and installed in the chassis.
Preferably, each cascade unit has only three switching relays, so that the cost is reduced.
When the connection of the interfaces of the charging interface group is identified, the direct current relays between the positive electrode interfaces and the negative electrode interfaces of all the battery pack interface groups are closed, and the direct current relays between all the positive electrode interfaces and the positive electrode trunk circuit and the direct current relays between all the negative electrode interfaces and the negative electrode trunk circuit are disconnected to form a serial charging loop;
when the interfaces of the output interface groups are identified to be connected, the direct current relays between the positive electrode interfaces and the positive electrode trunk corresponding to each battery pack interface group and the direct current relays between all the negative electrode interfaces and the negative electrode trunk are closed, and the direct current relays between the positive electrode interfaces and the negative electrode interfaces of all the battery pack interface groups are disconnected to form a parallel charging loop.
By the control method for the control PDU of the battery system for serial-parallel conversion, the serial connection and the parallel connection of the battery packs can be quickly converted, so that the charging time of a customer is shortened, and the energy consumption of external equipment in power utilization is reduced.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. According to the battery system control PDU for serial-parallel conversion, all the positive electrode interfaces and the negative electrode interfaces of the battery pack interface group are provided with independent direct current relay control access, so that the use of elements can be reduced, the cost is saved, the occupation of space is reduced, the arrangement of the elements of the battery system control PDU is facilitated, and the volume of the battery system control PDU is further reduced; and the serial-parallel conversion among a plurality of battery packs can be realized more safely, and then the switching of high-voltage charging and low-voltage discharging of the battery packs is realized through the battery system control PDU, so that the charging time of customers can be shortened, the adaptability of the products for multiple purposes is increased, and the unification of charging piles is facilitated. Besides, by adding the battery pack interface groups and the change-over switch groups of each battery pack interface group, the number of battery packs for realizing serial-parallel conversion can be increased, and the battery packs which can be accessed by the battery system control PDU can be modified according to actual conditions.
2. By adopting the conductive bar connecting circuit, all the positive electrode interfaces and all the negative electrode interfaces can be longitudinally staggered, the positive electrode interfaces are arranged below the upper electrode interfaces and the lower electrode interfaces, and the positive electrode interfaces and the negative electrode interfaces connected with the same battery pack are adjacently arranged, so that the positive electrode interfaces and the negative electrode interfaces are divided, and the battery pack is convenient to install; and each component can be more reasonably arranged, so that the arrangement of the battery system control PDU is more orderly, and the occupation of space can be reduced.
3. The direct current relay for realizing serial-parallel conversion between the two battery packs is integrated between the two battery packs in the transverse direction, so that the occupation of space can be reduced.
4. The direct current relays of whole change over switch group arrange orderly, anodal interface and negative pole interface arrange orderly for every the negative pole interface of battery package interface group can be directly through the conducting bar that transversely sets up simultaneously connect the negative end of corresponding sixth direct current relay and the positive end of fourth direct current relay, every the anodal interface of battery package interface group can be through the conducting bar direct connection that transversely sets up the positive end of corresponding fifth direct current relay, can reduce the required quantity and the required length of conducting bar, and then can reduce the occupation in space, can reduce the volume of the integrated quick-witted case that is located of battery system control PDU, is favorable to the installation of machine case. And the structure of the conducting bars between the battery pack interface groups and the change-over switch groups of each battery pack interface group can be set to be consistent, thereby being beneficial to processing, installation and replacement.
5. The control method of the battery system control PDU for serial-parallel conversion can quickly realize the quick conversion of serial connection and parallel connection of the battery packs, is beneficial to shortening the charging time of customers and reducing the energy consumption when external equipment is powered on.
Drawings
Fig. 1 is a circuit schematic diagram of a battery system control PDU for serial-parallel conversion described in embodiment 1;
fig. 2 is a schematic diagram of the structure of the battery system control PDU for serial-parallel conversion described in embodiment 1;
FIG. 3 is a front view of the battery system control PDU for serial-parallel conversion depicted in FIG. 2;
FIG. 4 is a top view of the battery system control PDU for serial-parallel conversion depicted in FIG. 2;
FIG. 5 is a bottom view of the battery system control PDU for serial-parallel conversion depicted in FIG. 2;
FIG. 6 is a left side view of the battery system control PDU for serial-parallel conversion depicted in FIG. 2;
FIG. 7 is a right side view of the battery system control PDU for serial-parallel conversion depicted in FIG. 2;
icon: 1-an anode trunk; 11-a charging positive electrode; 12-an output positive terminal; 13-a second dc relay; 14-a first dc relay; 2-a cathode trunk; 21-a charged anode; 22-negative output terminal; 23-a third dc relay; 31-fourth dc relay; 311-series conductive bars; 32-a fifth dc relay; 321-first connecting conductive bars; 33-sixth dc relay; 331-second connecting conductive bars; 34-positive interface; 35-negative electrode interface; 36-battery pack interface group; a 4-fuse; 41-an uplink conductive bar; 5-a shunt; 61-1 st positive conductor bar; 62-2 nd positive conductive bar; 63-3 rd positive conductor bar; 71-1 st negative conductor bar; 72-2 nd negative conductive bar; 73-3 rd negative conductor bar.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
A battery system control PDU for serial-parallel conversion, referring to fig. 1, a positive electrode interface 34 is electrically connected to a positive electrode trunk 1, and a negative electrode interface 35 is electrically connected to a negative electrode trunk 2; the battery system control PDU comprises N battery pack interface groups 36, a change-over switch group of each battery pack interface group 36, at least one charging interface group and at least one output interface group, wherein N is greater than or equal to 1;
the charging anode 11 of the charging interface group and the output anode 12 of the output interface group are respectively and electrically connected to the anode main road 1; the charging negative electrode 21 of the charging interface group and the output negative electrode 22 of the output interface group are respectively and electrically connected to the negative electrode main trunk circuit 2, and a direct current relay is arranged between at least three of the charging positive electrode 11, the output positive end 12, the charging negative electrode 21 and the output negative electrode 22 and the corresponding positive electrode main trunk circuit 1 or negative electrode main trunk circuit 2 respectively;
The positive electrode main channel 1 and/or the positive electrode main channel the negative electrode main road 2 is connected with a protection device;
each transfer switch group comprises three direct current relays, and the direct current relays of the transfer switch groups are respectively arranged between the negative electrode interface 35 of the battery pack interface group 36 and the negative electrode main road 2, between the positive electrode interface 34 of the battery pack interface group 36 and the positive electrode main road 1, and between the positive electrode interface 34 and the negative electrode interface 35 of the battery pack interface group 36; when all the direct current relays between the positive electrode interface 34 and the negative electrode interface 35 of the battery pack interface group 36 are closed, a series charging loop is formed; when the dc relays between the positive electrode interfaces 34 and the positive electrode trunk 1, and the dc relays between all the negative electrode interfaces 35 and the negative electrode trunk 2, which correspond to each of the battery pack interface groups 36, are all closed, a parallel discharge loop is formed.
Each battery pack interface group 36 has a positive electrode interface 34 for connecting the positive electrode of the battery pack and a negative electrode interface 35 for connecting the negative electrode of the battery pack, and the positive electrode and the negative electrode of the battery of the same battery pack interface group 36 are not connected to the same battery pack. As shown in fig. 1, BV 1-and bv2+ are a battery pack interface group 36, BV 2-and bv3+ are a battery pack interface group 36, but BV 1-and bv1+ are connected to the positive and negative electrodes of the same battery pack, bv2+ and bv2-are connected to the positive and negative electrodes of the same battery pack, and bv3+ and bv3-are connected to the positive and negative electrodes of the same battery pack. The positive electrode interface 34 directly electrically connected to the positive electrode main circuit 1 and the negative electrode interface 35 directly electrically connected to the negative electrode main circuit 2 are also interfaces for connecting corresponding poles of the battery pack, such as bv1+ and bv3-in fig. 1, and no dc relay is provided for control.
In the scheme, N+1 battery packs are connected with the positive electrode trunk road 1 and the negative electrode trunk road 2, and when charging equipment is connected with the positive electrode trunk road 1 and the negative electrode trunk road 2 through the charging interface group, the charging equipment can charge the battery packs connected with the battery system control PDU; after the external equipment is connected with the positive main road 1 and the negative main road 2 through the output interface group, the battery pack connected with the battery system control PDU can supply power for the external equipment. As shown in fig. 1, there are two battery pack interface groups 36 in total, corresponding to the serial-parallel connection of 3 battery packs.
In this scheme, the charging interface group and the output interface group can increase, and quantity is selected according to actual conditions, but have at least a group respectively. As a preferred embodiment, as shown in the circuit in fig. 1, a dc relay is provided between the charging positive electrode 11, the output positive terminal 12 and the output negative terminal 22 and the corresponding positive electrode main circuit 1 or negative electrode main circuit 2, respectively, and the charging negative electrode 21 is directly electrically connected to the negative electrode main circuit 2. That is, the charging negative electrode 21 and the negative electrode main path 2 are not provided with a direct current relay to perform the circuit on control, and the influence on the circuit safety is small, but the number of the relays to be provided can be reduced, and the cost can be reduced. Specifically, the charging positive electrode 11 is electrically connected to the positive end of the second dc relay 13, the negative end of the second dc relay 13 is electrically connected to the positive main shaft 1, and the charging negative electrode 21 is directly electrically connected to the negative main shaft 2. The output positive end 12 is electrically connected with the negative end of the first direct current relay 14, the positive end of the first direct current relay 14 is electrically connected with the positive main circuit 1, the output negative end 22 is electrically connected with the positive end of the third direct current relay 23, and the negative end of the third direct current relay 23 is electrically connected with the negative main circuit 2.
In this embodiment, the protection device is electrically connected to the positive electrode trunk 1 and/or the negative electrode trunk 2, and is used for protecting the circuit of the battery system control PDU. Such as: the protection device comprises a fuse 4, a shunt 5 and the like. The fuse 4 and the shunt 5 are respectively located on a main circuit of the battery system control PDU, the fuse 4 is a protection device of the whole circuit, and the shunt 5 is a current collection unit of the whole circuit and is used for collecting current, and when the current is too large, charging or discharging can be limited. As a preferred implementation option, as shown in fig. 4, the shunt 5 is located on the cathode trunk 2, and the fuse 4 is located on the anode trunk 1, so that components of the battery system control PDU are arranged and installed in the chassis.
In this embodiment, the battery system control PDU further includes a control unit, and all the dc relays are connected to the control unit respectively. The control unit only needs to collect the voltage states at two ends of the corresponding direct current relay contact to judge the on-off state of the corresponding direct current relay, and then controls the external switch state of the corresponding direct current relay to realize the serial-parallel switching of all battery packs connected by the positive electrode interface 34 and the negative electrode interface 35.
When the battery pack of the special pure electric equipment is charged, after the charging pile is connected with the charging positive electrode 11 and the charging negative electrode 21 of the battery system control PDU for serial-parallel conversion, the charging interface group is connected with the positive electrode main road 1 and the negative electrode main road 2, direct-current relays between the positive electrode interface 34 and the negative electrode interface 35 of the battery pack interface group 36 are all closed, a serial loop of N+1 battery packs is formed, the charging pile is used for charging all the battery packs in series at high voltage, the charging efficiency can be improved, the charging time is shortened, the circuit in FIG. 1 is taken as an example, namely, the RelayB in FIG. 1 is closed, the RelayA and the RelayC are opened, the SKA and the SKB in FIG. 1 are closed, and PK1-, PK2-, PK3+ are opened, so that a serial loop of 3 battery packs is formed; when the external equipment connected with the output positive end 12 and the output negative end 22 needs to be powered, the output interface is connected with the positive main road 1 and the negative main road 2 in a connecting way, the direct current relays between all the positive interfaces 34 and the positive main road 1 and the direct current relays between all the negative interfaces 35 and the negative main road 2 are closed, and (3) forming a parallel loop of N+1 battery packs, wherein all the battery packs supply power to the external equipment in parallel at low voltage, so that energy consumption is saved, and taking a circuit in FIG. 1 as an example, namely, a circuit in FIG. 1 is opened, a circuit A and a circuit C are closed, a circuit in FIG. 1 is opened, a circuit in which SKA and SKB are opened, and a circuit in which PK1-, PK2+, PK 2-and PK3+ are closed, so as to form a parallel loop of 3 battery packs.
In this embodiment, all the dc relays, the positive electrode interface 34, the negative electrode interface 35, the protection device, the charging interface group and the output interface group are connected by conductive bars; the conductive bars can be copper conductive bars and the like, have certain hardness and shape, and are convenient to install and fix; and can bear bigger electric current, be favorable to the battery package to carry out high-low voltage conversion and use through battery system control PDU.
The battery system control PDU for serial-parallel conversion of the embodiment is adopted, the positive electrode interface 34 and the negative electrode interface 35 of all the battery pack interface groups 36 are provided with independent direct current relay control access, firstly, no diode is needed to be adopted to realize that current does not flow back, and no cooling equipment is needed to be arranged to ensure the normal operation of the diode, so that the use of elements can be reduced, the cost is saved, the occupation of space is reduced, the arrangement of the elements of the battery system control PDU is facilitated, and the volume of the battery system control PDU is further reduced; and secondly, the serial-parallel conversion among a plurality of battery packs can be realized more safely, and then the switching of high-voltage charging and low-voltage discharging of the battery packs is realized through a battery system control PDU, so that the charging time of customers can be shortened, the adaptability of the products for multiple purposes is improved, and the unification of charging piles is facilitated. Besides, the battery system control PDU includes N battery pack interface groups 36 and a change-over switch group of each battery pack interface group 36, where N is greater than or equal to 1, that is, at least two battery packs can be converted in series-parallel through the battery system control PDU, and by adding the battery pack interface groups 36 and the change-over switch groups of each battery pack interface group 36, the number of battery packs for realizing series-parallel conversion can be increased, so that the battery packs that can be accessed by the battery system control PDU can be modified according to actual situations. The charging positive electrode 11 and the charging negative electrode 21 can also be used as output ends, that is, four output ends of the charging positive electrode 11, the charging negative electrode 21, the output positive end 12 and the output negative end 22 can exist at the same time, and can be selectively connected in series and/or in parallel at different output ends, and a plurality of states can exist at the same time, so that the adaptability of multiple purposes of the product can be improved.
Example 2
The present embodiment provides a battery system control PDU for serial-parallel conversion, which may be identical to the circuit in the embodiment, but the present embodiment focuses more on the arrangement of circuit elements, as shown in fig. 2-7:
in order to facilitate arrangement and description of circuit elements to be clearer and more accurate, a part of direct current relays in the circuit are named as follows: in the circuit of the battery system control PDU, the dc relay between the negative electrode interface 35 and the negative electrode trunk 2 is a sixth dc relay 33, the dc relay between the positive electrode interface 34 and the positive electrode trunk 1 is a fifth dc relay 32, and the dc relay between the positive electrode interface 34 and the negative electrode interface 35 of the battery pack interface group 36 is a fourth dc relay 31; the direct current relay between the charging positive electrode 11 and the positive electrode main road 1 is a second direct current relay 13, the direct current relay between the output positive end 12 and the positive electrode main road 1 is a first direct current relay 14, and the direct current relay between the output negative end 22 and the negative electrode main road 2 is a third direct current relay 23. In addition, as shown in fig. 4, the left-right direction is defined as the vertical direction, and the up-down direction is defined as the horizontal direction.
In this embodiment, all the conductive bars, dc relays, fuses 4 and shunts 5 are disposed in the chassis. In this embodiment, the dc relay, the positive electrode interface 34, the negative electrode interface 35, the protection device, the charging interface group and the output interface group are all connected by conductive bars; so that all the positive electrode interfaces 34 and all the negative electrode interfaces 35 can be staggered in the longitudinal direction, that is: as shown in fig. 3, all the battery pack interface groups 36 are sequentially distributed between the positive electrode interfaces 34 directly electrically connected to the positive electrode trunk 1 and the negative electrode interfaces 35 directly electrically connected to the negative electrode trunk 2 in the longitudinal direction, and all the positive electrode interfaces 34 and all the negative electrode interfaces 35 are correspondingly arranged up and down and are arranged in a staggered manner.
The positive electrode interface 34 is arranged below the upper and negative electrode interfaces 35, and the positive electrode interface 34 and the negative electrode interface 35 which are connected with the same battery pack are adjacently arranged, so that the positive electrode interface 34 and the negative electrode interface 35 are divided, and the battery pack is convenient to install; and each component can be more reasonably arranged, so that the arrangement of the battery system control PDU is more orderly, and the occupation of space can be reduced. Meanwhile, through the orderly arrangement mode, the battery pack interface groups 36 and the change-over switch groups of each battery pack interface group 36 are added between the positive electrode interface 34 directly electrically connected with the positive electrode main road 1 and the negative electrode interface 35 directly electrically connected with the negative electrode main road 2, so that the access quantity of battery packs is increased, and the applicability is improved.
In this embodiment, in order to facilitate the installation of the battery packs to improve the applicability, the battery packs are installed at the same height, and the intervals between the positive electrode interfaces 34 and the negative electrode interfaces 35, which are correspondingly connected with the positive electrode interfaces and the negative electrode interfaces of each battery pack, are fixed, as shown in fig. 3, all the positive electrode interfaces 34 are located at the same height, all the negative electrode interfaces 35 are located at the same height, the intervals between two adjacent positive electrode interfaces 34 are the same, and the intervals between two adjacent negative electrode interfaces 35 are the same, namely, the positive electrode interfaces 34 and the negative electrode interfaces 35 of 3 battery packs are sequentially arranged from left to right, so that the three battery packs are orderly arranged.
In this embodiment, in order to make the arrangement of the dc relay, the conductive bar, etc. orderly and compact, the occupation of space is reduced. In the element structure arrangement of the battery system control PDU, the fourth dc relay 31, the sixth dc relay 33, and the fifth dc relay 32 are sequentially arranged between the positive electrode interface 34 and the negative electrode interface 35 of each of the battery pack interface groups 36 in the lateral direction from the vicinity of the corresponding battery pack interface group 36. In general, each transfer switch group has only one fourth dc relay 31, one sixth dc relay 33 and one fifth dc relay 32, as shown in fig. 4, between the positive electrode interface 34 and the negative electrode interface 35 of each battery pack interface group 36, and a corresponding fourth dc relay 31, one sixth dc relay 33 and one fifth dc relay 32 are sequentially arranged in the lateral direction from the vicinity of the corresponding battery pack interface group 36; all the fourth dc relays 31 are distributed in a longitudinal row, all the fifth dc relays 32 are distributed in a longitudinal row, all the sixth dc relays 33 are distributed in a longitudinal row, and the positive ends of all the fourth dc relays 31, all the fifth dc relays 32 and all the sixth dc relays 33 are longitudinally arranged; the fourth dc relay 31 and the sixth dc relay 33 are all the same as the negative electrode interface 35, and the fifth dc relay 32 is all the same as the positive electrode interface 34; the positive ends of the sixth dc relay 33 and the fifth dc relay 32 between two adjacent battery pack interface groups 36 are opposite to the positive end of the fourth dc relay 31, and the negative ends of the fourth dc relay 31, the positive end of the sixth dc relay 33, and the negative end of the fifth dc relay 32 between two adjacent battery pack interface groups 36 are distributed side by side in the lateral direction.
As shown in fig. 4, the fifth dc relay 32, the sixth dc relay 33, and the fourth dc relay 31 are disposed between the positive electrode interface 34 and the negative electrode interface 35 of each of the battery pack interface groups 36, which is equivalent to integrating the dc relay for implementing serial-parallel conversion between two battery packs between the lateral directions of the two battery packs, so that space occupation can be reduced. Through the above-mentioned structural arrangement setting, the direct current relay of whole change over switch group is arranged orderly, positive electrode interface 34 and negative electrode interface 35 are arranged orderly for every negative electrode interface 35 of battery package interface group 36 can be directly through the electrically conductive row of horizontal setting simultaneously connect the negative end of corresponding sixth direct current relay 33 and the positive end of fourth direct current relay 31, every the positive electrode interface 34 of battery package interface group 36 can be through the electrically conductive row direct connection of horizontal setting corresponding positive end of fifth direct current relay 32, can reduce the required quantity and the required length of electrically conductive row, and then can reduce the occupation of space, can reduce the integrated volume of place quick-witted case of battery system control PDU, is favorable to the installation of machine case. The arrangement mode enables the structure of the conductive bars between the battery pack interface groups 36 and the change-over switch group of each battery pack interface group 36 to be consistent, and is beneficial to processing, installation and replacement.
Taking the battery system control PDU of the three battery packs in fig. 1-7 as an example, in fig. 2, the left side in the transverse direction is a positive electrode interface 34 and a negative electrode interface 35 which are arranged up and down and are staggered, the right side in the transverse direction is a charging interface group and an output interface group, the middle in the transverse direction is two transfer switch groups, and the two transfer switch groups are aligned and distributed in the longitudinal direction. The correspondence between the elements of fig. 3 and fig. 1 is: in fig. 3, the upper left positive electrode interface 34 is bv1+, the lower left negative electrode interface 35 is bv1-, the upper middle positive electrode interface 34 is bv2+, the lower middle negative electrode interface 35 is bv2-, the upper right positive electrode interface 34 is bv3+, and the lower right negative electrode interface 35 is bv3-. In fig. 4, two vertical transfer switch groups are respectively located between BV 1-and BV2+ and between BV 2-and BV3+, each transfer switch group is sequentially provided with a fourth dc relay 31, a sixth dc relay 33 and a fifth dc relay 32 from bottom to top, the fifth dc relay 32 is higher than the fourth dc relay 31 and the sixth dc relay 33, the fourth dc relay 31 of the transfer switch group is provided with a left end as a positive end, a right end as a negative end, the sixth dc relay 33 and the fifth dc relay 32 of the transfer switch group are provided with a left end as a negative end, and a right end as a positive end; BV1+ is horizontally connected with the left fifth DC relay 32 through the 1 st positive conductive row 61, the middle part of the 1 st positive conductive row 61 is connected with the positive main circuit 1 where the fuse 4 is positioned, BV1-is horizontally connected with the positive end of the left fourth DC relay 31 and the negative end of the sixth DC relay 33 along the transverse direction through the 1 st negative conductive row 71, BV2+ is horizontally connected with the positive end of the left fifth DC relay 32 along the transverse direction through the 2 nd positive conductive row 62, BV 2-is horizontally connected with the positive end of the right fourth DC relay 31 and the negative end of the sixth DC relay 33 along the transverse direction through the 2 nd negative conductive row 72, BV3+ is transversely and horizontally connected with the positive end of the right fifth direct current relay 32 through the 3 rd positive conductive row 63, BV 3-is transversely and horizontally connected with the negative main circuit 2 where the current divider 5 is positioned through the 3 rd negative conductive row 73, the middle part of the 3 rd negative conductive row 73 is connected with the positive end of the right sixth direct current relay 33, wherein the negative end of the left fourth direct current relay 31 is connected with the 2 nd positive conductive row 62 through the upward vertical folded serial conductive row 311, and the negative end of the right fourth direct current relay 31 is connected with the 3 rd positive conductive row 63 through the upward vertical folded serial conductive row 311; the positive ends of the left and right adjacent two sixth direct current relays 33 are connected through the second connecting conductive row 331 to form a negative parallel branch of BV1-, and the negative ends of the left and right adjacent two fifth direct current relays 32 are connected through the first connecting conductive row 321 to form a positive parallel branch of BV 3+.
The configuration of the conductive traces between the battery pack interface groups 36 and the switch groups of each battery pack interface group 36 in fig. 2-7 can be configured to be consistent to facilitate machining, installation, and replacement. And a preferred embodiment is adopted, negative terminals of two adjacent fifth dc relays 32 are connected through a first connecting conductive bar 321, positive terminals of two adjacent sixth dc relays 33 are connected through a second connecting conductive bar 331, and the first connecting conductive bar 321 is located above the corresponding second connecting conductive bar 331. The negative electrode parallel circuit is indirectly connected to the negative electrode main circuit 2 by connecting the positive ends of the adjacent sixth direct current relays 33 instead of being directly connected to the negative electrode main circuit 2, so that the number and the length of the conductive bars required by the negative electrode parallel circuit can be reduced, the cost is saved, and the occupation of space is reduced; similarly, the positive parallel circuit is not directly connected to the positive main circuit 1, but indirectly connected to the positive main circuit 1 by connecting the negative ends of the adjacent fifth direct current relays 32, so that the number and the length of the conductive bars required by the positive parallel circuit can be reduced, the cost is saved, and the occupation of space is reduced.
In this embodiment, the two external connection interface groups are connected to the positive electrode trunk circuit 1 and the negative electrode trunk circuit 2, and a plurality of conductive bars are also required, and the charging positive electrode 11, the charging negative electrode 21 of the output positive end 12 and the output negative electrode 22 are all located at the same height and are consistent with the height of the positive electrode interface 34; the second dc relay 13, the first dc relay 14 and the third dc relay 23 are all located at the same level, which is identical to the fourth dc relay 31. The positive main circuit 1 has an uplink conductive bar 41, the uplink conductive bar 41 is in an upward inclined structure, the lower end of the uplink conductive bar 41 is connected with the positive end of the first dc relay 14, the upper end of the uplink conductive bar is connected with the fuse 4, and by arranging the uplink conductive bar 41, the positive main circuit 1, the fifth dc relay 32 and the 1 st positive conductive bar 61 are prevented from being arranged at the same height, and insulation columns for supporting the positive main circuit 1 can be reduced.
Example 3
In this embodiment, a control method for a battery system control PDU for serial-parallel conversion as in example 1 or 2 is provided, when it is identified that the interfaces of the charging interface group are turned on, the dc relays between the positive electrode interfaces 34 and the negative electrode interfaces 35 of all the battery pack interface groups 36 are closed, and the dc relays between all the positive electrode interfaces 34 and the positive electrode trunk 1 and the dc relays between all the negative electrode interfaces 35 and the negative electrode trunk 2 are opened, so as to form a serial charging circuit; the series circuit can connect all the positive electrode interfaces 34 and all the negative electrode interfaces 35 to the battery pack series circuit, and the battery pack is charged through the charging pile;
When the connection of the interfaces of the output interface groups is identified, the direct current relays between the positive electrode interfaces 34 and the positive electrode main circuit 1 corresponding to each battery pack interface group 36 and the direct current relays between all the negative electrode interfaces 35 and the negative electrode main circuit 2 are closed, and the direct current relays between the positive electrode interfaces 34 and the negative electrode interfaces 35 of all the battery pack interface groups 36 are opened to form a parallel charging loop; the parallel circuit may be a battery pack that connects the positive electrode interface 34 and the negative electrode interface 35 of the partial battery pack interface group 36 and the positive electrode interface 34 and the negative electrode interface 35 directly connected by the trunk in parallel to the trunk, so as to realize that the partial battery pack is connected in parallel to the trunk, and the partial battery pack can be used for discharging and supplying to external equipment; the parallel circuit may be a battery pack in which all the positive electrode interfaces 34 and negative electrode interfaces 35 of the battery pack interface group 36 and the positive electrode interfaces 34 and negative electrode interfaces 35 directly connected to the main circuit are connected in parallel to the main circuit, so that all the battery packs are connected in parallel to the main circuit, and all the battery packs are used for discharging and supplying to external devices.
In this embodiment, the opening and closing of all the dc relays are directly controlled by the control unit, and the control unit will make related instructions when detecting and receiving corresponding electrical signals. By the control method for the control PDU of the battery system for serial-parallel conversion, the serial connection and the parallel connection of the battery packs can be quickly converted, so that the charging time of a customer is shortened, and the energy consumption of external equipment in power utilization is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The battery system control PDU for serial-parallel conversion is characterized in that a positive electrode main circuit (1) is electrically connected with a positive electrode interface (34), and a negative electrode main circuit (2) is electrically connected with a negative electrode interface (35); the battery system control PDU is characterized by comprising N battery pack interface groups (36), a change-over switch group of each battery pack interface group (36), at least one charging interface group and at least one output interface group, wherein N is greater than or equal to 1;
the charging positive electrode (11) of the charging interface group and the output positive end (12) of the output interface group are respectively and electrically connected to the positive electrode main road (1); the charging negative electrode (21) of the charging interface group and the output negative electrode (22) of the output interface group are respectively and electrically connected to the negative electrode main road (2), and at least three of the charging positive electrode (11), the output positive end (12), the charging negative electrode (21) and the output negative electrode (22) are respectively provided with a direct current relay with the corresponding positive electrode main road (1) or negative electrode main road (2);
The positive electrode main road (1) and/or the negative electrode main road (2) are/is connected with a protection device;
each transfer switch group comprises three direct current relays, and the direct current relays of the transfer switch groups are respectively arranged between a negative electrode interface (35) of the battery pack interface group (36) and the negative electrode main road (2), between a positive electrode interface (34) of the battery pack interface group (36) and the positive electrode main road (1) and between the positive electrode interface (34) of the battery pack interface group (36) and the negative electrode interface (35); when all the direct current relays between the positive electrode interfaces (34) and the negative electrode interfaces (35) of the battery pack interface group (36) are closed, a serial charging loop is formed; and when the direct current relay between the positive electrode interface (34) corresponding to each battery pack interface group (36) and the positive electrode main circuit (1) and the direct current relay between all the negative electrode interfaces (35) and the negative electrode main circuit (2) are closed, a parallel discharge loop is formed.
2. The battery system control PDU for serial-parallel conversion according to claim 1, wherein all of the dc relay, positive electrode interface (34), negative electrode interface (35), protection device, charging interface group and output interface group are connected by a conductive bar;
All battery pack interface groups (36) are longitudinally distributed between the positive electrode interfaces (34) directly electrically connected with the positive electrode main road (1) and the negative electrode interfaces (35) directly electrically connected with the negative electrode main road (2), and all the positive electrode interfaces (34) and all the negative electrode interfaces (35) are correspondingly arranged up and down and are arranged in a staggered mode.
3. The battery system control PDU for serial-parallel conversion according to claim 2, wherein all the positive electrode interfaces (34) are located at the same height, all the negative electrode interfaces (35) are located at the same height, the pitch of two adjacent positive electrode interfaces (34) is the same, and the pitch of two adjacent negative electrode interfaces (35) is the same.
4. A battery system control PDU for serial-parallel conversion according to claim 3, characterized in that the dc relay between the negative electrode interface (35) and the negative electrode trunk (2) is a sixth dc relay (33), the dc relay between the positive electrode interface (34) and the positive electrode trunk (1) is a fifth dc relay (32), and the dc relay between the positive electrode interface (34) and the negative electrode interface (35) of the battery pack interface group (36) is a fourth dc relay (31);
the fourth direct current relay (31), the sixth direct current relay (33) and the fifth direct current relay (32) are sequentially arranged between the positive electrode interface (34) and the negative electrode interface (35) of each battery pack interface group (36) along the transverse direction from the position close to the corresponding battery pack interface group (36); all the fourth direct current relays (31) are distributed in a longitudinal line, all the fifth direct current relays (32) are distributed in a longitudinal line, all the sixth direct current relays (33) are distributed in a longitudinal line, and all the fourth direct current relays (31), all the fifth direct current relays (32) and all the sixth direct current relays (33) are arranged in a longitudinal line; the fourth direct current relay (31) and the sixth direct current relay (33) are the same in height as the negative electrode interface (35), and all the fifth direct current relays (32) are the same in height as the positive electrode interface (34); the positive ends of the sixth direct current relay (33) and the fifth direct current relay (32) between two adjacent battery pack interface groups (36) are opposite to the positive end of the fourth direct current relay (31), and the negative ends of the fourth direct current relay (31), the positive ends of the sixth direct current relay (33) and the negative ends of the fifth direct current relay (32) between two adjacent battery pack interface groups (36) are distributed side by side along the transverse direction.
5. The battery system control PDU for serial-parallel conversion according to claim 4, wherein negative terminals of two adjacent fifth dc relays (32) are connected by a first connecting conductive bar (321), positive terminals of two adjacent sixth dc relays (33) are connected by a second connecting conductive bar (331), and the first connecting conductive bar (321) is located above the corresponding second connecting conductive bar (331).
6. The battery system control PDU for serial-parallel conversion according to any one of claims 1 to 5, wherein a dc relay is provided between the charging positive electrode (11), the output positive terminal (12) and the output negative terminal (22) and the corresponding positive electrode trunk (1) or negative electrode trunk (2), respectively, and the charging negative electrode (21) is directly electrically connected to the negative electrode trunk (2).
7. The battery system control PDU for serial-parallel conversion of claim 6, further comprising a control unit, wherein all the dc relays are connected to the control unit, respectively.
8. Battery system control PDU for serial-parallel conversion according to any of claims 1-5, characterized in that the protection means comprises a fuse (4) and a shunt (5).
9. The battery system control PDU for serial-parallel conversion according to claim 8, wherein the shunt (5) is located at the negative main circuit (1) and the fuse (4) is located at the positive main circuit (2).
10. A control method for a battery system control PDU for serial-parallel conversion according to any one of claims 1 to 9, characterized in that when it is recognized that the interfaces of the charging interface group are on, the direct current relays between the positive electrode interfaces (34) and the negative electrode interfaces (35) of all the battery pack interface groups (36) are closed, the direct current relays between all the positive electrode interfaces (34) and the positive electrode trunk (1) and the direct current relays between all the negative electrode interfaces (35) and the negative electrode trunk (2) are opened to form a serial charging loop;
when the interfaces of the output interface groups are identified to be connected, the direct current relays between the positive electrode interfaces (34) and the positive electrode main circuit (1) corresponding to each battery pack interface group (36) and the direct current relays between the negative electrode interfaces (35) and the negative electrode main circuit (2) are all closed, and the direct current relays between the positive electrode interfaces (34) and the negative electrode interfaces (35) of all the battery pack interface groups (36) are all disconnected to form a parallel charging loop.
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| CN118523033A (en) * | 2024-07-24 | 2024-08-20 | 戴天新能源科技(上海)有限公司 | Voltage-current conversion device and electronic equipment |
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