CN218661383U - Power battery system and vehicle - Google Patents

Abstract

The utility model discloses a power battery system and vehicle, wherein, power battery system includes power battery, and power battery includes: the battery comprises a plurality of first battery cell units, a plurality of second battery cell units and a plurality of battery modules, wherein the plurality of first battery cell units are connected in series to form a low-voltage energy unit; and the second battery cell units and the low-voltage energy unit are connected in series to form a high-voltage energy unit. Therefore, the low-voltage energy unit can be reused, the structure of the power battery system can be simplified, and the integration level of the power battery system can be improved.

Description

Power battery system and vehicle

Technical Field

The utility model relates to a power battery technical field especially relates to a power battery system and vehicle.

Background

In electric automobile, the direct current power supply demand voltage phase difference of different equipment when the car is in operation is great, can't realize unified power supply through voltage conversion circuit, consequently, in the correlation technique, can independently set up high voltage power supply module and low pressure power supply module in electric automobile's power battery system usually to satisfy electric automobile's different power supply demands, but this can lead to power battery system's structure complicacy, and occupy more on-vehicle space, and the integration level is not high.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, a first object of the present invention is to provide a power battery system, which comprises a plurality of first electrical core units connected in series to form a low voltage energy unit, and a plurality of second electrical core units connected in series to form a high voltage energy unit, so that the power battery system can output different voltages to satisfy the requirements of low voltage and high voltage power supply, thereby realizing multiplexing of the low voltage energy unit, simplifying the structure of the power battery system, and improving the integration degree of the power battery system.

A second object of the present invention is to provide a vehicle.

In order to achieve the above object, an embodiment of the present invention provides a power battery system, where the system includes a power battery, and the power battery includes: the battery comprises a plurality of first battery cell units, a plurality of second battery cell units and a plurality of battery modules, wherein the plurality of first battery cell units are connected in series to form a low-voltage energy unit; and the second battery cell units and the low-voltage energy unit are connected in series to form a high-voltage energy unit.

According to the utility model discloses power battery system establishes ties through adopting a plurality of first electric core units to constitute low pressure energy unit to and adopt a plurality of second electric core units and low pressure energy unit to establish ties and constitute high pressure energy unit, make power battery system can be through exporting different voltage in order to satisfy low pressure and highly compressed power supply demand, realized low pressure energy unit's multiplexing, thereby simplified power battery system's structure, improved power battery system's integrated level.

According to an embodiment of the present invention, each of the plurality of first cell units is further connected in parallel to at least one third cell unit.

According to an embodiment of the invention, the low voltage energy unit has a plurality of, a plurality of low voltage energy unit parallel connection.

According to an embodiment of the present invention, the first cell unit, the second cell unit and the third cell unit each include at least one cell, and at least one cell is connected in series and/or in parallel.

According to the utility model discloses an embodiment, a plurality of second electricity core units are equallyd divide into first electricity core unit group and second electricity core unit group, and the second electricity core unit in first electricity core unit group and the second electricity core unit group is established ties respectively, and first electricity core unit group, low pressure energy unit and second electricity core unit group establish ties in proper order.

According to the utility model discloses an embodiment, the system still includes: the acquisition unit is connected with the power battery and is used for acquiring voltage information of the power battery; the energy balancing unit is connected with the power battery and is used for balancing the energy of the power battery; and the battery management system is connected with the acquisition unit and the energy balancing unit and is used for controlling the energy balancing unit to perform energy balancing on the low-voltage energy unit and the high-voltage energy unit according to the voltage information.

According to an embodiment of the present invention, the system further comprises: the voltage conversion unit is respectively connected with the high-voltage energy unit and the low-voltage energy unit; the battery management system is also connected with the voltage conversion unit and used for controlling the voltage conversion unit to convert the high voltage of the high-voltage energy unit into the low voltage to charge the low-voltage energy unit or convert the low voltage of the low-voltage energy unit into the high voltage to discharge the low-voltage energy unit.

According to an embodiment of the invention, the capacity of the low voltage energy unit is greater than the capacity of the high voltage energy unit.

According to an embodiment of the present invention, the output voltage of the low voltage energy unit is 6-60V, and the output voltage of the high voltage energy unit is 200-1200V.

In order to achieve the above object, an embodiment of a second aspect of the present invention provides a vehicle, including the aforementioned power battery system.

According to the embodiment of the utility model provides a vehicle, through aforementioned power battery system, can simplify power battery system structure, improve power battery system's integrated level to can save vehicle space, realized the configuration optimization to the vehicle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a power battery system according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a low voltage energy cell according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a high voltage energy unit according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a power battery system according to an embodiment of the present invention;

fig. 5 a-5 b are schematic position diagrams of a low voltage energy unit according to an embodiment of the present invention;

fig. 6 is a circuit diagram of a power battery system according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The following describes a power battery system and a vehicle according to embodiments of the present invention with reference to the drawings.

Fig. 1 is a schematic structural diagram of a power battery system according to an embodiment of the present invention, and referring to fig. 1, the system 100 includes a power battery 110, and the power battery 110 includes: a plurality of first CELL units CELL1 and a plurality of second CELL units CELL2.

The plurality of first CELL units CELL1 are connected in series to form a low-voltage energy unit 111; the plurality of second CELL units CELL2 and the low-voltage energy unit 111 are connected in series to form a high-voltage energy unit 112.

Specifically, referring to fig. 1, the power battery system 100 may perform low-voltage power supply and high-voltage power supply, and when the power battery system 100 needs to perform low-voltage power supply, the power supply positive electrode LV + and the power supply negative electrode LV-of the low-voltage energy unit 111 may be connected to a power supply loop, and discharge is performed through a plurality of first CELL units CELL1 connected in series in the low-voltage energy unit 111 to output low-voltage direct current; when the power battery system 100 needs to perform high-voltage power supply, a power supply positive electrode HV + and a power supply negative electrode HV-of the high-voltage energy unit 112 may be connected to a power supply loop, and discharge is performed simultaneously through a plurality of second CELL units CELL2 connected in series in the high-voltage energy unit 112 and a plurality of first CELL units CELL1 connected in series in the low-voltage energy unit 111 to output high-voltage direct current, so that the power battery system 100 has low-voltage power supply and high-voltage power supply functions. Meanwhile, in the power supply flow, the plurality of first CELL units CELL1 in the low-voltage energy unit 111 discharge when the power battery system 100 supplies power at both low voltage and high voltage, thereby realizing the multiplexing of the low-voltage energy unit 111.

In the above embodiment, the plurality of first electric core units are connected in series to form the low-voltage energy unit, and the plurality of second electric core units and the low-voltage energy unit are connected in series to form the high-voltage energy unit, so that the power battery system can output different voltages to meet the power supply requirements of low voltage and high voltage, the multiplexing of the low-voltage energy unit is realized, the structure of the power battery system is simplified, and the integration level of the system is improved.

In some embodiments, the capacity of the low voltage energy unit is greater than the capacity of the high voltage energy unit.

Specifically, in actual use, since the high-voltage energy cell 112 discharges only when the power battery system 100 is supplied with high voltage power, and the low-voltage energy cell 111 discharges both when the power battery system 100 is supplied with high voltage power and when the power battery system 100 is supplied with low voltage power, the energy consumption rate of the low-voltage energy cell 111 is greater than that of the high-voltage energy cell 112, and when the low-voltage energy cell 111 is equal to the capacity of the high-voltage energy cell 112, an overdischarge phenomenon may occur in the low-voltage energy cell 111, causing the power battery system 100 to malfunction, and reducing the safety of the power battery system 100. Therefore, the capacity of the low voltage energy unit 111 may be set to be greater than the capacity of the high voltage energy unit 112 to compensate for the energy consumption rate of the low voltage energy unit 111, thereby improving the safety of the power battery system.

Further, referring to fig. 2, each first CELL1 in the plurality of first CELL units CELL1 is further connected in parallel to at least one third CELL unit CELL3.

Specifically, since the high voltage energy unit 112 is formed by connecting a plurality of second CELL units CELL2 and the low voltage energy unit 111 in series, the capacity of the high voltage energy unit 112 is equal to the lower capacity of the second CELL unit CELL2 and the low voltage energy unit 111, and thus, if the capacity of the low voltage energy unit 111 is greater than the capacity of the high voltage energy unit 112, the capacity of the low voltage energy unit 111 is greater than the capacity of the second CELL unit CELL2. For example, referring to fig. 2, at least one third CELL unit CELL3 may be connected in parallel to each first CELL unit CELL1, and then the first CELL units CELL1 are connected in series to form the low voltage energy unit 111, where the capacity of the low voltage energy unit 111 is equal to the sum of the capacities of the single first CELL unit CELL1 and the at least one third CELL unit CELL3, and the capacity of the low voltage energy unit 111 may be increased by increasing the number of the third CELL units CELL3 connected in parallel, so as to ensure that the capacity of the first CELL unit CELL1 is greater than that of the high voltage energy unit 112, so as to improve the safety of the power battery system 100; meanwhile, after at least one third CELL unit CELL3 is connected in parallel to each first CELL unit CELL1, the plurality of first CELL units CELL1 are connected in series to form the low-voltage energy unit 111, so that the reliability of the power battery system 100 can be improved. When a certain first CELL unit CELL1 or a third CELL unit CELL3 fails, the low-voltage energy unit 111 can still maintain the low-voltage power supply function.

Therefore, by connecting at least one third battery cell unit in parallel on each first battery cell unit, the capacity of the low-voltage energy unit can be increased, the low-voltage energy unit is larger than the high-voltage energy unit, and the safety of the power battery system is improved; and when a certain first battery cell unit or a third battery cell unit fails, the low-voltage energy unit 111 still keeps the power supply function, so that the reliability of the power battery system is improved.

In some embodiments, referring to fig. 3, the low voltage energy unit 111 has a plurality, and the plurality of low voltage energy units 111 are connected in parallel.

Specifically, referring to fig. 3, a plurality of low-voltage energy units 111 may be provided in the power battery system 100, and the plurality of low-voltage energy units 111 may be connected in parallel, so that the capacities of the plurality of low-voltage energy units 111 may be stacked, and the capacity of the plurality of low-voltage energy units 111 may be increased by increasing the number of low-voltage energy units 111 connected in parallel, thereby ensuring that the capacity of the plurality of low-voltage energy units 111 is greater than that of the high-voltage energy units 112, and improving the safety of the power battery system.

In some embodiments, the first CELL1, the second CELL2, and the third CELL3 each include at least one CELL, and the at least one CELL is connected in series and/or in parallel.

Specifically, the first CELL unit CELL1, the second CELL unit CELL2, and the third CELL unit CELL3 are each formed by at least one CELL, and at least one CELL may be connected in series and/or in parallel, so that the first CELL unit CELL1, the second CELL unit CELL2, and the third CELL unit CELL3 can have appropriate output voltage and capacity. The output voltages and capacities of the first CELL unit CELL1, the second CELL unit CELL2, and the third CELL unit CELL of the first CELL unit can be determined according to the power supply requirements of the power battery system 100, such as power supply requirement accuracy, and the number and the series-parallel connection mode of the CELLs in these CELL units can be further determined.

In some embodiments, referring to fig. 4, the plurality of second CELL units CELL2 are equally divided into a first CELL unit group DYZ1 and a second CELL unit group DYZ2, the second CELL units CELL2 in the first CELL unit group DYZ1 and the second CELL unit group DYZ2 are respectively connected in series, and the first CELL unit group DYZ1, the low-voltage energy unit 111, and the second CELL unit group DYZ2 are sequentially connected in series.

Specifically, since the discharge time of the low-voltage energy unit 111 is longer than that of the second CELL units CELL2, the low-voltage energy unit 111 generates more heat due to discharge, and therefore the second CELL units CELL2 can be equally divided into the first CELL unit group DYZ1 and the second CELL unit group DYZ2, and the first CELL unit group DYZ1, the low-voltage energy unit 111 and the second CELL unit group DYZ2 are sequentially connected in series, so that the low-voltage energy unit 111 is located in the central region of the power battery 110, as shown in fig. 5a to 5b, at this time, the first CELL unit group DYZ1 and the second CELL unit group DYZ2 can achieve a better heat preservation effect on the low-voltage energy unit 111, so that the low-voltage energy unit 111 has a higher temperature and better power output characteristics; meanwhile, because the low-voltage energy unit 111 has a high temperature, the heat emitted by the low-voltage energy unit 111 can be used for heating the first CELL unit group DYZ1 and the second CELL unit group DYZ2, so that the plurality of second CELL units CELL2 of the power battery system 100 also have a good power output characteristic, and the low-temperature performance of the power battery system 100 is improved.

In the above embodiment, the plurality of second cell units are equally divided into the first cell unit group and the second cell unit group, and the first cell unit group, the low-voltage energy unit and the second cell unit group are sequentially connected in series, so that the low-voltage energy unit can be insulated, and the low-voltage energy unit can be used for heating the plurality of cell units, thereby improving the low-temperature performance of the power battery system.

In some embodiments, as shown with reference to fig. 4, the system 100 further comprises: the system comprises an acquisition unit 120, an energy balancing unit 130 and a battery management system (not shown), wherein the acquisition unit 120 is connected with the power battery 110 and is used for acquiring voltage information of the power battery 110; the energy balancing unit 130 is connected to the power battery 110 and is used for balancing energy of the power battery 110; the battery management system is connected to the acquisition unit 120 and the energy balancing unit 130, and is configured to control the energy balancing unit 130 to perform energy balancing on the low-voltage energy unit 111 and the high-voltage energy unit 112 according to the voltage information.

Specifically, as can be seen from the above description, the capacity of the low voltage energy unit 111 needs to be greater than the capacity of the high voltage energy unit 112, and when the power battery 110 is charged, for example, when the power battery 110 is uniformly charged at high voltage, the low voltage energy unit 111 cannot be fully charged, so that the power battery system 100 may be provided with the collecting unit 120, the energy equalizing unit 130, and the battery management system, and when the power battery system 100 is charged, the collecting unit 120 detects the voltage of each of the first CELL1, the second CELL2, and the third CELL3 (for example, the low voltage energy unit 111 has the third CELL 3) in the power battery 110, and outputting the detected voltage information to a battery management system, wherein the battery management system controls the energy balancing unit 130 to adjust the charging voltages of the first CELL unit CELL1 and the second CELL unit CELL2 in the power battery 110 according to the voltage information, so that the first CELL unit CELL1 and the third CELL unit CELL3 in the low-voltage energy unit 111 (if any) can be fully charged, so as to ensure that the electric quantity of the low-voltage energy unit 111 is greater than that of the high-voltage energy unit 112 when the power supply of the power battery system 100 starts, and further ensure the power supply safety of the power battery system.

Further, referring to fig. 6, the system 100 further includes: a voltage conversion unit 140, wherein the voltage conversion unit 140 is respectively connected with the high-voltage energy unit 112 and the low-voltage energy unit 111; the battery management system is further connected to the voltage conversion unit 140 for controlling the voltage conversion unit 140 to convert the high voltage of the high voltage energy unit 112 into the low voltage for charging the low voltage energy unit 111, or to convert the low voltage of the low voltage energy unit 111 into the high voltage for discharging the low voltage energy unit 111.

Specifically, during the charging or discharging process of the power battery 110, the amount of electricity in the low-voltage energy unit 111 may be abnormal due to the inconsistency between the durations of the high-voltage discharge and the low-voltage discharge, and the power supply function of the power battery system 100 may be abnormal, for example, during the charging process, the low-voltage energy unit 111 may not be fully charged. Therefore, referring to fig. 6, a voltage conversion unit 140 may be added to the power battery system 100, when the battery management system determines that the electric quantity of the low-voltage energy unit 111 is too low, the high voltage of the high-voltage energy unit 112 may be converted into a low voltage by the voltage conversion unit 140, and then the low voltage is charged to the low-voltage energy unit 111 through the power supply positive electrode LV + and the power supply negative electrode LV of the low-voltage energy unit; or, when the battery management system determines that the electric quantity of the low-voltage energy unit 111 is too high, the low voltage of the low-voltage energy unit 111 can be converted into the high voltage through the voltage conversion unit 140, and then the high voltage is discharged through the power supply positive electrode HV + and the power supply negative electrode HV-of the high-voltage energy unit 112, so that the electric quantity of the low-voltage energy unit is prevented from being too low or too high, the power supply function of the power battery system is ensured to be normal, and the safety of the power battery system is improved.

In some embodiments, the output voltage of the low voltage energy unit 111 is 6-60V, and the output voltage of the high voltage energy unit 112 is 200-1200V.

Specifically, the output voltage of the low-voltage energy unit 111 can be set to 6-60 v by setting the number of the first CELL units CELL1 in the low-voltage energy unit 111, so that the power battery system can supply power to a battery management system, a battery controller, a battery heating and cooling system and other low-voltage power supply systems with different power supply voltages; similarly, the number of the second CELL units CELL2 in the high-voltage energy unit 112 may be set, so that the output voltage range of the high-voltage energy unit 112 is 200V to 1200V, and the power battery system 100 obtains a wider high-voltage power supply range to meet power supply requirements of different voltages in a vehicle, thereby improving the applicability of the power battery system.

In summary, according to the power battery system provided by the embodiment of the present invention, the plurality of first battery cell units are connected in series to form the low voltage energy unit, and the plurality of second battery cell units and the low voltage energy unit are connected in series to form the high voltage energy unit, so that the power battery system can output different voltages to meet the power supply requirements of low voltage and high voltage, and the multiplexing of the low voltage energy unit is realized, thereby simplifying the structure of the power battery system and improving the integration level of the system; meanwhile, the third battery cell unit connected in parallel is added on the first battery cell unit, or a plurality of low-voltage energy units are connected in parallel in the power battery system, so that the capacity of the low-voltage energy units is improved, and then the voltage conversion unit is arranged in the power battery system, so that the electric quantity of the low-voltage energy units is maintained in a reasonable range, the power supply function of the power battery system is ensured to be normal, the safety of the power battery system is improved, and the overall optimization of the power battery system is realized.

Corresponding to the above embodiment, the embodiment of the present invention further provides a vehicle, and as shown in fig. 7, the vehicle 10005 includes the power battery system 100 described above.

According to the utility model discloses the vehicle, through aforementioned power battery system, can simplify the power battery system structure, improve power battery system's integrated level to can save the vehicle space, realized the configuration optimization to the vehicle.

It is noted that the logic and/or steps represented in the flowcharts or otherwise described herein may, for example, be

An ordered listing of executable instructions for implementing logical functions can be embodied in any computer-readable medium 0 for use by an instruction execution system, apparatus, or device (e.g., a computer-based system, processor-containing system, or other device)

A system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions), or in conjunction with such instruction execution system, apparatus, or device. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device

An apparatus for use in a device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: having 5 an electrical connection (electronic device) with one or more wires, a portable computer cartridge (magnetic device), a random access

Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via, for instance, optical scanning of the paper or other medium

The program is then electronically obtained by editing, interpreting, or otherwise processing as appropriate, and 0 is then stored in computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented as is known in the art

Any one or combination of the following techniques: discrete logic circuits with logic gate 5 circuits for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable Gate Arrays (PGAs),

field Programmable Gate Arrays (FPGAs), etc.

In the description of the specification, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is intended to be included in the description

Materials or features are included in at least one embodiment or example of the present invention. In this specification, a schematic representation of 0 for the above term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described

Features may be combined in any suitable manner in any one or more of the embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A power battery system, the system comprising a power battery, the power battery comprising:

the battery comprises a plurality of first battery cell units, a plurality of second battery cell units and a plurality of battery modules, wherein the plurality of first battery cell units are connected in series to form a low-voltage energy unit;

the battery pack comprises a plurality of second battery cell units, and the second battery cell units and the low-voltage energy unit are connected in series to form a high-voltage energy unit.

2. The power battery system of claim 1, wherein each first cell unit of the plurality of first cell units is further connected in parallel with at least one third cell unit.

3. The power cell system of claim 1, wherein the low voltage energy unit comprises a plurality of low voltage energy units connected in parallel.

4. The power battery system of claim 2, wherein the first cell unit, the second cell unit, and the third cell unit each comprise at least one cell connected in series and/or in parallel.

5. The power battery system of any of claims 1-4, wherein the plurality of second cell units are each divided into a first cell unit group and a second cell unit group, the second cell units of the first cell unit group and the second cell unit group are respectively connected in series, and the first cell unit group, the low voltage energy unit, and the second cell unit group are sequentially connected in series.

6. The power cell system of any of claims 1-4, further comprising:

the acquisition unit is connected with the power battery and used for acquiring voltage information of the power battery;

the energy balancing unit is connected with the power battery and is used for carrying out energy balancing on the power battery;

and the battery management system is connected with the acquisition unit and the energy balancing unit and used for controlling the energy balancing unit to perform energy balancing on the low-voltage energy unit and the high-voltage energy unit according to the voltage information.

7. The power battery system of claim 6, further comprising:

the voltage conversion unit is respectively connected with the high-voltage energy unit and the low-voltage energy unit;

the battery management system is further connected with the voltage conversion unit and used for controlling the voltage conversion unit to convert the high voltage of the high-voltage energy unit into the low voltage to charge the low-voltage energy unit, or convert the low voltage of the low-voltage energy unit into the high voltage to discharge the low-voltage energy unit.

8. The power cell system of any of claims 1-4, wherein the capacity of the low voltage energy unit is greater than the capacity of the high voltage energy unit.

9. The power battery system according to any of claims 1-4, wherein the output voltage of the low-voltage energy unit is 6-60V and the output voltage of the high-voltage energy unit is 200-1200V.

10. A vehicle, characterized in that it comprises a power battery system according to any of claims 1-9.

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