CN116001572A - Battery pack and battery pack management method - Google Patents
Battery pack and battery pack management method Download PDFInfo
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- CN116001572A CN116001572A CN202211593615.0A CN202211593615A CN116001572A CN 116001572 A CN116001572 A CN 116001572A CN 202211593615 A CN202211593615 A CN 202211593615A CN 116001572 A CN116001572 A CN 116001572A
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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
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention relates to the technical field of batteries of electric automobiles, in particular to a battery pack and a battery pack management method. A battery pack includes: a high voltage power battery, a low voltage power battery, a DC/DC converter and a battery management system; the positive electrode and the negative electrode of the high-voltage power battery pack and the positive electrode and the negative electrode of the low-voltage power battery pack are respectively connected with the same battery management system; the high-voltage power battery pack and the battery management system form a high-voltage power charging and discharging loop, and the low-voltage power supply battery pack and the battery management system form a low-voltage power supply charging and discharging loop; the high-voltage power battery pack is connected in series through a fourth relay low-voltage power battery pack, and the high-voltage power battery pack is connected into the low-voltage power supply charging and discharging loop through a DC/DC converter. After the technical scheme is adopted, one set of battery management system meets the monitoring and safety guarantee of the high-voltage power battery and the low-voltage power battery, two batteries are arranged in one battery pack, wiring harnesses and connectors are saved, and the charging efficiency is improved from a charging strategy.
Description
Technical Field
The invention relates to the technical field of batteries of electric automobiles, in particular to a battery pack and a battery pack management method.
Background
With the advance of new energy strategy, electric automobiles are rapidly developed. The battery of the electric automobile generally comprises a high-voltage power battery and a low-voltage power supply battery, wherein the high-voltage power battery provides power for the whole automobile, and the low-voltage power supply battery provides power for a whole automobile system, such as a combination meter, a whole automobile controller, a power battery controller and a remote control system.
In the existing electric automobile, a high-voltage power battery and a low-voltage power supply battery are respectively arranged in independent battery packs, each battery pack is provided with an independent BMS (battery management system), the cost of two sets of completely independent systems is very high, and meanwhile, the wiring difficulty of the whole electric automobile of a wired system is high, and the cost of a wire harness and a connector are high. And the low-voltage power supply battery completely depends on the high-voltage power battery to charge, so that the charging efficiency is low, and when the vehicle does not run, if the low-voltage power supply battery feeds and disconnects the low-voltage power supply charging and discharging loop, the power cannot be externally output and supplied.
Therefore, providing a battery pack that combines a high-voltage power battery and a low-voltage power supply battery in one battery pack and shares one battery management system is a technical problem to be solved.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a battery pack and a battery pack management method, and provide a battery management system to meet the monitoring and safety guarantee of a high-voltage power battery and a low-voltage power battery, so that a battery management system is saved, meanwhile, two batteries are arranged in one battery pack, the cost of a wire harness and a connector is saved, and the charging efficiency is improved from the aspect of a charging strategy.
The invention discloses a battery pack, comprising: a high voltage power battery, a low voltage power battery, a DC/DC converter and a battery management system; the positive electrode and the negative electrode of the high-voltage power battery pack and the positive electrode and the negative electrode of the low-voltage power battery pack are respectively connected with the same battery management system; the high-voltage power battery pack and the battery management system form a high-voltage power charging and discharging loop, and the low-voltage power supply battery pack and the battery management system form a low-voltage power supply charging and discharging loop; the high-voltage power battery pack is connected with the low-voltage power supply battery pack in series through a fourth relay, and the high-voltage power battery pack is connected into the low-voltage power supply charging and discharging loop through a DC/DC converter.
Further, a selection switch is arranged between the negative end of the high-voltage power charging and discharging loop and the negative end of the low-voltage power supply charging and discharging loop, and the other end of the selection switch is connected with the negative end of the output end of the charging device.
Further, the positive electrode of the high-voltage power battery pack is connected with a first relay to form a positive end of the high-voltage power charging and discharging loop, and the first relay is connected with a pre-charging relay unit in parallel; the negative electrode of the high-voltage power battery pack is connected with a third relay to form the negative end of the high-voltage power charging and discharging loop; and the positive electrode of the low-voltage power supply battery pack is connected with the fifth relay to form the positive end of the low-voltage power supply charge-discharge loop, and the negative electrode of the low-voltage power supply battery pack is connected with the seventh relay to form the negative end of the low-voltage power supply charge-discharge loop.
Further, a first current sensor is arranged between the negative electrode of the high-voltage power battery pack and the third relay, a second current sensor is arranged between the negative electrode of the low-voltage power battery pack and the seventh relay, and the battery management system is respectively connected with the first current sensor and the second current sensor.
Further, the battery management system is used for waking up the DC/DC converter when the feed of the low-voltage power supply battery pack is disconnected from the fifth relay, controlling the high-voltage power battery pack to supply power to the low-voltage power supply charging and discharging loop, and simultaneously charging the low-voltage power supply battery pack.
Further, the battery management system includes: a high voltage circuit module and a low voltage circuit module; the high-voltage circuit module is used for monitoring the cell state of the battery pack, and the low-voltage circuit module is used for detecting the low-voltage circuit of the battery pack and carrying out logic control on the battery pack.
Further, the high-voltage circuit module further comprises an insulation detection unit, a high-voltage sampling unit and a cell balancing unit; the low-voltage circuit module further comprises loop detection, low-voltage sampling, a communication unit, a wake-up unit, a relay control unit and a thermal management unit.
Further, each external interface of the battery pack is provided with a short circuit diagnosis module.
The invention also discloses a battery pack management method which is applied to the battery pack and comprises the following steps: and (3) discharge management: the positive end and the negative end of the high-voltage power charging and discharging loop are connected with the positive end and the negative end of the discharging interface, the high-voltage power charging and discharging loop is controlled to be conducted, the DC/DC converter is started, the high-voltage power battery pack supplies power to the low-voltage power supply charging and discharging loop, and meanwhile, the low-voltage power supply battery pack is charged; charging management: the positive end and the negative end of the high-voltage charging and discharging loop are connected with the positive end and the negative end of the charging interface, the high-voltage power charging and discharging loop is controlled to be conducted, the electric quantity of the low-voltage power supply battery pack is detected, and if the low-voltage power supply battery pack is in a full-charge state, the charging device is controlled to charge the high-voltage power battery pack independently; and if the low-voltage power supply battery pack is not in a full charge state, controlling the charging device to charge the high-voltage power battery pack and the low-voltage power supply battery pack simultaneously.
Further, the charge management includes: the positive end of the high-voltage charge-discharge loop is connected with the positive end of the charging device, and if the low-voltage power supply battery pack is in a full charge state, the battery management system controls the selection switch to be connected with the negative end of the high-voltage charge-discharge loop, and the charging device independently charges the high-voltage power battery pack; and if the low-voltage power supply battery pack is not in a full charge state, the battery management system controls the selection switch to be connected to the negative end of the low-voltage power supply charge-discharge loop, the fourth relay is closed, and the charging device charges the high-voltage power battery pack and the low-voltage power supply battery pack simultaneously.
Further, when the high-voltage power charging and discharging loop is not in a discharging state, if the low-voltage power supply battery pack is fed to disconnect the fifth relay, the battery management system wakes up the DC/DC converter, controls the high-voltage power battery pack to supply power to the low-voltage power supply charging and discharging loop, and simultaneously charges the low-voltage power supply battery pack.
Further, the system also comprises health detection and management of the battery pack, wherein the health detection and management of the battery pack comprises loop detection, temperature detection, low-voltage sampling, communication function, wake-up function, thermal management function, insulation detection, high-voltage sampling and cell balancing function.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. providing a battery management system to simultaneously meet the monitoring and safety guarantee of a high-voltage power battery pack and a low-voltage power battery pack, and saving the battery management system;
2. meanwhile, two batteries are arranged in one battery pack, so that the cost of the wire harness and the connector is saved;
3. the low-voltage power supply battery pack can be charged by using an external charging device together with the high-voltage power battery pack, so that the charging efficiency is improved, the low-voltage power supply battery pack is not independently charged by the high-voltage power battery pack through the DC/DC converter, the charging efficiency is improved, and the service life of the battery is prolonged.
4. Even when the vehicle does not run, the low-voltage power supply charging and discharging loop can be supplied with power and the low-voltage power supply battery pack can be charged, so that the situation that the whole vehicle cannot be started due to feeding of the low-voltage power supply battery pack is effectively avoided.
Drawings
Fig. 1 is a schematic view of a battery pack according to the present invention;
FIG. 2 is a block diagram of a battery management system according to the present invention;
FIG. 3 is a flow chart of the battery pack discharge management according to the present invention;
fig. 4 is a flow chart of battery pack charge management according to the present invention.
Reference numerals:
1-high-voltage power battery, 2-low-voltage power battery, 31-first relay, 32-second relay, 33-third relay, 34-fourth relay, 35-fifth relay, 36-sixth relay, 37-seventh relay, 4-battery management system, 5-DC/DC converter, 61-first current sensor, 62-second current sensor.
Detailed Description
Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus consistent with some aspects of the disclosure as detailed in the accompanying claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be a direct connection between two elements, or may be an indirect connection via an intermediary, as would be understood by one of ordinary skill in the art in view of the specific meaning of the terms.
In one aspect, the present invention provides a battery pack, referring to fig. 1, which shows a schematic diagram of a battery pack structure according to the present invention, the battery pack includes a high-voltage power battery pack 1, a low-voltage power battery pack 2, a DC/DC converter 5, and a battery management system 4; the positive electrode and the negative electrode of the high-voltage power battery pack 1 and the positive electrode and the negative electrode of the low-voltage power battery pack 2 are respectively connected with the same battery management system 4; the high-voltage power battery pack 1 and the battery management system 4 form a high-voltage power charging and discharging loop, and the low-voltage power supply battery pack 2 and the battery management system 4 form a low-voltage power supply charging and discharging loop; the high-voltage power battery pack 1 is connected in series with the low-voltage power supply battery pack 2 through a fourth relay 34, and the high-voltage power battery pack 1 is connected into the low-voltage power supply charging and discharging loop through a DC/DC converter 5.
As can be seen from fig. 1, the positive electrode of the high-voltage power battery pack 1 is connected with the first relay 31 to form the positive end of the high-voltage power charge-discharge circuit, and the negative electrode of the high-voltage power battery pack 1 is connected with the third relay 33 to form the negative end of the high-voltage power charge-discharge circuit. The first relay 31 is connected with the pre-charging relay unit in parallel, the pre-charging relay unit comprises a second relay 32 and a resistor connected with the second relay 32 in series, and the pre-charging relay is used for avoiding the excessive instantaneous current of high voltage electricity on the system. The positive pole of the low-voltage power supply battery pack 2 is connected with the fifth relay 35 to form the positive end of the low-voltage power supply charge-discharge loop, and the negative pole is connected with the seventh relay 37 to form the negative end of the low-voltage power supply charge-discharge loop.
In this embodiment, the fifth relay 35 and the seventh relay 37 are normally closed relays to maintain low-voltage power supply of the whole vehicle.
Preferably, in this embodiment, a selection switch is disposed between the negative terminal of the high-voltage charging and discharging circuit and the negative terminal of the low-voltage power supply charging and discharging circuit, and the other end of the selection switch is connected with the negative terminal of the output end of the charging device. With continued reference to fig. 1, the selector switch selects the sixth relay 36.
When the high-voltage power battery pack 1 discharges, the fourth relay 34 and the sixth relay 36 are kept in an open state, the battery management system 4 controls the first relay 31 and the third relay 33 to be closed, the positive end of the high-voltage charge-discharge circuit is connected with the positive end of the discharge interface, the negative end of the high-voltage charge-discharge circuit is connected with the negative end of the discharge interface, and the high-voltage charge-discharge circuit is communicated with the high-voltage charge-discharge circuit to output high voltage for the whole vehicle and provide power for the electric vehicle. Meanwhile, the battery management system 4 controls the starting of the DC/DC converter 5, and the high voltage power output by the high voltage power battery 1 is converted into low voltage power by the DC/DC converter 5 and then supplied to the low voltage power supply charging and discharging circuit, and simultaneously charges the low voltage power supply battery 2.
When the high-voltage power battery pack 1 is charged, the battery management system 4 controls the first relay 31 and the third relay 33 to be closed and communicated with the high-voltage charge-discharge circuit, the fourth relay 34 and the sixth relay 36 keep an open state, and the positive end of the high-voltage charge-discharge circuit is connected with the positive end (i.e., the positive end of the charge interface in fig. 1) of the output end of the charging device (for example, the charge pile); the battery management system 4 detects the electric quantity of the low-voltage power supply battery pack 2, if the low-voltage power supply battery pack 2 is in a full charge state, the fourth relay 34 is kept in an off state, the sixth relay 36 is connected to the negative end of the high-voltage charge-discharge loop, and at this time, a charging device independently charges the high-voltage power battery pack 1; if the low-voltage power supply battery pack 2 is not in a full charge state, the battery management system 4 controls the fourth relay 34 to be closed, the sixth relay 36 is connected to the negative end of the low-voltage power supply charge-discharge circuit, at this time, the high-voltage power battery pack 1 and the low-voltage power supply battery pack 2 are connected in series in a charging circuit, and the charging device charges the high-voltage power battery pack 1 and the low-voltage power supply battery pack 2 at the same time. If the low-voltage power supply battery pack 2 is detected to be in the full charge state again, the fourth relay 34 is disconnected, the sixth relay 36 is switched to the negative end of the high-voltage charge-discharge circuit, and the high-voltage power battery pack 1 is continuously charged alone.
The high-voltage power battery pack 1 and the low-voltage power battery pack 2 are combined in the same battery pack, the same battery management system 4 is used together, wiring harnesses and connectors are saved, meanwhile, the low-voltage power battery pack 2 can be charged with the high-voltage power battery pack 1 by using an external charging device, so that charging efficiency is improved, the high-voltage power battery pack 1 is not independently relied on to charge the low-voltage power battery pack 2 through a DC/DC converter, charging efficiency is improved, and battery life is prolonged.
A first current sensor 61 is disposed between the negative electrode of the high-voltage power battery pack 1 and the third relay 33, a second current sensor 62 is disposed between the negative electrode of the low-voltage power battery pack 2 and the seventh relay 37, and the battery management system 4 is respectively connected with the first current sensor 61 and the second current sensor 62, so as to supply power to the first current sensor 61 and the second current sensor 62 on one hand, and receive current data collected by the first current sensor 61 and the second current sensor 62 on the other hand.
Preferably, in this embodiment, the battery management system 4 includes a wake-up unit, configured to wake up the DC/DC converter when the low-voltage power supply battery pack 2 is fed to disconnect the fifth relay 35, and control the high-voltage power battery pack 1 to supply power to the low-voltage power supply charge-discharge circuit, while charging the low-voltage power supply battery pack 2.
Therefore, even when the vehicle is not running, the low-voltage power supply charging and discharging loop can be supplied with power and the low-voltage power supply battery pack 2 can be charged, and the situation that the whole vehicle cannot be started due to the feeding of the low-voltage power supply battery pack 2 is effectively avoided.
Referring to fig. 2, there is shown a block diagram of a battery management system according to the present invention, the battery management system 4 including: a high voltage circuit module and a low voltage circuit module; the high-voltage circuit module is used for monitoring the state of the battery core of the battery pack and comprises voltage, temperature and current of the battery core, and the low-voltage circuit module is used for detecting a low-voltage circuit of the battery pack and carrying out logic control on the battery pack.
It should be understood that, in the battery technology field, the battery management system is mainly used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, monitoring the state of the battery, specifically including monitoring the state of a battery core (voltage, temperature and current) and related algorithms of the battery, and other functions including voltage sampling, relay control, insulation detection, loop detection and some fault handling mechanisms. Therefore, in addition to connecting the high-voltage power battery pack 1 and the low-voltage power supply battery pack 2 to the same battery management system 4, the functions that the battery management system should have are not particularly limited, and preferably, the high-voltage circuit module further includes an insulation detection unit, a high-voltage sampling unit, and a cell balancing unit; the low-voltage circuit module further comprises loop detection, low-voltage sampling, a communication unit, a wake-up unit, a relay control unit, a thermal management unit and the like, and the corresponding functions of the battery management system belong to the prior art and are not described herein.
Preferably, each external interface of the battery pack is provided with a short circuit diagnosis module. Because the battery pack of the invention comprises the high-voltage power battery pack 1 and the low-voltage power battery pack 2, for safety, in specific application, a short circuit diagnosis module is arranged for all external interfaces including the low-voltage external interface, and the creepage distance between wiring is increased, so that the safety and reliability of the battery pack are further improved.
Referring to fig. 3 and 4, another aspect of the present invention provides a battery pack management method, which is applied to the above battery pack, including:
and (3) discharge management:
the positive end and the negative end of the high-voltage power charging and discharging loop are connected with the positive end and the negative end of the discharging interface,
the positive end of the high-voltage charge-discharge loop is connected with the positive end of the discharge interface, and the negative end of the high-voltage charge-discharge loop is connected with the negative end of the discharge interface;
the high-voltage power charge-discharge loop is controlled to be conducted,
the fourth relay 34 and the sixth relay 36 are kept in an open state, the battery management system 4 controls the first relay 31 and the third relay 33 to be closed, and the high-voltage charge-discharge loop is communicated, so that high-voltage electricity is output to the whole vehicle, and power is provided for the electric vehicle;
starting a DC/DC converter, wherein the high-voltage power battery pack supplies power to the low-voltage power supply charging and discharging loop, and simultaneously charges the low-voltage power supply battery pack,
the battery management system 4 controls the starting of the DC/DC converter 5, and the high-voltage power output by the high-voltage power battery pack 1 is converted into low voltage power by the DC/DC converter 5 and then supplies power to the low-voltage power supply charging and discharging loop, and simultaneously charges the low-voltage power supply battery pack 2;
charging management:
the positive end and the negative end of the high-voltage power charging and discharging loop are connected with the positive end and the negative end of the charging interface,
the high-voltage power charge-discharge loop is controlled to be conducted,
the fourth relay 34 and the sixth relay 36 are kept in an open state, and the battery management system 4 controls the first relay 31 and the third relay 33 to be closed so as to communicate with the high-voltage charge-discharge circuit;
the charge of the low voltage powered battery pack is detected,
the battery management system 4 detects the electric quantity of the low-voltage power supply battery pack 2;
if the low-voltage power supply battery pack is in a full charge state, the charging device is controlled to charge the high-voltage power battery pack independently; if the low-voltage power supply battery pack is not in a full charge state, controlling a charging device to charge the high-voltage power battery pack and the low-voltage power supply battery pack simultaneously;
specifically, if the low-voltage power supply battery pack 2 is in a full charge state, the fourth relay 34 is kept in an off state, and the sixth relay 36 is connected to the negative end of the high-voltage charge-discharge circuit, and at this time, the charging device solely charges the high-voltage power battery pack 1; if the low-voltage power supply battery pack 2 is not in a full charge state, the battery management system 4 controls the fourth relay 34 to be closed, the sixth relay 36 is connected to the negative end of the low-voltage power supply charge-discharge circuit, at this time, the high-voltage power battery pack 1 and the low-voltage power supply battery pack 2 are connected in series in a charging circuit, and the charging device charges the high-voltage power battery pack 1 and the low-voltage power supply battery pack 2 at the same time. If the low-voltage power supply battery pack 2 is detected to be in the full charge state again, the fourth relay 34 is disconnected, the sixth relay 36 is switched to the negative end of the high-voltage charge-discharge circuit, and the high-voltage power battery pack 1 is continuously charged alone.
Preferably, when the high-voltage power charging/discharging circuit is not in a discharging state, if the low-voltage power supply battery pack 2 is fed to disconnect the fifth relay 35, the battery management system 4 wakes up the DC/DC converter 5, controls the high-voltage power battery pack 1 to supply power to the low-voltage power supply charging/discharging circuit, and simultaneously charges the low-voltage power supply battery pack 2.
Preferably, the system further comprises health detection and management of the battery pack, wherein the health detection and management of the battery pack comprises loop detection, temperature detection, low-voltage sampling, thermal management, insulation detection, high-voltage sampling, cell balancing function and the like.
It should be noted that the embodiments of the present invention are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical scope of the present invention.
Claims (12)
1. A battery pack, comprising:
a high voltage power battery, a low voltage power battery, a DC/DC converter and a battery management system;
the positive electrode and the negative electrode of the high-voltage power battery pack and the positive electrode and the negative electrode of the low-voltage power battery pack are respectively connected with the same battery management system; the high-voltage power battery pack and the battery management system form a high-voltage power charging and discharging loop, and the low-voltage power supply battery pack and the battery management system form a low-voltage power supply charging and discharging loop;
the high-voltage power battery pack is connected with the low-voltage power supply battery pack in series through a fourth relay, and the high-voltage power battery pack is connected into the low-voltage power supply charging and discharging loop through a DC/DC converter.
2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
a selection switch is arranged between the negative end of the high-voltage power charging and discharging loop and the negative end of the low-voltage power supply charging and discharging loop, and the other end of the selection switch is connected with the negative end of the output end of the charging device.
3. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
the positive electrode of the high-voltage power battery pack is connected with a first relay to form a positive end of the high-voltage power charging and discharging loop, and the first relay is connected with a pre-charging relay unit in parallel; the negative electrode of the high-voltage power battery pack is connected with a third relay to form the negative end of the high-voltage power charging and discharging loop;
and the positive electrode of the low-voltage power supply battery pack is connected with the fifth relay to form the positive end of the low-voltage power supply charge-discharge loop, and the negative electrode of the low-voltage power supply battery pack is connected with the seventh relay to form the negative end of the low-voltage power supply charge-discharge loop.
4. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
a first current sensor is arranged between the negative electrode of the high-voltage power battery pack and the third relay, a second current sensor is arranged between the negative electrode of the low-voltage power battery pack and the seventh relay, and the battery management system is respectively connected with the first current sensor and the second current sensor.
5. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
and the battery management system is used for waking up the DC/DC converter when the feed of the low-voltage power supply battery pack is disconnected from the fifth relay, controlling the high-voltage power battery pack to supply power to the low-voltage power supply charge-discharge loop, and simultaneously charging the low-voltage power supply battery pack.
6. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
the battery management system includes: a high voltage circuit module and a low voltage circuit module;
the high-voltage circuit module is used for monitoring the cell state of the battery pack, and the low-voltage circuit module is used for detecting the low-voltage circuit of the battery pack and carrying out logic control on the battery pack.
7. The battery management system of claim 6, wherein,
the high-voltage circuit module further comprises an insulation detection unit, a high-voltage sampling unit and a cell balancing unit;
the low-voltage circuit module further comprises loop detection, low-voltage sampling, a communication unit, a wake-up unit, a relay control unit and a thermal management unit.
8. The battery pack as recited in any one of claims 1-7, wherein,
and each external interface of the battery pack is provided with a short circuit diagnosis module.
9. A battery pack management method, applied to the battery pack according to any one of claims 1 to 8, comprising:
and (3) discharge management:
the positive end and the negative end of the high-voltage power charging and discharging loop are connected with the positive end and the negative end of the discharging interface,
the high-voltage power charge-discharge loop is controlled to be conducted,
starting a DC/DC converter, wherein the high-voltage power battery pack supplies power to the low-voltage power supply charging and discharging loop, and simultaneously charges the low-voltage power supply battery pack;
charging management:
the positive end and the negative end of the high-voltage charge-discharge loop are connected with the positive end and the negative end of the charge interface,
the high-voltage power charge-discharge loop is controlled to be conducted,
detecting the electric quantity of a low-voltage power supply battery pack, and if the low-voltage power supply battery pack is in a full charge state, controlling a charging device to charge the high-voltage power battery pack independently; and if the low-voltage power supply battery pack is not in a full charge state, controlling the charging device to charge the high-voltage power battery pack and the low-voltage power supply battery pack simultaneously.
10. The battery pack management method of claim 9, wherein,
the charge management includes:
the positive end of the high-voltage charge-discharge loop is connected with the positive end of the charging device,
if the low-voltage power supply battery pack is in a full charge state, the battery management system controls a selection switch to be connected to the negative end of the high-voltage charge-discharge loop, and the charging device independently charges the high-voltage power battery pack;
and if the low-voltage power supply battery pack is not in a full charge state, the battery management system controls the selection switch to be connected to the negative end of the low-voltage power supply charge-discharge loop, the fourth relay is closed, and the charging device charges the high-voltage power battery pack and the low-voltage power supply battery pack simultaneously.
11. The battery pack management method of claim 9, wherein,
when the high-voltage power charging and discharging loop is not in a discharging state, if the low-voltage power supply battery pack is powered off the fifth relay, the battery management system wakes up the DC/DC converter, controls the high-voltage power battery pack to supply power to the low-voltage power supply charging and discharging loop, and simultaneously charges the low-voltage power supply battery pack.
12. The battery pack management method of claim 10, wherein,
also includes health detection and management of the battery pack,
the health detection and management of the battery pack comprises loop detection, temperature detection, low-voltage sampling, communication function, wake-up function, thermal management function, insulation detection, high-voltage sampling and cell equalization function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211593615.0A CN116001572A (en) | 2022-12-13 | 2022-12-13 | Battery pack and battery pack management method |
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| CN202211593615.0A CN116001572A (en) | 2022-12-13 | 2022-12-13 | Battery pack and battery pack management method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117465235A (en) * | 2023-12-26 | 2024-01-30 | 合众新能源汽车股份有限公司 | Battery pack, control system, vehicle and battery pack control method |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117465235A (en) * | 2023-12-26 | 2024-01-30 | 合众新能源汽车股份有限公司 | Battery pack, control system, vehicle and battery pack control method |
| CN117465235B (en) * | 2023-12-26 | 2024-03-22 | 合众新能源汽车股份有限公司 | Battery pack, control system, vehicle and battery pack control method |
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