A series-parallel type battery pack online remote charging and discharging device
By designing an online remote charging and discharging device of a series-parallel battery pack, the heat generation and voltage protection problems during the core capacity of the battery pack in the prior art are solved, and the online core capacity and triple protection functions are realized, which improves the energy saving and environmental protection and stability of the system.
Patent Information
- Application Number
- CN202421314038.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-11
AI Technical Summary
When the existing battery pack core capacity is used, the battery pack exits the busbar and adds false load discharge. The core pack process will generate a lot of heat, which is not energy-saving and environmentally friendly, and the AC power loss during the core pack process or the battery is open to multiple protection of the DC bus voltage.
A series-parallel battery pack online remote charging and discharging device is designed, including a battery pack, a series-parallel battery pack online far-high and low voltage cross-border charging and discharging device and a battery control module. The device is composed of four bidirectional DC/DC conversion modules, battery pack inspection instruments and battery management units. It has high and low voltage crossing functions, realizes the online battery core capacity and provides triple protection functions.
The battery's online core capacitance function is realized, and it is suitable for DC systems such as 1 charge 1, 2 charge 2 charge 2 and 3 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2 charge 2
Smart Images
Figure CN222735845U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery charging and discharging devices, in particular to an online remote charging and discharging device for a series-parallel type battery pack. Background Art
[0002] After the battery is discharged, direct current is passed through the battery in the opposite direction of the discharge current to restore its working capacity. This process is called battery charging. When charging the battery, the positive electrode of the battery is connected to the positive electrode of the power supply, and the negative electrode of the battery is connected to the negative electrode of the power supply. The charging power supply voltage must be higher than the total electromotive force of the battery.
[0003] At present, when the battery pack is recharged, the battery pack is withdrawn from the bus and a dummy load is added to discharge. The recharge process will generate a lot of heat, which is not energy-saving and environmentally friendly. In addition, the DC bus voltage cannot be protected in multiple ways when the AC power is lost or the battery is open during the recharge process. Therefore, we propose an online remote charging and discharging device for series-parallel battery packs to solve the above problems. Utility Model Content
[0004] The purpose of the utility model is to provide an online remote charging and discharging device for a series-parallel type battery pack, so as to solve the problem in the above-mentioned background technology that when the existing battery pack is capped, the battery pack withdraws from the bus and increases the dummy load discharge, a large amount of heat is generated during the capping process, which is not energy-saving and environmentally friendly, and the DC bus voltage cannot be protected multiple times when the AC power is lost or the battery is open during the capping process.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an online remote charging and discharging device for a series-parallel type battery pack, comprising a battery pack, an online remote high and low voltage ride-through charging and discharging device for a series-parallel type battery pack and a battery control module, wherein the battery pack is provided with four batteries;
[0006] It is characterized by: also including:
[0007] A charging circuit is arranged at the input end of the battery pack, and the series-parallel type battery pack has a high and low voltage ride-through function in the online high and low voltage ride-through process charging and discharging device;
[0008] The online high and low voltage ride-through charging and discharging device of the series-parallel type battery pack is composed of four bidirectional DC / DC conversion modules, a battery pack inspection meter and a battery management unit, and the four bidirectional DC / DC conversion modules are respectively connected to four batteries, and the four batteries are connected in series. The online high and low voltage ride-through charging and discharging device of the series-parallel type battery pack is connected in parallel to the battery pack.
[0009] Preferably, a battery monitoring unit is installed on the outer wall of the battery pack, and a single-chip microcomputer chip, a wireless data transmission module and a gyroscope are arranged inside the battery monitoring unit. The output end of the single-chip microcomputer chip inside the battery monitoring unit is connected to the input end of the battery control module through the wireless data transmission module, and the output end of the gyroscope is electrically connected to the input end of the single-chip microcomputer chip.
[0010] Preferably, the output end of the gyroscope inside the battery monitoring unit is electrically connected to the input end of the single-chip microcomputer chip.
[0011] Preferably, a patch-type temperature sensor probe is arranged above the battery monitoring unit, and the output end of the patch-type temperature sensor probe is electrically connected to the input end of the single-chip microcomputer chip inside the battery monitoring unit.
[0012] Preferably, a humidity sensor is provided below the battery monitoring unit, and an output end of the humidity sensor is electrically connected to an input end of a single-chip microcomputer chip inside the battery monitoring unit.
[0013] Preferably, a power supply circuit is provided on the output end of the battery pack, a current transformer is installed on the power supply circuit, and the output end of the current transformer is electrically connected to the input end of the battery control module.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The utility model is provided with a series-parallel type battery pack online high and low voltage ride-through charging and discharging device. Compared with the traditional DC power supply, it has the function of online battery capacity verification, and is suitable for DC systems such as 1 charge 1 power, 2 charge 2 power and 3 charge 2 power, with high flexibility;
[0016] At the same time, it provides triple protection functions for the DC bus. First, it can monitor the battery discharge capacity online, and judge the battery discharge capacity according to the battery voltage change during short-term high-current charging and discharging to ensure that it is in a healthy state. Second, when the former fails and only a few batteries fail, the fault-free battery can automatically supply power to the bus through the online high and low voltage ride-through charging and discharging device of the series-parallel battery group to avoid affecting the continuity of the bus power supply. Third, when the former and the latter fail, the high and low voltage ride-through function charging module can maintain the minimum short-term power for the tripping and switching of the relay protection when the grid voltage drops to the minimum threshold of the rated voltage.
[0017] The invention solves the problem that when the existing battery pack is overloaded, the battery pack is withdrawn from the bus and a dummy load is added for discharge, a large amount of heat is generated in the overload process, which is not energy-saving and environmentally friendly, and the DC bus voltage cannot be protected in multiple ways when the AC power is lost or the battery is open during the overload process.
[0018] 2. By equipping each battery in the battery pack with an independent battery monitoring unit, which integrates a gyroscope and temperature and humidity detection probes, the operating temperature, status and environmental factors of each battery in the battery pack can be independently monitored, and the data can be fed back to the battery control module, which is convenient for timely feedback and adjustment when an abnormality is detected, ensuring the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0020] Figure 2 This is a schematic diagram of the battery structure of the utility model;
[0021] Figure 3 It is a schematic diagram of the online high and low voltage ride-through charging and discharging device of the series-parallel type storage battery pack of the utility model;
[0022] In the figure: 1. Battery pack; 2. Battery; 3. Power supply line; 4. Charging line; 5. Bidirectional DC / DC conversion module; 6. Current transformer; 7. Online high and low voltage ride-through charging and discharging device for series-parallel battery pack; 8. Battery control module; 9. Battery monitoring unit; 10. SMD temperature sensor probe; 11. Humidity sensor; 12. Battery pack inspection instrument; 13. Battery management unit. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0024] See also Figure 1-3 The utility model provides an embodiment: an online remote charging and discharging device for a series-parallel type battery pack, comprising a battery pack 1, an online remote high and low voltage ride-through charging and discharging device 7 for a series-parallel type battery pack, and a battery control module 8. A battery 2 is arranged inside the battery pack 1, and the battery 2 is provided with four batteries;
[0025] It is characterized by: also including:
[0026] The charging circuit 4 is arranged at the input end of the battery pack 1, and the series-parallel type battery pack has a high and low voltage ride-through function in the online high and low voltage ride-through process of the charging and discharging device 7;
[0027] The online high and low voltage ride-through charging and discharging device 7 for series-parallel type battery packs is composed of four bidirectional DC / DC conversion modules 14, a battery pack inspection meter 12 and a battery management unit 13, and the four bidirectional DC / DC conversion modules 14 are respectively connected to four batteries 2, and the four batteries 2 are connected in series. The online high and low voltage ride-through charging and discharging device 7 for series-parallel type battery packs is connected in parallel to the battery pack 1.
[0028] See also Figure 1 and Figure 2 A battery monitoring unit 9 is installed on the outer wall of the battery pack 1. A single-chip microcomputer chip, a wireless data transmission module and a gyroscope are arranged inside the battery monitoring unit 9. The output end of the single-chip microcomputer chip inside the battery monitoring unit 9 is connected to the input end of the battery control module 8 through the wireless data transmission module, and the output end of the gyroscope is electrically connected to the input end of the single-chip microcomputer chip. The battery monitoring unit 9 can independently monitor the operating temperature, status and environmental factors of each battery 2 in the battery pack 1, and feed back the data to the battery control module 8, so as to facilitate timely feedback and adjustment when an abnormality is detected.
[0029] Furthermore, the output end of the gyroscope inside the battery monitoring unit 9 is electrically connected to the input end of the single-chip microcomputer chip. The gyroscope can detect the balance state of the battery 2. When the battery 2 is tilted or offset due to external force, the gyroscope can detect it in time and feedback the signal to the single-chip microcomputer chip.
[0030] See also Figure 2 A patch temperature sensor probe 10 is arranged above the battery monitoring unit 9, and the output end of the patch temperature sensor probe 10 is electrically connected to the input end of the single-chip microcomputer chip inside the battery monitoring unit 9. The patch temperature sensor probe 10 can monitor the shell temperature of the battery 2 in real time and feed back the detection result to the single-chip microcomputer chip. When the detected temperature reaches the temperature threshold, the single-chip microcomputer chip can further feed back a signal to the battery control module 8 to issue an alarm reminder.
[0031] See also Figure 2 A humidity sensor 11 is provided below the battery monitoring unit 9, and the output end of the humidity sensor 11 is electrically connected to the input end of the single-chip microcomputer chip inside the battery monitoring unit 9. The humidity sensor 11 can detect the humidity state at the bottom of the battery 2. When it is detected that the bottom layer encounters water, it will promptly feedback a signal to the single-chip microcomputer chip.
[0032] See also Figure 1 A power supply line 3 is provided on the output end of the battery pack 1 , a current transformer 6 is installed on the power supply line 3 , and the output end of the current transformer 6 is electrically connected to the input end of the battery control module 8 .
[0033] Working principle: When in use, the normally closed contact of the contactor connected in parallel with the diode in the online remote capacity-reducing system of the battery can be disconnected according to the cycle set by the battery management unit 13, and any two-way DC / DC conversion module 14 can be started to discharge to the load. After the discharge is completed, the battery 2 needs to be fully charged, and then another two-way DC / DC conversion module 14 is started, so as to realize the online automatic capacity-reducing of the battery 2 group by controlling the discharge and charging of the two-way DC / DC conversion module 14. The normal operation of the DC power supply system is not affected during the capacity-reducing process. The four batteries 2 can be grouped and the capacity is taken turns in sequence to ensure that the capacity of the battery 2 at any time is not less than 75% of the rated capacity of the whole group of batteries 2, which solves the technical problem of high operation and maintenance costs of conventional manual capacity-reducing.
[0034] In addition, the battery online remote capacity verification system can start short-term discharge and charging of each battery group through the battery management unit 13, and accurately judge the discharge capacity of the battery group 1 according to the charge and discharge curve of the battery 2 and in combination with the battery online group capacity verification, so as to ensure that the battery group 1 can normally supply power to the DC bus in the event of a power grid accident;
[0035] Each battery 2 group supplies power to the DC bus through the corresponding bidirectional DC / DC conversion module 14. Since there are four groups of batteries 2, four channels for supplying power to the DC bus are added. When a fault occurs in an individual battery 2 group, the battery 2 without fault can automatically supply power to the DC bus through the bidirectional DC / DC conversion module 14 to ensure stability.
[0036] Each battery 2 in the battery pack 1 is equipped with an independent battery monitoring unit 9. The battery monitoring unit 9 integrates a gyroscope and a temperature and humidity detection probe, which can independently monitor the operating temperature, status and environmental factors of each battery 2 in the battery pack 1, and feed back the data to the battery control module 8, so as to facilitate timely feedback and adjustment when an abnormality is detected, thereby ensuring the safety of battery use.
[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. An online remote charging and discharging device for a series-parallel type storage battery pack, comprising a storage battery pack (1), an online remote high and low voltage ride-through charging and discharging device (7) for a series-parallel type storage battery pack, and a storage battery control module (8), wherein a storage battery (2) is arranged inside the storage battery pack (1), and four storage batteries (2) are arranged; Features: Also includes: A charging circuit (4) is arranged at the input end of the battery pack (1), and the series-parallel type battery pack has a high and low voltage ride-through function in the online high and low voltage ride-through process charging and discharging device (7); The series-parallel type battery pack online high and low voltage ride-through process charging and discharging device (7) is composed of four bidirectional DC / DC conversion modules (14), a battery pack inspection instrument (12) and a battery management unit (13), and the four bidirectional DC / DC conversion modules (14) are respectively connected to four batteries (2), the four batteries (2) are connected in series, and the series-parallel type battery pack online high and low voltage ride-through process charging and discharging device (7) is connected in parallel to the battery pack (1).
2. The online remote charging and discharging device for series-parallel type storage battery pack according to claim 1, characterized in that: A battery monitoring unit (9) is installed on the outer wall of the battery pack (1), and a single-chip microcomputer chip, a wireless data transmission module and a gyroscope are arranged inside the battery monitoring unit (9). The output end of the single-chip microcomputer chip inside the battery monitoring unit (9) is connected to the input end of the battery control module (8) through the wireless data transmission module, and the output end of the gyroscope is electrically connected to the input end of the single-chip microcomputer chip.
3. The online remote charging and discharging device for series-parallel type storage battery pack according to claim 2, characterized in that: The output end of the gyroscope inside the battery monitoring unit (9) is electrically connected to the input end of the single-chip microcomputer chip.
4. The online remote charging and discharging device for series-parallel type storage battery pack according to claim 2, characterized in that: A patch-type temperature sensing probe (10) is arranged above the battery monitoring unit (9), and the output end of the patch-type temperature sensing probe (10) is electrically connected to the input end of the single-chip microcomputer chip inside the battery monitoring unit (9).
5. The online remote charging and discharging device for series-parallel type storage battery pack according to claim 2, characterized in that: A humidity sensor (11) is provided below the battery monitoring unit (9), and an output end of the humidity sensor (11) is electrically connected to an input end of a single-chip microcomputer chip inside the battery monitoring unit (9).
6. The online remote charging and discharging device for series-parallel type storage battery pack according to claim 1, characterized in that: A power supply line (3) is provided at the output end of the battery pack (1), a current transformer (6) is installed on the power supply line (3), and the output end of the current transformer (6) is electrically connected to the input end of the battery control module (8).