CN219191980U - Battery system for mixed use of lead acid and lithium battery - Google Patents
Battery system for mixed use of lead acid and lithium battery Download PDFInfo
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- CN219191980U CN219191980U CN202223035178.9U CN202223035178U CN219191980U CN 219191980 U CN219191980 U CN 219191980U CN 202223035178 U CN202223035178 U CN 202223035178U CN 219191980 U CN219191980 U CN 219191980U
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- battery
- lithium battery
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- lead acid
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to a battery system that lead acid and lithium electricity used in mixture, including lithium cell, lead acid battery, BMS control module and load, wherein lead acid battery is connected with the lithium cell, and the lithium cell is connected with the load, and when discharging, the lithium cell is the load power supply, and lead acid battery charges for the lithium cell simultaneously. The battery system has the advantages of both a lithium battery and a lead-acid battery, and reduces the cost of the battery system while ensuring the performance of the battery.
Description
Technical Field
The utility model relates to the field of batteries used for electric forklifts, in particular to a battery system for mixed use of lead acid and lithium battery.
Background
The battery used by the existing electric forklift is mainly a lead-acid battery or a lithium battery, and the lead-acid battery has the defects of lower price, low energy density, low rate discharge, slow charge and the like; the lithium battery has the advantages of higher energy density, high rate discharge, quick charge and the like, but has higher relative price. There is currently no battery system on the market for electric forklifts that is relatively a compromise in price and performance.
Disclosure of Invention
In order to solve the above problems, an object of the present utility model is to provide a battery system in which lead acid and lithium battery are used in combination, which can achieve both advantages.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the battery system comprises a lithium battery, a lead-acid battery, a BMS control module and a load, wherein the lead-acid battery is connected with the lithium battery, the lithium battery is connected with the load, and when discharging, the lithium battery supplies power for the load, and meanwhile, the lead-acid battery charges the lithium battery.
Preferably, the lithium battery and the lead-acid battery are connected through a DC-DC conversion circuit, and the DC-DC conversion circuit is used for boosting the voltage from the lead-acid battery to the lithium battery in a unidirectional way.
Preferably, the lithium battery charging device comprises a charger, wherein the charger is connected with the lithium battery and the lead-acid battery simultaneously, and the charger comprises a voltage adjusting module for adjusting charging voltage.
As an alternative, the battery pack comprises a switch selection module, wherein the switch selection module comprises a first switch connected with a lithium battery and a second switch connected with a lead-acid battery, a load is connected with the switch selection module, and the BMS module controls the on-off of the first switch and/or the second switch.
As an alternative, the battery pack comprises a switch selection module, wherein the switch selection module comprises a first switch connected with a lithium battery and a second switch connected with a lead-acid battery, a load and a charger are connected with the switch selection module, and the BMS module controls the on-off of the first switch and/or the second switch.
By adopting the technical scheme, the battery system simultaneously comprises lead acid and a lithium battery, the lithium battery is used for supplying power to a load during discharging, and the battery system has high energy density and high multiplying power discharging. The lead-acid battery charges the lithium battery while the lithium battery supplies power for the load, so that the whole battery system has larger electric capacity, and meanwhile, compared with a battery system completely composed of the lithium battery, the cost can be reduced. Therefore, the battery system can have the advantages of a lithium battery and a lead-acid battery, and the cost of the battery system is reduced while the performance of the battery is ensured.
Drawings
Fig. 1 is a schematic circuit structure of the present utility model.
Reference numerals: 1 lithium battery, DC-DC converting circuit 2, lead-acid battery 3, switch selection module 4, charger 5, load 6, BMS control module 7.
Detailed Description
Embodiments of the present utility model are described in detail below.
As shown in fig. 1, the present embodiment provides a battery system in which lead acid and a lithium battery 1 are mixed for use, including the lithium battery 1, a lead-acid battery 3, a BMS control module 7 and a load 6, wherein the lead-acid battery 3 is connected with the lithium battery 1, the lithium battery 1 is connected with the load 6, and when discharging, the lithium battery 1 supplies power to the load 6, and meanwhile, the lead-acid battery 3 charges the lithium battery 1. Since a voltage difference exists between the lithium battery 1 and the lead-acid battery 3, the working voltage of the lithium battery 1 is higher than that of the lead-acid battery 3, and the lithium battery 1 and the lead-acid battery 3 are connected through the DC-DC conversion circuit 2, and the DC-DC conversion circuit 2 is used for boosting the voltage unidirectionally from the lead-acid battery 3 to the lithium battery 1. In the embodiment, the lithium battery 1 supplies power for the load 6, and the lead-acid battery 3 supplies power for the lithium battery 1, so that the advantage of high rate discharge of the lithium battery 1 can be taken into account, the cruising ability of the whole battery system is ensured, and meanwhile, the cost is lower than that of a battery system adopting the all-lithium battery 1.
The battery system further comprises a switch selection module 4, and the lithium battery 1 and the lead-acid battery 3 are connected through the switch selection module 4. The switch selection module 4 comprises a first switch connected with the lithium battery 1 and a second switch connected with the lead-acid battery 3, and the on-off of the first switch and/or the second switch is controlled by the BMS control module 7. The BMS control module 7 is a battery management system, and belongs to the prior art, and its specific structure and operation principle are not described here. The switch selection module 4 is arranged to realize that only one battery anode and cathode charging port is provided outside the battery system, and the on-off selection of the lithium battery 1 or the lead-acid battery 3 can be performed inside the battery.
The load 6 and the charger 5 are respectively connected with the switch selection module 4. The battery system is connected with a charger 5 through a switch selection module 4 to realize system charging or is connected with a load 6 to realize system discharging; when discharging, the BMS controls the switch selection module 4 to only connect the lithium battery 1 with the external load 6, and controls the DC-DC to charge the lead-acid battery 3 to the lithium battery 1 while discharging, so as to realize energy transfer discharging of the lead-acid battery 3 to the lithium battery 1; when charging, the BMS firstly controls the switch selection module 4 to simultaneously connect the lithium battery 1 and the lead-acid battery 3 with the charger 5, simultaneously controls the charger 5 to output larger charging current, and after the lithium battery 1 is fully charged, disconnects the lithium battery 1 and the charger 5, simultaneously controls the charger 5 to reduce the current to continuously charge the lead-acid battery 3 until reaching the set cut-off charging voltage of the lead-acid battery 3, and stops charging.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.
Claims (5)
1. The battery system is characterized by comprising a lithium battery, a lead-acid battery, a BMS control module and a load, wherein the lead-acid battery is connected with the lithium battery, the lithium battery is connected with the load, and when the lithium battery discharges, the lithium battery supplies power for the load, and meanwhile, the lead-acid battery charges the lithium battery.
2. The battery system for mixed use of lead acid and lithium battery according to claim 1, wherein the lithium battery and the lead acid battery are connected by a DC-DC conversion circuit, and the DC-DC conversion circuit is used for unidirectional boosting from the lead acid battery to the lithium battery.
3. The battery system for mixed use of lead acid and lithium battery according to claim 2, comprising a charger connected to both the lithium battery and the lead acid battery, the charger comprising a voltage regulation module for regulating the charging voltage.
4. A battery system for mixed use of lead acid and lithium battery according to claim 1 or 2, comprising a switch selection module, wherein the switch selection module comprises a first switch connected with the lithium battery and a second switch connected with the lead acid battery, a load is connected with the switch selection module, and the BMS module controls the on-off of the first switch and/or the second switch.
5. A battery system for mixed use of lead acid and lithium battery according to claim 3, comprising a switch selection module, wherein the switch selection module comprises a first switch connected with the lithium battery and a second switch connected with the lead acid battery, and the load and the charger are connected with the switch selection module, and the BMS module controls the on-off of the first switch and/or the second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223035178.9U CN219191980U (en) | 2022-11-14 | 2022-11-14 | Battery system for mixed use of lead acid and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223035178.9U CN219191980U (en) | 2022-11-14 | 2022-11-14 | Battery system for mixed use of lead acid and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219191980U true CN219191980U (en) | 2023-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223035178.9U Active CN219191980U (en) | 2022-11-14 | 2022-11-14 | Battery system for mixed use of lead acid and lithium battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN219191980U (en) |
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2022
- 2022-11-14 CN CN202223035178.9U patent/CN219191980U/en active Active
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