Fuel cell power system based on lithium titanate battery
By adopting a fuel cell power system based on lithium titanate batteries in engineering vehicles, the problem of insufficient charging and discharging capacity of lithium ion batteries in the existing technology in the low temperature environment is solved, and normal charging and discharging within the range of minus 50°C to above zero and high current charging is achieved, which improves the adaptability and safety of the vehicle and reduces costs.
Patent Information
- Application Number
- CN202421932685.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The existing auxiliary energy of engineering vehicles uses ternary lithium-ion batteries or lithium iron phosphate batteries that cannot meet the working conditions, especially in low temperature environments, which leads to insufficient charging and discharging capacity, which leads to inability to exert battery capacity, which may only exert about 50% of the normal capacity, and the battery recharge capacity is limited in heavy-load downhill working conditions, resulting in limited braking capacity of pure electric vehicles and easy to experience safety accidents.
A fuel cell power system based on lithium titanate batteries is adopted, including a lithium titanate battery connected to the motor at the same time. The power battery is equipped with a power detection unit and a controller. The controller automatically matches different power supply modes according to the SOC threshold of the power battery to ensure effective power supply under different working conditions.
Lithium titanate batteries can charge and discharge normally between minus 50℃ and above 60℃. They have good low-temperature resistance and high lithium ion diffusion coefficient. They can achieve high current charging of more than 3C, shorten charging time, and have a small impact on cycle life, reducing the requirements of auxiliary batteries for the working environment, improving adaptability, avoiding the problem of low auxiliary batteries and reducing costs.
Smart Images
Figure CN222807920U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of engineering vehicle power equipment, in particular to a fuel cell power system based on a lithium titanate battery. Background Art
[0002] In the field of mining machinery, large current charging and discharging is required under conditions such as heavy-load climbing, acceleration, and heavy-load downhill, which greatly affects the life of conventional lithium batteries. In addition, the low temperature in the northwest of my country is generally below minus 10°C. The auxiliary energy of existing fuel cell electric vehicles mostly includes ternary lithium-ion batteries or lithium iron phosphate batteries. However, ternary lithium-ion batteries or lithium iron phosphate batteries have limited ability to meet the peak power requirements and emergency power requirements of the whole vehicle. General lithium batteries will have problems charging and discharging at minus 10°C, and their capacity cannot be fully utilized, which may only be about 50% of the normal capacity or even lower. Moreover, once in heavy-load downhill conditions, the battery recharging capacity is limited, resulting in the pure electric vehicle's ability to rely on motor feedback to reverse braking being limited, which is prone to safety accidents. Utility Model Content
[0003] 1. Technical problems to be solved by the utility model
[0004] The utility model aims to solve the problem that the auxiliary energy of existing engineering vehicles using ternary lithium-ion batteries or lithium iron phosphate batteries cannot meet the working condition requirements.
[0005] 2. Technical solution
[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:
[0007] The utility model discloses a fuel cell power system based on a lithium titanate battery, comprising a lithium titanate battery and a power battery connected to a motor at the same time, wherein the lithium titanate battery is connected to a fuel cell engine, and the fuel cell engine is connected to a hydrogen storage device.
[0008] Preferably, a DC / DC converter is connected between the lithium titanate battery and the fuel cell engine.
[0009] Preferably, the power battery is provided with a power detection unit, the power detection unit is connected to a controller, and the controller is connected to and controls the lithium titanate battery and the fuel cell engine.
[0010] Preferably, the controller is provided with power battery SOC thresholds A and B, A is greater than B, and when the power battery SOC is greater than threshold A, the controller controls the power battery to supply power to the motor, and controls the lithium titanate battery and the fuel cell engine to stop working.
[0011] Preferably, when the SOC of the power battery is greater than a threshold value B and less than a threshold value A, the controller controls the power battery and the lithium titanate battery to simultaneously supply power to the motor and controls the fuel cell engine to start working.
[0012] Preferably, when the power battery SOC is less than a threshold value B, the controller controls the lithium titanate battery to supply power to the motor and the power battery and controls the fuel cell engine to start working.
[0013] 3. Beneficial effects
[0014] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:
[0015] The utility model discloses a fuel cell power system based on a lithium titanate battery, comprising a lithium titanate battery and a power battery connected to a motor at the same time, wherein the lithium titanate battery is connected to a fuel cell engine, and the fuel cell engine is connected to a hydrogen storage device. By adopting a lithium titanate battery as an auxiliary battery, the low temperature resistance is good and the durability is strong. It can be normally charged and discharged at -50°C to +60°C. Moreover, lithium titanate has a high lithium ion diffusion coefficient and can realize high current charging of more than 3C. The charging time is shortened more quickly, and this fast charging has a relatively small impact on the cycle life of the lithium titanate battery. The requirements of the auxiliary battery for the working environment can be reduced, the adaptability can be improved, and the low life of the auxiliary battery caused by high-rate and high-frequency charging and discharging during operation can be effectively avoided, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The utility model is a schematic structural diagram of a fuel cell power system based on a lithium titanate battery.
[0017] Explanation of the symbols in the schematic diagram:
[0018] 100. Hydrogen storage device; 200. Fuel cell engine; 300. DC / DC converter; 400. Lithium titanate battery; 500. Motor; 600. Power battery. DETAILED DESCRIPTION
[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.
[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0021] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0022] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0023] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0025] Example 1
[0026] Refer to the attached Figure 1, a fuel cell power system based on a lithium titanate battery in this embodiment includes a lithium titanate battery 400 and a power battery 600 connected to a motor 500 at the same time, the lithium titanate battery 400 is connected to a fuel cell engine 200, and the fuel cell engine 200 is connected to a hydrogen storage device 100. In this embodiment, a lithium titanate battery 400 is used as an auxiliary battery, which has good low temperature resistance and strong durability. It can be charged and discharged normally at temperatures from -50°C to +60°C, and lithium titanate has a high lithium ion diffusion coefficient, which can achieve high current charging of more than 3C. The charging time is shortened faster, and this fast charging has a relatively small impact on the cycle life of the lithium titanate battery. The requirements of the auxiliary battery for the working environment can be reduced, the adaptability can be improved, and the low life of the auxiliary battery caused by high-rate and high-frequency charging and discharging during work can be effectively avoided, thereby reducing costs.
[0027] A DC / DC converter 300 is connected between the lithium titanate battery 400 and the fuel cell engine 200 . The DC / DC converter 300 is used to adjust the electric energy output by the fuel cell engine 200 into direct current and output it to the lithium titanate battery 400 .
[0028] The power battery 600 is provided with a power detection unit, and the power detection unit is connected to a controller, and the controller is connected to and controls the lithium titanate battery 400 and the fuel cell engine 200 .
[0029] The controller is provided with power battery 600 SOC thresholds A and B, A is greater than B. When the power battery 600 SOC is greater than threshold A, the controller controls the power battery 600 to supply power to the motor 500 and controls the lithium titanate battery 400 and the fuel cell engine 200 to stop working.
[0030] When the SOC of the power battery 600 is greater than the threshold value B and less than the threshold value A, the controller controls the power battery 600 and the lithium titanate battery 400 to simultaneously supply power to the motor 500 and controls the fuel cell engine 200 to start working.
[0031] When the SOC of the power battery 600 is less than the threshold value B, the controller controls the lithium titanate battery 400 to supply power to the motor 500 and the power battery 600 and controls the fuel cell engine 200 to start working.
[0032] The system of this embodiment can also automatically match different power supply modes according to the SOC of the power battery 600 to meet the requirements of different working conditions.
[0033] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.
Claims
1. A fuel cell power system based on a lithium titanate battery, characterized in that: It comprises a lithium titanate battery (400) and a power battery (600) which are simultaneously connected to a motor (500), wherein the lithium titanate battery (400) is connected to a fuel cell engine (200), and the fuel cell engine (200) is connected to a hydrogen storage device (100).
2. A fuel cell power system based on a lithium titanate battery according to claim 1, characterized in that: A DC / DC converter (300) is connected between the lithium titanate battery (400) and the fuel cell engine (200).
3. A fuel cell power system based on a lithium titanate battery according to claim 1, characterized in that: The power battery (600) is provided with a power detection unit, the power detection unit is connected to a controller, and the controller is connected to and controls the lithium titanate battery (400) and the fuel cell engine (200).
4. A fuel cell power system based on a lithium titanate battery according to claim 3, characterized in that: The controller is provided with power battery (600) SOC thresholds A and B, A being greater than B. When the power battery (600) SOC is greater than threshold A, the controller controls the power battery (600) to supply power to the motor (500), and controls the lithium titanate battery (400) and the fuel cell engine (200) to stop working.
5. A fuel cell power system based on a lithium titanate battery according to claim 4, characterized in that: When the SOC of the power battery (600) is greater than a threshold value B and less than a threshold value A, the controller controls the power battery (600) and the lithium titanate battery (400) to simultaneously supply power to the motor (500) and controls the fuel cell engine (200) to start working.
6. A fuel cell power system based on a lithium titanate battery according to claim 4, characterized in that: When the SOC of the power battery (600) is less than a threshold value B, the controller controls the lithium titanate battery (400) to supply power to the motor (500) and the power battery (600) and controls the fuel cell engine (200) to start working.