A new energy battery pack with lithium battery starting battery

Abstract

The utility model discloses a new energy is from lithium electricity starting battery's battery package, including protection structure and integrated type battery management system, the protection structure is by aluminum alloy frame and composite material shell constitutes, aluminum alloy frame is sealed with composite material shell, the inside of protection structure is divided into lithium electricity starting battery area and power battery area, lithium electricity starting battery area is equipped with four lithium electricity starting battery module that is composed of lithium iron phosphate battery, and lithium electricity starting battery module both ends are equipped with copper tab, power battery area is equipped with the power battery module that is composed of twenty -four lithium iron phosphate battery, and the battery is through aluminum palladium electrical connection, integrated type battery management system is equipped with control circuit board.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle battery technology, specifically a battery pack for new energy vehicles with built-in lithium-ion starting batteries. Background Technology

[0002] Currently, in the field of new energy vehicles, the power supply system generally adopts a solution of independently setting up a starter battery and a power battery. Among them, the starter battery mostly uses traditional lead-acid batteries, while the power battery is mostly a lithium-ion battery. Lead-acid starter batteries have dominated the market for a long time due to their relatively mature technology and low initial cost.

[0003] However, this traditional battery configuration has many drawbacks. In terms of performance, lead-acid starting batteries have low energy density, typically only 30-50Wh / kg, resulting in greater weight, increased vehicle load, and reduced overall driving range. Their cycle life is short, usually only 300-500 charge-discharge cycles, and frequent replacements not only increase user costs but also cause maintenance inconvenience. From an environmental perspective, lead-acid batteries contain lead, sulfuric acid, and other substances that, if not properly handled during production, use, and disposal, can cause serious pollution to soil, water sources, and other ecological environments.

[0004] From a vehicle design perspective, the separate layout of the starter battery and the power battery occupies a large amount of interior space, which is not conducive to the lightweight and integrated design of the vehicle. Furthermore, the two battery systems need to be equipped with wiring harnesses, management modules, etc., which increases the overall vehicle manufacturing cost and circuit complexity, increases the probability of failure, and makes it difficult to meet the needs of new energy vehicles to develop towards high integration and intelligence.

[0005] Therefore, a new type of battery pack with an integrated lithium-ion starting battery is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a battery pack for new energy sources with built-in lithium-ion starting batteries, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] 1. A battery pack for a new energy source with an integrated lithium-ion starting battery, comprising a protective structure and an integrated battery management system;

[0009] The protective structure consists of an aluminum alloy frame and a composite material shell;

[0010] The aluminum alloy frame is sealed to the composite material shell;

[0011] The protective structure is internally divided into a lithium-ion starter battery area and a power battery area.

[0012] The lithium battery starting battery area is provided with four lithium battery starting battery modules composed of lithium iron phosphate cells, and copper tabs are installed at both ends of the lithium battery starting battery modules.

[0013] The power battery area is equipped with a power battery module consisting of twenty-four lithium iron phosphate batteries, and the batteries are electrically connected to each other via aluminum palladium.

[0014] The integrated battery management system is equipped with a control circuit board.

[0015] Furthermore, the four corners of the aluminum alloy frame are reinforced by welding.

[0016] Furthermore, the composite material shell is a glass fiber reinforced epoxy resin composite material.

[0017] Furthermore, the aluminum alloy frame and composite material shell are sealed with sealing strips.

[0018] Furthermore, the interior of the protective structure is divided into a lithium-ion battery starting area and a power battery area by an insulating partition.

[0019] Furthermore, the lithium iron phosphate cells are connected in series, and both the lithium-ion starter battery module and the power battery module are equipped with independent temperature sensors and voltage acquisition lines.

[0020] Furthermore, the control circuit board is mounted in a slot on one side of the aluminum alloy frame.

[0021] Furthermore, the control circuit board is connected to the temperature sensors and voltage acquisition lines of the lithium-ion starter battery module and the power battery module via a low-voltage control harness, and to the lithium iron phosphate cells, lithium iron phosphate batteries and the vehicle electrical system via a high-voltage harness.

[0022] Furthermore, the energy density of the lithium iron phosphate battery cell is 150-190Wh / kg.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This battery pack innovatively replaces the starting battery material with lithium iron phosphate. Traditional lead-acid starting batteries suffer from low energy density, short lifespan, and high pollution due to material limitations, while other lithium battery materials may have shortcomings in terms of safety and cost. Using lithium iron phosphate as the starting battery material fundamentally changes the performance of starting batteries. On the one hand, its high energy density and long cycle life effectively solve the problems of poor range and frequent replacement of lead-acid batteries; on the other hand, its excellent thermal stability and environmentally friendly characteristics not only improve battery safety but also align with the current trend of green manufacturing. Compared with other lithium battery materials, it has a greater overall performance advantage, providing a superior solution for starting batteries in new energy vehicles.

[0025] The starting battery is located inside the battery pack, enhancing battery protection: This invention breaks with the traditional independent placement of the starting battery, placing it inside the overall battery pack. The battery pack as a whole adopts a high-strength aluminum alloy frame and composite material shell, achieving an IP67 protection rating. Compared with the traditional independently placed starting battery, it provides more comprehensive and reliable protection for the starting battery. Whether facing external impacts, compression, or water and dust intrusion, it can effectively protect the starting battery. At the same time, the heat-insulating partitions and integrated heat dissipation and thermal management system inside the battery pack can create a stable working environment for the starting battery, reduce the impact of external environmental factors on the starting battery performance, extend its service life, and further improve the reliability and stability of the new energy vehicle battery system.

[0026] The battery pack is equipped with an integrated battery management system (BMS), which can simultaneously monitor and manage both the starter battery and the power battery. The BMS collects parameters such as voltage, current, and temperature from each module of the starter battery and power battery to achieve real-time monitoring of the battery status.

[0027] When the vehicle starts, the BMS controls the starter battery to provide a large current to the starter motor to ensure that the vehicle starts smoothly. During normal driving, the BMS automatically coordinates the use of the vehicle's regenerative braking system or power battery pack to charge the starter battery according to the charge status of the starter battery, so as to achieve efficient use of energy. When the power battery is low, the BMS can control the starter battery to provide a certain amount of emergency power support to the power battery, provided that safety permits, to ensure that the vehicle can drive to a safe area.

[0028] Furthermore, the starting battery and the power battery inside the battery pack are electrically connected via high-voltage wiring harnesses and low-voltage control wiring harnesses. These harnesses are shielded and equipped with overcurrent protection and short-circuit protection devices to ensure the safety and reliability of the electrical connection. This also simplifies the wiring harness layout inside the vehicle, reduces the number and length of wiring harnesses, and lowers the probability of circuit failures.

[0029] The starting battery is located inside the battery pack, near the edge of the housing, and is placed at the bottom of the vehicle. It dissipates the heat generated by the battery during use through natural cooling.

[0030] The BMS monitors the battery temperature in real time and activates the heating film located at the bottom of the battery. In low-temperature environments, the thermal management system can use the electric heating film to preheat the battery, ensuring that the battery can operate normally at low temperatures and improving the battery's environmental adaptability. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] Example 1:

[0034] Please see Figure 1 This utility model provides a technical solution:

[0035] A new energy battery pack with a built-in lithium-ion starting battery includes a protective structure and an integrated battery management system. The protective structure is composed of an aluminum alloy frame and a composite material shell. The aluminum alloy frame 1 serves as the main support structure, and its four corners are reinforced by welding. The frame is wrapped with a glass fiber reinforced epoxy resin composite material shell with fireproof, heat insulation and insulation properties. The shell and the frame are sealed with a sealing strip 2 to make the battery pack reach the IP67 protection level.

[0036] The battery pack is divided into a lithium-ion starting battery area and a power battery area by an insulating partition 3. The lithium-ion starting battery area contains multiple modules composed of lithium iron phosphate cells 4. Each module contains 4 cells, which are connected in series by laser welding. Copper tabs 5 are provided at both ends of the module for electrical connection. Each module is also equipped with an independent temperature sensor and voltage acquisition line for real-time monitoring of cell status. The power battery area consists of multiple ternary lithium batteries or lithium iron phosphate batteries 6 forming power battery modules. Each module is also equipped with an independent temperature sensor and voltage acquisition line. The modules are electrically connected by aluminum palladium 7 and are fastened to the module tabs with bolts and coated with conductive paste to enhance conductivity.

[0037] The battery pack is equipped with an integrated battery management system (BMS). Its control circuit board 8 is installed in a dedicated slot on one side of the battery pack. The BMS is connected to the temperature sensors and voltage acquisition lines of the lithium-ion starter battery module and the power battery module through a low-voltage control harness to realize real-time monitoring of the battery status. At the same time, it is connected to the lithium iron phosphate cell 4, the lithium iron phosphate battery 6 and the vehicle's electrical system through a high-voltage harness to control the charging and discharging process of the battery.

[0038] Operating principle:

[0039] High-strength aluminum alloy sheets with a tensile strength of not less than 235MPa are purchased to make aluminum alloy frame 1. Composite materials with fireproof, heat insulation and insulation properties, such as glass fiber reinforced epoxy resin composite material, are selected to make the outer shell.

[0040] The positive electrode material of the starter battery cell is high-purity lithium iron phosphate, and the negative electrode material is artificial graphite; the power battery cell can be either ternary lithium battery or lithium iron phosphate battery according to the vehicle's performance requirements. At the same time, suitable electrolytes, separators and other materials are purchased to ensure battery performance.

[0041] Aluminum alloy sheets are processed into aluminum alloy frames 1 through processes such as cutting, bending, and welding to ensure the dimensional accuracy and structural strength of the frames. The surface of the frames is anodized to improve their corrosion resistance.

[0042] The composite material is made into a composite shell by compression molding process, and then assembled by bonding, bolting and other methods to ensure the shell's airtightness and mechanical strength.

[0043] Inside the battery pack frame, brackets and insulating partitions 3 are installed to fix the battery modules. The partitions are made of heat-insulating and insulating materials, such as phenolic resin boards, in accordance with design requirements, and it is ensured that they are installed firmly and reliably.

[0044] The positive electrode, negative electrode and separator are wound or stacked according to process requirements to make lithium iron phosphate cell 4. The four cells are connected in series to form a battery module. Laser welding technology is used to connect the cell tabs 5 and the connecting piece to ensure welding quality. Temperature sensor and voltage acquisition line are installed in the module and insulated. The assembled starter battery module is tested for voltage, internal resistance, capacity and other performance, and qualified modules are selected.

[0045] Following a similar process to that used for the starter battery module, the power battery module is assembled using lithium iron phosphate battery 6. According to the vehicle's power requirements, multiple power battery modules are connected in series or parallel and electrically connected through aluminum palladium 7 to ensure a firm connection and good contact. Temperature sensors, current sensors, and other detection components are installed inside the power battery module and insulated and protected. The assembled power battery module is then subjected to performance testing and screening.

[0046] Connect the high-voltage wiring harness and low-voltage control wiring harness between the starter battery module and the power battery module to ensure correct and reliable connection. Install the battery management system (BMS) in the designated location inside the battery pack and connect the BMS to each battery module, sensor, and vehicle electrical system. Insulate and protect all electrical connection parts to ensure electrical safety.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery pack for a new energy source with an integrated lithium-ion starting battery, characterized in that, This includes a protective structure and an integrated battery management system; The protective structure consists of an aluminum alloy frame (1) and a composite material shell; The aluminum alloy frame (1) is sealed to the composite material shell; The protective structure is internally divided into a lithium-ion starter battery area and a power battery area. The lithium battery starting battery area is provided with four lithium battery starting battery modules composed of lithium iron phosphate cells (4), and copper tabs (5) are installed at both ends of the lithium battery starting battery modules. The power battery area is provided with a power battery module consisting of twenty-four lithium iron phosphate batteries (6), and the batteries are electrically connected to each other through aluminum palladium (7); The integrated battery management system is equipped with a control circuit board (8).

2. The battery pack with a built-in lithium-ion starting battery as described in claim 1, characterized in that: The aluminum alloy frame (1) is reinforced by welding at its four corners.

3. The battery pack with a built-in lithium-ion starting battery as described in claim 1, characterized in that: The composite material shell is a glass fiber reinforced epoxy resin composite material.

4. The battery pack with a built-in lithium-ion starting battery as described in claim 1, characterized in that: The aluminum alloy frame (1) and the composite material shell are sealed by a sealing strip (2).

5. A battery pack with an integrated lithium-ion starting battery as described in claim 1, characterized in that: The protective structure is divided into a lithium-ion battery area and a power battery area by an insulating partition (3).

6. A battery pack with an integrated lithium-ion starting battery as described in claim 1, characterized in that: The lithium iron phosphate cells (4) are connected in series, and the lithium battery starting battery module and the power battery module are each equipped with an independent temperature sensor and voltage acquisition line.

7. A battery pack with an integrated lithium-ion starting battery as described in claim 1, characterized in that: The control circuit board (8) is installed in a slot on one side of the aluminum alloy frame (1).

8. A battery pack with an integrated lithium-ion starting battery as described in claim 1, characterized in that: The control circuit board (8) is connected to the temperature sensor and voltage acquisition line of the lithium battery starting battery module and the power battery module through a low-voltage control harness, and is connected to the lithium iron phosphate cell (4), the lithium iron phosphate battery (6) and the vehicle electrical system through a high-voltage harness.

9. A battery pack with an integrated lithium-ion starting battery as described in claim 1, characterized in that: The energy density of the lithium iron phosphate cell (4) is 150-190Wh / kg.

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