Lead-acid modified lithium battery PACK structure

Abstract

The utility model discloses a lead-acid-modified lithium battery PACK structure, which is characterized in that four battery cells are arranged in a male die bracket in a series-parallel connection manner, busbars are arranged on the battery cells in the series-parallel connection manner, temperature sampling lines are fixed on the side surfaces of the battery cells by using heat-conducting structural adhesive, and epoxy plates are used for fixing and insulating the periphery of a module; a liner is pasted at the bottom of a BMS to be installed above a module, the liner is fixed to the module through a fiber adhesive tape, a temperature sampling line and a voltage sampling line are installed on the BMS in a buckled mode, a positive power line of the BMS is connected with a positive busbar and a negative busbar on the module in a tin soldering mode, a foam set is pasted on the six faces of the module, and the whole module is installed in a cavity of a box body. The P + wire harness of the BMS is inserted into the P + wire harness of the box cover, the P-wire harness of the module is inserted into the P-wire harness of the box cover, and the box cover is connected with the box body in a buckling mode. According to the utility model, the safety of the battery is improved, the high-temperature performance is stable, and the reliability and safety are high.

Description

Technical Field

[0001] This utility model relates to the field of battery PACK technology, and in particular to a lead-acid modified lithium battery PACK structure. Background Technology

[0002] In the electric bicycle industry, battery technology is the core driving force. Existing technologies mainly include the following categories: lead-acid batteries, sodium-ion batteries, and solid-state batteries. Among these, lead-acid batteries benefit from policy buffers in the short term but face long-term obsolescence. Existing technologies have the following drawbacks:

[0003] 1. Lead-acid batteries cannot meet the new national standard for lightweighting, and their environmental pollution problems are prominent, leading to their gradual marginalization due to policy and technological iterations.

[0004] 2. Sodium-ion batteries currently have high manufacturing costs, and their cycle life and energy density need to be further improved to replace lead-acid batteries.

[0005] 3. Solid-state batteries have high manufacturing costs and high electrode interface impedance, requiring breakthroughs in materials and processes. Utility Model Content

[0006] The purpose of this invention is to provide a lead-acid modified lithium battery PACK structure to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A lead-acid-to-lithium battery pack structure includes a foam pack, a cover, a module, a housing, a mold support, a gasket, a battery management system (BMS), a busbar, battery cells, and an epoxy board. Four battery cells are installed in series and parallel within the mold support. The busbar is connected to the battery cells in series and parallel. Voltage sampling lines are soldered to each battery cell in series. Temperature sampling lines are fixed to the sides of the battery cells with thermally conductive adhesive. The module is secured and insulated using an epoxy board around its perimeter, with the edges of the epoxy board spliced ​​with fiber tape. A gasket is pasted to the bottom of the BMS and installed above the module, then fixed to the module with fiber tape. The temperature and voltage sampling lines are attached to the BMS using clips. The positive power line of the BMS is connected to the positive and negative busbars on the module by soldering. The foam pack is pasted on all six sides of the module. The entire module is installed inside the housing cavity. The P+ wiring harness of the module is plugged into the P+ wiring harness of the box cover, and the P- wiring harness of the module is plugged into the P- wiring harness of the box cover. The box cover and the box body are connected by a snap-fit ​​mechanism.

[0009] Preferably, the foam assembly and padding material is EVA, which provides heat insulation, cushioning, flame retardancy, sealing, support, and shock absorption.

[0010] Preferably, the lid, body, and mold support are made of mold material, which reduces the development and maintenance costs of molds, lowers module costs, and improves production efficiency.

[0011] Preferably, the busbar material is aluminum 6061, and its function is as follows: The battery connector in the battery mainly includes current conduction, stability and reliability, heat dissipation and thermal balance, and safety.

[0012] Preferably, the battery cell is a lithium iron phosphate cylindrical cell, which stores and releases electrical energy. The quality of the cell directly determines the performance of the battery, including its range, safety performance, and overall performance.

[0013] Preferably, the epoxy board is made of FR4, which has the characteristics of fireproofing, flame retardancy, insulation, and high temperature resistance. It also serves as insulation protection and short circuit prevention, ensuring that the circuit remains open.

[0014] Compared with the prior art, the present invention has the following advantages: The battery PACK of the present invention uses lithium iron phosphate cells to replace the original lead-acid batteries. The design of the busbar and epoxy board materials improves the battery's safety (it does not catch fire after puncture test), ensures stable high-temperature performance, and has high reliability and safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the battery PACK assembly structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the module stacking structure of this utility model;

[0017] In the diagram: 1. Foam assembly; 2. Box cover; 3. Module; 4. Box body; 5. Mold support; 6. Gasket; 7. BMS; 8. Busbar; 9. Battery cell; 10. Epoxy board. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] A lead-acid-to-lithium battery pack structure includes a foam pack 1, a cover 2, a module 3, a housing 4, a mold support 5, a gasket 6, a battery management system (BMS) 7, a busbar 8, battery cells 9, and an epoxy board 10. Four battery cells 9 are installed in series and parallel within the mold support 5. The busbar 8 is connected to the battery cells 9 in series and parallel. Voltage sampling lines are soldered to each battery cell 9. Temperature sampling lines are fixed to the sides of the battery cells 9 using thermally conductive adhesive. The epoxy board 10 is used to fix and insulate the module 3 around its perimeter. The edges of the epoxy board 10 are spliced ​​with fiber tape. The gasket 6 is pasted to the bottom of the BMS 7 and installed above the module 3, then fixed to the module 3 with fiber tape. The temperature and voltage sampling lines are attached to the BMS 7 using clips. The built-in positive power line of BMS 7 is connected to the positive and negative busbars on module 3 by soldering. The foam assembly 1 is pasted on the six sides of module 3. The entire module 3 is installed in the cavity of the housing 4. The P+ harness of BMS 7 is plugged into the P+ harness of housing cover 2, and the P- harness of module 3 is plugged into the P- harness of housing cover 2. Housing cover 2 and housing 4 are connected by a snap-fit ​​mechanism.

[0020] The foam assembly 1 and the padding 6 are made of EVA, which provides heat insulation, cushioning, flame retardancy, sealing, support and shock absorption.

[0021] The lid 2, body 4, and mold support 5 are made of mold material, which reduces the development and maintenance costs of molds, lowers module costs, and improves production efficiency.

[0022] The busbar 8 is made of aluminum 6061. Its function is mainly to conduct current, ensure stability and reliability, dissipate heat and maintain thermal balance, and ensure safety.

[0023] The battery cell 9 is a lithium iron phosphate cylindrical cell, which stores and releases electrical energy. The quality of the cell directly determines the performance of the battery, including its range, safety performance, and overall performance.

[0024] The epoxy board 10 is made of FR4 material, which has the characteristics of fire resistance, flame retardancy, insulation, and high temperature resistance. It also provides insulation protection and short-circuit protection, ensuring the circuit remains open.

[0025] The module stacking of this utility model is as follows: Figure 2 As shown:

[0026] Four battery cells 9 are installed into the mold bracket 5 in a series-parallel configuration. They are then placed in a spot welding fixture for fixation. Busbars 8 are installed onto the battery cells 9 in a series-parallel configuration. The entire fixture is then placed into a laser welding machine for welding. The fixing fixture is removed, and the voltage acquisition lines are soldered to each battery cell. The temperature sampling lines are fixed to the sides of the battery cells with thermally conductive adhesive. Epoxy boards are used to fix and insulate the module, with the edges of the epoxy boards spliced ​​with fiber tape. A pad 6 is pasted onto the bottom of the BMS 7 and installed above the module, then fixed to the module with fiber tape. The temperature and voltage sampling lines are first installed onto the BMS using clips. The positive power line of the BMS 7 is connected to the positive and negative busbars on the module 3 by soldering.

[0027] The battery pack assembly of this utility model is as follows: Figure 1 As shown:

[0028] Attach foam assembly 1 to the six sides of module 3, then assemble the entire module into the cavity of housing 4. Connect the P+ wiring harness of BMS 7 to the P+ wiring harness of housing cover 2, and connect the P- wiring harness of the module to the P- wiring harness of housing cover 2. After testing whether there is voltage output at the two poles of housing cover, tidy up the internal wiring harness, and then connect housing cover 2 to housing 4 using a snap-fit ​​connection.

[0029] The above description is a preferred embodiment of the present utility model. For those skilled in the art, any changes, modifications, substitutions and variations made to the implementation methods without departing from the principles and spirit of the present utility model, based on the teachings of the present utility model, still fall within the protection scope of the present utility model.

Claims

1. A lead-acid modified lithium battery PACK structure, characterized in that, The foam group, the box cover, the module, the box, the male die support, the gasket, the BMS, the bus bar, the battery cell, and the epoxy plate are included. Four battery cells are installed in the male die support in a series-parallel manner. The bus bar is installed on the battery cells in a series-parallel manner. The voltage collection line is welded on each series of battery cells in a soldering manner. The temperature sampling line is fixed on the side of the battery cell by using a heat-conducting structural adhesive. The epoxy plate is used to fix and insulate the module around the module. The edge of the epoxy plate is spliced by using a fiber tape. The gasket is pasted on the bottom of the BMS and installed above the module. The module is fixed by using the fiber tape. The temperature sampling line and the voltage sampling line are installed on the BMS in a buckle form. The positive power line of the BMS is connected with the positive and negative bus bars of the module by soldering. The foam group is pasted on the six surfaces of the module. The whole module is installed in the cavity of the box. The P+ wire harness of the BMS is plugged into the P+ wire harness of the box cover. The P- wire harness of the module is plugged into the P- wire harness of the box cover. The box cover and the box are connected in a buckle form.

2. A lead-acid modified lithium battery PACK structure according to claim 1, characterized in that, The foam group and the gasket are made of EVA.

3. A lead-acid modified lithium battery PACK structure according to claim 1, characterized in that, The box cover, the box, and the male die support are made of the male die.

4. A lead-acid modified lithium battery PACK structure according to claim 1, characterized in that, The bus bar is made of aluminum 6061.

5. A lead-acid lithium-modified battery PACK structure according to claim 1, characterized in that, The battery cell is a lithium iron phosphate cylindrical battery cell.

6. A lead-acid lithium-modified battery PACK structure according to claim 1, characterized in that, The epoxy plate is made of FR4.

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