Square battery pack

Abstract

The utility model discloses a square battery pack. The square battery pack comprises a square battery module, foam II, foam III, a screw rod, a metal plate box body, a metal plate box cover and a fan, the fan is mounted in the middle of a front panel of the sheet metal box body, the foam II is adhered to the bottom of the sheet metal box body, the square battery module is mounted in the sheet metal box body, the square battery module is fixed on the sheet metal box body through the screw rod, the foam III is adhered to the square battery module, and the sheet metal box cover is locked at the top of the sheet metal box body. The battery pack disclosed by the utility model not only can prevent electric core level heat diffusion and greatly improve the safety performance of a product, but also can carry out air-cooling large-area heat dissipation and is high in heat dissipation efficiency, meanwhile, the heat dissipation effect of the electric cores is uniform, the temperature consistency of the electric cores is high, the performance of the electric cores is improved, and the service life of the electric cores is prolonged. The battery pack disclosed by the utility model is simple in structure, low in material cost, simple in grouping process, low in grouping difficulty, high in production efficiency, low in production cost, easy to realize mass production and strong in market competitiveness.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a square battery pack. Background Art

[0002] When a single battery cell experiences thermal runaway, the explosion-proof valve on top of the cell will spray a large amount of high-temperature electrolyte. If the top of the cell is not protected, the electrolyte can corrode and melt the surface of the collection cable, or cause the two battery poles to conduct, resulting in sparks and igniting the electrolyte. This will cause the temperature inside the entire battery pack (PACK) to rise sharply again, ultimately causing other battery cells to run away. Therefore, the collection cable and battery poles need to be protected to prevent electrolyte corrosion.

[0003] Existing battery packs (PACKs) have the following defects: The battery pack (PACK) has no air-cooling heat dissipation structure: The battery will generate heat during use. Generally, the normal operating temperature range of lithium-ion batteries is below 60°C. If there is no appropriate heat dissipation structure, the battery cell will overheat, damaging the battery performance and life, and in severe cases, thermal runaway problems may occur.

[0004] The battery pack (PACK) has no anti-heat diffusion function: A key issue with current lithium-ion batteries is safety. When a battery cell experiences thermal runaway, it will quickly spread to other battery cells, causing thermal runaway of the entire module and even the entire battery system, resulting in huge losses of life and property.

[0005] Heat dissipation on non-cell large surfaces: The surface area of ​​the large surface of a square battery is much larger than that of other surfaces. If heat is not dissipated on the large surface, the heat dissipation efficiency will be low.

[0006] Inability to prevent cell-level heat spread: Preventing cell-level heat spread means that when heat spreads in one cell, it won't spread to other cells. Preventing module-level heat spread means that when heat spreads in one cell, it spreads to other cells in the same module, not to other modules. A typical square module contains anywhere from eight to a dozen cells. When a cell experiences thermal runaway, preventing module-level heat spread poses far greater risks than preventing cell-level heat spread.

[0007] Complex structure and high cost: Complex structure leads to high material costs, low production efficiency, high production costs, low yield rate, and difficulty in achieving mass production. Currently, the new energy industry is under particularly high competition pressure and has very high cost requirements. High-cost products are difficult to be competitive in the market. Utility Model Content

[0008] The purpose of the present invention is to provide a square battery pack to solve the above technical problems.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A square battery pack includes a square battery module, foam 2, foam 3, screws, a sheet metal box, a sheet metal box cover and a fan; the fan is installed in the middle of the front panel of the sheet metal box, the foam 2 is adhered to the bottom of the sheet metal box, the square battery module is inserted into the sheet metal box, the square battery module is fixed to the sheet metal box by screws, the foam 3 is adhered to the square battery module, and the sheet metal box cover is locked to the top of the sheet metal box.

[0011] The square battery module consists of a square battery cell, a mica board, an insulating sheet 1, a foam 1, an end plate, a steel strip, an insulating sheet 2, an aluminum busbar, a collection harness, and an insulating sheet 3; several foam 1s are pasted on the large surfaces of both sides of the mica board, and several foam 1s are pasted on the large surface of one side of the insulating sheet. Several square battery cells are arranged according to the actual specifications of the product, mica boards are pasted between the large surfaces of the square battery cells, and insulating sheet 1 is pasted on the large surfaces of the outer sides of the first and last square battery cells. End plates are placed at the head and tail of the module, and steel strips are used to be sleeved in the slots of the end plates to fix the module body. The hole of the insulating sheet 2 is aligned with the battery cell explosion-proof valve and pasted on the module body. After the aluminum busbar is welded to the battery cell pole through tooling, the collection harness is welded to the aluminum busbar, the hole of the insulating sheet 3 is aligned with the battery cell explosion-proof valve, the middle part is pasted on the insulating sheet 2, and the two sides are pasted on the side of the battery cell to form an exhaust channel in the middle, and the arched structures on both sides cover the battery cell pole, aluminum busbar and collection wire.

[0012] The heat dissipation ducts between the square battery cells correspond one-to-one to the air inlet positions on the side of the sheet metal box.

[0013] The insulating sheet 1, insulating sheet 2 and insulating sheet 3 are made of PC, which can be replaced by mica board, aerogel, polypropylene (MPP), epoxy board, glass fiber, asbestos, rock wool, bakelite, stone board, plastic, ceramic, foam, silicone, rubber, silicone rubber, glass, acrylic board, barley paper, red steel paper or polymer material.

[0014] The materials of foam 1, foam 2 and foam 3 are ethylene propylene diene monomer (EPDM), ethylene vinyl acetate copolymer (EVA), aerogel, polypropylene (MPP), silica gel, rubber, silicone rubber, polyurethane or polymer material.

[0015] The end plate is made of plastic, bakelite, epoxy board, ceramic, glass, aluminum and its alloy, copper and its alloy, nickel and its alloy, iron or steel.

[0016] The steel belt is made of stainless steel, fiber tape, plastic steel belt or aluminum plate.

[0017] The screw is made of carbon steel, iron or its alloy.

[0018] The sheet metal box body and the sheet metal box cover are made of galvanized steel sheet (SGCC), iron and its alloys, aluminum and its alloys, copper and its alloys, titanium and its alloys, plastic materials or polymer materials.

[0019] Square battery cells can be replaced by soft-pack battery cells, aluminum bus bars can be replaced by copper bus bars, nickel sheets or steel sheets, and collection wiring harnesses can be replaced by collection circuits such as printed circuit boards (PCBs), flexible circuit boards (FPCs), and collection integrated components (CCSs).

[0020] Compared with existing technologies, the present invention has the following advantages: The battery pack of the present invention not only prevents heat diffusion at the cell level, significantly improving product safety, but also allows for large-area air cooling (other cell surfaces can also dissipate heat), resulting in high heat dissipation efficiency. Furthermore, the cell heat dissipation effect is uniform, the cell temperature is highly consistent, and the performance and service life of the cell are improved. The battery pack of the present invention has a simple structure, low material costs, a simple assembly process, low assembly difficulty, high production efficiency, low production costs, easy mass production, and strong market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the assembly structure of the square battery module of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of the square battery module of the utility model;

[0023] Figure 3 This is a schematic diagram of the assembly structure of the utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of the utility model;

[0025] Figure 5 This is a side view of the structure of the utility model;

[0026] Figure 6 This is a schematic diagram of the top view of the structure of the utility model;

[0027] Figure 7 This is a schematic structural diagram of the square battery module box of the present utility model; DETAILED DESCRIPTION

[0028] The present invention is further described below in detail with reference to the accompanying drawings and specific embodiments. A prismatic battery pack includes a prismatic battery module 11, a second foam pad 12, a third foam pad 13, a screw 14, a sheet metal case 15, a sheet metal case cover 16, and a fan 17. The fan 17 is mounted in the middle of the front panel of the sheet metal case 15. The second foam pad 12 is attached to the bottom of the sheet metal case 15. The prismatic battery module 11 is installed in the sheet metal case 15 and secured to the sheet metal case 15 via the screw 14. The third foam pad 13 is attached to the prismatic battery module 11. The sheet metal case cover 16 is locked to the top of the sheet metal case 15.

[0029] The square battery module 11 is composed of a square battery cell 1, a mica board 2, an insulating sheet 3, a foam 4, an end plate 5, a steel belt 6, an insulating sheet 2 7, an aluminum bar 8, a collection harness 9, and an insulating sheet 3 10; a plurality of foams 4 are pasted on the large surfaces on both sides of the mica board 2, and a plurality of foams 4 are pasted on the large surface of one side of the insulating sheet 3. A plurality of square battery cells 1 are arranged according to the actual specifications of the product, a mica board 2 is pasted between the large surfaces of the square battery cells 1, and an insulating sheet 3 is pasted on the large surfaces of the outer sides of the first and last square battery cells 1. Place the end plate 5 at the tail, use the steel belt 6 to put it in the slot of the end plate 5 to fix the module body, align the hole of the second insulating sheet 7 with the explosion-proof valve of the battery cell, and stick it on the module body. After the aluminum busbar 8 is welded to the battery cell pole through the tooling, the collection harness 9 is welded to the aluminum busbar 8, and the hole of the third insulating sheet 10 is aligned with the explosion-proof valve of the battery cell. The middle part is pasted on the second insulating sheet 7, and the two sides are pasted on the side of the battery cell to form an exhaust channel in the middle. The arched structures on both sides cover the battery cell pole, aluminum busbar and collection line.

[0030] The heat dissipation air ducts between the square battery cells 1 correspond one-to-one to the positions of the air inlets on the side surfaces of the sheet metal box 15 .

[0031] The insulating sheet 1 3, insulating sheet 2 7 and insulating sheet 3 10 are made of PC, which can be replaced by mica board, aerogel, polypropylene (MPP), epoxy board, glass fiber, asbestos, rock wool, bakelite, slate, plastic, ceramic, foam, silicone, rubber, silicone rubber, glass, acrylic board, barley paper, red steel paper or polymer material.

[0032] The materials of foam 1 4, foam 2 12 and foam 3 13 are ethylene propylene diene monomer (EPDM), ethylene vinyl acetate copolymer (EVA), aerogel, polypropylene (MPP), silica gel, rubber, silicone rubber, polyurethane or polymer material.

[0033] The end plate 5 is made of plastic, bakelite, epoxy board, ceramic, glass, aluminum and its alloys, copper and its alloys, nickel and its alloys, iron or steel.

[0034] The steel belt 6 is made of stainless steel, fiber tape, plastic steel belt or aluminum plate.

[0035] The screw 14 is made of carbon steel, iron or its alloy.

[0036] The sheet metal box body 15 and the sheet metal box cover 16 are made of galvanized steel sheet (SGCC), iron and its alloys, aluminum and its alloys, copper and its alloys, titanium and its alloys, plastic materials or polymer materials.

[0037] The square battery cell 1 can be replaced by a soft-pack battery cell, the aluminum busbar 8 can be replaced by a copper busbar, a nickel sheet, or a steel sheet, and the collection harness 9 can be replaced by a collection circuit such as a printed circuit board (PCB), a flexible circuit board (FPC), or a collection integrated component (CCS).

[0038] The prismatic cell 1, due to its stable dimensions and high strength, can be arranged more efficiently, resulting in a higher module energy density when grouped. Prismatic cells can be stacked more flexibly, allowing for a wider variety of module assembly methods. Furthermore, the prismatic cell structure can better protect the internal materials and structures, thereby improving battery safety.

[0039] The mica plate 2 has good insulation performance, high temperature resistance, corrosion resistance and mechanical properties, and can effectively isolate the battery cells on both sides to prevent the thermal runaway of the battery cells from spreading.

[0040] The insulating sheet 3 is made of PC, which can protect the battery cell and avoid poor insulation or leakage between the battery cell and the end plate due to insufficient electrical clearance or creepage distance.

[0041] The foam 4 is made of ethylene propylene diene monomer (EPDM) rubber, which has good thermal insulation performance and can prevent heat transfer when the battery cell is under thermal runaway; it has high elasticity and can absorb the tolerance of parts and the tolerance generated when the modules are stacked. When the battery cell expands, it can absorb the expansion force of the battery cell and leave space for the expansion of the battery cell.

[0042] The end plate 5 is made of aluminum alloy, which offers high strength, stable dimensions, low mold and material costs, and strong compatibility. The same mold can be used for different battery cells of the same width. Aluminum alloy is highly corrosion-resistant and does not require surface coating.

[0043] The steel band 6 is made of stainless steel, which offers high strength and dimensional stability. It effectively secures the module's cells and absorbs the expansion force when the cells expand, ensuring the module's structural stability. Furthermore, stainless steel's corrosion resistance prevents module damage caused by rust and breakage of the steel band.

[0044] The insulating sheet 2 7 is made of PC, which has good insulation performance, high temperature resistance, good corrosion resistance, is easy to shape, light weight, low cost, and can effectively protect the top surface of the battery cell and enhance the insulation effect.

[0045] The aluminum busbar 8 has good electrical conductivity, is easy to process and shape, is light in weight, and has good corrosion resistance.

[0046] The collection harness 9 is used for collecting the voltage and temperature of the battery cells.

[0047] The insulating sheet 3 10 is made of PC, which has good insulation performance, strong high temperature resistance, good corrosion resistance, is easy to form, light weight, low cost, and can effectively protect the battery poles, aluminum bars and collection harnesses.

[0048] The foam 12 is made of ethylene-vinyl acetate copolymer (EVA), which has high elasticity and can absorb the tolerance between the square battery module 11 and the sheet metal box 15; it has good insulation and can protect the battery core.

[0049] The foam 13 is made of ethylene-vinyl acetate copolymer (EVA), which has high elasticity and can absorb the tolerance between the square battery module 11 and the sheet metal box cover 16, forming a support between the aluminum bar 08 and the sheet metal box cover 16 to avoid short circuit or insulation failure caused by deformation of the sheet metal box cover 16.

[0050] The screw 14 is made of carbon steel and has high structural strength, and can effectively fix the module.

[0051] The sheet metal box body 15 and the sheet metal box cover 16 are made of galvanized steel sheets (SGCC), which have high plasticity and can be easily formed into various shapes and sizes, making the manufacturing process more efficient and reducing production costs. Furthermore, galvanized steel sheets (SGCC) are highly corrosion-resistant, and in the case of non-exterior surfaces, surface treatment is not required.

[0052] There are mica boards 2 between the square battery cells 1. At the same time, strips of foam 4 are used to separate the mica boards 2 and the square battery cells 1. The mica boards 2 can effectively isolate the square battery cells 1. At the same time, the strips of foam 4 themselves can play a role in heat insulation. They can also increase the gap between the square battery cells 1 to ensure that when a square battery cell 1 has thermal runaway, it will not spread to the adjacent square battery cells 1. The foam 4 pasted on the large surfaces of the two sides of the mica board 2 and the foam 4 pasted on the large surface of one side of the insulating sheet 3 are both strips of foam, which can form air ducts on the large surfaces on both sides of the square battery cell 1 to ensure the heat dissipation efficiency of air cooling. At the same time, since the air duct spaces on both sides of each square battery cell 1 are basically the same, the module has a good temperature uniformity effect and the temperature consistency of the square battery cell 1 is high.

[0053] In the square battery module 11, the heat dissipation duct 19 between the square battery cells 1 corresponds one-to-one with the air inlet 20 on the side of the sheet metal box 15, which can ensure that the air duct is uniform and smooth. The wind enters from both sides of the sheet metal box 15, passes through the large surface of the battery cells, and gathers in the middle position of the box, and is discharged through the fan 17.

[0054] When a single battery cell experiences thermal runaway, the insulating sheet 3 10 and the foam 3 13 can protect the collection harness 10 and the battery cell poles, while forming an exhaust channel to discharge the electrolyte of the runaway battery cell to the tail of the module, and then quickly discharge it to the outside of the square battery pack through the air duct in the middle of the box.

[0055] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, based on the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, replacements and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A square battery pack, characterized in that: It includes a square battery module, foam 2, foam 3, screws, a sheet metal box, a sheet metal box cover and a fan; the fan is installed in the middle of the front panel of the sheet metal box, the foam 2 is pasted on the bottom of the sheet metal box, the square battery module is inserted into the sheet metal box, the square battery module is fixed to the sheet metal box by screws, the foam 3 is pasted on the square battery module, and the sheet metal box cover is locked on the top of the sheet metal box.

2. A square battery pack according to claim 1, characterized in that: The square battery module consists of a square battery cell, a mica board, an insulating sheet 1, a foam 1, an end plate, a steel strip, an insulating sheet 2, an aluminum busbar, a collection harness, and an insulating sheet 3; several foam 1s are pasted on the large surfaces of both sides of the mica board, and several foam 1s are pasted on the large surface of one side of the insulating sheet. Several square battery cells are arranged according to the actual specifications of the product, mica boards are pasted between the large surfaces of the square battery cells, and insulating sheet 1 is pasted on the large surfaces of the outer sides of the first and last square battery cells. End plates are placed at the head and tail of the module, and steel strips are used to be sleeved in the slots of the end plates to fix the module body. The hole of the insulating sheet 2 is aligned with the battery cell explosion-proof valve and pasted on the module body. After the aluminum busbar is welded to the battery cell pole through tooling, the collection harness is welded to the aluminum busbar, the hole of the insulating sheet 3 is aligned with the battery cell explosion-proof valve, the middle part is pasted on the insulating sheet 2, and the two sides are pasted on the side of the battery cell to form an exhaust channel in the middle, and the arched structures on both sides cover the battery cell pole, aluminum busbar and collection wire.

3. A square battery pack according to claim 2, characterized in that: The heat dissipation ducts between the square battery cells correspond one-to-one to the air inlet positions on the side of the sheet metal box.

4. The square battery pack according to claim 2, characterized in that: The insulating sheet 1, insulating sheet 2 and insulating sheet 3 are made of PC, which can be replaced by mica board, aerogel, polypropylene (MPP), epoxy board, glass fiber, asbestos, rock wool, bakelite, stone board, plastic, ceramic, foam, silicone, rubber, silicone rubber, glass, acrylic board, barley paper, red steel paper or polymer material.

5. The square battery pack according to claim 2, characterized in that: The materials of foam 1, foam 2 and foam 3 are ethylene propylene diene monomer (EPDM), ethylene vinyl acetate copolymer (EVA), aerogel, polypropylene (MPP), silica gel, rubber, silicone rubber, polyurethane or polymer material.

6. The square battery pack according to claim 2, characterized in that: The end plates are made of plastic, bakelite, epoxy board, ceramic, glass, aluminum, copper, nickel or corresponding alloys, iron or steel.

7. The square battery pack according to claim 2, characterized in that: The steel belt is made of stainless steel, fiber tape, plastic steel belt or aluminum plate.

8. The square battery pack according to claim 2, characterized in that: The screw is made of carbon steel or iron.

9. The square battery pack according to claim 2, characterized in that: The sheet metal box body and the sheet metal box cover are made of galvanized steel sheet (SGCC), iron and its alloys, aluminum and its alloys, copper and its alloys, titanium and its alloys, plastic materials or polymer materials.

10. The square battery pack according to claim 2, characterized in that: Square battery cells can be replaced by soft-pack battery cells, aluminum bus bars can be replaced by copper bus bars, nickel sheets or steel sheets, and collection harnesses can be replaced by printed circuit boards (PCBs), flexible circuit boards (FPCs), and collection integrated components (CCS) collection circuits.

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