A liquid lithium-ion pole piece battery pack and its application

Abstract

The present invention discloses a liquid lithium-ion pole piece battery pack and its application. The battery pack includes a filled sealed packaging shell, a multifunctional voltage collection harness, an insulating anti-seepage membrane and a plurality of pole piece capacity units; the capacity unit negative pole ear of a pole piece capacity unit is connected to the capacity unit positive pole ear of the previous or next pole piece capacity unit to form a positive and negative connected series structure; a multifunctional voltage collection harness is connected to the capacity unit positive pole ear or the capacity unit negative pole ear between two adjacent pole piece capacity units; an insulating anti-seepage membrane is arranged between two adjacent pole piece capacity units, thereby separating each pole piece capacity unit separately to form an independent unit; after electrolyte injection and formation, the outer periphery and internal gap of the battery pack are filled with sealing materials to form a filled sealed packaging shell. Through the structural design of the battery pack, the de-cellization and de-modularization of the liquid lithium-ion pole piece battery pack are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a liquid lithium-ion pole piece battery pack and applications thereof. Background Art

[0002] With the promotion and application of new energy vehicles and 5G technology, the smart society has entered people's daily life. The demand for off-grid energy storage power sources is increasing and the quality requirements are getting higher and higher. As an energy storage device, the safety, service life and life cycle cost of batteries have attracted much attention. The problems exposed by liquid lithium-ion batteries, such as leakage, fire, attenuation, low energy density and high cost, have become important bottlenecks in their application.

[0003] The ultimate application of battery products, especially power supply and energy storage power supply, is battery pack. Traditional battery packs have many components, high material and energy consumption, low energy density and power density, poor consistency of single cells, short cycle life, complicated preparation process, low production efficiency and high manufacturing cost. Therefore, the technical threshold for its production and preparation is high, which is not conducive to industrial promotion. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a liquid lithium-ion electrode battery pack and its application.

[0005] The technical solution of the present invention to solve the technical problem of the battery pack is to provide a liquid lithium-ion pole piece battery pack, characterized in that the battery pack includes a filled sealed packaging shell, a multifunctional voltage collection harness, an insulating anti-seepage membrane and a plurality of pole piece capacity units;

[0006] The negative pole ear of a pole capacity unit is connected to the positive pole ear of the previous or next pole capacity unit, and then all pole capacity units are connected end to end in sequence to form a positive and negative series structure; the positive pole ear of the first pole capacity unit leads to the total positive terminal of the battery pack; the negative pole ear of the last pole capacity unit leads to the total negative terminal of the battery pack; a multifunctional voltage collection harness is connected to the positive pole ear or the negative pole ear of the capacity unit between two adjacent pole capacity units; the positive pole ear of the first pole capacity unit is connected to a multifunctional voltage collection harness. A multifunctional voltage collection harness is provided, and the negative pole ear of the capacity unit of the last pole piece capacity unit is connected to a multifunctional voltage collection harness; an insulating anti-seepage membrane is arranged between two adjacent pole piece capacity units, so as to separate each pole piece capacity unit separately to form an independent unit; after the electrolyte is injected and formed, the outer periphery and the internal gap of the battery pack are filled with sealing materials to form a filled-in sealed packaging shell, and at the same time, the battery pack total positive terminal, the battery pack total negative terminal and all the external terminals of the multifunctional voltage collection harness are reserved on the outside of the filled-in sealed packaging shell.

[0007] The technical solution of the present invention to solve the above-mentioned application technical problem is to provide an application of a liquid lithium-ion pole piece battery pack, which is characterized in that the liquid lithium-ion pole piece battery pack is connected to an electrical appliance and a battery management system to form a charge-discharge energy storage power supply.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] (1) The present invention realizes the de-cellization and de-moduleization of the liquid lithium-ion electrode battery pack through the structural design of the battery pack. The auxiliary raw materials and accessories of the battery pack are greatly reduced, and only the necessary components are retained, thereby improving the energy density and power density of the battery pack.

[0010] (2) Through the structural design of the electrode capacity unit, the current battery pack preparation method is simplified, the process route is shortened, the preparation of the battery pack is easier to control, and the consistency between the single cells is better.

[0011] (3) Through the structural design of the filled sealed packaging shell and the insulating anti-seepage membrane, not only the electrolyte environment between the pole piece capacity units is isolated, but also the thermal runaway caused by heat accumulation between the pole piece capacity units is effectively prevented, thereby improving the safety performance of the battery.

[0012] (4) The present invention directly assembles the positive and negative electrode sheets of the battery into a liquid lithium ion pole piece battery pack (LITHIUM IONBATTERY POLE PIECE to PACK, abbreviated as LIB PTP), reducing the manufacturing process by 50%, reducing the manufacturing cost by 30%, increasing the energy density by 80%, and reducing the investment density of the annual output of each kilowatt-hour battery pack by 30%. It solves the problems of the liquid lithium ion pole piece battery pack in the prior art, such as long process route, complex process, large consumption of auxiliary raw materials and battery pack accessories, low energy density, and short cycle life. It has the significant advantages of fewer components, low material consumption, high energy density, high power density, long cycle life, high production efficiency, and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0014] Figure 2 The figure is a schematic structural diagram of a stacking unit according to an embodiment of the present invention.

[0015] In the figure: 1. total positive terminal of battery pack; 2. total negative terminal of battery pack; 3. filled sealed packaging shell; 4. pole piece capacity unit; 5. multi-function voltage collection harness; 6. capacity unit positive ear; 7. capacity unit negative ear; 8. insulating anti-seepage membrane; 41. pole piece positive ear; 42. positive pole piece; 43. isolation membrane; 44. negative pole piece; 45. pole piece negative ear. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the claims of this application.

[0017] The present invention provides a liquid lithium ion electrode battery pack (referred to as battery pack, see Figure 1-2 ), characterized in that the battery pack comprises a filled sealed packaging shell 3, a multifunctional voltage collection harness 5, an insulating anti-seepage membrane 8 and a plurality of pole piece capacity units 4;

[0018] The capacity unit negative pole ear 7 of a pole piece capacity unit 4 is connected to the capacity unit positive pole ear 6 of the previous or next pole piece capacity unit 4 through an ultrasonic welding process, and then all the pole piece capacity units 4 are connected end to end one by one in sequence to form a positive and negative connected series structure, thereby improving the output voltage level of the battery pack; the capacity unit positive pole ear 6 of the first pole piece capacity unit 4 leads to the total positive terminal 1 of the battery pack; the capacity unit negative pole ear 7 of the last pole piece capacity unit 4 leads to the total negative terminal 2 of the battery pack; a multifunctional voltage collection harness 5 is connected to the capacity unit positive pole ear 6 or the capacity unit negative pole ear 7 between two adjacent pole piece capacity units 4 through an ultrasonic welding process; the capacity unit positive pole ear 6 of the first pole piece capacity unit 4 is connected to a multifunctional voltage collection harness 5 through an ultrasonic welding process, and the capacity unit negative pole ear 7 of the last pole piece capacity unit 4 is connected to a multifunctional voltage collection harness 5 through an ultrasonic welding process; an insulating anti-seepage membrane 8 is arranged between two adjacent pole piece capacity units 4, thereby connecting each pole piece The capacity unit 4 is separated separately to form an independent insulating unit to ensure that the electrolyte of each pole piece capacity unit 4 is not interconnected; then dried, injected with electrolyte and formed in a closed protective gas environment with controllable environmental conditions such as temperature and air pressure (preferably, the battery pack is first clamped to fix the position of the battery pack, and then dried, injected with electrolyte, clamped and formed in a closed protective gas environment with controllable environmental conditions such as temperature and air pressure), and then the outer periphery and internal gap of the battery pack are filled with sealing materials by injection molding solidification, foaming solidification or liquid injection solidification to form a filled sealed packaging shell 3, which completely seals the outer periphery of the battery pack and fills all the remaining space inside the battery pack to isolate the battery pack from the external environment and fix the components of the battery pack; at the same time, the total positive terminal 1 of the battery pack, the total negative terminal 2 of the battery pack and all the multi-functional voltage collection harnesses 5 are positioned through the filled sealed packaging shell 3 and external terminals are reserved on the outside of the filled sealed packaging shell 3.

[0019] The number of the pole piece capacity units 4 in the series structure is determined according to the total voltage requirement of the battery pack.

[0020] The filling and sealing material is made of insulating, heat-resistant, weather-resistant, solvent-resistant and flame-retardant polymer materials such as PP, PE, PU, ​​ABS or epoxy resin.

[0021] The multifunctional voltage collection harness 5 is used to collect the real-time voltage of the electrode capacity unit 4, and monitor the voltage level changes of each electrode capacity unit 4 in real time during the formation and use of the battery pack to prevent the battery pack from being overcharged or over-discharged; at the same time, the multifunctional voltage collection harness 5 can be connected in parallel with an external circuit to realize the control of the voltage size of a specific electrode capacity unit 4 during the charging and discharging process.

[0022] The insulating anti-seepage film 8 can be made of PE, PET, PP, epoxy resin or mica sheet, with a thickness of 0.1mm to 3mm.

[0023] Preferably, each pole piece capacity unit 4 has the same capacity and is composed of a number of stacked units connected in parallel; the parallel connection of the stacked units allows the voltage level to be maintained and the capacity of the battery pack to be increased, thereby achieving high current discharge;

[0024] The stacking unit is formed by cutting and stacking a plurality of positive plates 42, a plurality of negative plates 44 and a plurality of separators 43, and a layer of separator 43 is bonded between each group of positive plates 42 and negative plates 44; the end of the positive plate 42 is the positive pole ear 41, and the end of the negative plate 44 is the negative pole ear 45; the positive pole ears 41 of all stacking units of each pole capacity unit 4 are connected to form a positive pole ear 6 of a capacity unit through an ultrasonic welding process, and all negative pole ears 45 of each pole capacity unit 4 are connected to form a negative pole ear 7 of a capacity unit through an ultrasonic welding process. Preferably, the capacity of each stacking unit is the same. The number of poles is determined according to the capacity requirement of the pole capacity unit 4.

[0025] Preferably, the positive electrode ear 41 of the electrode piece can be made of aluminum foil, microporous aluminum foil or aluminum mesh; the positive electrode piece 42 can be made of lithium cobalt oxide, lithium manganese oxide, ternary lithium or lithium iron phosphate positive electrode piece; the isolation membrane 43 can be made of lithium ion permeable electronic insulating microporous membranes such as PP, PE or PET; the negative electrode piece 44 can be made of artificial graphite, natural graphite, mesophase carbon microspheres, silicon-carbon composite materials or lithium titanate negative electrode piece; the negative electrode ear 45 of the electrode piece can be optionally made of copper foil, microporous copper foil or copper mesh.

[0026] In the formation process, after draining the excess electrolyte, the total positive terminal 1 (or positive bus) of the battery pack, the total negative terminal 2 (or negative bus) of the battery pack and the external terminal of the multifunctional voltage acquisition harness 5 are connected to the activation device in a closed protective gas environment with controllable environmental conditions such as temperature and air pressure (heating and pressurizing conditions in this embodiment) for high-voltage constant current and constant voltage segmented charge and discharge activation; the activation conditions are: activation DC voltage 5V~1000V (preferably 5V~750V), temperature 30~65℃ (preferably 45℃~60℃), air pressure 150kpa~250kpa; the activation device can use an automatically adjustable constant current and constant voltage DC power supply.

[0027] After the battery pack is manufactured, welding fixtures are respectively connected to the total positive electrode terminal 1 of the battery pack and the total negative electrode terminal 2 of the battery pack to connect the positive bus and the negative bus respectively.

[0028] The present invention also provides an application of a liquid lithium-ion pole piece battery pack, which is characterized in that the liquid lithium-ion pole piece battery pack can be made into a charge-discharge energy storage power supply after being connected to an electrical appliance and a battery management system HBMS.

[0029] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A liquid lithium-ion pole piece battery pack, characterized in that The battery pack includes a filled sealed packaging shell, a multifunctional voltage collection harness, an insulating anti-seepage membrane and a plurality of pole piece capacity units; The negative electrode ear of a pole piece capacity unit is connected to the positive electrode ear of the previous or next pole piece capacity unit, and then all the pole piece capacity units are connected end to end in sequence to form a series structure with positive and negative connections; the positive electrode ear of the capacity unit of the first pole piece capacity unit leads to the total positive terminal of the battery pack; the negative electrode ear of the capacity unit of the last pole piece capacity unit leads to the total negative terminal of the battery pack; a multifunctional voltage collection harness is connected to the positive electrode ear or the negative electrode ear of the capacity unit between two adjacent pole piece capacity units; the positive electrode ear of the capacity unit of the first pole piece capacity unit is connected to a multifunctional voltage collection harness, and finally The negative pole ear of a pole piece capacity unit is connected to a multi-functional voltage collection harness; an insulating anti-seepage membrane is arranged between two adjacent pole piece capacity units, thereby isolating each pole piece capacity unit individually to form an independent insulating unit, thereby ensuring that the electrolyte of each pole piece capacity unit does not communicate with each other; after the electrolyte is injected and formed, the outer periphery and internal gap of the battery pack are filled with sealing materials to form a filled-in sealed packaging shell, and at the same time, the battery pack total positive terminal, the battery pack total negative terminal and all the external terminals of the multi-functional voltage collection harness are reserved on the outside of the filled-in sealed packaging shell.

2. The liquid lithium-ion electrode battery pack according to claim 1, characterized in that Filling-type hermetic packaging is achieved by filling the sealing material by injection molding, foaming or liquid injection.

3. The liquid lithium-ion electrode battery pack according to claim 1 or 2, characterized in that The filling and sealing material is made of a high polymer material that is insulating, heat-resistant, weather-resistant, solvent-resistant and flame-retardant.

4. The liquid lithium-ion electrode battery pack according to claim 3, characterized in that The filling and sealing material is PP, PE, PU, ​​ABS or epoxy resin.

5. The liquid lithium-ion electrode battery pack according to claim 1, characterized in that The insulating anti-seepage film is made of PE, PET, PP, epoxy resin or mica sheet, and has a thickness of 0.1 mm to 3 mm.

6. The liquid lithium-ion electrode battery pack according to claim 1, characterized in that Each pole piece capacity unit has the same capacity and is composed of several stacked units connected in parallel.

7. The liquid lithium-ion electrode battery pack according to claim 6, characterized in that Each stacking unit has the same capacity.

8. The liquid lithium-ion electrode battery pack according to claim 6 or 7, characterized in that The stacking unit is formed by cutting and stacking a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of isolation films, and a layer of isolation film is arranged between each group of positive electrode sheets and negative electrode sheets; the end of the positive electrode sheet is the electrode sheet positive ear, and the end of the negative electrode sheet is the electrode sheet negative ear; the electrode sheet positive ears of all stacking units of each electrode sheet capacity unit are connected to form a capacity unit positive ear, and all electrode sheet negative ears of each electrode sheet capacity unit are connected to form a capacity unit negative ear.

9. The liquid lithium-ion electrode battery pack according to claim 8, characterized in that The positive electrode ear of the electrode piece is made of aluminum foil, microporous aluminum foil or aluminum mesh; the positive electrode piece is made of lithium cobalt oxide, lithium manganese oxide, ternary lithium or lithium iron phosphate positive electrode piece; the isolation membrane is made of PP, PE or PET lithium ion transparent electronic insulating microporous film; the negative electrode piece is made of artificial graphite, natural graphite, mesophase carbon microspheres, silicon-carbon composite material or lithium titanate negative electrode piece; the negative electrode ear of the electrode piece can be made of copper foil, microporous copper foil or copper mesh film.

10. Application of a liquid lithium-ion electrode battery pack, characterized in that The liquid lithium-ion electrode battery pack described in any one of claims 1 to 9 is connected to an electrical appliance and a battery management system to produce a charge-discharge energy storage power supply.

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