WO2021244595A1

WO2021244595A1 - Liquid lithium-ion electrode sheet battery pack, preparation method therefor, and application thereof

Info

Publication number: WO2021244595A1
Application number: PCT/CN2021/098050
Authority: WO
Inventors: 张聪聪; 王卫润东
Original assignee: 极安新能源科技（上海）有限公司
Priority date: 2020-06-04
Filing date: 2021-06-03
Publication date: 2021-12-09

Abstract

Disclosed are a liquid lithium-ion electrode sheet battery pack, a preparation method therefor, and the application thereof. The battery pack comprises a filling-type sealed encapsulation shell, insulating impermeable membranes, and electrode sheet capacity units, wherein a capacity unit negative electrode tab of one electrode sheet capacity unit is connected to a capacity unit positive electrode tab of the previous or the next electrode sheet capacity unit in sequence end-to-end to form a series-connected structure with positive electrodes being connected to negative electrodes; one insulating impermeable membrane is provided between two adjacent electrode sheet capacity units so as to separate the electrode sheet capacity units; and the battery pack is encapsulated in a filling-type sealed manner. The preparation method comprises: preparing electrode sheet capacity units; preparing a lithium-ion electrode sheet battery pack to be activated by liquid injection; injecting a lithium-ion electrolyte; activating; and sealing, filling and fixing after activating. According to the present application, with the structural design of the battery pack, the battery pack is free of a cell and a module; in addition, the series connection of the battery pack in the same environment is achieved, thereby improving the consistency of single cells to improve the performance of the battery pack.

Description

Liquid lithium ion pole piece battery pack, preparation method and application thereof

Technical field

This application relates to the technical field of lithium batteries, in particular to a liquid lithium ion pole piece battery pack, a preparation method and an application thereof.

Background technique

With the popularization and application of new energy vehicles and 5G technology, the intelligent society has entered the people's daily life, and 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, batteries have attracted much attention for their safety, service life, and lifetime cost. The leakage, fire, attenuation, low energy density, and high cost of liquid lithium-ion batteries have all become important bottlenecks in their applications.

The ultimate application of battery products, especially power sources and energy storage power sources, is battery packs. The preparation of traditional battery packs requires the production of single cells first. The single cells are injected, sealed, formed, packaged, aging, separated, and sorted. Then the single cells are assembled in series and parallel into modules, and then the molds Assemble into a finished battery pack (English CELL to MODULE to PACK, abbreviated as CTMTP; CELL to PACK, abbreviated as CTP). The manufacturing process is not only cumbersome, but also leads to poor consistency of the finished battery, and a large number of connectors are required in the process of forming modules and packages, resulting in traditional battery packs with many components, high material and energy consumption, energy density and power. Low density, poor consistency of single cells, short cycle life, complicated and cumbersome preparation process, low production efficiency, high manufacturing cost and other shortcomings, so the technical threshold of its production and preparation is high, which is not conducive to industrialization.

Summary of the invention

In view of the above-mentioned shortcomings or deficiencies of the prior art, the technical problem to be solved by this application is to provide a liquid lithium ion pole piece battery pack, a preparation method and an application thereof.

In order to solve the above technical problems, this application implements the following technical solutions:

On the one hand, the present application proposes a liquid lithium-ion pole piece battery pack, which includes a filling type airtight packaging shell, an insulating impermeable film, and a number of pole piece capacity units;

The negative ear of the capacity unit of one pole piece capacity unit is connected to the positive ear of the capacity unit of the next or next pole piece capacity unit, and then all the pole piece capacity units are connected end to end in turn to form a series structure of positive and negative connections;

The positive ear of the capacity unit of the first pole piece capacity unit leads to the total positive terminal of the battery pack; the negative ear of the capacity unit of the last pole piece capacity unit leads to the total negative terminal of the battery pack;

An insulating and anti-seepage film is arranged between two adjacent pole piece capacity units, and each pole piece capacity unit is separately separated to form an independent unit;

The outer periphery and inner gap of the battery pack are filled and sealed to form a filled sealed packaging shell. At the same time, the external terminals of the battery pack's total positive terminal and the battery pack's total negative terminal are reserved on the outside of the filled sealed packaging shell.

Optionally, it further includes: a plurality of multifunctional voltage collection wiring harnesses, one of the multifunctional voltage collection wiring harnesses is connected to the positive ear of the capacity unit or the negative ear of the capacity unit between two adjacent pole piece capacity units; The positive ear of the capacity unit of the sheet capacity unit is connected to one of the multifunctional voltage collection wiring harnesses, and the negative ear of the capacity unit of the last pole piece capacity unit is connected to the one of the multifunctional voltage collection wires.

Optionally, an external terminal of the multifunctional voltage collection harness is reserved on the outer side of the filling type airtight packaging shell.

Optionally, the filling type airtight packaging is performed on the outer periphery and the inner space of the battery pack by filling a sealing material to form the filling type airtight packaging shell.

Optionally, the filling and sealing material adopts an insulating, heat-resistant, weather-resistant, solvent-resistant and flame-retardant polymer material;

And/or, the insulating and impermeable film is made of PE, PET, PP, epoxy resin or mica sheet, with a thickness of 0.1 mm to 3 mm.

Optionally, the filling and sealing material is PP, PE, PU, ABS or epoxy resin.

Optionally, the filling type airtight package is realized by filling the sealing material by injection molding solidification, foaming solidification, or liquid injection solidification.

Optionally, each of the pole piece capacity units has the same capacity and is composed of several stacking units in parallel.

Optionally, the capacity of each stacking unit is the same.

Optionally, the stacking unit includes: a number of positive plates, a number of negative plates, and a number of isolation films, and a layer of isolation film is provided between each group of the positive plates and the negative plates;

The end of the positive electrode piece is a positive electrode lug of the electrode piece, and the end of the negative electrode piece is a negative electrode lug of the electrode piece;

The positive ears of the pole pieces of all the stacking units of each of the pole piece capacity units are connected to form a positive ear of the capacity unit, and all the negative ears of the pole pieces of each of the pole piece capacity units are connected to form a negative ear of the capacity unit.

Optionally, the anode lug of the pole piece is made of aluminum foil, microporous aluminum foil or aluminum mesh;

And/or, the positive electrode plate adopts lithium cobalt oxide, lithium manganate, ternary lithium or lithium iron phosphate positive electrode;

And/or, the isolation membrane adopts PP, PE or PET lithium ion permeable electronic insulating microporous membrane;

And/or, the negative electrode sheet adopts artificial graphite, natural graphite, mesocarbon microspheres, silicon-carbon composite material or lithium titanate negative electrode sheet;

And/or, copper foil, microporous copper foil or copper mesh film can be used for the negative electrode ear of the pole piece.

On the other hand, this application also proposes a method for preparing a liquid lithium-ion pole piece battery pack, which includes:

Preparation of pole piece capacity unit;

Preparation of a lithium-ion pole piece battery pack to be activated by liquid injection;

Refill: Connect the battery pack's total positive terminal to the positive bus, and the battery pack's total negative terminal to the negative bus; then lead the external terminals of the positive bus and the negative bus to a closed environment with controllable temperature and air pressure; Then seal and pass in protective gas to form a closed protective gas environment with controllable temperature and pressure conditions, and inject liquid into it;

Activation: Drain the excess electrolyte, connect the external terminals of the positive bus and negative bus to the activation device, and activate in a closed protective gas environment with controllable temperature and pressure conditions;

After activation, the filling type airtight packaging is used to form a filled airtight packaging shell that seals all the outer periphery of the battery pack and fills all the remaining space inside the battery pack to realize the isolation of the battery pack from the external environment and the fixation of the battery pack components. The liquid lithium ion pole piece battery pack is obtained.

Optionally, in the above-mentioned external terminal of the positive bus and negative bus leading to a closed environment with controllable temperature and air pressure, it also includes: then leading the external terminal of the multifunctional voltage collection harness to lead to the temperature and air pressure Outside the confined environment with controllable conditions;

And/or, in the above-mentioned draining excess electrolyte and connecting the external terminals of the positive bus and the negative bus to the activation device, it also includes: connecting the external terminals of the multifunctional voltage acquisition harness to the activation device.

Optionally, before the electrolyte is injected, the above-mentioned lithium-ion pole piece battery pack to be activated by the liquid injection is clamped in a sealed environment with controllable temperature and pressure conditions, so that the lithium-ion pole piece battery pack to be activated by the liquid injection The position of the battery pack is fixed; connect the battery pack's total positive terminal to the positive bus, and the battery pack's total negative terminal to the negative bus; then connect the multi-function voltage acquisition harness, the positive bus and the external terminal of the negative bus to lead to temperature and air pressure conditions. It can be sealed outside; then sealed and passed protective gas to form a closed protective gas environment with controllable temperature and pressure conditions, and dried in it;

And/or, after draining the excess electrolyte, you need to clamp the battery pack, connect the multi-function voltage acquisition harness, the positive bus and the external terminal of the negative bus to the activation device; in a heated and pressurized airtight protective gas environment Carry out high-voltage constant current and constant voltage segmented charge and discharge activation in a high-voltage environment.

Optionally, the aforementioned activation conditions are: an activation DC voltage of 5V to 1000V, a temperature of 30 to 65°C, and an air pressure of 150kpa to 250kpa; the activation device adopts an automatically adjustable constant current and constant voltage DC power supply.

Optionally, first perform a semi-filled airtight package on the above-mentioned lithium-ion pole piece battery pack to be activated by liquid injection; the semi-filled airtight package is: in the four surfaces perpendicular to the insulating impermeable membrane, there is no positive electrode of the capacity unit At least one of the two sides of the ear and the negative ear of the capacity unit is not filled and sealed for electrolyte immersion; at the same time, the total positive terminal of the battery pack, the total negative terminal of the battery pack and the multi-function voltage collection harness pass The airtight encapsulation surface realizes positioning, and external terminals are reserved on the outside of the airtight encapsulation surface.

Optionally, when a semi-filled hermetic package is used, it is only necessary to perform a filled hermetic package on the surface where the filled hermetic package is not carried out, and then combine with the semi-filled hermetic package to form a filled hermetic package shell; when the semi-filled hermetic package is not used In a type airtight packaging, the outer periphery of the battery pack is hermetically sealed and filled with all the remaining space inside the battery pack through a filled airtight packaging to form a filled airtight packaging shell. At the same time, the battery pack's total positive terminal and battery pack's total negative terminal are connected. And the multi-function voltage acquisition wiring harness realizes the positioning through the filled airtight packaging shell, and reserves the external terminal on the outside of the filled airtight packaging shell.

On the other hand, this application also proposes an application of a liquid lithium-ion pole piece battery pack. After the above-mentioned liquid lithium-ion pole piece battery pack is connected to an electrical appliance and a battery management system, a charge and discharge energy storage power source is made.

Compared with the prior art, this application has the following technical effects:

Through the structural design of the battery pack, this application realizes the de-celling and de-modularization of the liquid lithium-ion pole piece battery pack; the auxiliary raw materials and accessories of the battery pack are greatly reduced, and only the necessary components are retained, which improves the battery pack Energy density and power density;

This application not only completes the isolation of the electrolyte environment between the pole piece capacity units, but also effectively prevents the heat accumulation between the pole piece capacity units resulting from the heat build-up through the structural design of the filled airtight packaging shell and the insulating impermeable membrane. Out of control, improving the safety performance of the battery;

Through the structural design of the pole piece capacity unit, the present application simplifies the current preparation method of the battery pack, shortens the process route, makes the preparation of the battery pack easier to be controlled, and the consistency between the single cells is better;

The improvement of the traditional technology in this application realizes the de-celling and de-modularization of the liquid lithium-ion pole piece battery pack, and improves the energy density and power density;

Compared with the cumbersome traditional process route, this application simplifies the traditional battery pack manufacturing process into stacking, welding, liquid injection, activation, and packaging, shortens the process route, increases the production capacity, and makes the preparation of the battery pack easier to be controlled and realized at the same time The whole battery pack is formed in series in the same environment, which improves the consistency between the single cells and improves the performance of the battery pack;

This application directly assembles the positive and negative electrodes of the battery into a liquid lithium ion electrode pack (LITHIUM IONBATTERY POLE PIECE to PACK, abbreviated as LIB PTP), which reduces the manufacturing process by 50%, reduces the manufacturing cost by 30%, and increases the energy density by 80%. The investment density of the battery pack per kWh per year is reduced by 30%, which solves the problem of the long process route, complex procedures, high consumption of auxiliary raw materials and battery pack accessories, low energy density, and long cycle of the liquid lithium-ion pole piece battery pack in the prior art. The problem of short life span 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.

Description of the drawings

By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes, and advantages of the present application will become more apparent:

Figure 1: An internal schematic diagram of the overall structure of an embodiment of the present application;

Fig. 2: A schematic diagram of the structure of a stacking unit according to an embodiment of the present application.

In the picture: 1-battery pack total positive terminal; 2-battery pack total negative terminal; 3-filled airtight enclosure; 4-pole piece capacity unit; 5-multifunctional voltage acquisition wiring harness; 6-capacity unit positive ear 7-capacity unit negative ear; 8-insulating impermeable membrane; 41-pole piece positive ear; 42-positive piece; 43-separation membrane; 44-negative piece; 45-pole piece negative ear.

detailed description

Specific examples of the application are given below. The specific embodiments are only used to further describe the application in detail, and do not limit the protection scope of the claims of the application.

One of the embodiments of the present application provides a liquid lithium ion pole piece battery pack (battery pack for short, see Figure 1-2), the battery pack includes a filled sealed packaging shell 3, a multi-functional voltage acquisition wiring harness 5, insulation and anti-seepage Membrane 8 and several pole piece capacity units 4;

The capacity unit negative tab 7 of one pole piece capacity unit 4 is connected to the capacity unit positive tab 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 to form a positive The series structure of negative phase connection improves the output voltage level of the battery pack; the positive ear 6 of the capacity unit of the first pole piece capacity unit 4 leads to the total positive terminal 1 of the battery pack; the negative ear of the capacity unit of the last pole piece capacity unit 4 7 Lead out the total negative terminal 2 of the battery pack; the positive lug 6 of the capacity unit or the negative lug 7 of the capacity unit between the two adjacent pole piece capacity units 4 is connected to a multi-functional voltage collection harness 5 through the ultrasonic welding process;

The positive lug 6 of the capacity unit of the first pole piece capacity unit 4 is connected to a multi-functional voltage collection harness 5 through an ultrasonic welding process, and the negative lug 7 of the capacity unit of the last pole piece capacity unit 4 is connected to a multi-functional voltage collection through an ultrasonic welding process Wire harness 5; an insulation barrier film 8 is set between two adjacent pole piece capacity units 4, and each pole piece capacity unit 4 is separately separated to form an independent insulation unit to ensure the protection of each pole piece capacity unit 4 The electrolyte does not communicate with each other;

Drying, injecting electrolyte and forming in a closed protective gas environment with controllable environmental conditions such as temperature and air pressure (preferably, first clamp the battery pack so that the position of the battery pack is fixed. After drying, injecting electrolyte, clamping and forming in a closed protective gas environment with controllable environmental conditions), fill the sealing material with injection molding solidification, foaming solidification or liquid injection solidification on the outside of the battery pack. Filling and sealing the inner gap to form a filling and sealing shell 3, sealing and packaging all the outer periphery of the battery pack and filling all the remaining space inside the battery pack, realizing the isolation of the battery pack from the external environment and the integration of the components of the battery pack Fixed; at the same time, the battery pack's total positive terminal 1, battery pack's total negative terminal 2 and all multi-function voltage acquisition wiring harnesses 5 are positioned through the filled airtight packaging shell 3, and external wiring is reserved on the outside of the filled airtight packaging shell 3. head.

Among them, the number of pole piece capacity units 4 in the series structure is determined according to the total voltage requirement of the battery pack.

Optionally, the filling and sealing material adopts PP, PE, PU, ABS or epoxy resin and other insulating heat-resistant, weather-resistant, solvent-resistant and flame-retardant polymer materials.

In this embodiment, the multifunctional voltage collection harness 5 is used to collect the real-time voltage of the pole piece capacity unit 4, and monitor the voltage level change of each pole piece capacity unit 4 in real time during battery pack formation and use, so as to prevent the battery pack from overcharging Over-discharge; at the same time, external circuits can be connected in parallel through the multi-function voltage acquisition harness 5 to realize the control of the voltage of a specific pole piece capacity unit 4 during the charging and discharging process.

The insulating and impermeable film 8 can be made of PE, PET, PP, epoxy resin or mica sheet, with a thickness of 0.1 mm to 3 mm.

Preferably, each pole piece capacity unit 4 has the same capacity and is composed of several stacked units in parallel; the parallel connection of the stacked units allows the voltage level to be maintained and the capacity of the battery pack is increased to achieve high current discharge.

The stacking unit is formed by cutting and stacking a number of positive plates 42, a number of negative plates 44, and a number of separators 43, and a layer of separator 43 is adhesively arranged between each group of positive plates 42 and negative plates 44. The end of the positive pole 42 is the pole piece positive lug 41, and the end of the negative pole 44 is the pole piece negative lug 45; the pole piece positive lug 41 of all the stacked units of each pole piece capacity unit 4 is connected by an ultrasonic welding process One capacity unit positive lug 6, and all pole piece negative lugs 45 of each pole piece capacity unit 4 are connected to form a capacity unit negative lug 7 through an ultrasonic welding process. Preferably, the capacity of each stacking unit is the same. The number of pole pieces is determined according to the capacity requirement of the pole piece capacity unit 4.

Preferably, the positive electrode lug 41 of the pole piece can be made of aluminum foil, microporous aluminum foil or aluminum mesh; preferably, the positive electrode plate 42 can be made of lithium cobaltate, lithium manganate, ternary lithium or lithium iron phosphate; preferably, isolation The membrane 43 can be a lithium ion permeable electronic insulating microporous membrane such as PP, PE, or PET; preferably, the negative electrode sheet 44 can be made of artificial graphite, natural graphite, mesocarbon microspheres, silicon-carbon composite material or lithium titanate negative electrode sheet. ; Preferably, the pole piece negative lug 45 can choose copper foil, microporous copper foil or copper mesh.

In the formation process, after draining the excess electrolyte, connect the battery pack's total positive terminal 1 (or positive bus), battery pack's total negative terminal 2 (or negative bus), and the external terminals of the multifunctional voltage collection harness 5 The activation device performs high-voltage, constant-current, and constant-voltage segmented charge and discharge activation in a closed protective gas environment where environmental conditions such as temperature and air pressure are controllable (in this embodiment, it is preferably set to be heated and pressurized); the activation conditions are: activation The direct current voltage is 5V-1000V (preferably 5V-750V), the temperature is 30-65°C (preferably 45°C-60°C), and the air pressure is 150kpa-250kpa; the activation device can adopt an automatically adjustable constant current and constant voltage DC power supply.

After the battery pack is made, connect welding fixtures to the battery pack's total positive terminal 1 and the battery's total negative terminal 2, respectively, for connecting the positive bus and the negative bus respectively.

Another embodiment of the present application also provides a method for preparing a liquid lithium ion pole piece battery pack, which includes the following steps:

Step 1. Preparation of the pole piece capacity unit 4: After cutting several positive pole pieces 42, several negative pole pieces 44 and several separators 43, the ends of the positive pole piece 42 are the pole piece positive lugs 41 and the ends of the negative electrode piece 44 The part is the pole piece negative lug 45, and an isolation film 43 is arranged between the positive pole piece 42 and the negative pole piece 44. Stacking in this way obtains a stacking unit; several stacking units are connected in parallel to form the pole piece capacity unit 4; according to this method Several pole piece capacity units 4 are obtained, and each pole piece capacity unit 4 has the same capacity;

The pole piece positive lugs 41 of all the stack units of each pole piece capacity unit 4 are connected to form a capacity unit positive lug 6 by an ultrasonic welding process, and all the pole piece negative lugs 45 of each pole piece capacity unit 4 are connected by an ultrasonic welding process. One capacity unit negative ear 7;

Step 2. Preparation of the lithium-ion pole piece battery pack to be activated by liquid injection: connect the capacity unit negative ear 7 of one pole piece capacity unit 4 to the capacity unit positive ear 6 of the previous or next pole piece capacity unit 4 through an ultrasonic welding process , And then connect all the pole piece capacity units 4 one by one end to end to form a series structure of positive and negative connections to improve the output voltage level of the battery pack; the capacity unit positive ear 6 of the first pole piece capacity unit 4 leads to the total battery pack Positive terminal 1; the capacity unit negative lug 7 of the last pole piece capacity unit 4 leads to the total negative terminal 2 of the battery pack; the capacity unit positive lug 6 or the capacity unit negative lug 7 between two adjacent pole piece capacity units 4 Connect a multi-functional voltage collection harness 5 through the ultrasonic welding process; the capacity unit positive lug 6 of the first pole piece capacity unit 4 is connected to a multi-functional voltage collection harness 5 through the ultrasonic welding process, and the capacity of the last pole piece capacity unit 4 The unit negative ear 7 is connected to a multifunctional voltage collection harness 5 through an ultrasonic welding process; an insulating barrier film 8 is arranged between two adjacent pole piece capacity units 4, and each pole piece capacity unit 4 is separately separated to form Independent unit to ensure that the electrolyte of each pole piece capacity unit 4 does not communicate with each other, and obtain a lithium-ion pole piece battery pack to be activated by liquid injection;

Preferably, the insulating and impermeable film 8 is made of PE, PET, PP, epoxy resin or mica sheet, with a thickness of 0.1 mm to 3 mm.

Step 3. Liquid injection: Clamp the battery pack to be activated by the liquid in step 2 in a sealed environment with controllable conditions such as temperature and air pressure, so that the position of the battery pack to be activated by liquid injection Fix; connect the battery pack's total positive terminal 1 to the positive bus through the welding fixture, and the battery pack's total negative terminal 2 to the negative bus through the welding fixture; then connect the multifunctional voltage collection harness 5, the positive bus and the negative bus The external terminal leads to a closed environment with controllable temperature and air pressure; then, it is sealed and passed into a protective gas such as nitrogen to form a closed protective gas environment with controllable temperature and air pressure, and the drying is carried out in it. Lithium ion electrolyte injection (drying first and then liquid injection, this embodiment is to soak the dried lithium ion electrode battery pack to be injected into the lithium ion electrolyte for full infiltration);

Step 4. Activation: After the liquid injection is completed, drain the excess electrolyte, clamp the battery pack, and connect the multi-function voltage acquisition harness 5, the external terminals of the positive bus and the negative bus to the activation device, and the temperature and air pressure are controllable Perform high-voltage constant current and constant voltage segmented charge and discharge activation in a closed protective gas environment (in this embodiment, heating and pressurization conditions);

Among them, 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 be automatically adjustable and constant current DC power supply.

Step 5. After activation, a filled airtight package is formed through a filled airtight package that seals all the outer periphery of the battery pack and fills up all the remaining space inside the battery pack to realize the isolation of the battery pack from the external environment and the composition of the battery pack The parts are fixed to obtain a liquid lithium-ion pole piece battery pack.

Preferably, before the liquid injection in step 3, the lithium-ion pole piece battery pack to be activated by the liquid injection obtained in step 2 may be semi-filled airtight packaging, so that the design can reduce the risk of electrolyte intercommunication; the semi-filled airtight The packaging is: at least one of the four surfaces perpendicular to the insulating and impermeable membrane 8 without the positive lug 6 of the capacity unit and the negative lug 7 of the capacity unit is not filled and sealed, and is used for electrolyte immersion (That is, at least one of the front and back sides in Figure 1 is not filled and sealed); at the same time, the battery pack total positive terminal 1, the battery pack total negative terminal 2 and the multi-function voltage collection wiring harness 5 are positioned through the sealed packaging surface And reserve the external terminal on the outside of the hermetic packaging surface.

When a semi-filled hermetic package is used, in step 5, only the surface that is not filled with hermetic packaging needs to be filled hermetically packaged, and then combined with the semi-filled hermetic package to form a filled hermetic package shell 3; when the semi-filled hermetic package is not used In the case of type airtight packaging, in step 5, the outer periphery of the battery pack is airtightly packaged through the filling type airtight packaging and all the remaining space inside the battery pack is filled to form a filled airtight packaging shell 3, and the battery pack has a total positive terminal 1 and a battery The negative terminal 2 of the package and the multifunctional voltage collection harness 5 are positioned through the filled sealed package shell 3, and external terminals are reserved on the outside of the filled sealed package shell 3.

The external terminals of the total positive terminal 1 of the battery pack and the total negative terminal 2 of the battery pack are respectively connected to the positive bus and the negative bus through a welding fixture.

The filled airtight package fills and seals the outer periphery and internal voids of the battery pack by filling the sealing material by injection solidification, foaming solidification or liquid injection solidification; the filling and sealing material adopts PP, PE, PU, ABS or epoxy Resin and other insulating heat-resistant, weather-resistant, solvent-resistant and flame-retardant polymer materials.

Preferably, the obtained liquid lithium ion pole piece battery pack can be connected to an electrical appliance and a battery management system to form a charge and discharge energy storage power source.

Another embodiment of the present application also provides an application of a liquid lithium ion pole piece battery pack. The liquid lithium ion pole piece battery pack can be connected to an electrical appliance and the battery management system HBMS to form a charge and discharge energy storage power source.

The above embodiments are only used to illustrate the technical solutions of the present application without limitation, and the present application is described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that modifications or equivalent replacements can be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application, and all shall be covered by the scope of the claims of the present application.

Claims

A liquid lithium ion pole piece battery pack, which is characterized in that the battery pack includes a filling type airtight packaging shell, an insulating impermeable membrane and a number of pole piece capacity units;

The negative ear of the capacity unit of one pole piece capacity unit is connected to the positive ear of the capacity unit of the next or next pole piece capacity unit, and then all the pole piece capacity units are connected end to end in turn to form a series structure of positive and negative connections;

The positive ear of the capacity unit of the first pole piece capacity unit leads to the total positive terminal of the battery pack; the negative ear of the capacity unit of the last pole piece capacity unit leads to the total negative terminal of the battery pack;

An insulating and anti-seepage film is arranged between two adjacent pole piece capacity units, and each pole piece capacity unit is separately separated to form an independent unit;

The outer periphery and inner gap of the battery pack are filled and sealed to form a filled sealed packaging shell. At the same time, the external terminals of the battery pack's total positive terminal and the battery pack's total negative terminal are reserved on the outside of the filled sealed packaging shell.
The liquid lithium-ion pole piece battery pack according to claim 1, further comprising: a plurality of multifunctional voltage collection wiring harnesses, and the positive ear of the capacity unit or the negative ear of the capacity unit between two adjacent pole piece capacity units One of the multifunctional voltage collection wiring harnesses is connected to the upper; the positive ear of the capacity unit of the first pole piece capacity unit is connected to one of the multifunctional voltage collection wiring harnesses, and the negative ear of the capacity unit of the last pole piece capacity unit is connected to one of the multifunctional Voltage collection wiring harness.
The liquid lithium-ion pole piece battery pack according to claim 2, wherein the outer side of the filling type sealed package shell is reserved with an external terminal of the multifunctional voltage collection harness.
The liquid lithium ion pole piece battery pack according to claim 1, wherein the filling type airtight packaging is performed on the outer periphery and the inner space of the battery pack by filling a sealing material to form the filling type airtight packaging shell.
The liquid lithium ion pole piece battery pack according to claim 4, characterized in that:

The filling and sealing material adopts insulating, heat-resistant, weather-resistant, solvent-resistant and flame-retardant polymer materials;

And/or, the insulating and impermeable film is made of PE, PET, PP, epoxy resin or mica sheet, with a thickness of 0.1 mm to 3 mm.
The liquid lithium ion pole piece battery pack according to claim 5, wherein the filling and sealing material is PP, PE, PU, ABS or epoxy resin.
The liquid lithium-ion pole piece battery pack according to any one of claims 1 to 6, characterized in that, the filled hermetic package is realized by filling a sealing material by injection molding solidification, foaming solidification or liquid injection solidification .
The liquid lithium ion pole piece battery pack according to claim 1, wherein each of the pole piece capacity units has the same capacity and is composed of several stacked units in parallel.
8. The liquid lithium ion pole piece battery pack according to claim 8, wherein the capacity of each stacking unit is the same.
The liquid lithium ion pole piece battery pack according to claim 8 or 9, characterized in that:

The stacking unit includes: a number of positive plates, a number of negative plates, and a number of separators, and a separator film is provided between each group of positive plates and the negative plates;

The end of the positive electrode piece is a positive electrode lug of the electrode piece, and the end of the negative electrode piece is a negative electrode lug of the electrode piece;

The positive ears of the pole pieces of all the stacking units of each of the pole piece capacity units are connected to form a positive ear of the capacity unit, and all the negative ears of the pole pieces of each of the pole piece capacity units are connected to form a negative ear of the capacity unit.
The liquid lithium ion pole piece battery pack according to claim 10, wherein:

The anode lug of the pole piece adopts aluminum foil, microporous aluminum foil or aluminum mesh film;

And/or, the positive electrode plate adopts lithium cobalt oxide, lithium manganate, ternary lithium or lithium iron phosphate positive electrode;

And/or, the isolation membrane adopts PP, PE or PET lithium ion permeable electronic insulating microporous membrane;

And/or, the negative electrode sheet adopts artificial graphite, natural graphite, mesocarbon microspheres, silicon-carbon composite material or lithium titanate negative electrode sheet;

And/or, copper foil, microporous copper foil or copper mesh film can be used for the negative electrode ear of the pole piece.
A method for preparing a liquid lithium ion pole piece battery pack according to any one of claims 1-11, characterized in that it comprises:

Preparation of pole piece capacity unit;

Preparation of a lithium-ion pole piece battery pack to be activated by liquid injection;

Refill: Connect the battery pack's total positive terminal to the positive bus, and the battery pack's total negative terminal to the negative bus; then lead the external terminals of the positive bus and the negative bus to a closed environment with controllable temperature and air pressure; Then seal and pass in protective gas to form a closed protective gas environment with controllable temperature and pressure conditions, and inject liquid into it;

Activation: Drain the excess electrolyte, connect the external terminals of the positive bus and negative bus to the activation device, and activate in a closed protective gas environment with controllable temperature and pressure conditions;

After activation, the filling type airtight packaging is used to form a filled airtight packaging shell that seals all the outer periphery of the battery pack and fills all the remaining space inside the battery pack to realize the isolation of the battery pack from the external environment and the fixation of the battery pack components. The liquid lithium ion pole piece battery pack is obtained.
The preparation method according to claim 11, characterized in that, in the above-mentioned external terminal of the positive bus and the negative bus out of the airtight environment with controllable temperature and air pressure, the method further comprises: reconnecting the multifunctional voltage The external terminal of the collection harness leads to a closed environment with controllable temperature and air pressure;

And/or, in the above-mentioned draining excess electrolyte and connecting the external terminals of the positive bus and the negative bus to the activation device, it also includes: connecting the external terminals of the multifunctional voltage acquisition harness to the activation device.
The preparation method according to claim 12, characterized in that, before the electrolyte is injected, the lithium-ion electrode battery pack to be activated by the injection is clamped in a sealed environment with controllable temperature and pressure conditions, so that The position of the battery pack of the lithium-ion pole piece to be activated by the injection is fixed; connect the total positive terminal of the battery pack to the positive bus, and the total negative terminal of the battery pack to the negative bus; then connect the multifunctional voltage collection harness, the positive bus and the negative bus The external terminal leads out the airtight environment with controllable temperature and air pressure; then airtight and pass protective gas to form an airtight protective air environment with controllable temperature and air pressure, and dry it in it;

And/or, after draining the excess electrolyte, you need to clamp the battery pack, connect the multi-function voltage acquisition harness, the positive bus and the external terminal of the negative bus to the activation device; in a heated and pressurized airtight protective gas environment Carry out high-voltage constant current and constant voltage segmented charge and discharge activation in a high-voltage environment.
The preparation method according to claim 12 or 13 or 14, wherein the activation conditions are: activation DC voltage 5V～1000V, temperature 30～65℃, air pressure 150kpa～250kpa; the activation device adopts automatic adjustment Constant current and constant voltage DC power supply.
The preparation method according to claim 12 or 13 or 14, characterized in that, the above-mentioned lithium-ion pole piece battery pack to be activated by liquid injection is semi-filled and hermetically sealed; the semi-filled hermetically sealed package is: Among the four vertical surfaces of the impermeable membrane, at least one of the two surfaces without the positive ear of the capacity unit and the negative ear of the capacity unit is not filled and sealed for electrolyte immersion; at the same time, the battery pack has a positive terminal , The total negative terminal of the battery pack and the multi-function voltage collection harness are positioned through the sealed packaging surface, and external terminals are reserved on the outside of the sealed packaging surface.
The preparation method according to claim 15, characterized in that, when a semi-filled hermetic package is used, it is only necessary to perform a filled hermetic package on the surface that is not filled with a hermetically sealed package, and then combine it with the semi-filled hermetic package to form a filled package. When the semi-filled hermetic package is not used, the outer periphery of the battery pack is hermetically sealed through the filled hermetic package and all the remaining space inside the battery pack is filled to form a filled hermetic package shell. At the same time, the battery pack is The positive terminal, the total negative terminal of the battery pack, and the multi-function voltage acquisition wiring harness are positioned through the filled airtight packaging shell, and external terminals are reserved on the outside of the filled airtight packaging shell.
An application of a liquid lithium ion pole piece battery pack, characterized in that, after connecting the liquid lithium ion pole piece battery pack according to any one of claims 1-11 to an electrical appliance and a battery management system, a charge and discharge energy storage power source is made .