CN221041243U

CN221041243U - High-capacity battery

Info

Publication number: CN221041243U
Application number: CN202322283301.7U
Authority: CN
Inventors: 韩晓宇; 郑高锋; 白晓峰
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2023-01-11
Filing date: 2023-08-24
Publication date: 2024-05-28
Anticipated expiration: 2033-08-24
Also published as: CN118073694A

Abstract

The utility model discloses a high-capacity battery, which comprises a plurality of unit batteries connected in parallel, wherein electrolyte cavities of the unit batteries are communicated and form a shared electrolyte system, and an adsorption structure for absorbing impurities in electrolyte is arranged in the shared electrolyte system. Through setting up adsorption structure in sharing electrolyte system, this adsorption structure can absorb the moisture that the high-capacity battery preparation working process introduced into the electrolyte, has avoided the battery performance that the production of HF caused to receive the problem that influences, has reduced simultaneously and has become the gas yield in the in-process, has reduced the degree that the battery takes place the bulge, and then has ensured the performance and the cycle life of high-capacity battery.

Description

High-capacity battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a high-capacity battery.

Background

With the further development of lithium ion batteries in recent years, the application scenes of lithium ion batteries are more and more extensive, and particularly, the application scenes with larger requirements on the battery capacity are more and more. For example: the power battery of the automobile, the energy storage battery forming the household light storage integrated machine, the battery forming the energy storage system for the power plant and the like.

In the above usage scenario, in order to meet the requirement of larger capacity, a plurality of single batteries (generally cylindrical batteries or prismatic batteries) are connected together in a serial-parallel connection manner to form a large-capacity battery.

However, due to the difference of the individual cells in the large-capacity battery, the uniformity of the individual cells in the large-capacity battery is poor, and the cycle life of the battery pack or the large-capacity battery is directly limited, so how to improve the uniformity of the individual cells in the large-capacity battery becomes a key point and a difficulty of research in the field.

Chinese patent, publication No. CN114759251a discloses a large capacity battery, including two at least monomer electric cores and electrolyte stock solution pipeline, electrolyte stock solution pipeline is including trunk line and a plurality of branch pipes that have the multi-branch road stock solution pipeline, there is the stock solution chamber in the trunk line, can hold electrolyte, the branch pipe is located between trunk line and the monomer electric core, be equipped with the opening on the monomer electric core casing, the branch pipe with battery casing opening one-to-one is connected, in order to realize electrolyte stock solution pipeline and monomer electric core intercommunication, make a plurality of monomer electric cores be in same electrolyte system.

The establishment of the shared electrolyte system reduces the difference between the electrolyte capacities of all the single batteries and improves the cycle life of the high-capacity battery to a certain extent.

However, when the high-capacity battery is manufactured, moisture is inevitably introduced into the electrolyte, HF generated by the moisture entering the electrolyte damages the SEI film to deteriorate the battery performance, and meanwhile, the gas yield of the high-capacity battery is increased in the formation process, so that the battery is inflated.

Disclosure of utility model

The utility model provides a high-capacity battery, which aims to solve the problems that the battery performance is poor and the battery is possibly swelled due to moisture introduced during the manufacturing of the existing high-capacity battery.

The high-capacity battery comprises a plurality of unit batteries which are connected in parallel, wherein electrolyte cavities of the unit batteries are communicated and form a shared electrolyte system, and an adsorption structure for absorbing impurities in electrolyte is arranged in the shared electrolyte system. Through setting up adsorption structure in sharing electrolyte system, this adsorption structure can absorb the moisture that the high-capacity battery preparation working process introduced into the electrolyte, has avoided the battery performance that the production of HF caused to receive the problem that influences, has reduced simultaneously and has become the gas yield in the in-process, has reduced the degree that the battery takes place the bulge, and then has ensured the performance and the cycle life of high-capacity battery.

Further, in order to facilitate the manufacture and assembly of the high-capacity battery, the above-mentioned shared electrolyte system includes a hollow member including a plurality of first hollow units disposed on the lower cover plate of each unit cell and respectively communicating with the electrolyte chambers of each unit cell, and a plurality of second hollow units for communicating each first hollow unit.

Furthermore, according to the structural characteristics of the hollow member, the adsorption mechanism can be arranged at one end of the hollow member in a sealing manner, the adsorption structure is an adsorption core rod, at least part of the adsorption core rod is positioned in the hollow member, and meanwhile, the liquid injection and exchange mechanism is arranged at the other end of the hollow member. The shared electrolyte system of the high-capacity battery not only has the function of adsorbing impurity water, but also has the function of filling and replacing the shared electrolyte system.

The utility model can also replace the liquid filling and changing mechanism with the explosion venting valve, and the hollow component can be used as the explosion venting channel of the large-capacity battery when a certain single battery is out of control.

The liquid filling and changing mechanism has various forms, and the utility model provides the following two types:

The concrete structure of the first liquid injecting and changing mechanism is as follows: the liquid filling and changing mechanism comprises a valve and a liquid pumping and filling device, wherein one end of the valve is communicated with the hollow member, and the other end of the valve is communicated with the liquid pumping and filling device.

The valve can select a three-way valve, a first port of the three-way valve is communicated with the hollow component, a second port of the three-way valve is communicated with the liquid pumping and injecting device, and a third port of the three-way valve is used for being connected with a vacuum pumping device, so that the design can not only meet the liquid pumping and injecting function, but also complete the vacuum pumping operation before liquid injection, and the electrolyte can smoothly enter each single battery.

Preferably, in the first liquid filling and changing mechanism, in order to improve efficiency and save labor cost, the liquid pumping and filling device is an electric pump.

The concrete structure of the second liquid filling and changing mechanism is as follows: the liquid filling and changing mechanism comprises a sealing cap and a rubber pad; the sealing cap is arranged at the end part of the hollow member in a sealing way and is used for sealing the end part from the outside; the rubber cushion is fixedly arranged, and the rubber cushion can be used for inserting a liquid injection needle tube. This annotate trading liquid mechanism utilizes detachable block at the normal during operation of large capacity battery, sealed cavity component, tears the block off when annotating trading liquid in needs, inserts and annotates the liquid needle tubing and can realize annotating trading liquid operation, and this kind of second kind annotates trading liquid mechanism structural style is simple structure compared with first kind annotates trading liquid mechanism structure, and structural cost is lower, simultaneously because this annotates liquid mechanism does not have any consumer, therefore the security is higher, but the operation is loaded down with trivial details relatively, and work efficiency is lower relatively.

Further, the material of the adsorption core rod is alpha-Al ₂O₃. The impurity gas generated in the normal operation of the battery can be adsorbed.

Furthermore, the material of the adsorption core rod is a lithiated molecular sieve, and compared with a common molecular sieve, the lithiated molecular sieve not only basically maintains the superior adsorption performance of the common molecular sieve, but also can greatly reduce the introduction of impurity ions Na+ in an electrolyte system, and is one of the most effective and economical physical methods in the micro water removal method of the lithium ion battery.

Further, the adsorption mechanism can have the function of filling and replacing liquid, and the specific setting mode is as follows: one end of the hollow member is provided with an explosion venting valve, the other end of the hollow member is provided with a sealing end cover, and the end cover is provided with a positioning blind hole; a supporting ring is arranged in the hollow member; the adsorption structure is a double-layer adsorption pipe, one end of the double-layer adsorption pipe is inserted into the blind hole of the sealing end cover, one part of the double-layer adsorption pipe penetrates through the support ring, and the other end of the double-layer adsorption pipe is opened; the inner layer pipe of the double-layer adsorption pipe is used as a liquid injection channel, and the outer pipe is an adsorption layer; one end of the double-layer adsorption tube positioned in the positioning blind hole is provided with a rubber plug for inserting the liquid injection needle tube.

When the multi-layer adsorption tube is in operation, the sealing end cover can be detached, then electrolyte is injected into the hollow member through the inner layer tube of the multi-layer adsorption tube by the liquid injection needle tube, and the outer layer tube is exposed to the electrolyte as an adsorption layer, so that moisture in the electrolyte can be adsorbed.

Further, the adsorption structure is a resin package arranged in the hollow member, and the resin package comprises a core layer and a coating layer wrapping the core layer; the core layer is resin containing polar amide groups, and the coating layer is a filter screen capable of enabling electrolyte to freely enter and exit. The resin has strong polarity, can absorb small molecular impurities such as H ₂O、PF₅, HF and the like in the electrolyte, purify the electrolyte and improve the cycle performance of the high-capacity battery.

Drawings

Fig. 1 is a schematic structural view of embodiment 1;

FIG. 2 is a schematic diagram of an adsorption core rod with the adsorption structure in example 1;

fig. 3 is an assembly schematic diagram of hollow members when assembled from unit cells in example 1;

FIG. 4 is a schematic diagram of the liquid filling and exchanging mechanism in the embodiment 2;

Fig. 5 is a schematic structural view of embodiment 4;

FIG. 6 is a schematic diagram of a double-layered adsorption tube with the adsorption structure in example 4;

FIG. 7 is a graph of the capacity retention rate of a battery using α -Al ₂O₃ as the adsorption mandrel material in example 3; wherein the abscissa represents the number of cycles and the ordinate represents the capacity retention rate.

The reference numerals are as follows:

1-adsorption structure, 11-adsorption core rod, 12-sealing connection cover, 13-sealing end cover, 14-positioning blind hole, 15-supporting ring, 16-double-layer adsorption tube, 17-rubber plug, 2-single battery, 3-hollow component, 31-first hollow unit, 32 second hollow unit, 4-filling liquid exchange mechanism, 41-valve, 42-liquid sucking and injecting device, 43-third port, 44-sealing cap, 45-rubber pad and 46-fixing ring.

Detailed Description

The technical solutions of the embodiments will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden, are within the scope of the present utility model based on the following examples.

Meanwhile, it should be noted that the positional or positional relationship indicated by the terms such as "upper, lower, inner and outer" and the like herein are based on the positional or positional relationship shown in the drawings, and are merely for convenience of description, and are not intended to indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the technical scheme. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixedly connected, detachably connected or integrally connected: it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model designs a high-capacity battery, which aims to solve the problems that the battery performance is poor and the battery is possibly swelled caused by moisture introduced during the manufacture of the existing high-capacity battery, and has the following principle structure: comprises an adsorption structure and a plurality of single batteries;

The plurality of single batteries are arranged in parallel, and electrolyte cavities of the single batteries are communicated to form a shared electrolyte system; an adsorption structure for absorbing impurities in the electrolyte is arranged in the shared electrolyte system. This large capacity battery is through communicating each battery cell electrolyte chamber to make each battery cell all be in under the unified shared electrolyte system, through the difference that has reduced between each battery cell capacity, the uniformity between each battery cell has been promoted to a certain extent, thereby the cycle life of large capacity battery has been promoted, and through setting up the adsorption structure in shared electrolyte system, this adsorption structure mainly used absorbs the moisture in the large capacity battery electrolyte, the battery performance that the production of HF caused has been avoided receives the problem of influence, the gas yield of formation in-process has been reduced simultaneously, the degree that the battery takes place the bulge has been reduced, and then the performance and the cycle life of large capacity battery have been ensured. Meanwhile, the adsorption structure can also adsorb other impurities existing in the electrolyte after long-time use in the high-capacity battery to a certain extent.

The purpose of the shared electrolyte system is to communicate the electrolytes of multiple cells so that all cells are under one electrolyte system, which can be achieved in a number of ways:

1. Through setting up the opening on a plurality of battery cells, then soak a plurality of battery cells in a sealed box that holds electrolyte for the electrolyte in a plurality of battery cell electrolyte chamber and the electrolyte in the sealed box intercommunication and constitute an electrolyte system, the shared electrolyte system of high-capacity battery has been formed promptly.

Under the structure of the shared electrolyte system, the anode and the cathode of each single battery connected in parallel are electrically connected with the anode and the cathode of the sealed box body, so that the high-capacity battery with the shared electrolyte system is formed. The adsorption structure can be directly soaked in the electrolyte of the sealed box body to finish the adsorption of the moisture in the electrolyte.

2. Through set up the opening on a plurality of battery cells, through the opening intercommunication of pipeline and every battery cell for the electrolyte in a plurality of battery cell electrolyte chamber and the electrolyte in the pipeline communicate and constitute an electrolyte system, have formed the shared electrolyte system of large capacity battery promptly.

The high-capacity battery according to the present utility model, based on the high-capacity battery of the shared electrolyte system constructed by the piping described in the above (two), is described in more detail by the following examples:

example 1

As shown in fig. 1, the large-capacity battery in the present embodiment includes an adsorption structure 1 and a plurality of unit cells 2; the plurality of single batteries 2 are arranged in parallel, each single battery 2 is communicated through the hollow member 3, and then the electrolyte cavity of each single battery 2 and the hollow member 3 form a shared electrolyte system of the large-capacity battery; the adsorption structure 1 is positioned in the hollow member 3, the adsorption structure 1 is fixed with one end of the hollow member 3 in a sealing way, and the other end of the hollow member 3 is provided with a liquid injection and exchange mechanism 4 or an explosion venting valve. When the explosion venting valve is arranged, once thermal runaway occurs in the high-capacity battery due to a certain single battery, the thermal runaway smoke can be released outside through the hollow member and the explosion venting valve, and the smoke is treated in a single or combined mode of ignition, adsorption or cooling, so that the safety of the high-capacity battery is ensured.

As shown in fig. 2, the adsorption structure 1 is an adsorption core rod 11, and the adsorption core rod 11 is at least partially positioned in the hollow member 3; in order to prevent the adsorption core rod 11 from being in contact with the outside air, moisture in the air is adsorbed, and the adsorption performance of the adsorption core rod is affected or even disabled. Thus, in the present embodiment, the outer layer of the adsorption core rod 11 may be provided with a protective layer that is soluble in the electrolyte. The specific form of sealing and fixing the adsorption core rod 11 and one end of the hollow member is quite various, in this embodiment, the adsorption core rod 11 may be fixed on a sealing connection cover 12 with external threads, and the adsorption core rod 11 with the sealing connection cover 12 may be directly fixed on one end of the hollow member 3 by adopting a threaded connection manner during installation, so that in order to ensure the tightness, a sealant may be applied at the threaded connection position.

It was found that Polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), polyacrylate resin copolymer (SMMA), engineering plastic (ASA) can be well dissolved in the electrolyte and does not pollute the electrolyte, and particularly polymethyl methacrylate (PMMA) can also serve as an electrolyte additive to improve the performance of the battery after being dissolved in the electrolyte, so that the protective layer is preferably made of polymethyl methacrylate in this embodiment.

In this embodiment, the hollow member 3 is actually an elongated hollow tube formed by splicing, and the specific structure is shown in fig. 3: the hollow member 3 includes a plurality of first hollow units 31 provided on the lower cover plate of the unit cells 2 and respectively communicating with the electrolyte chambers of the unit cells, and a plurality of second hollow units 32 for communicating the respective first hollow units 31. When each single battery is assembled side by side, the hollow member can be formed by butt joint between the first hollow unit 31 and the second hollow unit 32, so that the assembly process is simplified, and meanwhile, the tightness of the whole shared electrolyte system can be well controlled by butt joint of the first hollow unit 31 and the second hollow unit 32.

It should be noted that, in the present embodiment, the first hollow unit 31 is a hollow pipe directly integrally formed on the lower cover plate. The second hollow unit 32 is a single hollow tube (which is similar to a joint).

In addition to the spliced hollow members given in this embodiment, in some other embodiments, the hollow members may take other forms, such as:

In some embodiments, the hollow member 3 is an elongated hollow tube, and the side wall of the elongated hollow tube is provided with a plurality of through holes. During manufacturing, the single batteries are firstly arranged side by side to form groups, then a plurality of through holes of the thin hollow pipe are aligned with openings on the single batteries, and then the thin hollow pipe and each single battery are welded and fixed.

In some embodiments, the hollow member 3 comprises a main tube and a plurality of branch tubes provided on the main tube, each branch tube communicating with an opening in one of the cells and being fixed to the housing of the cell by means of welding.

Compared with the spliced type, the two modes have the main defects that the difficulty in later welding of the hollow component on the single battery is relatively high, and the condition of liquid leakage can exist at the communication position of the welded single battery and the hollow component.

In this embodiment, the liquid filling and changing mechanism 4 adopts a valve and a liquid pumping and filling device, the valve 41 adopts a manual or electric stop valve, one port of the valve is communicated with the hollow member 3, and the other end of the valve can be connected with a liquid pumping and filling device 42. When the electrolyte filling device is used, the valve is opened, and electrolyte or a lithium supplement additive is filled into the shared electrolyte system by using the liquid sucking and filling device, or the electrolyte in the shared electrolyte system is replaced.

On the basis of the liquid filling and changing mechanism 4, in order to further improve the function of the liquid filling and changing mechanism, the valve can be a three-way valve, the first port of the three-way valve is communicated with the hollow member 3, the second port is communicated with the liquid pumping and filling device 42, and the third port 43 is communicated with the vacuumizing device, so that besides the liquid filling and changing function, the liquid filling and changing mechanism can be used for vacuumizing the shared electrolyte system, and the electrolyte can smoothly enter the shared electrolyte system during subsequent liquid filling.

In this embodiment, the pump may be an electric pump.

Example 2

The structure of this embodiment is substantially the same as that of embodiment 1, and is different from embodiment 1 in that a different liquid injection and exchange mechanism 4 is adopted, and the adsorption core rod adopts a molecular sieve, as shown in fig. 4, the liquid injection and exchange mechanism 4 in this embodiment adopts a combination form of a sealing cap, a rubber pad and a liquid injection needle tube, and specifically, as shown in fig. 5, the liquid injection and exchange mechanism 4 comprises a sealing cap 44, a rubber pad 45 and a liquid injection needle tube; a sealing cap 44 is sealingly mounted to an end of the hollow member for sealing the end from the outside; the rubber cushion 45 is fixedly arranged in the hollow member at a position close to the sealing cap 44, and the rubber cushion 45 can be used for inserting a liquid injection needle tube. The main purpose of this mode of filling and changing the mechanism to set up the sealing cap 44 is: the hollow member 3 is sealed twice together with the rubber pad, so that the overall sealing performance is improved, the isolation from the external environment is realized, and meanwhile, the rubber pad 45 is prevented from being corroded by the external environment due to direct contact with the external environment, and in other embodiments, the sealing cap 44 is not required.

In use, the sealing cap 44 is removed from the hollow member 3, and then a liquid injection needle tube is inserted into the hollow member 3 from the rubber mat 45, and electrolyte or lithium supplement additive can be injected into the shared electrolyte system or electrolyte in the shared electrolyte system can be replaced through the liquid injection needle tube.

In order to facilitate the rubber cushion 45 to be fixed in the hollow member 3, the embodiment is provided with a fixing ring 46 made of the same material as the hollow member 3, the rubber cushion 45 is embedded in the fixing ring 46, and the fixing ring 46 is fixed in the hollow member 3 by riveting or welding.

In the embodiment, no electric equipment is needed in the liquid injection and exchange mechanism on the hollow member, and the safety is high.

Example 3

Unlike example 2, this example replaces the material of the adsorption core rod with α -Al ₂O₃. In the embodiment, by comparing adsorption core rods made of different materials, the alpha-Al ₂O₃ has a good effect on capacity improvement. See fig. 7 for specific experimental data. In fig. 7, 8 large-capacity batteries were selected as experimental samples, and "untreated" in the drawing refers to samples in which an adsorption structure for adsorbing impurities in an electrolyte was not provided in a shared electrolyte system. The 3A molecular sieve refers to an adsorption structure which is arranged in the shared electrolyte system and used for absorbing impurities in the electrolyte, and the material of an adsorption core rod in the adsorption structure is a sample of the 3A molecular sieve. The 4A molecular sieve refers to an adsorption structure which is arranged in the shared electrolyte system and used for absorbing impurities in the electrolyte, and the material of an adsorption core rod in the adsorption structure is a sample of the 4A molecular sieve. The 'alpha-Al ₂O₃' refers to an adsorption structure which is arranged in the shared electrolyte system and used for absorbing impurities in the electrolyte, and the material of the adsorption structure for adsorbing the core rod is a sample of alpha-Al ₂O₃.

Example 4

Unlike example 2, this example replaces the material of the adsorption core rod with a lithiated molecular sieve. Compared with the common molecular sieve, the lithiated molecular sieve not only basically maintains the superior adsorption performance of the common molecular sieve, but also can greatly reduce the introduction of impurity ions Na+ in an electrolyte system, and is one of the most effective and economical physical methods in the micro water removal method of the lithium ion battery.

Example 5

Unlike embodiments 1 and 2, the adsorption structure 1 itself has a liquid injection and exchange function, so that an explosion venting valve can be provided on the hollow member, and the liquid injection and exchange mechanism is not required to be separately provided, so that the large-capacity battery can have an impurity adsorption function, a liquid injection and exchange function, and an explosion venting function for the electrolyte.

As shown in fig. 6, in this embodiment, a explosion venting valve is disposed at one end of the hollow member 3, a sealing end cover 13 is disposed at the other end (for easy disassembly, the sealing end cover is fixed on the hollow member in a threaded connection manner), and a positioning blind hole 14 is formed on the sealing end cover 13; the support ring 15 is disposed in the hollow member 3 (the support ring 15 may be disposed in the first hollow unit 31 or the second hollow unit 32 of any one of the unit cells in advance in this embodiment); the adsorption structure is a double-layer adsorption tube 16, one end of the double-layer adsorption tube 16 is inserted into the positioning blind hole 14 of the sealing end cover 13, one part of the double-layer adsorption tube 16 penetrates through the support ring 15, and the other end of the double-layer adsorption tube is open; the inner layer tube of the double-layer adsorption tube 16 is used as a liquid injection channel, and the outer tube is an adsorption layer; one end of the double-layer adsorption tube 16 positioned in the positioning blind hole 14 is provided with a rubber plug 17 for inserting a liquid injection needle tube. In order to prevent the double-layered adsorption tube 16 from adsorbing moisture in the air when it comes into contact with the outside air, the outer layer of the double-layered adsorption tube is also provided with a protective layer soluble in an electrolyte in this embodiment, and is preferably made of polymethyl methacrylate, as in example 1. In this embodiment, alumina is used as the adsorption layer.

When the battery pack is in operation, the sealing end cover 13 can be removed firstly, the liquid injection needle tube is inserted into the rubber plug 19, and the liquid injection and replacement process of the high-capacity battery can be realized by utilizing the liquid injection needle tube.

In the running process of the large-capacity battery, after the electrolyte dissolves the protective layer, the adsorption layer can adsorb impurities in the electrolyte.

Meanwhile, when thermal runaway occurs in a single battery in the high-capacity battery, the thermal runaway smoke can be released outside through the hollow component and the explosion venting valve and is treated in a single or combined mode of ignition, adsorption or cooling and the like, so that the safety of the high-capacity battery is ensured.

Finally, the points to be described are: the openings of the so-called unit cells in the above embodiments are formed before or during the fabrication of the large-capacity battery is performed. Specifically, when the single battery is used alone, a sealing mechanism is required to seal the opening, so as to ensure that the inner cavity of the single battery is isolated from the external environment. At the same time, the sealing mechanism also needs to be opened before or during the fabrication of the high capacity battery.

The sealing mechanism can adopt a dissolving piece which can be made of electrolyte material, the material of the dissolving piece can also be made of polymethyl methacrylate, after the electrolyte is injected into the hollow component, the dissolving piece can be dissolved under the action of the electrolyte, the opening on the single battery is opened, the communication between the single batteries is realized, and the establishment of a shared electrolyte system of the high-capacity battery is completed.

The sealing mechanism can also adopt sealing sheets opened by external force, before electrolyte is injected into the hollow member, the sealing sheets on each single battery can be damaged by a special tool, or the sealing sheets are removed from the single batteries, the openings on the single batteries are opened, then the communication between the single batteries is realized, then the electrolyte is injected into the hollow member, and then the establishment of a shared electrolyte system of the high-capacity battery is completed.

Example 6

Unlike the above embodiment, the adsorption structure of the present embodiment is a resin pack provided in a hollow member, the resin pack including a core layer and a cladding layer wrapped on the core layer.

The core layer contains polar amide groupThe polar amide group resin comprises one or more of polydodecyl amide, poly omega-aminoundecyl amide, poly (butylene adipamide), polycaprolactam and poly (hexamethylene adipamide).

The coating layer is a filter screen which can freely pass in and out electrolyte, and in addition, the resin material of the core layer can be prevented from being diffused to the inner cavities of all the single batteries and adsorbed on the pole piece or the diaphragm, so that the problem of the performance damage of the single batteries can be solved.

The resin has strong polarity, can absorb small molecular impurities such as H ₂O、PF₅, HF and the like in the electrolyte, purify the electrolyte and improve the cycle performance of the high-capacity battery.

Claims

1. A high capacity battery characterized by: including parallelly connected a plurality of battery cells, each battery cell's electrolyte chamber all communicates to form shared electrolyte system, its characterized in that: an adsorption structure for absorbing impurities in the electrolyte is arranged in the shared electrolyte system.

2. The high-capacity battery according to claim 1, wherein: the shared electrolyte system comprises a hollow member, wherein the hollow member comprises a plurality of first hollow units which are arranged on the lower cover plate of each single battery and are respectively communicated with electrolyte cavities of the single batteries, and a plurality of second hollow units which are used for communicating the first hollow units.

3. The high-capacity battery according to claim 2, wherein: the method is characterized in that: one end of the hollow member is provided with a liquid injection and exchange mechanism or an explosion venting valve, and the other end of the hollow member is inserted with the adsorption structure; the adsorption structure is an adsorption core rod, and the adsorption core rod is at least partially positioned in the hollow member.

4. A high-capacity battery as claimed in claim 3, wherein: the liquid filling and changing mechanism comprises a valve and a liquid pumping and filling device, one end of the valve is communicated with the hollow member, and the other end of the valve is communicated with the liquid pumping and filling device.

5. The high-capacity battery as claimed in claim 4, wherein: the valve is a three-way valve, a first port of the three-way valve is communicated with the hollow member, a second port of the three-way valve is communicated with the liquid pumping and injecting device, and a third port of the three-way valve is used for being connected with the vacuumizing device.

6. The high-capacity battery according to claim 5, wherein: the liquid pumping and injecting device is an electric pump.

7. A high-capacity battery as claimed in claim 3, wherein: the liquid filling and changing mechanism comprises a sealing cap and a rubber pad; the sealing cap is arranged at the end part of the hollow member in a sealing way and is used for sealing the end part from the outside; the rubber cushion is fixedly arranged in the hollow member and positioned at a position close to the sealing cap, and the rubber cushion can be used for inserting the liquid injection needle tube.

8. A high-capacity battery as claimed in claim 3, wherein: the material of the adsorption core rod is alpha-Al ₂O₃.

9. A high-capacity battery as claimed in claim 3, wherein: the material of the adsorption core rod is a lithiated molecular sieve.

10. The high-capacity battery according to claim 2, wherein: one end of the hollow member is provided with an explosion venting valve, the other end of the hollow member is provided with a sealing end cover, and the end cover is provided with a positioning blind hole; a supporting ring is arranged in the hollow member; the adsorption structure is a double-layer adsorption pipe, one end of the double-layer adsorption pipe is inserted into the blind hole of the sealing end cover, one part of the double-layer adsorption pipe penetrates through the support ring, and the other end of the double-layer adsorption pipe is opened; the inner layer pipe of the double-layer adsorption pipe is used as a liquid injection channel, and the outer pipe is an adsorption layer; one end of the double-layer adsorption tube positioned in the positioning blind hole is provided with a rubber plug for inserting the liquid injection needle tube.

11. The high-capacity battery according to claim 2, wherein: the adsorption structure is a resin package arranged in the hollow member, and the resin package comprises a core layer and a coating layer wrapping the core layer; the core layer is resin containing polar amide groups, and the coating layer is a filter screen capable of enabling electrolyte to freely enter and exit.