CN212874691U - Laminate polymer battery structure and battery test gas production processing apparatus - Google Patents

Abstract

The utility model provides a gas processing apparatus is produced in laminate polymer battery structure and battery test, the utility model discloses a laminate polymer battery structure includes the casing that comprises the plastic-aluminum membrane, encapsulates the utmost point group in the casing to and link to each other and stretch out positive pole utmost point ear and negative pole utmost point ear outside the casing respectively with utmost point group, and it has electrolyte to fill in the casing, just laminate polymer battery structure is set up to the utmost point side of organizing that is located the below to and be located the air pocket side of top, utmost point side and the inside intercommunication of air pocket side, and utmost point group and electrolyte are located utmost point side of organizing, and positive pole utmost point ear and negative pole utmost point ear are stretched out by the double-phase offside of utmost point side respectively to be equipped with the control valve subassembly of at least one and the inside intercommunication of air pocket side on the casing of air pocket. The utility model discloses a laminate polymer battery structure can realize the discharge of the inside product of battery through the control valve subassembly's of gas bag side setting, not only can carry out the detection and analysis to product gas, also can control the battery is pressed in, and still can be to annotating liquid in the battery in order to supply electrolyte.

Description

Laminate polymer battery structure and battery test gas production processing apparatus

Technical Field

The utility model relates to a power battery technical field, in particular to laminate polymer battery structure, simultaneously, the utility model also relates to a gas processing apparatus is produced in battery test that is used for above-mentioned laminate polymer battery structure.

Background

In recent years, with the adjustment of national policies and the development of battery technologies, large companies and battery companies have come to strive for the layout of pouch batteries in terms of battery routing. The basic structure of the soft package power battery is similar to that of a cylinder and a square, and the soft package lithium battery is a liquid lithium ion battery sleeved with a polymer shell, and is structurally packaged by an aluminum plastic film to play a role in protecting an internal battery cell material.

Compared with square and cylindrical hard shell lithium batteries, the soft package battery has the advantages that the energy density of the soft package battery is higher by about 10% on average under the same material system, and the soft package battery can better meet the requirement that a passenger vehicle realizes product competitiveness by long endurance. And laminate polymer battery can only blow the gas fracture at most when taking place the potential safety hazard and can not form the burst type explosion like the steel-shelled lithium cell, simultaneously, if laminate polymer battery thermal runaway phenomenon appears, its energy release process is also very gentle and mild, can provide comparatively abundant reaction time of fleing for personnel after reporting to the police.

In addition, compare in steel-shelled battery, laminate polymer battery also has characteristics such as small, the quality is little, light in weight, more is nimble on battery spatial layout to laminate polymer battery electrochemical performance is good, and the module can integrate higher energy density, and the internal resistance is less simultaneously, can greatly reduce the self-power consumptive of battery, therefore also can have longer cycle life.

However, the production process of the soft package battery is complex, the lamination process is generally adopted instead of winding type manufacturing, and in the lamination die cutting process, burrs are easily generated on the punched section, powder is easily dropped, and the quality of the pole piece is poor, so that the safety performance of the finished battery is seriously influenced. And laminate polymer battery's uniformity is relatively poor, need to match better battery thermal management system when using, and it can lead to the battery cost to a certain extent to rise.

In addition, in the research and design process of the soft package battery, a series of parameters such as pre-charging formation, charge-discharge capacity, cycle performance, rate capability, safety and the like in the battery manufacturing process need to be evaluated, and in the test process, the research on the battery reaction mechanism in the whole life cycle has important significance on the optimization design of the soft package battery. The bulge is caused by gas generation in the charging and discharging process, but the design of the soft package battery at present cannot carry out analysis research on pre-charging generated gas in the manufacturing process of the soft package battery, calendar life generated gas after the manufacturing process is finished, cycle life generated gas and safety test generated gas.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a laminate polymer battery structure to realize the discharge of the generated gas in the battery, so as to perform the analysis and research of the generated gas.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a laminate polymer battery structure, includes the casing that constitutes by the plastic-aluminum membrane, encapsulate in utmost point group in the casing, and with utmost point group links to each other and stretches out respectively to anodal utmost point ear and negative pole utmost point ear outside the casing, and in it has electrolyte to fill in the casing, just laminate polymer battery structure is set up to have the utmost point group side that is located the below to and be located the air pocket side of top, utmost point group side with the inside intercommunication of air pocket side, just utmost point group with electrolyte is located utmost point group side, anodal utmost point ear with negative pole utmost point ear is stretched out respectively by the two opposite sides of utmost point group side, air pocket side is because of both sides laminating between the casing or pressing close to each other and be the platykurtic, and in air pocket side be equipped with at least one on the casing with the control valve subassembly of the inside intercommunication of air pocket side, control valve subassembly with sealed setting between the casing, and the control valve component is operated by receiving external operation so as to form the conduction or close the conduction between the inner part of the air bag side and the outside.

Furthermore, the control valve assembly comprises a connecting piece, a valve and a sealing unit, wherein one end of the connecting piece is located in the air bag side, the other end of the connecting piece penetrates out of the shell from one side, the valve is connected to one end, penetrating out of the connecting piece, and the sealing unit is clamped between the valve, the shell and one end, located in the air bag side, of the connecting piece.

Further, the connecting piece is located the one end in the gas bag side is constructed and is had the bottom plate, the valve with the one end that the connecting piece links to each other is constructed and is had outer splint, sealed unit is including pressing from both sides and locates the bottom plate with interior sealing gasket between the shells inner wall, and press from both sides and locate outer splint with the outer gasket between the shells outer wall.

Further, the valve is a manual valve.

Compared with the prior art, the utility model discloses following advantage has:

(1) the utility model discloses a laminate polymer battery structure passes through the setting of the control valve subassembly of air pocket side, and utilizes under the external operation control valve subassembly can constitute the inside and external switching on of air pocket side or close should switch on, and it can realize the discharge of the inside product gas of battery from this to can carry out the detection and analysis research to product gas in the battery, can also press to control in the battery, in addition, it also can be through the interior notes liquid of control valve subassembly to the battery in order to supply electrolyte, and has fine practicality.

(2) The sealing arrangement between the control valve component and the shell is carried out through the bottom supporting plate, the outer clamping plate and the inner and outer sealing gaskets, the structure is simple, the implementation is convenient, and the sealing is reliable.

Another objective of the present invention is to provide a gas processing apparatus for battery test of laminate polymer battery structure as above, and this gas processing apparatus for battery test is including detachable connect in gas collection device on the control valve subassembly, gas collection device can cause switching on of control valve subassembly with intercommunication in the air pocket side, just gas collection device is set up to constitute right the discharge of the gas in the air pocket side to receive and store up the exhaust gas.

Furthermore, the battery test gas production processing device also comprises a detection device for detecting the gas stored by the gas collection device.

Further, the detection device adopts a gas chromatograph.

Furthermore, an exhaust check valve is connected in series with a pipeline of the gas collecting device, which is used for being connected with the control valve component.

Furthermore, the battery test gas production processing device also comprises a liquid injection device detachably connected to the control valve assembly, and the liquid injection device can be communicated with the air bag side due to the conduction of the control valve assembly so as to fill electrolyte into the air bag side.

Furthermore, a liquid injection check valve is connected in series with a pipeline of the liquid injection device, which is used for connecting with the control valve component.

The utility model discloses a gas processing apparatus is produced in battery test, through the collection storage of gas collection device to the gas production of battery, can realize the detection analysis research to the gas production, simultaneously, it also can realize the control to the pressure in the battery to the discharge of gas production, and does to supply electrolyte in the battery through priming device, and has fine practicality.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of a pouch battery structure according to an embodiment of the present invention;

fig. 2 is a side view of a pouch battery structure according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

fig. 4 is a schematic view of the battery test gas production processing device according to the embodiment of the present invention;

description of reference numerals:

1-shell, 2-pole group side, 3-gas bag side, 4-control valve component, 5-gas collecting device, 6-exhaust joint, 7-exhaust one-way valve, 8-liquid injection device, 9-liquid injection joint and 10-liquid injection one-way valve;

201-pole group, 202-anode tab, 203-cathode tab;

401-valve, 4011-outer clamping plate, 402-connecting piece, 4021-bottom supporting plate, 403-inner sealing gasket and 404-outer sealing gasket.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a soft package battery structure, which is shown in fig. 1 and fig. 2 in combination with fig. 3, and includes a case 1 made of an aluminum-plastic film, a pole group 201 packaged in the case 1, and a positive electrode tab 202 and a negative electrode tab 203 connected to the pole group 201 and respectively extending out of the case 1, wherein the case 1 is filled with an electrolyte.

Like the soft package power battery commonly used in the prior art, the electrode assembly 201 in the soft package battery of this embodiment is also manufactured by a lamination process, and generally includes a positive electrode plate, a negative electrode plate, and a separator, where the separator is used to separate the positive electrode plate from the negative electrode plate, and the electrode assembly 201 is the most central part in the battery. The positive electrode tab 202 is formed by connecting an aluminum foil with a certain size reserved on one side of a positive electrode sheet with the positive electrode aluminum tab in a welding manner in a process, performing pre-welding and final welding on the tab after lamination is completed, and finally packaging the positive electrode tab outside an aluminum-plastic film by adopting a shell 1 of the aluminum-plastic film.

The positive tab 202 serves to connect the pole set 201 to an external circuit. The negative electrode tab 203 is manufactured substantially the same as the positive electrode tab 202, and also functions as a connection for the electrode assembly 201 and an external circuit, so that the positive electrode tab 202 is engaged to allow a closed circuit to be formed between the electrode assembly 201 and the external circuit. The electrolyte enclosed in the battery is a bridge for connecting the positive and negative electrode materials in the electrode assembly 201 to provide a passage for the transfer of ions.

The casing 1 made of the aluminum-plastic film is to package the electrode group 201, the positive electrode tab 202, the negative electrode tab 203, the electrolyte and the like into a battery, and the battery can be packaged by four-edge sealing or three-edge sealing generally, and the aluminum-plastic film used in the packaging process also ensures that the battery does not leak, and simultaneously, the overall appearance of the battery is smooth.

In this embodiment, specific manufacturing of the pouch battery structure may be referred to the existing similar products, and details thereof are not repeated herein. Further, still referring to what is shown in fig. 1 to 3, the pouch cell structure of the present embodiment is also provided with the pole group side 2 located below, and the gas pocket side 3 located above, in an overall structure. At this time, the electrode group 201 and the electrolyte inside the battery are located on the electrode group side 2, the positive electrode tab 202 and the negative electrode tab 203 are also respectively extended from the two opposite sides of the electrode group side 2, the air bag side 3 is flat due to the adhesion or close contact between the case bodies 1 on both sides, and the electrode group side 2 and the air bag side 3 are also communicated with each other inside the battery.

The soft package battery structure including the electrode group side 2 and the gas bag side 3 of the present embodiment is specifically a case 1 for packaging, that is, when packaging the battery, the lower aluminum-plastic film packages three sides of the electrode group 201 and the positive electrode tab 202 and the negative electrode tab 203 connected to two opposite sides, and the electrolyte is also retained in the region of the lower electrode group side 2. The air bag side 3 is formed by only an aluminum-plastic film, and two layers of aluminum-plastic films of the front surface and the back surface (one of the front surface and the other corresponding back surface) are adhered together, or a tiny gap is formed between the two layers of aluminum-plastic films, so that the two layers of aluminum-plastic films are in a state of being close to each other. When the package is performed, the air bag side 3 is also three-side sealed, and the non-sealed side of the pole group side 2 and the air bag side 3 is the side where the two overlap, so that the pole group side 2 and the air bag side 3 are communicated with each other.

With the encapsulation of the housing 1 made of an aluminum-plastic film, the overall shape of the pouch cell structure including the pole group side 2 and the gas pouch side 3 is also formed in the form shown in fig. 2, which also ensures that the pole group 201 and the electrolyte are on the pole group side 2. In addition, when the electrode group 2 in the electrode group side 2 reacts with the electrolyte to generate gas, the gas is also lightly introduced into the gas bag side 3, and the gas bag side 3 is inflated due to the introduction of the generated gas, and thus the gas bag side 3 becomes a gas generation region of the storage battery.

Based on the storage of the gas bag side 3 to the gas generated in the battery, the present embodiment is one of the main points of the structure of the soft package battery, and at least one control valve assembly 4 communicated with the inside of the gas bag side 3 is conveniently arranged on the housing 1 of the gas bag side 3. The control valve assembly 4 is sealed with the housing 1, and the control valve assembly 4 is also operable by receiving an external operation, thereby enabling or disabling communication between the interior of the bag side 3 and the outside.

In detail, as an exemplary configuration, the control valve assembly 4 of the present embodiment includes a connecting member 402 having one end located in the airbag side 3 and the other end protruding from the housing 1 on one side, a valve 401 connected to the end from which the connecting member 402 protrudes, and a sealing unit interposed between the valve 401, the housing 1, and the end of the connecting member 402 located in the airbag side 3.

Here, also as an exemplary embodiment, the present embodiment is configured with a bottom support plate 4021 at one end of the connecting member 402 located in the air bag side 3, and an outer clamping plate 4011 at one end of the valve 401 connected to the connecting member 402, and the sealing unit includes an inner sealing pad 403 sandwiched between the bottom support plate 4021 and the inner wall of the housing 1, and an outer sealing pad 404 sandwiched between the outer clamping plate 4011 and the outer wall of the housing 1.

At this time, the inner sealing pad 403 and the outer sealing pad 404 are usually made of silicon rubber, and the valve 401 and the connecting member 402 are usually connected by a screw connection method. In addition, as shown in fig. 3, the valve 401 of the present embodiment may be a manual valve. However, besides the manual valve, the valve 401 may also be an electromagnetic controlled automatic valve, and the valve 401 of this embodiment should be noted to have better air tightness regardless of the manual valve or the automatic valve.

It should be noted that, in this embodiment, the valve 401 may be disposed in other conventional structures, except for the above disposition of the valve 401 on the housing 1 at the airbag side 3. Furthermore, instead of providing only a single control valve assembly 4 as shown in fig. 1, the control valve assemblies 4 may be provided in other numbers according to actual design requirements, and the arrangement of the areas of the gas bag side 3 where the respective control valve assemblies 4 are located may also be arranged according to design requirements.

When a plurality of control valve assemblies 4 are used, it is of course possible to connect the control valve assemblies 4 in parallel outside the battery for efficient discharge of the gas produced in the battery entering the gas bag side 3, depending on the application.

Based on the above-mentioned pouch battery structure, the present embodiment further relates to a battery test gas production processing apparatus for the above-mentioned pouch battery structure, and as shown in fig. 4, the battery test gas production processing apparatus includes a gas collecting device 5 detachably connected to a valve 401 in a control valve assembly 4. The gas collecting device 5 can communicate with the bag side 3 by the conduction of the control valve assembly 4, and the gas collecting device 5 of the present embodiment is also provided to discharge the gas in the bag side 3 and store the discharged gas.

In this case, the gas collecting device 5 generally adopts the existing vacuum pumping negative pressure gas collecting component, and the battery test gas production processing device of the embodiment also includes a detecting device for detecting the gas stored in the gas collecting device 5 on the basis of collecting the gas. The detection device usually employs a gas chromatograph.

In order to ensure that the gas generated in the battery can be effectively collected by the gas collecting device 5, the gas collecting device 5 is also connected with a gas exhaust one-way valve 7 in series on a pipeline connected with the control valve component 4, and the gas exhaust one-way valve 7 is a one-way flow valve component commonly adopted in the existing gas pipeline structure.

In addition to the discharge and collection of the gas generated in the battery through the control valve assembly 4, the gas generation processing device for battery test further includes a liquid injection device 8 detachably connected to the control valve assembly 4, and the liquid injection device 8 can also be communicated with the air bag side 3 due to the conduction of the control valve assembly 4, so that the air bag side 3 can be filled with electrolyte.

At this time, the liquid injection device 8 generally adopts a fluid pump structure capable of filling electrolyte, or it may be a filling device for filling electrolyte of a pouch battery in the prior art. In addition, in order to ensure that the filled electrolyte smoothly enters the air bag side 3, namely, the soft package battery, a liquid injection one-way valve 10 is also connected in series on a pipeline of the liquid injection device 8 for connecting with the control valve component 4, and the liquid injection one-way valve 10 also adopts a one-way circulation valve component in the existing fluid conveying pipeline.

In this embodiment, the gas collecting device 5 and the liquid injecting device 8 can be respectively connected to the valve 401 through the gas discharging connector 6 and the liquid injecting connector 9, and the connection can be, for example, a screw connection form, or in order to facilitate the connection and the detachment, it can also make the gas discharging connector 6 and the liquid injecting connector 9 both set as the existing quick-connection-plug structure, and correspondingly set the end of the valve 401 for connection.

In addition, it should be noted that, in addition to the gas collecting device 5 and the liquid injection device 8 being connected to the valve 401 through respective pipelines, the pipelines of the gas collecting device 5 and the liquid injection device 8 may be partially integrated in this embodiment, so that at least a part of the pipelines can be shared by the gas collecting device 5 and the liquid injection device 8, thereby simplifying the pipelines and reducing the amount of the pipelines.

The battery test gas production processing device of the embodiment can realize the discharge and collection of gas generated in each stage during the pre-charging of the battery by utilizing the arrangement of the control valve component 4 on the soft package battery structure, and can carry out quantitative analysis and detection on the gas through a gas chromatograph. Similarly, when the battery is subjected to tests such as cycle life, calendar life and safety test, the discharge and collection of the produced gas can be carried out, and detection and analysis can be carried out. In addition, except collecting and exhausting gas for detection, the internal of the battery can be decompressed through the exhaust of the gas, and electrolyte can be supplemented to the battery tested for a long time through the liquid injection device 8.

Therefore, the embodiment can research the reaction mechanism of the battery by collecting and detecting the generated gas, and can also improve the overlarge internal pressure of the battery and the service life attenuation of the battery caused by the large consumption of the gas and the electrolyte in the battery, thereby having good practicability.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a laminate polymer battery structure, includes casing (1) that constitutes by the plastic-aluminum membrane, encapsulate in utmost point group (201) in casing (1), and with utmost point group (201) link to each other and stretch out respectively to casing (1) outer anodal utmost point ear (202) and negative pole utmost point ear (203), and in it has electrolyte, its characterized in that to fill in casing (1): the pouch cell structure is provided with a lower electrode group side (2) and an upper gas bag side (3), the electrode group side (2) is communicated with the gas bag side (3) inside, the electrode group (201) and the electrolyte are positioned on the electrode group side (2), the positive electrode tab (202) and the negative electrode tab (203) respectively extend out from two opposite sides of the electrode group side (2), the air bag side (3) is flat due to the joint or close connection between the shells (1) at the two sides, and at least one control valve component (4) communicated with the interior of the air bag side (3) is arranged on the shell (1) of the air bag side (3), the control valve component (4) and the shell (1) are arranged in a sealing way, and the control valve component (4) is operated by receiving external operation, so that the connection between the interior of the gas bag side (3) and the outside can be formed or closed.

2. The pouch cell structure of claim 1, wherein: the control valve assembly (4) comprises a connecting piece (402) with one end positioned in the air bag side (3) and the other end penetrating through the shell (1) on one side, a valve (401) connected to one end penetrating through the connecting piece (402), and a sealing unit clamped between the valve (401), the shell (1) and one end of the connecting piece (402) positioned in the air bag side (3).

3. The pouch cell structure of claim 2, wherein: one end of the connecting piece (402) positioned in the air bag side (3) is provided with a bottom supporting plate (4021), one end of the valve (401) connected with the connecting piece (402) is provided with an outer clamping plate (4011), and the sealing unit comprises an inner sealing gasket (403) clamped between the bottom supporting plate (4021) and the inner wall of the shell (1) and an outer sealing gasket (404) clamped between the outer clamping plate (4011) and the outer wall of the shell (1).

4. The pouch cell structure of claim 3, wherein: the valve (401) is a manual valve.

5. A battery test gas production processing device for the laminate battery structure of any one of claims 1 to 4, characterized in that: the battery test gas production processing device comprises a gas collecting device (5) detachably connected to the control valve assembly (4), wherein the gas collecting device (5) can be communicated with the gas bag side (3) due to the conduction of the control valve assembly (4), and the gas collecting device (5) is arranged to discharge gas in the gas bag side (3) and store the discharged gas.

6. The gas production processing device for battery test according to claim 5, characterized in that: the battery test gas production processing device also comprises a detection device for detecting the gas stored by the gas collection device (5).

7. The gas production processing device for battery test according to claim 6, characterized in that: the detection device adopts a gas chromatograph.

8. The gas production processing device for battery test according to claim 5, characterized in that: and a gas exhaust one-way valve (7) is connected in series with a pipeline of the gas collecting device (5) for connecting with the control valve component (4).

9. The gas production processing device for battery test according to claim 5, characterized in that: the battery test gas production processing device further comprises a liquid injection device (8) detachably connected to the control valve assembly (4), and the liquid injection device (8) can be communicated with the air bag side (3) due to the conduction of the control valve assembly (4) so as to fill electrolyte into the air bag side (3).

10. The gas production processing device for battery test according to claim 9, characterized in that: a liquid injection one-way valve (10) is connected in series with a pipeline of the liquid injection device (8) for connecting with the control valve component (4).

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