CN115719865A - Liquid injection device and processing method of battery cell - Google Patents

Abstract

The invention discloses a liquid injection device and a processing method of a battery cell, wherein the liquid injection device comprises: the connecting pipe is provided with a near end used for receiving electrolyte and a far end used for being packaged in the soft package battery core, a liquid injection part and an exhaust part are formed in the connecting pipe, the liquid injection part is used for guiding the electrolyte injected from the near end to the far end, and the exhaust part is used for guiding gas in the soft package battery core to the near end from the far end so as to exhaust the soft package battery core. Therefore, on one hand, in the liquid injection process, the electrolyte is injected through the liquid injection part, so that the phenomena of electrolyte overflow and liquid splashing can be avoided, the electric core is prevented from being polluted, an air bag structure is not required to be arranged, the material cost is lower, and the production cost of the electric core can be reduced; on the other hand, the gas exhaust part can be used for gas exhaust in the chemical conversion process, so that the use environment of the liquid injection device can be increased, and the compatibility can be improved.

Description

Liquid injection device and processing method of battery cell

Technical Field

The invention relates to the technical field of batteries, in particular to a liquid injection device and a processing method of a battery cell.

Background

In the related art, in the processing process of the battery core, processes such as liquid injection and formation need to be performed, the liquid injection process injects electrolyte into the battery core, and the formation process activates the battery and discharges gas generated in the activation process.

As shown in fig. 1, in the prior art, the soft package battery cell is obtained by encapsulating the naked battery cell with an aluminum plastic film, the encapsulation of the battery cell needs to be split into one-time encapsulation and one-time encapsulation, and after one-time encapsulation, the naked battery cell is fixed in the naked battery cell placement area 200, and an air bag structure 400 is reserved; in the aluminum plastic film, the naked electric core placing area 200 is communicated with the air bag structure 400, and liquid injection and air exhaust are realized through the air bag structure 400; for example, during first sealing, a liquid injection port is reserved on the side of the air bag structure 400, and the liquid injection port is heat-sealed after liquid injection is completed; the waste gas generated during formation is pre-stored in the air bag structure 400, and the waste gas can be discharged by puncturing the air bag structure 400 with a guillotine and then vacuumizing. And after the formation process is finished, secondary packaging is carried out, and finally the air bag structure 400 is cut, so that the soft package battery core is basically formed. The area of the air bag structure 400 is approximately the same as that of the battery cell area, and cut air bag structure aluminum-plastic films all belong to waste; in addition, because the aluminum-plastic film is flexible, if the aluminum-plastic film of the airbag structure 400 shakes, the situation that the liquid injection needle cannot be aligned with the liquid injection port in the liquid injection process can also be caused.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a liquid injection device, which can reduce the material cost for processing a battery cell and avoid the phenomenon of liquid splashing during the liquid injection process.

The invention further provides a battery cell processing method based on the liquid injection device.

According to the liquid injection device of the embodiment of the first aspect of the invention, the liquid injection device comprises: the connecting pipe is provided with a near end used for receiving electrolyte and a far end used for being packaged in the soft package battery core, a liquid injection part and an exhaust part are formed in the connecting pipe, the liquid injection part is used for guiding the electrolyte injected from the near end to the far end, and the exhaust part is used for guiding gas in the soft package battery core to the near end from the far end so as to exhaust the soft package battery core.

According to the liquid injection device provided by the embodiment of the invention, on one hand, in the liquid injection process, the electrolyte is injected through the liquid injection part, so that the phenomena of electrolyte overflow and liquid splashing can be avoided, the electric core is prevented from being polluted, an air bag structure is not required to be arranged, the material cost is lower, and the production cost of the electric core can be reduced; on the other hand, the gas exhaust part can be used for gas exhaust in the chemical conversion process, so that the use environment of the liquid injection device can be increased, and the compatibility can be improved.

According to some embodiments of the invention, the cross-sectional shape of the connecting pipe is flat, and the width along the spreading direction of the soft packing cell is larger than the thickness.

Further, a liquid receiving part is formed at the near end of the connecting pipe, and the liquid receiving part is of a funnel-shaped structure.

Further, still fixed the being provided with laminating glue on the connecting pipe, laminating glue is kept away from the distal end, with the connection area of connecting pipe, laminating glue cladding in all surfaces of connecting pipe, the length that laminating was glued is greater than the width of connecting pipe, in order to incite somebody to action the connecting pipe encapsulation is in flexible package electricity core's plastic-aluminum membrane.

According to some embodiments of the invention, the liquid injection portion is closed off outwards and/or the gas exhaust portion is closed off inwards.

In some embodiments, the liquid injection part is shut off outwards by a first one-way valve, the first one-way valve comprising: the valve body is fixedly arranged on the connecting pipe, and the valve core is movably arranged on the connecting pipe and pushes against the valve body from inside to outside; and/or the exhaust part is cut off inwards through a second one-way valve, and the second one-way valve comprises: the fixing plate is arranged on one side, facing the far end, of the diaphragm, and is provided with an exhaust hole used for fixing the diaphragm and connected with the connecting pipe.

According to some embodiments of the invention, the connection tube comprises: the liquid injection part is formed by a liquid injection channel and a gas exhaust channel which are separated from each other, the liquid injection channel is formed into the liquid injection part, and the gas exhaust channel is formed into the gas exhaust part.

Further, the flow area of the exhaust channel is smaller than that of the liquid injection channel.

In some embodiments, the connection pipe has a common channel formed as a liquid injection channel at the time of liquid injection and as a gas discharge channel at the time of gas discharge, and the gas discharge portion and the liquid injection portion are integrated in the common channel.

Further, the second one-way valve is integrated with the first one-way valve, at least a portion of the valve body is formed as the fixed plate, and the first one-way valve is adjacent to the distal end than the second one-way valve.

Optionally, the diaphragm is obliquely arranged on the fixing plate.

Further, the valve core is spaced from the projection of the exhaust hole in the extending direction of the connecting pipe.

In some embodiments, the thickness of the liquid injection device is less than the thickness of the soft packing cell.

The processing method of the battery cell according to the embodiment of the second aspect of the invention comprises the following steps:

dividing an aluminum plastic film into a naked electric core placing area and a connecting area, wherein the area of the connecting area is smaller than that of the naked electric core placing area, arranging the liquid injection device communicated with the naked electric core placing area in the connecting area, and placing a naked electric core in the naked electric core placing area;

packaging the aluminum plastic film and the naked battery cell at one time to obtain a semi-finished battery cell;

and at least performing liquid injection and formation processes on the semi-finished product battery cell, performing secondary packaging on the semi-finished product battery cell, and cutting the connecting area and the liquid injection device to obtain the soft package battery cell.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

figure 1 is a schematic view of a semi-finished cell of the prior art;

fig. 2 is a schematic diagram of a semi-finished battery cell processed by using the liquid injection device according to the embodiment of the invention;

FIG. 3 is a schematic view of a priming device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a priming device according to a first embodiment of the present invention;

fig. 5 is a schematic view of a priming device according to a second embodiment of the present invention.

Reference numerals are as follows:

the liquid injection device 100, the naked electric core placing area 200, the connecting area 300, the air bag structure 400,

a connecting pipe 10, a liquid injection channel 11, an exhaust channel 12, a liquid receiving part 13, a bonding glue 14, a common channel 15,

the first check valve 20, the valve body 21, the spool 22,

a second one-way valve 30, a diaphragm 31, and a fixing plate 32.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

The liquid injection device 100 and the battery cell processing method according to the embodiment of the invention are described below with reference to fig. 1 to 5.

The liquid injection device 100 according to the embodiment of the first aspect of the invention comprises: connecting pipe 10, connecting pipe 10 have the near-end that is used for accepting electrolyte and be used for the encapsulation at the distal end in soft-packaged electrical core, are formed with notes liquid portion and exhaust portion in the connecting pipe 10, and it is used for the electrolyte drainage to the distal end that will pour into at the near-end to annotate liquid to soft-packaged electrical core to annotate liquid, and exhaust portion is used for the gas in the soft-packaged electrical core from distal end drainage to near-end, in order to exhaust soft-packaged electrical core.

Firstly, it can be understood that, referring to fig. 1, in the prior art, in the processing process of the soft package battery core, the aluminum plastic film defines the bare cell placement area 200 and the air bag structure 400, the bare cell is disposed in the bare cell placement area 200, during one-time packaging, the bare cell placement area 200 and the air bag structure 400 are packaged together, and the air bag structure 400 is provided with a liquid injection port, so that in the liquid injection process, electrolyte is injected into the bare cell placement area 200 through the liquid injection port, and in the injection process, the air bag structure 400 needs to be fixed by the suction cup, when the suction cup is loosened, the air bag structure 400 is easily subjected to inertia to movement (for example, the air bag is popped up from the position of the suction cup), which causes the overflow of the electrolyte, and the liquid splashing phenomenon easily occurs when the air bag structure 400 is cut.

Based on this, the present invention provides a liquid injection device 100, wherein a connection pipe 10 may be disposed on one side (any one of the top side, the bottom side, and the left side and the right side) of a semi-finished product battery cell, the semi-finished product battery cell includes a bare cell installation area 200 and a connection area 300 located on one side of the bare cell installation area 200, one end of the connection pipe 10 is disposed in the connection area 300 and is communicated with the bare cell placement area 200, the other end of the connection pipe 20 is used for receiving an electrolyte, and the connection pipe 10 is located below a liquid injection structure relatively, and can receive the electrolyte flowing out from the liquid injection structure below.

It should be noted that the proximal end and the distal end of the connection tube 10 are relative concepts, in the liquid injection process, the end closer to the operator or the liquid injection structure is the proximal end for receiving the electrolyte, and the end for injecting the electrolyte into the bare cell installation area 200 is the distal end, and when in use, the distal end needs to be packaged in a soft package cell.

Exemplarily, when the liquid injection device 100 of the present invention is used for processing an electrical core, the connection pipe 10 is disposed at one side of a bare electrical core to replace an air bag structure for injecting liquid, and an air bag structure is not required to be disposed, only the connection region 300 with a smaller area is disposed at one side where the liquid injection device 100 is disposed, the far end of the connection pipe 10 for receiving the electrolyte can be disposed with a butt-joint structure, and is in butt joint with the liquid injection structure, the near end of the connection pipe 10 of the liquid injection device 100 is communicated with the bare electrical core placement region 200 and is fixed on the connection region 300, in the liquid injection process, the electrolyte can be injected into the bare electrical core placement region 200 through the connection pipe 10, and the connection pipe 10 has rigidity, and is not required to be fixed through structures such as a suction cup, and the like, and an air bag structure is not required to be disposed, so that the usage amount of aluminum-plastic film materials can be reduced, and the connection pipe 10 can directly oppose the liquid injection structure to receive the electrolyte, and the connection stability with the liquid injection structure is higher, and after the liquid injection is completed, the rigid connection pipe 10 is removed from the cooperation with the liquid injection structure, and no large rebound can occur; when the liquid injection device is used for injecting liquid, the phenomena of electrolyte overflow and liquid splashing can be avoided, and the liquid injection effect is improved.

Simultaneously, still the integration is provided with exhaust portion on connecting pipe 10, and when semi-manufactured goods electricity core was in the formation process, can be through the gaseous discharge that exhaust portion produced in with naked electric core activation process to make priming device 100 have higher compatibility, at least at the priming process with the formation process, can annotate liquid and exhaust through priming device 100.

It should be noted that, the liquid injection part and the air exhaust part formed in the connection pipe 10 may be formed by installing the liquid injection part and the air exhaust part as a solid structure on the connection pipe 10 and communicating with the connection pipe 10, or forming the liquid injection part and the air exhaust part as a part of the connection pipe 10 and being defined by the structure of the connection pipe 10 itself, for example, a partition plate is provided to separately form the liquid injection part and the air exhaust part, or a channel is multiplexed, the liquid injection part is used as the liquid injection part in the liquid injection process, and the air exhaust part is used as the air exhaust part in the formation process.

In addition, in the embodiment that annotate liquid portion and exhaust part or communicate with connecting pipe 10 respectively, annotate liquid portion and pour into electrolyte into, the gaseous of naked electric core placing area 200 can be discharged through exhaust part, can maintain inside and outside pressure balance to improve and annotate liquid efficiency.

According to the liquid injection device 100 of the embodiment of the invention, on one hand, in the liquid injection process, the electrolyte is injected through the liquid injection part, so that the phenomena of electrolyte overflow and liquid splashing can be avoided, the electric core is prevented from being polluted, the air bag structure 400 is not required to be arranged, the material cost is lower, and the production cost of the electric core can be reduced; on the other hand, the gas exhaust unit can be used for gas exhaust in the chemical conversion process, so that the use environment of the injection device 100 can be increased, and the compatibility can be improved.

It can be understood that, in some embodiments, the structure of the connection pipe 10 may adopt a straight-through pipe, so that the bare cell placement area 200 is directly conducted with the outside through the connection pipe 10, and the exhaust part and the liquid injection part are defined by a flow channel in the connection pipe 10, in the liquid injection process, the injection of the electrolyte is directly performed through the communication pipe, and in the formation process, the cell may be in a vacuum or negative pressure environment, in the liquid supplement (electrolyte supplement to the bare cell placement area 200) process of the formation process, in the liquid injection process, the gas may also be discharged at the connection pipe 10.

As shown in fig. 3, the cross-sectional shape of the connection pipe 10 is a flat shape, and the width in the spreading direction of the soft pouch cell is larger than the thickness. Optionally, two sides of the connecting pipe 10 are cambered surfaces, so that the connecting pipe is convenient to be packaged with an aluminum-plastic film.

Specifically, the direction of spreading of soft-package battery core is perpendicular with soft-package battery core's thickness direction, and connecting pipe 10 can set up in soft-package battery core's top side, bottom side, left side or right side, then the direction that corresponds the width size place of connecting pipe 10 is soft-package battery core's length direction or width direction, and is the platykurtic through the cross sectional shape that makes connecting pipe 10, if: the oval shape, the ellipse shape and the like can make the flow area of the connecting pipe 10 larger so as to improve the liquid injection efficiency; and the liquid injection and air exhaust structures are convenient to be arranged separately.

As shown in fig. 3, according to some embodiments of the present invention, the proximal end of the connection tube 10 forms a liquid junction 13, and the liquid junction 13 is in a funnel-shaped configuration. The liquid receiving part can better butt the liquid injection needle and prevent the liquid splashing phenomenon; even if the injection needle deviates in a small range, the electrolyte can be injected into the soft package electric core. The liquid contact portion 13 may be formed integrally or may be mounted.

In other words, the cross-sectional area of the liquid receiving portion 13 gradually increases in the direction away from the bare cell placing region 200.

Specifically, connecting pipe 10 can be oval pipe or long round pipe, and connect liquid portion 13 can be oval platform shape or long round platform shape, so that the through-flow area of the liquid portion 13 that connects of connecting pipe 10 is bigger, thereby can improve exhaust efficiency and annotate liquid efficiency, it is consuming time with the formation process to reduce the notes liquid process, improve the machining efficiency of electric core, it is better that connect liquid portion 13 can also make connecting pipe 10 accept the effect of electrolyte simultaneously, annotate the liquid in-process, the probability that electrolyte spills over is lower, prevent to pollute electric core, and improve and annotate the liquid effect.

As shown in fig. 3, further, an adhesive 14 is fixedly disposed on the connection pipe 10, the adhesive 14 is close to the distal end, the adhesive 14 covers all outer surfaces of the connection pipe 10 in a connection area between the adhesive 14 and the connection pipe 10, and the length of the adhesive 14 is greater than the width of the connection pipe 10, so as to encapsulate the connection pipe 10 in an aluminum plastic film of a flexible package battery.

Specifically, the laminating glue 14 can be rectangular shape, sets up on connecting pipe 10 for the heat-seal of connecting pipe 10 and joining region 300 can improve once the encapsulation back, and priming device 100 and joining region 300's stability in connection and reliability, and after the heat-seal, sealed effect between connecting pipe 10 and the joining region 300 is better, can improve notes liquid effect and flowing back effect, and can avoid electrolyte to spill over by the laminating glue 14 and the clearance between joining region 300.

As an implementation manner, the adhesive 14 is adhered to the connection tube 10 in advance, the adhesive 14 is generally formed by pressing two adhesive tapes from two sides of the connection tube 10, that is, the outer surface of the connection tube 10 can be completely wrapped, and the length of the adhesive 14 is 5mm to 15mm longer than that of the connection tube 10, so as to avoid the phenomenon of poor packaging caused by too large deformation of the aluminum plastic film on two sides of the adhesive 14. The composition and structure of the bonding paste 14 may be dependent on the material used for the connection pipe 10. If the connecting tube 10 is a metal tube, the inner layer of the adhesive 14 is made of a material capable of adhering to metal, such as modified PP with metal affinity; if the connecting tube 10 is made of a plastic tube, the inner layer of the adhesive 14 is made of a material capable of adhering to plastic, such as plastic modified PP. The outer layer of the adhesive 14 is generally made of PP, and is thermally compressed and packaged with the inner layer of the aluminum plastic film.

It can be understood that the structure of the bonding adhesive 14 may also be detachably matched with the connecting pipe 10, and after the battery cell is processed, other structures of the liquid injection device 100 except the bonding adhesive 14 may be recycled, so that the processing cost of the battery cell may also be further reduced.

Further, the adhesive 14 and the liquid receiving portion 13 are located at both ends of the connection pipe 10. Like this, can make laminating glue 14 be located the relatively lower region of connecting pipe 10 pipe diameter, when reducing material cost, the area in the region that joining region 300 links to each other with connecting pipe 10 is littleer, also can improve once the encapsulation back, and the sealing performance of semi-manufactured goods electricity core ensures to annotate the liquid in-process, can not spill over electrolyte by the clearance between connecting pipe 10 and the joining region 300.

In some embodiments, the thickness of the injection device 100 is less than the thickness of the pouch. In other words, the thickness of the connection tube (10) and the liquid-receiving section 13 are both configured to be smaller than the thickness of the soft-packing cell thereof for liquid injection and/or gas exhaust. The liquid injection jig 100 with corresponding specifications can be adopted for the soft package battery cores with different specifications.

Specifically, the thickness refers to the size of the connection pipe 10 in the thickness direction of the battery cell, so that the thickness of the injection device 100 is smaller than that of the flexible package battery cell, in the formation process, the battery cell clamp can be prevented from touching the injection device 100, interference between the battery cell clamp and the injection device 100 is prevented, the injection device 100 is suitable for exhausting in the formation process, compatibility of the injection device 100 is improved, the battery cell clamp is prevented from damaging the injection device 100, and the working stability and reliability of the injection device 100 in the exhaust process can be ensured.

The connector tube 10 of embodiments of the present invention may take a variety of forms. For example, the interior of the flexible package cell is of a straight-through tube structure, and the structure is suitable for the situation that the flexible package cell does not move or turn over in the formation process; or, the inside of the connecting pipe 10 has a one-way liquid injection structure, which is suitable for the situation that the exhaust gas is less or the exhaust gas can be discharged through the one-way liquid injection structure; or, the connecting pipe 10 has a one-way liquid injection structure and a one-way air exhaust structure inside, which is suitable for most situations, and even if the battery cell is moved and turned over, liquid leakage can be prevented; even if a large amount of waste gas is produced in the battery core during formation, the waste gas can be discharged through the one-way exhaust structure.

The internal structure of the connection tube 10 can be roughly classified into the above three cases from simple to complex, but is not limited thereto.

As shown in fig. 4 and 5, according to some embodiments of the present invention, the liquid injection portion is cut off outwardly and/or the gas exhaust portion is cut off inwardly.

The inside and outside directions in the invention are relative concepts, the separation line between the connection area 300 and the naked electric core placement area 200 is used as a boundary, one side of the separation line facing the naked electric core placement area 200 is the inside, one side of the separation line far away from the naked electric core placement area 200 is the outside, the outward cutoff means that the electrolyte can be injected into the naked electric core placement area 200 from the outside, but the electrolyte in the naked electric core placement area 200 cannot overflow to the outside of the naked electric core placement area 200, the inward cutoff means that the outside gas cannot enter the naked electric core placement area 200 from the outside, but the gas in the naked electric core placement area 200 can be discharged to the outside.

It is understood that in some embodiments, the liquid injection part is blocked outwards by arranging a one-way blocking structure (such as a one-way valve); in other embodiments, the exhaust part is provided with a one-way stopping structure to realize inward stopping, preferably, the liquid injection part and the exhaust part are provided with one-way stopping structures, and the stopping directions of the liquid injection part and the exhaust part are different based on the difference between the injection direction of the electrolyte and the exhaust direction of the gas.

Specifically, the liquid injection part is cut off outwards, so that the electrolyte can be prevented from overflowing, the exhaust part is cut off inwards, and external foreign matters (such as dust and water) can be prevented from entering the bare cell placing area 200, so that the liquid injection effect and the exhaust effect are improved, and the processing quality of the cell is improved.

As shown in fig. 4 and 5, in some embodiments, the liquid injection part is shut off outwards by a first check valve 20, and the first check valve 20 includes: the valve body 21 is fixedly arranged on the connecting pipe 10, and the valve core 22 is movably arranged on the connecting pipe 10 and pushes against the valve body 21 from inside to outside; and/or the exhaust section is blocked inwardly by a second check valve 30, the second check valve 30 comprising: a diaphragm 31 and a fixing plate 32, the fixing plate 32 being disposed on a side of the diaphragm 31 facing the distal end, the fixing plate 32 having a vent hole for fixing the diaphragm 31 and being connected to the connection tube 10.

That is, the connection pipe 10 may be provided with a first check valve 20 and/or a second check valve 30, the first check valve 20 being disposed corresponding to the liquid injection portion to realize outward blocking of the liquid injection portion, and the second check valve 30 being disposed corresponding to the air exhaust portion to realize inward blocking of the air exhaust portion.

Wherein the first check valve 20 may be configured as a ball valve, the valve body 21 is disposed at the connection pipe 10, the valve core 22 is movably disposed on the connection pipe 10 by an elastic structure and may push the valve body 21 at the inner side to realize an outward cutoff, and the second check valve 30 is used for exhausting, so that a diaphragm valve structure using the diaphragm 31 may be provided.

Specifically, valve body 21 of first check valve 20 defines a valve port whose opening gradually decreases in a direction away from bare cell placement area 200, and spool 22 includes: the floating ball and the elastic piece, one end of the elastic piece is arranged on the connecting pipe 10, the other end of the elastic piece is connected with the floating ball, the valve port is blocked by the floating ball to realize outward cut-off, and the projection contour of the floating ball is consistent with that of the liquid injection part; the diaphragm 31 of second check valve 30 can adopt flexible material, is provided with the exhaust hole that link up fixed plate 32 including the foreign side is to going up on the fixed plate 32, and the inside gas that produces of naked electric core can be acted on to diaphragm 31 through the exhaust hole, and diaphragm 31 outwards swells, realizes exhausting from inside to outside, and diaphragm 31 inboard is fixed through fixed plate 32, and during the external world acted on, diaphragm 31 can not produce the change, can't switch on, realizes inwards ending.

Therefore, the one-way cut-off of the electrolyte is realized through the structure of matching the valve body 21 and the valve core 22, the gas cut-off is realized through the structure of the diaphragm 31, and the one-way medium effect and the stability of the liquid injection part and the gas exhaust part can be improved.

Of course, the structure of the embodiment of the present invention is not limited thereto, and in other embodiments, the structure of the second check valve 30 may be a structure in which the valve body 21 and the valve core 22 are engaged, similar to the first check valve 20.

It is understood that the air exhaust part and the liquid injection part of the embodiment of the present invention are both formed on the connection pipe 10, and the structures of the air exhaust part, the liquid injection part and the connection pipe 10 are exemplarily described below in two specific embodiments, and it should be understood that the first embodiment and the second embodiment are two optional structural forms of the present invention, and are not exhaustive.

The first embodiment:

as shown in fig. 4, in the first embodiment, the connection pipe 10 includes: the liquid injection device comprises a liquid injection channel 11 and a gas exhaust channel 12 which are separated, wherein the liquid injection channel 11 is formed into a liquid injection part, and the gas exhaust channel 12 is formed into a gas exhaust part.

Particularly, can be at inside baffle that sets up of connecting pipe 10 to separate out notes liquid passageway 11 and exhaust passage 12 two parts in connecting pipe 10, exhaust passage 12 is used for the exhaust, correspond to form exhaust portion, annotate liquid passageway 11 and be used for annotating the liquid, correspond to form and annotate liquid portion, annotate liquid portion and exhaust portion and separate apart from each other, can exhaust when annotating the liquid, annotate the liquid process and become the fluid infusion in-process of process, place district 200 to naked electric core and annotate the liquid while, the inside and outside atmospheric pressure balance can be realized to the exhaust, in order to improve and annotate liquid efficiency.

It can be understood that, the exhaust of formation process electricity core is less, and exhaust passage 12 need not to set up great, makes exhaust passage 12's through-flow area be less than the through-flow area of notes liquid channel 11, when taking into account notes liquid efficiency and exhaust effect, and the size of priming device 100 can set up more rationally, improves when the space occupies, can reduce priming device 100's manufacturing cost.

The second embodiment:

as shown in fig. 5, in the second embodiment, the connection pipe 10 has the common passage 15, the common passage 15 is formed as the liquid injection passage 11 at the time of liquid injection, and is formed as the gas discharge passage 12 at the time of gas discharge, and the gas discharge portion and the liquid injection portion are integrated in the common passage 15.

Specifically, the connecting pipe 10 is provided with a communicating channel for communicating the naked electric core placing area 200 with the outside, the communicating channel is partially or completely formed into a shared channel 15, the shared channel 15 is used for exhausting when exhausting, and is used for injecting liquid when injecting liquid, and the exhausting part and the liquid injection part are characterized as being limited in function, the exhausting area is formed into the exhausting part by the connecting pipe 10, the liquid injection part is formed by the area for injecting liquid by the connecting pipe 10, the structure of the connecting pipe 10 can be simplified when exhausting and injecting liquid are realized, and the cost of the liquid injection device 100 is reduced.

Exemplarily, the second one-way valve 30 may be integrated to the first one-way valve 20, i.e. at least part of the valve body 21 is formed as a fixed plate 32.

In this way, the valve body 21 is fixed to the connection pipe 10 and defines a valve port, and at least a portion of the valve body 21 is formed as the fixing plate 32 such that the exhaust hole of the fixing plate 32 is located on the peripheral side of the valve port, the valve port is used for filling liquid, the exhaust hole is used for exhausting gas, and a portion opposite to the exhaust hole in the inward and outward direction is formed as the common passage 15, so that filling and exhausting can be performed, and the filling efficiency and the exhausting efficiency can be improved.

Referring to fig. 4 and 5, the diaphragm 31 is obliquely disposed on the fixing plate 32, and in the extending direction of the connection pipe 10, the diaphragm 31 is far away from the bare cell placement area 200 than the valve core 22.

Specifically, the valve core 22 and the membrane 31 are both located in the connection area 300, and the valve core 22 is closer to the bare cell placing area 200 than the membrane 31, and the membrane 31 is obliquely arranged, so that the electrolyte accumulated in the air bag can be prevented from blocking the membrane 31 on the inner side of the membrane 31 or on the outer side of the membrane 31, and the stability and the reliability of the air exhaust part can be ensured.

Further, the first check valve 20 is adjacent to the distal end of the connection pipe 10 than the second check valve 30, that is, the spool 22 is spaced apart from the projection of the exhaust hole in the extending direction of the connection pipe 10.

That is, the valve body 21 defines a valve port, the exhaust hole is located on the periphery of the valve port, and the valve core 22 is spaced apart from the exhaust hole, so as to ensure that the valve core 22 does not block the exhaust hole during the exhaust process, thereby improving the exhaust efficiency.

The processing method of the battery cell according to the embodiment of the second aspect of the invention comprises the following steps:

dividing an aluminum plastic film into a naked electric core placing area 200 and a connecting area 300, wherein the area of the connecting area 300 is smaller than that of the naked electric core placing area 200, the liquid injection device 100 communicated with the naked electric core placing area 200 is arranged in the connecting area 300, and a naked electric core is placed in the naked electric core placing area 200;

packaging the aluminum-plastic film and the naked battery cell at one time to obtain a semi-finished battery cell;

and at least performing liquid injection and formation procedures on the semi-finished product battery cell, performing secondary packaging on the semi-finished product battery cell, and cutting the connecting area 300 and the liquid injection device 100 to obtain a soft package battery cell.

The processing method for processing the soft package battery cell comprises the following steps:

s1: preparing a naked electric core and at least one liquid injection device 100 (a plurality of liquid injection devices 100 can be arranged; when the liquid injection device 100 is a plurality of liquid injection devices, a plurality of liquid injection devices 100 can inject liquid, the liquid injection speed can be improved), two aluminum plastic films, a naked electric core placing area 200 and a connecting area 300 are divided on the two aluminum plastic films, the naked electric core is placed in the naked electric core placing area 200, a connecting pipe 10 of the liquid injection device 100 is placed in the connecting area 300, and a square structure with four side edges is assembled;

s2: packaging the four side edges of the square structure at one time to obtain a semi-finished product battery cell, wherein the semi-finished product battery cell is communicated with the outside through a connecting pipe 10;

s3: placing the semi-finished product battery cell into an oven for baking, performing a liquid injection procedure on the semi-finished product battery cell after the semi-finished product battery cell is baked, injecting electrolyte into the naked battery cell placement area 200 from at least one liquid injection device 100, and controlling the environmental temperature and humidity according to the battery cell process requirements;

s4: after liquid injection is finished, placing the semi-finished product battery cell into a high-temperature standing room for soaking, and controlling the environmental temperature and humidity according to the battery cell process requirements;

s5: after the infiltration is finished, carrying out a formation procedure on the semi-finished product battery cell, clamping the semi-finished product battery cell by a battery cell clamp, and carrying out battery cell activation under normal temperature and normal pressure environment or high temperature environment;

and S6, after the formation process and other subsequent processes are finished, secondarily packaging the semi-finished battery cell, cutting the connection area 300 along the separation line of the connection area 300 and the naked battery cell placement area 200, and secondarily packaging to obtain a finished product soft package battery cell.

According to the processing method of the battery cell, by adopting the liquid injection device 100, an air bag structure is not required to be arranged in the processing process of the battery cell, the area of the connecting area 300 is smaller, the using amount of an aluminum-plastic film can be reduced, and the material cost is reduced, so that the processing cost of the battery cell is reduced, the probability of electrolyte overflow and splashing is lower in the processing process, the quality of the battery cell can be improved, the liquid injection device 100 can be shared by a liquid injection process and a formation process, the cost of the liquid injection device 100 is lower, the liquid injection efficiency and the exhaust efficiency are higher, and the production efficiency of a soft package battery cell can be improved.

It should be noted that the connection area 300 is a "connection pipe 10 installation area" reserved on one side of the bare cell installation area, and only the connection area 300 with a small area needs to be reserved, so that the connection pipe 10 can be fixed without arranging an air bag structure.

Meanwhile, the liquid injection device 100 provided by the embodiment of the invention is suitable for a soft-package battery cell, and the liquid injection device 100 can be correspondingly and directly arranged on the side edge of the soft-package battery cell in the processing process of the soft-package battery cell.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the invention, "on" or "under" a first feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but are in contact via another feature between them.

In the description of the invention, "over," "above," and "on" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (14)

1. A priming device, comprising:

the connecting tube (10) is provided with a near end used for receiving electrolyte and a far end used for being packaged in a soft package electric core, and a liquid injection part and an air exhaust part are formed in the connecting tube (10);

the liquid injection part is used for guiding the electrolyte injected from the near end to the far end so as to inject liquid into the soft package battery cell;

the exhaust part is used for guiding the gas in the soft package battery core from the far end to the near end so as to exhaust the soft package battery core.

2. The liquid injection device according to claim 1, wherein the cross-sectional shape of the connecting pipe (10) is flat, and the width along the spreading direction of the flexible package core is larger than the thickness.

3. Priming device according to claim 1 or 2, characterized in that the proximal end of the connecting tube (10) is formed with a liquid receiving portion (13), the liquid receiving portion (13) being of funnel-shaped configuration.

4. The injection device according to claim 3, wherein the connecting tube (10) is further fixedly provided with a bonding glue (14), and the bonding glue (14) is close to the distal end; in with the connection region of connecting pipe (10), laminating glue (14) cladding in all surfaces of connecting pipe (10), the length of laminating glue (14) is greater than the width of connecting pipe (10), in order to incite somebody to action connecting pipe (10) encapsulation is in the plastic-aluminum membrane of soft package electricity core.

5. The filling device according to claim 1, wherein the filling portion is cut off outwards and/or the venting portion is cut off inwards.

6. The filling device according to claim 5, wherein the filling part is shut off outwards by a first one-way valve (20), and the first one-way valve (20) comprises: the valve body (21) is fixedly arranged on the connecting pipe (10), and the valve core (22) is movably arranged on the connecting pipe (10) and pushes against the valve body (21) from inside to outside; and/or

The exhaust section is inwardly blocked by a second check valve (30), the second check valve (30) comprising: the fixing plate (32) is arranged on one side, facing the far end, of the diaphragm (31), and the fixing plate (32) is provided with an exhaust hole used for fixing the diaphragm (31) and connected with the connecting pipe (10).

7. Priming device according to claim 6, characterized in that the connection tube (10) comprises: a liquid injection channel (11) and a gas exhaust channel (12) which are spaced apart, the liquid injection channel (11) being formed as the liquid injection part, the gas exhaust channel (12) being formed as the gas exhaust part.

8. Priming device according to claim 6, characterized in that the flow area of the vent channel (12) is smaller than the flow area of the priming channel (11).

9. Priming device according to claim 6, characterized in that the connecting tube (10) has a common channel (15), the common channel (15) being formed as a priming channel (11) during priming and as a venting channel (12) during venting, the venting part being integrated with the priming part in the common channel (15).

10. Priming device according to claim 9, characterized in that the second non return valve (30) is integrated in the first non return valve (20), at least part of the valve body (21) being formed as the fixing plate (32);

the first one-way valve (20) is adjacent to the distal end of the connecting tube (10) than the second one-way valve (30).

11. Priming device according to claim 10, characterized in that the membrane (31) is arranged obliquely to the fixing plate (32).

12. Priming device according to claim 10, characterized in that the valve slide (22) is spaced apart from the projection of the vent opening in the direction of extension of the connecting tube (10).

13. The injection device according to claim 1, wherein the injection device has a thickness less than the thickness of the flexible pouch cell.

14. A processing method of a battery cell is characterized by comprising the following steps:

dividing an aluminum plastic film into a naked electric core placing area and a connecting area, wherein the area of the connecting area is smaller than that of the naked electric core placing area, arranging at least one liquid injection device of any one of claims 1 to 13 communicated with the naked electric core placing area in the connecting area, and placing a naked electric core in the naked electric core placing area;

packaging the aluminum plastic film and the naked battery cell at one time to obtain a semi-finished battery cell;

and at least performing liquid injection and formation procedures on the semi-finished product battery cell, performing secondary packaging on the semi-finished product battery cell, and cutting the connecting area and the liquid injection device to obtain a soft package battery cell.

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