CN113451717A - Negative-pressure liquid injection device and method for effectively preventing battery deformation - Google Patents

Abstract

The invention discloses a negative pressure liquid injection device and a liquid injection method for effectively preventing a battery from deforming, wherein the liquid injection device comprises a base and an upper cover, the base is detachably and hermetically connected with the upper cover, a lower cavity is arranged in the base, an upper cavity is arranged in the upper cover, a battery limiting bracket is fixedly arranged in the lower cavity, the battery is limited and fixed in the battery limiting bracket, and a liquid injection port is arranged on the upper surface of the battery; the electrolyte injection component is communicated with the electrolyte injection port and is used for injecting electrolyte into the battery in the lower cavity; the pressure regulating assembly comprises a first pressure regulating assembly and a second pressure regulating assembly, the first pressure regulating assembly is communicated with the liquid injection port and used for regulating the gas pressure inside the battery, and the second pressure regulating assembly is communicated with the upper cavity and used for regulating the gas pressure outside the battery in the upper cavity. The invention ensures that the inside and the outside of the battery are in an isobaric environment during liquid injection, thereby avoiding the deformation of the battery and improving the yield of battery processing.

Description

Negative-pressure liquid injection device and method for effectively preventing battery deformation

Technical Field

The invention relates to the technical field of lithium battery processing, in particular to a negative-pressure liquid injection device and a liquid injection method for effectively preventing battery deformation.

Background

A lithium battery is a type of battery using a nonaqueous electrolyte solution, using lithium metal or a lithium alloy as a positive/negative electrode material. Lithium metal batteries were first proposed and studied by Gilbert n.lewis in 1912. In the 70 s of the 20 th century, m.s.whitetingham proposed and began to study lithium ion batteries. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. With the development of scientific technology, lithium batteries have become the mainstream.

With the increasingly wide application of lithium ion batteries in various fields, especially the gradual popularization in the fields of electric vehicles, new energy, military and the like, the research and development strength of various countries and large enterprises is increased, meanwhile, the preparation technology of advanced materials such as graphene and nano materials is continuously improved, the advanced materials are rapidly integrated with the research and development of lithium ion batteries, the innovation speed of the lithium ion battery industry is accelerated, various products are brought out and put on the market, and the development trend of the lithium ion battery industry is better and better.

After the lithium battery is baked, a battery liquid injection process is required; because the lithium battery absorbs the electrolyte slowly or even difficultly under natural conditions, the conventional electrolyte injection mode almost extracts a certain vacuum degree in the battery, so that the absorption of the electrolyte by the lithium battery is accelerated. However, this injection method: the air pressure intensity inside and outside is inconsistent in the battery liquid injection process, causes the battery deformation easily to lead to the defective products. The production efficiency is influenced, and the processing requirement of high-precision products cannot be met.

Disclosure of Invention

In order to solve the problems existing in the process of filling liquid into the lithium battery in the prior art, the invention provides a negative-pressure liquid filling device for effectively preventing the battery from deforming, and particularly provides the following technical scheme:

a negative pressure liquid injection device capable of effectively preventing a battery from deforming comprises a base and an upper cover, wherein the base is detachably and hermetically connected with the upper cover, a lower cavity is arranged in the base, an upper cavity is arranged in the upper cover, the upper cavity and the lower cavity can form a closed cavity, a battery limiting support is fixedly arranged in the lower cavity, the battery is limited and fixed in the battery limiting support, and a liquid injection port is formed in the upper surface of the battery; the electrolyte injection component is communicated with the electrolyte injection port and is used for injecting electrolyte into the battery in the lower cavity; the pressure regulating subassembly includes first pressure regulating subassembly and second pressure regulating subassembly, first pressure regulating subassembly with annotate the liquid mouth intercommunication for adjust the inside gas pressure of battery, the second pressure regulating subassembly with go up cavity body intercommunication, be used for adjusting the internal battery outside gas pressure of epicoele.

Furthermore, a buffer cup is fixedly arranged above the upper cover, the buffer cup is hermetically connected with the upper cover, a liquid injection connecting column is arranged at the lower end of the buffer cup, and the liquid injection connecting column is inserted into the upper cavity; be equipped with the buffer memory cavity in the buffer memory cup, the lower surface of buffer memory cavity is equipped with and runs through annotate the notes liquid hole of terminal surface about the liquid spliced pole, annotate the liquid hole with annotate liquid mouth intercommunication, the buffer memory cavity respectively with annotate the liquid subassembly with first pressure regulating subassembly intercommunication.

Furthermore, a mounting seat is fixedly arranged above the cache cup, the liquid injection assembly comprises a liquid injection hole arranged in the mounting seat, and the liquid injection hole is communicated with the cache cavity; be equipped with inlet channel in the mount pad, inlet channel with the buffer memory cavity intercommunication, first pressure regulating subassembly includes air inlet joint, air inlet joint fixes on the mount pad, be equipped with first inlet port in the air inlet joint, first inlet port with the inlet channel intercommunication.

Further, be equipped with on the mount pad and be used for the shutoff annotate the liquid stifled pole of annotating of liquid hole, it is located to annotate the liquid stifled pole directly over the liquid hole, the one end of annotating the liquid stifled pole is inserted in the buffer memory cavity, and the other end stretches out the upper surface of mount pad, the lower extreme tip of annotating the liquid stifled pole with annotate liquid hole adaptation.

Furthermore, the upper surface of the mounting seat is provided with a liquid injection blocking rod limiting groove, a liquid injection blocking head mounting hole penetrating through the mounting seat is formed in the liquid injection blocking rod limiting groove, and the lower end of the liquid injection blocking rod penetrates through the liquid injection blocking head mounting hole and then extends into the cache cavity; the mount pad is equipped with and covers annotate liquid sprue bar limiting plate of liquid sprue bar spacing groove, the upper end of annotating the liquid sprue bar passes annotate liquid sprue bar limiting plate, it is equipped with first reset spring to annotate the cover on the liquid sprue bar, the outer wall of annotating the liquid sprue bar is equipped with spacing lug, first reset spring's lower extreme with annotate liquid sprue bar spacing groove butt, the other end with spacing lug butt, spacing lug's upper surface with annotate liquid sprue bar limiting plate butt.

Furthermore, a pressing plate is arranged above the buffer cup, a liquid adding blocking rod for blocking the liquid adding hole is fixedly arranged on the lower surface of the pressing plate, and the end part of the lower end of the liquid adding blocking rod is matched with the liquid adding hole; the two ends of the upper cover are provided with supporting plates which are parallel to each other and are erected, the two ends of the pressing plate are provided with pressing plate limiting blocks, and the pressing plate limiting blocks are connected with the supporting plates in a sliding limiting mode.

Further, the second pressure regulating assembly comprises a second air inlet hole, the second air inlet hole is formed in the upper cover, and the second air inlet hole penetrates through the side wall of the upper cover and is communicated with the upper cavity.

Furthermore, at least two positioning holes are formed in the connecting side edge of the base and the upper cover, positioning pins are respectively arranged at the positions, corresponding to the positioning holes, on the upper cover, and the positioning pins can be inserted into the positioning holes.

Furthermore, first limiting blocks are respectively arrayed on the front side and the rear side of the base, second limiting blocks are respectively arranged at positions, corresponding to the first limiting blocks, on the upper cover, the upper side edge of each first limiting block is abutted against the lower side edge of each second limiting block, and two third limiting blocks are respectively arranged on the front side and the rear side of the upper cover; the locking device is used for locking the upper cover and the base and comprises a locking plate, and the locking plate is detachably connected with the first limiting block and the second limiting block in a limiting manner; the side of going up of jam plate is equipped with spacing, spacing can respectively with the third stopper butt, the internal surface of jam plate is equipped with the locking strip and lower locking piece, the lower side of going up the locking strip with the side butt of going up of second stopper, the last side of locking piece down with the lower side butt of first stopper.

In another aspect, the invention further provides a method for filling liquid into a battery by using the negative-pressure liquid filling device, which includes the following steps:

s1: respectively limiting and fixing the batteries on the battery limiting bracket;

s2: covering the upper cover on the base to seal the upper cavity and the lower cavity;

s3: the first pressure regulating assembly and the second pressure regulating assembly are used for respectively vacuumizing the interior and the upper cavity of the battery, and the pressure of gas inside and outside the battery is controlled to be the same;

s4: injecting electrolyte into the battery through the electrolyte injection assembly;

s5: injecting high-pressure gas into the battery and the upper cavity through the first pressure regulating assembly and the second pressure regulating assembly respectively;

s6: and circularly executing S3 and S5 until the electrolyte absorption is finished.

The invention is provided with the upper cavity and the lower cavity, so that the battery is positioned in a closed space for liquid injection operation. According to the invention, the first pressure regulating assembly is arranged to regulate the gas pressure in the battery, so that the battery can rapidly absorb electrolyte, and the electrolyte injection efficiency of the battery is improved; the second pressure regulating assembly is arranged to regulate the gas pressure in the upper cavity and the lower cavity, so that the inside and the outside of the battery are in an isobaric environment during liquid injection, the battery is prevented from deforming, and the yield of battery processing is improved.

Drawings

In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a three-dimensional structure of a locking state of an upper cover and a base in a negative pressure liquid injection device for effectively preventing battery deformation according to the present invention;

FIG. 2 is a schematic view of a three-dimensional structure of a negative pressure liquid injection device for effectively preventing battery deformation, wherein the upper cover and the base are in an open state;

FIG. 3 is a schematic front view of a locking state between an upper cover and a base of the negative pressure liquid injection device for effectively preventing battery deformation according to the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is an enlarged view of portion B of FIG. 4;

FIG. 6 is a schematic view of a connecting structure of the supporting plate and the pressing plate limiting block in the embodiment of the invention.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a negative pressure liquid injection device for effectively preventing battery deformation comprises a controller, a base 1 and an upper cover 2, wherein a lower cavity 11 is arranged in the base 1, and an upper cavity 21 is arranged in the upper cover 2; when the upper cover 2 covers the base 1, the upper cavity 21 and the lower cavity 11 can form a closed cavity. The internal fixation of cavity 11 is equipped with 5 spacing supports 12 of battery down, is equipped with 4 battery spacing grooves 13 in every battery spacing support 12, and the spacing fixing of battery 3 is in battery spacing groove 13, and the upper surface of battery 3 is equipped with annotates liquid mouth 31.

The left side and the right side of the upper surface of the base 1 are respectively provided with a positioning hole 14, the left side and the right side of the lower surface of the upper cover 2 are provided with a positioning pin 22 at the corresponding position of the positioning hole 14, and the positioning pins 22 can be inserted into the positioning holes 14 for limiting connection. The upper cover 2 is provided with 4 upper cover moving buttons 23 on the upper surface side, and the upper cover moving buttons 23 are distributed on the upper surface of the upper cover 2 in a rectangular shape. The front side and the rear side of the base 1 are respectively provided with 4 first limiting blocks 15 in an array mode, the upper cover 2 is provided with second limiting blocks 24 at positions corresponding to the first limiting blocks 15, and when the upper cover 2 covers the base 1, the upper side edges of the first limiting blocks 15 are respectively abutted to the lower side edges of the second limiting blocks 24.

The locking device 4 is used for locking the base 1 and the upper cover 2, the locking device 4 comprises a locking plate 41, locking push rods 42 are respectively arranged at the left end and the right end of the locking plate 41, two limiting strips 43 are arranged on the upper side edge of the locking plate 41, two third limiting blocks 25 are respectively arranged on the front side surface and the rear side surface of the upper cover 2, the third limiting blocks 25 are connected with the locking plate 41 in a sliding mode, and the third limiting blocks 25 are located between the two limiting strips 43; when the movable lock plate 41 moves rightward to the lock position, the left third stopper 25 can abut against the left stopper bar 43; when the movable lock plate 41 is moved leftward to the unlock position, the third stopper 25 on the right can abut against the stopper bar 43 on the right. The inner surface of the locking plate 41 is provided with an upper locking strip 44 and a lower locking piece 45, the lower side edge of the upper locking strip 44 is abutted against the upper side edge of the second limiting block 24, the number of the lower locking pieces 45 is the same as that of the first limiting block 15 and the second limiting block 24, and the upper side edge of the lower locking piece 45 can be abutted against the lower side edge of the first limiting block 15.

When the battery limiting device works, the batteries 3 are limited and fixed on the battery limiting bracket 12 until the batteries 3 are arranged in all the battery limiting grooves 13; through external equipment or manpower, the upper cover moving buckle 23 is grasped to lift the upper cover 2, the positioning pins 22 are respectively aligned to the positioning holes 14, the upper cover 2 is slowly put down, the positioning pins 22 are inserted into the positioning holes 14, and the upper cover 2 and the base 1 are folded; at this time, the first limiting block 15 abuts against the second limiting block 24 respectively, and then the locking push rod 42 at the left end of the locking plate 41 is pushed, so that the locking plate 41 is pushed rightward until the left limiting strip 43 abuts against the left third limiting block 25; at this time, the upper side edge of the lower lock block 45 just abuts against the lower side edge of the first limit block 15, so that the upper lock bar 44, the second limit block 24, the first limit block 15 and the lower lock block 45 abut against one another in sequence, and the relative position of the upper cover 2 and the base 1 is locked. When the upper cover 2 and the base 1 need to be unlocked, the locking plate 41 is pushed leftwards until the third limiting block 25 on the right abuts against the limiting strip 43 on the right, so that the lower locking block 45 is separated from the first limiting block 15, the upper cover 2 can be lifted, and the upper cover 2 is separated from the base 1.

The electrolyte injection component is communicated with the electrolyte injection port 31 and is used for injecting electrolyte into the battery 3 in the lower cavity 11; the pressure regulating assembly comprises a first pressure regulating assembly and a second pressure regulating assembly which are respectively connected with the controller, the first pressure regulating assembly is communicated with the liquid injection port 31 and used for regulating the gas pressure inside the battery 3, and the second pressure regulating assembly is communicated with the upper cavity 21 and used for regulating the gas pressure inside the upper cavity 21 (outside the battery).

When the battery is filled with liquid, the battery is positioned in a closed space formed by the upper cavity 21 and the lower cavity 11, and the first pressure regulating assembly is arranged to regulate the gas pressure inside the battery 3, so that the battery 3 can quickly absorb electrolyte, and the liquid filling efficiency of the battery 3 is improved; set up the second pressure regulating subassembly and can adjust the gas pressure in cavity 21 and cavity 11 down, make the inside of battery 3 be in under the isobaric environment with the outside to avoided battery 3 to take place deformation, improved the yields of battery 3 processing.

As shown in fig. 3-5, a buffer cup 5 is fixedly arranged above the upper cover 2, the buffer cup 5 is hermetically connected with the upper cover 2 through a screw, a liquid injection connection column 51 is arranged at the lower end of the buffer cup 5, and the liquid injection connection column 51 penetrates through the upper side wall of the upper cover 2 and then is inserted into the upper cavity 21. A buffer cavity 52 is arranged in the buffer cup 5, a conical liquid injection funnel 53 is arranged on the bottom surface of the buffer cavity 52, a liquid injection hole 54 penetrating through the upper end surface and the lower end surface of the liquid injection connecting column 51 is arranged at the center of the liquid injection funnel 53, and the liquid injection hole 54 is communicated with the liquid injection port 31 on the battery 3; wherein, the central axes of the liquid injection hole 54, the liquid injection funnel 53 and the buffer cavity 52 are superposed. The end part of the liquid injection connecting column 51 is sleeved with a liquid injection rubber sleeve 55, and the liquid injection rubber sleeve 55 is abutted to the liquid injection port 31; the liquid injection rubber sleeve 55 is arranged for preventing the liquid injection connecting column 51 from colliding with the battery 3 to damage the battery 3 or the liquid injection connecting column 51; on the other hand, the sealing property between the pouring outlet 31 and the pouring connecting column 51 is improved to prevent leakage.

The fixed mount pad 6 that is equipped with in top of buffer memory cup 5, annotate the liquid subassembly including setting up the liquid feeding hole 61 in mount pad 6, liquid feeding hole 61 and buffer memory cavity 52 intercommunication, liquid feeding hole 61 runs through the upper surface of mount pad 6. During operation, electrolyte is added into the buffer cavity 52 from the liquid adding hole 61, and then enters the battery 3 through the liquid injecting hole 54.

An air inlet channel 62 is arranged in the mounting seat 6, one end of the air inlet channel 62 is communicated with the cache cavity 52, and the other end of the air inlet channel 62 penetrates through the upper surface of the mounting seat 6. The first pressure regulating assembly comprises an air inlet joint 63, the air inlet joint 63 is fixed in the air inlet channel 62 and fixedly connected with the mounting seat 6, a first air inlet hole 64 is formed in the air inlet joint 63, and the first air inlet hole 64 is communicated with the air inlet channel 62. The second pressure regulating assembly comprises a second air inlet 26 arranged on the upper cover 2; in this embodiment, the second air inlet holes 26 are disposed on the left and right end surfaces of the upper cover 2, respectively penetrate through the side wall of the upper cover 2, and are communicated with the upper cavity 21. In other embodiments, the second air intake holes 26 may be disposed on the base 1 or other positions of the upper cover 2, or other numbers may be disposed, as long as the second air intake holes 26 are communicated with the upper cavity 21 or the lower cavity 11.

When the battery 2 works, the second air inlet 26 and the air inlet joint 63 are respectively connected with an external vacuumizing device and a high-pressure air source, high-pressure air is vacuumized or injected into the battery 3 and the upper cavity 21, and the pressure difference balance between the air in the battery 3 and the air in the upper cavity 21 (outside the battery) is controlled by the controller, so that the air pressure inside and outside the battery 2 is kept consistent.

The upper surface of mount pad 6 is equipped with annotates liquid gag lever post 65, annotates the interior notes liquid choke post mounting hole 66 that runs through mount pad 6 that is equipped with of liquid gag lever post 65, annotates the liquid gag lever post 7 that is equipped with in the liquid choke post mounting hole 66 and is used for the shutoff to annotate liquid hole 54, annotates liquid gag lever post 7 and is located annotate liquid hole 54 directly over, annotates in the lower extreme of liquid gag lever post 7 inserts buffer memory cavity 52, the upper surface that the mount pad 6 was stretched out to the other end. The lower end part of the liquid injection blocking rod 7 is sleeved with a plastic liquid injection plug 71, and the liquid injection plug 71 can also be made of other materials with certain elasticity; the liquid injection plug 71 is arranged, so that the liquid injection hole 54 has better sealing performance when needing to be plugged, and leakage is prevented. Be equipped with on mount pad 6 and cover notes liquid gag lever post limiting plate 67 of annotating liquid gag lever post 64, annotate the upper end of liquid gag lever post 7 and pass and annotate liquid gag lever post limiting plate 67, annotate the liquid gag lever post 7 and go up the cover and be equipped with first reset spring 72, the outer wall of annotating liquid gag lever post 7 is equipped with limiting convex block 73, the lower extreme of first reset spring 72 with annotate liquid gag lever post 65 butt, the other end and limiting convex block 73 butt, limiting convex block 73's upper surface with annotate liquid gag lever post limiting plate 67 butt.

When the liquid injection hole 54 needs to be blocked, the liquid injection blocking rod 7 is pressed downwards through external force, and the limiting convex block 73 extrudes the first return spring 72, so that the first return spring 72 is locked; the liquid injection blocking rod 7 slides downwards to make the liquid injection plug 71 block the liquid injection hole 54. When the liquid injection hole 54 needs to be opened, the external force on the liquid injection blocking rod 7 is released; under the action of the first return spring 72, the liquid injection blocking rod 7 is driven to slide upwards, so that the liquid injection plug 71 is separated from the liquid injection hole 54 until the limiting bump 73 abuts against the liquid injection blocking rod limiting plate 67.

A pressing plate 8 is arranged above the buffer cup 5, a liquid adding blocking rod 81 for blocking the liquid adding hole 61 is fixedly arranged on the lower surface of the pressing plate 8, the liquid adding blocking rod 81 is positioned right above the liquid adding hole 61, a plastic liquid adding plug 82 is sleeved at the lower end part of the liquid adding blocking rod 81, and the lower end part of the liquid adding plug 82 is matched with the liquid adding hole 61; in other embodiments, the filling plug 82 may also be made of other elastic materials; the arrangement of the liquid adding plug 82 can ensure that the liquid adding hole 61 is better in sealing property when needing to be plugged, and leakage is prevented. The both ends of upper cover 2 are equipped with the backup pad 9 that erects that is parallel to each other, and the both ends of clamp plate 8 are equipped with clamp plate stopper 83, and clamp plate stopper 83 slides with backup pad 9 and is spacing connected.

Specifically, as shown in fig. 6, a sliding groove 91 is arranged on the support plate 9, a buckle plate 92 is fixedly arranged on the support plate 9, a limit rod 93 is fixedly arranged at the end of the buckle plate 92, and the limit rod 93 is positioned inside the sliding groove 91; the lower end of the pressure plate stopper 83 slides in the slide groove 91, and the end is provided with a hook 84. When the pressing plate 8 is pressed downwards, the pressing plate limiting block 83 slides downwards until the end surface of the sliding groove 91 is abutted against the lower end surface of the hook 84; when the pressing plate 8 rises, the pressing plate stopper 83 slides upward until the stopper rod 93 abuts against the upper end surface of the hook 84. The pressure plate limiting block 83 is connected with the supporting plate 9 in a sliding limiting manner by arranging the hook 84, the limiting rod 93 and the sliding groove 91.

When the device works, when the liquid adding hole 61 needs to be sealed, the pressing plate 8 only needs to be pressed downwards until the lower end part of the hook 84 is abutted against the end face of the sliding groove 91; the liquid adding blocking rod 81 moves downwards, and the liquid adding hole 61 is blocked through the liquid adding blocking head 82. When liquid needs to be added, the pressing plate 8 is lifted upwards until the upper end surface of the hook 84 is abutted with the limiting rod 93; the filling block rod 81 moves upward to separate the filling block 82 from the filling hole 61.

The method for injecting the battery by adopting the negative-pressure injection device comprises the following specific steps:

firstly, the batteries 3 are respectively placed in the battery limiting grooves 13 until the batteries 3 are arranged in all the battery limiting grooves 13.

Secondly, grasping the upper cover moving buckle 23 to lift the upper cover 2 by external equipment or manpower, aligning the positioning pins 22 with the positioning holes 14 respectively, slowly lowering the upper cover 2, inserting the positioning pins 22 into the positioning holes 14, completing the folding of the upper cover 2 and the base 1, and sealing and closing the upper cavity 21 and the lower cavity 11; the upper cover 2 and the base 1 are fixed by using a locking device 4.

And thirdly, pressing down the pressing plate 8 to enable the liquid adding plug 82 to plug the liquid adding hole 61.

Fourthly, the second air inlet 26 and the air inlet joint 63 are respectively connected with a vacuum-pumping device to vacuum the interior of the battery 3 and the upper cavity 21 (the exterior of the battery), wherein the vacuum degree is controlled within-95 KPa; the balance of the vacuum degrees inside the battery 2 and the upper chamber body 21 (outside the battery) is controlled by the controller.

Fifthly, the liquid injection blocking rod 7 is pressed down, so that the liquid injection plug 71 blocks the liquid injection hole 54; the pressing plate 8 is lifted upwards, and the liquid adding hole 61 is opened; injecting a proper amount of electrolyte into the liquid adding hole 61, wherein the electrolyte flows into the cache cup 5 under the action of gravity; after the electrolyte is added, the pressing plate 8 is pressed down, so that the liquid adding plug 82 plugs the liquid adding hole 61; then, the liquid injection blocking rod 7 is pulled upwards, and the liquid injection hole 54 is opened; the electrolyte can flow into the liquid inlet 54 and enter the liquid inlet 31 into the battery 3.

Sixthly, the second air inlet 26 and the air inlet joint 63 are respectively connected with a high-pressure gas source, high-pressure gas is filled into the battery 3 and the upper cavity 21 (the outside of the battery), and the air pressure balance between the inside of the battery 3 and the upper cavity 21 (the outside of the battery) is controlled by the controller. In this embodiment, high pressure nitrogen is injected, wherein the pressure of the high pressure nitrogen is controlled to be 0.2-0.5 Mpa.

And a seventh step of executing the above-described "fourth step" and "sixth step" cyclically until all the electrolyte is absorbed by the battery 3.

It should be noted that the absorption of electrolyte into the battery can be accelerated by both the filling of high-pressure gas and the evacuation operation.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims (10)

1. The negative-pressure liquid injection device capable of effectively preventing the battery from deforming is characterized by comprising a base and an upper cover, wherein the base is detachably and hermetically connected with the upper cover, a lower cavity is arranged in the base, an upper cavity is arranged in the upper cover, the upper cavity and the lower cavity can form a closed cavity, a battery limiting support is fixedly arranged in the lower cavity, the battery is limited and fixed in the battery limiting support, and a liquid injection port is formed in the upper surface of the battery;

the electrolyte injection component is communicated with the electrolyte injection port and is used for injecting electrolyte into the battery in the lower cavity;

the pressure regulating subassembly includes first pressure regulating subassembly and second pressure regulating subassembly, first pressure regulating subassembly with annotate the liquid mouth intercommunication for adjust the inside gas pressure of battery, the second pressure regulating subassembly with go up cavity body intercommunication, be used for adjusting the internal battery outside gas pressure of epicoele.

2. The negative-pressure liquid injection device for effectively preventing the deformation of the battery according to claim 1, wherein a buffer cup is fixedly arranged above the upper cover, the buffer cup is hermetically connected with the upper cover, a liquid injection connecting column is arranged at the lower end of the buffer cup, and the liquid injection connecting column is inserted into the upper cavity;

be equipped with the buffer memory cavity in the buffer memory cup, the lower surface of buffer memory cavity is equipped with and runs through annotate the notes liquid hole of terminal surface about the liquid spliced pole, annotate the liquid hole with annotate liquid mouth intercommunication, the buffer memory cavity respectively with annotate the liquid subassembly with first pressure regulating subassembly intercommunication.

3. The negative-pressure liquid injection device capable of effectively preventing the deformation of the battery according to claim 2, wherein a mounting seat is fixedly arranged above the buffer cup, the liquid injection assembly comprises a liquid injection hole arranged in the mounting seat, and the liquid injection hole is communicated with the buffer cavity;

be equipped with inlet channel in the mount pad, inlet channel with the buffer memory cavity intercommunication, first pressure regulating subassembly includes air inlet joint, air inlet joint fixes on the mount pad, be equipped with first inlet port in the air inlet joint, first inlet port with the inlet channel intercommunication.

4. The negative-pressure liquid injection device for effectively preventing battery deformation according to claim 3, wherein a liquid injection blocking rod for blocking the liquid injection hole is arranged on the mounting seat, the liquid injection blocking rod is located right above the liquid injection hole, one end of the liquid injection blocking rod is inserted into the buffer cavity, the other end of the liquid injection blocking rod extends out of the upper surface of the mounting seat, and the end portion of the lower end of the liquid injection blocking rod is matched with the liquid injection hole.

5. The negative-pressure liquid injection device for effectively preventing the deformation of the battery according to claim 4, wherein a liquid injection blocking rod limiting groove is formed in the upper surface of the mounting seat, a liquid injection plug mounting hole penetrating through the mounting seat is formed in the liquid injection blocking rod limiting groove, and the lower end of the liquid injection blocking rod penetrates through the liquid injection plug mounting hole and then extends into the buffer cavity;

the mount pad is equipped with and covers annotate liquid sprue bar limiting plate of liquid sprue bar spacing groove, the upper end of annotating the liquid sprue bar passes annotate liquid sprue bar limiting plate, it is equipped with first reset spring to annotate the cover on the liquid sprue bar, the outer wall of annotating the liquid sprue bar is equipped with spacing lug, first reset spring's lower extreme with annotate liquid sprue bar spacing groove butt, the other end with spacing lug butt, spacing lug's upper surface with annotate liquid sprue bar limiting plate butt.

6. The negative-pressure liquid injection device capable of effectively preventing the deformation of the battery according to claim 5, wherein a pressing plate is arranged above the buffer cup, a liquid adding blocking rod for blocking the liquid adding hole is fixedly arranged on the lower surface of the pressing plate, and the lower end part of the liquid adding blocking rod is matched with the liquid adding hole;

the two ends of the upper cover are provided with supporting plates which are parallel to each other and are erected, the two ends of the pressing plate are provided with pressing plate limiting blocks, and the pressing plate limiting blocks are connected with the supporting plates in a sliding limiting mode.

7. The negative pressure liquid injection device for effectively preventing battery deformation as claimed in claim 1, wherein the second pressure regulating assembly comprises a second air inlet hole, the second air inlet hole is formed in the upper cover, and the second air inlet hole penetrates through a side wall of the upper cover and is communicated with the upper cavity.

8. The negative-pressure liquid injection device for effectively preventing battery deformation as claimed in claim 1, wherein at least two positioning holes are formed in the connecting side of the base and the upper cover, and positioning pins are respectively arranged on the upper cover at positions corresponding to the positioning holes and can be inserted into the positioning holes.

9. The negative-pressure liquid injection device capable of effectively preventing the deformation of the battery according to claim 1, wherein first limit blocks are respectively arrayed on the front side and the rear side of the base, second limit blocks are respectively arranged on the upper cover at positions corresponding to the first limit blocks, the upper side edge of the first limit block is abutted against the lower side edge of the second limit block, and two third limit blocks are respectively arranged on the front side and the rear side of the upper cover;

the locking device is used for locking the upper cover and the base and comprises a locking plate, and the locking plate is detachably connected with the first limiting block and the second limiting block in a limiting manner;

the side of going up of jam plate is equipped with spacing, spacing can respectively with the third stopper butt, the internal surface of jam plate is equipped with the locking strip and lower locking piece, the lower side of going up the locking strip with the side butt of going up of second stopper, the last side of locking piece down with the lower side butt of first stopper.

10. A method for filling a battery by using the negative pressure filling device for effectively preventing the battery from deforming as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:

s1: respectively limiting and fixing the batteries on the battery limiting bracket;

s2: covering the upper cover on the base to seal the upper cavity and the lower cavity;

s3: the first pressure regulating assembly and the second pressure regulating assembly are used for respectively vacuumizing the interior and the upper cavity of the battery, and the pressure of gas inside and outside the battery is controlled to be the same;

s4: injecting electrolyte into the battery through the electrolyte injection assembly;

s5: injecting high-pressure gas into the battery and the upper cavity through the first pressure regulating assembly and the second pressure regulating assembly respectively;

s6: and circularly executing S3 and S5 until the electrolyte absorption is finished.

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