CN111512475B - Liquid injection device and liquid injection method - Google Patents
Liquid injection device and liquid injection method Download PDFInfo
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- CN111512475B CN111512475B CN201880081820.4A CN201880081820A CN111512475B CN 111512475 B CN111512475 B CN 111512475B CN 201880081820 A CN201880081820 A CN 201880081820A CN 111512475 B CN111512475 B CN 111512475B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/673—Containers for storing liquids; Delivery conduits therefor
Abstract
Provided is a liquid injection device capable of reliably extracting gas in a bag-shaped film body. The liquid injection device (2) comprises: a nozzle (9) for injecting an electrolyte into the bag-shaped film body (4); and a sealing mechanism (10) which can press the bag-shaped film body inserted with the nozzle to seal the nozzle. The nozzle has an outer peripheral nozzle part (15), an inner peripheral nozzle part (16), and a shaft part (17) having a hollow part (17 b). The nozzle has: an electrolyte passage (19) through which an electrolyte flows; a decompression passage (28) formed by the hollow part of the shaft part and used for extracting gas in the bag-shaped film body; a 1 st valve (24) which can open and close a liquid injection port (20) which is an outlet of the electrolyte passage; and a 2 nd valve (25) which can open and close a suction port (29) which is an inlet of the decompression passage. In a state where the 1 st valve closes the liquid inlet, the shaft portion extends from the distal end portion of the inner peripheral nozzle portion toward the power generating element, and the 2 nd valve opens the suction port.
Description
Technical Field
The present invention relates to a liquid injection device and a liquid injection method for extracting gas in a bag-shaped coating body by using a nozzle inserted into the coating body.
Background
As a liquid injection device for performing vacuum pumping by inserting a nozzle for vacuum pumping into an opening of a bag-shaped laminate sheet for housing a power generation element, a liquid injection device described in patent document 1 is known.
In the liquid injection device of patent document 1, a nozzle for evacuation is provided separately from a nozzle for liquid injection, and these nozzles are inserted into an opening portion of a bag-shaped laminate.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2012-64468
Disclosure of Invention
The invention is toProblems to be solved
When the nozzle tip for evacuation is located at a position relatively distant from the power generating element when the liquid injection device is evacuated, adhesion of the laminate sheet occurs between the nozzle tip and the power generating element in association with evacuation, and there is a possibility that sufficient evacuation of the interior of the outer package body is difficult.
On the other hand, in the case where the tip end of the nozzle for evacuation is inserted deep into the vicinity of the power generating element during evacuation, the nozzle for evacuation needs to be withdrawn within a long distance range while keeping the nozzle pressed by the pair of seal units after evacuation, and therefore, there is a possibility that the sealing property of the bag-shaped laminate sheet is lowered.
The present invention has been made in view of the above problems, and provides an injection device and an injection method capable of reliably extracting gas in a bag-like film.
Means for solving the problems
The present invention for achieving the above object is an electrolyte injection device for injecting an electrolyte into a bag-shaped film body for housing power generation elements, the device including: a nozzle for injecting an electrolyte into the bag-shaped coating film body; and a sealing mechanism having an elastic body capable of pressing the bag-shaped film body into which the nozzle is inserted to seal the nozzle. The nozzle has: an outer peripheral nozzle portion sealable by the sealing mechanism; an inner peripheral nozzle portion movably housed in the outer peripheral nozzle portion; and a shaft portion which is movably housed inside the inner peripheral side nozzle portion and has a hollow portion. The nozzle has: an electrolyte passage formed between the outer peripheral side nozzle portion and the inner peripheral side nozzle portion and through which the electrolyte flows; and a pressure reducing passage formed in the hollow portion of the shaft portion and configured to draw out gas in the bag-shaped film body. The nozzle has: a 1 st valve disposed in the inner peripheral nozzle portion and configured to open and close a liquid inlet serving as an outlet of the electrolyte passage; and a 2 nd valve disposed on the shaft portion and configured to open and close a suction port that is an inlet of the pressure reducing passage. The inner peripheral side nozzle portion is configured such that a distal end portion, which is located on a distal end side when the inner peripheral side nozzle portion is inserted into the bag-shaped film body, is configured to be extendable and retractable with respect to the power generating element. The shaft portion is configured such that a distal end portion, which is located on a distal end side when the shaft portion is inserted into the bag-shaped film body from the inner peripheral side nozzle portion, is freely extendable and retractable with respect to the power generation element. In a state where the 1 st valve closes the liquid inlet, the shaft portion extends from the distal end portion of the inner peripheral side nozzle portion toward the power generation element, and the 2 nd valve opens the suction port.
The present invention for achieving the above object is an injection method for injecting an electrolyte into a bag-shaped film body for housing a power generating element through a nozzle. The nozzle is provided with: an outer peripheral side nozzle portion; an inner peripheral nozzle portion movably housed in the outer peripheral nozzle portion; and a shaft portion which is accommodated in the inner side nozzle portion so as to be movable, and which includes a hollow portion. In this injection method, the distal end portion of the outer peripheral nozzle portion is inserted into the opening of the bag-shaped coating body, and the outer peripheral nozzle portion and the bag-shaped coating body are sealed together by a sealing mechanism. Next, in a state where a liquid injection port, which is an outlet of an electrolyte passage formed by the hollow portion of the shaft portion, is closed, the shaft portion is extended from a distal end portion of the inner peripheral side nozzle portion toward the power generating element to open a suction port, which is an inlet of a decompression passage through which the electrolyte flows, the suction port being formed between the outer peripheral side nozzle portion and the inner peripheral side nozzle portion. Then, the gas in the bag-shaped film body is sucked out from the suction port through the decompression passage. Next, in a state where the suction port of the shaft portion is closed, the inner peripheral side nozzle portion is extended from a tip end portion of the outer peripheral side nozzle portion toward the power generating element to open the liquid inlet. Next, the electrolyte solution is injected into the bag-shaped film body from the injection port.
Drawings
Fig. 1 is a perspective view showing an injection device according to an embodiment.
Fig. 2 is an explanatory view showing a bag-like coating body in a state where a nozzle is inserted.
Fig. 3A is a cross-sectional view of the nozzle in the axial direction.
Fig. 3B is a cross-sectional view showing a portion a surrounded by a two-dot chain line in fig. 3A in an enlarged manner.
Fig. 4 is an explanatory view of the injection device as viewed from the front side of fig. 1.
Fig. 5 is a perspective view of an elastic body used in the main seal mechanism.
Figure 6 is a cross-sectional view of the injection device taken along line a-a of figure 1.
Fig. 7 is a perspective view of an elastic body used in the sub seal mechanism.
Fig. 8A is an explanatory diagram illustrating a step of evacuating the bag-shaped film body.
Fig. 8B is an explanatory diagram illustrating an injection step of injecting liquid into the bag-like coating body.
Fig. 8C is an explanatory view showing a sealing process of the bag-shaped film body after liquid injection.
Detailed Description
Hereinafter, embodiments will be described with reference to the attached drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. There are the following cases: the sizes and ratios of the components in the drawings are exaggerated and are different from the actual sizes and ratios for convenience of description.
Fig. 1 shows a liquid injection device 2 for injecting an electrolyte into a film-covered battery 1. The film covered battery 1 is, for example, a lithium ion secondary battery, and includes: a rectangular power generating element 3 in which a plurality of unshown positive and negative electrodes as electrodes and an unshown separator interposed therebetween are stacked (see fig. 2); a bag-shaped film body 4 that accommodates the power generating element 3 together with an electrolyte (see fig. 2); and a positive electrode tab 5 and a negative electrode tab 6 connected to the power generating element 3 (see fig. 2).
Here, the bag-like cover body 4 to be injected with liquid will be described. As shown in fig. 2, bag-shaped film body 4 is formed by overlapping two rectangular laminated films and heat-welding 3 sides 4a, 4b, and 4c so that positive electrode tab 5 is led out to the outside from 1 side 4a of bag-shaped film body 4 and negative electrode tab 6 is led out to the outside from side 4b of bag-shaped film body 4 parallel to side 4 a. In a state where the 3 sides 4a, 4b, and 4c are thermally welded, an opening 7 for injecting an electrolyte is formed in the upper side 4 d. The electrolyte solution is injected into the bag-like film body 4 containing the power generating element 3 from the opening 7.
To summarize, the liquid injection device 2 of the present embodiment includes: a nozzle 9 for injecting an electrolyte into the bag-shaped coating body 4; and a main sealing mechanism 10 (corresponding to a sealing mechanism) having an elastic body for pressing the bag-like coating body 4 into which the nozzle 9 is inserted to seal the nozzle 9. The nozzle 9 has: an outer peripheral side nozzle portion 15 which can be sealed by the main seal mechanism 10; an inner nozzle portion 16 movably housed in the outer nozzle portion 15; and a shaft portion 17 which is movably housed inside the inner peripheral side nozzle portion 16 and includes a hollow portion 17 b. The nozzle 9 has: an electrolyte passage 19 formed between the outer-peripheral-side nozzle portion 15 and the inner-peripheral-side nozzle portion 16 and through which electrolyte flows; and a pressure reducing passage 28 formed by the hollow portion 17b of the shaft portion 17 and used for extracting gas in the bag-like film body 4. The nozzle 9 has: a 1 st valve 24 disposed in the inner peripheral nozzle portion 16 and configured to open and close a liquid inlet 20 serving as an outlet of the electrolyte passage 19; and a 2 nd valve 25 disposed on the shaft portion 17 and configured to openably/closably open a suction port 29 serving as an inlet of the decompression passage 28. The inner peripheral side nozzle portion 16 is configured such that a distal end portion located on a distal end side when inserted into the bag-shaped film body 4 from the outer peripheral side nozzle portion 15 is freely extendable and retractable with respect to the power generating element 3. The shaft portion 17 is configured such that a distal end portion, which is located on a distal end side when the shaft portion is inserted into the bag-like film 4 from the inner peripheral side nozzle portion 16, is freely extendable and retractable with respect to the power generating element 3. In a state where the 1 st valve 24 closes the liquid inlet 20, the shaft portion 17 extends from the distal end portion of the inner peripheral nozzle portion 16 toward the power generating element 3, and the 2 nd valve 25 opens the suction port 29. In addition, in a state where the 2 nd valve 25 closes the suction port 29, the inner peripheral side nozzle portion 16 extends from the tip end portion of the outer peripheral side nozzle portion 15 toward the power generating element 3, and the 1 st valve 24 opens the liquid injection port 20. The structure of the injection device 2 will be described in detail below.
The liquid injection device 2 includes: a pressing jig 8 for holding the bag-like film-coated body 4 having the opening 7; a nozzle 9 for evacuating the inside of the bag-like coating body 4 and for injecting an electrolyte; a primary sealing mechanism 10 for pressing the opening 7 of the bag-shaped film body 4, into which the nozzle 9 is inserted, from both sides of the bag-shaped film body 4; a sub-sealing mechanism 11 (corresponding to the 2 nd sealing mechanism) for sealing the opening 7 of the bag-shaped film body 4 after the liquid injection; and a sealing mechanism 12 for heat-sealing the opening 7 of the bag-shaped film-coated body 4 after the liquid injection.
The pressing jig 8 is located below the main seal mechanism 10, the sub seal mechanism 11, and the seal mechanism 12, and is provided on a pressing jig fixing table 13. The pressing jig 8 has, for example, a rectangular parallelepiped shape, and is provided with an insertion hole 14 into which the bag-shaped film body 4 is inserted in a posture in which the opening 7 opens upward. As shown in fig. 1, in a state where the bag-like film 4 is inserted into the insertion hole 14, the upper portion of the bag-like film 4 on which the main seal mechanism 10, the sub-seal mechanism 11, and the closing mechanism 12 act protrudes upward from the upper surface 8a of the pressing jig 8.
The nozzle 9 is configured to be movable up and down, and as shown in fig. 3A and 3B, includes: a cylindrical outer peripheral nozzle portion 15; an inner circumferential nozzle portion 16 which is also cylindrical and extends and contracts so as to penetrate the outer circumferential nozzle portion 15; and a cylindrical shaft portion 17 that extends and contracts so as to penetrate the inner peripheral nozzle portion 16.
For convenience of explanation, a direction along a central axis M indicated by a one-dot chain line in fig. 3A and 3B is defined as an "axial direction", and the central axis M is a common central axis of the outer peripheral side nozzle portion 15, the inner peripheral side nozzle portion 16, and the shaft portion 17. The lower axial end side in fig. 3A is defined as "one axial end side", and the upper axial end side in fig. 3A is defined as "the other axial end side". The "one axial end side" is the tip side when the nozzle 9 is inserted into the bag-like coating body 4. The end portion on one end side in the axial direction of each member (the outer peripheral side nozzle portion 15, the inner peripheral side nozzle portion 16, and the shaft portion 17) constituting the nozzle 9 is defined as the tip end or the tip end portion of each member.
The outer peripheral nozzle 15 has an inner diameter larger than an outer diameter of the inner peripheral nozzle 16, and an annular electrolyte passage 19 through which an electrolyte flows is formed between the outer peripheral nozzle 15 and the inner peripheral nozzle 16 which extends and contracts relative to the outer peripheral nozzle 15. An annular liquid inlet 20 serving as an outlet of the electrolyte passage 19 is formed between the tip end of the outer peripheral side nozzle portion 15 and the outer peripheral surface of the inner peripheral side nozzle portion 16 in an extended state of the inner peripheral side nozzle portion 16 at one end side in the axial direction. The inner nozzle portion 16 has a 1 st valve 24 at its tip, and the liquid inlet 20 is opened and closed by the relative movement between the outer nozzle portion 15 and the inner nozzle portion 16. In a state where the liquid inlet 20 is closed, as shown in fig. 3B, a gap between the inclined surface 15a of the outer peripheral side nozzle portion 15, which is formed by expanding its diameter in a conical shape at one end in the axial direction, and the outer peripheral side inclined surface 24a of the 1 st valve 24 formed at the tip end of the inner peripheral side nozzle portion 16 is liquid-tightly sealed by an annular sealing member 26 for an electrolyte solution. The electrolyte solution sealing member 26 is provided in an annular groove formed in the outer peripheral side inclined surface 24a, and is formed of an elastic material, for example, rubber.
The electrolyte passage 19 extends from the injection port 20 toward the other end in the axial direction, and communicates with an electrolyte supply passage 21 formed by a protrusion 15c protruding cylindrically from the outer periphery of the outer peripheral nozzle 15. The electrolyte supply passage 21 is connected to an infusion pump 22 serving as a supply source of the electrolyte.
Further, two annular grooves 15d are formed in the inner peripheral surface of the outer peripheral nozzle portion 15 on the other axial end side of the outer peripheral nozzle portion 15, and annular seal members 23 are disposed in the annular grooves 15d, respectively. The sealing member 23 is formed of an elastic material such as rubber, and seals a gap between the inner peripheral surface of the outer peripheral side nozzle portion 15 and the outer peripheral surface of the inner peripheral side nozzle portion 16 in a liquid-tight and slidable manner.
The outer peripheral nozzle portion 15 has a protruding portion 15b that protrudes from the outer peripheral surface of the outer peripheral nozzle portion 15 toward the outer peripheral side so as to be orthogonal to the axial direction, at the other end side in the axial direction. The outer peripheral side nozzle portion 15 is lowered together with the inner peripheral side nozzle portion 16 and the shaft portion 17 by a pressing force from the rod 18a of the reciprocating linear motion type hydraulic actuator 18 connected to a hydraulic pump, not shown, acting on the projecting portion 15b in the axial direction from the other end side in the axial direction.
The inner nozzle 16 is formed in a cylindrical shape longer than the outer nozzle 15. The inner nozzle 16 is formed to have an inner diameter larger than an outer diameter of the shaft 17. In addition, the inner peripheral side nozzle portion 16 has two annular grooves 16c formed in the inner peripheral surface of the inner peripheral side nozzle portion 16 on the other axial end side, similarly to the outer peripheral side nozzle portion 15. Annular seal members 32 made of an elastic material, such as rubber, are disposed in the annular grooves 16 c. The sealing member 32 seals a gap between the inner peripheral surface of the inner peripheral side nozzle portion 16 and the outer peripheral surface of the shaft portion 17 in an airtight and slidable manner so that atmospheric air does not enter the bag-shaped coating body 4.
The inner peripheral side nozzle portion 16 has a projecting portion 16a projecting in the same direction as the projecting portion 15b of the outer peripheral side nozzle portion 15 at the other end side in the axial direction. A rod 27a of a reciprocating linear motion type hydraulic actuator 27 supported by the extension portion 15b is connected to the extension portion 16 a. The inner nozzle portion 16 is relatively moved in the axial direction with respect to the outer nozzle portion 15 by the rod 27a of the hydraulic actuator 27.
The shaft portion 17 is formed in a cylindrical shape longer than the inner peripheral nozzle portion 16. The shaft portion 17 forms an annular decompression passage 28 through which gas flows during evacuation by the hollow portion 17 b. A suction port 29 serving as an inlet of the decompression passage 28 is formed at a distal end portion of the shaft portion 17 located on a distal end side when inserted into the bag-like film body 4. The suction port 29 is formed by a through hole 17c formed in the peripheral wall of the shaft portion 17. The shaft portion 17 has a circular truncated cone-shaped 2 nd valve 25 at its tip, and the suction port 29 is opened and closed by relative movement between the inner side nozzle portion 16 and the shaft portion 17. In a state where the suction port 29 is closed, as shown in fig. 3A and 3B, a gap between the inner peripheral side inclined surface 24B of the 1 st valve 24 provided in the inner peripheral side nozzle portion 16 and the tapered surface 25a of the 2 nd valve 25 provided at the distal end of the shaft portion 17 is hermetically sealed by an annular gas seal member 33. The gas seal member 33 is housed in an annular groove formed in the tapered surface 25a, and is formed of rubber in the same manner as the electrolyte seal member 26.
The decompression passage 28 extends from the suction port 29 toward the other end side in the axial direction so as to be longer than the length of the electrolyte passage 19. The pressure reducing passage 28 communicates with a gas discharge passage 30, and the gas discharge passage 30 is connected to the other axial end side of the shaft portion 17. The gas discharge passage 30 is connected to a vacuum pump 31.
The shaft portion 17 has an extension portion 17a formed on the other end side in the axial direction in the same manner as the extension portions 15b and 16a, and a rod 34a of a reciprocating linear motion type hydraulic actuator 34 supported by the extension portion 16a is connected to the extension portion 17 a. The shaft portion 17 is relatively moved in the axial direction with respect to the inner peripheral side nozzle portion 16 by the driving of the rod 34a of the hydraulic actuator 34.
As shown in fig. 1, the main seal mechanism 10 is provided below the closing mechanism 12, and is configured to press both surfaces of the bag-shaped film body 4 with the nozzles 9 inserted therein to seal the outer-peripheral-side nozzle portion 15. The main seal mechanism 10 includes a pair of elastic bodies 35, 36 for sealing the outer peripheral side nozzle portion 15, and a pair of holding members 37, 38 for holding the pair of elastic bodies 35, 36.
As shown in fig. 4, the elastic body 35 is provided on one side (the right side in fig. 4) with the bag-like coating body 4 interposed therebetween, and is configured to press the opening 7 together with the nozzle 9 from both sides of the bag-like coating body 4 in cooperation with the elastic body 36, thereby sealing the outer-peripheral-side nozzle portion 15 along a sealing line L1 (see fig. 2) crossing the nozzle 9. The elastic body 35 is formed of rubber, such as fluororubber, as an elastic material. The elastic body 35 is formed into an elongated rod shape having a circular cross section and has a length enough to seal the opening 7 of the upper side 4d of the bag-like film body 4. As shown in fig. 5, the elastic body 35 is provided at its central portion with a semi-arc shaped bent portion 39 recessed along the outer diameter of the outer peripheral nozzle portion 15 of the nozzle 9. As shown in fig. 6, the bent portion 39 is formed to have a size enough to appropriately press the outer peripheral nozzle portion 15 and the portion of the bag-shaped coating body 4 along the outer peripheral nozzle portion 15 when the opening 7 is pressed together with the outer peripheral nozzle portion 15 from the outside of the bag-shaped coating body 4.
The holding member 37 is formed of, for example, metal, and has a substantially U-shaped cross section as shown in fig. 4. The holding member 37 includes a bottom wall 37a standing vertically and a pair of side walls 37b and 37b extending in parallel to each other from the bottom wall 37a in the horizontal direction. An elastic body 35 is housed in a groove 37c formed by a bottom wall 37a and a pair of side walls 37b, and the elastic body 35 is thermally welded or bonded. Further, a notch portion 37d shown in fig. 6 having a shape corresponding to the bent portion 39 of the elastic body 35 is formed in the pair of side walls 37b, 37b so as to avoid interference with the outer peripheral side nozzle portion 15.
The elastic body 36 is provided on the other side (left side in fig. 4) with the bag-like cover body 4 interposed therebetween as shown in fig. 4. The elastic body 36 is formed of rubber having a higher hardness than that of the elastic body 35, such as silicone rubber, into a flat sheet shape.
The holding member 38 is formed of, for example, metal. As shown in fig. 4, the holding member 38 has a rectangular parallelepiped shape, and the elastic body 36 is thermally welded or bonded to the surface thereof.
As shown in fig. 1, the main seal mechanism 10 is provided at a position of a seal line L1 shown in fig. 2, and includes two hydraulic actuators 40 and 50. These hydraulic actuators 40 and 50 are configured to reciprocate the elastic bodies 35 and 36 linearly independently of the bag-like cover body 4. As shown in fig. 4, the hydraulic actuator 40 is coupled to the bottom wall 37a of the holding member 37 via a rod 40a, while, as shown in fig. 4, the hydraulic actuator 50 is coupled to the holding member 38 via a rod 50 a. The hydraulic actuator 40 and the hydraulic actuator 50 are operated in conjunction with each other to open and close the elastic bodies 35 and 36 located on both sides with the opening 7 interposed therebetween.
The sub-seal mechanism 11 is provided at a position closer to the power generating element 3 than the main seal mechanism 10, that is, at a position of a seal line L2 shown in fig. 2, and is configured to seal the opening 7 without interposing the nozzle 9 therebetween after the liquid injection step, thereby suppressing leakage of the electrolyte and entry of outside air. The sub-seal mechanism 11 includes a pair of elastic bodies 41 and 42 for sealing the opening 7, and a pair of holding members 43 and 44 for holding the pair of elastic bodies 41 and 42.
As shown in fig. 4, the elastic body 41 is provided at a position below the elastic body 35 on one side (right side in fig. 4) with the bag-like cover body 4 interposed therebetween, and is configured to press the opening 7 from both sides of the bag-like cover body 4 in cooperation with the elastic body 42, thereby sealing the opening 7 along a seal line L2 (see fig. 2). The elastic body 41 is formed of the same rubber as the elastic body 35, for example, fluororubber, and has the same hardness as that of the elastic body 35. As shown in fig. 7, the elastic body 41 is formed in an elongated cylindrical shape and has a length enough to seal the opening 7 of the upper side 4d of the bag-like film body 4, similarly to the elastic body 35.
The holding member 43 is formed of, for example, metal and has a substantially U-shaped cross section as shown in fig. 4. The holding member 43 has a structure similar to that of the holding member 37, and the elastic body 41 is accommodated in a groove 43c formed by a bottom wall 43a and a pair of side walls 43b and 43b, and the elastic body 41 is thermally welded or bonded.
The elastic body 42 is formed in a flat sheet shape from the same rubber as the elastic body 36.
The holding member 44 has a rectangular parallelepiped shape as in the holding member 38, and the elastic body 42 is thermally welded or bonded to the surface thereof.
As shown in fig. 1, the sub seal mechanism 11 includes two hydraulic actuators 45 and 51. The elastic bodies 41 and 42 located on both sides with the opening 7 therebetween are opened and closed by driving the rods 45a and 51a (see fig. 4) of the hydraulic actuators 45 and 51.
The sealing mechanism 12 includes a pair of sealing heaters 46 and 46 for heat-sealing the opening 7 of the bag-shaped film body 4 after the electrolyte solution is injected. The pair of blocking heaters 46 and 46 are substantially the same in structure. As shown in fig. 1, the closing heater 46 is located above the main seal mechanism 10. The blocking heater 46 is formed in a block shape and made of, for example, a metal material having excellent thermal conductivity. The blocking heater 46 is provided with a heating element such as a hot wire inside. The pair of blocking heaters 46 and 46 are connected to actuators, not shown, respectively, and are configured to be opened and closed via the opening 7.
In this liquid injection device 2, as shown in fig. 1, the bag-like coating body 4 is inserted into the insertion hole 14 in a posture in which the opening 7 is opened upward, and then the nozzle 9 is lowered by driving the hydraulic actuator 18 to insert the tip end portion of the nozzle 9 into the opening 7. Next, the pair of elastic bodies 35 and 36 are moved closer to each other by the hydraulic actuators 40 and 50, and the bag-shaped film body 4 into which the nozzle 9 is inserted is pressed from both sides by the elastic bodies 35 and 36. Thereby, the outer peripheral nozzle portion 15 is sealed together with the bag-shaped cover 4 by the elastic bodies 35, 36.
Next, the evacuation step, the liquid injection step, and the sealing step after the liquid injection of the bag-like film 4 will be described with reference to fig. 8A to 8C.
In fig. 8A to 8C, the nozzle 9 is inserted into the bag-like coating body 4, and the elastic bodies 35 and 36 of the bag-like coating body 4 into which the outer-peripheral nozzle portion 15 is inserted are pressed from both sides at the position of the seal line L1 (see fig. 2) by broken lines. In fig. 8C, the elastic bodies 41 and 42 sealing the bag-like film body 4 are shown by a one-dot chain line at the position of the seal line L2 (see fig. 2).
As shown in fig. 8A, in the vacuum-pumping step, with the 1 st valve 24 closing the liquid inlet 20, the shaft portion 17 extends from the distal end portion of the inner peripheral nozzle portion 16 toward the power generating element 3, and the 2 nd valve 25 opens the suction port 29.
Specifically, the inner nozzle portion 16 is retracted upward by the drive of the hydraulic actuator 27. By the retreat of the inner peripheral side nozzle portion 16, the liquid inlet 20 of the outer peripheral side nozzle portion 15 is closed by the 1 st valve 24 of the inner peripheral side nozzle portion 16. The gap between the inclined surface 15a and the outer peripheral inclined surface 24a is liquid-tightly sealed by the electrolyte solution sealing member 26.
Then, with the liquid inlet 20 kept closed by the 1 st valve 24, the shaft portion 17 is extended from the distal end portion of the inner peripheral side nozzle portion 16 toward the power generating element 3 by the drive of the hydraulic actuator 34. The shaft portion 17 protrudes toward one axial end side with respect to the inner peripheral side nozzle portion 16. After the shaft portion 17 protrudes, the 2 nd valve 25 is in a state where the suction port 29 is opened. In this way, the suction port 29 opens into the bag-like cover body 4 at a position projecting toward one axial end side from the tip end portion of the inner peripheral nozzle portion 16 in a state where the liquid pouring port 20 is closed. In the protruded position, the 2 nd valve 25 is located near the end edge of the power generating element 3.
Next, with the liquid inlet 20 kept closed by the 1 st valve 24, the vacuum pump 31 is operated to evacuate the gas in the bag-like film body 4 through the suction port 29 and the pressure reducing passage 28 as shown by the arrow G in fig. 8A, i.e., to evacuate the same.
As shown in fig. 8B, in the liquid injection step, which is a step subsequent to the evacuation step, the inner nozzle portion 16 is extended from the distal end portion of the outer nozzle portion 15 toward the power generating element 3 in a state where the 2 nd valve 25 closes the suction port 29, and the 1 st valve 24 opens the liquid injection port 20.
Specifically, first, the shaft portion 17 is retracted upward from the axial position shown in fig. 8A with respect to the inner nozzle portion 16 by the driving of the hydraulic actuator 34. Thereby, as shown in fig. 8B, the suction port 29 is closed by the 2 nd valve 25, and the gap between the tapered surface 25a and the inner peripheral side inclined surface 24B is hermetically sealed by the gas sealing member 33.
Next, the inner nozzle portion 16 is extended from the distal end of the outer nozzle portion 15 toward the power generating element 3 by the drive of the hydraulic actuator 27 while the suction port 29 is kept closed by the 2 nd valve 25. The inner nozzle portion 16 protrudes toward one axial end side with respect to the outer nozzle portion 15. After the inner nozzle portion 16 is projected, the 1 st valve 24 opens the liquid inlet 20. Thus, the liquid inlet 20 is annularly opened between the tip end of the outer nozzle 15 and the outer peripheral surface of the inner nozzle 16 in a state where the suction port 29 is closed. The 1 st valve 24 is located at a position projecting toward one axial end side from the liquid inlet 20.
Next, the liquid-filling pump 22 is operated with the suction port 29 closed by the 2 nd valve 25, and the electrolyte liquid is filled into the bag-like coating body 4 through the electrolyte liquid passage 19 and the liquid-filling port 20 as shown by an arrow L in fig. 8B.
As shown in fig. 8C, in the sealing step which is a step subsequent to the injection step, the inner nozzle portion 16 is retracted upward from the axial position shown in fig. 8B together with the shaft portion 17 by driving of the hydraulic actuator 27. The liquid inlet 20 is closed by the 1 st valve 24 by the backward movement of the inner peripheral side nozzle portion 16. The gap between the inclined surface 15a and the outer peripheral inclined surface 24a is liquid-tightly sealed by the electrolyte solution sealing member 26.
Next, with the liquid inlet 20 and the suction port 29 closed, the opening 7 of the bag-like cover body 4 is sealed by the pair of elastic bodies 41 and 42 at the position of the sealing line L2.
Next, the pair of elastic bodies 35 and 36 are separated from the bag-shaped coating body 4 with the opening 7 of the bag-shaped coating body 4 sealed with the pair of elastic bodies 41 and 42 kept, and then the nozzle 9 is drawn out from the opening 7.
Next, in a heat-sealing step which is a step subsequent to the sealing step of fig. 8C, the bag-like film body 4 is heated from both sides by the pair of sealing heaters 46, 46 at a position above the sealing line L1 shown in fig. 2. Thereby, the bag-like film body 4 is heat-sealed along the upper side 4d shown in fig. 2.
As described above, in the present embodiment, when the bag-like film body 4 is evacuated, the shaft portion 17 is extended from the distal end portion of the inner peripheral side nozzle portion 16 toward the power generating element 3 in a state where the 1 st valve 24 closes the liquid inlet 20, and the 2 nd valve 25 opens the suction port 29. In other words, the shaft portion 17 is deeply inserted into the vicinity of the power generating element 3 in the bag-shaped film body 4, and the suction port 29 is located in the vicinity of the end edge of the power generating element 3. Therefore, during evacuation, the shaft portion 17 extends into the bag-shaped film body 4, and the suction port 29 is located near the end edge of the power generating element 3, so that the inside of the bag-shaped film body 4 can be reliably evacuated through the suction port 29.
Since the pouring port 20 is closed during evacuation, the electrolyte remaining in the electrolyte passage 19 is prevented from flowing into the pressure reducing passage 28. This stabilizes the amount of electrolyte solution injected into the bag-like film 4. Further, the electrolyte does not splash toward the vacuum pump 31, and the failure of the vacuum pump 31 can be reduced. Further, since the hollow portion 17b of the shaft portion 17 is used as the decompression passage 28, the structure of the nozzle 9 can be simplified, and the nozzle 9 can be downsized.
Further, if the nozzle is formed of a single tube, when the nozzle is inserted deeply into the bag-shaped coating body and vacuumized, the nozzle needs to be drawn out over a long distance after vacuuming, and the sealing property of the bag-shaped coating body by the pair of elastic bodies sealing the nozzle may be reduced.
However, in the present embodiment, it is sufficient that the outer-peripheral-side nozzle portion 15 sealed by the elastic bodies 35, 36 is not deeply inserted into the bag-shaped coating body 4, and therefore, a decrease in the sealing performance of the bag-shaped coating body 4 when the nozzle 9 is extracted can be suppressed.
In the present embodiment, in the liquid injection step, the inner nozzle portion 16 is extended from the distal end portion of the outer nozzle portion 15 toward the power generating element 3 in a state where the 2 nd valve 25 closes the suction port 29, and the 1 st valve 24 opens the liquid injection port 20. This reliably blocks the electrolyte passage 19 and the pressure reducing passage 28 during injection.
In the present embodiment, the suction port 29 is formed at the distal end of the shaft portion 17 that is located on the distal end side when inserted into the bag-like film 4. This allows the suction port 29 to be easily positioned near the end edge of the power generating element 3, and the inside of the bag-shaped film body 4 to be reliably evacuated through the suction port 29. Since the distance between the suction port 29 and the 2 nd valve 25 is also small, the bag-like coating body 4 does not come into close contact with the suction port 29 during evacuation, and the blockage of the decompression passage 28 can be prevented.
In the present embodiment, the liquid filling device 2 includes two sealing mechanisms including the main sealing mechanism 10 and the sub sealing mechanism 11, and after evacuation, the sealing by the pair of elastic bodies 35 and 36 is released in a state where the opening 7 of the bag-like cover body 4 is sealed by the pair of elastic bodies 41 and 42, and then the nozzle 9 is drawn out from the opening 7. This ensures the sealing property of the bag-shaped coating body 4 by the pair of elastic bodies 41 and 42, and thus suppresses the reduction in the sealing property of the bag-shaped coating body 4 when the nozzle 9 is pulled out.
In the present embodiment, since the nozzle sealed by the elastic bodies 35 and 36 is only one nozzle of the outer peripheral nozzle portion 15, the outer peripheral nozzle portion 15 can be easily extracted as compared with a case where a single liquid injection nozzle and a single vacuum nozzle sealed by a pair of elastic bodies are extracted.
In the above-described embodiment, the bag-shaped film body 4 in which two rectangular laminated films are superimposed on each other and three sides are heat-welded was described as an example, but the bag-shaped film body used in the present invention may be configured by folding 1 rectangular laminated film in two and heat-welding two sides orthogonal to the folded side.
In the above embodiment, the film-covered battery 1 in which the positive electrode lead 5 is led out to the outside from 1 side 4a of the bag-shaped film body 4 and the negative electrode lead 6 is led out to the outside from the side 4b has been described, but the film-covered battery 1 in which both the positive electrode lead 5 and the negative electrode lead 6 are led out from 1 side can also be applied to the present invention.
In the above embodiment, the example in which the bag-shaped film body 4 is disposed in the posture in which the opening 7 of the bag-shaped film body 4 is opened upward is disclosed, but the bag-shaped film body 4 may be disposed in another posture.
In the above embodiment, the decompression passage 28 is constituted only by the hollow portion 17b of the shaft portion 17, but the present invention is not limited to this case. For example, the decompression passage 28 can be formed by both the space formed between the inner periphery of the inner periphery side nozzle portion 16 and the outer periphery of the shaft portion 17 and the hollow portion 17b of the shaft portion 17. In this case, the vacuum pump 31 is communicated with a space formed between the inner periphery of the inner periphery side nozzle portion 16 and the outer periphery of the shaft portion 17. The gas in the bag-like film body 4 is sucked by the vacuum pump 31 through the suction port 29, the hollow portion 17b of the shaft portion 17, and the space.
Description of the reference numerals
2. A liquid injection device; 4. a bag-shaped film-coated body; 9. a nozzle; 10. a main seal mechanism (seal mechanism); 11. a sub-seal mechanism (2 nd seal mechanism); 15. an outer peripheral side nozzle portion; 16. an inner peripheral side nozzle portion; 17. a shaft portion; 17b, a hollow portion; 17c, a through hole; 19. an electrolyte passage; 20. a liquid injection port; 24. a 1 st valve; 25. a 2 nd valve; 28. a pressure reducing passage; 29. a suction inlet.
Claims (5)
1. A liquid injection device for injecting an electrolyte into a bag-shaped film body for housing a power generation element,
the liquid injection device comprises:
a nozzle for injecting the electrolyte into the bag-shaped coating film body; and
a sealing mechanism having an elastic body capable of pressing the bag-shaped film body into which the nozzle is inserted to seal the nozzle,
the nozzle has:
an outer peripheral nozzle portion sealable by the sealing mechanism;
an inner peripheral nozzle portion movably housed in the outer peripheral nozzle portion;
a shaft portion which is movably housed inside the inner peripheral side nozzle portion and has a hollow portion;
an electrolyte passage formed between the outer peripheral side nozzle portion and the inner peripheral side nozzle portion and through which the electrolyte flows;
a decompression passage formed in the hollow portion of the shaft portion and configured to evacuate gas from the bag-shaped film body;
a 1 st valve disposed in the inner peripheral nozzle portion and configured to open and close a liquid inlet serving as an outlet of the electrolyte passage; and
a 2 nd valve disposed on the shaft portion and having an inlet port serving as an inlet of the pressure reducing passage openable and closable,
the inner peripheral side nozzle portion is configured such that a distal end portion, which is located on a distal end side when the inner peripheral side nozzle portion is inserted into the bag-shaped film body, is freely extendable and retractable with respect to the power generating element,
the shaft portion is configured such that a distal end portion, which is located on a distal end side when the shaft portion is inserted into the bag-shaped film body from the inner peripheral side nozzle portion, is freely extendable and retractable with respect to the power generating element,
in a state where the 1 st valve closes the liquid inlet, the shaft portion extends from a tip end portion of the inner peripheral side nozzle portion toward the power generating element, and the 2 nd valve opens the suction port.
2. The injection device of claim 1,
in a state where the 2 nd valve closes the suction port, the inner peripheral side nozzle portion extends from a tip end portion of the outer peripheral side nozzle portion toward the power generation element, and the 1 st valve opens the liquid injection port.
3. The priming device of claim 1 or 2,
the suction port is formed at a distal end portion of the shaft portion that is located on a distal end side when the shaft portion is inserted into the bag-shaped film body.
4. The liquid injection device according to any one of claims 1 to 3,
the liquid injection device further includes a 2 nd sealing mechanism, the 2 nd sealing mechanism being located closer to the power generating element than the sealing mechanism and having an elastic body.
5. A liquid injection method for injecting an electrolyte into a bag-shaped film body for housing a power generation element through a nozzle,
the nozzle is provided with: an outer peripheral side nozzle portion; an inner nozzle portion movably housed inside the outer nozzle portion; and a shaft portion movably housed in the inner peripheral side nozzle portion and having a hollow portion,
in the liquid injection method, in the case of the liquid injection method,
inserting the tip end portion of the outer peripheral nozzle portion into the opening of the bag-shaped film body,
the outer peripheral nozzle portion is sealed together with the bag-shaped coating body by a sealing mechanism,
extending the shaft portion from a tip end portion of the inner peripheral side nozzle portion toward the power generating element in a state where a liquid injection port, which is an outlet of an electrolyte passage formed by the hollow portion of the shaft portion, is closed to open a suction port, which is an inlet of a decompression passage through which the electrolyte flows, formed between the outer peripheral side nozzle portion and the inner peripheral side nozzle portion,
drawing out gas in the bag-like coating body from the suction port through the decompression passage,
extending the inner peripheral side nozzle portion from a tip end portion of the outer peripheral side nozzle portion toward the power generating element to open the liquid inlet in a state where the suction port of the shaft portion is closed,
and injecting the electrolyte into the bag-shaped film body from the injection port.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/007732 WO2019167219A1 (en) | 2018-03-01 | 2018-03-01 | Liquid injection device and liquid injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111512475A CN111512475A (en) | 2020-08-07 |
| CN111512475B true CN111512475B (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880081820.4A Active CN111512475B (en) | 2018-03-01 | 2018-03-01 | Liquid injection device and liquid injection method |
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| Country | Link |
|---|---|
| JP (1) | JP7002631B2 (en) |
| CN (1) | CN111512475B (en) |
| WO (1) | WO2019167219A1 (en) |
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| CN112688033B (en) * | 2020-12-25 | 2022-11-11 | 惠州亿纬锂能股份有限公司 | Cylindrical battery cell liquid injection device and liquid injection method |
| CN112736377A (en) * | 2021-02-05 | 2021-04-30 | 宁波久鼎新能源科技有限公司 | Soft package lithium battery liquid injection port sealing structure and manufacturing method thereof |
| CN113948832B (en) * | 2021-09-02 | 2024-03-19 | 东莞市诺源新材料科技有限公司 | Electrolyte raw material multi-control injection system |
| JP7437834B1 (en) | 2023-09-29 | 2024-02-26 | 株式会社ワイ・ジー・ケー | Liquid injection device and injection method |
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| JPH11219698A (en) * | 1997-11-26 | 1999-08-10 | Sony Corp | Method and device for injecting electrolytic solution |
| JP2009146866A (en) * | 2007-12-18 | 2009-07-02 | Toyota Motor Corp | Electrolyte filling device |
| JP5644306B2 (en) * | 2010-09-16 | 2014-12-24 | 日産自動車株式会社 | Electrolyte injection method and electrolyte injection device |
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2018
- 2018-03-01 WO PCT/JP2018/007732 patent/WO2019167219A1/en active Application Filing
- 2018-03-01 CN CN201880081820.4A patent/CN111512475B/en active Active
- 2018-03-01 JP JP2020503204A patent/JP7002631B2/en active Active
Patent Citations (6)
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| JPH08130004A (en) * | 1994-09-05 | 1996-05-21 | Fuji Elelctrochem Co Ltd | Decompression filling method for cylindrical battery and equipment |
| JPH09167612A (en) * | 1995-12-18 | 1997-06-24 | Matsushita Electric Ind Co Ltd | Filling device of electrolyte for battery |
| CN1421248A (en) * | 2001-11-28 | 2003-06-04 | 萨克哈拉姆D.马赫卡 | Disposible safety syringe with improved retractable needle |
| JP2008204649A (en) * | 2007-02-16 | 2008-09-04 | Furukawa Battery Co Ltd:The | Electrolytic solution injector for storage battery, and electrolytic solution injection method to storage battery |
| CN102035042A (en) * | 2009-09-30 | 2011-04-27 | 三洋电机株式会社 | Method for manufacturing sealed battery |
| JP2012064468A (en) * | 2010-09-16 | 2012-03-29 | Nissan Motor Co Ltd | Electrolyte injection method and electrolyte injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111512475A (en) | 2020-08-07 |
| WO2019167219A1 (en) | 2019-09-06 |
| JPWO2019167219A1 (en) | 2021-02-04 |
| JP7002631B2 (en) | 2022-01-20 |
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