Battery cell liquid injection assembly and battery cell liquid injection forming device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cell liquid injection assembly and a battery cell liquid injection forming device. The battery cell liquid injection assembly comprises a liquid injection pipe and a supporting wire, the first end of the liquid injection pipe can be inserted into an aluminum plastic film of the battery cell, and the second end of the liquid injection pipe is selectively connected with the liquid injection device or the formation device; the supporting wire is detachably inserted into the liquid injection pipe, one end of the supporting wire is flush with the first end, the other end of the supporting wire extends out of the second end, and the melting point of the supporting wire is higher than that of the liquid injection pipe. By adopting the arrangement of the liquid injection pipe, the liquid injection pipe is inserted into an aluminum plastic film during heat sealing of a battery cell, and meanwhile, in order to avoid the situation that a channel in the liquid injection pipe is blocked due to the fact that the liquid injection pipe is melted during heat sealing, the supporting wire is inserted into the liquid injection pipe during heat sealing, the melting point of the supporting wire is higher, the supporting wire is not prone to being melted, and the supporting wire is pulled out after heat sealing is finished; the arrangement of an air bag in the prior art is replaced, and the cost is greatly saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of electric core liquid injection subassembly and electric core liquid injection formation device. BACKGROUND

[0002] In the processing of electric core, need to carry out injection, formation etc., injection process injects electrolyte into electric core, formation process makes battery activation, and discharge gas generated in activation process.

[0003] In prior art, the packaging of electric core is divided into primary packaging and secondary packaging, a gas bag structure is reserved after primary packaging for bare electric core;In aluminum plastic film, bare electric core and gas bag structure are communicated, and injection and exhaust are both realized through gas bag structure;For example, when one-packaging, injection port is reserved in the side of gas bag structure, and the injection port is heat-sealed after injection is completed;Waste gas generated during formation is pre-stored in the gas bag structure, and vacuumizing after using guillotine knife to pierce the gas bag structure can discharge waste gas. After completing formation process, secondary packaging is carried out, and finally the gas bag structure is cut, the area of gas bag structure is roughly the same with the area of electric core region, and the cut gas bag structure is waste, and the production process in prior art has the problems of material waste and high material cost;In addition, because injection port is reserved in the side of gas bag structure, it has higher requirement for environmental humidity, and external moisture is easy to enter electric core and affect electric core performance.

[0004] Therefore, it is urgent to design a kind of electric core liquid injection subassembly and electric core liquid injection formation device to solve the above problems. UTILITY MODEL CONTENT

[0005] One purpose of the utility model is to provide a kind of electric core liquid injection subassembly, adopt injection tube to replace aluminum plastic film gas bag, can omit the setting of aluminum plastic film gas bag in the side of electric core, save production cost, improve injection formation efficiency, and support silk can prevent injection tube from being fused and causing the problem of blocking injection tube passage when packaging.

[0006] Another purpose of the utility model is to provide a kind of electric core liquid injection formation device, can save cost and simplify setting.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] Electric core liquid injection subassembly, comprising:

[0009] Injection tube, the first end of the above injection tube can be inserted into the aluminum plastic film of electric core, and the second end of the above injection tube can be selectively connected with injection device or formation device;

[0010] A support wire is detachably inserted into the liquid injection tube, one end of the support wire is flush with the first end, the other end of the support wire extends out of the second end, and the melting point of the support wire is higher than the melting point of the liquid injection tube.

[0011] As an optional solution, the liquid injection tube comprises a bending portion, the bending portion is arranged along the circumference of the liquid injection tube, and is arranged between the portion of the liquid injection tube extending out of the aluminum plastic film and the second end of the liquid injection tube.

[0012] As an optional solution, the bending portion is a bendable hose.

[0013] As an optional solution, the thickness of the tube wall at the bending portion is smaller than the thickness of the tube wall of the liquid injection tube.

[0014] As an optional solution, the battery liquid injection assembly further comprises a plugging member, and the second end of the liquid injection tube is selectively plugged by the plugging member.

[0015] As an optional solution, the plugging member comprises:

[0016] A plug is in plug-fit cooperation with the second end of the liquid injection tube.

[0017] A holding portion is connected to the plug, and the diameter of the holding portion is larger than the diameter of the plug.

[0018] As an optional solution, the plug is provided in a cylindrical structure, the outer diameter of the plug is matched with the inner diameter of the liquid injection tube, and the plug is inserted into the liquid injection tube.

[0019] As an optional solution, the plug is provided in a hollow cylindrical structure, the inner diameter of the plug is matched with the outer diameter of the liquid injection tube, and the liquid injection tube is inserted into the plug.

[0020] A battery liquid injection and formation device comprises:

[0021] The battery liquid injection assembly described above;

[0022] The liquid injection device and the formation device, the formation device comprises a liquid storage device and a vacuum device in communication, and the second end of the liquid injection tube is selectively connected to the liquid injection device or the liquid storage device.

[0023] As an optional solution, a weighing device is further included, and the weighing device is configured to weigh the battery multiple times.

[0024] The beneficial effects of the utility model lie in:

[0025] The utility model provides a kind of electric core liquid injection assembly, by adopting the setting of injection pipe, when electric core heat sealing, injection pipe is inserted into aluminium plastic film, simultaneously in order to avoid heat sealing, injection pipe is fused and lead to the passage in injection pipe is blocked, when heat sealing, support silk is inserted into injection pipe, the melting point of support silk is higher, not easy to be melted, after heat sealing, support silk is extracted, guarantee the passage in injection pipe, whereby, the injection pipe can be selected and injection device is connected, for injecting electrolyte into electric core, after injection, it can also be used The injection pipe is connected with formation device to form, instead of the setting of air bag in prior art, greatly save cost.

[0026] The utility model further provides a kind of electric core liquid injection formation device, including above-mentioned electric core liquid injection assembly, injection device and formation device, formation device includes intercommunicating vacuum device and liquid storage device, the second end of injection pipe is selectively connected with injection device or liquid storage device.The electric core liquid injection formation device described above, by adopting above-mentioned electric core liquid injection assembly, the setting of electric core can be simplified, save cost.In addition, the setting of liquid storage device can store electrolyte that is vacuumed, after vacuum failure, electrolyte flows back into electric core, reduce the loss of electrolyte. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure schematic diagram of electric core liquid injection formation device provided by the utility model embodiment;

[0028] Figure 2 It is the structure schematic diagram of electric core and electric core liquid injection assembly provided by the utility model embodiment.

[0029] In the drawing:

[0030] 10, injection pipe;20, plugging piece;21, plug;22, gripping portion;30, bending portion;

[0031] 200, electric core;300, formation device;310, vacuum device;320, liquid storage device;400, recovery device;500, inert gas generating device;600, weighing device. DETAILED DESCRIPTION

[0032] The utility model makes further detailed explanation in combination with drawing and embodiment. It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model. In addition, it needs to be explained that, in order to facilitate description, only part relevant to the utility model is shown in the drawing, not all structures.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] This embodiment provides a battery cell liquid injection assembly, which uses an injection tube 10 instead of an aluminum-plastic film air bag, eliminating the need for the aluminum-plastic film air bag on the battery cell 200 side, saving costs. The support wire prevents the injection tube 10 from melting during encapsulation. Figure 1 As shown, the battery cell liquid injection assembly includes a liquid injection tube 10 and a support wire. The first end of the liquid injection tube 10 can be inserted into the aluminum-plastic film of the battery cell 200, and the second end of the liquid injection tube 10 can be selectively connected to a liquid injection device or a formation device 300. The support wire is detachably inserted into the liquid injection tube 10. One end of the support wire is flush with the first end, and the other end of the support wire extends out of the second end. The melting point of the support wire is higher than the melting point of the liquid injection tube 10.

[0037] The above liquid injection assembly of the battery cell, by adopting the setting of the liquid injection pipe 10, when the battery cell 200 is heat sealed, the liquid injection pipe 10 is inserted into the aluminum plastic film, and at the same time, in order to avoid the liquid injection pipe 10 being melted during heat sealing, causing the channel in the liquid injection pipe 10 to be blocked, the supporting wire is inserted into the liquid injection pipe 10 during heat sealing, and the melting point of the supporting wire is higher and is not easy to be melted. After heat sealing is completed, the supporting wire is pulled out to ensure the smoothness of the channel in the liquid injection pipe 10. Therefore, the liquid injection pipe 10 can be connected with the liquid injection device to inject electrolyte into the battery cell 200, and after the liquid injection is completed, the liquid injection pipe 10 can also be connected with the formation device 300 to perform formation, instead of the setting of the air bag in the prior art, thereby greatly saving the cost.

[0038] It should be noted that, Figure 1 In the figure, the connection of the battery cell 200 and the formation device 300 is shown, and the liquid injection device is not shown.

[0039] In addition, only the supporting wire is used during the heat sealing process, and then it is taken out, so Figure 1 The supporting wire is not shown in the figure.

[0040] In the embodiment, the liquid injection pipe 10 can adopt a PP pipe, and the material can be selected as polypropylene. The polypropylene is light in quality, and subsequent placement at the battery cell 200 will not increase the total mass of the battery much. At the same time, the polypropylene has good chemical corrosion resistance and can adapt to the complex use environment of the battery cell 200. In addition, the melting point of the polypropylene is 164-176℃, and the use temperature range is -30-140℃, which is suitable for various high-temperature application scenarios. For the thermoplastic process, it can better resist high temperature and adapt to the high-temperature use scenario of the battery cell 200. Finally, the polypropylene has high strength, wear resistance and good electrical insulation, which reduces the possibility of damage caused by collision during use of the battery cell 200. The above is only an example and is not limited.

[0041] In the embodiment, the material of the supporting wire can be metal. The melting point of metal is higher than that of plastic, which can ensure that the channel in the liquid injection pipe 10 is not blocked. The supporting wire can be selected from any one of iron, nickel or copper. The above materials are relatively easy to obtain and low in cost. The above is only an example and is not limited.

[0042] In the embodiment, the battery cell 200 can adopt a liquid battery cell, a semi-solid battery cell or a quasi-solid battery cell. The battery cell 200 can be a same-side electrode cell, i.e., the tabs are arranged on the same side of the battery cell, or an opposite-side electrode cell, i.e., the tabs are arranged on the opposite side of the battery cell. The liquid injection pipe 10 can be arranged on the top, side or bottom of the battery cell 200, and the position of the arrangement can be matched according to actual production needs without limitation.

[0043] Optionally, the liquid injection pipe 10 comprises a bending portion 30, which is arranged along the circumference of the liquid injection pipe 10 and between the portion of the liquid injection pipe 10 extending out of the aluminum-plastic film and the second end of the liquid injection pipe 10.

[0044] When the operator disconnects the liquid injection pipe 10 from the liquid injection device or disconnects the liquid injection pipe 10 from the formation device 300, the liquid injection pipe 10 can be bent through the bending portion 30 to temporarily seal the channel of the liquid injection pipe 10, so as to avoid air entering the battery cell 200 from the liquid injection pipe 10 when disconnected.

[0045] In an embodiment, the bending portion 30 is a bendable hose. In this embodiment, the bending portion 30 can be a PVC hose, which ensures the smooth bending operation of the operator and avoids damage to the liquid injection pipe 10 caused by multiple bending operations.

[0046] In another embodiment, the thickness of the pipe wall of the bending portion 30 is smaller than that of the liquid injection pipe 10. In this embodiment, the thickness of the pipe wall of the bending portion 30 is slightly smaller, which facilitates the bending operation of the operator. Moreover, only the thickness of the pipe wall is changed, which does not affect the liquid injection of the liquid injection pipe 10. In this embodiment, the bending portion 30 can be made of the same material as the liquid injection pipe 10 and is integrally formed, which improves the production efficiency.

[0047] Optionally, as shown in Figure 2 , the battery cell liquid injection assembly further comprises a plugging member 20, and the second end of the liquid injection pipe 10 is selectively plugged by the plugging member 20. Through the above arrangement, the second end of the liquid injection pipe 10 can be plugged in time after the liquid injection is completed or after the formation is completed, so as to prevent gas from entering the inside of the battery cell 200.

[0048] Optionally, as shown in Figure 2 , the plugging member 20 comprises a plug 21 and a holding portion 22. The plug 21 is capable of being inserted into the second end of the liquid injection pipe 10. The holding portion 22 is connected to the plug 21, and the diameter of the holding portion 22 is greater than that of the plug 21. Through the above arrangement, the operator can hold the holding portion 22 to operate the plugging member 20. In this embodiment, the plug 21 and the holding portion 22 are both cylindrical. In other embodiments, the holding portion 22 can also be square. The above is only an example and is not limited.

[0049] In an embodiment, the plug 21 is provided in a cylindrical structure, the outer diameter of the plug 21 is matched with the inner diameter of the liquid injection pipe 10, and the plug 21 is inserted into the liquid injection pipe 10. The above cylindrical structure can be a hollow structure or a solid structure. In this embodiment, the plug 21 is a solid cylinder to ensure the reliability of the sealing.

[0050] In another embodiment, the plug 21 is provided as a hollow cylindrical structure, the inner diameter of the plug 21 is matched with the outer diameter of the liquid injection tube 10, and the liquid injection tube 10 is inserted into the plug 21. In this embodiment, the inner diameter of the plug 21 can be slightly smaller than the outer diameter of the liquid injection tube 10 to ensure an interference fit, thereby ensuring good sealing.

[0051] Optionally, the length of the liquid injection tube 10 is A, and 9mm≤A≤12mm; in this embodiment, A=10mm, and in other embodiments, A=9mm, 9.5mm, 10.5mm, 11mm, 11.5mm, or 12mm, which are only examples and are not limited, and this length can be adapted to most soft package batteries.

[0052] Optionally, the inner diameter of the liquid injection tube 10 is D, and 0.8mm≤D≤1.2mm, in this embodiment, D=1mm, and in other embodiments, D=0.8mm, 0.9mm, 1.1mm, or 1.2mm, which are only examples and are not limited, and this size is relatively smooth for the flow of liquid and gas, and the size will not be too large to affect the overall thickness of the battery cell 200.

[0053] Optionally, the wall thickness of the liquid injection tube 10 is W, and 0.8mm≤W≤1.2mm. In this embodiment, D=1mm, and in other embodiments, W=0.8mm, 0.9mm, 1.1mm, or 1.2mm, which are only examples and are not limited, and this size of the liquid injection tube 10 is sufficient in strength, and the size will not be too large to affect the overall thickness of the battery cell 200.

[0054] This embodiment also provides a battery cell liquid injection and formation device, as shown in Figure 1 The battery cell liquid injection and formation device includes the above-mentioned battery cell liquid injection assembly, a liquid injection device, and a formation device 300, the formation device 300 includes a vacuum device 310 and a liquid storage device 320 in communication, and the second end of the liquid injection tube 10 is selectively connected to the liquid injection device or the liquid storage device 320. The battery cell liquid injection and formation device can simplify the setting of the gas bag of the battery cell 200 by using the above-mentioned battery cell liquid injection assembly, thereby saving costs. In addition, as shown in Figure 1 The setting of the liquid storage device 320 can store the electrolyte sucked by the vacuum, and after the vacuum fails, the electrolyte flows back into the battery cell 200, thereby reducing the loss of electrolyte.

[0055] Optionally, as shown in Figure 1 The battery cell liquid injection and formation device also includes a weighing device 600 configured to weigh the battery cell 200 multiple times. In this way, the mass difference of the battery cell 200 before and after formation can be obtained, thereby providing accurate data for subsequent secondary liquid supplement.

[0056] Optionally, as shown in Figure 1As shown, the liquid injection and formation device for the battery cell further comprises a recovery device 400 and an inert gas generating device 500, wherein the recovery device 400 can absorb the exhaust gas in the formation device 300 and recover, when the vacuum device 310 is not working, the inert gas generating device 500 fills the inert gas into the liquid storage device 320, so that the electrolyte in the liquid storage device 320 is completely backflowed into the battery cell 200 under the action of gas pressure, further reducing the loss of electrolyte in the battery cell 200, wherein the inert gas can be nitrogen or argon.

[0057] The use process of the liquid injection and formation device for the battery cell is described below.

[0058] 1. During the heat sealing stage of the battery cell 200, an injection pipe 10 is placed at the aluminum plastic film sealing port of the battery cell 200, one end of the injection pipe 10 is close to the battery cell 200, and the other end is exposed outside, a supporting wire is inserted into the injection pipe 10, one end of the supporting wire is flush with one end of the injection pipe 10, and the other end extends out of the injection pipe 10;

[0059] 2. The battery cell 200 is heat sealed, the heat sealing temperature is 180±5℃, the heat sealing time is 5±1s, and after the heat sealing is completed, the supporting wire is pulled out from one side of the injection pipe 10;

[0060] 3. The injection pipe 10 is bent by the bending part 30 to cut off the channel of the injection pipe 10, after the injection pipe 10 is connected with the liquid injection device, the bending part 30 is loosened to make the channel of the injection pipe 10 flow for liquid injection, after the liquid injection is completed, the injection pipe 10 is bent again, the injection pipe 10 is sealed by the sealing element 20, and then the injection pipe 10 is loosened, and is placed for 48 hours, which can be adjusted according to the needs of different battery cells 200;

[0061] 4. The injection pipe 10 is bent, the plug 21 is pulled out, and the injection pipe 10 is connected to the liquid storage device 320, the vacuum device 310 is started, the battery cell 200 is vacuumized, and the exhaust gas enters the recovery device 400;

[0062] 5. The recovery device 400 and the vacuum device 310 are closed, the inert gas generating device 500 is started, the inert gas enters the airflow pipe, the electrolyte in the liquid storage device 320 is extruded and backflowed into the battery cell 200, and the pressure of the airflow pipe can be controlled by the valve on the pipe;

[0063] 6. The inert gas generating device 500 is closed, the recovery device 400 and the vacuum device 310 are started, the vacuum degree is set to-0.03kPa, which can be adjusted according to the needs of different battery cells 200, the battery cell 200 is pre-charged and formed, and the gas generated by the battery cell 200 gradually enters the recovery device;

[0064] 7. After the pre-charging formation of the battery cell 200 is completed, the total mass of the battery cell 200 is measured, and the difference with the set liquid reserve is calculated to carry out secondary liquid supplementing;

[0065] 8. The injection pipe 10 of the above-mentioned battery cell 200 after formation is bent, and the pipe opening of the injection pipe 10 is quickly sealed by the plug 21.

[0066] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. An electrolyte injection assembly for an electrochemical cell, the assembly comprising: The application relates to an electrolyte injection assembly for an electric core, comprising: an electrolyte injection pipe (10), a first end of the electrolyte injection pipe (10) being capable of being inserted into an aluminum plastic film of an electric core (200), and a second end of the electrolyte injection pipe (10) being selectively connected with an electrolyte injection device or a formation device (300); a supporting wire, which is detachably inserted into the electrolyte injection pipe (10), one end of the supporting wire being flush with the first end, and the other end of the supporting wire extending out of the second end, the supporting wire having a melting point higher than that of the electrolyte injection pipe (10).

2. The cell liquid injection assembly of claim 1, wherein, The electrolyte injection pipe (10) comprises a bending part (30), which is arranged along the circumference of the electrolyte injection pipe (10) and is arranged between the part of the electrolyte injection pipe (10) extending out of the aluminum plastic film and the second end of the electrolyte injection pipe (10).

3. The cell liquid injection assembly of claim 2, wherein, The bending part (30) is a bendable hose.

4. The cell liquid injection assembly of claim 2, wherein, The thickness of the pipe wall at the bending part (30) is smaller than that of the electrolyte injection pipe (10).

5. The cell liquid injection assembly of any one of claims 1-4, wherein, The electrolyte injection assembly for the electric core further comprises a plugging member (20), and the second end of the electrolyte injection pipe (10) is selectively plugged by the plugging member (20).

6. The cell liquid injection assembly of claim 5, wherein, The plugging member (20) comprises: a plug (21) which is in plug-in cooperation with the second end of the electrolyte injection pipe (10); a gripping part (22) which is connected with the plug (21) and has a diameter larger than that of the plug (21).

7. The cell liquid injection assembly of claim 6, wherein, The plug (21) is arranged in a cylindrical structure, the outer diameter of the plug (21) being matched with the inner diameter of the electrolyte injection pipe (10), and the plug (21) is inserted into the electrolyte injection pipe (10).

8. The cell liquid injection assembly of claim 6, wherein, The plug (21) is arranged in a hollow cylindrical structure, the inner diameter of the plug (21) being matched with the outer diameter of the electrolyte injection pipe (10), and the electrolyte injection pipe (10) is inserted into the plug (21).

9. An apparatus for liquid infusion and formation of an electric cell, characterized by The application further relates to an electrolyte injection assembly for an electric core, comprising: the electrolyte injection assembly for the electric core according to any one of claims 1-8; an electrolyte injection device; a formation device (300) comprising a liquid storage device (320) and a vacuum device (310) which are connected in communication, and the second end of the electrolyte injection pipe (10) is selectively connected with the electrolyte injection device or the liquid storage device (320).

10. The apparatus of claim 9, wherein the at least one of the plurality of electrodes is configured to be electrically coupled to a power source. Further comprising a weighing device (600) which is configured to weigh the electric core (200) for multiple times.

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