Liquid injection device and production line

Abstract

A liquid injection device and a production line. The liquid injection device comprises a vacuumizing air circuit (1), a first-stage cup (2), a second-stage cup (3), a plurality of liquid injection circuits (4) and a plurality of liquid-passing assemblies (5); a plurality of mutually isolated buffer cavities are formed in the first-stage cup (2); a plurality of mutually isolated liquid injection cavities are formed in the second-stage cup (3), and each liquid injection cavity is communicated with the vacuumizing air circuit (1); each liquid injection circuit (4) is communicated with one buffer cavity; the liquid-passing assemblies (5), the buffer cavities, and the liquid injection cavities are arranged in a one-to-one correspondence mode, each liquid-passing assembly (5) comprises a liquid-passing channel (51) and a first switch member (52), the liquid-passing channel (51) is communicated with one buffer cavity and one liquid injection cavity, and the first switch member (52) is arranged in the liquid passing channel (51) so as to selectively open or close the liquid-passing channel (51). By means of the vacuumizing air circuit (1), the first-stage cup (2), the second-stage cup (3), the plurality of liquid injection circuits (4) and the plurality of liquid-passing assemblies (5), liquid preparation and vacuumizing can be carried out simultaneously, the liquid injection duration can be shortened, and one liquid injection device can inject liquid into a plurality of battery cells, further improving production efficiency.

Description

Liquid injection device and production line

[0001] Cross-reference to related applications

[0002] The present disclosure is based on the Chinese patent application No. 202420096151.0, filed on January 15, 2024, entitled "Liquid injection device and production line", and claims priority to the Chinese patent application No. 202420096151.0, the entire contents of which are hereby incorporated by reference into the present disclosure. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a liquid injection device and a production line. BACKGROUND

[0004] Batteries are increasingly widely used in life and production. For example, new energy vehicles equipped with batteries have been widely used, and batteries can be used to provide all or part of power for new energy vehicles. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] A battery includes at least one battery cell. In the production process of the battery, electrolyte needs to be injected into the internal cavity of the battery cell through a liquid injection device. In the related art, the liquid injection device includes a liquid injection cup. The liquid injection cup is in communication with the internal cavity of the battery cell. Generally, the liquid injection cup and the internal cavity of the battery cell need to be vacuumed first, and then the electrolyte is injected into the liquid injection cup and injected into the internal cavity of the battery cell through the liquid injection cup. Since the liquid injection operation can be performed only after the vacuuming operation is completed, the liquid injection time is long, and the production efficiency is low.

[0006] Utility model content

[0007] Therefore, the embodiments of the present disclosure aim to provide a liquid injection device and a production line, which can shorten the liquid injection time and improve the production efficiency.

[0008] To achieve the above object, the technical scheme of the embodiments of the present disclosure is as follows:

[0009] The present disclosure provides a liquid injection device, which comprises:

[0010] a vacuum air path;

[0011] a primary cup formed with a plurality of buffer cavities isolated from each other;

[0012] a secondary cup formed with a plurality of liquid injection cavities isolated from each other, each of the liquid injection cavities being in communication with the vacuum air path;

[0013] a plurality of injection liquid paths, each of the injection liquid paths being in communication with one of the buffer cavities;

[0014] A plurality of liquid passing assemblies are provided in one-to-one correspondence with the buffer cavities and the liquid injection cavities, each of the liquid passing assemblies comprising a liquid passing channel and a first switch element, the liquid passing channel being connected to one of the buffer cavities and one of the liquid injection cavities, and the first switch element being arranged in the liquid passing channel to selectively open or close the liquid passing channel.

[0015] The liquid injection device provided by the embodiments of the present disclosure can realize simultaneous liquid preparation and vacuum extraction, thereby solving the problem of long liquid injection time caused by vacuum extraction before liquid injection in the prior art and improving production efficiency.

[0016] In some embodiments, the liquid injection device comprises a primary gas path, and each of the buffer cavities is connected to the primary gas path.

[0017] In this embodiment, after the liquid preparation and vacuum extraction are completed, the primary gas path can be used to maintain a slight positive pressure or normal pressure in each of the buffer cavities, so that the electrolyte in the buffer cavities can smoothly enter the liquid injection cavities.

[0018] In some embodiments, the primary gas path comprises:

[0019] A primary busbar is formed with a primary bus channel and a main gas port connected to the primary bus channel, and each of the buffer cavities is connected to the primary bus channel.

[0020] A main gas pipe is connected to the main gas port.

[0021] In this embodiment, one primary bus channel can be connected to all the buffer cavities, and the pressurization or depressurization of all the buffer cavities can be realized by using one main gas pipe and one bus channel, which can not only save the pipeline and reduce the cost, but also reduce the difficulty of pipeline layout.

[0022] In some embodiments, the primary busbar is arranged at the top of the primary cup.

[0023] In this embodiment, the height of the primary busbar is higher than the height of the buffer cavities, so that the electrolyte in the buffer cavities can be prevented from entering the primary bus channel as much as possible.

[0024] In some embodiments, the liquid injection device comprises a plurality of second switch elements, and the vacuum extraction gas path comprises:

[0025] The second busbar is formed with a second bus channel and a total gas port in communication with the second bus channel. Each of the liquid injection cavities is in communication with the second bus channel. Each of the liquid injection cavities is provided with a second switch element for selectively opening or closing the air flow path between the corresponding liquid injection cavity and the second bus channel.

[0026] The total gas pipe is in communication with the total gas port.

[0027] In this embodiment, on the one hand, each of the liquid injection cavities is provided with a second switch element, and the opening and closing of the air flow path between each of the liquid injection cavities and the second bus channel is realized through the second switch element, so as to more accurately control the vacuum degree of each of the liquid injection cavities, thereby improving the reliability. On the other hand, one second bus channel is in communication with one total gas pipe, which not only can save the pipeline and reduce the cost, but also can reduce the difficulty of pipeline layout.

[0028] In some embodiments, the second busbar is arranged at the top of the second cup.

[0029] In this embodiment, the height of the second busbar is higher than the height of the liquid injection cavity, so as to avoid the liquid in the liquid injection cavity from entering the second bus channel as much as possible.

[0030] In some embodiments, the height of the first cup is higher than the height of the second cup.

[0031] In this embodiment, after the liquid preparation and the vacuum extraction are completed, the electrolyte in the buffer cavity can enter the liquid injection cavity under the action of gravity, so as to reduce the resistance in the flow process of the electrolyte and improve the liquid injection efficiency.

[0032] In some embodiments, the liquid injection device comprises a third switch element corresponding to each of the injection liquid paths. The third switch element is arranged in the injection liquid path to selectively open or close the injection liquid path.

[0033] In this embodiment, the third switch element can be used to more accurately control the liquid volume of the electrolyte entering the buffer cavity, and the third switch element can also be used to close the injection liquid path without injecting electrolyte into the buffer cavity.

[0034] In some embodiments, the liquid injection device comprises a plurality of fourth switch elements and a plurality of liquid injection nozzles arranged in the second cup. Each of the liquid injection cavities is in communication with one of the liquid injection nozzles. Each of the liquid injection cavities and the corresponding liquid injection nozzle is provided with one of the fourth switch elements. The fourth switch element is used to selectively open or close the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle.

[0035] In the embodiment, before the liquid injection cavity is vacuumized, the fourth switch member can cut off the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle, so as to quickly vacuumize the liquid injection cavity. In the process that the electrolyte in the liquid injection cavity enters the internal cavity of the battery cell, the fourth switch member turns on the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle; after the liquid injection is completed, the fourth switch member can cut off the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle again, so as to avoid that external air enters the liquid injection cavity through the liquid injection nozzle.

[0036] The embodiments of the present disclosure also provide a production line for producing a battery, comprising the liquid injection device described in any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0037] Fig. 1 is a structural schematic diagram of a liquid injection device in an embodiment of the present disclosure;

[0038] Fig. 2 is a structural schematic diagram of another view of the structure shown in Fig. 1;

[0039] Fig. 3 is an enlarged schematic diagram of A in Fig. 1.

[0040] EXPLANATION OF REFERENCE NUMERALS

[0041] Vacuumizing air path 1; secondary bus bar 11; main air pipe 12; primary cup 2; secondary cup 3; liquid injection path 4; liquid passing assembly 5; liquid passing channel 51; first switch member 52; primary air path 6; primary bus bar 61; main air pipe 62; second switch member 7; third switch member 8; fourth switch member 9; liquid injection nozzle 10. DETAILED DESCRIPTION

[0042] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure.

[0044] In the description of the embodiments of the present disclosure, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0045] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in a combination of embodiments.

[0046] The liquid injection device and the production line provided by the embodiments of the disclosure are both used for battery production. In order to clearly describe the liquid injection device and the production line of the embodiments of the disclosure, the battery of the embodiments of the disclosure is introduced first.

[0047] The battery provided by the embodiments of the disclosure can be used alone. The battery can also be used as a battery pack in groups. The battery and the battery pack can be used in an electrical device, but are not limited to. The electrical device includes, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a vehicle, a ship, or a spacecraft, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0048] Taking the electrical device of an embodiment of the disclosure as a vehicle for example, the vehicle can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle is internally provided with a battery. The battery can be arranged at the bottom of the vehicle or at the front or tail of the vehicle. The battery can be used for power supply of the vehicle, for example, the battery can be used as an operating power source of the vehicle. In some embodiments, the battery can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0049] The battery can be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, or a lithium sulfur battery, etc. The embodiments of the disclosure are not limited thereto.

[0050] The battery includes at least one battery cell. The battery cell is an energy storage component of the battery. The battery further includes a battery monitoring and management device for monitoring the electric quantity of the battery cell.

[0051] In the battery, the battery cell can be multiple. The multiple battery cells can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells are connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in a mixed connection. Of course, the battery can also be in the form of a battery module composed of multiple battery cells connected in series, in parallel, or in a mixed connection. Multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole.

[0052] In the embodiments of the disclosure, the battery cell can be a secondary battery cell. The secondary battery cell means that the battery cell can be activated by charging after discharging to continue to be used.

[0053] The battery cell can be a cylindrical battery cell, a prismatic battery cell, or other shaped battery cell. The prismatic battery cell includes a square battery cell or a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, without specific limitation in the present disclosure.

[0054] The internal cavity of the battery cell is used to place the electrode assembly and the electrolyte. For example, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing forms an internal cavity, and the electrode assembly and the electrolyte are placed in the internal cavity of the housing. The housing is used to encapsulate the electrode assembly, the electrolyte, and other components.

[0055] Referring to FIG. 1, the present disclosure provides a liquid injection device. The liquid injection device includes a vacuum air path 1, a primary cup 2, a secondary cup 3, a plurality of injection liquid paths 4, and a plurality of liquid passing assemblies 5.

[0056] The primary cup 2 forms a plurality of buffer cavities that are isolated from each other. Each injection liquid path 4 is connected to one buffer cavity. The injection liquid path 4 is used to inject liquid, such as electrolyte, into the corresponding connected buffer cavity. The electrolyte in each buffer cavity cannot flow into each other.

[0057] The secondary cup 3 forms a plurality of injection cavities that are isolated from each other, and each injection cavity is connected to the vacuum air path 1. The vacuum air path 1 is used to vacuumize each injection cavity. The electrolyte in each injection cavity cannot flow into each other.

[0058] Referring to FIG. 1, the liquid passing assembly 5, the buffer cavity, and the injection cavity are arranged one-to-one. The liquid passing assembly 5 includes a liquid passing channel 51 and a first switch 52. The liquid passing channel 51 connects one buffer cavity and one injection cavity. The first switch 52 is arranged in the liquid passing channel 51 to selectively turn on or turn off the liquid passing channel 51. That is, one buffer cavity and one injection cavity form a pair, and each liquid passing assembly 5 corresponds to a pair of buffer cavity and injection cavity, and the liquid passing channel 51 connects the pair of buffer cavity and injection cavity.

[0059] For example, when the battery cell needs to be injected with liquid, the injection cavity is connected to the internal cavity of the battery cell, and the first switch 52 is in a state of turning off the liquid passing channel 51, so that the gas and the liquid cannot flow between the injection cavity and the buffer cavity. The internal cavity of the battery cell and each injection cavity can be vacuumized through the vacuum air path 1, and at the same time, the electrolyte can be injected into the buffer cavity through the injection liquid path 4, so that the liquid preparation and the vacuumization are simultaneously performed. After the liquid preparation and the vacuumization are completed, the liquid injection step is entered, which includes: the first switch 52 is switched to a state of turning on the liquid passing channel 51, and the prepared electrolyte in the buffer cavity can enter the injection cavity through the liquid passing channel 51, and then enter the internal cavity of the battery cell through the injection cavity, so that the liquid injection is completed.

[0060] It can be understood that each liquid injection cavity is communicated with the internal cavity of one battery cell, and therefore, multiple liquid injection cavities can inject liquid into multiple battery cells, and the liquid injection into multiple battery cells can be performed simultaneously or separately according to requirements.

[0061] The liquid injection device provided by the embodiments of the present disclosure can realize simultaneous liquid preparation and vacuumizing through the vacuumizing air path 1, the primary cup 2, the secondary cup 3, the multiple liquid injection paths 4 and the multiple liquid passing assemblies 5, thereby solving the problem of long liquid injection time caused by the prior art of liquid injection after vacuumizing, shortening the liquid injection time and improving the production efficiency. On the other hand, the primary cup 2 is formed with multiple mutually isolated buffer cavities, the secondary cup 3 is formed with multiple mutually isolated liquid injection cavities, and the multiple liquid passing assemblies 5 are respectively connected to each buffer cavity and liquid injection cavity in an on-off manner, so that one liquid injection device can inject liquid into multiple battery cells, further improving the production efficiency.

[0062] The type of the liquid passing channel 51 is not limited, and for example, the liquid passing channel 51 can be composed of a pipe.

[0063] The first switch member 52 can be an electrically controlled valve, and for example, the first switch member 52 includes but is not limited to a membrane plug valve. In this way, the opening and closing of the first switch member 52 can be controlled by a control circuit, thereby controlling the on-off of the liquid passing channel 51, and the degree of automation is high.

[0064] In some embodiments, referring to FIG. 1, the liquid injection device includes a primary air path 6, and each buffer cavity is communicated with the primary air path 6. The primary air path 6 is used to adjust the air pressure in each buffer cavity. For example, the primary air path 6 can be used to pressurize or depressurize the buffer cavity.

[0065] In this embodiment, after the liquid preparation and vacuumizing are completed, the primary air path 6 can be used to keep each buffer cavity at a slight positive pressure or normal pressure, so that the electrolyte in the buffer cavity can smoothly enter the liquid injection cavity.

[0066] In one embodiment, referring to FIGS. 1 to 3, the primary air path 6 includes a primary busbar 61 and a main air pipe 62, and the primary busbar 61 is formed with a primary busbar channel and a main air port communicated with the primary busbar channel. Each buffer cavity is communicated with the primary busbar channel. The main air pipe 62 is communicated with the main air port.

[0067] In this embodiment, one primary busbar channel can be communicated with all buffer cavities, and the pressurization or depressurization of all buffer cavities can be realized through one main air pipe 62 and one busbar channel, which not only can save the pipeline and reduce the cost, but also can reduce the difficulty of pipeline layout.

[0068] In an example, the liquid injection device includes a gas pump and a fifth switch element. The gas pump is connected to the main gas pipe 62, and the fifth switch element is arranged on the main gas pipe 62 to selectively open or close the gas path in the main gas pipe 62. One gas pump can supply gas to multiple buffer cavities through the main gas pipe 62 and the primary busbar 61.

[0069] In an example, referring to FIGS. 1-3, the primary busbar 61 is arranged on the top of the primary cup 2. Specifically, the top of the primary cup 2 is formed with multiple air vents, each of which is in communication with a buffer cavity, and the primary busbar is in communication with the air vents. The height of the primary busbar 61 is higher than the height of the buffer cavity, which can avoid the electrolyte in the buffer cavity from entering the primary busbar as much as possible.

[0070] In an example, referring to FIG. 1, the liquid injection device includes multiple second switch elements 7, and the vacuumizing gas path 1 includes a secondary busbar 11 and a total gas pipe 12.

[0071] The secondary busbar 11 is formed with a secondary busbar channel and a total gas port in communication with the secondary busbar channel. Each liquid injection cavity is in communication with the secondary busbar channel, and each liquid injection cavity is provided with a second switch element 7 corresponding thereto. The second switch element 7 is used to selectively open or close the gas flow path between the corresponding liquid injection cavity and the secondary busbar channel. The total gas pipe 12 is in communication with the total gas port.

[0072] In this example, on the one hand, each liquid injection cavity is provided with a second switch element 7 corresponding thereto, and the opening and closing of the gas flow path between each liquid injection cavity and the secondary busbar channel is realized through the second switch element 7, so as to more accurately control the vacuum degree of each liquid injection cavity, thereby improving the reliability. On the other hand, one secondary busbar channel is in communication with one total gas pipe 12, which not only can save the pipeline and reduce the cost, but also can reduce the difficulty of pipeline layout.

[0073] The second switch element 7 can be an electrically controlled valve, and exemplarily, the second switch element 7 includes but is not limited to a piston valve. In this way, the opening and closing of the second switch element 7 can be controlled by a control circuit, and the automation degree is high.

[0074] In an example, the liquid injection device includes a vacuum gas source, and the vacuum gas source is connected to the total gas pipe 12. One vacuum gas source can vacuumize multiple liquid injection cavities through the total gas pipe 12 and the secondary busbar 11.

[0075] The vacuum gas source includes but is not limited to a vacuum pump.

[0076] In an embodiment, referring to FIG. 1 and FIG. 2, the second busbar 11 is arranged on the top of the second cup 3. Specifically, the top of the second cup 3 is formed with a gas passage communicating with the liquid injection cavity, and the second busbar communicates with the gas passage. In this way, the height of the second busbar 11 is higher than the height of the liquid injection cavity, so as to avoid the liquid in the liquid injection cavity from entering the second busbar as much as possible.

[0077] In an embodiment, referring to FIG. 1 and FIG. 2, the height of the first cup 2 is higher than the height of the second cup 3. For example, the first cup 2 can be arranged above the second cup 3. After the preparation of the electrolyte and the end of the vacuumization, the electrolyte in the buffer cavity can enter the liquid injection cavity under the action of gravity, so as to reduce the resistance during the flow of the electrolyte and improve the efficiency of the liquid injection.

[0078] It should be noted that down refers to the direction towards the ground, and up refers to the direction opposite to down. The top is consistent with the up direction, and the bottom is consistent with the down direction.

[0079] In an embodiment, referring to FIG. 1 to FIG. 3, the liquid injection device comprises a third switch 8 corresponding to each of the liquid injection paths 4, and the third switch 8 is arranged on the liquid injection path 4 to selectively open or close the liquid injection path 4. In this way, the third switch 8 can be used to more accurately control the amount of electrolyte entering the buffer cavity, and the third switch 8 can also be used to close the liquid injection path 4 when the electrolyte is not needed to be injected into the buffer cavity.

[0080] The third switch 8 can be an electrically controlled valve, for example, the third switch 8 includes but is not limited to a diaphragm valve. In this way, the third switch 8 can be automatically controlled by a control circuit, and the degree of automation is high.

[0081] In an embodiment, the liquid injection device comprises an electrolyte pump connected to the liquid injection path 4 to pump the electrolyte.

[0082] In an embodiment, referring to FIG. 1 and FIG. 2, the liquid injection device comprises a plurality of fourth switches 9 and a plurality of liquid injection nozzles 10 arranged on the second cup 3. Each liquid injection cavity communicates with one liquid injection nozzle 10, and a fourth switch 9 is arranged between the liquid injection cavity and the corresponding liquid injection nozzle 10. The fourth switch 9 is used to selectively open or close the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle 10.

[0083] The liquid injection nozzle 10 is used to seal the liquid injection port of the battery cell, and the electrolyte in the liquid injection cavity can enter the internal cavity of the battery cell through the liquid injection nozzle 10 and the liquid injection port.

[0084] In this embodiment, before the liquid injection cavity is vacuumized, the fourth switch 9 can cut off the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle 10, so as to quickly vacuumize the liquid injection cavity. In the process of the electrolyte in the liquid injection cavity entering the internal cavity of the battery cell, the fourth switch 9 turns on the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle 10; after the liquid injection is completed, the fourth switch 9 can again cut off the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle 10, so as to avoid external air entering the liquid injection cavity through the liquid injection nozzle 10.

[0085] The fourth switch 9 can be an electrically controlled valve, and exemplary, the fourth switch 9 includes but is not limited to a membrane plug valve. In this way, the fourth switch 9 can be controlled by a control circuit to turn on and off, and the degree of automation is high.

[0086] In one embodiment, referring to FIGS. 1 and 2, the liquid injection nozzle 10 is located at the bottom of the secondary cup 3. In this way, the electrolyte can flow under the action of gravity, and the flow resistance is reduced.

[0087] In one specific embodiment, referring to FIGS. 1 to 3, the liquid injection device includes a vacuumizing air path 1, a primary air path 6, a primary cup 2, a secondary cup 3, a plurality of liquid injection paths 4, a plurality of liquid passing assemblies 5, a plurality of second switches 7, a third switch 8, a plurality of fourth switches 9, a plurality of liquid injection nozzles 10, and a fifth switch.

[0088] When there is no need to inject electrolyte into the internal cavity of the battery cell, the first switch 52, the second switch 7, the third switch 8, the fourth switch 9, and the fifth switch can all be in a closed state, that is, the vacuumizing air path 1, the primary air path 6, the liquid injection path 4, the liquid passing channel 51, and the liquid injection nozzle 10 are all in a cut-off state, and gas and liquid cannot enter or exit the buffer cavity and the liquid injection cavity.

[0089] When it is necessary to inject electrolyte into the internal cavity of the battery cell, the liquid injection port of the battery cell is in sealed connection with the liquid injection nozzle 10; a liquid preparation and vacuumizing step is first implemented, specifically including: the second switch 7 is turned on to make the vacuumizing air path 1 conductive, and a vacuum air source is turned on to vacuumize the liquid injection cavity and the internal cavity of the battery cell; at the same time, the third switch 8 is turned on to make the liquid injection path 4 conductive, and an electrolyte pump is operated to inject electrolyte into the buffer cavity. In this way, the liquid preparation and vacuumizing are simultaneously implemented. After the liquid preparation and vacuumizing are completed, a liquid injection step is implemented, specifically including: the second switch 7 is turned off to make the vacuumizing air path 1 cut off, the primary air path 6 supplies air to the buffer cavity to make the buffer cavity switch to normal pressure, the first switch 52 is turned on to make the liquid passing channel 51 conductive, and the fourth switch 9 is turned on to make the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle 10 conductive, and the electrolyte in the buffer cavity sequentially flows through the liquid passing channel 51, the liquid injection cavity, and the liquid injection nozzle 10, and finally enters the internal cavity of the battery cell. In this way, the liquid injection of the battery cell is completed.

[0090] The embodiments of the present disclosure further provide a production line, which comprises the liquid injection device according to any one of the embodiments of the present disclosure.

[0091] The liquid injection cavity is used to communicate with the internal cavity of the battery cell to inject the electrolyte into the internal cavity of the battery cell. For example, the liquid injection cavity can communicate with the liquid injection port of the battery cell through the liquid injection nozzle 10, so as to inject the electrolyte into the internal cavity of the battery cell.

[0092] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit the same; although the foregoing embodiments of the present disclosure are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner.

Claims

1. A liquid injection device comprising: Vacuum air circuit; The first-level cup is formed with multiple mutually isolated buffer cavities; The secondary cup is formed with a plurality of mutually isolated liquid injection cavities, each of which is connected to the vacuum air path; A plurality of injection liquid paths, each of the injection liquid paths being connected to one of the buffer chambers; Multiple liquid-passing components, the liquid-passing components, the buffer chambers and the liquid injection chambers are arranged in a one-to-one correspondence, the liquid-passing components include a liquid passage and a first switch component, the liquid passage connects one of the buffer chambers and one of the liquid injection chambers, the first switch component is arranged in the liquid passage to selectively open or close the liquid passage.

2. The liquid injection device according to claim 1, wherein The liquid injection device includes a primary air circuit, and each of the buffer chambers is connected to the primary air circuit.

3. The liquid injection device according to claim 2, wherein: The primary gas circuit comprises: A primary busbar is formed with a primary bus channel and a main gas port connected to the primary bus channel, and each of the buffer cavities is connected to the primary bus channel; A main air pipe is communicated with the main air port.

4. The liquid injection device according to claim 3, wherein: The primary bus is arranged on the top of the primary cup.

5. The liquid injection device according to claim 3, wherein: The liquid injection device includes an air pump and a fifth switch component. The air pump is connected to the main air pipe. The fifth switch component is arranged in the main air pipe to selectively open or close the air path in the main air pipe.

6. The liquid injection device according to any one of claims 1 to 5, wherein: The liquid injection device includes a plurality of second switch members, and the vacuum air circuit includes: a secondary busbar, forming a secondary bus channel and a main gas port connected to the secondary bus channel, each of the injection chambers being connected to the secondary bus channel, and each of the injection chambers being provided with a corresponding second switch member, the second switch member being used to selectively open or close the airflow path between the corresponding injection chamber and the secondary bus channel; A main gas pipe is communicated with the main gas port.

7. The liquid injection device according to claim 6, wherein: The second switch element is an electrically controlled valve.

8. The liquid injection device according to claim 6, wherein: The liquid injection device includes a vacuum air source, which is connected to the main air pipe.

9. The liquid injection device according to claim 6, wherein: The secondary bus is arranged on the top of the secondary cup.

10. The liquid injection device according to any one of claims 1 to 9, wherein: The height of the first-level cup is higher than that of the second-level cup.

11. The liquid injection device according to any one of claims 1 to 10, wherein: The liquid injection device includes a third switch element corresponding to the liquid injection path on a one-to-one basis. The third switch element is provided on the liquid injection path to selectively open or close the liquid injection path.

12. The liquid injection device according to claim 11, wherein: The third switch element is an electrically controlled valve.

13. The liquid injection device according to any one of claims 1 to 12, wherein: The liquid injection device includes multiple fourth switch components and multiple liquid injection nozzles arranged on the secondary cup. Each liquid injection cavity is connected to one of the liquid injection nozzles. A fourth switch component is arranged between the liquid injection cavity and the corresponding liquid injection nozzle. The fourth switch component is used to selectively open or close the liquid flow path between the liquid injection cavity and the corresponding liquid injection nozzle.

14. The liquid injection device according to claim 13, wherein The fourth switch element is an electrically controlled valve.

15. The liquid injection device according to claim 13, wherein: The liquid injection nozzle is located at the bottom of the secondary cup.

16. The liquid injection device according to any one of claims 1 to 15, wherein: The first switch element is an electrically controlled valve.

17. The liquid injection device according to any one of claims 1 to 16, wherein: The liquid injection device includes an electrolyte pump, which is connected to the injection liquid path to pump the electrolyte.

18. A production line for producing batteries, comprising the liquid injection device according to any one of claims 1 to 17.

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